/* ============================================================
   Words — Palm Editorial 设计系统 (design.md + UI_COMPONENTS.md)
   禁止 Emoji / 禁止页面级自定义颜色 / 圆角 / 阴影
   ============================================================ */

:root {
  /* Colors */
  --primary: #43593B;
  --primary-dark: #28311F;
  --primary-soft: #77835A;
  --accent: #D4A017;
  --accent-soft: #F2D17E;
  --olive: #ACAD79;
  --ink: #58402E;
  --ink-strong: #3F3024;
  --body: rgba(88, 64, 46, .72);
  --muted: rgba(88, 64, 46, .60);
  --faint: rgba(88, 64, 46, .32);
  --quiet: rgba(88, 64, 46, .15);
  --track: rgba(88, 64, 46, .12);
  --grid: rgba(88, 64, 46, .16);
  --canvas: #F0EFEB;
  --surface-card: #F0EFEB;
  --surface-soft: #E9E8E2;
  --surface: #FFFFFF;
  --surface-dark: #28311F;
  --on-primary: #F0EFEB;
  --on-dark: #F0EFEB;
  --success: #43593B;
  --warning: #D4A017;
  --error: #A54A3A;
  --info: #5F7860;

  /* Typography */
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --fs-display-xl: 56px; --fw-display-xl: 700; --lh-display-xl: 1.05;
  --fs-display-lg: 42px; --fw-display-lg: 700; --lh-display-lg: 1.10;
  --fs-display-md: 32px; --fw-display-md: 700; --lh-display-md: 1.15;
  --fs-display-sm: 26px; --fw-display-sm: 700; --lh-display-sm: 1.20;
  --fs-title-lg: 20px; --fw-title-lg: 700; --lh-title-lg: 1.30;
  --fs-title-md: 17px; --fw-title-md: 600; --lh-title-md: 1.40;
  --fs-title-sm: 15px; --fw-title-sm: 600; --lh-title-sm: 1.45;
  --fs-label: 11px; --fw-label: 600; --ls-label: 0.08em;
  --fs-body-md: 15px; --fw-body-md: 400; --lh-body-md: 1.65;
  --fs-body-sm: 13px; --fw-body-sm: 400; --lh-body-sm: 1.55;
  --fs-caption: 10px; --fw-caption: 500;
  --fs-number-xl: 40px; --fw-number-xl: 800; --ls-number-xl: -0.04em;
  --fs-number-lg: 28px; --fw-number-lg: 800; --ls-number-lg: -0.03em;
  --fs-button: 13px; --fw-button: 600;

  /* Radius */
  --r-none: 0; --r-xs: 4px; --r-sm: 8px; --r-md: 12px; --r-lg: 16px; --r-xl: 24px; --r-full: 9999px;

  /* Spacing */
  --s-xxs: 4px; --s-xs: 8px; --s-sm: 12px; --s-md: 16px; --s-lg: 24px; --s-xl: 32px; --s-xxl: 48px;
  --s-section: 72px; --s-page: 40px;

  /* Layout */
  --max-w: 1440px;
  --content-w: 1240px;
  --nav-h: 64px;
  --bottom-nav-h: 68px;
  --shadow-modal: 0 8px 40px rgba(40, 49, 31, .12);

  /* Motion */
  --m-fast: 150ms; --m-base: 250ms; --m-card: 400ms;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--font);
  font-size: var(--fs-body-md);
  line-height: var(--lh-body-md);
  color: var(--ink);
  background: var(--canvas);
  -webkit-font-smoothing: antialiased;
}
img, svg { display: inline-block; vertical-align: middle; }
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
button, input, select, textarea { font-family: inherit; font-size: inherit; color: inherit; }
:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }
::selection { background: var(--accent-soft); }

/* ---------- Typography ---------- */
.t-display-xl { font-size: var(--fs-display-xl); font-weight: var(--fw-display-xl); line-height: var(--lh-display-xl); letter-spacing: -.035em; }
.t-display-lg { font-size: var(--fs-display-lg); font-weight: var(--fw-display-lg); line-height: var(--lh-display-lg); letter-spacing: -.03em; }
.t-display-md { font-size: var(--fs-display-md); font-weight: var(--fw-display-md); line-height: var(--lh-display-md); letter-spacing: -.025em; }
.t-display-sm { font-size: var(--fs-display-sm); font-weight: var(--fw-display-sm); line-height: var(--lh-display-sm); letter-spacing: -.02em; }
.t-title-lg { font-size: var(--fs-title-lg); font-weight: var(--fw-title-lg); line-height: var(--lh-title-lg); letter-spacing: -.015em; }
.t-title-md { font-size: var(--fs-title-md); font-weight: var(--fw-title-md); line-height: var(--lh-title-md); }
.t-title-sm { font-size: var(--fs-title-sm); font-weight: var(--fw-title-sm); }
.t-label { font-size: var(--fs-label); font-weight: var(--fw-label); letter-spacing: var(--ls-label); text-transform: uppercase; }
.t-body { font-size: var(--fs-body-md); color: var(--ink); }
.t-body-sm { font-size: var(--fs-body-sm); color: var(--body); }
.t-caption { font-size: var(--fs-caption); font-weight: var(--fw-caption); letter-spacing: .08em; color: var(--faint); text-transform: uppercase; }
.t-number-xl { font-size: var(--fs-number-xl); font-weight: var(--fw-number-xl); letter-spacing: var(--ls-number-xl); line-height: 1; }
.t-number-lg { font-size: var(--fs-number-lg); font-weight: var(--fw-number-lg); letter-spacing: var(--ls-number-lg); line-height: 1; }
.t-muted { color: var(--muted); }
.t-strong { color: var(--ink-strong); }
.t-primary { color: var(--primary); }
.t-error { color: var(--error); }
.t-success { color: var(--success); }

/* ---------- App Shell ---------- */
.app-shell { max-width: var(--max-w); margin: 0 auto; padding: 0 var(--s-xl); }
.content { max-width: var(--content-w); margin: 0 auto; }

/* ---------- Top Nav ---------- */
.top-nav {
  position: sticky; top: 0; z-index: 50;
  height: var(--nav-h);
  background: rgba(240, 239, 235, .94);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--grid);
}
.top-nav-inner { max-width: var(--max-w); margin: 0 auto; padding: 0 var(--s-xl); height: 100%; display: flex; align-items: center; gap: var(--s-lg); }
.brand { display: flex; align-items: center; gap: var(--s-sm); }
.brand-mark {
  width: 32px; height: 32px; border-radius: var(--r-sm);
  background: var(--primary); color: var(--on-primary);
  display: flex; align-items: center; justify-content: center;
  font-size: 15px; font-weight: 700;
}
.brand-name { font-size: var(--fs-title-md); font-weight: 700; color: var(--ink-strong); }
.nav-links { display: flex; gap: var(--s-lg); margin-left: var(--s-lg); }
.nav-link {
  font-size: var(--fs-nav, 13px); font-weight: 500; color: var(--muted);
  padding: 6px 2px; border-bottom: 2px solid transparent; cursor: pointer;
}
.nav-link:hover { color: var(--ink); text-decoration: none; }
.nav-link.active { color: var(--primary); border-bottom-color: var(--primary); }
.nav-account { margin-left: auto; display: flex; align-items: center; gap: var(--s-md); }
.nav-user { font-size: var(--fs-body-sm); color: var(--muted); }

/* ---------- Bottom Nav (mobile) ---------- */
.bottom-nav {
  display: none;
  position: fixed; bottom: 0; left: 0; right: 0; z-index: 50;
  height: var(--bottom-nav-h);
  background: rgba(240, 239, 235, .96);
  border-top: 1px solid var(--grid);
}
.bottom-nav-item {
  flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 4px;
  font-size: var(--fs-label); font-weight: 600; letter-spacing: .06em;
  color: var(--muted); cursor: pointer;
}
.bottom-nav-item.active { color: var(--primary); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: var(--s-xs);
  font-size: var(--fs-button); font-weight: var(--fw-button); line-height: 1;
  border-radius: var(--r-md); border: 1px solid transparent;
  min-height: 44px; padding: 13px 20px; cursor: pointer;
  transition: background var(--m-fast), border-color var(--m-fast), color var(--m-fast), opacity var(--m-fast);
  user-select: none; text-decoration: none;
}
.btn:hover { text-decoration: none; }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn-primary { background: var(--primary); color: var(--on-primary); }
.btn-primary:hover { background: var(--primary-dark); }
.btn-secondary { background: transparent; color: var(--primary); border-color: var(--primary); }
.btn-secondary:hover { background: var(--quiet); }
.btn-quiet { background: transparent; color: var(--body); min-height: 40px; padding: 10px 14px; }
.btn-quiet:hover { background: var(--quiet); color: var(--ink); }
.btn-danger { background: transparent; color: var(--error); border-color: var(--error); }
.btn-danger:hover { background: rgba(165, 74, 58, .08); }
.btn-block { width: 100%; }
.btn-sm { min-height: 36px; padding: 8px 14px; font-size: 12px; border-radius: var(--r-sm); }
.btn.loading { position: relative; color: transparent; pointer-events: none; }
.btn.loading::after {
  content: ''; position: absolute; width: 16px; height: 16px;
  border: 2px solid currentColor; border-top-color: transparent; border-radius: 50%;
  animation: spin .7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- IconButton ---------- */
.icon-btn {
  width: 44px; height: 44px; border-radius: var(--r-full);
  background: var(--surface-soft); border: none; cursor: pointer;
  display: inline-flex; align-items: center; justify-content: center;
  color: var(--ink); transition: background var(--m-fast);
}
.icon-btn:hover { background: var(--quiet); }

/* ---------- Icons ---------- */
.ui-icon { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.ui-icon-sm { width: 16px; height: 16px; }
.ui-icon-lg { width: 24px; height: 24px; }

/* ---------- Inputs ---------- */
.field { display: flex; flex-direction: column; gap: var(--s-xs); margin-bottom: var(--s-md); }
.field-label { font-size: var(--fs-body-sm); font-weight: 500; color: var(--ink); }
.field-hint { font-size: var(--fs-body-sm); color: var(--muted); }
.input, .select, .textarea {
  width: 100%; min-height: 46px; padding: 12px 16px;
  background: var(--surface); border: 1px solid var(--grid);
  border-radius: var(--r-md); color: var(--ink);
  font-size: var(--fs-body-md); transition: border-color var(--m-fast);
}
.input:focus, .select:focus, .textarea:focus { outline: none; border-color: var(--primary); }
.input.error, .select.error, .textarea.error { border-color: var(--error); }
.input:disabled, .select:disabled, .textarea:disabled { background: var(--surface-soft); color: var(--faint); cursor: not-allowed; }
.textarea { min-height: 120px; resize: vertical; line-height: var(--lh-body-md); }
.field-error { font-size: var(--fs-body-sm); color: var(--error); }

.search-input { position: relative; }
.search-input .input { padding-left: 44px; }
.search-input .search-icon { position: absolute; left: 14px; top: 50%; transform: translateY(-50%); color: var(--muted); }

/* ---------- Cards ---------- */
.card { border: 1px solid var(--grid); border-radius: var(--r-xl); }
.card-editorial { background: var(--surface-card); padding: 28px 28px 22px; }
.card-elevated { background: var(--surface); padding: var(--s-lg); }
.card-dark { background: var(--surface-dark); color: var(--on-dark); padding: 28px; }
.card-stat { background: var(--surface-card); padding: 24px 24px 20px; }
.card-chart { background: var(--surface-card); padding: 28px 28px 20px; }
.card-pad-lg { padding: var(--s-xl); }
.card-pad-md { padding: var(--s-lg); }

/* ---------- Stat ---------- */
.stat-label { font-size: var(--fs-label); font-weight: 600; letter-spacing: var(--ls-label); text-transform: uppercase; color: var(--muted); }
.stat-value { font-size: var(--fs-number-lg); font-weight: 800; letter-spacing: var(--ls-number-lg); color: var(--primary); line-height: 1.15; }
.stat-hint { font-size: var(--fs-body-sm); color: var(--muted); margin-top: var(--s-xs); }

/* ---------- MetricGrid ---------- */
.metric-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--s-md); }
@media (max-width: 1024px) { .metric-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 767px) { .metric-grid { grid-template-columns: 1fr; } }

/* ---------- Tags / Chips ---------- */
.tag {
  display: inline-flex; align-items: center;
  font-size: var(--fs-caption); font-weight: 500; letter-spacing: .04em;
  background: var(--quiet); color: var(--primary);
  border-radius: var(--r-full); padding: 5px 9px;
}
.book-chip {
  display: inline-flex; align-items: center;
  font-size: var(--fs-caption); font-weight: 600; letter-spacing: .04em;
  background: var(--primary); color: var(--on-primary);
  border-radius: var(--r-full); padding: 6px 10px;
}
.book-chip.unselected { background: var(--surface-soft); color: var(--ink); }

/* ---------- Badge ---------- */
.status-badge {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 11px; font-weight: 700;
  padding: 5px 12px; border-radius: var(--r-full);
  color: #fff; letter-spacing: .02em;
}
.status-badge .dot { width: 6px; height: 6px; border-radius: 50%; background: currentColor; }
.sb-success { background: var(--success); }
.sb-warning { background: #c98a12; }
.sb-error { background: var(--error); }
.sb-info { background: #4a6fa5; }
.sb-muted { background: #8a9189; }

/* ============================================================
 * 门户首页（Lexora · 词序）—— Palm Editorial
 * ============================================================ */
.portal-nav { border-bottom-color: rgba(88,64,46,.10); }
.portal-hero {
  max-width: 1120px; margin: 0 auto; padding: 88px 32px 72px;
  display: grid; grid-template-columns: 1.05fr .95fr; gap: 64px; align-items: center;
}
.portal-eyebrow { font-size: 11px; font-weight: 600; letter-spacing: .22em; color: var(--primary-soft); margin-bottom: 20px; }
.portal-h1 { font-size: 52px; font-weight: 700; line-height: 1.12; letter-spacing: -.03em; color: var(--ink-strong); margin: 0 0 16px; }
.portal-sub { font-size: 16px; font-weight: 600; color: var(--primary); letter-spacing: .02em; margin-bottom: 20px; }
.portal-lead { font-size: 16px; line-height: 1.8; color: var(--body); margin: 0 0 32px; }
.portal-hero-cta { gap: 12px; }
.portal-hero-visual { min-width: 0; }
.portal-visual-card {
  background: var(--surface); border: 1px solid var(--grid); border-radius: var(--r-xl);
  padding: 24px 24px 16px;
}
.portal-curve { width: 100%; height: auto; display: block; margin-top: 12px; }
.portal-visual-foot { justify-content: space-between; margin-top: 12px; }

.portal-section { padding: 88px 32px; }
.portal-section-soft { background: var(--surface-soft); }
.portal-narrow { max-width: 760px; margin: 0 auto; }
.portal-overline { font-size: 11px; font-weight: 600; letter-spacing: .22em; color: var(--primary-soft); margin-bottom: 16px; }
.portal-h2 { font-size: 32px; font-weight: 700; line-height: 1.2; letter-spacing: -.02em; color: var(--ink-strong); margin: 0 0 20px; }
.portal-h3 { font-size: 17px; font-weight: 600; color: var(--ink-strong); margin: 0 0 10px; }
.portal-para { font-size: 15px; line-height: 1.9; color: var(--body); margin: 0 0 28px; }
.portal-para-sm { font-size: 13px; line-height: 1.7; color: var(--body); margin: 0 0 18px; }

.portal-stages-line { display: flex; align-items: center; gap: 0; margin-top: 36px; }
.portal-stage-node { display: flex; flex-direction: column; align-items: center; gap: 8px; flex: 1; position: relative; }
.portal-stage-node:not(:last-child)::after {
  content: ''; position: absolute; top: 5px; left: 50%; width: 100%;
  border-top: 1px solid var(--grid);
}
.portal-stage-dot { width: 11px; height: 11px; border-radius: 50%; background: var(--surface); border: 2px solid var(--primary-soft); z-index: 1; }
.portal-stage-dot.is-last { background: var(--primary); border-color: var(--primary); }

.portal-three {
  max-width: 1120px; margin: 48px auto 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 40px;
}
.portal-three-item { padding: 8px 0; }
.portal-num { font-size: 13px; font-weight: 700; color: var(--faint); letter-spacing: .08em; margin-bottom: 8px; }
.portal-wordcard, .portal-revcard, .portal-aicard {
  background: var(--surface); border: 1px solid var(--grid); border-radius: var(--r-lg);
  padding: 20px; margin-top: 8px;
}
.portal-word { font-size: 22px; font-weight: 700; color: var(--ink-strong); }
.portal-phonetic { font-size: 13px; color: var(--muted); margin-top: 4px; }
.portal-pos { display: inline-block; background: var(--primary); color: var(--on-primary); font-size: 11px; font-weight: 600; border-radius: var(--r-sm); padding: 3px 8px; margin-top: 10px; }
.portal-def { font-size: 13px; color: var(--body); margin-top: 10px; line-height: 1.6; }
.portal-revcard .row-between { padding: 7px 0; border-bottom: 1px solid rgba(88,64,46,.07); }
.portal-revcard .row-between:last-child { border-bottom: none; }
.portal-ai-sentence { font-size: 14px; color: var(--ink); margin-top: 10px; line-height: 1.6; }
.portal-ai-fix { font-size: 14px; color: var(--success); font-weight: 600; margin-top: 6px; }
.portal-ai-tags { display: flex; gap: 8px; margin-top: 12px; flex-wrap: wrap; }
.portal-ai-tag { font-size: 10px; font-weight: 600; letter-spacing: .06em; border-radius: var(--r-full); padding: 4px 10px; }
.portal-ai-tag.ok { background: rgba(67,89,59,.12); color: var(--primary); }
.portal-ai-tag.warn { background: rgba(212,160,23,.16); color: #8a6a0e; }

.portal-flow { display: flex; align-items: center; justify-content: center; flex-wrap: wrap; gap: 10px; margin-top: 40px; }
.portal-flow-item { display: flex; align-items: center; gap: 10px; }
.portal-flow-node {
  font-size: 12px; font-weight: 600; color: var(--primary); letter-spacing: .04em;
  border: 1px solid var(--grid); border-radius: var(--r-md); background: var(--surface);
  padding: 10px 16px;
}
.portal-flow-arrow { color: var(--faint); font-size: 14px; }
.portal-flow-note { width: 100%; text-align: center; font-size: 12px; color: var(--accent); font-weight: 600; margin-top: 14px; letter-spacing: .1em; }

.portal-split { max-width: 1120px; margin: 0 auto; display: grid; grid-template-columns: 1fr 1fr; gap: 72px; align-items: center; }
.portal-ai-panel, .portal-data-panel {
  background: var(--surface); border: 1px solid var(--grid); border-radius: var(--r-xl); padding: 28px;
}
.portal-ai-row { display: flex; gap: 8px; margin-top: 14px; flex-wrap: wrap; }
.portal-ai-block { margin-top: 16px; }
.portal-ai-block .t-caption { margin-bottom: 6px; }

.portal-hm-wrap { margin-top: 14px; }
.portal-hm { display: flex; gap: 3px; flex-wrap: wrap; }
.portal-hm-col { display: flex; flex-direction: column; gap: 3px; }
.portal-hm-cell { width: 11px; height: 11px; border-radius: 3px; background: var(--track); }
.portal-hm-cell.l1 { background: #c6e48b; }
.portal-hm-cell.l2 { background: #7bc96f; }
.portal-hm-cell.l3 { background: #30a14e; }
.portal-hm-cell.l4 { background: #196127; }
.portal-hm-legend { align-items: center; gap: 5px; margin-top: 14px; }

.portal-books { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-top: 36px; }
.portal-book { background: var(--surface); border: 1px solid var(--grid); border-radius: var(--r-lg); padding: 18px 20px; }

.portal-formula {
  display: flex; align-items: center; justify-content: center; flex-wrap: wrap; gap: 12px;
  margin: 40px 0 16px;
}
.portal-f-item { font-size: 14px; font-weight: 600; color: var(--ink); border: 1px solid var(--grid); border-radius: var(--r-md); background: var(--surface); padding: 12px 18px; }
.portal-f-op { color: var(--faint); font-size: 14px; }
.portal-f-arrow { color: var(--primary); font-size: 16px; font-weight: 600; }
.portal-f-result { font-size: 14px; font-weight: 700; color: var(--on-primary); background: var(--primary); border-radius: var(--r-md); padding: 12px 22px; }

.portal-cta { background: var(--surface-dark); padding: 88px 32px; text-align: center; }
.portal-cta .btn { min-width: 180px; }

.portal-footer { background: var(--surface-dark); border-top: 1px solid rgba(240,239,235,.08); padding: 40px 32px 56px; }
.portal-footer-top { max-width: 1120px; margin: 0 auto; justify-content: space-between; align-items: center; gap: 20px; flex-wrap: wrap; }
.portal-footer-top a { color: rgba(240,239,235,.66); }
.portal-footer-top a:hover { color: var(--on-dark); }
.portal-footer-slogan { max-width: 1120px; margin: 36px auto 0; text-align: center; font-size: 13px; color: rgba(240,239,235,.4); letter-spacing: .04em; }

/* ---------- 门户响应式 ---------- */
@media (max-width: 900px) {
  .portal-hero { grid-template-columns: 1fr; gap: 48px; padding: 64px 24px 56px; }
  .portal-h1 { font-size: 40px; }
  .portal-three { grid-template-columns: 1fr; gap: 40px; }
  .portal-split { grid-template-columns: 1fr; gap: 48px; }
  .portal-books { grid-template-columns: repeat(2, 1fr); }
  .portal-section { padding: 64px 24px; }
  .portal-cta { padding: 64px 24px; }
  .portal-formula { gap: 8px; }
  .portal-f-item { padding: 10px 14px; font-size: 13px; }
}
@media (max-width: 520px) {
  .portal-h1 { font-size: 32px; }
  .portal-h2 { font-size: 26px; }
  .portal-stages-line .t-caption { font-size: 10px; letter-spacing: 0; }
  .portal-books { grid-template-columns: 1fr 1fr; }
  .portal-hm-cell { width: 9px; height: 9px; }
  .portal-footer-top { flex-direction: column; align-items: flex-start; gap: 16px; }
}

/* ---------- Progress ---------- */
.progress { height: 6px; border-radius: var(--r-full); background: var(--track); overflow: hidden; }
.progress-fill { height: 100%; border-radius: var(--r-full); background: var(--primary); transition: width var(--m-base); }
.prof-track { height: 10px; border-radius: var(--r-full); background: rgba(240,239,235,.14); overflow: hidden; }
.prof-fill { height: 100%; border-radius: var(--r-full); background: var(--primary); transition: width var(--m-base); }

/* ---------- Table ---------- */
.table-wrap { overflow-x: auto; border: 1px solid var(--grid); border-radius: var(--r-xl); background: var(--surface-card); }
.table { width: 100%; border-collapse: collapse; font-size: var(--fs-body-sm); }
.table th {
  background: var(--surface-soft); color: var(--muted);
  font-size: var(--fs-caption); font-weight: 600; letter-spacing: .06em; text-transform: uppercase;
  text-align: center; padding: 12px 16px; white-space: nowrap;
}
.table th:first-child { text-align: left; }
.table td { padding: 14px 16px; border-bottom: 1px solid var(--grid); color: var(--body); vertical-align: middle; }
.table td.ops { text-align: center; }
.table td.ops .row { justify-content: center; }
.table tr:last-child td { border-bottom: none; }
.table .num { text-align: right; font-variant-numeric: tabular-nums; }
.table tr:hover td { background: rgba(67, 89, 59, .04); }

/* ---------- Pagination ---------- */
.pagination { display: flex; align-items: center; gap: var(--s-xs); margin-top: var(--s-md); }
.pagination .page-btn {
  min-width: 36px; height: 36px; padding: 0 10px;
  border: 1px solid var(--grid); border-radius: var(--r-sm);
  background: var(--surface); color: var(--body); font-size: 13px; cursor: pointer;
}
.pagination .page-btn.active { background: var(--primary); color: var(--on-primary); border-color: var(--primary); }
.pagination .page-info { font-size: var(--fs-body-sm); color: var(--muted); margin-left: auto; }

/* ---------- Modal ---------- */
.modal-overlay {
  position: fixed; inset: 0; z-index: 100;
  background: rgba(40, 49, 31, .35);
  display: none; align-items: flex-start; justify-content: center;
  padding: 80px 16px; overflow-y: auto;
}
.modal-overlay.open { display: flex; }
.modal {
  background: var(--surface); border: 1px solid var(--grid);
  border-radius: var(--r-xl); padding: 28px;
  width: 100%; max-width: 520px;
  box-shadow: var(--shadow-modal);
}
.modal-title { font-size: var(--fs-title-lg); font-weight: 700; color: var(--ink-strong); margin-bottom: 4px; }
.modal-desc { font-size: var(--fs-body-sm); color: var(--muted); margin-bottom: var(--s-lg); }
.modal-actions { display: flex; justify-content: flex-end; gap: var(--s-sm); margin-top: var(--s-lg); }

/* ---------- Alert ---------- */
.alert { border-radius: var(--r-md); padding: 14px 16px; font-size: var(--fs-body-sm); margin-bottom: var(--s-md); border: 1px solid transparent; }
.alert-title { font-weight: 600; margin-bottom: 2px; }
.alert-info { background: rgba(95, 120, 96, .10); border-color: rgba(95, 120, 96, .3); color: var(--info); }
.alert-success { background: rgba(67, 89, 59, .10); border-color: rgba(67, 89, 59, .3); color: var(--success); }
.alert-warning { background: rgba(212, 160, 23, .10); border-color: rgba(212, 160, 23, .35); color: #8a6a0e; }
.alert-error { background: rgba(165, 74, 58, .10); border-color: rgba(165, 74, 58, .3); color: var(--error); }

/* ---------- Toast ---------- */
.toast-wrap { position: fixed; top: 80px; right: 24px; z-index: 200; display: flex; flex-direction: column; gap: 8px; }
.toast {
  background: var(--ink-strong); color: var(--canvas);
  font-size: var(--fs-body-sm); border-radius: var(--r-md);
  padding: 12px 16px; box-shadow: var(--shadow-modal);
  animation: toast-in var(--m-base) ease;
}
@keyframes toast-in { from { opacity: 0; transform: translateY(-8px); } to { opacity: 1; transform: none; } }

/* ---------- Empty / Loading ---------- */
.empty-state { text-align: center; padding: 48px 24px; color: var(--muted); }
.empty-state .empty-title { font-size: var(--fs-title-md); color: var(--ink); margin-bottom: 4px; }
.empty-state .empty-action { margin-top: var(--s-md); }
.spinner {
  width: 20px; height: 20px; border: 2px solid var(--track);
  border-top-color: var(--primary); border-radius: 50%;
  animation: spin .7s linear infinite; display: inline-block;
}
.loading-block { display: flex; align-items: center; justify-content: center; gap: var(--s-sm); padding: var(--s-xl); color: var(--muted); font-size: var(--fs-body-sm); }

/* ---------- Word Card ---------- */
.word-card {
  background: var(--surface); border: 1px solid var(--grid);
  border-radius: var(--r-xl); padding: 40px 40px 32px;
  max-width: 720px; margin: 0 auto;
}
.word-main { font-size: var(--fs-display-xl); font-weight: 700; letter-spacing: -.035em; color: var(--ink-strong); line-height: 1.05; text-align: center; }
.word-phonetic { text-align: center; color: var(--muted); font-size: var(--fs-body-sm); margin-top: var(--s-sm); }
.word-pos {
  display: inline-block; background: var(--primary); color: var(--on-primary);
  font-size: var(--fs-label); font-weight: 600; letter-spacing: .04em;
  border-radius: var(--r-sm); padding: 4px 8px; margin: var(--s-md) 4px 0 0;
}
.word-def { text-align: center; font-size: var(--fs-body-md); color: var(--ink); padding: var(--s-xs) 0; }
.word-example { background: var(--surface-soft); color: var(--body); border-radius: var(--r-md); padding: 14px 16px; font-size: var(--fs-body-sm); margin-top: var(--s-md); }
.word-tags { text-align: center; margin-top: var(--s-md); display: flex; gap: 6px; justify-content: center; flex-wrap: wrap; }

/* ---------- 初学/重学词卡 ---------- */
.word-card-detail { text-align: left; }
.word-card-detail .word-main { margin-bottom: 4px; }
.word-def { margin-top: 2px; }
.word-pos { display: inline-block; min-width: 34px; color: var(--olive); font-weight: 600; }
.card-defs { border-top: 1px solid var(--grid); padding-top: var(--s-md); }
.card-section { border-top: 1px solid var(--grid); margin-top: var(--s-md); padding-top: var(--s-md); }
.card-example { background: var(--surface-soft); border-radius: var(--r-md); padding: 12px 14px; }
.card-known-wrap { max-width: 480px; margin: var(--s-lg) auto 0; }
.word-card-detail .word-tags { justify-content: flex-start; }

/* ---------- Answer buttons ---------- */
.answer-area { max-width: 720px; margin: var(--s-lg) auto 0; display: flex; gap: var(--s-md); }
.answer-btn { flex: 1; min-height: 56px; font-size: 15px; font-weight: 600; border-radius: var(--r-md); cursor: pointer; border: 1px solid var(--grid); background: var(--surface); color: var(--ink-strong); transition: all var(--m-fast); }
.answer-btn:hover { border-color: var(--primary); }
.answer-btn.correct { background: var(--success); color: var(--on-primary); border-color: var(--success); }
.answer-btn.wrong { background: var(--error); color: #fff; border-color: var(--error); }
.choice-options { max-width: 720px; margin: var(--s-md) auto 0; display: grid; gap: var(--s-sm); }
.choice-option {
  min-height: 52px; padding: 12px 20px; text-align: left;
  border: 1px solid var(--grid); border-radius: var(--r-md);
  background: var(--surface); color: var(--ink); font-size: var(--fs-body-md);
  cursor: pointer; transition: border-color var(--m-fast), background var(--m-fast);
}
.choice-option:hover { border-color: var(--primary); }
.choice-option.selected { border-color: var(--primary); background: rgba(67, 89, 59, .06); }
.choice-option.correct { border-color: var(--success); background: rgba(67, 89, 59, .10); color: var(--success); }
.choice-option.wrong { border-color: var(--error); background: rgba(165, 74, 58, .08); color: var(--error); }

/* ---------- Learning session bar ---------- */
.learning-bar { max-width: 720px; margin: 0 auto var(--s-lg); display: flex; align-items: center; gap: var(--s-md); }
.learning-bar .lb-item { font-size: var(--fs-body-sm); color: var(--muted); }
.learning-bar .lb-item strong { color: var(--ink); font-variant-numeric: tabular-nums; }

/* ---------- Announcement ---------- */
.announcement-bar { background: var(--primary); color: var(--on-primary); font-size: var(--fs-body-sm); }
.announcement-inner { max-width: 1080px; margin: 0 auto; padding: 10px 20px; line-height: 1.5; }

/* ---------- 选书卡片 ---------- */
.book-pick-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 12px; }
.book-pick-card { border: 1.5px solid var(--grid); border-radius: var(--r-lg); padding: 16px; cursor: pointer; background: var(--surface); transition: border-color .15s, box-shadow .15s; }
.book-pick-card:hover { border-color: var(--olive); }
.book-pick-card.selected { border-color: var(--primary); box-shadow: 0 0 0 2px color-mix(in srgb, var(--primary) 15%, transparent); }
.book-pick-card.unselected .book-pick-check { opacity: 0; }
.book-pick-check { color: var(--primary); font-weight: 700; }

/* ---------- 词书分布 ---------- */
.book-dist { display: flex; flex-direction: column; gap: 10px; }
.book-dist-row { display: flex; align-items: center; gap: 10px; }
.book-dist-name { flex: 0 0 120px; font-size: var(--fs-body-sm); color: var(--ink); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.book-dist-bar { flex: 1; height: 8px; background: var(--track); border-radius: 999px; overflow: hidden; }
.book-dist-fill { height: 100%; background: var(--primary); border-radius: 999px; min-width: 2px; }
.book-dist-num { flex: 0 0 90px; font-size: var(--fs-caption); color: var(--muted); text-align: right; font-variant-numeric: tabular-nums; }

/* ---------- 门户首页 ---------- */
.home-hero { text-align: center; padding: 72px 16px 40px; }

/* ---------- Heatmap ---------- */
.heatmap-wrap { overflow-x: auto; padding-bottom: var(--s-xs); }
.heatmap { display: flex; gap: 3px; width: max-content; }
.heatmap-col { display: flex; flex-direction: column; gap: 3px; }
.heatmap-month-label { height: 14px; font-size: 9px; color: var(--muted); line-height: 14px; white-space: nowrap; }
.heatmap-cell { width: 12px; height: 12px; border-radius: 3px; }
.heatmap-cell.l0 { background: var(--surface-soft); }
.heatmap-cell.l1 { background: #c6e48b; }
.heatmap-cell.l2 { background: #7bc96f; }
.heatmap-cell.l3 { background: #30a14e; }
.heatmap-cell.l4 { background: #239a3b; }
.heatmap-cell.l5 { background: #196127; }
.heatmap-legend { display: flex; align-items: center; gap: 4px; margin-top: var(--s-sm); justify-content: flex-end; }
.heatmap-legend .heatmap-cell { display: inline-block; }

/* ---------- Chart ---------- */
.chart-title { font-size: var(--fs-title-lg); font-weight: 700; color: var(--ink-strong); }
.chart-subtitle { font-size: var(--fs-body-sm); color: var(--muted); margin-top: 2px; }
.chart-source { font-size: var(--fs-caption); color: var(--faint); margin-top: 10px; }
.bar-chart { display: flex; align-items: flex-end; gap: 6px; height: 160px; padding-top: var(--s-md); }
.bar { flex: 1; background: var(--primary); border-radius: var(--r-xs) var(--r-xs) 0 0; min-width: 4px; opacity: .85; }
.bar:hover { opacity: 1; }
.bar-empty { background: var(--track); }
.donut-legend { display: flex; flex-direction: column; gap: 8px; margin-top: var(--s-md); }
.donut-legend-item { display: flex; align-items: center; gap: 8px; font-size: var(--fs-body-sm); color: var(--body); }
.donut-legend-item .dot { width: 10px; height: 10px; border-radius: 3px; }
.lieflat-chart { width: 100%; height: 200px; display: block; }

/* ---------- Page header ---------- */
.page-header { padding: var(--s-page) 0 var(--s-lg); }
.page-header .ph-title { font-size: var(--fs-display-sm); font-weight: 700; color: var(--ink-strong); letter-spacing: -.02em; }
.page-header .ph-desc { color: var(--muted); font-size: var(--fs-body-sm); margin-top: 4px; }
.page-header .ph-actions { margin-top: var(--s-md); display: flex; gap: var(--s-sm); }

/* ---------- Layout helpers ---------- */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: var(--s-md); }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--s-md); }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--s-md); }
.section { margin-bottom: var(--s-section); }
.section-title { font-size: var(--fs-title-lg); font-weight: 700; color: var(--ink-strong); margin-bottom: var(--s-md); }
.stack { display: flex; flex-direction: column; gap: var(--s-md); }
.row { display: flex; gap: var(--s-md); align-items: center; }
.row-between { display: flex; justify-content: space-between; align-items: center; gap: var(--s-md); }
.hidden { display: none !important; }
.mt-sm { margin-top: var(--s-sm); } .mt-md { margin-top: var(--s-md); } .mt-lg { margin-top: var(--s-lg); } .mt-xl { margin-top: var(--s-xl); }
.mb-sm { margin-bottom: var(--s-sm); } .mb-md { margin-bottom: var(--s-md); } .mb-lg { margin-bottom: var(--s-lg); }
.text-center { text-align: center; }
.flex-1 { flex: 1; }

/* ---------- Auth pages ---------- */
.auth-wrap { max-width: 420px; margin: 48px auto; }
.auth-card { background: var(--surface); border: 1px solid var(--grid); border-radius: var(--r-xl); padding: var(--s-xl); }

/* ---------- Admin sidebar ---------- */
.admin-layout { display: flex; min-height: 100vh; }
.admin-sidebar {
  width: 220px; flex-shrink: 0; background: var(--surface-dark); color: var(--on-dark);
  padding: var(--s-lg) 0; position: sticky; top: 0; height: 100vh; overflow-y: auto;
}
.admin-sidebar .side-brand { padding: 0 var(--s-lg) var(--s-lg); display: flex; align-items: center; gap: var(--s-sm); }
.admin-sidebar .side-link {
  display: block; padding: 10px var(--s-lg); color: rgba(240, 239, 235, .7);
  font-size: 13px; font-weight: 500; cursor: pointer;
}
.admin-sidebar .side-link:hover { color: var(--on-dark); background: rgba(240, 239, 235, .08); text-decoration: none; }
.admin-sidebar .side-link.active { color: var(--accent-soft); background: rgba(240, 239, 235, .10); }
.admin-sidebar .side-group { font-size: 10px; letter-spacing: .1em; text-transform: uppercase; color: rgba(240, 239, 235, .4); padding: var(--s-md) var(--s-lg) 4px; }
.admin-main { flex: 1; padding: var(--s-page) var(--s-xl) var(--s-xxl); min-width: 0; }
.admin-main .content { max-width: 1200px; }

/* ---------- Writing editor ---------- */
.writing-editor { min-height: 220px; }
.word-chip-used { border-color: var(--success); color: var(--success); background: rgba(67, 89, 59, .06); }
.word-chip-unused { border-color: var(--grid); color: var(--body); }
.word-chip-unknown { border-color: var(--grid); color: var(--faint); }

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .admin-sidebar { width: 200px; }
}
@media (max-width: 767px) {
  .app-shell { padding: 0 var(--s-md); }
  .top-nav-inner { padding: 0 var(--s-md); }
  .nav-links { display: none; }
  .bottom-nav { display: flex; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .word-card { padding: var(--s-lg); }
  .word-main { font-size: 40px; }
  .answer-area { flex-direction: column; }
  .admin-sidebar { display: none; }
  .admin-sidebar.open { display: block; position: fixed; z-index: 90; }
  .admin-mobile-bar { display: flex; }
  .page-header { padding-top: var(--s-lg); }
  body { padding-bottom: var(--bottom-nav-h); }
  body.learning-active { padding-bottom: 0; }
  .table-wrap { border-radius: var(--r-lg); }
}
@media (min-width: 768px) {
  .admin-mobile-bar { display: none !important; }
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}

/* ---------- Misc ---------- */
.divider { border: none; border-top: 1px solid var(--grid); margin: var(--s-lg) 0; }
.kbd { background: var(--surface-soft); border-radius: 4px; padding: 2px 6px; font-size: 12px; color: var(--muted); }
.required-mark { color: var(--error); }
.ai-feedback-section { border-left: 3px solid var(--primary-soft); padding-left: var(--s-md); margin-top: var(--s-md); }
.ai-feedback-section h4 { margin: 0 0 4px; font-size: var(--fs-title-sm); color: var(--ink-strong); }