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

:root {
  --accent: #6366f1;
  --accent-dark: #4f46e5;
  --accent-light: #eef2ff;
  --surface: #ffffff;
  --surface-alt: #f9fafb;
  --border: #e5e7eb;
  --text: #111827;
  --text-muted: #6b7280;
  --text-xmuted: #9ca3af;
  --danger: #ef4444;
  --warn: #f59e0b;
  --success: #10b981;
  --radius: 8px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.05);
  --shadow: 0 4px 12px rgba(0,0,0,.1);
  --shadow-lg: 0 8px 24px rgba(0,0,0,.14);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 14px;
  color: var(--text);
  background: var(--surface-alt);
}

/* ─── Utilities ─── */
.sr-only { position: absolute; width:1px; height:1px; clip:rect(0,0,0,0); overflow:hidden; }
.flex { display: flex; }
.items-center { align-items: center; }
.gap-2 { gap: 8px; }
.gap-3 { gap: 12px; }
.ml-auto { margin-left: auto; }
.w-full { width: 100%; }
.text-muted { color: var(--text-muted); }
.text-sm { font-size: 12px; }
.font-mono { font-family: "SF Mono", "Fira Code", monospace; }
.truncate { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* ─── Layout ─── */
body { min-height: 100vh; }

.nav {
  position: sticky; top: 0; z-index: 40;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  height: 56px;
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 16px;
  box-shadow: var(--shadow-sm);
}

.nav-logo {
  font-size: 16px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: -0.3px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.nav-logo span { color: var(--text); font-weight: 400; }

.page { max-width: 1100px; margin: 0 auto; padding: 32px 24px; }

/* ─── Login ─── */
.login-wrap {
  min-height: calc(100vh - 56px);
  display: flex;
  align-items: center;
  justify-content: center;
}

.login-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 40px;
  width: 100%;
  max-width: 380px;
  box-shadow: var(--shadow);
}
.login-card h1 { font-size: 20px; font-weight: 700; margin-bottom: 4px; }
.login-card p { color: var(--text-muted); margin-bottom: 24px; }

/* ─── Buttons ─── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: var(--radius);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  border: none;
  transition: background 0.15s, box-shadow 0.15s, opacity 0.15s;
  white-space: nowrap;
}
.btn:disabled { opacity: 0.55; cursor: not-allowed; }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover:not(:disabled) { background: var(--accent-dark); }
.btn-ghost { background: transparent; color: var(--text-muted); border: 1px solid var(--border); }
.btn-ghost:hover:not(:disabled) { background: var(--surface-alt); }
.btn-sm { padding: 5px 10px; font-size: 12px; }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover:not(:disabled) { background: #dc2626; }

/* ─── Forms ─── */
.field { display: flex; flex-direction: column; gap: 5px; margin-bottom: 16px; }
.field label { font-size: 12px; font-weight: 600; color: var(--text-muted); text-transform: uppercase; letter-spacing: .4px; display: flex; align-items: center; gap: 6px; }
.info-icon {
  display: inline-flex; align-items: center; justify-content: center;
  width: 14px; height: 14px; border-radius: 50%;
  background: var(--text-muted); color: var(--bg, #1e1e1e);
  font-size: 10px; font-weight: 700; font-family: serif; font-style: italic;
  text-transform: none; cursor: help; user-select: none; opacity: 0.7;
}
.info-icon:hover { opacity: 1; }
.input {
  width: 100%;
  padding: 9px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 14px;
  color: var(--text);
  background: var(--surface);
  transition: border-color 0.15s, box-shadow 0.15s;
  outline: none;
}
.input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(99,102,241,.15); }
.input-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }

/* ─── Badges ─── */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  border-radius: 99px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .2px;
  text-transform: capitalize;
}
.badge-pending { background: #f3f4f6; color: var(--text-muted); }
.badge-active { background: #dbeafe; color: #1d4ed8; }
.badge-submitted { background: #fef3c7; color: #92400e; }
.badge-graded { background: #d1fae5; color: #065f46; }
.badge-poor { background: #fee2e2; color: #991b1b; }

/* ─── Sessions list ─── */
.list-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}
.list-header h2 { font-size: 18px; font-weight: 700; }
.count-chip {
  background: var(--accent-light);
  color: var(--accent);
  font-size: 11px;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 99px;
}

.search-bar { position: relative; flex: 1; min-width: 180px; max-width: 280px; }
.search-bar input { padding-left: 34px; }
.search-bar svg { position: absolute; left: 10px; top: 50%; transform: translateY(-50%); color: var(--text-xmuted); pointer-events: none; }

.table-wrap {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

table { width: 100%; border-collapse: collapse; }
thead th {
  padding: 10px 16px;
  text-align: left;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .5px;
  color: var(--text-muted);
  background: var(--surface-alt);
  border-bottom: 1px solid var(--border);
}
tbody tr {
  border-bottom: 1px solid var(--border);
  cursor: pointer;
  transition: background 0.1s;
}
tbody tr:last-child { border-bottom: none; }
tbody tr:hover { background: var(--accent-light); }
tbody td { padding: 12px 16px; vertical-align: middle; }

.score-pill {
  display: inline-flex;
  align-items: baseline;
  gap: 1px;
  font-weight: 700;
  font-size: 15px;
}
.score-pill .denom { font-size: 11px; font-weight: 400; color: var(--text-muted); }
.score-good { color: var(--success); }
.score-warn { color: var(--warn); }
.score-poor { color: var(--danger); }

.arrow-btn { color: var(--text-xmuted); font-size: 18px; line-height: 1; }

/* ─── Empty / Loading ─── */
.empty-state {
  text-align: center;
  padding: 64px 24px;
  color: var(--text-muted);
}
.empty-state svg { margin-bottom: 12px; opacity: .35; }
.empty-state p { font-size: 15px; }
.empty-state .hint { font-size: 13px; margin-top: 6px; color: var(--text-xmuted); }

.spinner {
  width: 20px; height: 20px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  margin: 0 auto;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ─── Session Detail ─── */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--text-muted);
  font-size: 13px;
  cursor: pointer;
  margin-bottom: 20px;
  transition: color 0.1s;
}
.back-link:hover { color: var(--accent); }

.detail-hero {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 24px;
  margin-bottom: 20px;
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}
.hero-score {
  font-size: 48px;
  font-weight: 800;
  line-height: 1;
  letter-spacing: -1px;
}
.hero-denom { font-size: 20px; font-weight: 400; color: var(--text-muted); }
.hero-meta { flex: 1; min-width: 200px; }
.hero-meta h2 { font-size: 17px; font-weight: 700; margin-bottom: 4px; }
.hero-meta p { color: var(--text-muted); font-size: 13px; }

.detail-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 16px;
}
@media (max-width: 680px) { .detail-grid { grid-template-columns: 1fr; } }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px;
  box-shadow: var(--shadow-sm);
}
.card h3 {
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .5px;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.score-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}
.score-row:last-child { margin-bottom: 0; }
.score-label { font-size: 13px; color: var(--text); width: 160px; flex-shrink: 0; }
.score-bar-wrap { flex: 1; background: var(--surface-alt); border-radius: 99px; height: 6px; overflow: hidden; }
.score-bar { height: 100%; border-radius: 99px; background: var(--accent); transition: width 0.5s ease; }
.score-bar.good { background: var(--success); }
.score-bar.warn { background: var(--warn); }
.score-bar.poor { background: var(--danger); }
.score-val { font-size: 13px; font-weight: 700; width: 24px; text-align: right; flex-shrink: 0; }

.stat-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.stat-item {}
.stat-item .stat-label { font-size: 11px; color: var(--text-xmuted); text-transform: uppercase; letter-spacing: .4px; margin-bottom: 2px; }
.stat-item .stat-val { font-size: 18px; font-weight: 700; }
.stat-item .stat-sub { font-size: 11px; color: var(--text-muted); margin-top: 1px; }

.summary-card { margin-bottom: 16px; }
.summary-line {
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--text);
  word-break: break-word;
  padding: 10px 14px;
  border-left: 3px solid var(--border);
  margin-bottom: 8px;
  background: var(--bg);
  border-radius: 0 6px 6px 0;
}
.summary-line:last-child { margin-bottom: 0; }

.prompts-card { margin-bottom: 16px; }
.prompts-card h3 { display: flex; align-items: center; gap: 8px; }
.prompt-row {
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 10px 12px;
  margin-bottom: 8px;
  background: var(--surface-alt);
}
.prompt-row:last-child { margin-bottom: 0; }
.prompt-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
  flex-wrap: wrap;
}
.prompt-index {
  font-family: "SF Mono", "Fira Code", monospace;
  font-size: 11px;
  color: var(--text-muted);
  font-weight: 700;
}
.prompt-text {
  font-family: "SF Mono", "Fira Code", monospace;
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--text);
  white-space: pre-wrap;
  word-break: break-word;
  margin: 0;
  max-height: 240px;
  overflow-y: auto;
}

/* ─── Invite Drawer ─── */
.overlay {
  position: fixed; inset: 0; z-index: 50;
  background: rgba(0,0,0,.35);
  backdrop-filter: blur(2px);
  display: flex;
  justify-content: flex-end;
}

.drawer {
  background: var(--surface);
  width: 100%;
  max-width: 420px;
  height: 100%;
  overflow-y: auto;
  padding: 28px 28px 40px;
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
}
.drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 28px;
}
.drawer-header h2 { font-size: 17px; font-weight: 700; }
.close-btn {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-muted);
  font-size: 20px;
  line-height: 1;
  padding: 4px;
  border-radius: 4px;
  transition: color 0.1s, background 0.1s;
}
.close-btn:hover { color: var(--text); background: var(--surface-alt); }

.invite-result {
  background: var(--accent-light);
  border: 1px solid #c7d2fe;
  border-radius: var(--radius);
  padding: 14px 16px;
  margin-bottom: 20px;
}
.invite-result p { font-size: 12px; color: var(--text-muted); margin-bottom: 8px; }
.key-row { display: flex; align-items: center; gap: 8px; }
.key-display {
  flex: 1;
  font-family: "SF Mono", monospace;
  font-size: 16px;
  font-weight: 700;
  color: var(--accent-dark);
  letter-spacing: 1px;
  background: var(--surface);
  padding: 8px 12px;
  border-radius: 6px;
  border: 1px solid #c7d2fe;
}

.drawer-actions {
  display: flex;
  gap: 10px;
  margin-top: auto;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}

/* ─── Error banner ─── */
.error-banner {
  background: #fef2f2;
  border: 1px solid #fecaca;
  border-radius: var(--radius);
  padding: 10px 14px;
  color: #b91c1c;
  font-size: 13px;
  margin-bottom: 16px;
}

/* ─── Filter select ─── */
select.input { cursor: pointer; }