/* =========================================================
   一测 · 书卷 (Letterhead / Literary) Design System
   Inspired by builder-letters.vercel.app — parchment + ink,
   monochrome serif, generous whitespace, hairline rules.
   ========================================================= */

@import url("https://fonts.googleapis.com/css2?family=Noto+Serif+SC:wght@200;300;400;500;600;700&family=EB+Garamond:ital,wght@0,400;0,500;1,400;1,500&display=swap");

:root {
  /* Surfaces — warm parchment, layered by subtle luminance */
  --bg: #f2ede3;             /* aged paper */
  --bg-deep: #ece6d8;        /* slightly darker — for sidebar / inset surfaces */
  --surface: #fbf7ee;        /* clean page laid on aged paper */
  --surface-hover: #f4efe3;  /* hover-on-paper */
  --surface-strong: #ffffff; /* elevated white sheet — modals */
  --sidebar-bg: #ece6d8;

  /* Hairlines — pure ink, very low alpha. No more warm gold tints. */
  --line: rgba(26, 26, 26, 0.08);
  --line-strong: rgba(26, 26, 26, 0.16);
  --line-faint: rgba(26, 26, 26, 0.04);
  --rule: rgba(26, 26, 26, 0.18);  /* the hairline frontispiece rule */

  /* Ink scale — true black for headlines, warm greys for body */
  --text: #2a2723;          /* primary body */
  --text-strong: #1a1a1a;   /* headlines, emphasis */
  --muted: #7a736a;         /* secondary body, captions */
  --soft: #a39a8e;           /* timestamps, light captions */

  /* Legacy accent slots — kept as variables so existing rules don't break,
     but remapped to monochrome ink so nothing gold leaks through. */
  --gold: #2a2723;
  --gold-soft: #4a4540;
  --gold-deep: #1a1a1a;
  --jade: #6b6358;
  --rose: #8e6f6f;
  --ink: #1a1a1a;

  /* Depth — extremely soft on paper. Shadows are warm beige, not black. */
  --shadow-1: 0 1px 0 rgba(26, 24, 20, 0.04);
  --shadow-2: 0 6px 24px rgba(74, 66, 56, 0.06);
  --shadow-3: 0 24px 60px rgba(74, 66, 56, 0.12);
  --shadow-composer: 0 1px 0 rgba(255, 255, 255, 0.85) inset,
    0 6px 22px rgba(74, 66, 56, 0.06);

  /* Motion */
  --ease: cubic-bezier(0.22, 0.81, 0.34, 1);
  --t-fast: 140ms;
  --t-base: 200ms;
  --app-height: 100vh;
  --viewport-offset-top: 0px;
  --viewport-offset-right: 0px;
  --viewport-offset-bottom: 0px;
  --viewport-offset-left: 0px;

  /* Typography — Noto Serif SC carries the literary tone everywhere. */
  --font-serif:
    "Noto Serif SC", "Songti SC", "STSong", "Source Han Serif SC",
    "EB Garamond", Georgia, "Times New Roman", serif;
  --font-sans:
    "Noto Serif SC", "Songti SC", "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei UI", "Microsoft YaHei", system-ui, -apple-system,
    BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "JetBrains Mono", Menlo, Consolas, monospace;
  --font-italic: "EB Garamond", Georgia, "Times New Roman", serif;

  /* Letter-spacing presets — wider on headings is the signature of this style */
  --tracking-wide: 0.12em;     /* hero titles */
  --tracking-mid: 0.08em;      /* section titles */
  --tracking-soft: 0.04em;     /* body emphasis */
  --tracking-italic: 0.06em;   /* English meta lines */
}

* {
  box-sizing: border-box;
}

*::selection {
  background: rgba(26, 26, 26, 0.14);
  color: var(--text-strong);
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  min-width: 320px;
  color: var(--text);
  background: var(--bg);
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: 15px;
  line-height: 1.7;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  font-feature-settings: "palt", "kern";
  overflow: hidden;
}

button,
input,
select,
textarea {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
  transition: background var(--t-fast) var(--ease),
    color var(--t-fast) var(--ease),
    border-color var(--t-fast) var(--ease),
    transform var(--t-fast) var(--ease),
    box-shadow var(--t-fast) var(--ease);
}

button:focus-visible,
a:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
  outline: 1px solid rgba(26, 26, 26, 0.45);
  outline-offset: 2px;
}

::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  border: 2px solid transparent;
  border-radius: 999px;
  background: rgba(26, 26, 26, 0.14);
  background-clip: padding-box;
}
::-webkit-scrollbar-thumb:hover {
  background: rgba(26, 26, 26, 0.26);
  background-clip: padding-box;
}

/* =========================================================
   App shell — clean parchment surface
   ========================================================= */

.app-shell {
  min-height: 100vh;
  background: var(--bg);
}

.app-workspace {
  position: relative;
  display: grid;
  grid-template-columns: clamp(260px, 21vw, 300px) minmax(0, 1fr);
  height: var(--app-height);
  min-height: 0;
  color: var(--text);
  background: var(--bg);
  overflow: hidden;
  isolation: isolate;
}

/* Mobile-only chrome: hidden on desktop. */
.mobile-topbar,
.sidebar-backdrop {
  display: none;
}

/* =========================================================
   Sidebar
   ========================================================= */

.sidebar {
  position: relative;
  display: grid;
  grid-template-rows: auto auto minmax(0, 1fr) auto;
  gap: 18px;
  min-height: 0;
  height: 100%;
  border-right: 1px solid var(--line);
  padding: 28px 18px 16px;
  background: var(--sidebar-bg);
  overflow: hidden;
}

.sidebar::after {
  display: none; /* no warm gradient column anymore — pure hairline */
}

.sidebar-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  min-height: 48px;
  padding: 0 6px;
}

.sidebar-brand {
  align-items: center;
  min-width: 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
  border: 0;
  padding: 0;
  color: inherit;
  background: transparent;
  text-align: left;
}

.brand-title {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 19px;
  letter-spacing: var(--tracking-wide);
  color: var(--text-strong);
  line-height: 1.15;
}

.brand-subtitle {
  margin: 4px 0 0;
  color: var(--muted);
  font-family: var(--font-italic);
  font-style: italic;
  font-size: 11px;
  font-weight: 400;
  letter-spacing: var(--tracking-italic);
}

.brand-mark {
  display: none;
}

.icon-button {
  display: grid;
  width: 30px;
  height: 30px;
  place-items: center;
  border: 0;
  border-radius: 6px;
  color: var(--muted);
  background: transparent;
  font-size: 15px;
  line-height: 1;
}

.icon-button:hover {
  color: var(--text-strong);
  background: rgba(26, 26, 26, 0.05);
}

.side-actions {
  display: grid;
  gap: 1px;
}

.side-action,
.session-item {
  position: relative;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  gap: 12px;
  width: 100%;
  border: 0;
  border-radius: 4px;
  padding: 10px 10px;
  color: var(--muted);
  background: transparent;
  text-align: left;
  font-family: var(--font-serif);
  font-size: 14px;
  font-weight: 400;
  letter-spacing: 0.04em;
  transition: background var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}

.side-action:hover,
.session-item:hover {
  color: var(--text-strong);
  background: rgba(42, 39, 35, 0.035);
}

.side-action.active {
  color: var(--text-strong);
  background: rgba(42, 39, 35, 0.08);
  font-weight: 500;
}

.side-icon {
  display: grid;
  width: 24px;
  height: 24px;
  place-items: center;
  border-radius: 0;
  color: var(--muted);
  background: transparent;
  border: 0;
  font-size: 13px;
  font-weight: 400;
  font-family: var(--font-italic);
  font-style: italic;
  letter-spacing: 0;
}

.side-action.active .side-icon {
  color: var(--text-strong);
  background: transparent;
  border: 0;
}

.side-icon.image-icon {
  background: transparent;
}

.side-icon img {
  width: 15px;
  height: 15px;
  object-fit: contain;
  opacity: 0.55;
  filter: grayscale(1) contrast(1.1);
  transition: opacity var(--t-fast) var(--ease);
}

.side-action:hover .side-icon img,
.side-action.active .side-icon img {
  opacity: 1;
}

.side-label {
  font-weight: inherit;
  letter-spacing: inherit;
}

/* Session list */

.session-panel {
  min-height: 0;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  gap: 12px;
  margin-top: 6px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.session-title {
  padding: 0 10px;
  color: var(--soft);
  font-family: var(--font-italic);
  font-style: italic;
  font-size: 11px;
  font-weight: 400;
  letter-spacing: var(--tracking-italic);
  text-transform: none;
}

.session-list {
  min-height: 0;
  overflow-y: auto;
  display: grid;
  align-content: start;
  gap: 0;
  padding-right: 2px;
}

.session-row {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  border-radius: 4px;
  transition: background var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}

.session-row:hover {
  background: rgba(42, 39, 35, 0.035);
}

.session-row.active {
  background: rgba(42, 39, 35, 0.08);
}

.session-row.active .session-name {
  color: var(--text-strong);
  font-weight: 500;
}

.session-row .session-item {
  grid-template-columns: minmax(0, 1fr);
  gap: 2px;
  min-width: 0;
  padding: 8px 10px;
  font-family: var(--font-serif);
  font-size: 13px;
  letter-spacing: 0.03em;
}

.session-row:hover .session-item,
.session-row.active .session-item {
  background: transparent;
}

.session-row:hover .session-name {
  color: var(--text-strong);
}

.session-name {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 13px;
  color: var(--muted);
  transition: color var(--t-fast) var(--ease);
}

.session-time {
  color: var(--soft);
  font-family: var(--font-italic);
  font-size: 10.5px;
  font-style: italic;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}

.session-empty {
  padding: 16px 10px;
  color: var(--soft);
  font-family: var(--font-italic);
  font-style: italic;
  font-size: 12px;
}

.session-more {
  display: grid;
  width: 24px;
  height: 24px;
  margin-right: 4px;
  place-items: center;
  border: 0;
  border-radius: 4px;
  color: var(--soft);
  background: transparent;
  opacity: 0;
  font-size: 16px;
  line-height: 0;
  transition: opacity var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}

.session-row:hover .session-more,
.session-row.active .session-more,
.session-more:focus {
  opacity: 1;
}

.session-more:hover {
  color: var(--text-strong);
  background: rgba(26, 26, 26, 0.05);
}

.session-menu {
  position: absolute;
  top: 36px;
  right: 6px;
  z-index: 40;
  display: grid;
  min-width: 132px;
  border: 1px solid var(--line-strong);
  border-radius: 4px;
  padding: 4px;
  background: var(--surface-strong);
  box-shadow: var(--shadow-3);
}

.session-menu button {
  border: 0;
  border-radius: 3px;
  padding: 8px 12px;
  color: var(--text);
  background: transparent;
  text-align: left;
  font-family: var(--font-serif);
  font-size: 13px;
  letter-spacing: 0.04em;
}

.session-menu button:hover {
  background: rgba(26, 26, 26, 0.06);
  color: var(--text-strong);
}

.session-menu .danger {
  color: #8a3d3d;
}

.session-menu .danger:hover {
  background: rgba(138, 61, 61, 0.08);
  color: #6e2f2f;
}

/* Inline rename — replaces window.prompt with an editable row */

.session-row.is-editing {
  background: rgba(42, 39, 35, 0.05);
  padding: 0 4px;
}

.session-edit {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto auto;
  align-items: center;
  gap: 4px;
  width: 100%;
  padding: 6px 4px 6px 8px;
}

.session-edit-input {
  min-width: 0;
  width: 100%;
  border: 0;
  border-bottom: 1px solid var(--text-strong);
  border-radius: 0;
  padding: 4px 0;
  background: transparent;
  color: var(--text-strong);
  font-family: var(--font-serif);
  font-size: 13.5px;
  letter-spacing: 0.04em;
  outline: none;
}

.session-edit-input::selection {
  background: rgba(26, 26, 26, 0.18);
}

.session-edit-icon {
  display: grid;
  width: 26px;
  height: 26px;
  place-items: center;
  border: 0;
  border-radius: 4px;
  padding: 0;
  background: transparent;
  color: var(--text-strong);
  cursor: pointer;
  transition: background var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}

.session-edit-icon:hover {
  background: rgba(42, 39, 35, 0.1);
}

.session-edit-cancel {
  color: var(--muted);
}

.session-edit-cancel:hover {
  color: var(--text-strong);
}

/* Auth panel — a quiet signature line at the foot of the page */

.auth-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 10px;
  padding: 16px 10px 4px;
  border-top: 1px solid var(--line);
}

.auth-panel strong,
.auth-panel span {
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.auth-panel strong {
  color: var(--text-strong);
  font-family: var(--font-serif);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.06em;
}

.auth-panel span {
  margin-top: 2px;
  color: var(--soft);
  font-family: var(--font-italic);
  font-style: italic;
  font-size: 11px;
}

/* =========================================================
   Sidebar collapsed state
   ========================================================= */

.content-shell {
  position: relative;
  min-width: 0;
  min-height: 0;
  height: var(--app-height);
  overflow: auto;
  padding: 0;
  background: transparent;
}

.sidebar-collapsed {
  grid-template-columns: 72px minmax(0, 1fr);
}

.sidebar-collapsed .sidebar {
  padding: 22px 10px 14px;
}

.sidebar-collapsed .sidebar-copy,
.sidebar-collapsed .side-label,
.sidebar-collapsed .session-panel,
.sidebar-collapsed .auth-panel {
  display: none;
}

.sidebar-collapsed .sidebar-head,
.sidebar-collapsed .side-action {
  justify-content: center;
}

.sidebar-collapsed .side-action {
  grid-template-columns: auto;
  padding: 9px;
}

/* =========================================================
   Chat page
   ========================================================= */

.chat-page {
  position: relative;
  height: var(--app-height);
  min-height: 0;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto;
  gap: 0;
  overflow: hidden;
}

.chat-page.is-empty {
  grid-template-rows: auto minmax(0, 1fr);
}

.chat-empty-wrap {
  min-height: 0;
  display: grid;
  align-content: center;
  justify-items: center;
  gap: 28px;
  padding: 24px clamp(16px, 4vw, 48px) 64px;
  width: 100%;
}

.chat-topbar {
  position: relative;
  display: flex;
  align-items: center;
  min-height: 60px;
  padding: 22px clamp(20px, 3.5vw, 48px) 16px;
}

.chat-topbar::after {
  content: "";
  position: absolute;
  left: clamp(20px, 3.5vw, 48px);
  right: clamp(20px, 3.5vw, 48px);
  bottom: 0;
  height: 1px;
  background: var(--line);
}

.chat-topbar h2 {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 16px;
  letter-spacing: var(--tracking-mid);
  color: var(--text-strong);
}

.chat-topbar p {
  margin: 4px 0 0;
  color: var(--muted);
  font-family: var(--font-italic);
  font-style: italic;
  font-size: 12px;
  letter-spacing: var(--tracking-italic);
}

/* Messages */

.chat-messages {
  min-height: 0;
  overflow-y: auto;
  display: grid;
  align-content: start;
  gap: 0;
  padding: 28px clamp(16px, 4vw, 56px) 32px;
  scroll-behavior: smooth;
}

/* Frontispiece — book-opening composition: thin rule · serif title · italic subtitle */
.chat-empty {
  align-self: center;
  justify-self: center;
  max-width: 720px;
  padding: 12px 16px 0;
  text-align: center;
}

.chat-empty::before {
  content: "";
  display: block;
  width: 36px;
  height: 1px;
  margin: 0 auto 38px;
  background: var(--rule);
}

.chat-empty h1 {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(28px, 3.4vw, 36px);
  letter-spacing: var(--tracking-wide);
  color: var(--text-strong);
  line-height: 1.5;
  -webkit-text-fill-color: var(--text-strong); /* reset previous gradient */
}

.chat-empty p {
  margin: 22px auto 0;
  max-width: 520px;
  color: var(--muted);
  font-family: var(--font-serif);
  font-weight: 300;
  line-height: 1.95;
  font-size: 14px;
  letter-spacing: var(--tracking-soft);
}

.chat-empty p + p {
  margin-top: 14px;
  font-family: var(--font-italic);
  font-style: italic;
  letter-spacing: var(--tracking-italic);
  color: var(--soft);
}

.chat-message {
  display: flex;
  width: min(820px, 100%);
  margin: 0 auto;
  padding: 12px 0;
  animation: message-enter 360ms var(--ease) both;
  animation-delay: var(--enter-delay, 0ms);
}

@keyframes message-enter {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.chat-message.user {
  justify-content: flex-end;
}

.message-bubble {
  max-width: min(700px, 84%);
  border: 0;
  border-radius: 0;
  padding: 4px 0;
  background: transparent;
  line-height: 1.85;
  color: var(--text);
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: 15px;
  letter-spacing: 0.01em;
  word-wrap: break-word;
}

.chat-message.user .message-bubble {
  background: var(--surface);
  border: 1px solid var(--line);
  color: var(--text-strong);
  border-radius: 2px;
  padding: 12px 16px;
  box-shadow: var(--shadow-1);
  font-weight: 500;
  letter-spacing: 0.02em;
}

.chat-message.assistant .message-bubble {
  padding-left: 0;
  padding-right: 0;
}

/* Thinking state — light beam sweeps across the text */
.chat-message.is-thinking .message-bubble {
  padding-left: 0;
  padding-right: 0;
}

.thinking-line {
  margin: 0;
  font-family: var(--font-serif);
  font-style: normal;
  font-size: 14px;
  letter-spacing: 0.04em;
  background-image: linear-gradient(
    100deg,
    rgba(122, 115, 106, 0.45) 0%,
    rgba(122, 115, 106, 0.45) 38%,
    rgba(42, 39, 35, 0.85) 46%,
    rgba(26, 26, 26, 1) 50%,
    rgba(42, 39, 35, 0.85) 54%,
    rgba(122, 115, 106, 0.45) 62%,
    rgba(122, 115, 106, 0.45) 100%
  );
  background-size: 250% 100%;
  background-position: 120% 0;
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  animation: thinking-shimmer 2.2s cubic-bezier(0.4, 0, 0.2, 1) infinite;
}

@keyframes thinking-shimmer {
  0% {
    background-position: 120% 0;
  }
  100% {
    background-position: -120% 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .thinking-line {
    animation: none;
    color: var(--muted);
    -webkit-text-fill-color: var(--muted);
  }
  .chat-message {
    animation: none;
  }
  .stream-caret {
    animation: none;
    opacity: 0.6;
  }
}

/* Streaming state — incremental text with blinking caret */
.message-stream {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: 15px;
  line-height: 1.85;
  letter-spacing: 0.01em;
  color: var(--text);
  white-space: pre-wrap;
  word-break: break-word;
}

.stream-caret {
  display: inline-block;
  width: 2px;
  height: 1em;
  margin-left: 2px;
  vertical-align: -0.12em;
  background: var(--text-strong);
  border-radius: 0;
  box-shadow: none;
  animation: stream-caret-blink 1s steps(2, end) infinite;
}

@keyframes stream-caret-blink {
  0%, 49% { opacity: 1; }
  50%, 100% { opacity: 0; }
}

/* Thinking panel — a folded margin note in the manuscript */
.thinking-panel {
  margin: 6px 0 18px;
  border-radius: 0;
  background: transparent;
  border: 0;
  border-left: 1px solid var(--line-strong);
  box-shadow: none;
  overflow: hidden;
  padding-left: 14px;
  transition: border-color 0.4s ease;
}

.thinking-panel.is-active {
  border-left-color: var(--text-strong);
}

.thinking-panel__header {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 4px 0 6px;
  background: transparent;
  border: 0;
  color: var(--muted);
  font-family: var(--font-italic);
  font-style: italic;
  font-size: 12.5px;
  letter-spacing: var(--tracking-italic);
  text-align: left;
  cursor: pointer;
  transition: color 0.2s ease;
}

.thinking-panel__header:hover {
  color: var(--text-strong);
  background: transparent;
}

.thinking-panel__header:focus-visible {
  outline: 1px dashed rgba(26, 26, 26, 0.45);
  outline-offset: 2px;
}

.thinking-panel__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  color: var(--text-strong);
  background: transparent;
  flex: none;
}

.thinking-panel__icon::before {
  content: "";
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: currentColor;
  opacity: 0.55;
}

.thinking-panel.is-active .thinking-panel__icon {
  animation: thinking-icon-pulse 2.4s ease-in-out infinite;
}

@keyframes thinking-icon-pulse {
  0%, 100% {
    transform: scale(1);
    opacity: 1;
  }
  50% {
    transform: scale(1.4);
    opacity: 0.45;
  }
}

.thinking-panel__label {
  flex: 1;
  min-width: 0;
  color: var(--muted);
  font-family: var(--font-italic);
  font-style: italic;
}

.thinking-panel__label.is-shimmer {
  background-image: linear-gradient(
    100deg,
    rgba(122, 115, 106, 0.55) 0%,
    rgba(122, 115, 106, 0.55) 38%,
    rgba(42, 39, 35, 0.9) 46%,
    rgba(26, 26, 26, 1) 50%,
    rgba(42, 39, 35, 0.9) 54%,
    rgba(122, 115, 106, 0.55) 62%,
    rgba(122, 115, 106, 0.55) 100%
  );
  background-size: 250% 100%;
  background-position: 120% 0;
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  animation: thinking-shimmer 2.2s cubic-bezier(0.4, 0, 0.2, 1) infinite;
}

.thinking-panel__chevron {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 16px;
  height: 16px;
  color: var(--soft);
  transition: transform 0.3s ease, color 0.2s ease;
}

.thinking-panel__header:hover .thinking-panel__chevron {
  color: var(--text-strong);
}

.thinking-panel.is-collapsed .thinking-panel__chevron {
  transform: rotate(-90deg);
}

.thinking-panel.is-expanded .thinking-panel__chevron {
  transform: rotate(0deg);
}

.thinking-panel__body {
  display: grid;
  grid-template-rows: 1fr;
  transition: grid-template-rows 0.32s cubic-bezier(0.4, 0, 0.2, 1);
}

.thinking-panel.is-collapsed .thinking-panel__body {
  grid-template-rows: 0fr;
}

.thinking-panel__inner {
  overflow: hidden;
  min-height: 0;
}

.thinking-panel__text {
  position: relative;
  max-height: 260px;
  overflow-y: auto;
  padding: 8px 0 4px;
  margin-top: 2px;
  font-family: var(--font-serif);
  font-weight: 300;
  font-size: 13px;
  line-height: 1.8;
  color: var(--muted);
  white-space: pre-wrap;
  word-break: break-word;
  border-top: 0;
  scrollbar-width: thin;
  scrollbar-color: rgba(26, 26, 26, 0.18) transparent;
}

.thinking-panel__text::-webkit-scrollbar {
  width: 4px;
}

.thinking-panel__text::-webkit-scrollbar-thumb {
  background: rgba(26, 26, 26, 0.18);
  border-radius: 2px;
}

@media (prefers-reduced-motion: reduce) {
  .thinking-panel__body {
    transition: none;
  }
  .thinking-panel__chevron {
    transition: none;
  }
  .thinking-panel.is-active .thinking-panel__icon {
    animation: none;
  }
  .thinking-panel__label.is-shimmer {
    animation: none;
    color: var(--muted);
    -webkit-text-fill-color: var(--muted);
  }
}

.message-error {
  margin: 0;
  padding: 10px 14px;
  font-family: var(--font-italic);
  font-style: italic;
  font-size: 13px;
  color: #6e2f2f;
  background: rgba(138, 61, 61, 0.05);
  border: 0;
  border-left: 2px solid rgba(138, 61, 61, 0.4);
  border-radius: 0;
}

.message-references {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 12px;
  padding-bottom: 12px;
  border-bottom: 1px dashed var(--line);
}

.message-references span {
  max-width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  border: 0;
  border-radius: 0;
  padding: 0;
  color: var(--soft);
  background: transparent;
  font-family: var(--font-italic);
  font-style: italic;
  font-size: 11.5px;
  letter-spacing: var(--tracking-italic);
}

.message-references span:not(:last-child)::after {
  content: " · ";
  color: var(--soft);
  margin-left: 6px;
}

/* Scroll-to-bottom floating button */

.chat-scroll-bottom {
  position: absolute;
  left: 50%;
  bottom: 124px;
  z-index: 18;
  display: grid;
  width: 32px;
  height: 32px;
  place-items: center;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  color: var(--text-strong);
  background: var(--surface);
  box-shadow: var(--shadow-2);
  transform: translateX(-50%);
  font-size: 14px;
  font-weight: 500;
  line-height: 1;
}

.chat-scroll-bottom:hover {
  color: var(--text-strong);
  border-color: var(--text-strong);
  background: var(--surface-hover);
  transform: translate(-50%, -2px);
}

.chat-scroll-bottom[hidden] {
  display: none;
}

/* =========================================================
   Composer
   ========================================================= */

.chat-composer {
  position: relative;
  width: min(780px, calc(100% - 32px));
  margin: 0 auto 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  border: 1px solid var(--line-strong);
  border-radius: 2px;
  padding: 14px 14px 12px 18px;
  background: var(--surface);
  box-shadow: var(--shadow-composer);
  flex-shrink: 0;
  transition: border-color var(--t-base) var(--ease),
    box-shadow var(--t-base) var(--ease);
}

/* When centered in empty state — slightly tighter, no bottom margin */
.chat-empty-wrap .chat-composer {
  width: min(680px, 100%);
  margin: 0;
}

.chat-composer:focus-within {
  border-color: rgba(74, 69, 64, 0.45);
  box-shadow:
    0 0 0 3px rgba(74, 69, 64, 0.06),
    var(--shadow-composer);
}

.composer-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: end;
  gap: 12px;
}

.chat-composer textarea {
  min-height: 28px;
  max-height: 180px;
  border: 0;
  padding: 6px 0 6px;
  color: var(--text-strong);
  background: transparent;
  outline: none;
  line-height: 1.7;
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: 15px;
  letter-spacing: 0.01em;
  resize: none;
  overflow-y: auto;
}

.chat-composer textarea::placeholder {
  color: var(--soft);
  font-family: var(--font-italic);
  font-style: italic;
  letter-spacing: var(--tracking-italic);
}

.chat-composer .chat-send-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  align-self: end;
  min-width: auto;
  width: auto;
  height: 32px;
  border: 0;
  border-radius: 0;
  padding: 0 4px 4px;
  overflow: hidden;
  color: var(--text-strong);
  background: transparent;
  box-shadow: none;
  line-height: 1;
  font-family: var(--font-serif);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: var(--tracking-mid);
  transition: color var(--t-fast) var(--ease), opacity var(--t-fast) var(--ease);
}

.chat-composer .chat-send-button::before {
  content: "";
  display: inline-block;
  width: 18px;
  height: 1px;
  margin-right: 8px;
  background: currentColor;
  vertical-align: middle;
  transition: width var(--t-base) var(--ease);
}

.chat-composer .chat-send-button:hover {
  background: transparent;
  transform: none;
  box-shadow: none;
  color: var(--text-strong);
}

.chat-composer .chat-send-button:hover::before {
  width: 28px;
}

.chat-composer .chat-send-button:active {
  transform: none;
  box-shadow: none;
  opacity: 0.7;
}

.chat-composer .chat-send-button:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.chat-composer .chat-send-button:disabled::before {
  width: 12px;
}

/* =========================================================
   View Transitions — composer morph & cross-fade tuning
   ========================================================= */

@media (prefers-reduced-motion: no-preference) {
  ::view-transition-old(root),
  ::view-transition-new(root) {
    animation-duration: 320ms;
    animation-timing-function: cubic-bezier(0.22, 0.81, 0.34, 1);
  }

  ::view-transition-old(chat-composer),
  ::view-transition-new(chat-composer) {
    animation-duration: 480ms;
    animation-timing-function: cubic-bezier(0.22, 0.81, 0.34, 1);
  }
}

/* Mention picker */

.mention-list {
  position: absolute;
  left: 50%;
  bottom: calc(100% + 12px);
  transform: translateX(-50%);
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto;
  gap: 10px;
  width: min(100%, 720px);
  max-height: 320px;
  border: 1px solid var(--line-strong);
  border-radius: 2px;
  padding: 14px 10px 12px;
  background: var(--surface-strong);
  box-shadow: var(--shadow-3);
}

.mention-list[hidden],
.selected-mentions[hidden] {
  display: none;
}

.mention-panel-title {
  padding: 0 14px;
  color: var(--muted);
  font-family: var(--font-italic);
  font-style: italic;
  font-size: 12px;
  font-weight: 400;
  letter-spacing: var(--tracking-italic);
}

.mention-options {
  min-height: 0;
  overflow-y: auto;
  display: grid;
  gap: 0;
}

.mention-option {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  gap: 14px;
  width: 100%;
  border: 0;
  border-radius: 0;
  padding: 12px 14px;
  color: var(--text);
  background: transparent;
  text-align: left;
  font-family: var(--font-serif);
}

.mention-option[hidden],
.mention-empty[hidden] {
  display: none;
}

.mention-option:hover {
  background: rgba(26, 26, 26, 0.04);
}

.mention-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 48px;
  height: 24px;
  border: 1px solid var(--line-strong);
  border-radius: 0;
  padding: 0 9px;
  color: var(--text-strong);
  background: transparent;
  font-family: var(--font-italic);
  font-style: italic;
  font-size: 11.5px;
  font-weight: 400;
  letter-spacing: var(--tracking-italic);
}

.mention-main {
  min-width: 0;
  display: grid;
  gap: 2px;
}

.mention-option strong,
.mention-option small {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.mention-option strong {
  font-weight: 500;
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--text-strong);
}

.mention-option small,
.mention-empty {
  color: var(--muted);
  font-family: var(--font-italic);
  font-style: italic;
  font-size: 12px;
  letter-spacing: var(--tracking-italic);
}

.mention-empty {
  padding: 14px;
}

.selected-mentions {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 4px 4px 0 0;
}

.mention-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  max-width: 100%;
  border: 1px solid var(--line-strong);
  border-radius: 0;
  padding: 4px 8px 4px 10px;
  color: var(--text-strong);
  background: transparent;
  font-family: var(--font-serif);
  font-size: 12px;
  letter-spacing: 0.04em;
}

.mention-chip button {
  display: grid;
  width: 16px;
  height: 16px;
  place-items: center;
  border: 0;
  border-radius: 0;
  color: var(--muted);
  background: transparent;
  font-size: 14px;
  line-height: 1;
}

.mention-chip button:hover {
  color: var(--text-strong);
  background: transparent;
}

/* =========================================================
   Reading typography (markdown content from AI)
   ========================================================= */

.reading {
  color: var(--text);
  font-family: var(--font-serif);
  font-weight: 400;
  line-height: 1.95;
  font-size: 15px;
  letter-spacing: 0.01em;
}

.reading-pending {
  display: grid;
  min-height: 120px;
  place-items: center;
  color: var(--muted);
  font-family: var(--font-italic);
  font-style: italic;
  text-align: center;
}

.reading h2,
.reading h3,
.reading h4 {
  margin: 32px 0 14px;
  color: var(--text-strong);
  font-family: var(--font-serif);
  font-weight: 600;
  letter-spacing: var(--tracking-mid);
  line-height: 1.4;
}

.reading h2 {
  font-size: 19px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.reading h3 {
  font-size: 16px;
}

.reading h4 {
  font-size: 14px;
  letter-spacing: var(--tracking-soft);
}

.reading p {
  margin: 14px 0;
}

.reading strong {
  color: var(--text-strong);
  font-weight: 600;
  letter-spacing: 0.02em;
}

.reading em {
  color: var(--text-strong);
  font-family: var(--font-italic);
  font-style: italic;
  font-weight: 500;
  letter-spacing: var(--tracking-italic);
}

.reading ul,
.reading ol {
  display: grid;
  gap: 8px;
  margin: 14px 0 18px;
  padding-left: 22px;
}

.reading li::marker {
  color: var(--text-strong);
}

.reading ul li::marker {
  content: "·  ";
  font-weight: 700;
}

.reading blockquote {
  margin: 22px 0;
  border-left: 1px solid var(--text-strong);
  padding: 4px 0 4px 18px;
  color: var(--muted);
  background: transparent;
  border-radius: 0;
  font-family: var(--font-italic);
  font-style: italic;
  font-size: 14px;
  letter-spacing: var(--tracking-italic);
}

.reading hr {
  border: 0;
  border-top: 1px solid var(--rule);
  margin: 32px auto;
  width: 36px;
}

.reading code {
  border: 0;
  border-bottom: 1px dotted var(--text-strong);
  border-radius: 0;
  padding: 0 2px;
  background: transparent;
  color: var(--text-strong);
  font-family: var(--font-mono);
  font-size: 0.88em;
}

.reading h2:first-child,
.reading h3:first-child,
.reading p:first-child {
  margin-top: 0;
  padding-top: 0;
  border-top: 0;
}

.reading-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 28px;
  border-top: 1px solid var(--line);
  padding-top: 18px;
}

.reading-status {
  color: var(--muted);
  font-family: var(--font-italic);
  font-style: italic;
  font-size: 12.5px;
  letter-spacing: var(--tracking-italic);
}

.stream-cursor {
  display: inline-block;
  width: 2px;
  height: 1.1em;
  margin-left: 3px;
  vertical-align: -0.18em;
  border-radius: 0;
  background: var(--text-strong);
  animation: cursor-blink 1s steps(2, start) infinite;
}

@keyframes cursor-blink {
  to { opacity: 0; }
}

@keyframes card-enter {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* =========================================================
   Generic layout primitives (used in tarot/bazi/history)
   ========================================================= */

.layout {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  padding: 28px 0 48px;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 0 16px;
  border-bottom: 1px solid var(--line);
  background: var(--bg);
  backdrop-filter: blur(8px);
}

.nav {
  display: flex;
  gap: 18px;
  overflow-x: auto;
  padding-bottom: 2px;
}

.nav-button {
  flex: 0 0 auto;
  border: 0;
  border-radius: 0;
  padding: 6px 0;
  color: var(--muted);
  background: transparent;
  font-family: var(--font-serif);
  font-size: 13.5px;
  font-weight: 400;
  letter-spacing: var(--tracking-soft);
  position: relative;
  transition: color var(--t-fast) var(--ease);
}

.nav-button:hover {
  color: var(--text-strong);
  background: transparent;
}

.nav-button.active {
  color: var(--text-strong);
  font-weight: 500;
  background: transparent;
}

.nav-button.active::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -2px;
  height: 1px;
  background: var(--text-strong);
}

.hero {
  min-height: clamp(380px, 54vh, 580px);
  display: grid;
  align-content: center;
  justify-items: center;
  padding: 56px 0 38px;
  text-align: center;
}

.hero::before {
  content: "";
  display: block;
  width: 36px;
  height: 1px;
  margin: 0 auto 36px;
  background: var(--rule);
}

.hero h1 {
  margin: 0;
  max-width: 760px;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(28px, 3.4vw, 40px);
  line-height: 1.45;
  letter-spacing: var(--tracking-wide);
  color: var(--text-strong);
}

.hero p {
  max-width: 540px;
  margin: 22px 0 0;
  color: var(--muted);
  font-family: var(--font-serif);
  font-weight: 300;
  font-size: 14px;
  line-height: 1.95;
  letter-spacing: var(--tracking-soft);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 24px;
  margin-top: 32px;
}

.button {
  border: 0;
  border-radius: 0;
  padding: 8px 0;
  color: var(--text-strong);
  background: transparent;
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: 13px;
  letter-spacing: var(--tracking-mid);
  position: relative;
  transition: color var(--t-fast) var(--ease), opacity var(--t-fast) var(--ease);
}

.button::before {
  content: "";
  display: inline-block;
  width: 18px;
  height: 1px;
  margin-right: 10px;
  background: currentColor;
  vertical-align: middle;
  transition: width var(--t-base) var(--ease);
}

.button:hover {
  background: transparent;
  border: 0;
  color: var(--text-strong);
}

.button:hover::before {
  width: 28px;
}

.button.primary {
  border: 0;
  color: var(--text-strong);
  background: transparent;
  box-shadow: none;
  font-weight: 600;
}

.button.primary:hover {
  background: transparent;
}

.button:disabled {
  cursor: not-allowed;
  opacity: 0.4;
}

.button:disabled::before {
  width: 12px;
}

.button.ghost {
  background: transparent;
  border: 0;
  color: var(--muted);
}

.button.ghost:hover {
  color: var(--text-strong);
  background: transparent;
}

.button.compact {
  min-height: auto;
  padding: 6px 0;
  font-size: 12px;
}

.section {
  width: min(1180px, calc(100% - 32px));
  margin: 56px auto 0;
}

.section-header {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 28px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.section-title {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 18px;
  letter-spacing: var(--tracking-mid);
  color: var(--text-strong);
}

.section-note {
  margin: 0;
  color: var(--muted);
  font-family: var(--font-italic);
  font-style: italic;
  font-size: 13px;
  letter-spacing: var(--tracking-italic);
}

.module-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.module-card {
  min-height: 168px;
  border: 0;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  border-radius: 0;
  padding: 28px 24px;
  color: inherit;
  background: transparent;
  box-shadow: none;
  text-align: left;
  transition: background var(--t-base) var(--ease);
}

.module-card:hover {
  transform: none;
  border-color: var(--line);
  box-shadow: none;
  background: var(--surface);
}

.module-icon {
  width: 28px;
  height: 28px;
  object-fit: contain;
  opacity: 0.6;
  filter: grayscale(1) contrast(1.1);
  transition: opacity var(--t-base) var(--ease);
}

.module-card:hover .module-icon {
  opacity: 1;
}

.module-card h3 {
  margin: 22px 0 10px;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 15px;
  letter-spacing: var(--tracking-mid);
  color: var(--text-strong);
}

.module-card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.75;
  font-size: 13px;
  letter-spacing: var(--tracking-soft);
}

/* =========================================================
   Workbench (tarot / bazi)
   ========================================================= */

.workbench {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  align-items: start;
  margin-top: 28px;
}

.panel,
.result-panel {
  border: 1px solid var(--line-strong);
  border-radius: 2px;
  background: var(--surface);
  box-shadow: none;
}

.panel {
  padding: 28px 26px;
}

.result-panel {
  min-width: 0;
  min-height: min(520px, calc(100vh - 160px));
  padding: 32px 32px;
}

/* ───── Form collapse / summary strip ───── */
.form-panel {
  position: relative;
}

.form-panel .form-stack {
  max-width: 640px;
  margin: 0 auto;
  width: 100%;
}

.form-summary {
  display: none;
  align-items: center;
  gap: 20px;
  padding: 16px 24px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: var(--surface);
  color: var(--ink);
  cursor: pointer;
  font-family: inherit;
  text-align: left;
  width: 100%;
  transition:
    background var(--t-base) var(--ease),
    border-color var(--t-base) var(--ease),
    color var(--t-base) var(--ease);
}

.form-summary:hover {
  background: var(--surface-warm, rgba(74, 69, 64, 0.04));
  border-color: var(--line-strong);
}

.form-summary-label {
  flex-shrink: 0;
  font-style: italic;
  color: var(--ink-soft);
  font-size: 12px;
  letter-spacing: 0.28em;
  padding-right: 18px;
  border-right: 1px solid var(--line);
  text-transform: none;
}

.form-summary-text {
  flex: 1;
  min-width: 0;
  font-size: 14px;
  color: var(--ink-strong);
  letter-spacing: 0.04em;
  line-height: 1.5;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.form-summary-action {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  font-style: italic;
  color: var(--ink-soft);
  letter-spacing: 0.18em;
  padding-left: 14px;
  border-left: 1px solid var(--line);
  transition: color var(--t-base) var(--ease);
}

.form-summary:hover .form-summary-action {
  color: var(--ink-strong);
}

.form-summary-action svg {
  opacity: 0.7;
  transition: opacity var(--t-base) var(--ease);
}

.form-summary:hover .form-summary-action svg {
  opacity: 1;
}

.workbench.is-form-collapsed .form-panel {
  display: none;
}

.workbench.is-form-collapsed .form-summary {
  display: flex;
}

.form-stack {
  display: grid;
  gap: 18px;
}

.field {
  display: grid;
  gap: 8px;
}

.field label {
  color: var(--muted);
  font-family: var(--font-italic);
  font-style: italic;
  font-size: 12px;
  font-weight: 400;
  letter-spacing: var(--tracking-italic);
}

.field input,
.field select,
.field textarea {
  width: 100%;
  border: 0;
  border-bottom: 1px solid var(--line-strong);
  border-radius: 0;
  padding: 8px 0;
  color: var(--text-strong);
  background: transparent;
  outline: none;
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: 14px;
  letter-spacing: 0.02em;
  transition: border-color var(--t-fast) var(--ease);
}

.field textarea {
  min-height: 120px;
  resize: vertical;
  line-height: 1.8;
  border: 1px solid var(--line-strong);
  border-radius: 0;
  padding: 12px 14px;
}

.field input:focus,
.field select:focus,
.field textarea:focus {
  border-color: rgba(74, 69, 64, 0.55);
  background: transparent;
}

.field textarea:focus {
  box-shadow: 0 0 0 3px rgba(74, 69, 64, 0.05);
}

.picker-control {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 42px;
  align-items: center;
  border: 0;
  border-bottom: 1px solid var(--line-strong);
  border-radius: 0;
  background: transparent;
  cursor: pointer;
  transition: border-color var(--t-fast) var(--ease);
}

.picker-control:hover,
.picker-control:focus-within {
  border-bottom-color: rgba(74, 69, 64, 0.55);
  background: transparent;
}

.picker-control input {
  border: 0;
  background: transparent;
  cursor: pointer;
  caret-color: transparent;
  user-select: none;
  padding: 8px 0;
}

.picker-control input:focus {
  border-color: transparent;
}

.picker-button {
  width: 28px;
  height: 28px;
  justify-self: center;
  border: 0;
  border-radius: 0;
  color: var(--text-strong);
  background: transparent;
  font-family: var(--font-italic);
  font-style: italic;
  font-size: 12px;
  font-weight: 400;
  letter-spacing: var(--tracking-italic);
}

.picker-button:hover {
  background: transparent;
  text-decoration: underline;
  text-underline-offset: 4px;
}

.custom-picker {
  position: absolute;
  left: 0;
  top: calc(100% + 8px);
  z-index: 30;
  width: min(340px, calc(100vw - 36px));
  border: 1px solid var(--line-strong);
  border-radius: 2px;
  padding: 18px;
  color: var(--text);
  background: var(--surface-strong);
  box-shadow: var(--shadow-3);
}

.time-popover {
  width: min(300px, calc(100vw - 36px));
}

.picker-head,
.picker-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.picker-head {
  margin-bottom: 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

.picker-head strong {
  color: var(--text-strong);
  font-size: 14px;
  font-family: var(--font-serif);
  font-weight: 600;
  letter-spacing: var(--tracking-mid);
}

.date-jump {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  gap: 8px;
  flex: 1;
}

.date-jump select {
  width: 100%;
  border: 0;
  border-bottom: 1px solid var(--line-strong);
  border-radius: 0;
  padding: 6px 4px;
  color: var(--text-strong);
  background: transparent;
  outline: none;
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: 13px;
}

.date-jump select:focus {
  border-color: rgba(74, 69, 64, 0.55);
}

.picker-nav,
.text-action {
  border: 0;
  border-radius: 0;
  color: var(--text-strong);
  background: transparent;
  font-family: var(--font-italic);
  font-style: italic;
}

.picker-nav {
  width: 28px;
  height: 28px;
  font-size: 16px;
  line-height: 1;
}

.text-action {
  padding: 6px 0;
  font-size: 12px;
  font-weight: 400;
  letter-spacing: var(--tracking-italic);
}

.picker-nav:hover,
.text-action:hover {
  background: transparent;
  text-decoration: underline;
  text-underline-offset: 4px;
}

.calendar-week,
.calendar-grid {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: 4px;
}

.calendar-week {
  margin-bottom: 8px;
  color: var(--soft);
  font-family: var(--font-italic);
  font-style: italic;
  font-size: 11px;
  letter-spacing: var(--tracking-italic);
  text-align: center;
}

.calendar-day {
  aspect-ratio: 1;
  border: 0;
  border-radius: 0;
  color: var(--text);
  background: transparent;
  font-family: var(--font-serif);
  font-size: 13px;
  letter-spacing: 0.02em;
  transition: background var(--t-fast) var(--ease);
}

.calendar-day:hover {
  border: 0;
  background: rgba(26, 26, 26, 0.06);
}

.calendar-day.selected {
  color: var(--surface);
  border: 0;
  background: var(--text-strong);
  font-weight: 600;
}

.calendar-day.muted {
  color: var(--soft);
  opacity: 0.4;
  background: transparent;
}

.picker-footer {
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px solid var(--line);
}

.time-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: end;
  gap: 10px;
}

.time-grid label {
  display: grid;
  gap: 6px;
  color: var(--muted);
  font-family: var(--font-italic);
  font-style: italic;
  font-size: 12px;
}

.time-grid select {
  width: 100%;
  border: 0;
  border-bottom: 1px solid var(--line-strong);
  border-radius: 0;
  padding: 8px 4px;
  color: var(--text-strong);
  background: transparent;
  outline: none;
  font-family: var(--font-serif);
  font-size: 14px;
}

.time-grid > span {
  padding-bottom: 10px;
  color: var(--text-strong);
  font-weight: 500;
  font-family: var(--font-serif);
}

.inline-check {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-family: var(--font-italic);
  font-style: italic;
  font-size: 13px;
  letter-spacing: var(--tracking-italic);
}

.inline-check input {
  width: 14px;
  height: 14px;
  accent-color: var(--text-strong);
}

/* =========================================================
   Tarot cards
   ========================================================= */

.cards-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-bottom: 20px;
}

.tarot-card {
  display: flex;
  flex-direction: column;
  gap: 14px;
  border: 1px solid var(--line-strong);
  border-radius: 2px;
  padding: 16px;
  background: var(--surface);
  box-shadow: none;
}

.draw-card {
  opacity: 0;
  transform: translateY(14px);
  animation: card-enter 520ms var(--ease) forwards;
}

.draw-card:nth-child(2) { animation-delay: 90ms; }
.draw-card:nth-child(3) { animation-delay: 180ms; }

.tarot-flip {
  position: relative;
  aspect-ratio: 2 / 3;
  transform-style: preserve-3d;
  transition: transform 720ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

.draw-card.is-flipped .tarot-flip {
  transform: rotateY(180deg);
}

.tarot-face {
  position: absolute;
  inset: 0;
  overflow: hidden;
  backface-visibility: hidden;
  border: 1px solid var(--line-strong);
  border-radius: 2px;
  background: var(--bg-deep);
}

.tarot-face-front {
  transform: rotateY(180deg);
}

.tarot-face-back::after {
  content: "";
  position: absolute;
  inset: 8px;
  border: 1px solid var(--line-strong);
  border-radius: 0;
  pointer-events: none;
}

.tarot-back-label {
  position: absolute;
  left: 50%;
  bottom: 18px;
  transform: translateX(-50%);
  border: 0;
  border-radius: 0;
  padding: 0;
  color: var(--text-strong);
  background: transparent;
  font-family: var(--font-italic);
  font-style: italic;
  font-size: 12px;
  letter-spacing: var(--tracking-italic);
}

.tarot-image-wrap {
  aspect-ratio: 2 / 3;
  overflow: hidden;
  border: 1px solid var(--line-strong);
  border-radius: 2px;
  background: var(--bg-deep);
}

.tarot-image {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.tarot-image.reversed {
  transform: rotate(180deg);
}

.tarot-details {
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 360ms var(--ease), transform 360ms var(--ease);
}

.draw-card.is-flipped .tarot-details {
  opacity: 1;
  transform: translateY(0);
  transition-delay: 220ms;
}

.tarot-position {
  color: var(--muted);
  font-family: var(--font-italic);
  font-style: italic;
  font-size: 12px;
  letter-spacing: var(--tracking-italic);
}

.tarot-name {
  margin: 6px 0 4px;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(16px, 2.2vw, 19px);
  line-height: 1.3;
  letter-spacing: var(--tracking-mid);
  color: var(--text-strong);
}

.tarot-en {
  color: var(--soft);
  font-family: var(--font-italic);
  font-style: italic;
  font-size: 12px;
  letter-spacing: var(--tracking-italic);
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.tag {
  border: 1px solid var(--line);
  border-radius: 0;
  padding: 2px 8px;
  color: var(--muted);
  background: transparent;
  font-family: var(--font-italic);
  font-style: italic;
  font-size: 11.5px;
  letter-spacing: var(--tracking-italic);
}

/* =========================================================
   Generic placeholder
   ========================================================= */

.placeholder {
  display: grid;
  min-height: 420px;
  place-items: center;
  color: var(--muted);
  font-family: var(--font-italic);
  font-style: italic;
  font-size: 13px;
  letter-spacing: var(--tracking-italic);
  text-align: center;
  line-height: 1.85;
}

/* =========================================================
   Bazi chart
   ========================================================= */

.chart-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
}

.chart-cell {
  border: 1px solid var(--line-strong);
  border-radius: 0;
  padding: 18px 8px;
  text-align: center;
  background: var(--surface);
}

.chart-label {
  color: var(--muted);
  font-size: 12px;
  letter-spacing: 0.06em;
}

.pillar-stack {
  display: grid;
  justify-items: center;
  gap: 8px;
  margin-top: 12px;
}

.pillar-char {
  display: grid;
  width: 44px;
  height: 44px;
  place-items: center;
  border: 1px solid var(--line-strong);
  border-radius: 0;
  color: var(--text-strong);
  background: var(--surface-strong);
  font-family: var(--font-serif);
  font-size: 24px;
  line-height: 1;
  font-weight: 500;
}

.pillar-char.branch {
  border-color: var(--text-strong);
  color: var(--surface);
  background: var(--text-strong);
}

.bars {
  display: grid;
  gap: 14px;
  margin-top: 26px;
  border: 1px solid var(--line);
  border-radius: 0;
  padding: 22px 20px;
  background: transparent;
}

.bars-title {
  margin: 0 0 6px;
  color: var(--text-strong);
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 14px;
  letter-spacing: var(--tracking-mid);
}

.bar-line {
  display: grid;
  grid-template-columns: 36px minmax(120px, 1fr) 48px;
  gap: 14px;
  align-items: center;
  color: var(--text);
  font-family: var(--font-serif);
  font-size: 13px;
  letter-spacing: var(--tracking-soft);
}

.bar-track {
  height: 4px;
  overflow: hidden;
  border-radius: 0;
  background: rgba(26, 26, 26, 0.08);
  box-shadow: none;
}

.bar-fill {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: var(--text-strong);
  min-width: 2px;
  transition: width 600ms var(--ease);
}

/* Five elements — render as varying ink saturation, no color */
.bar-fill.wood   { background: rgba(26, 26, 26, 0.92); }
.bar-fill.fire   { background: rgba(26, 26, 26, 0.78); }
.bar-fill.earth  { background: rgba(26, 26, 26, 0.64); }
.bar-fill.metal  { background: rgba(26, 26, 26, 0.5); }
.bar-fill.water  { background: rgba(26, 26, 26, 0.36); }

.bar-value {
  color: var(--muted);
  text-align: right;
  font-family: var(--font-italic);
  font-style: italic;
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: 0;
}

.bazi-result-stack {
  display: grid;
  gap: 22px;
}

.bazi-card {
  border: 1px solid var(--line);
  border-radius: 0;
  padding: 24px 22px;
  background: transparent;
}

.bazi-card-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 18px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

.bazi-card-header h3 {
  margin: 0;
  color: var(--text-strong);
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 15px;
  letter-spacing: var(--tracking-mid);
}

.bazi-card-header span {
  color: var(--muted);
  font-family: var(--font-italic);
  font-style: italic;
  font-size: 11.5px;
  letter-spacing: var(--tracking-italic);
}

.bazi-chart-grid {
  margin-top: 4px;
}

.day-pillar {
  border-color: var(--text-strong);
  background: rgba(26, 26, 26, 0.04);
}

.pillar-shishen {
  margin-top: 10px;
  color: var(--muted);
  font-family: var(--font-italic);
  font-style: italic;
  font-size: 12px;
  letter-spacing: var(--tracking-italic);
}

.info-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.info-item {
  display: grid;
  gap: 6px;
  border: 0;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  border-radius: 0;
  padding: 14px 16px;
  background: transparent;
}

.info-item span {
  color: var(--soft);
  font-family: var(--font-italic);
  font-style: italic;
  font-size: 11.5px;
  letter-spacing: var(--tracking-italic);
}

.info-item strong {
  color: var(--text-strong);
  font-family: var(--font-serif);
  font-size: 14px;
  font-weight: 500;
  line-height: 1.5;
  letter-spacing: 0.02em;
}

.compact-bars {
  margin-top: 0;
  border: 0;
  padding: 0;
  background: transparent;
  box-shadow: none;
}

.dayun-list {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0;
  margin-top: 16px;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.dayun-item {
  display: grid;
  gap: 6px;
  border: 0;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  border-radius: 0;
  padding: 16px 10px;
  background: transparent;
  text-align: center;
}

.dayun-item strong {
  color: var(--text-strong);
  font-family: var(--font-serif);
  font-size: 15px;
  font-weight: 600;
}

.dayun-item span {
  color: var(--muted);
  font-family: var(--font-italic);
  font-style: italic;
  font-size: 11.5px;
}

.bazi-note {
  margin: 14px 0 0;
  color: var(--muted);
  font-family: var(--font-italic);
  font-style: italic;
  line-height: 1.8;
  font-size: 13px;
  letter-spacing: var(--tracking-italic);
}

.gold-tag {
  border-color: var(--text-strong);
  color: var(--text-strong);
}

.interaction-list {
  display: grid;
  gap: 12px;
  margin-top: 14px;
}

.interaction-item {
  display: grid;
  gap: 6px;
  border: 0;
  border-left: 1px solid var(--line-strong);
  border-radius: 0;
  padding: 4px 0 4px 14px;
  background: transparent;
}

.interaction-item strong {
  color: var(--text-strong);
  font-family: var(--font-serif);
  font-weight: 600;
  letter-spacing: var(--tracking-soft);
}

.interaction-item span {
  color: var(--muted);
  font-family: var(--font-serif);
  line-height: 1.75;
  font-size: 13px;
}

.judgement-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.judgement-grid article {
  border: 0;
  border-top: 1px solid var(--line-strong);
  border-radius: 0;
  padding: 16px 0 0;
  background: transparent;
}

.judgement-grid h4 {
  margin: 0 0 10px;
  color: var(--text-strong);
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 14px;
  letter-spacing: var(--tracking-mid);
}

.judgement-grid p {
  margin: 0;
  color: var(--muted);
  font-family: var(--font-serif);
  line-height: 1.85;
  font-size: 13px;
}

/* =========================================================
   History list
   ========================================================= */

.history-list {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

.history-item {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  border: 0;
  border-bottom: 1px solid var(--line);
  border-radius: 0;
  padding: 22px 4px;
  background: transparent;
  transition: background var(--t-fast) var(--ease);
}

.history-item:hover {
  border-color: var(--line);
  background: var(--surface);
}

.history-item h3 {
  margin: 0 0 8px;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 15px;
  letter-spacing: var(--tracking-mid);
  color: var(--text-strong);
}

.history-item p {
  margin: 0;
  color: var(--muted);
  font-family: var(--font-serif);
  font-size: 13px;
  line-height: 1.75;
}

.empty-state {
  border: 0;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  border-radius: 0;
  padding: 64px 20px;
  color: var(--muted);
  font-family: var(--font-italic);
  font-style: italic;
  font-size: 13px;
  letter-spacing: var(--tracking-italic);
  text-align: center;
  background: transparent;
}

/* =========================================================
   Records (history snapshots)
   ========================================================= */

.record-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 0;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.record-tabs {
  display: inline-flex;
  gap: 28px;
  border: 0;
  border-bottom: 1px solid var(--line);
  border-radius: 0;
  margin: 0 0 24px;
  padding: 0;
  background: transparent;
}

.record-tabs button {
  border: 0;
  border-radius: 0;
  padding: 8px 0;
  color: var(--muted);
  background: transparent;
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: 13px;
  letter-spacing: var(--tracking-soft);
  position: relative;
}

.record-tabs button:hover {
  color: var(--text-strong);
}

.record-tabs button.active {
  color: var(--text-strong);
  background: transparent;
  font-weight: 500;
}

.record-tabs button.active::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 1px;
  background: var(--text-strong);
}

.record-card {
  position: relative;
  min-height: 168px;
  border: 0;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  border-radius: 0;
  color: var(--text);
  background: transparent;
  overflow: hidden;
  transition: background var(--t-fast) var(--ease);
}

.record-card[hidden] {
  display: none;
}

.record-card:hover {
  border-color: var(--line);
  background: var(--surface);
  transform: none;
}

.record-card-main {
  display: grid;
  gap: 10px;
  width: 100%;
  min-height: 168px;
  border: 0;
  padding: 22px 20px;
  color: inherit;
  background: transparent;
  text-align: left;
}

.record-delete {
  position: absolute;
  top: 12px;
  right: 12px;
  display: grid;
  width: 26px;
  height: 26px;
  place-items: center;
  border: 0;
  border-radius: 0;
  color: #8a3d3d;
  background: transparent;
  opacity: 0;
  transition: opacity var(--t-fast) var(--ease), background var(--t-fast) var(--ease);
}

.record-delete svg {
  width: 14px;
  height: 14px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.4;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.record-card:hover .record-delete,
.record-delete:focus {
  opacity: 1;
}

.record-delete:hover {
  background: rgba(138, 61, 61, 0.08);
}

.record-type {
  width: fit-content;
  border: 0;
  border-bottom: 1px solid var(--text-strong);
  border-radius: 0;
  padding: 0 0 2px;
  color: var(--text-strong);
  background: transparent;
  font-family: var(--font-italic);
  font-style: italic;
  font-size: 11.5px;
  letter-spacing: var(--tracking-italic);
}

.record-card strong {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 15px;
  letter-spacing: var(--tracking-soft);
  color: var(--text-strong);
}

.record-card small,
.record-card time {
  color: var(--muted);
  font-family: var(--font-italic);
  font-style: italic;
  line-height: 1.6;
  font-size: 12px;
  letter-spacing: var(--tracking-italic);
}

/* =========================================================
   Snapshot modal
   ========================================================= */

.snapshot-modal {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: grid;
  place-items: center;
  padding: 24px;
}

.snapshot-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(74, 66, 56, 0.34);
  backdrop-filter: blur(4px);
}

.snapshot-dialog {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  width: min(1080px, 100%);
  max-height: min(86vh, 920px);
  border: 1px solid var(--line-strong);
  border-radius: 2px;
  background: var(--surface-strong);
  box-shadow: var(--shadow-3);
  overflow: hidden;
}

.snapshot-dialog > header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  border-bottom: 1px solid var(--line);
  padding: 18px 24px;
}

.snapshot-dialog header span {
  color: var(--muted);
  font-family: var(--font-italic);
  font-style: italic;
  font-size: 11.5px;
  letter-spacing: var(--tracking-italic);
}

.snapshot-dialog h3 {
  margin: 4px 0 0;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 16px;
  letter-spacing: var(--tracking-mid);
  color: var(--text-strong);
}

.snapshot-body {
  min-height: 0;
  overflow: auto;
  padding: 28px 32px;
}

.snapshot-body .reading-actions,
.snapshot-body button {
  pointer-events: none;
}

/* =========================================================
   Settings
   ========================================================= */

.settings-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.setting-card {
  border: 0;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  border-radius: 0;
  padding: 26px 24px;
  background: transparent;
}

.setting-card h3 {
  margin: 0 0 10px;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 14px;
  letter-spacing: var(--tracking-mid);
  color: var(--text-strong);
}

.setting-card p {
  margin: 0;
  color: var(--muted);
  font-family: var(--font-serif);
  line-height: 1.85;
  font-size: 13px;
}

/* =========================================================
   Responsive
   ========================================================= */

@media (max-width: 900px) {
  .app-workspace {
    grid-template-columns: 72px minmax(0, 1fr);
  }

  .sidebar {
    padding-inline: 10px;
  }

  .sidebar-copy,
  .side-label,
  .session-panel {
    display: none;
  }

  .side-action {
    grid-template-columns: auto;
    justify-content: center;
    padding-inline: 0;
  }

  .module-grid,
  .settings-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .workbench {
    grid-template-columns: 1fr;
  }

  .dayun-list,
  .judgement-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  body {
    overflow: hidden;
  }

  /* Layout becomes: [topbar] / [content], sidebar drawer floats over. */
  .app-workspace,
  .sidebar-collapsed {
    position: fixed;
    inset: var(--viewport-offset-top, 0px) var(--viewport-offset-right, 0px) var(--viewport-offset-bottom, 0px) var(--viewport-offset-left, 0px);
    grid-template-columns: 1fr;
    grid-template-rows: calc(52px + env(safe-area-inset-top, 0px)) minmax(0, 1fr);
    width: auto;
    height: auto;
    min-height: 0;
    transform: none;
  }

  /* ───── Mobile topbar ───── */
  .mobile-topbar {
    display: grid;
    grid-template-columns: 36px minmax(0, 1fr) 36px;
    align-items: center;
    gap: 8px;
    height: calc(52px + env(safe-area-inset-top, 0px));
    padding: env(safe-area-inset-top, 0px) 10px 0;
    background: var(--bg);
    border-bottom: 1px solid var(--line);
    z-index: 30;
    box-sizing: border-box;
  }

  .mobile-icon-button {
    display: grid;
    width: 36px;
    height: 36px;
    place-items: center;
    border: 0;
    border-radius: 6px;
    background: transparent;
    color: var(--text-strong);
    cursor: pointer;
    transition: background var(--t-fast) var(--ease);
  }

  .mobile-icon-button:hover,
  .mobile-icon-button:active {
    background: rgba(42, 39, 35, 0.06);
  }

  .mobile-title {
    font-family: var(--font-serif);
    font-size: 15px;
    font-weight: 600;
    letter-spacing: var(--tracking-mid);
    color: var(--text-strong);
    text-align: center;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  /* ───── Sidebar drawer ───── */
  .sidebar {
    position: fixed;
    top: calc(var(--viewport-offset-top, 0px) + env(safe-area-inset-top, 0px));
    right: auto;
    bottom: calc(var(--viewport-offset-bottom, 0px) + env(safe-area-inset-bottom, 0px));
    left: 0;
    width: min(86vw, 320px);
    height: auto;
    z-index: 50;
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    background: var(--bg);
    border-right: 1px solid var(--line);
    padding: 18px 16px calc(24px + env(safe-area-inset-bottom, 0px) + 72px);
    transform: translateX(-100%);
    transition: transform 280ms cubic-bezier(0.22, 0.81, 0.34, 1);
    box-shadow: 0 14px 40px rgba(0, 0, 0, 0.18);
    box-sizing: border-box;
  }

  body.mobile-drawer-open .sidebar {
    transform: translateX(0);
  }

  .sidebar::after {
    display: none;
  }

  /* Hide the desktop collapse arrow inside the drawer (not useful here). */
  .sidebar #toggle-sidebar {
    display: none;
  }

  /* Restore vertical sidebar internals (override the desktop-collapsed @900px rules). */
  .sidebar-head {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 14px;
  }

  .sidebar-copy,
  .side-label {
    display: inline;
  }

  .session-panel {
    display: grid;
  }

  .side-actions {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2px;
  }

  .side-action {
    grid-template-columns: auto minmax(0, 1fr);
    justify-content: flex-start;
    padding: 12px 10px;
    font-size: 15px;
  }

  .session-panel {
    margin-top: 14px;
  }

  .session-row {
    border-radius: 6px;
  }

  .session-item {
    padding: 12px 10px;
  }

  .auth-panel {
    margin-top: auto;
    padding-top: 18px;
    padding-bottom: 4px;
  }

  /* ───── Backdrop ───── */
  .sidebar-backdrop {
    display: block;
    position: fixed;
    inset: var(--viewport-offset-top, 0px) var(--viewport-offset-right, 0px) var(--viewport-offset-bottom, 0px) var(--viewport-offset-left, 0px);
    z-index: 40;
    background: rgba(40, 35, 28, 0.28);
    backdrop-filter: blur(10px) saturate(120%);
    -webkit-backdrop-filter: blur(10px) saturate(120%);
    opacity: 0;
    pointer-events: none;
    transition: opacity 240ms var(--ease);
  }

  body.mobile-drawer-open .sidebar-backdrop {
    opacity: 1;
    pointer-events: auto;
  }

  body.mobile-drawer-open {
    overflow: hidden;
  }

  /* ───── Content shell ───── */
  .content-shell {
    height: var(--app-height);
    overflow: auto;
    padding: calc(14px + env(safe-area-inset-top, 0px)) 14px calc(24px + env(safe-area-inset-bottom, 0px) + 72px);
    -webkit-overflow-scrolling: touch;
  }

  /* Chat-specific sizing for the new 52px topbar. */
  .chat-page {
    height: var(--app-height);
    min-height: 0;
  }

  .chat-topbar {
    min-height: auto;
    padding: calc(14px + env(safe-area-inset-top, 0px)) 4px 12px;
  }

  .chat-topbar h2 {
    font-size: 13px;
    letter-spacing: var(--tracking-mid);
  }

  .chat-empty h1 {
    font-size: clamp(22px, 7vw, 28px);
    line-height: 1.45;
  }

  .chat-empty::before {
    margin-bottom: 24px;
  }

  .chat-empty-wrap .chat-composer {
    width: 100%;
  }

  .chat-composer {
    width: 100%;
    margin: 0 auto 14px;
    padding: 12px 12px 10px 14px;
    border-radius: 4px;
    /* Respect iOS safe area without sucking up space when there isn't one. */
    padding-bottom: calc(10px + env(safe-area-inset-bottom, 0px));
    margin-bottom: calc(14px + env(safe-area-inset-bottom, 0px));
  }

  .chat-composer textarea {
    font-size: 16px; /* keeps iOS Safari from auto-zooming on focus */
  }

  .chat-messages {
    padding: 16px 4px calc(24px + env(safe-area-inset-bottom, 0px) + 72px);
  }

  .message-bubble {
    max-width: 92%;
    padding: 12px 14px;
  }

  .reading {
    font-size: 14.5px;
    line-height: 1.85;
  }

  .reading h1 { font-size: 18px; }
  .reading h2 { font-size: 16px; padding-top: 14px; margin-top: 24px; }
  .reading h3 { font-size: 15px; }

  /* ───── Other pages ───── */
  .topbar {
    align-items: start;
    flex-direction: column;
  }

  .hero {
    padding: 24px 4px;
  }

  .panel,
  .result-panel {
    padding: 18px 16px;
  }

  .module-grid,
  .cards-row,
  .settings-grid,
  .info-grid,
  .dayun-list,
  .judgement-grid,
  .workbench {
    grid-template-columns: 1fr;
  }

  .result-panel {
    min-height: 320px;
  }

  /* Mobile: form summary strip becomes more compact */
  .form-summary {
    padding: 12px 14px;
    gap: 12px;
  }

  .form-summary-label {
    padding-right: 12px;
    letter-spacing: 0.22em;
    font-size: 11px;
  }

  .form-summary-text {
    font-size: 13px;
  }

  .form-summary-action {
    padding-left: 10px;
    letter-spacing: 0.14em;
  }

  .form-summary-action span {
    display: none;
  }

  .history-item {
    flex-direction: column;
    gap: 6px;
  }

  .record-grid {
    grid-template-columns: 1fr;
  }

  /* Bazi chart: 4 narrow pillar columns are too tight on phones — let them wrap. */
  .chart-grid {
    overflow-x: auto;
  }

  .section-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    margin-bottom: 18px;
  }

  .section-header .button.ghost {
    align-self: flex-start;
  }

  /* Larger tap targets on mobile for record tabs and history rows. */
  .record-tabs button {
    padding: 10px 0;
  }

  .history-item {
    padding: 18px 4px;
  }
}

/* =========================================================
   Hi-res / large-screen scaling
   The base layout was tuned for ~1280–1440px viewports.
   On 1440 / 1920 / 2560 / 3200+ displays everything looked
   miniature (sidebar ≈ 80–120px, content adrift in whitespace).
   These tiers bump body font + sidebar + content widths
   proportionally so the layout fills the screen comfortably.
   ========================================================= */

@media (min-width: 1440px) {
  body {
    font-size: 16px;
  }

  .app-workspace {
    grid-template-columns: clamp(280px, 22vw, 340px) minmax(0, 1fr);
  }

  .chat-message {
    width: min(880px, 100%);
  }

  .chat-composer {
    width: min(840px, calc(100% - 32px));
  }

  .chat-empty-wrap .chat-composer {
    width: min(720px, 100%);
  }

  .chat-empty {
    max-width: 760px;
  }

  .reading {
    font-size: 16px;
  }

  .section {
    width: min(1240px, calc(100% - 48px));
  }

  .panel {
    padding: 32px 30px;
  }

  .result-panel {
    padding: 36px 36px;
  }
}

@media (min-width: 1920px) {
  body {
    font-size: 17px;
  }

  .app-workspace {
    grid-template-columns: clamp(320px, 19vw, 400px) minmax(0, 1fr);
  }

  .chat-page,
  .chat-empty-wrap {
    padding-left: clamp(0px, 4vw, 80px);
    padding-right: clamp(0px, 4vw, 80px);
  }

  .chat-messages {
    padding: 32px clamp(24px, 6vw, 96px) 36px;
  }

  .chat-message {
    width: min(960px, 100%);
  }

  .chat-composer {
    width: min(900px, calc(100% - 48px));
  }

  .chat-empty-wrap .chat-composer {
    width: min(760px, 100%);
  }

  .chat-empty {
    max-width: 820px;
  }

  .chat-empty h1 {
    font-size: clamp(32px, 2.4vw, 44px);
  }

  .chat-topbar {
    padding: 22px clamp(24px, 6vw, 96px) 16px;
  }

  .reading {
    font-size: 17px;
    line-height: 2;
  }

  .reading h2 { font-size: 22px; }
  .reading h3 { font-size: 18px; }

  .section {
    width: min(1360px, calc(100% - 64px));
    margin-top: 64px;
  }

  .hero {
    min-height: clamp(440px, 56vh, 660px);
    padding: 72px 0 48px;
  }

  .hero h1 {
    font-size: clamp(34px, 2.6vw, 48px);
  }

  .hero p {
    font-size: 16px;
    max-width: 620px;
  }

  .panel {
    padding: 36px 34px;
  }

  .result-panel {
    padding: 44px 44px;
  }

  .workbench {
    gap: 24px;
    margin-top: 36px;
  }

  .form-panel .form-stack {
    max-width: 720px;
  }
}

@media (min-width: 2560px) {
  body {
    font-size: 18px;
    line-height: 1.75;
  }

  .app-workspace {
    grid-template-columns: clamp(360px, 16vw, 460px) minmax(0, 1fr);
  }

  .sidebar {
    padding: 28px 22px;
  }

  .brand-title { font-size: 22px; }
  .brand-subtitle { font-size: 13px; }
  .side-action { font-size: 16px; padding: 12px 14px; }
  .session-item { padding: 14px 12px; }

  .chat-messages {
    padding: 40px clamp(40px, 7vw, 140px) 44px;
    gap: 4px;
  }

  .chat-message {
    width: min(1080px, 100%);
  }

  .chat-composer {
    width: min(1000px, calc(100% - 64px));
    padding: 18px 20px 14px 22px;
  }

  .chat-empty-wrap .chat-composer {
    width: min(820px, 100%);
  }

  .chat-empty {
    max-width: 880px;
  }

  .chat-empty h1 {
    font-size: clamp(38px, 2.2vw, 52px);
  }

  .chat-topbar {
    padding: 28px clamp(40px, 7vw, 140px) 20px;
  }

  .chat-topbar h2 {
    font-size: 16px;
  }

  .message-bubble {
    padding: 18px 22px;
    font-size: 16px;
  }

  .reading {
    font-size: 18px;
    line-height: 2.05;
  }

  .reading h2 { font-size: 24px; }
  .reading h3 { font-size: 20px; }
  .reading h4 { font-size: 16px; }

  .section {
    width: min(1480px, calc(100% - 96px));
    margin-top: 72px;
  }

  .section-title { font-size: 22px; }
  .section-note { font-size: 15px; }

  .hero {
    min-height: clamp(500px, 58vh, 760px);
    padding: 96px 0 64px;
  }

  .hero h1 {
    font-size: clamp(40px, 2.8vw, 56px);
  }

  .hero p {
    font-size: 17px;
    max-width: 680px;
  }

  .panel {
    padding: 44px 40px;
  }

  .result-panel {
    padding: 52px 52px;
    min-height: min(640px, calc(100vh - 200px));
  }

  .workbench {
    gap: 32px;
    margin-top: 44px;
  }

  .form-panel .form-stack {
    max-width: 800px;
  }

  .module-grid,
  .cards-row,
  .settings-grid,
  .info-grid {
    gap: 24px;
  }

  .button {
    font-size: 15px;
  }
}

@media (min-width: 3200px) {
  body {
    font-size: 20px;
    line-height: 1.78;
  }

  .app-workspace {
    grid-template-columns: clamp(440px, 14vw, 560px) minmax(0, 1fr);
  }

  .sidebar {
    padding: 32px 26px;
  }

  .brand-title { font-size: 26px; }
  .brand-subtitle { font-size: 14px; }
  .side-action { font-size: 17px; padding: 14px 16px; }
  .session-item { padding: 16px 14px; }

  .chat-messages {
    padding: 56px clamp(64px, 8vw, 200px) 56px;
  }

  .chat-message {
    width: min(1240px, 100%);
  }

  .chat-composer {
    width: min(1120px, calc(100% - 96px));
    padding: 22px 24px 18px 26px;
  }

  .chat-empty-wrap .chat-composer {
    width: min(900px, 100%);
  }

  .chat-empty {
    max-width: 980px;
  }

  .chat-empty h1 {
    font-size: clamp(44px, 2vw, 64px);
  }

  .chat-topbar {
    padding: 36px clamp(64px, 8vw, 200px) 24px;
  }

  .chat-topbar h2 {
    font-size: 18px;
  }

  .message-bubble {
    padding: 22px 26px;
    font-size: 18px;
  }

  .reading {
    font-size: 20px;
    line-height: 2.1;
  }

  .reading h2 { font-size: 28px; }
  .reading h3 { font-size: 22px; }
  .reading h4 { font-size: 18px; }

  .section {
    width: min(1680px, calc(100% - 128px));
    margin-top: 96px;
  }

  .section-title { font-size: 26px; }
  .section-note { font-size: 16px; }

  .hero {
    min-height: clamp(600px, 60vh, 880px);
    padding: 128px 0 80px;
  }

  .hero h1 {
    font-size: clamp(48px, 3vw, 68px);
  }

  .hero p {
    font-size: 19px;
    max-width: 760px;
  }

  .panel {
    padding: 52px 48px;
  }

  .result-panel {
    padding: 64px 64px;
    min-height: min(760px, calc(100vh - 240px));
  }

  .workbench {
    gap: 40px;
    margin-top: 56px;
  }

  .form-panel .form-stack {
    max-width: 880px;
  }
}

/* =========================================================
   Confirm dialog — frosted-glass backdrop, literary card.
   Replaces native window.confirm for delete/destructive actions.
   ========================================================= */

.confirm-modal {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: grid;
  place-items: center;
  padding: 24px;
}

.confirm-modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(40, 35, 28, 0.18);
  backdrop-filter: blur(10px) saturate(120%);
  -webkit-backdrop-filter: blur(10px) saturate(120%);
  opacity: 0;
  transition: opacity 180ms var(--ease);
}

.confirm-modal.is-open .confirm-modal-backdrop {
  opacity: 1;
}

.confirm-card {
  position: relative;
  width: min(380px, 100%);
  background: #fdfbf6;
  border: 1px solid rgba(26, 26, 26, 0.05);
  border-radius: 14px;
  padding: 22px 22px 16px;
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.9) inset,
    0 24px 60px rgba(40, 35, 28, 0.18),
    0 4px 14px rgba(40, 35, 28, 0.08);
  transform: translateY(8px) scale(0.98);
  opacity: 0;
  transition:
    transform 220ms var(--ease),
    opacity 200ms var(--ease);
}

.confirm-modal.is-open .confirm-card {
  transform: translateY(0) scale(1);
  opacity: 1;
}

.confirm-card-body {
  display: grid;
  gap: 8px;
  margin-bottom: 22px;
}

.confirm-card-title {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 16px;
  letter-spacing: var(--tracking-soft);
  color: var(--text-strong);
}

.confirm-card-text {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--text);
  letter-spacing: 0.02em;
}

.confirm-card-text strong {
  color: var(--text-strong);
  font-weight: 600;
}

.confirm-card-meta {
  display: inline-block;
  margin-top: 4px;
  color: var(--muted);
  font-size: 12.5px;
  font-family: var(--font-italic);
  font-style: italic;
  letter-spacing: var(--tracking-italic);
}

.confirm-card-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
}

.confirm-btn {
  border: 0;
  border-radius: 999px;
  padding: 9px 18px;
  font-family: var(--font-serif);
  font-size: 13.5px;
  font-weight: 500;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition:
    background var(--t-fast) var(--ease),
    color var(--t-fast) var(--ease),
    border-color var(--t-fast) var(--ease),
    transform var(--t-fast) var(--ease);
}

.confirm-btn-secondary {
  border: 1px solid rgba(26, 26, 26, 0.18);
  background: transparent;
  color: var(--text-strong);
}

.confirm-btn-secondary:hover {
  background: rgba(26, 26, 26, 0.05);
  border-color: rgba(26, 26, 26, 0.32);
}

.confirm-btn-primary {
  background: var(--text-strong);
  color: #f8f4ea;
}

.confirm-btn-primary:hover {
  background: #000;
}

.confirm-btn-danger {
  background: #c14638;
  color: #fff;
}

.confirm-btn-danger:hover {
  background: #a8392c;
}

.confirm-btn:focus-visible {
  outline: 2px solid rgba(26, 26, 26, 0.45);
  outline-offset: 2px;
}

.confirm-btn:active {
  transform: translateY(1px);
}

@media (max-width: 720px) {
  .confirm-card {
    width: 100%;
    padding: 20px;
  }
  .confirm-card-title { font-size: 15.5px; }
}

/* =========================================================
   Login prompt — explicit gate for anonymous entry.
   ========================================================= */

body.login-prompt-open {
  overflow: hidden;
}

.login-prompt-modal {
  position: fixed;
  inset: 0;
  z-index: 260;
  display: grid;
  place-items: center;
  padding: 24px;
  pointer-events: none;
  opacity: 0;
  transition: opacity 180ms var(--ease);
}

.login-prompt-modal.is-open {
  pointer-events: auto;
  opacity: 1;
}

.login-prompt-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(40, 35, 28, 0.38);
  backdrop-filter: blur(12px) saturate(120%);
  -webkit-backdrop-filter: blur(12px) saturate(120%);
}

.login-prompt-card {
  position: relative;
  z-index: 1;
  width: min(560px, 100%);
  padding: 28px;
  border-radius: 20px;
  border: 1px solid rgba(26, 26, 26, 0.08);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(250, 246, 236, 0.96));
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.96) inset,
    0 30px 70px rgba(40, 35, 28, 0.18),
    0 10px 24px rgba(40, 35, 28, 0.08);
  transform: translateY(10px) scale(0.985);
  transition:
    transform 220ms var(--ease),
    opacity 220ms var(--ease);
}

.login-prompt-modal.is-open .login-prompt-card {
  transform: translateY(0) scale(1);
}

.login-prompt-copy {
  display: grid;
  gap: 10px;
}

.login-prompt-eyebrow {
  margin: 0;
  color: var(--soft);
  font-family: var(--font-serif);
  font-size: 12px;
  letter-spacing: var(--tracking-mid);
}

.login-prompt-title {
  margin: 0;
  color: var(--text-strong);
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(20px, 2.2vw, 28px);
  line-height: 1.45;
  letter-spacing: var(--tracking-soft);
}

.login-prompt-desc {
  margin: 0;
  color: var(--muted);
  font-family: var(--font-serif);
  font-size: 14px;
  line-height: 1.8;
}

.login-prompt-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: flex-end;
  margin-top: 24px;
}

.login-prompt-login,
.login-prompt-skip {
  min-width: 120px;
  justify-content: center;
}

@media (max-width: 720px) {
  .login-prompt-modal {
    inset: var(--viewport-offset-top, 0px) var(--viewport-offset-right, 0px) var(--viewport-offset-bottom, 0px) var(--viewport-offset-left, 0px);
    padding: 16px;
  }

  .login-prompt-card {
    width: 100%;
    max-width: 520px;
    padding: 22px 18px;
    border-radius: 16px;
  }

  .login-prompt-actions {
    justify-content: stretch;
  }

  .login-prompt-login,
  .login-prompt-skip {
    min-width: 0;
    flex: 1 1 0;
  }
}