/* ═════════════════════════════════════════════════════════
   PYQ LMS Dashboard — index.css
   Premium dark/light design, Inter font, glassmorphism
   ═════════════════════════════════════════════════════════ */

/* ── Tokens ── */
:root {
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --bg: #f4f1ec;
  --bg-strong: #eef1ed;
  --surface: #fffdf9;
  --surface-alt: #f7f3ec;
  --surface-glass: rgba(255,253,249,0.78);
  --ink: #1a2537;
  --ink-secondary: #5a6a7e;
  --muted: #8896a7;
  --line: rgba(140,155,170,0.22);
  --accent: #1a7a6c;
  --accent-hover: #15614f;
  --accent-soft: rgba(26,122,108,0.12);
  --accent-glow: rgba(26,122,108,0.25);
  --blue: #3b82f6;
  --blue-soft: rgba(59,130,246,0.12);
  --green: #10b981;
  --green-soft: rgba(16,185,129,0.12);
  --amber: #f59e0b;
  --amber-soft: rgba(245,158,11,0.12);
  --purple: #8b5cf6;
  --purple-soft: rgba(139,92,246,0.12);
  --wrong: #ef4444;
  --wrong-soft: rgba(239,68,68,0.1);
  --nav-active: #1a7a6c;
  --nav-pill: rgba(26,122,108,0.1);
  --radius: 16px;
  --radius-sm: 10px;
  --radius-xs: 7px;
  --shadow: 0 4px 24px rgba(60,50,40,0.06);
  --shadow-lg: 0 12px 40px rgba(60,50,40,0.1);
  --transition: 150ms cubic-bezier(0.4,0,0.2,1);
  --sidebar-w: 260px;
}

body[data-theme="dark"] {
  --bg: #0a0f1a;
  --bg-strong: #111827;
  --surface: #141c2b;
  --surface-alt: #1a2435;
  --surface-glass: rgba(20,28,43,0.85);
  --ink: #f0f4fb;
  --ink-secondary: #94a3b8;
  --muted: #64748b;
  --line: rgba(100,130,180,0.15);
  --accent: #2dd4a8;
  --accent-hover: #22b893;
  --accent-soft: rgba(45,212,168,0.1);
  --accent-glow: rgba(45,212,168,0.2);
  --blue-soft: rgba(59,130,246,0.15);
  --green-soft: rgba(16,185,129,0.15);
  --amber-soft: rgba(245,158,11,0.15);
  --purple-soft: rgba(139,92,246,0.15);
  --wrong-soft: rgba(239,68,68,0.12);
  --nav-active: #2dd4a8;
  --nav-pill: rgba(45,212,168,0.1);
  --shadow: 0 4px 24px rgba(0,0,0,0.25);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.35);
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; }

body {
  font-family: var(--font);
  font-size: 14px;
  color: var(--ink);
  background: var(--bg);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

button, input, select, textarea { font: inherit; color: var(--ink); }
.hidden { display: none !important; }

/* ── Buttons ── */
.btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 8px 14px; border: 1px solid var(--line);
  border-radius: var(--radius-sm); background: var(--surface);
  cursor: pointer; font-weight: 500; font-size: 13px;
  transition: all var(--transition); white-space: nowrap;
}
.btn:hover { background: var(--surface-alt); }
.btn:active { transform: scale(0.97); }
.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-hover));
  color: #fff; border-color: transparent;
  box-shadow: 0 2px 12px var(--accent-glow);
}
.btn-primary:hover { filter: brightness(1.1); background: linear-gradient(135deg, var(--accent), var(--accent-hover)); }
.btn-ghost { background: transparent; border-color: transparent; }
.btn-ghost:hover { background: var(--surface-alt); }
.btn-icon { padding: 8px; border-radius: 999px; }
.btn-lg { padding: 12px 20px; font-size: 14px; font-weight: 600; }
.btn:disabled { opacity: 0.45; cursor: not-allowed; }

/* ── App Shell ── */
.app-shell {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  min-height: 100vh;
}

/* ── Sidebar ── */
.sidebar {
  position: sticky; top: 0; height: 100vh;
  display: flex; flex-direction: column;
  padding: 20px 14px;
  background: var(--surface-glass);
  backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
  border-right: 1px solid var(--line);
  overflow-y: auto; z-index: 20;
  scrollbar-width: thin; scrollbar-color: var(--line) transparent;
}
.sidebar-brand {
  display: flex; align-items: center; gap: 12px;
  padding: 4px 8px 20px; border-bottom: 1px solid var(--line);
  margin-bottom: 16px;
}
.brand-icon {
  display: flex; align-items: center; justify-content: center;
  width: 40px; height: 40px; border-radius: 12px;
  background: var(--accent-soft); color: var(--accent);
  flex-shrink: 0;
}
.sidebar-brand h1 { font-size: 16px; font-weight: 800; line-height: 1.2; }
.sidebar-brand .meta-text { font-size: 11px; margin: 0; }

.sidebar-nav {
  display: flex; flex-direction: column; gap: 4px;
  flex: 1;
}
.nav-item {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 14px; border: none; border-radius: var(--radius-sm);
  background: transparent; cursor: pointer; color: var(--ink-secondary);
  font-weight: 500; font-size: 13px; text-align: left;
  transition: all var(--transition); position: relative;
}
.nav-item:hover { background: var(--surface-alt); color: var(--ink); }
.nav-item.active {
  background: var(--nav-pill); color: var(--nav-active); font-weight: 600;
}
.nav-item.active::before {
  content: ""; position: absolute; left: 0; top: 8px; bottom: 8px;
  width: 3px; border-radius: 999px; background: var(--nav-active);
}
.nav-item--ghost { color: var(--muted); }

.sidebar-bottom {
  display: flex; flex-direction: column; gap: 8px;
  margin-top: auto; padding-top: 14px;
  border-top: 1px solid var(--line);
}
.btn-resume {
  display: flex; align-items: center; gap: 8px;
  width: 100%; padding: 10px 14px; border: 1px solid var(--line);
  border-radius: var(--radius-sm); background: var(--accent-soft);
  color: var(--accent); font-weight: 600; font-size: 12px;
  cursor: pointer; transition: all var(--transition);
}
.btn-resume:hover:not(:disabled) { background: var(--accent); color: #fff; }
.btn-resume:disabled { opacity: 0.4; cursor: not-allowed; background: var(--surface-alt); color: var(--muted); }

.mobile-header { display: none; }

/* ── Main Content ── */
.main-content {
  padding: 24px 28px;
  overflow-y: auto; min-height: 100vh;
  display: flex; flex-direction: column; gap: 20px;
}
.page-hero {
  padding: 4px 0 8px;
}
.hero-text h2 { font-size: 26px; font-weight: 800; margin: 2px 0 4px; }
.eyebrow {
  font-size: 11px; font-weight: 700; letter-spacing: 0.08em;
  text-transform: uppercase; color: var(--muted);
}
.meta-text { color: var(--muted); font-size: 13px; margin: 0; }

/* ── Tab System ── */
.tab-panel { display: none; flex-direction: column; gap: 18px; }
.tab-panel.active { display: flex; }

/* ── Stat Cards ── */
.stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}
.stat-card {
  display: flex; align-items: center; gap: 14px;
  padding: 18px 20px; border-radius: var(--radius);
  background: var(--surface); border: 1px solid var(--line);
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition);
}
.stat-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.stat-icon {
  display: flex; align-items: center; justify-content: center;
  width: 44px; height: 44px; border-radius: 12px; flex-shrink: 0;
}
.stat-icon--blue { background: var(--blue-soft); color: var(--blue); }
.stat-icon--green { background: var(--green-soft); color: var(--green); }
.stat-icon--amber { background: var(--amber-soft); color: var(--amber); }
.stat-icon--purple { background: var(--purple-soft); color: var(--purple); }
.stat-label { display: block; font-size: 12px; color: var(--muted); font-weight: 500; }
.stat-value { display: block; font-size: 22px; font-weight: 800; margin-top: 2px; }

/* ── Cards ── */
.card {
  padding: 20px; border-radius: var(--radius);
  background: var(--surface); border: 1px solid var(--line);
  box-shadow: var(--shadow);
}
.card--narrow { max-width: 640px; }
.card-head {
  display: flex; justify-content: space-between; align-items: start;
  gap: 12px; margin-bottom: 16px;
}
.card-head h3 { font-size: 16px; font-weight: 700; }
.card-head .meta-text { margin-top: 3px; }

.empty-state {
  display: flex; flex-direction: column; align-items: center;
  gap: 10px; text-align: center; padding: 28px 20px;
  color: var(--muted); font-size: 13px;
}

/* ── Session List ── */
.session-list { display: flex; flex-direction: column; gap: 8px; }
.session-row {
  display: flex; justify-content: space-between; align-items: center;
  padding: 14px 16px; border-radius: var(--radius-sm);
  background: var(--surface-alt); border: 1px solid var(--line);
  transition: all var(--transition);
}
.session-row:hover { border-color: var(--accent); transform: translateX(3px); }
.session-row strong { font-size: 13px; }
.session-row p { margin: 3px 0 0; font-size: 12px; color: var(--muted); }
.session-score {
  display: flex; align-items: center; gap: 12px;
  font-size: 13px; color: var(--muted); white-space: nowrap;
}
.session-score .correct { color: var(--green); font-weight: 600; }
.session-score .pct { color: var(--accent); font-weight: 700; font-size: 15px; }

/* ── QBank ── */
.qbank-toolbar {
  display: flex; justify-content: space-between; align-items: center;
  gap: 14px; flex-wrap: wrap;
}
.qbank-toolbar-left, .qbank-toolbar-right {
  display: flex; align-items: center; gap: 8px;
}
.breadcrumbs {
  display: flex; align-items: center; gap: 6px;
  color: var(--muted); font-size: 13px;
}
.crumb {
  border: none; padding: 4px 8px; border-radius: var(--radius-xs);
  background: transparent; cursor: pointer; color: var(--muted);
  font-weight: 500; font-size: 13px;
  transition: all var(--transition);
}
.crumb:hover { color: var(--ink); background: var(--surface-alt); }
.crumb.active { color: var(--ink); font-weight: 600; }
.crumb-current {
  padding: 5px 12px; border-radius: var(--radius-xs);
  background: var(--accent-soft); color: var(--accent);
  font-weight: 600; font-size: 12px;
}
.crumb-current:empty { display: none; }

.search-box {
  display: flex; align-items: center; gap: 8px;
  padding: 7px 12px; border-radius: var(--radius-sm);
  border: 1px solid var(--line); background: var(--surface-alt);
  color: var(--muted);
}
.search-box input {
  border: none; background: transparent; outline: none;
  font-size: 13px; width: 180px; color: var(--ink);
}

.qbank-info { padding: 2px 0; }
.qbank-info h3 { font-size: 18px; font-weight: 700; margin-bottom: 4px; }

.qbank-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 14px;
}
.qbank-card {
  display: flex; flex-direction: column; gap: 14px;
  padding: 18px; border-radius: var(--radius);
  border: 1px solid var(--line); background: var(--surface);
  box-shadow: var(--shadow); cursor: pointer; text-align: left;
  position: relative; overflow: hidden;
  transition: all var(--transition);
}
.qbank-card::before {
  content: ""; position: absolute; inset: 0 0 auto;
  height: 3px; background: linear-gradient(90deg, var(--accent), var(--blue));
  opacity: 0; transition: opacity var(--transition);
}
.qbank-card:hover {
  transform: translateY(-2px); box-shadow: var(--shadow-lg);
  border-color: var(--accent);
}
.qbank-card:hover::before { opacity: 1; }
.qbank-card.disabled { opacity: 0.55; cursor: not-allowed; }
.qbank-card.disabled:hover { transform: none; box-shadow: var(--shadow); border-color: var(--line); }

.qbank-card-top {
  display: flex; justify-content: space-between; align-items: start;
}
.qbank-card-icon {
  display: inline-flex; align-items: center; justify-content: center;
  width: 36px; height: 36px; border-radius: 10px;
  background: var(--accent-soft); color: var(--accent);
  font-size: 11px; font-weight: 800; letter-spacing: 0.05em;
}
.qbank-card-copy { display: flex; flex-direction: column; gap: 4px; }
.qbank-card-copy h3 { font-size: 15px; font-weight: 700; margin: 0; }
.qbank-card-copy p { font-size: 12px; margin: 0; }
.qbank-meta { display: flex; gap: 6px; flex-wrap: wrap; }
.meta-pill {
  padding: 4px 10px; border-radius: 999px;
  background: var(--surface-alt); border: 1px solid var(--line);
  color: var(--muted); font-size: 11px; font-weight: 500;
}
.qbank-card-foot {
  display: flex; justify-content: space-between; align-items: center;
  margin-top: auto; padding: 10px 12px; border-radius: var(--radius-xs);
  background: var(--surface-alt); color: var(--muted); font-size: 12px;
}
.subject-card .qbank-card-icon { background: var(--blue-soft); color: var(--blue); }

/* ── Mix Form ── */
.mix-form { display: flex; flex-direction: column; gap: 16px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.field { display: flex; flex-direction: column; gap: 5px; }
.field span { font-size: 12px; font-weight: 600; color: var(--ink-secondary); }
.field input, .field select {
  padding: 10px 12px; border: 1px solid var(--line);
  border-radius: var(--radius-sm); background: var(--surface-alt);
  font-size: 13px; transition: border-color var(--transition);
}
.field input:focus, .field select:focus {
  outline: none; border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.form-actions { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }

/* ── Mix Subject Grid ── */
.mix-subject-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 6px; max-height: 280px; overflow-y: auto; padding: 8px;
  border: 1px solid var(--line); border-radius: var(--radius-sm);
  background: var(--surface-alt); scrollbar-width: thin;
}
.mix-subject-check {
  display: flex; align-items: center; gap: 8px;
  padding: 8px 10px; border-radius: var(--radius-xs);
  border: 1px solid transparent; cursor: pointer;
  transition: all var(--transition); font-size: 13px;
}
.mix-subject-check:hover { background: var(--surface); border-color: var(--line); }
.mix-subject-check.checked { background: var(--accent-soft); border-color: var(--accent); }
.mix-subject-check input { accent-color: var(--accent); cursor: pointer; }
.mix-subject-check .subject-count { margin-left: auto; font-size: 11px; color: var(--muted); font-weight: 500; }
.mix-select-actions { display: flex; gap: 6px; margin-top: 4px; }


/* ── Settings ── */
.settings-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; max-width: 800px; }
.settings-actions { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 12px; }
.file-upload {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 8px 14px; border: 1px solid var(--line);
  border-radius: var(--radius-sm); background: var(--surface-alt);
  cursor: pointer; font-weight: 500; font-size: 13px;
  transition: all var(--transition);
}
.file-upload:hover { background: var(--surface); border-color: var(--accent); }
.file-upload input[type="file"] { display: none; }

.storage-list { display: flex; flex-direction: column; gap: 6px; }
.progress-row {
  padding: 10px 12px; border-radius: var(--radius-xs);
  background: var(--surface-alt); border: 1px solid var(--line);
}
.progress-row-head {
  display: flex; justify-content: space-between; align-items: center;
  font-size: 13px;
}
.progress-row-head span { font-size: 11px; color: var(--muted); }
.progress-row-meta {
  display: flex; justify-content: space-between; margin-top: 3px;
  font-size: 11px; color: var(--muted);
}

/* ── Modal Dialog ── */
.modal-dialog {
  border: 1px solid var(--line); border-radius: 20px;
  padding: 0; background: transparent;
  width: min(420px, calc(100vw - 24px));
  box-shadow: var(--shadow-lg);
}
.modal-dialog::backdrop { background: rgba(0,0,0,0.35); }
body[data-theme="dark"] .modal-dialog::backdrop { background: rgba(0,0,0,0.55); }
.modal-inner {
  display: grid; gap: 14px; padding: 22px;
  background: var(--surface); border-radius: 20px;
}
.modal-head {
  display: flex; justify-content: space-between; align-items: start; gap: 12px;
}
.modal-head h2 { font-size: 18px; font-weight: 700; margin: 2px 0 0; }

.mode-stack { display: grid; gap: 8px; }
.mode-card {
  display: flex; align-items: center; gap: 12px;
  padding: 14px 16px; border-radius: var(--radius-sm);
  border: 1.5px solid var(--line); background: var(--surface-alt);
  cursor: pointer; transition: all var(--transition); text-align: left;
}
.mode-card div { display: flex; flex-direction: column; gap: 2px; }
.mode-card strong { font-size: 14px; }
.mode-card span { font-size: 12px; color: var(--muted); }
.mode-card svg { flex-shrink: 0; color: var(--muted); }
.mode-card:hover { border-color: var(--accent); }
.mode-card.active {
  border-color: var(--accent); background: var(--accent-soft);
}
.mode-card.active svg { color: var(--accent); }

/* ── Sidebar Overlay (mobile) ── */
.sidebar-overlay {
  position: fixed; inset: 0; z-index: 15;
  background: rgba(0,0,0,0.3);
}

/* ── Responsive ── */
@media (max-width: 1000px) {
  .stats-row { grid-template-columns: repeat(2, 1fr); }
  .settings-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .app-shell { grid-template-columns: 1fr; }
  .sidebar {
    position: fixed; left: 0; top: 0; width: 280px;
    transform: translateX(-100%);
    transition: transform 300ms cubic-bezier(0.22,1,0.36,1);
    z-index: 20;
  }
  .sidebar.open { transform: translateX(0); }
  .mobile-header {
    display: flex; align-items: center; justify-content: space-between;
    gap: 12px; padding: 10px 16px;
    background: var(--surface-glass); backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--line);
    position: sticky; top: 0; z-index: 10;
  }
  .mobile-title { font-size: 16px; font-weight: 800; }
  .main-content { padding: 16px; }
  .hero-text h2 { font-size: 22px; }
  .stats-row { grid-template-columns: 1fr 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .qbank-toolbar { flex-direction: column; align-items: stretch; }
  .qbank-grid { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .stats-row { grid-template-columns: 1fr; }
}

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--line); border-radius: 99px; }
::-webkit-scrollbar-thumb:hover { background: var(--muted); }

/* ── Focus ── */
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }