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

:root {
  --bg:        #ffffff;
  --bg2:       #f8f9fa;
  --border:    #e5e7eb;
  --text:      #1a1a2e;
  --muted:     #6b7280;
  --primary:   #2563eb;
  --primary-h: #1d4ed8;
  --radius:    8px;
  --font:      -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

[data-theme="dark"] {
  --bg:        #111;
  --bg2:       #1a1a1a;
  --border:    #2a2a2a;
  --text:      #eee;
  --muted:     #888;
}

html { font-size: 15px; scroll-behavior: smooth; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex; flex-direction: column;
  line-height: 1.5;
}

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ── Container ──────────────────────────────────────────── */
.container { max-width: 960px; margin: 0 auto; padding: 0 20px; }

/* ── Navbar (fixed height = 52px) ───────────────────────── */
.navbar {
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 100;
  height: 52px;
}
.navbar .container {
  display: flex; align-items: center; justify-content: space-between;
  height: 52px; gap: 12px;
}
.logo {
  font-weight: 700; font-size: 1rem; color: var(--text) !important;
  display: flex; align-items: center; gap: 8px;
}
.logo svg { width: 20px; height: 20px; color: var(--primary); flex-shrink: 0; }
.nav-links { display: flex; align-items: center; gap: 2px; flex-wrap: wrap; }
.nav-links a {
  color: var(--muted); padding: 6px 12px; border-radius: 6px;
  font-size: .85rem; font-weight: 500;
}
.nav-links a:hover { color: var(--text); background: var(--bg2); text-decoration: none; }
.nav-links a.active { color: var(--primary); background: transparent; }
.theme-btn {
  background: none; border: 1px solid var(--border);
  color: var(--text); border-radius: 6px; padding: 6px 10px;
  cursor: pointer; font-size: .85rem;
}
.theme-btn:hover { background: var(--bg2); }

/* ── Breadcrumb ─────────────────────────────────────────── */
.breadcrumb {
  font-size: .82rem; color: var(--muted); margin-bottom: 12px;
}
.breadcrumb a { color: var(--muted); }
.breadcrumb a:hover { color: var(--primary); }

/* ── Main ───────────────────────────────────────────────── */
main { flex: 1; padding: 28px 0 48px; }
.footer {
  border-top: 1px solid var(--border);
  padding: 20px; text-align: center; color: var(--muted); font-size: .8rem;
}

/* ── Messages ───────────────────────────────────────────── */
.messages { margin-bottom: 20px; display: flex; flex-direction: column; gap: 8px; }
.msg { padding: 12px 16px; border-radius: var(--radius); font-size: .85rem; }
.msg-success { background: #ecfdf5; color: #065f46; border: 1px solid #a7f3d0; }
.msg-error   { background: #fef2f2; color: #991b1b; border: 1px solid #fecaca; }

/* ── Page header ────────────────────────────────────────── */
.page-header { margin-bottom: 20px; }
.page-header h1 { font-size: 1.5rem; font-weight: 700; }
.page-header p  { color: var(--muted); margin-top: 4px; font-size: .9rem; }

/* ── Cards ──────────────────────────────────────────────── */
.card {
  background: var(--bg); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 22px; margin-bottom: 18px;
}
.card h2 { font-size: 1rem; font-weight: 700; margin-bottom: 16px; }

/* ── Date form ──────────────────────────────────────────── */
.date-form {
  display: flex; align-items: center; gap: 10px;
  margin-bottom: 16px; font-size: .9rem; font-weight: 600;
}
.date-form select {
  padding: 6px 12px; border: 1px solid var(--border);
  border-radius: 6px; background: var(--bg); color: var(--text);
  font-size: .88rem; outline: none;
}

/* ── Search ─────────────────────────────────────────────── */
.search-box { margin-bottom: 16px; }
.search-box input {
  width: 100%; max-width: 360px; padding: 10px 14px;
  background: var(--bg); border: 1px solid var(--border);
  border-radius: 6px; color: var(--text); font-size: .88rem; outline: none;
}
.search-box input:focus { border-color: var(--primary); }

/* ── Group grid ─────────────────────────────────────────── */
.group-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 8px;
}
.group-grid a {
  display: block; padding: 14px;
  background: var(--bg); border: 1px solid var(--border);
  border-radius: 6px; color: var(--text); font-weight: 600;
  font-size: .88rem; text-align: center;
}
.group-grid a:hover { border-color: var(--primary); text-decoration: none; }

/* ── Date tabs ──────────────────────────────────────────── */
.date-tabs { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 20px; }
.date-tab {
  padding: 8px 16px; border-radius: 6px; font-size: .82rem;
  font-weight: 600; cursor: pointer; border: 1px solid var(--border);
  background: var(--bg); color: var(--muted); white-space: nowrap;
}
.date-tab:hover { border-color: var(--primary); color: var(--primary); }
.date-tab.active { background: var(--primary); border-color: var(--primary); color: #fff; }

/* ── Table ──────────────────────────────────────────────── */
.table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--radius); }
table { width: 100%; border-collapse: collapse; font-size: .88rem; }
thead th {
  background: var(--bg2); color: var(--muted);
  font-size: .75rem; font-weight: 600; text-transform: uppercase;
  letter-spacing: .04em; padding: 10px 14px; text-align: left;
  border-bottom: 2px solid var(--border);
  position: sticky; top: 52px; z-index: 10;
}
td { padding: 10px 14px; border-bottom: 1px solid var(--border); vertical-align: middle; }
tr:last-child td { border-bottom: none; }
tbody tr:hover { background: var(--bg2); }

/* ── Badges ─────────────────────────────────────────────── */
.badge-pair {
  background: var(--primary); color: #fff;
  width: 28px; height: 28px; border-radius: 6px;
  display: inline-flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: .8rem; flex-shrink: 0;
}
.badge-sub {
  background: var(--bg2); color: var(--muted);
  border: 1px solid var(--border); border-radius: 4px;
  padding: 1px 6px; font-size: .72rem; font-weight: 600; margin-left: 4px;
}
.badge-room {
  background: var(--bg2); color: var(--muted);
  padding: 2px 8px; border-radius: 4px; font-size: .78rem; font-weight: 500;
}
.badge-room.remote { background: #dbeafe; color: #1e40af; }
.pair-cell { display: flex; align-items: center; gap: 8px; }
.pair-time { color: var(--muted); font-size: .72rem; white-space: nowrap; }

/* ── Buttons ────────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 8px 18px; border-radius: 6px; font-size: .85rem;
  font-weight: 600; border: none; cursor: pointer;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-h); }
.btn-danger  { background: #dc2626; color: #fff; }
.btn-danger:hover { background: #b91c1c; }
.btn-ghost   { background: var(--bg); color: var(--text); border: 1px solid var(--border); }
.btn-ghost:hover { border-color: var(--primary); color: var(--primary); }
.btn-sm { padding: 5px 12px; font-size: .78rem; }

/* ── Auth ───────────────────────────────────────────────── */
.auth-page { display: flex; justify-content: center; padding: 40px 16px; }
.auth-card {
  background: var(--bg); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 32px 28px;
  width: 100%; max-width: 400px;
}
.auth-header { text-align: center; margin-bottom: 24px; }
.auth-header h1 { font-size: 1.3rem; font-weight: 700; }
.auth-subtitle { color: var(--muted); font-size: .85rem; margin-top: 4px; }
.auth-form { display: flex; flex-direction: column; gap: 16px; }
.form-group { display: flex; flex-direction: column; gap: 4px; }
.form-group label { font-size: .85rem; font-weight: 600; }
.form-group input {
  background: var(--bg); border: 1px solid var(--border);
  border-radius: 6px; padding: 10px 14px;
  color: var(--text); font-size: .9rem; outline: none;
}
.form-group input:focus { border-color: var(--primary); }
.auth-footer { margin-top: 20px; text-align: center; font-size: .85rem; color: var(--muted); }

/* ── Stats ──────────────────────────────────────────────── */
.stats-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); gap: 10px; }
.stat-card {
  background: var(--bg); border: 1px solid var(--border);
  border-radius: 6px; padding: 18px; text-align: center;
}
.stat-card .num { font-size: 1.5rem; font-weight: 700; color: var(--primary); }
.stat-card .lbl { color: var(--muted); font-size: .78rem; margin-top: 4px; }

/* ── Feedback ───────────────────────────────────────────── */
.feedback-page { max-width: 600px; margin: 2rem auto; }
.feedback-form { display: flex; flex-direction: column; gap: 16px; }
.category-btns { display: flex; flex-wrap: wrap; gap: 8px; }
.cat-btn input { display: none; }
.cat-btn span {
  display: inline-block; padding: 8px 16px;
  border: 1px solid var(--border); border-radius: 6px;
  cursor: pointer; font-size: .85rem; font-weight: 500;
}
.cat-btn input:checked + span { border-color: var(--primary); color: var(--primary); }

/* ── Conspects ──────────────────────────────────────────── */
.subject-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 12px; }
.subject-card {
  display: flex; align-items: center; gap: 14px;
  background: var(--bg); border: 1px solid var(--border);
  border-radius: 6px; padding: 18px; text-decoration: none; color: var(--text);
}
.subject-card:hover { border-color: var(--primary); }
.subject-card__icon { font-size: 1.5rem; flex-shrink: 0; }
.subject-card__body { flex: 1; min-width: 0; }
.subject-card__name { font-weight: 600; font-size: .92rem; }
.subject-card__meta { font-size: .78rem; color: var(--muted); margin-top: 2px; }

.files-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 12px; }
.file-card {
  background: var(--bg); border: 1px solid var(--border);
  border-radius: 6px; padding: 18px;
}
.file-card:hover { border-color: var(--primary); }
.file-type-badge { padding: 3px 12px; border-radius: 20px; font-size: .75rem; font-weight: 600; }
.type-conspect { background: #dbeafe; color: #1e40af; }
.type-hw       { background: #d1fae5; color: #065f46; }
.type-other    { background: var(--bg2); color: var(--muted); }
.btn-download {
  border: 1px solid var(--primary); color: var(--primary);
  padding: 6px 16px; border-radius: 6px; font-size: .82rem; font-weight: 600;
  background: none; display: inline-block;
}
.btn-download:hover { background: var(--primary); color: #fff; text-decoration: none; }

/* ── Empty ──────────────────────────────────────────────── */
.empty { text-align: center; padding: 48px 20px; color: var(--muted); }
.empty-icon { font-size: 3rem; margin-bottom: 12px; }

/* ── Mobile ─────────────────────────────────────────────── */
@media (max-width: 768px) {
  .container { padding: 0 14px; }
  td, th { padding: 8px 10px; font-size: .8rem; }
  .group-grid { grid-template-columns: repeat(auto-fill, minmax(130px, 1fr)); }
  .subject-grid, .files-grid { grid-template-columns: 1fr; }
}