/* ============================================
   2026 软考高项 · 核心知识点背诵手册
   Design: Clean professional with warm undertones
   ============================================ */

/* ---- FONTS ---- */
@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@300;400;500;600&family=JetBrains+Mono:wght@300;400;500&display=swap');

/* ---- CSS VARIABLES ---- */
:root {
  --bg: #faf9f7;
  --bg-surface: #f3f1ee;
  --bg-card: #ffffff;
  --bg-hover: #f0eeea;
  --border: #e5e1da;
  --border-strong: #d4cfc7;
  --text-primary: #1c1917;
  --text-secondary: #5c5650;
  --text-muted: #8b8580;
  --text-disabled: #bab5af;
  --accent: #2563eb;
  --accent-light: #eff3ff;
  --accent-subtle: #f5f7fc;
  --green: #16a34a;
  --green-bg: #f0fdf4;
  --red: #dc2626;
  --red-bg: #fef2f2;
  --font-mono: 'JetBrains Mono', ui-monospace, 'SFMono-Regular', 'Courier New', monospace;
  --font-sans: 'Noto Sans SC', system-ui, -apple-system, sans-serif;
  --sidebar-w: 240px;
  --topnav-h: 56px;
  --radius: 4px;
  --radius-sm: 3px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
  --shadow-card: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
}

/* ---- RESET ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; -webkit-text-size-adjust: 100%; }
body {
  background: var(--bg);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
a { color: var(--text-primary); text-decoration: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
table { border-collapse: collapse; width: 100%; }

/* ---- TOP NAV ---- */
.topnav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--topnav-h);
  background: rgba(250,249,247,0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 28px;
  gap: 16px;
  z-index: 100;
}
.topnav-brand {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 1.4px;
  text-transform: uppercase;
  color: var(--text-primary);
  white-space: nowrap;
  flex-shrink: 0;
}
.topnav-center {
  flex: 1;
  max-width: 420px;
  margin: 0 auto;
}
.search-input {
  width: 100%;
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 14px;
  padding: 9px 16px;
  border-radius: var(--radius);
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.search-input::placeholder { color: var(--text-disabled); }
.search-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(37,99,235,0.1);
}
.topnav-right {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-shrink: 0;
  margin-left: auto;
}
.progress-label {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-muted);
  letter-spacing: 0.5px;
}
.btn-ghost {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  color: var(--text-primary);
  border: 1px solid var(--border-strong);
  padding: 7px 18px;
  border-radius: var(--radius);
  transition: background 0.15s, border-color 0.15s;
}
.btn-ghost:hover { background: var(--bg-hover); border-color: var(--text-muted); }
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 4px;
  margin-left: auto;
}
.hamburger span {
  display: block;
  width: 22px;
  height: 1.5px;
  background: var(--text-primary);
  border-radius: 1px;
  transition: opacity 0.2s;
}

/* ---- LAYOUT ---- */
.layout {
  display: flex;
  padding-top: var(--topnav-h);
  min-height: 100vh;
}

/* ---- SIDEBAR ---- */
.sidebar {
  width: var(--sidebar-w);
  flex-shrink: 0;
  position: fixed;
  top: var(--topnav-h);
  left: 0;
  bottom: 0;
  overflow-y: auto;
  border-right: 1px solid var(--border);
  background: var(--bg-card);
  z-index: 90;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}
.sidebar::-webkit-scrollbar { width: 4px; }
.sidebar::-webkit-scrollbar-track { background: transparent; }
.sidebar::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }
.sidebar-inner { padding: 20px 0 48px; }
.sidenav { display: flex; flex-direction: column; gap: 2px; }
.sidenav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 20px;
  margin: 0 8px;
  font-size: 14px;
  color: var(--text-secondary);
  border-left: 2px solid transparent;
  border-radius: 0 var(--radius) var(--radius) 0;
  transition: color 0.15s, border-color 0.15s, background 0.15s;
}
.sidenav-item:hover { color: var(--text-primary); background: var(--bg-surface); }
.sidenav-item.active {
  color: var(--text-primary);
  border-left-color: var(--accent);
  background: var(--accent-subtle);
  font-weight: 500;
}
.sidenav-icon { font-size: 15px; flex-shrink: 0; }
.sidenav-sub-group {
  display: flex;
  flex-direction: column;
  gap: 1px;
  border-left: 1px solid var(--border);
  margin-left: 36px;
  margin-bottom: 6px;
  margin-right: 8px;
}
.sidenav-sub {
  padding: 7px 16px;
  font-size: 12px;
  color: var(--text-muted);
  border-radius: 0 var(--radius) var(--radius) 0;
  transition: color 0.15s, background 0.15s;
}
.sidenav-sub:hover { color: var(--text-primary); background: var(--bg-surface); }
.sidenav-sub.active { color: var(--accent); font-weight: 500; }

/* ---- MAIN CONTENT ---- */
.main-content {
  margin-left: var(--sidebar-w);
  flex: 1;
  max-width: 1440px;
  padding: 0 48px 96px;
  margin-right: auto;
}

/* ---- HERO SECTION ---- */
.hero-section {
  padding: 80px 0 64px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 72px;
}
.hero-tag {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 1.6px;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 28px;
  border: 1px solid var(--border);
  display: inline-block;
  padding: 5px 12px;
  border-radius: var(--radius-sm);
  background: var(--bg-card);
}
.hero-title {
  font-family: var(--font-sans);
  font-size: clamp(44px, 7vw, 80px);
  font-weight: 500;
  line-height: 1.08;
  color: var(--text-primary);
  margin-bottom: 24px;
  letter-spacing: -1.5px;
}
.hero-sub {
  font-size: 18px;
  color: var(--text-secondary);
  margin-bottom: 12px;
  font-weight: 400;
}
.hero-desc {
  font-size: 15px;
  color: var(--text-muted);
  max-width: 580px;
  line-height: 1.75;
  margin-bottom: 48px;
}
.hero-stats {
  display: flex;
  align-items: center;
  gap: 0;
  flex-wrap: wrap;
}
.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 18px 36px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}
.stat-item + .stat-item { margin-left: -1px; border-left: 1px solid var(--border); }
.stat-item:first-child { border-radius: var(--radius) 0 0 var(--radius); }
.stat-item:last-child { border-radius: 0 var(--radius) var(--radius) 0; }
.stat-num {
  font-family: var(--font-mono);
  font-size: 34px;
  font-weight: 500;
  color: var(--accent);
  line-height: 1;
}
.stat-label {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 6px;
  letter-spacing: 0.5px;
}
.stat-divider { display: none; }

/* ---- CONTENT SECTIONS ---- */
.content-section {
  margin-bottom: 88px;
  scroll-margin-top: calc(var(--topnav-h) + 24px);
}
.section-header { margin-bottom: 44px; }
.section-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 2.5px;
  text-transform: uppercase;
  color: var(--text-disabled);
  margin-bottom: 12px;
}
.section-title {
  font-size: 28px;
  font-weight: 500;
  color: var(--text-primary);
  line-height: 1.25;
  margin-bottom: 16px;
}
.section-note {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.65;
  border-left: 3px solid var(--accent);
  padding-left: 14px;
  margin-top: 12px;
  background: var(--accent-subtle);
  padding: 12px 16px;
  border-radius: 0 var(--radius) var(--radius) 0;
}
.mnemonic-card {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  background: var(--bg-card);
  border: 1px solid var(--border-strong);
  padding: 10px 22px;
  border-radius: var(--radius);
  margin-top: 8px;
  box-shadow: var(--shadow-sm);
}
.mnemonic-label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  color: var(--text-muted);
}
.mnemonic-text {
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 500;
  color: var(--text-primary);
  letter-spacing: 2px;
}

/* ---- PROCESS MATRIX (49个过程映射) ---- */
.process-matrix-container {
  margin: 24px 0 36px;
}
.matrix-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
  flex-wrap: wrap;
  gap: 12px;
}
.matrix-mode-group {
  display: flex;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  overflow: hidden;
}
.matrix-mode-btn {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 1px;
  padding: 7px 18px;
  color: var(--text-secondary);
  background: var(--bg-card);
  border: none;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
  min-height: 36px;
}
.matrix-mode-btn:first-child { border-right: 1px solid var(--border-strong); }
.matrix-mode-btn:hover { background: var(--bg-hover); }
.matrix-mode-btn.active {
  background: var(--accent);
  color: #fff;
}
.matrix-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 12px;
  background: var(--bg-card);
  border-radius: var(--radius);
  overflow: hidden;
}
.matrix-table th, .matrix-table td {
  border: 1px solid var(--border);
  padding: 9px 12px;
  text-align: center;
  vertical-align: middle;
  line-height: 1.5;
}
.matrix-table thead th {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  color: var(--text-muted);
  font-weight: 500;
  background: var(--bg-surface);
  padding: 12px 10px;
}
.matrix-table thead th:first-child {
  background: var(--bg);
}
.matrix-table tbody th {
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 500;
  color: var(--text-primary);
  text-align: left;
  background: var(--bg-surface);
  padding: 12px 14px;
  white-space: nowrap;
  min-width: 70px;
}
.matrix-table tbody td {
  color: var(--text-secondary);
  transition: background 0.15s;
}
.matrix-table tbody td:hover {
  background: var(--accent-subtle);
}
.matrix-table .cell-process-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.matrix-table .cell-process-list li {
  padding: 3px 0 3px 14px;
  font-size: 12px;
  color: var(--text-secondary);
  position: relative;
  line-height: 1.5;
  text-align: left;
}
.matrix-table .cell-process-list li::before {
  content: '·';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: 700;
}
.quiz-cell-btn .cell-process-list li { color: inherit; font-size: 11px; padding: 1px 0 1px 12px; }
.matrix-table .cell-empty {
  color: var(--text-disabled);
  font-size: 10px;
}
.matrix-table.quiz-mode tbody td {
  vertical-align: middle;
  cursor: pointer;
}
.quiz-cell-btn {
  display: block;
  width: 100%;
  padding: 10px 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-muted);
  background: var(--bg-surface);
  border: 1px dashed var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
  min-height: 36px;
}
.quiz-cell-btn:hover {
  color: var(--text-primary);
  background: var(--accent-subtle);
  border-color: var(--accent);
}
.quiz-cell-btn.filled {
  color: var(--text-primary);
  border-style: solid;
  background: var(--bg-card);
  border-color: var(--border-strong);
}
.quiz-cell-btn.correct {
  color: var(--green);
  border-color: var(--green);
  background: var(--green-bg);
}
.quiz-cell-btn.wrong {
  color: var(--red);
  border-color: var(--red);
  background: var(--red-bg);
}
.quiz-submit-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 16px;
  flex-wrap: wrap;
}
.quiz-score {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--text-primary);
  flex: 1;
}
.quiz-submit-btn, .quiz-reset-btn {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 1px;
  padding: 9px 22px;
  cursor: pointer;
  min-height: 44px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  background: var(--bg-card);
  color: var(--text-primary);
  transition: background 0.15s, opacity 0.15s;
}
.quiz-submit-btn:hover, .quiz-reset-btn:hover { background: var(--bg-hover); }
.quiz-submit-btn {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.quiz-submit-btn:hover { opacity: 0.88; background: var(--accent); }
.quiz-mastered-badge {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--green);
  border: 1px solid var(--green);
  padding: 6px 14px;
  border-radius: var(--radius);
  letter-spacing: 1px;
}

/* ---- QUIZ MODAL ---- */
.quiz-modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.4);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 300;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
#quizModalOverlay { z-index: 310; }
.quiz-modal-overlay.open { display: flex; }
.quiz-modal {
  background: var(--bg-card);
  border: 1px solid var(--border-strong);
  border-radius: 6px;
  width: 100%;
  max-width: 520px;
  max-height: 80vh;
  display: flex;
  flex-direction: column;
  box-shadow: 0 8px 30px rgba(0,0,0,0.12);
}
.quiz-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 24px;
  border-bottom: 1px solid var(--border);
}
.quiz-modal-title {
  font-size: 16px;
  font-weight: 500;
  color: var(--text-primary);
}
.quiz-modal-close {
  font-size: 20px;
  color: var(--text-muted);
  background: none;
  border: none;
  cursor: pointer;
  min-width: 44px;
  min-height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius);
  transition: color 0.15s, background 0.15s;
}
.quiz-modal-close:hover { color: var(--text-primary); background: var(--bg-hover); }
.quiz-modal-body {
  padding: 24px;
  flex: 1;
  overflow-y: auto;
}
.quiz-modal-hint {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 16px;
  line-height: 1.5;
}
.quiz-input-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 10px;
}
.quiz-input-row {
  display: flex;
  align-items: center;
  gap: 8px;
}
.quiz-input-field {
  flex: 1;
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 14px;
  padding: 11px 14px;
  border-radius: var(--radius);
  outline: none;
  min-height: 44px;
  line-height: 1.4;
  transition: border-color 0.15s, box-shadow 0.15s;
}
.quiz-input-field:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(37,99,235,0.08);
}
.quiz-input-field::placeholder { color: var(--text-disabled); }
.quiz-remove-btn {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-muted);
  cursor: pointer;
  font-size: 18px;
  flex-shrink: 0;
  transition: color 0.15s, border-color 0.15s, background 0.15s;
}
.quiz-remove-btn:hover { color: var(--red); border-color: var(--red); background: var(--red-bg); }
.quiz-add-btn {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.5px;
  color: var(--text-muted);
  background: var(--bg);
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  padding: 11px 16px;
  cursor: pointer;
  width: 100%;
  min-height: 44px;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}
.quiz-add-btn:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-subtle);
}

/* ---- KA ITTO QUIZ TABLE ---- */
.ka-quiz-table-wrapper {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}
.ka-quiz-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 12px;
  background: var(--bg-card);
}
.ka-quiz-table th, .ka-quiz-table td {
  border: 1px solid var(--border);
  padding: 9px 12px;
  vertical-align: top;
  text-align: left;
}
.ka-quiz-table thead th {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  color: var(--text-muted);
  font-weight: 500;
  background: var(--bg-surface);
  white-space: nowrap;
}
.ka-quiz-table tbody th {
  font-weight: 500;
  color: var(--text-primary);
  background: var(--bg-surface);
  white-space: nowrap;
  min-width: 85px;
  font-size: 12px;
}
.ka-quiz-input {
  width: 100%;
  min-width: 120px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 12px;
  padding: 7px 10px;
  outline: none;
  resize: vertical;
  min-height: 34px;
  line-height: 1.5;
  transition: border-color 0.15s;
}
.ka-quiz-input:focus { border-color: var(--accent); }
.ka-quiz-input::placeholder { color: var(--text-disabled); font-size: 11px; }
.ka-quiz-input.correct {
  border-color: var(--green);
  background: var(--green-bg);
}
.ka-quiz-input.wrong {
  border-color: var(--red);
  background: var(--red-bg);
}
#kaQuizBody {
  padding: 20px;
  max-height: 60vh;
  overflow-y: auto;
}
@media (max-width: 768px) {
  #kaQuizBody { padding: 14px; }
  .ka-quiz-table th, .ka-quiz-table td { padding: 6px; }
  .ka-quiz-input { min-width: 80px; font-size: 11px; }
  .ka-quiz-table thead th { font-size: 10px; }
}
.quiz-modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 12px;
  padding: 18px 24px;
  border-top: 1px solid var(--border);
}
.quiz-modal-cancel, .quiz-modal-confirm {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 1px;
  padding: 10px 24px;
  cursor: pointer;
  min-height: 44px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  transition: background 0.15s, opacity 0.15s;
}
.quiz-modal-cancel {
  background: var(--bg-card);
  color: var(--text-primary);
}
.quiz-modal-cancel:hover { background: var(--bg-hover); }
.quiz-modal-confirm {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.quiz-modal-confirm:hover { opacity: 0.88; }

/* ---- KA QUIZ AUTO ITEMS ---- */
.ka-auto-item {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-disabled);
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 2px 8px;
  margin: 2px 4px 2px 0;
  letter-spacing: 0.3px;
}

/* ---- KA QUIZ CARD LAYOUT ---- */
.ka-quiz-cards { display:flex; flex-direction:column; gap:16px; }
.ka-proc-card {
  border:1px solid var(--border);
  border-radius:var(--radius);
  background:var(--bg-card);
  box-shadow:var(--shadow-sm);
}
.ka-proc-card.ka-proc-done { border-color:rgba(22,163,74,0.3); background:var(--green-bg); }
.ka-proc-card.ka-proc-focused { border-color:var(--accent); box-shadow:0 0 0 3px rgba(37,99,235,0.1); }
.ka-proc-header {
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding:14px 18px;
  border-bottom:1px solid var(--border);
  flex-wrap:wrap;
  gap:8px;
}
.ka-proc-name { font-size:15px; font-weight:500; color:var(--text-primary); }
.ka-proc-status { font-family:var(--font-mono); font-size:11px; letter-spacing:1px; }
.ka-proc-status.done { color:var(--green); }
.ka-proc-status.fail { color:var(--red); }
.ka-proc-col { padding:12px 18px; border-bottom:1px solid var(--border); }
.ka-proc-col:last-child { border-bottom:none; }
.ka-proc-col-label {
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:1.2px;
  color:var(--text-muted);
  margin-bottom:10px;
  text-transform:uppercase;
}
.ka-proc-items { display:flex; flex-wrap:wrap; gap:6px; align-items:center; }
.ka-chip {
  display:inline-flex;
  align-items:center;
  gap:4px;
  font-family:var(--font-mono);
  font-size:11px;
  color:var(--text-muted);
  background:var(--bg);
  border:1px dashed var(--border);
  border-radius:var(--radius-sm);
  padding:7px 14px;
  cursor:pointer;
  transition:all 0.15s;
  min-height:38px;
  white-space:nowrap;
}
.ka-chip:hover { border-color:var(--accent); color:var(--accent); background:var(--accent-subtle); }
.ka-chip.ka-chip-done { border-style:solid; color:var(--text-primary); background:var(--bg-card); border-color:var(--border-strong); }
.ka-chip.ka-chip-correct { border-color:var(--green); color:var(--green); background:var(--green-bg); border-style:solid; }
.ka-chip.ka-chip-wrong { border-color:var(--red); color:var(--red); background:var(--red-bg); border-style:solid; }
.ka-proc-grade-bar { padding:12px 18px; display:flex; gap:8px; align-items:center; }
.ka-proc-reset-btn {
  font-family:var(--font-mono); font-size:11px; letter-spacing:1px;
  padding:9px 18px; min-height:40px; cursor:pointer;
  border:1px solid var(--border-strong); border-radius:var(--radius);
  background:var(--bg-card); color:var(--text-primary);
  transition:background 0.15s;
}
.ka-proc-reset-btn:hover { background:var(--bg-hover); }
.ka-proc-grade-btn {
  font-family:var(--font-mono); font-size:11px; letter-spacing:1px;
  padding:9px 26px; min-height:40px; cursor:pointer;
  border:1px solid var(--accent); border-radius:var(--radius);
  background:var(--accent); color:#fff;
  transition:opacity 0.15s;
}
.ka-proc-grade-btn:hover { opacity:0.88; }

/* ---- PRINCIPLES GRID ---- */
.principles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 16px;
}
.principle-card {
  background: var(--bg-card);
  padding: 28px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color 0.2s, box-shadow 0.2s, background 0.2s;
  cursor: pointer;
  position: relative;
  box-shadow: var(--shadow-sm);
}
.principle-card:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-card);
}
.principle-card.memorized {
  background: var(--accent-subtle);
  border-color: rgba(37,99,235,0.2);
}

/* ---- MEMORIZED TOGGLE BADGE ---- */
.memorized-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 1px;
  color: var(--text-muted);
  padding: 4px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  transition: all 0.15s;
  white-space: nowrap;
  flex-shrink: 0;
  background: var(--bg-card);
}
.memorized-badge:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-subtle);
}
.memorized-badge.done {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-light);
}
.memorized-badge.done:hover {
  color: var(--text-primary);
  border-color: var(--border-strong);
  background: var(--bg-hover);
}

@media (max-width: 768px) {
  .memorized-badge { font-size: 10px; padding: 3px 10px; }
}
@media (max-width: 480px) {
  .memorized-badge { font-size: 9px; padding: 3px 8px; }
}
.ka-header-left { flex-shrink: 0; }
@media (max-width: 600px) {
  .ka-header-left { flex: 1 1 100%; }
  .memorized-badge { margin-left: auto !important; margin-right: 8px !important; }
}

.principle-card.memorized::after {
  content: '✓';
  position: absolute;
  top: 16px;
  right: 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--accent);
  font-weight: 500;
}
.principle-num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-disabled);
  letter-spacing: 1.2px;
  margin-bottom: 10px;
}
.principle-title {
  font-size: 16px;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 10px;
  line-height: 1.4;
}
.principle-body {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ---- PROCESS GROUPS ---- */
.process-groups-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.pg-item {
  background: var(--bg-card);
  padding: 28px 32px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  display: grid;
  grid-template-columns: 130px 1fr 1fr;
  gap: 28px;
  align-items: start;
  transition: border-color 0.2s, box-shadow 0.2s;
  box-shadow: var(--shadow-sm);
}
.pg-item:hover { border-color: var(--border-strong); box-shadow: var(--shadow-card); }
.pg-item.memorized { background: var(--accent-subtle); border-color: rgba(37,99,235,0.2); }
.pg-num-label {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.pg-num {
  font-family: var(--font-mono);
  font-size: 32px;
  font-weight: 400;
  color: var(--accent);
  line-height: 1;
}
.pg-name {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  color: var(--text-muted);
}
.pg-main h3 {
  font-size: 18px;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 8px;
}
.pg-main p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 10px;
}
.pg-processes {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-muted);
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 7px 14px;
  display: inline-block;
}
.pg-analogy {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.7;
  border-left: 3px solid var(--accent);
  padding-left: 18px;
  background: var(--accent-subtle);
  padding: 14px 18px;
  border-radius: 0 var(--radius) var(--radius) 0;
}
.pg-analogy strong {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 8px;
  font-weight: 500;
}

/* ---- COMMON DOCS ---- */
.common-docs-content { display: flex; flex-direction: column; gap: 16px; }
.doc-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 32px;
  transition: border-color 0.2s, box-shadow 0.2s;
  box-shadow: var(--shadow-sm);
}
.doc-card:hover { border-color: var(--border-strong); box-shadow: var(--shadow-card); }
.doc-card-title {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 16px;
}
.flow-chain {
  display: flex;
  align-items: center;
  gap: 0;
  flex-wrap: wrap;
  margin-bottom: 20px;
}
.flow-step {
  background: var(--bg-surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  padding: 9px 18px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-primary);
  font-weight: 500;
}
.flow-arrow {
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--text-disabled);
  padding: 0 8px;
}
.flow-items { display: flex; flex-direction: column; gap: 14px; }
.flow-item { display: flex; gap: 16px; align-items: start; }
.flow-item-label {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-primary);
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 4px 10px;
  white-space: nowrap;
  flex-shrink: 0;
  min-width: 130px;
  text-align: center;
}
.flow-item-desc {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.65;
}
.doc-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.doc-grid-item h4 {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 8px;
  font-weight: 500;
}
.doc-grid-item p { font-size: 14px; color: var(--text-secondary); line-height: 1.65; }
.doc-grid-item strong { color: var(--text-primary); }
.plan-components { display: flex; flex-direction: column; gap: 10px; }
.plan-row { display: flex; gap: 12px; align-items: center; }
.plan-badge {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--text-primary);
  background: var(--bg-surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  padding: 4px 12px;
  white-space: nowrap;
  flex-shrink: 0;
}
.plan-desc { font-size: 13px; color: var(--text-secondary); }

/* ---- KNOWLEDGE AREA BLOCKS ---- */
.ka-block {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 12px;
  scroll-margin-top: calc(var(--topnav-h) + 24px);
  box-shadow: var(--shadow-sm);
  transition: border-color 0.2s, box-shadow 0.2s;
}
.ka-block:hover { border-color: var(--border-strong); }
.ka-block.memorized {
  background: var(--accent-subtle);
  border-color: rgba(37,99,235,0.2);
}
.ka-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 22px 28px;
  cursor: pointer;
  transition: background 0.15s;
  user-select: none;
  flex-wrap: wrap;
  gap: 12px;
  border-radius: var(--radius);
}
.ka-header:hover { background: var(--bg-surface); }
.ka-header-left { display: flex; align-items: center; gap: 20px; }
.ka-num {
  font-family: var(--font-mono);
  font-size: 28px;
  font-weight: 400;
  color: var(--accent);
  line-height: 1;
  flex-shrink: 0;
}
.ka-title {
  font-size: 18px;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 4px;
}
.ka-subtitle {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.45;
}
.ka-toggle {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--text-muted);
  transition: transform 0.25s, color 0.15s;
  flex-shrink: 0;
  min-width: 44px;
  min-height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius);
}
.ka-toggle:hover { color: var(--accent); background: var(--bg-hover); }
.ka-progress-label {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-muted);
  margin-left: auto;
  margin-right: 8px;
  flex-shrink: 0;
  letter-spacing: 0.5px;
}
.ka-progress-label.done {
  color: var(--green);
}
.ka-block.collapsed .ka-toggle { transform: rotate(-90deg); }
.ka-body {
  border-top: 1px solid var(--border);
  overflow: visible;
}
.ka-block.collapsed .ka-body { display: none; }

/* ---- ITTO EXPANDABLE TABLE ---- */
.itto-row-clickable { cursor: pointer; }
.itto-row-clickable:hover td { background: var(--accent-subtle); }
.itto-detail-row td { padding: 0 !important; background: var(--bg-surface); }
.itto-detail-content {
  padding: 22px 28px;
  border-top: 1px solid var(--border);
  font-size: 13px;
  line-height: 1.7;
  overflow-wrap: break-word;
  word-break: break-word;
  min-width: 0;
}
.itto-detail-section { margin-bottom: 14px; }
.itto-detail-pg {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 1.2px;
  color: var(--accent);
  text-transform: uppercase;
  font-weight: 500;
}
.itto-detail-explain { color: var(--text-secondary); margin-bottom: 18px; line-height: 1.75; overflow-wrap: break-word; word-break: break-word; }
.itto-detail-items { display: flex; flex-direction: column; gap: 12px; margin-bottom: 18px; }
.itto-detail-item {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: 8px;
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
}
.itto-detail-item:last-child { border-bottom: none; }
.itto-detail-term {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  color: var(--text-primary);
  min-width: 0;
  overflow-wrap: break-word;
  word-break: break-word;
}
.itto-detail-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.3px;
  color: var(--accent);
  border: 1px solid rgba(37,99,235,0.2);
  border-radius: var(--radius-sm);
  padding: 2px 10px;
  background: var(--accent-subtle);
  white-space: nowrap;
}
.itto-detail-desc {
  font-size: 13px;
  color: var(--text-secondary);
  flex: 1;
  min-width: 0;
  overflow-wrap: break-word;
  word-break: break-word;
}
.itto-detail-tips { border-top: 1px solid var(--border); padding-top: 16px; margin-top: 8px; }
.itto-detail-tips-title {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 10px;
  font-weight: 500;
}
.itto-detail-tip { font-size: 12px; color: var(--text-muted); padding: 4px 0; line-height: 1.6; }

@media (max-width: 480px) {
  .itto-detail-content { padding: 14px; }
  .itto-detail-term { font-size: 11px; }
  .itto-detail-desc { font-size: 12px; }
  .itto-detail-item { flex-direction: column; gap: 4px; }
  .itto-detail-explain { font-size: 12px; }
  .itto-detail-tip { font-size: 11px; }
}

/* ---- ITTO TABLE ---- */
.table-wrapper {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}
.table-wrapper::-webkit-scrollbar { height: 5px; }
.table-wrapper::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
.itto-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--bg-card);
}
.itto-table thead tr {
  border-bottom: 2px solid var(--border-strong);
}
.itto-table th {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  color: var(--text-muted);
  font-weight: 500;
  padding: 14px 18px;
  text-align: left;
  white-space: nowrap;
  background: var(--bg-surface);
}
.itto-table td {
  padding: 14px 18px;
  font-size: 13px;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border);
  vertical-align: top;
  line-height: 1.65;
}
.itto-table tr:last-child td { border-bottom: none; }
.itto-table tbody tr:hover td { background: var(--accent-subtle); }
.itto-table td:first-child {
  color: var(--text-primary);
  font-weight: 500;
  white-space: nowrap;
}
.itto-table td:nth-child(2) {
  color: var(--text-secondary);
  font-size: 13px;
  min-width: 180px;
}
.process-tag {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.5px;
  color: var(--text-primary);
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 3px 8px;
  display: inline-block;
  margin-bottom: 4px;
  font-weight: 500;
}
.row-quiz-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  font-size: 16px;
  color: var(--accent);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-card);
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s, box-shadow 0.15s;
}
.row-quiz-btn:hover {
  border-color: var(--accent);
  background: var(--accent-subtle);
  box-shadow: 0 0 0 3px rgba(37,99,235,0.1);
}
.row-quiz-btn.mastered {
  color: var(--green);
  border-color: var(--green);
  background: var(--green-bg);
}
.row-quiz-btn.mastered:hover {
  color: var(--red);
  border-color: var(--red);
  background: var(--red-bg);
  box-shadow: 0 0 0 3px rgba(239,68,68,0.1);
}
/* Mobile quiz button — hidden on desktop, shown on mobile */
.mobile-quiz-btn {
  display: none;
}
/* Hide expand hint on desktop */
.itto-row-clickable::after { display: none; }

/* ---- ITTO NOTES ---- */
.itto-notes {
  padding: 24px 28px;
  border-top: 1px solid var(--border);
  background: var(--bg-surface);
}
.itto-notes-title {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 1.4px;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 16px;
  font-weight: 500;
}
.note-items { display: flex; flex-direction: column; gap: 14px; }
.note-item { display: flex; gap: 16px; align-items: start; }
.note-term {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-primary);
  background: var(--bg-card);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  padding: 4px 12px;
  white-space: nowrap;
  flex-shrink: 0;
  min-width: 170px;
}
.note-type {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-disabled);
  letter-spacing: 0.5px;
}
.note-desc {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.7;
}
.note-desc strong { color: var(--text-primary); font-weight: 500; }

/* ---- FILE FLOW TABLE ---- */
.flow-cell {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-secondary);
}

/* ---- PERFORMANCE DOMAINS ---- */
.pd-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: 16px;
}
.pd-card {
  background: var(--bg-card);
  padding: 28px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color 0.2s, box-shadow 0.2s;
  box-shadow: var(--shadow-sm);
}
.pd-card:hover { border-color: var(--border-strong); box-shadow: var(--shadow-card); }
.pd-card.memorized { background: var(--accent-subtle); border-color: rgba(37,99,235,0.2); }
.pd-num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 1.2px;
  color: var(--text-disabled);
  margin-bottom: 12px;
}
.pd-title {
  font-size: 18px;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 18px;
  line-height: 1.35;
}
.pd-section-label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 1.4px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 8px;
  margin-top: 16px;
  font-weight: 500;
}
.pd-goals { list-style: none; }
.pd-goals li {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.65;
  padding: 5px 0 5px 16px;
  border-bottom: 1px solid var(--border);
  position: relative;
}
.pd-goals li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: var(--text-disabled);
  font-family: var(--font-mono);
}
.pd-goals li:last-child { border-bottom: none; }
.pd-action {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.75;
  margin-top: 4px;
}
.pd-action strong { color: var(--text-secondary); font-weight: 500; }

/* ---- SEARCH OVERLAY ---- */
.search-overlay {
  display: none;
  position: fixed;
  top: var(--topnav-h);
  left: var(--sidebar-w);
  right: 0;
  background: rgba(250,249,247,0.98);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-top: 1px solid var(--border);
  box-shadow: 0 4px 20px rgba(0,0,0,0.06);
  z-index: 80;
  max-height: 60vh;
  overflow-y: auto;
}
.search-overlay.active { display: block; }
.search-results { padding: 8px 24px; }
.search-result-item {
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
  cursor: pointer;
  transition: background 0.15s;
  border-radius: var(--radius);
  margin: 2px 0;
}
.search-result-item:hover { background: var(--accent-subtle); }
.search-result-item:last-child { border-bottom: none; }
.sr-section {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  color: var(--text-disabled);
  margin-bottom: 4px;
}
.sr-title { font-size: 14px; color: var(--text-primary); margin-bottom: 4px; font-weight: 500; }
.sr-snippet { font-size: 12px; color: var(--text-muted); line-height: 1.5; }
.sr-snippet mark {
  background: rgba(37,99,235,0.12);
  color: var(--accent);
  border-radius: 2px;
  padding: 0 2px;
}
.search-empty {
  font-size: 14px;
  color: var(--text-muted);
  text-align: center;
  padding: 40px;
  font-family: var(--font-mono);
}

/* ---- SCROLL TO TOP ---- */
.scroll-top {
  position: fixed;
  bottom: 32px;
  right: 100px;
  width: 44px;
  height: 44px;
  border: 1px solid var(--border-strong);
  border-radius: 50%;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s, color 0.15s, border-color 0.15s, background 0.15s;
  background: var(--bg-card);
  box-shadow: var(--shadow-sm);
}
.scroll-top.visible { opacity: 1; pointer-events: auto; }
.scroll-top:hover { color: var(--accent); border-color: var(--accent); background: var(--accent-subtle); }

/* ---- FOOTER ---- */
.site-footer { padding: 48px 0 32px; }
.footer-divider { height: 1px; background: var(--border); margin-bottom: 32px; }
.footer-text {
  font-size: 16px;
  color: var(--text-secondary);
  margin-bottom: 8px;
}
.footer-meta {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-disabled);
  letter-spacing: 0.5px;
}

/* ---- HIGHLIGHT (search) ---- */
.highlight { background: rgba(37,99,235,0.12); border-radius: 2px; padding: 0 2px; }

/* ---- AI Q&A WIDGET ---- */
.ai-widget {
  position: fixed;
  bottom: 32px;
  right: 32px;
  z-index: 200;
  font-family: var(--font-sans);
}
.ai-toggle {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--accent);
  color: #ffffff;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.5px;
  border: none;
  cursor: pointer;
  box-shadow: 0 4px 16px rgba(37,99,235,0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.2s, box-shadow 0.2s;
}
.ai-toggle:hover { transform: scale(1.06); box-shadow: 0 6px 20px rgba(37,99,235,0.4); }
.ai-toggle.open { display: none; }

.ai-panel {
  display: none;
  position: absolute;
  bottom: 0;
  right: 0;
  width: 420px;
  max-height: 600px;
  border: 1px solid var(--border-strong);
  border-radius: 6px;
  background: var(--bg-card);
  flex-direction: column;
  box-shadow: 0 8px 32px rgba(0,0,0,0.14);
}
.ai-panel.open { display: flex; }

.ai-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
  color: var(--text-primary);
  font-size: 14px;
  font-weight: 500;
  flex-shrink: 0;
}
.ai-close, .ai-config-btn {
  font-size: 18px;
  color: var(--text-muted);
  cursor: pointer;
  background: none;
  border: none;
  min-width: 44px;
  min-height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius);
  transition: color 0.15s, background 0.15s;
}
.ai-close:hover, .ai-config-btn:hover { color: var(--text-primary); background: var(--bg-hover); }
.ai-config-btn { font-size: 20px; }
.ai-config-btn.active { color: var(--accent); }

.ai-api-key-bar {
  display: flex;
  gap: 8px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-surface);
  flex-shrink: 0;
}
.ai-key-input {
  flex: 1;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 7px 12px;
  outline: none;
  min-height: 44px;
  transition: border-color 0.15s;
}
.ai-key-input:focus { border-color: var(--accent); }
.ai-key-input::placeholder { color: var(--text-disabled); }
.ai-key-save {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 1px;
  color: var(--text-primary);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  background: var(--bg-card);
  padding: 6px 18px;
  cursor: pointer;
  white-space: nowrap;
  min-height: 44px;
  transition: background 0.15s;
}
.ai-key-save:hover { background: var(--bg-hover); }
.ai-key-save.saved {
  border-color: var(--accent);
  color: var(--accent);
}

.ai-settings {
  display: none;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-surface);
  flex-direction: column;
  gap: 12px;
}
.ai-settings.open { display: flex; }
.ai-settings-field { display: flex; flex-direction: column; gap: 6px; }
.ai-settings-label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  color: var(--text-muted);
}
.ai-settings-input {
  width: 100%;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 12px;
  padding: 9px 12px;
  outline: none;
  min-height: 44px;
  transition: border-color 0.15s;
}
.ai-settings-input:focus { border-color: var(--accent); }
.ai-settings-textarea {
  width: 100%;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 12px;
  padding: 9px 12px;
  outline: none;
  resize: vertical;
  min-height: 60px;
  line-height: 1.5;
  transition: border-color 0.15s;
}
.ai-settings-textarea:focus { border-color: var(--accent); }
.ai-settings-textarea::placeholder { color: var(--text-disabled); }
.ai-settings-save {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 1px;
  color: var(--text-primary);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  background: var(--bg-card);
  padding: 9px 22px;
  cursor: pointer;
  min-height: 44px;
  align-self: flex-end;
  transition: background 0.15s;
}
.ai-settings-save:hover { background: var(--bg-hover); }
.ai-settings-save.saved {
  border-color: var(--accent);
  color: var(--accent);
}

.ai-messages {
  flex: 1;
  overflow-y: auto;
  padding: 14px 18px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-height: 180px;
  max-height: 340px;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}
.ai-messages::-webkit-scrollbar { width: 4px; }
.ai-messages::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }

.ai-msg { display: flex; margin-bottom: 4px; }
.ai-msg-user { justify-content: flex-end; }
.ai-msg-system { justify-content: flex-start; }
.ai-msg-content {
  max-width: 90%;
  padding: 11px 16px;
  font-size: 13px;
  line-height: 1.65;
  border-radius: var(--radius);
  word-wrap: break-word;
  white-space: pre-wrap;
}
.ai-msg-user .ai-msg-content {
  background: var(--accent);
  color: #ffffff;
}
.ai-msg-system .ai-msg-content {
  background: var(--bg-surface);
  color: var(--text-primary);
  border: 1px solid var(--border);
}
.ai-msg-loading .ai-msg-content {
  color: var(--text-muted);
  font-style: italic;
  border-style: dashed;
}

.ai-input-bar {
  display: flex;
  gap: 8px;
  padding: 12px 14px;
  border-top: 1px solid var(--border);
  flex-shrink: 0;
}
.ai-input {
  flex: 1;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 13px;
  padding: 9px 14px;
  outline: none;
  min-height: 44px;
  transition: border-color 0.15s;
}
.ai-input:focus { border-color: var(--accent); }
.ai-input::placeholder { color: var(--text-disabled); }
.ai-send {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 1px;
  color: #fff;
  background: var(--accent);
  border: none;
  border-radius: var(--radius);
  padding: 9px 22px;
  cursor: pointer;
  min-height: 44px;
  min-width: 44px;
  transition: opacity 0.15s;
}
.ai-send:hover { opacity: 0.88; }
.ai-send:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ---- TOUCH TARGETS (>= 44px) ---- */
.sidenav-item { min-height: 44px; }
.sidenav-sub { min-height: 44px; padding: 11px 16px; }
.btn-ghost { min-height: 44px; display: flex; align-items: center; }

/* ---- Row highlight on hover ---- */
.matrix-table tbody tr:hover th {
  color: var(--accent);
}
.matrix-table tbody tr:hover td {
  background: var(--accent-subtle);
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 1024px) {
  .main-content { padding: 0 36px 80px; max-width: 100%; }
}

@media (max-width: 768px) {
  :root { --sidebar-w: 0px; }
  .sidebar {
    transform: translateX(-240px);
    width: 240px;
    transition: transform 0.3s ease;
    z-index: 95;
  }
  .sidebar.open { transform: translateX(0); }
  .main-content { margin-left: 0; padding: 0 20px 64px; max-width: 100%; }
  .hamburger { display: flex; }
  .topnav-right .progress-label { display: none; }
  .topnav { padding: 0 16px; gap: 12px; }
  .topnav-center { max-width: 200px; }

  .hero-title { font-size: 38px; }
  .hero-stats { flex-wrap: wrap; gap: 0; }
  .stat-item { padding: 14px 22px; }
  .stat-item:first-child { border-radius: var(--radius) 0 0 var(--radius); }
  .stat-item:last-child { border-radius: 0 var(--radius) var(--radius) 0; }

  .pg-item { grid-template-columns: 1fr; gap: 14px; padding: 22px; }
  .pg-num-label { flex-direction: row; align-items: center; gap: 12px; }
  .pg-num { font-size: 24px; }
  .pg-analogy { border-left: none; border-top: 3px solid var(--accent); padding: 14px 0 0; border-radius: 0; background: none; }

  .doc-grid { grid-template-columns: 1fr; }
  .principles-grid { grid-template-columns: 1fr; }
  .pd-grid { grid-template-columns: 1fr; }

  .ka-header { padding: 18px 20px; }
  .ka-num { font-size: 22px; }
  .ka-body { overflow: visible; }
  .itto-table th, .itto-table td { padding: 10px 14px; font-size: 12px; }
  .ka-detailed { padding: 18px 20px; }

  .search-overlay {
    left: 0;
    right: 0;
    top: var(--topnav-h);
    max-height: calc(100vh - var(--topnav-h));
    z-index: 85;
  }

  .ai-widget { bottom: 16px; right: 16px; }
  .ai-panel {
    position: fixed;
    width: calc(100vw - 32px);
    max-height: 65vh;
    bottom: 80px;
    right: 16px;
  }
  .ai-messages { max-height: 240px; }

  .section-note { padding: 10px 14px; }
}

@media (max-width: 480px) {
  .hero-section { padding: 48px 0 40px; }
  .hero-title { font-size: 32px; letter-spacing: -0.5px; }
  .hero-stats { gap: 8px; }
  .stat-item {
    flex: 1 1 40%;
    padding: 14px 16px;
    border-radius: var(--radius) !important;
    border: 1px solid var(--border) !important;
    margin-left: 0 !important;
  }
  .mnemonic-card { flex-direction: column; gap: 6px; align-items: flex-start; }
  .note-item { flex-direction: column; gap: 8px; }
  .note-term { min-width: unset; }

  /* Card-based ITTO on small screens */
  .itto-table thead { display: none; }
  .itto-table, .itto-table tbody, .itto-table tr, .itto-table td {
    display: block;
  }
  .itto-table tr {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    margin-bottom: 14px;
    padding: 0;
    background: var(--bg-card);
  }
  .itto-table td {
    padding: 11px 16px;
    border: none;
    border-bottom: 1px solid var(--border);
    min-width: unset !important;
    white-space: normal !important;
    overflow-wrap: break-word;
    word-break: break-word;
  }
  .itto-table td:last-child { border-bottom: none; }
  /* 操作列在卡片模式下只显示按钮，隐藏 label */
  .itto-table td[data-label="操作"]::before { display: none !important; }
  .itto-table td[data-label="操作"] { padding: 8px 16px !important; display: flex !important; justify-content: flex-end; }
  /* Mobile: hide the operation column button, show button next to name */
  .row-quiz-btn { display: none !important; }
  .mobile-quiz-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    margin-left: 8px;
    font-size: 15px;
    color: var(--accent);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--bg-card);
    cursor: pointer;
    vertical-align: middle;
    transition: border-color 0.15s, background 0.15s;
  }
  .mobile-quiz-btn:hover { border-color: var(--accent); background: var(--accent-subtle); }
  .mobile-quiz-btn.mastered { color: var(--green); border-color: var(--green); background: var(--green-bg); }
  .mobile-quiz-btn.mastered:hover { color: var(--red); border-color: var(--red); background: var(--red-bg); }
  /* Mobile: hide toggle icon, show expand hint at card bottom */
  .itto-toggle-cell { display: none !important; }
  .itto-row-clickable {
    position: relative;
  }
  .itto-row-clickable::after {
    content: '点击展开详情 ▼';
    display: block;
    padding: 10px 16px;
    text-align: center;
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--accent);
    border-top: 1px dashed var(--border);
    cursor: pointer;
  }
  .itto-row-clickable[data-expanded="true"]::after {
    content: '点击收起详情 ▲';
  }
  .itto-detail-row {
    margin-top: -4px;
  }
  .itto-detail-row td {
    padding: 0 !important;
    border: 1px solid var(--border) !important;
    border-top: none !important;
    border-radius: 0 0 var(--radius) var(--radius);
    margin-top: -8px;
  }
  .itto-table td::before {
    content: attr(data-label);
    display: block;
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 6px;
    font-weight: 500;
  }

  .principle-card { padding: 20px; }
  .search-result-item { padding: 16px; }
  .flow-step { font-size: 11px; padding: 7px 12px; }
  .ka-header { padding: 16px; }
  .ka-header-left { gap: 12px; }
  .ka-body { overflow: visible; }
  .ka-detailed { padding: 14px 16px; }
  .pd-card { padding: 20px; }
  .pg-item { padding: 20px; }
  .doc-card { padding: 20px; }

  .content-section { margin-bottom: 56px; }
  .section-title { font-size: 22px; }

  .ai-panel {
    width: calc(100vw - 16px);
    right: 8px;
    max-height: 70vh;
  }
  .ai-widget { bottom: 12px; right: 12px; }
  .scroll-top { right: 72px; bottom: 16px; }

  .matrix-table { font-size: 10px; }
  .matrix-table th, .matrix-table td { padding: 6px 5px; }
  .matrix-table tbody th { font-size: 10px; padding: 6px 8px; }
}