:root {
  --bg: #0d1117;
  --bg2: #161b22;
  --bg3: #1c2333;
  --border: #30363d;
  --text: #c9d1d9;
  --text-dim: #8b949e;
  --text-head: #e6edf3;
  --accent: #3fb950;
  --accent2: #58a6ff;
  --accent3: #d2a8ff;
  --accent4: #ffa657;
  --warn: #f78166;
  --card-bg: rgba(22, 27, 34, 0.85);
  --card-border: rgba(48, 54, 61, 0.8);
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.5);
  --font-mono: "JetBrains Mono", monospace;
  --font-body: "DM Sans", sans-serif;
  --font-head: "Fraunces", serif;
  --text-scale: 1;
  --content-base: 16px;
  --radius: 6px;
  --radius-lg: 10px;
  --nav-h: 56px;
  --bottom-nav-h: 0px;
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --safe-left: env(safe-area-inset-left, 0px);
  --safe-right: env(safe-area-inset-right, 0px);
}

[data-theme="light"] {
  --bg: #f6f8fa;
  --bg2: #ffffff;
  --bg3: #eaeef2;
  --border: #d0d7de;
  --text: #24292f;
  --text-dim: #57606a;
  --text-head: #1f2328;
  --card-bg: rgba(255, 255, 255, 0.92);
  --card-border: rgba(208, 215, 222, 0.9);
  --shadow: 0 2px 12px rgba(0, 0, 0, 0.1);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body), -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  min-height: 100dvh;
  font-size: 14px;
  line-height: 1.6;
  transition: background 0.2s, color 0.2s;
  -webkit-text-size-adjust: 100%;
  overscroll-behavior-y: none;
}

body.sidebar-open,
body.sheet-open {
  overflow: hidden;
  touch-action: none;
}

button, .cat-btn, .tool-btn, .nav-btn, .quiz-opt, .mobile-more-item {
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }

.app-grid {
  display: grid;
  grid-template-columns: 240px 1fr;
  grid-template-rows: var(--nav-h) 1fr;
  grid-template-areas: "nav nav" "side main";
  height: 100vh;
  height: 100dvh;
  overflow: hidden;
}

.sidebar-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
  z-index: 90;
  opacity: 0;
  transition: opacity 0.2s;
}

.sidebar-backdrop.open {
  display: block;
  opacity: 1;
}

.nav-actions { display: flex; align-items: center; gap: 8px; flex-wrap: nowrap; }
.nav-mobile-more { display: none; min-width: 44px; min-height: 44px; font-size: 18px; line-height: 1; }

.bottom-nav {
  display: none;
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 300;
  background: var(--bg2);
  border-top: 1px solid var(--border);
  padding-bottom: var(--safe-bottom);
  box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.25);
}

.bottom-nav-btn {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
  min-height: 56px;
  padding: 6px 4px;
  background: none;
  border: none;
  color: var(--text-dim);
  font-family: var(--font-mono);
  font-size: 10px;
  cursor: pointer;
}

.bottom-nav-btn svg { opacity: 0.75; }
.bottom-nav-btn:active { background: rgba(63, 185, 80, 0.08); }
.bottom-nav-btn.active { color: var(--accent); }
.bottom-nav-btn.active svg { opacity: 1; stroke: var(--accent); }

.mobile-more-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  padding: 12px 16px 20px;
}

.mobile-more-item {
  min-height: 48px;
  padding: 12px 14px;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 12px;
  text-align: left;
  cursor: pointer;
}

.mobile-more-item:active { background: var(--bg); border-color: var(--accent2); }

.sheet-handle {
  width: 36px;
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  margin: 10px auto 0;
}

@media (max-width: 768px) {
  :root { --bottom-nav-h: calc(56px + var(--safe-bottom)); }

  .app-grid {
    grid-template-columns: 1fr;
    grid-template-areas: "nav" "main";
    grid-template-rows: calc(var(--nav-h) + var(--safe-top)) 1fr;
  }

  #navbar {
    padding-top: var(--safe-top);
    padding-left: calc(10px + var(--safe-left));
    padding-right: calc(10px + var(--safe-right));
    height: calc(var(--nav-h) + var(--safe-top));
  }

  #sidebar {
    display: flex;
    position: fixed;
    left: 0;
    top: calc(var(--nav-h) + var(--safe-top));
    bottom: var(--bottom-nav-h);
    width: min(300px, 88vw);
    z-index: 100;
    box-shadow: var(--shadow);
    transform: translateX(-105%);
    transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    padding-bottom: var(--safe-bottom);
  }

  #sidebar.open { transform: translateX(0); }

  #menu-toggle { display: flex !important; min-width: 44px; min-height: 44px; }
  .nav-title { display: none; }
  .nav-desktop { display: none; }
  .nav-mobile-more { display: none; }
  .nav-logo { flex: 1; font-size: 13px; }

  .progress-pill {
    font-size: 11px;
    padding: 6px 10px;
    max-width: none;
    min-width: 64px;
    flex-shrink: 0;
    text-align: center;
  }

  .bottom-nav { display: flex; }

  #main {
    padding: 12px;
    padding-left: calc(12px + var(--safe-left));
    padding-right: calc(12px + var(--safe-right));
    padding-bottom: calc(12px + var(--bottom-nav-h));
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    overscroll-behavior: contain;
  }

  .toolbar {
    position: sticky;
    top: 0;
    z-index: 20;
    background: var(--bg);
    padding: 8px 0 10px;
    margin: -4px 0 4px;
    border-bottom: 1px solid var(--border);
  }

  .qa-card { border-radius: var(--radius-lg); }
  .qa-card.open .qa-answer { max-height: 8000px; }
  .qa-answer-inner {
    padding: 0 14px 16px;
    font-size: calc(var(--content-base) * var(--text-scale) * 0.98);
    line-height: 1.65;
  }
  .qa-header { padding: 16px 14px; gap: 10px; }
  .qa-q { font-size: 1.08em; line-height: 1.45; }

  .mobile-more-grid {
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    padding: 8px 16px calc(20px + var(--safe-bottom));
  }
  .mobile-more-item { min-height: 48px; font-size: 12px; }

  .gloss-box .modal-body,
  #kpi-body {
    max-height: min(60dvh, 520px);
    -webkit-overflow-scrolling: touch;
  }

  .bottom-nav-btn { min-height: 52px; }

  .footer {
    margin: 0 calc(-12px - var(--safe-left)) calc(-12px - var(--bottom-nav-h));
    padding-bottom: calc(12px + var(--safe-bottom));
  }

  .footer-meta { align-items: flex-start; width: 100%; margin-top: 4px; }

  .toolbar { flex-direction: column; align-items: stretch; }
  .search-wrap { min-width: 0; width: 100%; }
  #search { font-size: 16px; padding: 12px 12px 12px 36px; min-height: 48px; }
  .toolbar-actions {
    display: flex;
    flex-direction: row;
    gap: 6px;
    width: 100%;
  }
  .toolbar-actions .tool-btn {
    flex: 1;
    min-width: 0;
    min-height: 40px;
    padding: 8px 4px;
    font-size: 10px;
    line-height: 1.25;
    white-space: normal;
    text-align: center;
  }

  .section-header { flex-wrap: wrap; gap: 6px; }
  .section-sub { width: 100%; margin-left: 0; }

  .qa-header { flex-wrap: wrap; padding: 14px; min-height: 48px; }
  .qa-q { font-size: 1.05em; width: calc(100% - 38px); }
  .qa-meta { width: 100%; padding-left: 38px; justify-content: space-between; }
  .diff-badge { font-size: 10px; padding: 4px 8px; }

  .master-label { min-height: 44px; padding: 4px 0; }
  .master-check { width: 22px; height: 22px; }

  .quiz-opt { min-height: 48px; padding: 12px 14px; font-size: 1em; }
  .tool-btn, .nav-btn { min-height: 44px; }

  .mock-q { font-size: 1.2em; }
  .mock-actions .tool-btn { flex: 1; min-width: calc(50% - 4px); }

  .modal { padding: 0; align-items: flex-end; }
  .modal-box {
    max-width: none;
    max-height: 92dvh;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    padding-bottom: var(--safe-bottom);
  }

  .mobile-sheet .modal-box { animation: slideUp 0.25s ease; }
  .modal-search input { font-size: 16px; min-height: 44px; padding: 10px 12px; }

  .param-table:not(.vendor-table) { display: block; overflow-x: auto; -webkit-overflow-scrolling: touch; }
  .cat-btn { min-height: 44px; padding: 10px 16px; font-size: 13px; }
}

@keyframes slideUp {
  from { transform: translateY(100%); }
  to { transform: translateY(0); }
}

@media (max-width: 768px) {
  .app-grid { grid-template-columns: 1fr; grid-template-areas: "nav" "main"; }
}

#navbar {
  grid-area: nav;
  background: var(--bg2);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 14px;
  z-index: 200;
}

.nav-logo {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.05em;
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: 6px;
}

.nav-title {
  font-family: var(--font-head);
  font-size: 13px;
  font-weight: 600;
  color: var(--text-head);
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.progress-pill {
  font-family: var(--font-mono);
  font-size: 10px;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 3px 10px;
  color: var(--accent);
  white-space: nowrap;
}

.nav-btn {
  background: var(--bg3);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: var(--radius);
  padding: 5px 10px;
  font-size: 11px;
  font-family: var(--font-mono);
  cursor: pointer;
  white-space: nowrap;
  transition: border-color 0.15s, color 0.15s;
}

.nav-btn:hover { border-color: var(--accent2); color: var(--accent2); }
#menu-toggle { display: none; align-items: center; justify-content: center; }

#sidebar {
  grid-area: side;
  background: var(--bg2);
  border-right: 1px solid var(--border);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  padding: 12px 0;
}

.sidebar-label {
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 700;
  color: var(--text-dim);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 8px 16px 4px;
}

.cat-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 16px;
  cursor: pointer;
  border-left: 2px solid transparent;
  font-size: 12px;
  color: var(--text-dim);
  transition: all 0.12s;
  background: none;
  border-top: none;
  border-right: none;
  border-bottom: none;
  width: 100%;
  text-align: left;
  font-family: var(--font-body);
}

.cat-btn:hover { background: var(--bg3); color: var(--text); }
.cat-btn.active {
  border-left-color: var(--accent);
  color: var(--text-head);
  background: var(--bg3);
}

.cat-count {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 9px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1px 5px;
  color: var(--text-dim);
}

.sidebar-sep { height: 1px; background: var(--border); margin: 8px 16px; }

#main {
  grid-area: main;
  overflow-y: auto;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.toolbar { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }

.toolbar-actions { display: flex; gap: 8px; flex-shrink: 0; }

.search-wrap { position: relative; flex: 1; min-width: 180px; }
.search-wrap svg {
  position: absolute;
  left: 9px;
  top: 50%;
  transform: translateY(-50%);
  opacity: 0.4;
  pointer-events: none;
}

#search {
  width: 100%;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 7px 10px 7px 32px;
  font-size: 12px;
  font-family: var(--font-mono);
  color: var(--text);
  outline: none;
  transition: border-color 0.15s;
}

#search:focus { border-color: var(--accent2); }
#search::placeholder { color: var(--text-dim); }

.tool-btn {
  background: var(--bg2);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: var(--radius);
  padding: 6px 12px;
  font-size: 11px;
  font-family: var(--font-mono);
  cursor: pointer;
  white-space: nowrap;
  transition: border-color 0.15s, color 0.15s, background 0.15s;
}

.tool-btn:hover { border-color: var(--accent); color: var(--accent); }
.tool-btn.active { border-color: var(--accent); color: var(--accent); background: rgba(63, 185, 80, 0.08); }

.section-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
}

.section-num {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  color: var(--accent);
  background: rgba(63, 185, 80, 0.12);
  border: 1px solid rgba(63, 185, 80, 0.3);
  border-radius: var(--radius);
  padding: 2px 7px;
  letter-spacing: 0.05em;
}

.section-title {
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 600;
  color: var(--text-head);
  font-style: italic;
}

.section-sub { font-size: 11px; color: var(--text-dim); margin-left: auto; }

.qa-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color 0.15s, box-shadow 0.15s;
  animation: fadeIn 0.15s ease both;
}

.qa-card:hover { border-color: var(--accent2); box-shadow: var(--shadow); }
.qa-card.mastered { border-left: 3px solid var(--accent); }

.qa-header {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 12px 14px;
  cursor: pointer;
  user-select: none;
}

.qa-num {
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 700;
  color: var(--text-dim);
  background: var(--bg3);
  border-radius: 4px;
  padding: 2px 5px;
  min-width: 28px;
  text-align: center;
  flex-shrink: 0;
  margin-top: 2px;
}

.qa-q {
  flex: 1;
  min-width: 0;
  font-size: 1em;
  font-weight: 500;
  color: var(--text-head);
  line-height: 1.45;
  overflow-wrap: break-word;
}

.qa-meta { display: flex; align-items: center; gap: 6px; flex-shrink: 0; }

.diff-badge {
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 700;
  border-radius: 4px;
  padding: 2px 6px;
  letter-spacing: 0.04em;
  white-space: nowrap;
}

.diff-easy { background: rgba(63, 185, 80, 0.15); color: var(--accent); border: 1px solid rgba(63, 185, 80, 0.3); }
.diff-medium { background: rgba(255, 166, 87, 0.15); color: var(--accent4); border: 1px solid rgba(255, 166, 87, 0.3); }
.diff-hard { background: rgba(247, 129, 102, 0.15); color: var(--warn); border: 1px solid rgba(247, 129, 102, 0.3); }

.chevron { flex-shrink: 0; transition: transform 0.2s; color: var(--text-dim); }
.qa-card.open .chevron { transform: rotate(180deg); }

.tags { display: flex; gap: 4px; flex-wrap: wrap; padding: 0 14px 8px; }

.tag {
  font-family: var(--font-mono);
  font-size: 9px;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 1px 5px;
  color: var(--text-dim);
}

.qa-answer { max-height: 0; overflow: hidden; transition: max-height 0.35s cubic-bezier(0.4, 0, 0.2, 1); }
.qa-card.open .qa-answer { max-height: 4000px; }

.answer-inner {
  border-top: 1px solid var(--border);
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.answer-section {
  font-size: 9px;
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--accent2);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.answer-inner p {
  font-size: 0.9375em;
  color: var(--text);
  line-height: 1.7;
  overflow-wrap: break-word;
}

.answer-inner ul {
  padding-left: 1.25em;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.answer-inner li {
  font-size: 0.9375em;
  color: var(--text);
  line-height: 1.7;
  overflow-wrap: break-word;
}

.answer-inner li::marker { color: var(--accent2); }
.answer-inner strong { color: var(--text-head); font-weight: 600; }

.answer-inner code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 0 4px;
  color: var(--accent3);
}

.why-box {
  background: rgba(88, 166, 255, 0.06);
  border: 1px solid rgba(88, 166, 255, 0.2);
  border-radius: var(--radius);
  padding: 8px 12px;
}

.why-box p { font-size: 11px; color: var(--accent2); }

.card-actions {
  padding: 0 14px 12px;
  border-top: 1px solid transparent;
}

.qa-card.open .card-actions { border-top-color: var(--border); padding-top: 10px; }

.master-label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  color: var(--text-dim);
  cursor: pointer;
  font-family: var(--font-mono);
}

.master-check { width: 16px; height: 16px; accent-color: var(--accent); cursor: pointer; }

.hr-toolbar-extras {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  width: 100%;
  padding-top: 4px;
}

.hr-type-btn { font-size: 10px; padding: 5px 8px; }
.hr-type-count {
  font-family: var(--font-mono);
  font-size: 9px;
  opacity: 0.7;
  margin-left: 2px;
}

.hr-type-badge {
  background: rgba(210, 168, 255, 0.15);
  color: var(--accent3);
  border: 1px solid rgba(210, 168, 255, 0.3);
}

.tag-comp {
  color: var(--accent2);
  border-color: rgba(88, 166, 255, 0.35);
}

.hr-red-flags {
  background: rgba(247, 129, 102, 0.06);
  border: 1px solid rgba(247, 129, 102, 0.25);
  border-radius: var(--radius);
  padding: 8px 12px;
  margin: 8px 0;
}

.hr-red-flags ul,
.hr-followup {
  padding-left: 1.25em;
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-top: 6px;
}

.hr-red-flags li,
.hr-followup li {
  font-size: 0.875em;
  line-height: 1.55;
  color: var(--text);
}

.hr-red-flags li::marker { color: var(--warn); }
.hr-followup li::marker { color: var(--accent2); }

.hr-nav-btn.active {
  border-left-color: var(--accent3);
  color: var(--text-head);
  background: var(--bg3);
}

.hr-card.mastered { border-left-color: var(--accent3); }

@media (max-width: 768px) {
  .hr-toolbar-extras { flex-direction: column; }
  .hr-type-btn { min-height: 40px; }
}

#vendor-panel { display: none; flex-direction: column; gap: 14px; }
#vendor-panel.active { display: flex; }

.vendor-toolbar {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.vendor-tabs {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  flex: 1;
}

.vendor-tab {
  background: var(--bg2);
  border: 1px solid var(--border);
  color: var(--text-dim);
  border-radius: var(--radius);
  padding: 6px 12px;
  font-size: 11px;
  font-family: var(--font-mono);
  cursor: pointer;
  transition: border-color 0.12s, color 0.12s, background 0.12s;
}

.vendor-tab:hover { border-color: var(--accent2); color: var(--text); }
.vendor-tab.active { border-color: var(--accent); color: var(--accent); background: rgba(63, 185, 80, 0.08); }

.vendor-layout {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 16px;
  align-items: start;
}

.vendor-layout--wide {
  grid-template-columns: 1fr;
}

.vendor-section-nav {
  display: flex;
  flex-direction: column;
  gap: 4px;
  position: sticky;
  top: 0;
}

.vendor-sec-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-dim);
  font-size: 11px;
  font-family: var(--font-body);
  cursor: pointer;
  text-align: left;
  transition: all 0.12s;
}

.vendor-sec-btn:hover { border-color: var(--accent2); color: var(--text); }
.vendor-sec-btn.active { border-color: var(--accent); color: var(--accent); background: rgba(63, 185, 80, 0.08); }

.vendor-sec-num {
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 700;
  opacity: 0.7;
}

.vendor-content { min-width: 0; display: flex; flex-direction: column; gap: 14px; }

.vendor-section-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
}

.vendor-prose p { font-size: 0.9375em; line-height: 1.7; margin-bottom: 10px; color: var(--text); }
.vendor-h3 {
  font-family: var(--font-head);
  font-size: 1.05em;
  font-weight: 600;
  color: var(--text-head);
  margin: 16px 0 8px;
  font-style: italic;
}

.vendor-table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; margin-bottom: 12px; }
.vendor-table { font-size: 0.8125em; min-width: 600px; }
.vendor-table code { font-family: var(--font-mono); font-size: 0.9em; color: var(--accent3); word-break: break-all; }
.vendor-note { font-size: 0.8125em; color: var(--text-dim); font-family: var(--font-mono); margin-top: 8px; }

.vendor-case {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-bottom: 10px;
}

.vendor-case-head {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 14px;
  cursor: pointer;
  user-select: none;
}

.vendor-case-title {
  flex: 1;
  font-size: 0.9375em;
  font-weight: 500;
  color: var(--text-head);
  line-height: 1.4;
}

.vendor-case-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

.vendor-case.open .vendor-case-body { max-height: 8000px; }
.vendor-case.open .chevron { transform: rotate(180deg); }

.vendor-case-block {
  padding: 0 14px 12px;
  border-top: 1px solid var(--border);
}

.vendor-case-block p,
.vendor-case-block ul { font-size: 0.875em; line-height: 1.65; margin-top: 6px; }
.vendor-case-block ul { padding-left: 1.25em; }

.vendor-workflow {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 14px;
  margin-bottom: 10px;
}

.vendor-steps {
  padding-left: 1.25em;
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-top: 8px;
}

.vendor-steps li { font-size: 0.875em; line-height: 1.6; color: var(--text); }
.vendor-steps li::marker { color: var(--accent2); font-weight: 700; }

.vendor-iq .qa-answer { max-height: 0; overflow: hidden; transition: max-height 0.35s cubic-bezier(0.4, 0, 0.2, 1); }
.vendor-iq.open .qa-answer { max-height: 4000px; }

.vendor-takeaways ul { padding-left: 1.25em; display: flex; flex-direction: column; gap: 6px; }
.vendor-takeaways li { font-size: 0.9375em; line-height: 1.65; }

.vendor-learning-phase {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 16px;
  margin-bottom: 12px;
  border-left: 3px solid var(--accent2);
}

.vendor-phase-num {
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 700;
  color: var(--accent2);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 4px;
}

.vendor-phase-goal { font-size: 0.875em; color: var(--text-dim); margin-bottom: 8px; }

.vendor-nav-btn.active { border-left-color: var(--accent2); }

.compare-table { min-width: 720px; width: 100%; }

.compare-table th:first-child,
.compare-table td:first-child {
  width: 18%;
  min-width: 140px;
}

.compare-table th:not(:first-child),
.compare-table td:not(:first-child) {
  min-width: 180px;
  white-space: normal;
  word-break: break-word;
  overflow-wrap: anywhere;
  line-height: 1.55;
}

@media (max-width: 768px) {
  .vendor-layout { grid-template-columns: 1fr; }
  .vendor-section-nav {
    flex-direction: row;
    flex-wrap: wrap;
    position: static;
  }
  .vendor-sec-btn { flex: 1 1 calc(50% - 4px); min-height: 44px; font-size: 10px; }
  .vendor-tab { min-height: 44px; padding: 10px 12px; }
}

#quiz-panel, #mock-panel { display: none; flex-direction: column; gap: 14px; }
#quiz-panel.active, #mock-panel.active { display: flex; }

.quiz-toolbar {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.quiz-progress {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-dim);
}

.quiz-score-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  flex: 1;
  min-width: 120px;
}

.score-track {
  flex: 1;
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  overflow: hidden;
}

.score-fill { height: 100%; background: var(--accent); transition: width 0.3s; }

.quiz-q-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 16px;
}

.quiz-q-text {
  font-size: 14px;
  color: var(--text-head);
  font-weight: 500;
  margin-bottom: 10px;
  line-height: 1.5;
}

.quiz-prompt {
  font-size: 11px;
  color: var(--text-dim);
  margin-bottom: 12px;
  font-family: var(--font-mono);
}

.quiz-opt {
  display: block;
  width: 100%;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 9px 14px;
  margin-bottom: 6px;
  font-size: 12px;
  color: var(--text);
  cursor: pointer;
  text-align: left;
  transition: border-color 0.12s;
  font-family: var(--font-body);
}

.quiz-opt:hover:not(:disabled) { border-color: var(--accent2); }
.quiz-opt.correct { border-color: var(--accent); background: rgba(63, 185, 80, 0.1); color: var(--accent); }
.quiz-opt.wrong { border-color: var(--warn); background: rgba(247, 129, 102, 0.1); color: var(--warn); }
.quiz-opt.reveal { opacity: 0.55; }
.quiz-opt:disabled { cursor: default; }

.quiz-exp {
  font-size: 11px;
  color: var(--text-dim);
  margin-top: 8px;
  padding: 8px 12px;
  background: var(--bg);
  border-radius: var(--radius);
  border-left: 2px solid var(--accent);
  line-height: 1.5;
}

.quiz-complete { text-align: center; }
.quiz-score-big {
  font-family: var(--font-mono);
  font-size: 48px;
  font-weight: 700;
  color: var(--accent);
  margin: 10px 0;
}

.quiz-score-label { font-size: 13px; color: var(--text-dim); margin-bottom: 16px; }
.quiz-next { align-self: flex-start; }

.mock-badge {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  color: var(--accent3);
  background: rgba(210, 168, 255, 0.12);
  border: 1px solid rgba(210, 168, 255, 0.3);
  border-radius: var(--radius);
  padding: 4px 8px;
}

.mock-timer {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--accent4);
  flex: 1;
}

.mock-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px;
}

.mock-instruction {
  font-size: 11px;
  color: var(--text-dim);
  margin-bottom: 14px;
  font-family: var(--font-mono);
}

.mock-q {
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 600;
  color: var(--text-head);
  line-height: 1.45;
  margin-bottom: 16px;
  font-style: italic;
}

.mock-actions { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 14px; }

.mock-answer {
  border-top: 1px solid var(--border);
  padding-top: 14px;
}

.mock-answer p { font-size: 12px; line-height: 1.65; margin-top: 8px; }

.modal {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 500;
  background: rgba(0, 0, 0, 0.7);
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.modal.open { display: flex; }

.modal-box {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  max-width: 560px;
  width: 100%;
  max-height: 80vh;
  display: flex;
  flex-direction: column;
}

.modal-head {
  display: flex;
  align-items: center;
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
  gap: 8px;
}

.modal-head h2 {
  font-family: var(--font-head);
  font-size: 16px;
  font-style: italic;
  color: var(--text-head);
  flex: 1;
}

.modal-close {
  background: none;
  border: none;
  color: var(--text-dim);
  cursor: pointer;
  font-size: 22px;
  line-height: 1;
  padding: 0 4px;
}

.modal-search { padding: 10px 12px; border-bottom: 1px solid var(--border); }

.modal-search input {
  width: 100%;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 7px 10px;
  font-size: 12px;
  font-family: var(--font-mono);
  color: var(--text);
  outline: none;
}

.modal-search input:focus { border-color: var(--accent2); }

.modal-body { overflow-y: auto; padding: 12px; }

.gloss-item { border-radius: var(--radius); padding: 7px 10px; }
.gloss-item:nth-child(odd) { background: var(--bg3); }

.gloss-term {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  color: var(--accent2);
}

.gloss-def {
  font-size: 11px;
  color: var(--text);
  margin-top: 2px;
  line-height: 1.5;
  overflow-wrap: break-word;
}

.empty-gloss { font-size: 12px; color: var(--text-dim); text-align: center; padding: 20px; }

.param-table { width: 100%; border-collapse: collapse; font-size: 11px; }

.param-table th {
  font-family: var(--font-mono);
  font-size: 9px;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 4px 8px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

.param-table td {
  padding: 5px 8px;
  border-bottom: 1px solid rgba(48, 54, 61, 0.5);
  color: var(--text);
  vertical-align: top;
  overflow-wrap: break-word;
}

.param-table tr:last-child td { border-bottom: none; }
.param-table .val { font-family: var(--font-mono); color: var(--accent); }

.empty-state { text-align: center; padding: 60px 20px; color: var(--text-dim); font-size: 13px; }
.empty-state .big { font-family: var(--font-mono); font-size: 32px; margin-bottom: 8px; }

.footer {
  border-top: 1px solid var(--border);
  background: var(--bg2);
  padding: 12px 20px;
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  margin: 0 -20px -20px;
}

.footer-tip { font-size: 11px; color: var(--text-dim); flex: 1; }
.footer-tip strong { color: var(--accent4); }
.footer-meta {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 2px;
  flex-shrink: 0;
}
.footer-credit {
  font-family: var(--font-mono);
  font-size: 9px;
  color: var(--text-dim);
  white-space: nowrap;
}
.footer-credit strong { color: var(--text-head); font-weight: 600; }
.version { font-family: var(--font-mono); font-size: 9px; color: var(--text-dim); }

.install-body { padding: 8px 16px 24px; display: flex; flex-direction: column; gap: 14px; }
.install-lead { font-size: 13px; color: var(--text); line-height: 1.55; }
.install-steps { list-style: none; display: flex; flex-direction: column; gap: 12px; counter-reset: step; }
.install-steps li {
  counter-increment: step;
  font-size: 13px;
  color: var(--text);
  line-height: 1.5;
  padding-left: 36px;
  position: relative;
}
.install-steps li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 0;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: rgba(63, 185, 80, 0.15);
  border: 1px solid rgba(63, 185, 80, 0.4);
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}
.install-note {
  font-size: 11px;
  color: var(--text-dim);
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 10px 12px;
  line-height: 1.5;
}
.install-note strong { color: var(--accent4); }
.mobile-more-install { grid-column: 1 / -1; border-color: rgba(63, 185, 80, 0.4); color: var(--accent); font-weight: 600; }

/* ── Reading settings (font size + style) ── */
#main {
  font-size: calc(var(--content-base) * var(--text-scale));
}

#main .section-title { font-size: 1.125em; }
#main .quiz-q-text { font-size: 1.0625em; }
#main .quiz-opt { font-size: 0.9375em; }
#main .quiz-exp { font-size: 0.875em; }
#main .mock-q { font-size: 1.25em; }
#main .mock-answer p { font-size: 0.9375em; }
#main .mock-instruction { font-size: 0.8125em; }
#main .why-box p { font-size: 0.875em; }
#main .footer-tip { font-size: 0.8125em; }
#main .param-table { font-size: 0.8125em; }

.modal-body,
.install-body {
  font-size: calc(15px * var(--text-scale));
  line-height: 1.65;
}

.gloss-def { font-size: 1em; line-height: 1.6; }

.settings-body {
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  overflow-y: auto;
}

.settings-group { display: flex; flex-direction: column; gap: 8px; }

.settings-label {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  color: var(--text-dim);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.settings-segment {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.settings-segment-btn {
  flex: 1;
  min-width: 64px;
  min-height: 44px;
  padding: 8px 10px;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 13px;
  cursor: pointer;
  transition: border-color 0.12s, background 0.12s, color 0.12s;
}

.settings-segment-btn:hover { border-color: var(--accent2); }
.settings-segment-btn.active {
  border-color: var(--accent);
  background: rgba(63, 185, 80, 0.12);
  color: var(--accent);
  font-weight: 600;
}

.settings-font-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.settings-font-btn {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 4px;
  min-height: 64px;
  padding: 10px 12px;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  cursor: pointer;
  text-align: left;
  transition: border-color 0.12s, background 0.12s;
}

.settings-font-btn:hover { border-color: var(--accent2); }
.settings-font-btn.active {
  border-color: var(--accent);
  background: rgba(63, 185, 80, 0.1);
}

.settings-font-name {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-head);
}

.settings-font-sample {
  font-size: calc(14px * var(--text-scale));
  color: var(--text-dim);
  line-height: 1.4;
}

.settings-preview {
  padding: 14px;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  font-size: calc(var(--content-base) * var(--text-scale));
  line-height: 1.65;
}

.settings-preview-q {
  font-family: var(--font-head);
  font-weight: 600;
  color: var(--text-head);
  margin-bottom: 8px;
}

.settings-preview-a { color: var(--text); }

.font-sample-default { font-family: "DM Sans", sans-serif; }
.font-sample-serif { font-family: "Lora", Georgia, serif; }
.font-sample-inter { font-family: "Inter", sans-serif; }
.font-sample-system { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; }
.font-sample-ubuntu { font-family: "Ubuntu", sans-serif; }
.font-sample-fraunces { font-family: "Fraunces", serif; }
.font-sample-jetbrains { font-family: "JetBrains Mono", monospace; }
.font-sample-space-grotesk { font-family: "Space Grotesk", sans-serif; }

.offline-toast {
  position: fixed;
  left: 50%;
  transform: translateX(-50%);
  bottom: calc(var(--bottom-nav-h) + 12px);
  z-index: 400;
  background: var(--bg2);
  border: 1px solid var(--accent);
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 8px 14px;
  border-radius: 20px;
  box-shadow: var(--shadow);
  pointer-events: none;
}

@media (min-width: 769px) {
  .offline-toast { bottom: 20px; }
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: none; }
}

@media print {
  body { background: white; color: #000; }
  #navbar, #sidebar, .sidebar-backdrop, .bottom-nav, .toolbar, .card-actions, .chevron, #quiz-panel, #mock-panel, #vendor-panel, .footer, #mobile-more-modal, #settings-modal { display: none !important; }
  .app-grid { display: block; }
  #main { overflow: visible; padding: 0; }
  .qa-card { break-inside: avoid; border: 1px solid #ccc; margin-bottom: 8px; page-break-inside: avoid; }
  .qa-answer { max-height: none !important; }
  .qa-card .qa-answer { max-height: none; }
}