/* ──────────────────────────────────────────────────────────
 * TeachAny My History — my.html 专属样式
 * 暗色 + glassmorphism + 蓝紫渐变，跟 index.html / path.html 一致
 * ──────────────────────────────────────────────────────────*/

:root {
  --bg: #0f172a;
  --bg2: #1e293b;
  --card: rgba(30, 41, 59, 0.7);
  --card-strong: rgba(30, 41, 59, 0.92);
  --border: rgba(148, 163, 184, 0.15);
  --border-strong: rgba(148, 163, 184, 0.32);
  --text: #f8fafc;
  --dim: #94a3b8;
  --dimmer: #64748b;
  --primary: #3b82f6;
  --secondary: #8b5cf6;
  --accent: #f59e0b;
  --success: #10b981;
  --danger: #ef4444;
  --warning: #eab308;
  --cyan: #06b6d4;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Inter', 'PingFang SC', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  min-height: 100vh;
}

/* Top Bar (与 index.html 完全一致) */
.top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 24px;
  background: #1e293b;
  border-bottom: 1px solid rgba(148,163,184,0.15);
}
.top-bar h1 {
  font-size: 20px;
  font-weight: 700;
  background: linear-gradient(135deg, #3b82f6, #8b5cf6);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.nav-links { display: flex; gap: 8px; align-items: center; }
.nav-links a {
  color: #94a3b8;
  text-decoration: none;
  padding: 6px 14px;
  border-radius: 6px;
  font-size: 14px;
  transition: all 0.2s;
}
.nav-links a:hover, .nav-links a.active {
  color: #f8fafc;
  background: rgba(59,130,246,0.15);
}
.backup-btn {
  margin-left: 12px;
  padding: 6px 14px;
  border-radius: 8px;
  background: linear-gradient(135deg, rgba(59,130,246,0.18), rgba(139,92,246,0.18));
  color: var(--text);
  font-size: 13px;
  font-weight: 600;
  border: 1px solid rgba(59,130,246,0.4);
  cursor: pointer;
  transition: all 0.25s;
}
.backup-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 18px rgba(59,130,246,0.25);
  background: linear-gradient(135deg, rgba(59,130,246,0.3), rgba(139,92,246,0.3));
}

/* Hero */
.my-hero {
  padding: 56px 24px 32px;
  background: linear-gradient(135deg, rgba(59,130,246,0.08), rgba(139,92,246,0.06), rgba(245,158,11,0.04));
  border-bottom: 1px solid var(--border);
}
.my-hero-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}
@media (min-width: 900px) {
  .my-hero-inner { grid-template-columns: 1.2fr 1.8fr; align-items: center; }
}
.my-hero h1 {
  font-size: 38px;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary), var(--secondary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 8px;
  line-height: 1.2;
}
.my-hero .subtitle {
  font-size: 16px;
  color: var(--dim);
  max-width: 520px;
}
.my-hero .privacy-tip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 14px;
  padding: 6px 12px;
  border-radius: 999px;
  background: rgba(16,185,129,0.12);
  color: var(--success);
  font-size: 12px;
  font-weight: 600;
}

/* Stat chips */
.stat-chips {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 12px;
}
.stat-chip {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 14px 16px;
  backdrop-filter: blur(10px);
  transition: all 0.25s;
}
.stat-chip:hover {
  transform: translateY(-2px);
  border-color: rgba(59,130,246,0.4);
}
.stat-chip .num {
  font-size: 24px;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.stat-chip .lbl {
  font-size: 12px;
  color: var(--dim);
  margin-top: 2px;
}
.stat-chip[data-color="green"] .num { background: linear-gradient(135deg, #10b981, #06b6d4); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.stat-chip[data-color="amber"] .num { background: linear-gradient(135deg, #f59e0b, #ef4444); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.stat-chip[data-color="violet"] .num { background: linear-gradient(135deg, #8b5cf6, #ec4899); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 36px 24px 80px;
}

/* Tabs */
.tab-bar {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
  border-bottom: 1px solid var(--border);
  margin-bottom: 28px;
  position: sticky;
  top: 0;
  background: rgba(15,23,42,0.85);
  backdrop-filter: blur(12px);
  z-index: 10;
  padding-top: 4px;
}
.tab {
  position: relative;
  padding: 12px 18px;
  font-size: 14px;
  font-weight: 600;
  color: var(--dim);
  cursor: pointer;
  border: none;
  background: transparent;
  transition: color 0.2s;
  display: flex;
  align-items: center;
  gap: 6px;
}
.tab .badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 22px;
  height: 22px;
  padding: 0 7px;
  border-radius: 11px;
  background: rgba(148,163,184,0.18);
  color: var(--dim);
  font-size: 11px;
  font-weight: 700;
}
.tab:hover { color: var(--text); }
.tab.active { color: var(--text); }
.tab.active .badge {
  background: rgba(59,130,246,0.25);
  color: var(--primary);
}
.tab.active::after {
  content: '';
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: -1px;
  height: 3px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-radius: 3px;
}

/* Tab Panels */
.tab-panel { display: none; animation: fadeIn 0.3s ease; }
.tab-panel.active { display: block; }
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Card Grid */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 20px;
}
.history-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 18px;
  backdrop-filter: blur(10px);
  transition: all 0.25s;
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 10px;
  cursor: pointer;
  text-decoration: none;
  color: inherit;
}
.history-card:hover {
  transform: translateY(-4px);
  border-color: rgba(59,130,246,0.45);
  box-shadow: 0 14px 38px rgba(0,0,0,0.4);
}
.history-card .source-tag {
  position: absolute;
  top: 14px;
  right: 14px;
  font-size: 10px;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 999px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.history-card .source-tag.skill { background: rgba(139,92,246,0.18); color: var(--secondary); }
.history-card .source-tag.pbl { background: rgba(239,68,68,0.18); color: var(--danger); }
.history-card .source-tag.import { background: rgba(59,130,246,0.18); color: var(--primary); }
.history-card .source-tag.unknown { background: rgba(148,163,184,0.18); color: var(--dim); }

.history-card h3 {
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
  padding-right: 76px;
  line-height: 1.4;
}
.history-card .meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  font-size: 12px;
  color: var(--dim);
}
.history-card .meta-row .pill {
  padding: 2px 8px;
  border-radius: 999px;
  background: rgba(148,163,184,0.1);
}
.history-card .meta-row .pill.success { background: rgba(16,185,129,0.16); color: var(--success); }
.history-card .meta-row .pill.warning { background: rgba(234,179,8,0.16); color: var(--warning); }
.history-card .meta-row .pill.danger { background: rgba(239,68,68,0.16); color: var(--danger); }
.history-card .meta-row .pill.info { background: rgba(59,130,246,0.16); color: var(--primary); }

.history-card .footer-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 11px;
  color: var(--dimmer);
  margin-top: auto;
  padding-top: 8px;
  border-top: 1px dashed var(--border);
}

/* Progress ring */
.progress-ring {
  width: 56px;
  height: 56px;
  flex-shrink: 0;
}
.progress-ring circle {
  fill: none;
  stroke-width: 5;
  stroke-linecap: round;
  transform: rotate(-90deg);
  transform-origin: 50% 50%;
}
.progress-ring .bg { stroke: rgba(148,163,184,0.15); }
.progress-ring .val { stroke: url(#ringGradient); transition: stroke-dashoffset 0.6s ease; }
.progress-ring text {
  font-size: 14px;
  font-weight: 700;
  fill: var(--text);
  text-anchor: middle;
  dominant-baseline: central;
}

.card-row {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* PBL card thumbnail */
.pbl-thumb {
  width: 100%;
  height: 130px;
  background: rgba(15,23,42,0.6);
  border-radius: 10px;
  border: 1px solid var(--border);
  margin-top: 6px;
  position: relative;
  overflow: hidden;
}
.pbl-thumb svg { width: 100%; height: 100%; }
.pbl-thumb .empty {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  color: var(--dimmer);
}

/* Tutor chat preview */
.chat-preview {
  background: rgba(15,23,42,0.6);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 12px;
  font-size: 12px;
  color: var(--dim);
  line-height: 1.5;
  max-height: 80px;
  overflow: hidden;
  position: relative;
}
.chat-preview::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 24px;
  background: linear-gradient(to bottom, transparent, rgba(30,41,59,0.7));
  pointer-events: none;
}

/* Empty state */
.empty-state {
  text-align: center;
  padding: 80px 24px;
  background: var(--card);
  border: 1px dashed var(--border-strong);
  border-radius: 22px;
}
.empty-state .icon {
  font-size: 64px;
  margin-bottom: 18px;
  opacity: 0.6;
}
.empty-state h2 {
  font-size: 20px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 8px;
}
.empty-state p {
  font-size: 14px;
  color: var(--dim);
  max-width: 460px;
  margin: 0 auto 20px;
}
.empty-state .cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 20px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: white;
  font-weight: 600;
  font-size: 14px;
  text-decoration: none;
  transition: all 0.2s;
}
.empty-state .cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(59,130,246,0.3);
}

/* Drawer */
.drawer-mask {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.55);
  backdrop-filter: blur(4px);
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s;
  z-index: 50;
}
.drawer-mask.open {
  opacity: 1;
  visibility: visible;
}
.drawer {
  position: fixed;
  top: 0; right: 0;
  bottom: 0;
  width: 100%;
  max-width: 420px;
  background: var(--bg2);
  border-left: 1px solid var(--border);
  box-shadow: -10px 0 40px rgba(0,0,0,0.45);
  transform: translateX(100%);
  transition: transform 0.32s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 51;
  overflow-y: auto;
}
.drawer.open { transform: translateX(0); }
.drawer-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 24px;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: var(--bg2);
  z-index: 1;
}
.drawer-header h2 { font-size: 18px; font-weight: 700; }
.drawer-close {
  border: none;
  background: rgba(148,163,184,0.15);
  color: var(--text);
  width: 32px;
  height: 32px;
  border-radius: 8px;
  font-size: 18px;
  cursor: pointer;
  transition: background 0.2s;
}
.drawer-close:hover { background: rgba(239,68,68,0.25); }
.drawer-body { padding: 18px 24px 32px; }
.drawer-body section {
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px;
  margin-bottom: 16px;
  background: rgba(15,23,42,0.5);
}
.drawer-body section h3 {
  font-size: 14px;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--text);
}
.drawer-body section p {
  font-size: 12px;
  color: var(--dim);
  margin-bottom: 12px;
  line-height: 1.6;
}
.drawer-body section .actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.drawer-body button.btn {
  flex: 1 1 auto;
  padding: 9px 14px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 600;
  border: 1px solid var(--border);
  background: rgba(148,163,184,0.08);
  color: var(--text);
  cursor: pointer;
  transition: all 0.2s;
}
.drawer-body button.btn:hover {
  border-color: var(--primary);
  background: rgba(59,130,246,0.15);
}
.drawer-body button.btn.primary {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-color: transparent;
}
.drawer-body button.btn.primary:hover { box-shadow: 0 6px 20px rgba(59,130,246,0.32); }
.drawer-body button.btn.danger {
  background: rgba(239,68,68,0.15);
  border-color: rgba(239,68,68,0.4);
  color: var(--danger);
}
.drawer-body button.btn.danger:hover {
  background: rgba(239,68,68,0.28);
}
.drawer-body .file-drop {
  border: 1px dashed var(--border-strong);
  border-radius: 10px;
  padding: 18px;
  text-align: center;
  font-size: 12px;
  color: var(--dim);
  cursor: pointer;
  transition: all 0.2s;
}
.drawer-body .file-drop:hover, .drawer-body .file-drop.over {
  border-color: var(--primary);
  background: rgba(59,130,246,0.08);
  color: var(--text);
}
.drawer-body .file-drop input { display: none; }

.bucket-clear-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}
.bucket-clear-list button {
  padding: 8px 10px;
  border-radius: 8px;
  font-size: 12px;
  border: 1px solid var(--border);
  background: rgba(148,163,184,0.08);
  color: var(--dim);
  cursor: pointer;
  text-align: left;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.bucket-clear-list button:hover {
  border-color: rgba(239,68,68,0.4);
  color: var(--danger);
}

.toast {
  position: fixed;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 20px;
  font-size: 13px;
  color: var(--text);
  box-shadow: 0 12px 32px rgba(0,0,0,0.4);
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s;
  z-index: 100;
}
.toast.show {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}
.toast.success { border-color: rgba(16,185,129,0.5); }
.toast.error { border-color: rgba(239,68,68,0.5); }

/* Scrollbar */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: rgba(15,23,42,0.5); }
::-webkit-scrollbar-thumb {
  background: rgba(148,163,184,0.25);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover { background: rgba(148,163,184,0.4); }