@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Space+Grotesk:wght@500;700&display=swap');

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

/* ── Design System Variables — Dark Default ──────────────────────────── */
:root {
  /* Dark glass base */
  --glass-bg:          rgba(15, 20, 40, 0.75);
  --glass-bg-light:    rgba(255, 255, 255, 0.06);
  --glass-border:      rgba(255, 255, 255, 0.10);
  --glass-border-glow: rgba(99, 179, 237, 0.35);

  /* Neon accents */
  --neon-blue:         #63b3ed;
  --neon-cyan:         #4fd1c7;
  --neon-purple:       #b794f4;
  --neon-pink:         #f687b3;
  --neon-green:        #68d391;
  --neon-amber:        #f6ad55;

  /* Deep backgrounds */
  --bg-deep:           #060b18;
  --bg-surface:        #0d1526;
  --bg-card:           rgba(13, 21, 38, 0.85);
  --bg-hover:          rgba(99, 179, 237, 0.08);

  /* Text */
  --text-primary:      #e2e8f0;
  --text-secondary:    #94a3b8;
  --text-muted:        #4a5568;
  --text-accent:       var(--neon-blue);

  /* Status */
  --neon-success:      #68d391;
  --neon-danger:       #fc8181;
  --neon-warning:      #f6ad55;
  --neon-info:         #63b3ed;

  /* Glow */
  --glow-blue:   0 0 20px rgba(99, 179, 237, 0.3), 0 0 40px rgba(99, 179, 237, 0.1);
  --glow-cyan:   0 0 20px rgba(79, 209, 199, 0.3), 0 0 40px rgba(79, 209, 199, 0.1);
  --glow-green:  0 0 20px rgba(104, 211, 145, 0.3);
  --glow-danger: 0 0 20px rgba(252, 129, 129, 0.3);

  /* Animation */
  --transition-fast:   0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
  --transition:        var(--transition-fast);

  /* Layout */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius:    var(--radius-md);
  --blur-glass: blur(16px) saturate(180%);

  /* Legacy variable mapping — dark equivalents so existing component CSS adapts */
  --navy:        var(--neon-blue);
  --navy-dark:   #4a90d9;
  --navy-light:  var(--neon-cyan);
  --white:       var(--bg-card);
  --gray-50:     var(--bg-surface);
  --gray-100:    rgba(255,255,255,0.05);
  --gray-200:    rgba(255,255,255,0.10);
  --gray-400:    var(--text-muted);
  --gray-500:    #64748b;
  --gray-600:    var(--text-secondary);
  --gray-800:    var(--text-primary);
  --green:       var(--neon-success);
  --green-bg:    rgba(104,211,145,0.12);
  --red:         var(--neon-danger);
  --red-bg:      rgba(252,129,129,0.12);
  --amber:       var(--neon-amber);
  --amber-bg:    rgba(246,173,85,0.12);
  --blue:        var(--neon-blue);
  --blue-bg:     rgba(99,179,237,0.12);
  --font:        'Inter', 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
  --shadow:      0 4px 16px rgba(0,0,0,0.4);
  --shadow-md:   0 8px 32px rgba(0,0,0,0.5);
}

/* ── Light Mode Variable Override ────────────────────────────────────── */
[data-theme="light"] {
  --glass-bg:          rgba(255,255,255,0.95);
  --glass-bg-light:    rgba(255,255,255,0.7);
  --glass-border:      #e2e6ea;
  --glass-border-glow: rgba(26,58,92,0.25);
  --neon-blue:         #1a3a5c;
  --neon-cyan:         #2a5a8c;
  --neon-purple:       #5b21b6;
  --neon-pink:         #be185d;
  --neon-green:        #2d8a4e;
  --neon-amber:        #d4840a;
  --bg-deep:           #f5f6f8;
  --bg-surface:        #ffffff;
  --bg-card:           #ffffff;
  --bg-hover:          rgba(26,58,92,0.04);
  --text-primary:      #343a40;
  --text-secondary:    #6c757d;
  --text-muted:        #adb5bd;
  --text-accent:       #1a3a5c;
  --neon-success:      #2d8a4e;
  --neon-danger:       #c0392b;
  --neon-warning:      #d4840a;
  --neon-info:         #3a7bd5;
  --glow-blue:   0 2px 8px rgba(0,0,0,0.10);
  --glow-cyan:   0 2px 8px rgba(0,0,0,0.08);
  --glow-green:  0 2px 6px rgba(0,0,0,0.06);
  --glow-danger: 0 2px 6px rgba(0,0,0,0.06);
  --blur-glass:  none;
  --navy:        #1a3a5c;
  --navy-dark:   #122a44;
  --navy-light:  #2a5a8c;
  --white:       #ffffff;
  --gray-50:     #f5f6f8;
  --gray-100:    #e9ecef;
  --gray-200:    #e2e6ea;
  --gray-400:    #adb5bd;
  --gray-500:    #6c757d;
  --gray-600:    #6c757d;
  --gray-800:    #343a40;
  --green:       #2d8a4e;
  --green-bg:    #d4edda;
  --red:         #c0392b;
  --red-bg:      #fde8e6;
  --amber:       #d4840a;
  --amber-bg:    #fff3cd;
  --blue:        #3a7bd5;
  --blue-bg:     #dce8fb;
  --shadow:      0 2px 8px rgba(0,0,0,0.08);
  --shadow-md:   0 4px 16px rgba(0,0,0,0.12);
}

/* ── Base ───────────────────────────────────────────────────────────────── */
html { font-size: 15px; }
body {
  font-family: var(--font);
  background: var(--bg-deep);
  background-image:
    radial-gradient(ellipse 80% 50% at 20% 10%, rgba(99,179,237,0.07) 0%, transparent 60%),
    radial-gradient(ellipse 60% 40% at 80% 90%, rgba(183,148,244,0.06) 0%, transparent 50%);
  background-attachment: fixed;
  color: var(--text-primary);
  line-height: 1.5;
  min-height: 100vh;
}
[data-theme="light"] body {
  background-image: none;
}
a { color: var(--neon-blue); text-decoration: none; }
a:hover { color: var(--neon-cyan); }
[data-theme="light"] a { color: var(--navy); }
[data-theme="light"] a:hover { color: var(--navy-light); }

/* ── Topbar ─────────────────────────────────────────────────────────────── */
.topbar {
  background: rgba(6, 11, 24, 0.85);
  backdrop-filter: var(--blur-glass);
  -webkit-backdrop-filter: var(--blur-glass);
  border-bottom: 1px solid var(--glass-border);
  box-shadow: 0 1px 0 rgba(99,179,237,0.1);
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  height: 60px;
  position: sticky;
  top: 0;
  z-index: 100;
}
[data-theme="light"] .topbar {
  background: #1a3a5c;
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
  border-bottom-color: transparent;
  box-shadow: 0 2px 8px rgba(0,0,0,0.2);
}

.topbar-brand {
  display: flex; align-items: center; gap: 10px;
  color: var(--text-primary);
  font-weight: 600; font-size: 1.05rem;
  font-family: 'Space Grotesk', sans-serif;
  letter-spacing: -0.3px;
}
[data-theme="light"] .topbar-brand { color: #fff; }

.brand-icon {
  background: linear-gradient(135deg, var(--neon-blue), var(--neon-purple));
  color: #fff;
  border-radius: 8px;
  padding: 4px 8px;
  font-weight: 700; font-size: 0.85rem; letter-spacing: 1px;
  font-family: 'Space Grotesk', sans-serif;
}
[data-theme="light"] .brand-icon { background: rgba(255,255,255,0.15); }

.topbar-right { display: flex; align-items: center; gap: 16px; }
.topbar-link {
  color: var(--text-secondary);
  font-size: 0.875rem;
  transition: color var(--transition-fast);
}
.topbar-link:hover { color: var(--neon-blue); }
.topbar-logout { color: var(--text-muted); }
.topbar-context { font-size: 0.8rem; color: var(--text-muted); }

[data-theme="light"] .topbar-link { color: rgba(255,255,255,0.8); }
[data-theme="light"] .topbar-link:hover { color: #fff; }
[data-theme="light"] .topbar-logout { color: rgba(255,255,255,0.6); }
[data-theme="light"] .topbar-context { color: rgba(255,255,255,0.6); }

.topbar-avatar {
  width: 34px; height: 34px; border-radius: 50%;
  background: linear-gradient(135deg, var(--neon-blue), var(--neon-purple));
  color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: 0.75rem; font-weight: 700;
  cursor: default;
  border: 1px solid var(--glass-border-glow);
  box-shadow: var(--glow-blue);
}
[data-theme="light"] .topbar-avatar {
  background: #2a5a8c;
  border-color: transparent;
  box-shadow: none;
}

/* ── Page wrapper ───────────────────────────────────────────────────────── */
.page-wrapper {
  max-width: 1400px; margin: 0 auto; padding: 28px 24px 48px;
  animation: pageEntrance 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ── Buttons ────────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 8px 18px; border-radius: var(--radius-sm); font-size: 0.875rem; font-weight: 500;
  cursor: pointer; border: none; text-decoration: none;
  transition: all var(--transition-smooth);
  line-height: 1;
  position: relative; overflow: hidden;
}
.btn::after {
  content: ''; position: absolute; inset: 0;
  background: rgba(255,255,255,0.05); opacity: 0;
  transition: opacity var(--transition-fast);
}
.btn:hover::after { opacity: 1; }
.btn:active { transform: scale(0.97); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

.btn-primary {
  background: linear-gradient(135deg, var(--neon-blue), #4a90d9);
  color: #fff;
  border: 1px solid rgba(99,179,237,0.4);
  box-shadow: 0 4px 15px rgba(99,179,237,0.25);
}
.btn-primary:hover {
  box-shadow: 0 6px 25px rgba(99,179,237,0.4), var(--glow-blue);
  transform: translateY(-1px);
  color: #fff;
}
[data-theme="light"] .btn-primary {
  background: var(--navy); color: #fff;
  border-color: var(--navy);
  box-shadow: 0 2px 6px rgba(26,58,92,0.2);
}
[data-theme="light"] .btn-primary:hover {
  background: var(--navy-dark);
  box-shadow: 0 4px 10px rgba(26,58,92,0.3);
  transform: none;
}

.btn-secondary {
  background: var(--glass-bg-light); color: var(--text-secondary);
  border: 1px solid var(--glass-border);
}
.btn-secondary:hover {
  border-color: var(--glass-border-glow);
  color: var(--text-primary);
  background: rgba(255,255,255,0.08);
}
[data-theme="light"] .btn-secondary {
  background: #e9ecef; color: #343a40; border-color: #e2e6ea;
}
[data-theme="light"] .btn-secondary:hover { background: #e2e6ea; }

.btn-danger {
  background: rgba(252,129,129,0.1); color: var(--neon-danger);
  border: 1px solid rgba(252,129,129,0.25);
}
.btn-danger:hover { box-shadow: var(--glow-danger); }
[data-theme="light"] .btn-danger {
  background: #fde8e6; color: #c0392b; border-color: #f5c6cb;
}
[data-theme="light"] .btn-danger:hover { background: #f5c6cb; box-shadow: none; }

.btn-archive {
  background: var(--glass-bg-light); color: var(--text-secondary);
  border: 1px solid var(--glass-border);
}
.btn-archive:hover {
  background: rgba(246,173,85,0.1); color: var(--neon-amber);
  border-color: rgba(246,173,85,0.3);
}
[data-theme="light"] .btn-archive {
  background: #f5f6f8; color: #343a40; border-color: #e2e6ea;
}
[data-theme="light"] .btn-archive:hover { background: #fff3cd; color: #d4840a; border-color: #ffe58f; }

.btn-freeze {
  background: rgba(99,102,241,0.12); color: #818cf8;
  border: 1px solid rgba(99,102,241,0.25);
}
.btn-freeze:hover {
  background: rgba(99,102,241,0.22); color: #a5b4fc;
  border-color: rgba(99,102,241,0.45);
}
[data-theme="light"] .btn-freeze { background: #eef2ff; color: #4338ca; border-color: #c7d2fe; }
[data-theme="light"] .btn-freeze:hover { background: #e0e7ff; color: #3730a3; border-color: #a5b4fc; }

.btn-warning {
  background: rgba(183,148,244,0.1); color: var(--neon-purple);
  border: 1px solid rgba(183,148,244,0.25);
}
.btn-warning:hover { box-shadow: 0 0 20px rgba(183,148,244,0.3); }
[data-theme="light"] .btn-warning {
  background: #ede9fe; color: #6d28d9; border-color: #c4b5fd;
}
[data-theme="light"] .btn-warning:hover { background: #ddd6fe; box-shadow: none; }

.btn-ghost {
  background: transparent; color: var(--text-secondary);
  border: 1px solid var(--glass-border);
}
.btn-ghost:hover { background: var(--glass-bg-light); }
[data-theme="light"] .btn-ghost {
  background: transparent; color: #6c757d; border-color: #e2e6ea;
}
[data-theme="light"] .btn-ghost:hover { background: #e9ecef; }

.btn-block  { width: 100%; }
.btn-sm     { padding: 5px 12px; font-size: 0.8rem; }
.btn-xs     { padding: 3px 8px; font-size: 0.75rem; border-radius: 4px; }

/* ── Forms ──────────────────────────────────────────────────────────────── */
.form-group { display: flex; flex-direction: column; gap: 5px; margin-bottom: 16px; }
.form-group label {
  font-size: 0.8rem; font-weight: 500;
  color: var(--text-secondary);
  text-transform: uppercase; letter-spacing: 0.6px;
}
[data-theme="light"] .form-group label {
  font-size: 0.85rem; font-weight: 600; color: #343a40;
  text-transform: none; letter-spacing: 0;
}

.form-control {
  height: 38px; padding: 0 12px;
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  font-size: 0.9rem; font-family: var(--font);
  background: rgba(255,255,255,0.04);
  color: var(--text-primary);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
  width: 100%;
}
.form-control::placeholder { color: var(--text-muted); }
.form-control:focus {
  outline: none;
  border-color: var(--neon-blue);
  background: rgba(99,179,237,0.05);
  box-shadow: 0 0 0 3px rgba(99,179,237,0.12), var(--glow-blue);
}
[data-theme="light"] .form-control {
  background: #fff; border-color: #ced4da; color: #343a40;
}
[data-theme="light"] .form-control::placeholder { color: #adb5bd; }
[data-theme="light"] .form-control:focus {
  border-color: #2a5a8c; background: #fff;
  box-shadow: 0 0 0 3px rgba(26,58,92,0.15);
}

textarea.form-control  { height: auto; padding: 10px 12px; }
select.form-control    { padding-right: 28px; }
select.form-control option {
  background-color: var(--bg-surface);
  color: var(--text-primary);
}
[data-theme="light"] select.form-control option {
  background-color: #ffffff;
  color: #343a40;
}
.form-hint             { font-size: 0.78rem; color: var(--text-muted); }
.form-row              { display: flex; gap: 16px; flex-wrap: wrap; }
.form-row .form-group  { flex: 1; min-width: 160px; }
.form-row .flex-2      { flex: 2; }
.form-row .form-group-sm { flex: 0 0 110px; }
.form-actions          { display: flex; gap: 10px; align-items: center; margin-top: 24px; }

.form-card {
  background: var(--glass-bg);
  backdrop-filter: var(--blur-glass);
  -webkit-backdrop-filter: var(--blur-glass);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.4);
  transition: border-color var(--transition-smooth), box-shadow var(--transition-smooth);
}
[data-theme="light"] .form-card {
  background: #fff; backdrop-filter: none; -webkit-backdrop-filter: none;
  border-color: #e2e6ea; box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}

.form-section { margin-bottom: 28px; }
.form-section h3 {
  font-size: 1rem; color: var(--neon-blue);
  font-family: 'Space Grotesk', sans-serif;
  margin-bottom: 16px; padding-bottom: 8px;
  border-bottom: 1px solid var(--glass-border);
}
[data-theme="light"] .form-section h3 { color: #1a3a5c; border-bottom-color: #e2e6ea; }

/* ── Alerts ─────────────────────────────────────────────────────────────── */
.alert {
  padding: 12px 16px; border-radius: var(--radius-md);
  margin-bottom: 16px; font-size: 0.875rem;
  border-left: 3px solid; backdrop-filter: blur(8px);
  animation: alertSlide 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}
.alert-success { background: rgba(104,211,145,0.08); border-color: var(--neon-success); color: var(--neon-success); }
.alert-error   { background: rgba(252,129,129,0.08); border-color: var(--neon-danger);  color: var(--neon-danger); }
.alert-info    { background: rgba(99,179,237,0.08);  border-color: var(--neon-info);    color: var(--neon-info); }
[data-theme="light"] .alert { backdrop-filter: none; }
[data-theme="light"] .alert-success { background: #d4edda; border-color: #2d8a4e; color: #2d8a4e; }
[data-theme="light"] .alert-error   { background: #fde8e6; border-color: #c0392b; color: #c0392b; }
[data-theme="light"] .alert-info    { background: #dce8fb; border-color: #1e40af; color: #1e40af; }

/* ── Badges ─────────────────────────────────────────────────────────────── */
.badge {
  display: inline-flex; align-items: center;
  padding: 3px 8px; border-radius: 6px;
  font-size: 0.7rem; font-weight: 600; letter-spacing: 0.5px; text-transform: uppercase;
}
.badge-green { background: rgba(104,211,145,0.12); color: var(--neon-green);  border: 1px solid rgba(104,211,145,0.25); }
.badge-red   { background: rgba(252,129,129,0.12); color: var(--neon-danger); border: 1px solid rgba(252,129,129,0.25); }
.badge-amber { background: rgba(246,173,85,0.12);  color: var(--neon-amber);  border: 1px solid rgba(246,173,85,0.25); }
.badge-blue  { background: rgba(99,179,237,0.12);  color: var(--neon-blue);   border: 1px solid rgba(99,179,237,0.25); }
.badge-gray  { background: rgba(148,163,184,0.1);  color: var(--text-secondary); border: 1px solid var(--glass-border); }
.badge-dr    { background: rgba(183,148,244,0.12); color: var(--neon-purple); border: 1px solid rgba(183,148,244,0.25); font-weight: 700; }

[data-theme="light"] .badge-green { background: #d4edda; color: #2d8a4e; border-color: #b8ddc4; }
[data-theme="light"] .badge-red   { background: #fde8e6; color: #c0392b; border-color: #f5c6cb; }
[data-theme="light"] .badge-amber { background: #fff3cd; color: #d4840a; border-color: #ffe083; }
[data-theme="light"] .badge-blue  { background: #dce8fb; color: #3a7bd5; border-color: #b8d4f5; }
[data-theme="light"] .badge-gray  { background: #e9ecef; color: #6c757d; border-color: #e2e6ea; }
[data-theme="light"] .badge-dr    { background: #ede9fe; color: #5b21b6; border-color: #c4b5fd; }

/* Dropped rows */
.dr-row { opacity: 0.55; }
.dr-row:hover { opacity: 0.75; }
.stat-dr { border-top: 3px solid var(--neon-purple) !important; }
.stat-dr .stat-value { color: var(--neon-purple); }
[data-theme="light"] .stat-dr { border-top-color: #7c3aed !important; }
[data-theme="light"] .stat-dr .stat-value { color: #7c3aed; }

.dropped-notice {
  background: rgba(183,148,244,0.12); color: var(--neon-purple);
  font-size: 0.78rem; font-weight: 600;
  padding: 6px 10px; border-radius: 5px; margin-bottom: 8px;
  display: flex; align-items: center; gap: 6px;
  border: 1px solid rgba(183,148,244,0.25);
}
[data-theme="light"] .dropped-notice { background: #ede9fe; color: #5b21b6; border-color: #c4b5fd; }

.subject-card-dropped {
  border-color: rgba(183,148,244,0.35) !important;
  background: rgba(183,148,244,0.05) !important; opacity: 0.88;
}
[data-theme="light"] .subject-card-dropped { background: #faf5ff !important; border-color: #c4b5fd !important; }

.subject-card-frozen {
  border-color: rgba(99,102,241,0.35) !important;
  background: rgba(99,102,241,0.04) !important;
  cursor: default !important;
}
[data-theme="light"] .subject-card-frozen { background: #eef2ff !important; border-color: #a5b4fc !important; }

.frozen-notice {
  background: rgba(99,102,241,0.12); color: #818cf8;
  font-size: 0.78rem; font-weight: 600;
  padding: 6px 10px; border-radius: 5px; margin-bottom: 8px;
  display: flex; align-items: center; gap: 6px;
  border: 1px solid rgba(99,102,241,0.25);
}
[data-theme="light"] .frozen-notice { background: #eef2ff; color: #4338ca; border-color: #c7d2fe; }

.alert-dr {
  background: rgba(183,148,244,0.08);
  border-left: 4px solid var(--neon-purple); color: var(--neon-purple);
  padding: 12px 16px; border-radius: var(--radius);
  display: flex; align-items: flex-start; gap: 8px; font-size: 0.88rem;
}
[data-theme="light"] .alert-dr { background: #ede9fe; color: #4c1d95; border-left-color: #7c3aed; }

/* ── Tables ─────────────────────────────────────────────────────────────── */
.data-table { width: 100%; border-collapse: collapse; font-size: 0.875rem; }
.data-table th {
  background: rgba(99,179,237,0.08);
  color: var(--text-secondary); padding: 10px 12px; text-align: left;
  font-weight: 600; font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.7px;
  white-space: nowrap; border-bottom: 1px solid var(--glass-border);
}
.data-table td {
  padding: 11px 12px; border-bottom: 1px solid rgba(255,255,255,0.04);
  color: var(--text-primary); font-size: 0.875rem;
}
.data-table tbody tr:last-child td { border-bottom: none; }
.data-table tbody tr:hover td { background: rgba(99,179,237,0.04); }
.data-table tbody tr:nth-child(even) td { background: rgba(255,255,255,0.01); }

.table-wrapper {
  overflow-x: auto; border-radius: var(--radius-md);
  border: 1px solid var(--glass-border);
  box-shadow: 0 8px 32px rgba(0,0,0,0.4); background: var(--bg-card);
}
.table-responsive {
  overflow-x: auto; border-radius: var(--radius-md);
  border: 1px solid var(--glass-border);
  box-shadow: 0 8px 32px rgba(0,0,0,0.4); background: var(--bg-card);
}
tbody tr { transition: background var(--transition-fast); }

[data-theme="light"] .data-table th {
  background: #1a3a5c; color: #fff;
  font-size: 0.82rem; text-transform: none; letter-spacing: 0;
}
[data-theme="light"] .data-table td { border-bottom-color: #e9ecef; }
[data-theme="light"] .data-table tbody tr:hover td { background: #f0f4fa; }
[data-theme="light"] .data-table tbody tr:nth-child(even) td { background: #fafbfd; }
[data-theme="light"] .table-wrapper { background: #fff; border-color: #e2e6ea; box-shadow: 0 2px 8px rgba(0,0,0,0.08); }
[data-theme="light"] .table-responsive { background: #fff; border-color: #e2e6ea; box-shadow: 0 2px 8px rgba(0,0,0,0.08); }
.row-highlight td { animation: rowFlash 2.5s ease forwards; }
@keyframes rowFlash {
  0%, 20% { background: rgba(250,204,21,0.25); }
  100%     { background: transparent; }
}
[data-theme="light"] .row-highlight td { animation: rowFlashLight 2.5s ease forwards; }
@keyframes rowFlashLight {
  0%, 20% { background: rgba(234,179,8,0.18); }
  100%     { background: transparent; }
}

/* ── Stats strip ─────────────────────────────────────────────────────────── */
.stats-strip {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px; margin-bottom: 28px;
}
.stat-card {
  background: var(--glass-bg);
  backdrop-filter: var(--blur-glass);
  -webkit-backdrop-filter: var(--blur-glass);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.4);
  flex: 1; min-width: 130px;
  position: relative; overflow: hidden;
  transition: border-color var(--transition-smooth), box-shadow var(--transition-smooth), transform var(--transition-smooth);
}
.stat-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 2px;
  background: linear-gradient(90deg, var(--neon-blue), var(--neon-purple));
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}
.stat-card:hover {
  border-color: var(--glass-border-glow);
  box-shadow: 0 12px 40px rgba(0,0,0,0.5), var(--glow-blue);
  transform: translateY(-2px);
}
.stat-value {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 2rem; font-weight: 700;
  color: var(--neon-blue);
  text-shadow: 0 0 20px rgba(99,179,237,0.3);
  line-height: 1.1;
  transition: color var(--transition-smooth);
}
.stat-label {
  font-size: 0.78rem; color: var(--text-secondary);
  text-transform: uppercase; letter-spacing: 0.8px; margin-top: 4px;
}
.stat-pass .stat-value { color: var(--neon-green); text-shadow: var(--glow-green); }
.stat-fail .stat-value { color: var(--neon-danger); text-shadow: var(--glow-danger); }
.stat-inc  .stat-value { color: var(--neon-amber); text-shadow: none; }
.stats-strip-sm .stat-card  { padding: 12px 16px; }
.stats-strip-sm .stat-value { font-size: 1.4rem; }

[data-theme="light"] .stat-card {
  background: #fff; backdrop-filter: none; -webkit-backdrop-filter: none;
  border-color: #e2e6ea; box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}
[data-theme="light"] .stat-card::before { display: none; }
[data-theme="light"] .stat-card:hover { box-shadow: 0 4px 16px rgba(0,0,0,0.12); border-color: #2a5a8c; transform: none; }
[data-theme="light"] .stat-value { color: #1a3a5c; text-shadow: none; font-family: var(--font); font-size: 1.8rem; }
[data-theme="light"] .stat-pass .stat-value { color: #2d8a4e; text-shadow: none; }
[data-theme="light"] .stat-fail .stat-value { color: #c0392b; text-shadow: none; }
[data-theme="light"] .stat-inc  .stat-value { color: #d4840a; }

/* ── Modal ──────────────────────────────────────────────────────────────── */
.modal { position: fixed; inset: 0; z-index: 500; display: flex; align-items: center; justify-content: center; }
.modal.hidden { display: none; }
.modal-overlay { position: absolute; inset: 0; background: rgba(0,0,0,0.65); backdrop-filter: blur(4px); }
.modal-box {
  position: relative;
  background: var(--glass-bg);
  backdrop-filter: var(--blur-glass);
  -webkit-backdrop-filter: var(--blur-glass);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg); min-width: 360px; max-width: 500px; width: 90%;
  box-shadow: 0 20px 60px rgba(0,0,0,0.6), var(--glow-blue); overflow: hidden;
}
.modal-box h3 { margin-bottom: 20px; color: var(--neon-blue); }
.modal-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 22px; border-bottom: 1px solid var(--glass-border);
}
.modal-title { font-size: 1rem; font-weight: 700; color: var(--text-primary); margin: 0; font-family: 'Space Grotesk', sans-serif; }
.modal-close { background: none; border: none; font-size: 1.4rem; line-height: 1; cursor: pointer; color: var(--text-muted); padding: 0 4px; transition: color var(--transition-fast); }
.modal-close:hover { color: var(--text-primary); }
.modal-body   { padding: 20px 22px; }
.modal-footer { padding: 14px 22px; border-top: 1px solid var(--glass-border); display: flex; justify-content: flex-end; gap: 10px; }

[data-theme="light"] .modal-overlay  { background: rgba(0,0,0,0.45); backdrop-filter: none; }
[data-theme="light"] .modal-box      { background: #fff; backdrop-filter: none; -webkit-backdrop-filter: none; border-color: #e2e6ea; box-shadow: 0 4px 20px rgba(0,0,0,0.15); }
[data-theme="light"] .modal-box h3   { color: #1a3a5c; }
[data-theme="light"] .modal-title    { color: #1a3a5c; }
[data-theme="light"] .modal-header   { border-bottom-color: #e2e6ea; }
[data-theme="light"] .modal-footer   { border-top-color: #e2e6ea; }
[data-theme="light"] .modal-close    { color: #6c757d; }
[data-theme="light"] .modal-close:hover { color: #343a40; }

/* ── Page header ─────────────────────────────────────────────────────────── */
.page-header { margin-bottom: 20px; }
.page-header h2 { font-size: 1.4rem; color: var(--text-primary); margin-top: 6px; font-family: 'Space Grotesk', sans-serif; }
.back-link { font-size: 0.85rem; color: var(--text-secondary); }
.back-link:hover { color: var(--neon-blue); }
[data-theme="light"] .page-header h2 { color: #1a3a5c; }
[data-theme="light"] .back-link { color: #6c757d; }
[data-theme="light"] .back-link:hover { color: #1a3a5c; }

/* ── Footer ─────────────────────────────────────────────────────────────── */
.site-footer {
  text-align: center; padding: 20px; font-size: 0.8rem;
  color: var(--text-muted); border-top: 1px solid var(--glass-border); margin-top: 40px;
}
[data-theme="light"] .site-footer { color: #adb5bd; border-top-color: #e2e6ea; }

/* ── Auth / Login page ───────────────────────────────────────────────────── */
.auth-page {
  display: flex; align-items: center; justify-content: center;
  min-height: 100vh;
  background: var(--bg-deep);
  background-image:
    radial-gradient(ellipse 80% 50% at 20% 10%, rgba(99,179,237,0.07) 0%, transparent 60%),
    radial-gradient(ellipse 60% 40% at 80% 90%, rgba(183,148,244,0.06) 0%, transparent 50%);
}
[data-theme="light"] .auth-page {
  background: linear-gradient(135deg, #1a3a5c 0%, #2a5a8c 100%);
  background-image: none;
}

.auth-container { width: 100%; max-width: 420px; padding: 20px; }
.auth-card {
  background: rgba(13,21,38,0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl); padding: 40px 36px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.6), var(--glow-blue);
  animation: loginSlideUp 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
}
[data-theme="light"] .auth-card {
  background: #fff; backdrop-filter: none; -webkit-backdrop-filter: none;
  border-color: rgba(255,255,255,0.3); box-shadow: 0 4px 20px rgba(0,0,0,0.15); animation: none;
}

.auth-logo { text-align: center; margin-bottom: 32px; font-family: 'Space Grotesk', sans-serif; }
.logo-icon {
  background: linear-gradient(135deg, var(--neon-blue), var(--neon-purple));
  color: #fff; width: 56px; height: 56px; border-radius: 12px;
  font-size: 1rem; font-weight: 700;
  display: inline-flex; align-items: center; justify-content: center;
  margin-bottom: 12px; box-shadow: var(--glow-blue);
}
[data-theme="light"] .logo-icon { background: #1a3a5c; box-shadow: none; }
.auth-logo h1 {
  font-size: 1.5rem; font-weight: 700;
  background: linear-gradient(135deg, var(--neon-blue), var(--neon-cyan));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
[data-theme="light"] .auth-logo h1 { background: none; -webkit-text-fill-color: #1a3a5c; color: #1a3a5c; }
.auth-logo p { font-size: 0.85rem; color: var(--text-secondary); margin-top: 4px; }
[data-theme="light"] .auth-logo p { color: #6c757d; }
.auth-footer { text-align: center; margin-top: 20px; font-size: 0.85rem; color: var(--text-secondary); }
.auth-footer a { color: var(--neon-blue); }
[data-theme="light"] .auth-footer { color: #6c757d; }
[data-theme="light"] .auth-footer a { color: #1a3a5c; }

/* New login page classes (used by updated auth/login.php) */
.login-page {
  display: flex; align-items: center; justify-content: center;
  min-height: 100vh;
  background: var(--bg-deep);
  background-image:
    radial-gradient(ellipse 80% 50% at 20% 10%, rgba(99,179,237,0.07) 0%, transparent 60%),
    radial-gradient(ellipse 60% 40% at 80% 90%, rgba(183,148,244,0.06) 0%, transparent 50%);
  background-size: 200% 200%;
  animation: bgPulse 8s ease-in-out infinite alternate;
}
.login-wrapper { width: 100%; max-width: 420px; padding: 24px; }
.login-card {
  background: rgba(13,21,38,0.85);
  backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border); border-radius: var(--radius-xl);
  padding: 40px 36px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.6), var(--glow-blue);
  animation: loginSlideUp 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
}
.login-brand { text-align: center; margin-bottom: 32px; font-family: 'Space Grotesk', sans-serif; }
.login-brand h1 {
  font-size: 1.5rem; font-weight: 700;
  background: linear-gradient(135deg, var(--neon-blue), var(--neon-cyan));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.login-brand p { font-size: 0.85rem; color: var(--text-secondary); margin-top: 4px; }

/* ── Alert banner ─────────────────────────────────────────────────────────── */
.alert-banner { border-radius: var(--radius-md); padding: 12px 16px; margin-bottom: 16px; font-size: 0.875rem; }
.alert-amber    { background: rgba(246,173,85,0.1); color: var(--neon-amber); border: 1px solid rgba(246,173,85,0.25); }
.alert-finalized { background: rgba(99,179,237,0.08); color: var(--neon-info); border: 1px solid rgba(99,179,237,0.2); border-radius: var(--radius-md); padding: 10px 14px; }
.alert-info      { background: rgba(99,179,237,0.08); color: var(--neon-info); border: 1px solid rgba(99,179,237,0.2); border-radius: var(--radius-md); padding: 10px 14px; }
.alert-banner ul { margin: 8px 0 0 18px; }
.alert-banner li { margin: 4px 0; }
.banner-toggle { background: none; border: none; color: var(--neon-amber); font-weight: 600; cursor: pointer; font-size: 0.875rem; padding: 0; }

[data-theme="light"] .alert-amber    { background: #fff3cd; color: #d4840a; border-color: #ffe083; }
[data-theme="light"] .alert-finalized { background: #eff6ff; color: #1e40af; border-color: #bfdbfe; }
[data-theme="light"] .alert-info      { background: #eff6ff; color: #1e40af; border-color: #bfdbfe; }

.hidden { display: none !important; }

.finalize-section {
  background: var(--glass-bg); border: 1px solid var(--glass-border);
  border-radius: var(--radius-md); padding: 18px 20px; margin-bottom: 20px;
}
.finalize-section h4 { margin: 0 0 10px; font-size: 0.95rem; color: var(--text-primary); }
[data-theme="light"] .finalize-section { background: #fff; border-color: #e2e6ea; }
[data-theme="light"] .finalize-section h4 { color: #1a3a5c; }

/* ── Save status ─────────────────────────────────────────────────────────── */
.save-status { font-size: 0.8rem; color: var(--text-secondary); transition: opacity var(--transition-fast); }
.save-status.saving { color: var(--neon-info); }
.save-status.saved  { color: var(--neon-success); }
.save-status.error  { color: var(--neon-danger); }

/* ── Info table ──────────────────────────────────────────────────────────── */
.info-table { width: 100%; border-collapse: collapse; }
.info-table th {
  text-align: left; padding: 8px 12px;
  background: var(--bg-surface); border: 1px solid var(--glass-border);
  font-weight: 600; width: 260px; color: var(--text-secondary); font-size: 0.85rem;
}
.info-table td { padding: 8px 12px; border: 1px solid var(--glass-border); font-size: 0.9rem; color: var(--text-primary); }
[data-theme="light"] .info-table th { background: #f5f6f8; border-color: #e2e6ea; color: #6c757d; }
[data-theme="light"] .info-table td { border-color: #e2e6ea; color: #343a40; }

/* ── Empty state ─────────────────────────────────────────────────────────── */
.empty-state { text-align: center; padding: 48px 24px; color: var(--text-secondary); }
.empty-icon { font-size: 3rem; margin-bottom: 12px; }
.empty-state h3 { color: var(--text-primary); margin-bottom: 8px; font-family: 'Space Grotesk', sans-serif; }
.empty-state p { margin-bottom: 16px; }
[data-theme="light"] .empty-state h3 { color: #1a3a5c; }

/* ── Utilities ───────────────────────────────────────────────────────────── */
.text-muted { color: var(--text-secondary); font-size: 0.875rem; }
.risk-badge { font-size: 0.75rem; color: var(--neon-amber); background: rgba(246,173,85,0.12); border-radius: 999px; padding: 2px 8px; white-space: nowrap; }
.risk-flag  { color: var(--neon-amber); margin-left: 4px; }
[data-theme="light"] .risk-badge { background: #fff3cd; color: #d4840a; }

/* ── Theme toggle button ─────────────────────────────────────────────────── */
.theme-toggle {
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--glass-border);
  border-radius: 8px; color: var(--text-secondary);
  padding: 6px 10px; cursor: pointer;
  transition: all var(--transition-fast);
  font-size: 14px; line-height: 1;
  display: flex; align-items: center; justify-content: center;
  width: 34px; height: 34px;
}
.theme-toggle:hover { border-color: var(--neon-blue); color: var(--neon-blue); box-shadow: var(--glow-blue); }
/* Default = dark: show moon icon */
.theme-toggle .icon-sun  { display: none; }
.theme-toggle .icon-moon { display: inline; }
/* Light mode: show sun icon */
[data-theme="light"] .theme-toggle .icon-sun  { display: inline; }
[data-theme="light"] .theme-toggle .icon-moon { display: none; }
[data-theme="light"] .theme-toggle {
  background: rgba(255,255,255,0.12); border-color: rgba(255,255,255,0.2);
  color: rgba(255,255,255,0.9);
}
[data-theme="light"] .theme-toggle:hover {
  background: rgba(255,255,255,0.22); border-color: rgba(255,255,255,0.4);
  color: #fff; box-shadow: none;
}

/* ── Animations ─────────────────────────────────────────────────────────── */
@keyframes pageEntrance {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes alertSlide {
  from { opacity: 0; transform: translateY(-8px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes loginSlideUp {
  from { opacity: 0; transform: translateY(30px) scale(0.96); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}
@keyframes bgPulse {
  from { background-position: 20% 10%; }
  to   { background-position: 80% 90%; }
}
@keyframes cardEntrance {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes shimmer {
  from { background-position: -200% 0; }
  to   { background-position:  200% 0; }
}
@keyframes neonPulse {
  0%, 100% { box-shadow: 0 0 10px rgba(246,173,85,0.2); }
  50%       { box-shadow: 0 0 25px rgba(246,173,85,0.4); }
}
@keyframes gradeFlash {
  0%   { box-shadow: inset 0 0 0 2px var(--neon-blue); }
  100% { box-shadow: none; }
}

.skeleton {
  background: linear-gradient(90deg,
    rgba(255,255,255,0.04) 25%, rgba(255,255,255,0.08) 50%, rgba(255,255,255,0.04) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius-sm);
}
.at-risk-banner { animation: neonPulse 2s ease-in-out infinite; }
.grade-updated  { animation: gradeFlash 0.8s ease; }

:focus-visible { outline: 2px solid var(--neon-blue); outline-offset: 2px; }

/* ── Scrollbar ───────────────────────────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg-surface); }
::-webkit-scrollbar-thumb { background: rgba(99,179,237,0.25); border-radius: 999px; }
::-webkit-scrollbar-thumb:hover { background: rgba(99,179,237,0.5); }
[data-theme="light"] ::-webkit-scrollbar-track { background: #f5f6f8; }
[data-theme="light"] ::-webkit-scrollbar-thumb { background: rgba(26,58,92,0.2); }
[data-theme="light"] ::-webkit-scrollbar-thumb:hover { background: rgba(26,58,92,0.4); }

/* ── Score input (grading sheet) ─────────────────────────────────────────── */
.score-input {
  width: 100%; height: 32px; border: none; background: transparent;
  text-align: center; font-size: 0.82rem; font-family: var(--font);
  color: var(--text-primary); padding: 0 4px;
}
.score-input:focus {
  outline: 2px solid var(--neon-blue); background: rgba(99,179,237,0.1);
  border-radius: 4px;
  box-shadow: 0 0 0 2px rgba(99,179,237,0.2);
}
.score-input:hover { background: rgba(255,255,255,0.05); }
[data-theme="light"] .score-input { color: #343a40; }
[data-theme="light"] .score-input:focus { background: #fff; outline-color: #2a5a8c; box-shadow: 0 0 0 2px rgba(26,58,92,0.15); }
[data-theme="light"] .score-input:hover { background: rgba(0,0,0,0.03); }

/* ── Mobile / Responsive ─────────────────────────────────────────────────── */
@media (max-width: 768px) {
  .topbar { flex-wrap: wrap; gap: 6px; padding: 8px 12px; height: auto; }
  .topbar-right { flex-wrap: wrap; gap: 6px; }
  .topbar-context { display: none; }
  .brand-text { font-size: 0.85rem; }
  .page-wrapper { padding: 12px; }
  .stats-strip { grid-template-columns: repeat(2, 1fr); gap: 8px; }
  .stat-card { padding: 12px 14px; }
  .stat-value { font-size: 1.5rem; }
  .form-row { flex-direction: column; }
  .table-wrapper, .table-responsive { overflow-x: auto; -webkit-overflow-scrolling: touch; }
  .btn-block { width: 100%; }
  .auth-container, .login-wrapper { padding: 12px; }
  .auth-card, .login-card { padding: 24px 18px; }
  .tab-nav { overflow-x: auto; white-space: nowrap; -webkit-overflow-scrolling: touch; }
  .tab-link { padding: 8px 12px; font-size: 0.82rem; }
  .settings-actions { flex-direction: column; align-items: stretch; }
  .settings-actions .btn { text-align: center; }
  .student-subjects-grid { grid-template-columns: 1fr; }
  .cr-header { flex-direction: column; gap: 10px; }
  .cr-header-actions { display: flex; flex-wrap: wrap; gap: 6px; }
  .export-grid { grid-template-columns: 1fr; }
  .modal-box { margin: 12px; width: calc(100% - 24px); max-height: 90vh; overflow-y: auto; }
  .sig-section { flex-direction: column; gap: 20px; }
}
@media (max-width: 480px) {
  .stats-strip { grid-template-columns: 1fr 1fr; }
  .topbar-link:not(.topbar-logout) { display: none; }
  .brand-icon { width: 28px; height: 28px; font-size: 0.7rem; }
  .page-header h2 { font-size: 1.1rem; }
}