/* =============================================
   WorldQuant BRAIN 培训系统 — 共享样式
   ============================================= */

:root {
  --bg: #0d1117;
  --bg2: #0a0f1a;
  --card: #161b22;
  --card2: #1c2333;
  --border: #30363d;
  --accent: #00d4aa;
  --accent2: #58a6ff;
  --accent3: #f78166;
  --text: #e6edf3;
  --text2: #c9d1d9;
  --muted: #8b949e;
  --tag-bg: #21262d;
  --sidebar-w: 240px;
  --topbar-h: 56px;
  --success: #3fb950;
  --warning: #d29922;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
               "Microsoft YaHei", "Helvetica Neue", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.8;
  font-size: 15px;
}

/* ── Topbar ── */
.topbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  height: var(--topbar-h);
  background: rgba(13,17,23,0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center; padding: 0 24px;
  gap: 16px;
}
.topbar-logo {
  font-weight: 700; font-size: 15px; color: var(--accent);
  text-decoration: none; white-space: nowrap;
  display: flex; align-items: center; gap: 8px;
}
.topbar-logo span { color: var(--text); }
.topbar-nav {
  display: flex; gap: 4px; align-items: center; flex: 1;
  overflow-x: auto; padding-bottom: 2px;
}
.topbar-nav a {
  padding: 5px 12px; border-radius: 6px;
  text-decoration: none; font-size: 13px; color: var(--muted);
  white-space: nowrap; transition: all 0.15s;
}
.topbar-nav a:hover { color: var(--text); background: var(--tag-bg); }
.topbar-nav a.active { color: var(--accent); background: rgba(0,212,170,0.1); }
.topbar-right { margin-left: auto; display: flex; gap: 8px; align-items: center; }
.topbar-badge {
  font-size: 11px; padding: 2px 8px; border-radius: 10px;
  background: rgba(0,212,170,0.15); color: var(--accent);
  border: 1px solid rgba(0,212,170,0.3); white-space: nowrap;
}

/* ── Page Layout ── */
.page-wrap {
  display: flex;
  padding-top: var(--topbar-h);
  min-height: 100vh;
}

/* ── Sidebar ── */
.sidebar {
  width: var(--sidebar-w);
  flex-shrink: 0;
  position: sticky;
  top: var(--topbar-h);
  height: calc(100vh - var(--topbar-h));
  overflow-y: auto;
  border-right: 1px solid var(--border);
  background: var(--bg);
  padding: 24px 0;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}
.sidebar::-webkit-scrollbar { width: 4px; }
.sidebar::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }

.sidebar-section { margin-bottom: 20px; }
.sidebar-label {
  font-size: 10px; color: var(--muted); letter-spacing: 2px;
  text-transform: uppercase; padding: 0 20px; margin-bottom: 6px;
  display: block;
}
.sidebar-item {
  display: flex; align-items: center; gap: 8px;
  padding: 7px 20px; font-size: 13px; color: var(--muted);
  text-decoration: none; transition: all 0.15s;
  border-left: 2px solid transparent;
}
.sidebar-item:hover { color: var(--text); background: rgba(255,255,255,0.03); }
.sidebar-item.active {
  color: var(--accent); border-left-color: var(--accent);
  background: rgba(0,212,170,0.06);
}
.sidebar-item .si-num {
  font-size: 11px; font-weight: 700; color: var(--accent);
  opacity: 0.6; min-width: 20px;
}
.sidebar-divider {
  height: 1px; background: var(--border); margin: 12px 20px;
}

/* ── Main Content ── */
.main {
  flex: 1; min-width: 0;
  padding: 40px 48px 80px;
  max-width: 900px;
}

/* ── Hero Banner ── */
.hero {
  background: linear-gradient(135deg, #0a1628 0%, #1a2744 50%, #0d2137 100%);
  padding: 56px 48px;
  text-align: center;
  border-bottom: 1px solid var(--border);
  position: relative; overflow: hidden;
}
.hero::before {
  content: ''; position: absolute; inset: 0;
  background: radial-gradient(ellipse at 50% -20%, rgba(0,212,170,0.15) 0%, transparent 65%);
  pointer-events: none;
}
.hero-tag {
  display: inline-block; font-size: 11px; color: var(--accent);
  letter-spacing: 3px; text-transform: uppercase;
  background: rgba(0,212,170,0.1); border: 1px solid rgba(0,212,170,0.25);
  padding: 4px 14px; border-radius: 20px; margin-bottom: 20px;
}
.hero h1 {
  font-size: 38px; font-weight: 800; margin-bottom: 14px;
  background: linear-gradient(135deg, #fff 30%, var(--accent) 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  line-height: 1.2;
}
.hero p { color: var(--muted); font-size: 16px; max-width: 560px; margin: 0 auto 28px; }
.hero-stats {
  display: flex; justify-content: center; gap: 20px; flex-wrap: wrap;
}
.hero-stat {
  background: rgba(255,255,255,0.05); border: 1px solid var(--border);
  border-radius: 12px; padding: 12px 22px; text-align: center;
}
.hero-stat .v { font-size: 22px; font-weight: 700; color: var(--accent); }
.hero-stat .l { font-size: 12px; color: var(--muted); margin-top: 2px; }

/* ── Section headings ── */
.page-section { margin-bottom: 56px; }
.section-head {
  display: flex; align-items: center; gap: 14px;
  margin-bottom: 20px; padding-bottom: 14px;
  border-bottom: 1px solid var(--border);
}
.section-badge {
  width: 36px; height: 36px; border-radius: 9px; flex-shrink: 0;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 14px; color: #000;
}
.section-head h2 { font-size: 20px; font-weight: 700; }
.section-head .sec-url {
  font-size: 11px; color: var(--muted); font-family: monospace;
  background: var(--tag-bg); padding: 2px 8px; border-radius: 4px; margin-left: 8px;
}

h3 { font-size: 16px; color: var(--accent2); margin: 24px 0 10px; font-weight: 600; }
h4 { font-size: 14px; color: var(--text2); margin: 16px 0 8px; font-weight: 600; }

p { color: var(--text2); margin-bottom: 12px; }
ul, ol { padding-left: 22px; color: var(--text2); font-size: 14px; margin-bottom: 12px; }
li { margin-bottom: 5px; }
strong { color: var(--text); }
code {
  font-family: "SF Mono", "Fira Code", "Cascadia Code", monospace;
  font-size: 13px; background: var(--tag-bg); color: var(--accent);
  padding: 1px 6px; border-radius: 4px; border: 1px solid var(--border);
}

/* ── Code Block ── */
.code-block {
  background: #0d1117; border: 1px solid var(--border);
  border-radius: 10px; overflow: hidden; margin: 16px 0;
}
.code-block-header {
  background: var(--tag-bg); padding: 8px 16px;
  font-size: 12px; color: var(--muted); display: flex; align-items: center; gap: 8px;
  border-bottom: 1px solid var(--border);
}
.code-block pre {
  padding: 16px 20px; overflow-x: auto; font-size: 13px;
  font-family: "SF Mono", "Fira Code", monospace;
  color: #e6edf3; line-height: 1.6;
}
.code-block pre .kw { color: #ff7b72; }
.code-block pre .fn { color: #d2a8ff; }
.code-block pre .str { color: #a5d6ff; }
.code-block pre .cm { color: #8b949e; font-style: italic; }
.code-block pre .num { color: #79c0ff; }

/* ── Cards ── */
.card-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 14px; margin: 16px 0;
}
.card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: 10px; padding: 16px;
  transition: border-color 0.15s;
}
.card:hover { border-color: rgba(0,212,170,0.4); }
.card-icon { font-size: 22px; margin-bottom: 8px; }
.card-title { font-size: 13px; font-weight: 600; color: var(--text); margin-bottom: 5px; }
.card-body { font-size: 12px; color: var(--muted); line-height: 1.5; }

/* ── Table ── */
.table-wrap { overflow-x: auto; margin: 16px 0; }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th {
  background: var(--tag-bg); color: var(--accent);
  font-weight: 600; text-align: left; padding: 10px 14px;
  border: 1px solid var(--border); font-size: 11px;
  letter-spacing: 1px; text-transform: uppercase;
}
td { padding: 10px 14px; border: 1px solid var(--border); color: var(--text2); vertical-align: top; }
tr:nth-child(even) td { background: rgba(255,255,255,0.02); }

/* ── Callout ── */
.callout {
  border-radius: 8px; padding: 14px 18px; margin: 16px 0;
  font-size: 14px; color: var(--text2);
  display: flex; gap: 12px; align-items: flex-start;
}
.callout-icon { font-size: 18px; flex-shrink: 0; margin-top: 1px; }
.callout.info {
  background: rgba(88,166,255,0.08); border: 1px solid rgba(88,166,255,0.25);
  border-left: 3px solid var(--accent2);
}
.callout.tip {
  background: rgba(0,212,170,0.07); border: 1px solid rgba(0,212,170,0.25);
  border-left: 3px solid var(--accent);
}
.callout.warn {
  background: rgba(210,153,34,0.08); border: 1px solid rgba(210,153,34,0.25);
  border-left: 3px solid var(--warning);
}
.callout.important {
  background: rgba(247,129,102,0.08); border: 1px solid rgba(247,129,102,0.25);
  border-left: 3px solid var(--accent3);
}
.callout strong { color: inherit; }

/* ── Tags ── */
.tag {
  display: inline-block; padding: 2px 8px; border-radius: 4px;
  font-size: 11px; font-weight: 600; letter-spacing: 0.5px;
}
.tag.green  { background: rgba(63,185,80,0.12);  color: #3fb950; border: 1px solid rgba(63,185,80,0.3); }
.tag.blue   { background: rgba(88,166,255,0.12); color: #58a6ff; border: 1px solid rgba(88,166,255,0.3); }
.tag.orange { background: rgba(255,140,0,0.12);  color: #ff8c00; border: 1px solid rgba(255,140,0,0.3); }
.tag.red    { background: rgba(247,129,102,0.12);color: #f78166; border: 1px solid rgba(247,129,102,0.3); }
.tag.gray   { background: rgba(139,148,158,0.12);color: #8b949e; border: 1px solid rgba(139,148,158,0.3); }
.tag.teal   { background: rgba(0,212,170,0.12);  color: #00d4aa; border: 1px solid rgba(0,212,170,0.3); }

/* ── Steps ── */
.steps { margin: 16px 0; }
.step {
  display: flex; gap: 16px; margin-bottom: 20px;
  padding-bottom: 20px; border-bottom: 1px solid var(--border);
}
.step:last-child { border-bottom: none; margin-bottom: 0; }
.step-num {
  width: 32px; height: 32px; border-radius: 50%; flex-shrink: 0;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 13px; color: #000; margin-top: 2px;
}
.step-content h4 { margin-top: 0; color: var(--text); }

/* ── Progress bar ── */
.progress-bar {
  background: var(--border); border-radius: 4px; height: 6px;
  overflow: hidden; margin: 6px 0;
}
.progress-bar-fill {
  height: 100%; border-radius: 4px;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
}

/* ── Screenshot (reused from tour) ── */
.screenshot-wrap {
  background: var(--card); border: 1px solid var(--border);
  border-radius: 12px; overflow: hidden; margin: 20px 0;
  box-shadow: 0 8px 32px rgba(0,0,0,0.4);
}
.screenshot-bar {
  background: #21262d; padding: 9px 14px;
  display: flex; align-items: center; gap: 7px;
  border-bottom: 1px solid var(--border);
}
.dot { width: 11px; height: 11px; border-radius: 50%; }
.dot.r { background: #ff5f56; }
.dot.y { background: #ffbd2e; }
.dot.g { background: #27c93f; }
.screenshot-url {
  flex: 1; background: var(--bg); border-radius: 5px;
  padding: 3px 10px; font-size: 12px; color: var(--muted); font-family: monospace;
}
.screenshot img { width: 100%; display: block; }

/* ── Footer ── */
footer {
  text-align: center; padding: 28px; color: var(--muted); font-size: 12px;
  border-top: 1px solid var(--border);
}
footer a { color: var(--muted); }

/* ── Responsive ── */
@media (max-width: 768px) {
  .sidebar { display: none; }
  .main { padding: 24px 20px 60px; }
  .topbar-nav { display: none; }
  .hero { padding: 40px 20px; }
  .hero h1 { font-size: 26px; }
  .search-input { width: 120px; }
  .search-input:focus { width: 150px; }
}

/* =============================================
   功能扩展样式：搜索 · 进度 · 测验
   ============================================= */

/* ── 搜索框 ── */
.search-wrap {
  display: none !important;
}
.search-input {
  padding: 5px 12px 5px 28px;
  border-radius: 20px;
  border: 1px solid var(--border);
  background: var(--tag-bg);
  color: var(--text2);
  font-size: 13px;
  width: 180px;
  outline: none;
  transition: border-color 0.15s, width 0.2s;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 24 24' fill='none' stroke='%238b949e' stroke-width='2'%3E%3Ccircle cx='11' cy='11' r='8'/%3E%3Cpath d='m21 21-4.35-4.35'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: 8px center;
}
.search-input:focus {
  border-color: var(--accent);
  width: 240px;
}
.search-input::placeholder { color: var(--muted); }
.search-dropdown {
  display: none;
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  width: 320px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.4);
  z-index: 200;
  overflow: hidden;
}
.search-result {
  display: block;
  padding: 10px 14px;
  text-decoration: none;
  border-bottom: 1px solid var(--border);
  transition: background 0.1s;
}
.search-result:last-child { border-bottom: none; }
.search-result:hover { background: var(--card2); }
.search-result-label {
  font-size: 10px;
  color: var(--accent);
  font-weight: 600;
  margin-bottom: 2px;
}
.search-result-title {
  font-size: 13px;
  color: var(--text2);
  display: block;
}
.search-result-title mark {
  background: rgba(0,212,170,0.2);
  color: var(--accent);
  border-radius: 2px;
  padding: 0 2px;
}
.search-no-result {
  padding: 12px 14px;
  font-size: 13px;
  color: var(--muted);
  text-align: center;
}

/* ── 进度追踪 ── */
.prog-check {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 14px;
  height: 14px;
  border-radius: 3px;
  border: 1px solid var(--border);
  flex-shrink: 0;
  margin-right: 6px;
  font-size: 9px;
  cursor: pointer;
  transition: all 0.15s;
  vertical-align: middle;
}
.prog-check:hover { border-color: var(--accent); }
.prog-check.checked {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--bg);
}
.prog-check.checked::after { content: "✓"; }

.topbar-progress {
  display: flex;
  align-items: center;
  gap: 5px;
  cursor: default;
  flex-shrink: 0;
}
.prog-ring-svg {
  transform: rotate(-90deg);
  flex-shrink: 0;
}
.prog-ring-track {
  fill: none;
  stroke: var(--border);
  stroke-width: 2.5;
}
.prog-ring-fill {
  fill: none;
  stroke: var(--accent);
  stroke-width: 2.5;
  stroke-linecap: round;
  stroke-dasharray: 62.83;
  stroke-dashoffset: 62.83;
  transition: stroke-dashoffset 0.5s ease;
}
.prog-ring-pct {
  font-size: 11px;
  color: var(--accent);
  font-weight: 600;
  min-width: 30px;
}

.phase-prog-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 6px;
}
.phase-prog-bar {
  flex: 1;
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  overflow: hidden;
}
.phase-prog-fill {
  height: 100%;
  background: var(--accent);
  border-radius: 2px;
  transition: width 0.5s ease;
  width: 0%;
}
.phase-prog-text {
  font-size: 11px;
  color: var(--muted);
  white-space: nowrap;
}

/* ── 测验弹窗 ── */
.quiz-launch-btn {
  width: 100%;
  padding: 8px 12px;
  background: rgba(88,166,255,0.08);
  border: 1px solid rgba(88,166,255,0.25);
  border-radius: 8px;
  color: var(--accent2);
  font-size: 13px;
  cursor: pointer;
  transition: all 0.15s;
  text-align: center;
}
.quiz-launch-btn:hover {
  background: rgba(88,166,255,0.15);
  border-color: var(--accent2);
}
.quiz-last-score {
  margin-top: 6px;
  font-size: 11px;
  color: var(--muted);
  text-align: center;
}
.quiz-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.7);
  z-index: 300;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.quiz-modal {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 24px;
  width: 100%;
  max-width: 520px;
  box-shadow: 0 16px 48px rgba(0,0,0,0.5);
}
.quiz-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}
.quiz-title { font-size: 15px; font-weight: 700; color: var(--text); }
.quiz-counter { font-size: 12px; color: var(--muted); }
.quiz-prog-bar {
  height: 3px;
  background: var(--border);
  border-radius: 2px;
  margin-bottom: 20px;
  overflow: hidden;
}
.quiz-prog-fill {
  height: 100%;
  background: var(--accent2);
  border-radius: 2px;
  transition: width 0.3s ease;
}
.quiz-question {
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 16px;
  line-height: 1.6;
}
.quiz-options { display: flex; flex-direction: column; gap: 8px; margin-bottom: 16px; }
.quiz-opt {
  padding: 10px 14px;
  background: var(--card2);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text2);
  font-size: 13px;
  text-align: left;
  cursor: pointer;
  transition: all 0.15s;
}
.quiz-opt:hover:not(:disabled) { border-color: var(--accent2); color: var(--text); }
.quiz-opt.correct { border-color: var(--success); background: rgba(63,185,80,0.08); color: var(--success); }
.quiz-opt.wrong   { border-color: var(--accent3); background: rgba(247,129,102,0.08); color: var(--accent3); }
.quiz-opt:disabled { cursor: default; }
.quiz-explain {
  font-size: 13px;
  padding: 10px 14px;
  border-radius: 8px;
  margin-bottom: 16px;
  line-height: 1.6;
  display: none;
}
.quiz-explain.correct { background: rgba(63,185,80,0.08); color: var(--success); border: 1px solid rgba(63,185,80,0.2); }
.quiz-explain.wrong   { background: rgba(247,129,102,0.08); color: var(--accent3); border: 1px solid rgba(247,129,102,0.2); }
.quiz-footer {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
}
.quiz-next-btn, .quiz-retry-btn {
  padding: 8px 18px;
  background: var(--accent2);
  border: none;
  border-radius: 8px;
  color: var(--bg);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.15s;
}
.quiz-next-btn:hover, .quiz-retry-btn:hover { opacity: 0.85; }
.quiz-close-btn {
  padding: 8px 14px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--muted);
  font-size: 13px;
  cursor: pointer;
  transition: all 0.15s;
}
.quiz-close-btn:hover { border-color: var(--text2); color: var(--text2); }
.quiz-score-card {
  text-align: center;
  padding: 24px 0;
}
.quiz-score-big {
  font-size: 48px;
  font-weight: 700;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 8px;
}
.quiz-score-big span { font-size: 24px; color: var(--muted); }
.quiz-score-label { font-size: 14px; color: var(--text2); }

/* ── User Menu Dropdown ── */
.user-menu {
  position: relative;
}
.user-menu-btn {
  display: flex; align-items: center; gap: 7px;
  padding: 5px 10px 5px 6px;
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border);
  border-radius: 20px;
  cursor: pointer;
  transition: all 0.15s;
  font-size: 13px;
  color: var(--text);
}
.user-menu-btn:hover { background: rgba(255,255,255,0.09); border-color: var(--accent); }
.user-avatar {
  width: 24px; height: 24px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent) 0%, #0077ff 100%);
  display: flex; align-items: center; justify-content: center;
  font-size: 12px; font-weight: 700; color: #000;
  flex-shrink: 0;
}
.user-name { max-width: 100px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.user-chevron { font-size: 10px; color: var(--muted); transition: transform 0.2s; }
.user-menu.open .user-chevron { transform: rotate(180deg); }
.user-dropdown {
  display: none;
  position: absolute; top: calc(100% + 8px); right: 0;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  min-width: 160px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.4);
  z-index: 1000;
  overflow: hidden;
}
.user-menu.open .user-dropdown { display: block; }
.user-dropdown-header {
  padding: 12px 14px 10px;
  border-bottom: 1px solid var(--border);
}
.user-dropdown-name { font-size: 13px; font-weight: 600; color: var(--text); }
.user-dropdown-role { font-size: 11px; color: var(--muted); margin-top: 2px; }
.user-dropdown-item {
  display: flex; align-items: center; gap: 8px;
  padding: 10px 14px;
  font-size: 13px; color: var(--muted);
  cursor: pointer;
  transition: all 0.12s;
  border: none; background: none; width: 100%; text-align: left;
}
.user-dropdown-item:hover { background: rgba(255,255,255,0.05); color: var(--text); }
.user-dropdown-item.danger:hover { color: #f85149; background: rgba(248,81,73,0.08); }