/* =============================================================================
   SMARTCURRICULUM – Global Stylesheet
   Modern dark/light theme with glassmorphism, gradients & micro-animations
   ============================================================================= */

/* ── Google Fonts ────────────────────────────────────────────────────────────── */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=Space+Grotesk:wght@400;500;600;700&display=swap');

/* ── CSS Custom Properties ───────────────────────────────────────────────────── */
:root {
  /* Palette – Dark (default) */
  --bg-primary:       #0d0f1a;
  --bg-secondary:     #131629;
  --bg-card:          rgba(255,255,255,0.05);
  --bg-card-hover:    rgba(255,255,255,0.09);
  --border-color:     rgba(255,255,255,0.08);
  --border-active:    rgba(99,102,241,0.6);

  --text-primary:     #f1f5f9;
  --text-secondary:   #94a3b8;
  --text-muted:       #64748b;

  --accent-1:         #6366f1;   /* indigo */
  --accent-2:         #8b5cf6;   /* violet */
  --accent-3:         #06b6d4;   /* cyan */
  --accent-success:   #10b981;
  --accent-warning:   #f59e0b;
  --accent-danger:    #ef4444;

  --gradient-brand:   linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #06b6d4 100%);
  --gradient-card:    linear-gradient(135deg, rgba(99,102,241,0.15) 0%, rgba(139,92,246,0.08) 100%);
  --gradient-success: linear-gradient(135deg, #10b981, #059669);
  --gradient-danger:  linear-gradient(135deg, #ef4444, #dc2626);
  --gradient-warning: linear-gradient(135deg, #f59e0b, #d97706);

  --shadow-sm:        0 2px 8px rgba(0,0,0,0.3);
  --shadow-md:        0 8px 32px rgba(0,0,0,0.4);
  --shadow-lg:        0 20px 60px rgba(0,0,0,0.5);
  --shadow-glow:      0 0 40px rgba(99,102,241,0.25);

  --radius-sm:        8px;
  --radius-md:        14px;
  --radius-lg:        20px;
  --radius-xl:        28px;
  --radius-full:      9999px;

  --font-body:        'Inter', sans-serif;
  --font-display:     'Space Grotesk', sans-serif;

  --transition-fast:  0.15s ease;
  --transition-base:  0.25s ease;
  --transition-slow:  0.4s ease;

  --navbar-h:         68px;
}

/* Light Theme Override */
[data-theme="light"] {
  --bg-primary:       #f8faff;
  --bg-secondary:     #eef2ff;
  --bg-card:          rgba(255,255,255,0.85);
  --bg-card-hover:    rgba(255,255,255,1);
  --border-color:     rgba(99,102,241,0.15);
  --border-active:    #6366f1;

  --text-primary:     #1e1b4b;
  --text-secondary:   #4338ca;
  --text-muted:       #6b7280;

  --shadow-sm:        0 2px 8px rgba(99,102,241,0.1);
  --shadow-md:        0 8px 32px rgba(99,102,241,0.12);
  --shadow-lg:        0 20px 60px rgba(99,102,241,0.14);
  --shadow-glow:      0 0 40px rgba(99,102,241,0.15);
}

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

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--font-body);
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  transition: background var(--transition-slow), color var(--transition-slow);
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
img, svg { display: block; max-width: 100%; }
button { cursor: pointer; border: none; outline: none; font-family: inherit; }
input, select, textarea { font-family: inherit; }

/* ── Utility ─────────────────────────────────────────────────────────────────── */
.hidden   { display: none !important; }
.sr-only  { position: absolute; width: 1px; height: 1px; clip: rect(0,0,0,0); }
.flex     { display: flex; }
.flex-col { display: flex; flex-direction: column; }
.items-center   { align-items: center; }
.justify-center { justify-content: center; }
.justify-between{ justify-content: space-between; }
.gap-1  { gap: 4px;  }
.gap-2  { gap: 8px;  }
.gap-3  { gap: 12px; }
.gap-4  { gap: 16px; }
.gap-6  { gap: 24px; }
.text-center { text-align: center; }
.w-full  { width: 100%; }
.mt-auto { margin-top: auto; }

/* ── Animated Background ─────────────────────────────────────────────────────── */
.bg-animated {
  position: fixed; inset: 0; z-index: -1; overflow: hidden;
}
.bg-animated::before,
.bg-animated::after {
  content: '';
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.12;
  animation: bgFloat 12s ease-in-out infinite;
}
.bg-animated::before {
  width: 600px; height: 600px;
  background: radial-gradient(circle, #6366f1, #8b5cf6);
  top: -100px; left: -100px;
}
.bg-animated::after {
  width: 500px; height: 500px;
  background: radial-gradient(circle, #06b6d4, #6366f1);
  bottom: -100px; right: -100px;
  animation-delay: -6s;
}
@keyframes bgFloat {
  0%, 100% { transform: translate(0, 0) scale(1);   }
  33%       { transform: translate(40px, 30px) scale(1.05); }
  66%       { transform: translate(-20px, 50px) scale(0.95); }
}

/* ── Navbar ──────────────────────────────────────────────────────────────────── */
.navbar {
  position: sticky; top: 0; z-index: 100;
  height: var(--navbar-h);
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 24px;
  background: rgba(13,15,26,0.8);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
}
[data-theme="light"] .navbar { background: rgba(248,250,255,0.85); }

.navbar-brand {
  display: flex; align-items: center; gap: 10px;
}
.navbar-logo {
  width: 36px; height: 36px;
  background: var(--gradient-brand);
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  font-size: 18px; font-weight: 800; color: #fff;
}
.navbar-title {
  font-family: var(--font-display);
  font-size: 1.1rem; font-weight: 700;
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.navbar-actions {
  display: flex; align-items: center; gap: 12px;
}

/* ── Theme Toggle ────────────────────────────────────────────────────────────── */
.theme-toggle {
  width: 40px; height: 40px; border-radius: var(--radius-full);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  display: flex; align-items: center; justify-content: center;
  font-size: 18px;
  transition: all var(--transition-base);
}
.theme-toggle:hover { background: var(--bg-card-hover); transform: rotate(20deg); }

/* ── Buttons ─────────────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 11px 22px;
  border-radius: var(--radius-md);
  font-size: 0.9rem; font-weight: 600;
  transition: all var(--transition-base);
  position: relative; overflow: hidden;
  white-space: nowrap;
}
.btn::after {
  content: '';
  position: absolute; inset: 0;
  background: rgba(255,255,255,0.1);
  opacity: 0; transition: opacity var(--transition-fast);
}
.btn:hover::after { opacity: 1; }
.btn:active { transform: scale(0.97); }

.btn-primary {
  background: var(--gradient-brand);
  color: #fff;
  box-shadow: 0 4px 20px rgba(99,102,241,0.4);
}
.btn-primary:hover { box-shadow: 0 6px 28px rgba(99,102,241,0.6); transform: translateY(-1px); }

.btn-outline {
  background: transparent;
  border: 1.5px solid var(--border-active);
  color: var(--accent-1);
}
.btn-outline:hover { background: rgba(99,102,241,0.1); }

.btn-success {
  background: var(--gradient-success);
  color: #fff;
  box-shadow: 0 4px 16px rgba(16,185,129,0.3);
}
.btn-success:hover { box-shadow: 0 6px 24px rgba(16,185,129,0.5); transform: translateY(-1px); }

.btn-danger {
  background: var(--gradient-danger);
  color: #fff;
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
}
.btn-ghost:hover { background: var(--bg-card); color: var(--text-primary); }

.btn-sm  { padding: 8px 16px; font-size: 0.82rem; border-radius: var(--radius-sm); }
.btn-lg  { padding: 14px 32px; font-size: 1rem; border-radius: var(--radius-lg); }
.btn-xl  { padding: 18px 40px; font-size: 1.1rem; border-radius: var(--radius-xl); font-family: var(--font-display); }
.btn-block { width: 100%; }

.btn:disabled, .btn[disabled] {
  opacity: 0.5; cursor: not-allowed; pointer-events: none;
}

.btn-ghost.active {
  background: var(--accent-1);
  color: #fff;
  border-color: var(--accent-1);
}

/* Loading spinner inside button */
.btn .spinner {
  width: 16px; height: 16px;
  border: 2px solid rgba(255,255,255,0.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

/* ── Cards ───────────────────────────────────────────────────────────────────── */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  backdrop-filter: blur(20px);
  transition: all var(--transition-base);
}
.card:hover { border-color: var(--border-active); box-shadow: var(--shadow-glow); }

.card-gradient {
  background: var(--gradient-card);
  border: 1px solid rgba(99,102,241,0.2);
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  backdrop-filter: blur(20px);
  display: flex; flex-direction: column; gap: 8px;
  position: relative; overflow: hidden;
  transition: all var(--transition-base);
}
.stat-card::before {
  content: '';
  position: absolute; top: 0; left: 0; right: 0; height: 3px;
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
}
.stat-card.blue::before   { background: var(--gradient-brand); }
.stat-card.green::before  { background: var(--gradient-success); }
.stat-card.red::before    { background: var(--gradient-danger); }
.stat-card.amber::before  { background: var(--gradient-warning); }
.stat-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }

.stat-icon   { font-size: 2rem; margin-bottom: 4px; }
.stat-value  { font-family: var(--font-display); font-size: 2.2rem; font-weight: 700; line-height: 1; }
.stat-label  { font-size: 0.85rem; color: var(--text-muted); font-weight: 500; }

/* ── Form Elements ───────────────────────────────────────────────────────────── */
.form-group { display: flex; flex-direction: column; gap: 6px; }

.form-label {
  font-size: 0.85rem; font-weight: 600;
  color: var(--text-secondary);
  letter-spacing: 0.02em;
}

.form-input, .form-select {
  width: 100%;
  padding: 12px 16px;
  background: var(--bg-card);
  border: 1.5px solid var(--border-color);
  border-radius: var(--radius-md);
  color: #fff; /* Ensure text is white for contrast */
  font-size: 0.95rem;
  transition: all var(--transition-base);
  outline: none;
}

.form-select option {
  background: var(--bg-secondary);
  color: #fff;
}
.form-input:focus, .form-select:focus {
  border-color: var(--accent-1);
  box-shadow: 0 0 0 3px rgba(99,102,241,0.15);
}
.form-input::placeholder { color: var(--text-muted); }

.form-input.error { border-color: var(--accent-danger); }
.form-error { font-size: 0.8rem; color: var(--accent-danger); }

/* Create Course Prompt */
.create-course-prompt {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 16px;
  padding: 14px 16px;
  background: rgba(99, 102, 241, 0.04);
  border: 1px dashed var(--border-active);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
}

.create-course-prompt:hover {
  background: rgba(99, 102, 241, 0.08);
  border-style: solid;
  transform: translateY(-1px);
}

.prompt-icon { font-size: 1.2rem; filter: drop-shadow(0 0 8px rgba(255,185,0,0.5)); }
.prompt-text {
  flex: 1;
  font-size: 0.88rem;
  font-weight: 700;
  color: #fff; /* Maximum contrast for prompt */
  line-height: 1.3;
}

.prompt-subtext {
  display: block;
  font-size: 0.72rem;
  font-weight: 400;
  color: rgba(255,255,255,0.7);
  margin-top: 1px;
}

.btn-add-course {
  background: var(--gradient-brand);
  color: #fff;
  padding: 8px 14px;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.78rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.25);
  transition: all var(--transition-base);
}

.btn-add-course:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(99, 102, 241, 0.4);
}

.btn-add-course:active { transform: translateY(0); }

/* ── Badge ───────────────────────────────────────────────────────────────────── */
.badge {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 4px 10px; border-radius: var(--radius-full);
  font-size: 0.75rem; font-weight: 600;
}
.badge-success { background: rgba(16,185,129,0.15); color: #10b981; }
.badge-danger  { background: rgba(239,68,68,0.15);  color: #ef4444; }
.badge-warning { background: rgba(245,158,11,0.15); color: #f59e0b; }
.badge-info    { background: rgba(99,102,241,0.15); color: #6366f1; }

/* ── Toast Notifications ─────────────────────────────────────────────────────── */
#toast-container {
  position: fixed; bottom: 24px; right: 24px;
  z-index: 999; display: flex; flex-direction: column; gap: 12px;
}
.toast {
  display: flex; align-items: center; gap: 12px;
  padding: 14px 20px;
  border-radius: var(--radius-md);
  backdrop-filter: blur(20px);
  box-shadow: var(--shadow-md);
  min-width: 280px; max-width: 400px;
  animation: toastIn 0.35s cubic-bezier(0.22, 1, 0.36, 1);
  border: 1px solid var(--border-color);
}
.toast-success { background: rgba(16,185,129,0.15); border-color: rgba(16,185,129,0.3); }
.toast-error   { background: rgba(239,68,68,0.15);  border-color: rgba(239,68,68,0.3);  }
.toast-info    { background: rgba(99,102,241,0.15); border-color: rgba(99,102,241,0.3); }
.toast-icon    { font-size: 1.3rem; }
.toast-msg     { font-size: 0.9rem; font-weight: 500; flex: 1; }
.toast-close   { font-size: 1.1rem; cursor: pointer; opacity: 0.6; }
.toast-close:hover { opacity: 1; }

@keyframes toastIn {
  from { transform: translateX(100%); opacity: 0; }
  to   { transform: translateX(0);    opacity: 1; }
}

/* ── Loading Overlay ─────────────────────────────────────────────────────────── */
.loading-overlay {
  position: fixed; inset: 0; z-index: 200;
  background: rgba(13,15,26,0.85);
  backdrop-filter: blur(8px);
  display: flex; align-items: center; justify-content: center;
  flex-direction: column; gap: 20px;
}
.loading-text {
  font-family: var(--font-display); font-size: 1rem;
  color: var(--text-secondary); font-weight: 500;
}
.loader {
  width: 48px; height: 48px;
  border: 3px solid var(--border-color);
  border-top-color: var(--accent-1);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Page Layout ─────────────────────────────────────────────────────────────── */
.page-container   { min-height: 100vh; display: flex; flex-direction: column; }
.content-area     { flex: 1; padding: 32px 24px; max-width: 1200px; margin: 0 auto; width: 100%; }
.section-title    { font-family: var(--font-display); font-size: 1.3rem; font-weight: 700; margin-bottom: 20px; }
.section-subtitle { font-size: 0.9rem; color: var(--text-secondary); margin-top: 4px; }

/* Grid layouts */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.grid-auto { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 20px; }

/* ── Landing Page ────────────────────────────────────────────────────────────── */
.hero {
  min-height: calc(100vh - var(--navbar-h));
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  text-align: center; padding: 60px 24px;
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(99,102,241,0.15);
  border: 1px solid rgba(99,102,241,0.3);
  border-radius: var(--radius-full);
  padding: 6px 16px; margin-bottom: 28px;
  font-size: 0.82rem; font-weight: 600; color: var(--accent-1);
}
.hero-badge .dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--accent-success);
  animation: pulse 2s infinite;
}
.hero-title {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 6vw, 4.5rem);
  font-weight: 800; line-height: 1.1;
  margin-bottom: 24px;
}
.hero-title .gradient-text {
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-desc {
  font-size: clamp(1rem, 2vw, 1.18rem);
  color: var(--text-secondary); max-width: 640px;
  line-height: 1.7; margin-bottom: 40px;
}
.hero-cta { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; justify-content: center; }

.features-section { padding: 80px 24px; max-width: 1200px; margin: 0 auto; }
.features-grid    { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 24px; }

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  backdrop-filter: blur(16px);
  transition: all var(--transition-base);
}
.feature-card:hover {
  transform: translateY(-5px);
  border-color: var(--accent-1);
  box-shadow: var(--shadow-glow);
}
.feature-icon {
  width: 52px; height: 52px; border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center;
  font-size: 24px; margin-bottom: 16px;
  background: rgba(99,102,241,0.12);
}
.feature-title { font-family: var(--font-display); font-size: 1.05rem; font-weight: 700; margin-bottom: 8px; }
.feature-desc  { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.6; }

/* ── Login Page ──────────────────────────────────────────────────────────────── */
.auth-page {
  min-height: 100vh; display: flex; align-items: center; justify-content: center;
  padding: 24px;
}
.auth-card {
  width: 100%; max-width: 440px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 40px 36px;
  backdrop-filter: blur(24px);
  box-shadow: var(--shadow-lg);
}
.auth-logo {
  width: 56px; height: 56px; border-radius: var(--radius-md);
  background: var(--gradient-brand);
  display: flex; align-items: center; justify-content: center;
  font-size: 24px; color: #fff; font-weight: 800;
  margin: 0 auto 20px;
}
.auth-title {
  font-family: var(--font-display); font-size: 1.6rem; font-weight: 700;
  text-align: center; margin-bottom: 6px;
}
.auth-sub   { text-align: center; color: var(--text-secondary); font-size: 1rem; font-weight: 500; margin-bottom: 32px; }
.auth-tabs  { display: flex; border-bottom: 1px solid var(--border-color); margin-bottom: 28px; background: rgba(255,255,255,0.02); }
.auth-tab {
  flex: 1; padding: 14px; text-align: center;
  font-size: 0.95rem; font-weight: 600; color: var(--text-muted);
  cursor: pointer; border: none; background: none; border-bottom: 2px solid transparent;
  transition: all var(--transition-base);
}
.auth-tab:hover { color: var(--text-primary); background: rgba(255,255,255,0.04); }
.auth-tab.active { color: var(--accent-1); border-bottom-color: var(--accent-1); background: rgba(99,102,241,0.06); }
.auth-form { display: flex; flex-direction: column; gap: 16px; }
.auth-divider {
  text-align: center; font-size: 0.82rem; color: var(--text-muted);
  position: relative; margin: 8px 0;
}
.auth-divider::before, .auth-divider::after {
  content: ''; position: absolute; top: 50%;
  width: 40%; height: 1px; background: var(--border-color);
}
.auth-divider::before { left: 0; }
.auth-divider::after  { right: 0; }

/* ── QR Components ───────────────────────────────────────────────────────────── */
.qr-wrapper {
  display: flex; flex-direction: column; align-items: center; gap: 20px;
}
.qr-box {
  position: relative;
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 20px;
  box-shadow: var(--shadow-lg), 0 0 0 4px rgba(99,102,241,0.2);
  transition: all var(--transition-base);
}
.qr-box.refreshing { opacity: 0.4; transform: scale(0.97); }

.qr-refresh-ring {
  position: absolute; inset: -10px;
  border-radius: var(--radius-xl);
  border: 3px solid transparent;
  border-top-color: var(--accent-1);
  animation: spin 1s linear infinite;
  display: none;
}
.qr-box.refreshing .qr-refresh-ring { display: block; }

.qr-timer-bar {
  width: 100%; height: 6px;
  background: var(--border-color);
  border-radius: var(--radius-full);
  overflow: hidden;
}
.qr-timer-fill {
  height: 100%; border-radius: var(--radius-full);
  background: var(--gradient-brand);
  transition: width 1s linear;
}
.qr-timer-text {
  font-family: var(--font-display); font-size: 1.1rem; font-weight: 700;
  color: var(--text-secondary);
}
.qr-timer-text span { color: var(--accent-1); font-size: 1.5rem; }

.live-counter {
  display: flex; gap: 16px; flex-wrap: wrap; justify-content: center;
}
.counter-pill {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  padding: 8px 20px;
  display: flex; align-items: center; gap: 8px;
  font-weight: 600; font-size: 0.92rem;
}
.counter-dot { width: 8px; height: 8px; border-radius: 50%; }
.counter-dot.green { background: var(--accent-success); animation: pulse 1.5s infinite; }
.counter-dot.blue  { background: var(--accent-1); }

/* ── Scanner ─────────────────────────────────────────────────────────────────── */
.scanner-container {
  display: flex; flex-direction: column; align-items: center; gap: 24px;
}
#qr-reader {
  width: 100%; max-width: 360px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}
.scan-result {
  width: 100%; max-width: 360px;
  padding: 20px; border-radius: var(--radius-lg);
  text-align: center; display: none;
}
.scan-result.success {
  background: rgba(16,185,129,0.12);
  border: 1.5px solid rgba(16,185,129,0.4);
  display: block;
}
.scan-result.error {
  background: rgba(239,68,68,0.12);
  border: 1.5px solid rgba(239,68,68,0.4);
  display: block;
}
.scan-result-icon { font-size: 3rem; margin-bottom: 8px; animation: bounceIn 0.5s; }
@keyframes bounceIn {
  0%   { transform: scale(0); }
  60%  { transform: scale(1.2); }
  100% { transform: scale(1); }
}

/* ── Attendance Table ────────────────────────────────────────────────────────── */
.table-wrapper {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  backdrop-filter: blur(16px);
}
.sc-table {
  width: 100%; border-collapse: collapse;
  font-size: 0.9rem;
}
.sc-table thead { background: rgba(99,102,241,0.08); }
.sc-table th {
  padding: 14px 16px;
  text-align: left;
  font-size: 0.78rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.06em;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border-color);
}
.sc-table td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-primary);
}
.sc-table tbody tr:last-child td { border-bottom: none; }
.sc-table tbody tr { transition: background var(--transition-fast); }
.sc-table tbody tr:hover { background: var(--bg-card-hover); }

/* ── Charts ──────────────────────────────────────────────────────────────────── */
.chart-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  backdrop-filter: blur(16px);
}
.chart-title { font-family: var(--font-display); font-size: 1rem; font-weight: 600; margin-bottom: 20px; }

/* ── AI Insights ─────────────────────────────────────────────────────────────── */
.ai-panel {
  background: linear-gradient(135deg, rgba(99,102,241,0.08) 0%, rgba(139,92,246,0.05) 100%);
  border: 1px solid rgba(99,102,241,0.25);
  border-radius: var(--radius-lg);
  padding: 28px;
  backdrop-filter: blur(16px);
}
.ai-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 20px; flex-wrap: wrap; gap: 12px;
}
.ai-badge {
  display: inline-flex; align-items: center; gap: 6px;
  background: rgba(99,102,241,0.15);
  border: 1px solid rgba(99,102,241,0.3);
  border-radius: var(--radius-full);
  padding: 5px 14px; font-size: 0.78rem; font-weight: 700;
  color: var(--accent-1); text-transform: uppercase; letter-spacing: 0.06em;
}
.ai-content {
  font-size: 0.92rem; line-height: 1.75;
  color: var(--text-secondary); white-space: pre-wrap;
  min-height: 80px;
}
.ai-content.empty { color: var(--text-muted); font-style: italic; }
.ai-typing::after {
  content: '▊'; animation: blink 0.7s step-start infinite;
}
@keyframes blink { 50% { opacity: 0; } }

/* ── Progress Bar ────────────────────────────────────────────────────────────── */
.progress-bar {
  width: 100%; height: 10px; background: var(--border-color);
  border-radius: var(--radius-full); overflow: hidden;
}
.progress-fill {
  height: 100%; border-radius: var(--radius-full);
  background: var(--gradient-brand);
  transition: width 1s cubic-bezier(0.16, 1, 0.3, 1);
}
.progress-fill.warning { background: var(--gradient-warning); }
.progress-fill.danger  { background: var(--gradient-danger); }

/* ── Session Control Panel ───────────────────────────────────────────────────── */
.session-panel {
  display: flex; flex-direction: column; gap: 24px;
  align-items: flex-start;
}
.session-info {
  display: flex; flex-direction: column; gap: 8px;
}
.session-meta {
  font-size: 0.85rem; color: var(--text-muted);
  display: flex; align-items: center; gap: 8px;
}
.session-id-chip {
  font-family: monospace; font-size: 0.78rem;
  background: rgba(99,102,241,0.1);
  border: 1px solid rgba(99,102,241,0.2);
  padding: 3px 10px; border-radius: var(--radius-full);
  color: var(--accent-1);
}

/* ── Student History ─────────────────────────────────────────────────────────── */
.history-item {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border-color);
}
.history-item:last-child { border-bottom: none; }
.history-date { font-weight: 600; font-size: 0.9rem; }
.history-course { font-size: 0.82rem; color: var(--text-muted); margin-top: 2px; }

/* ── Warning Banner ──────────────────────────────────────────────────────────── */
.warning-banner {
  background: rgba(239,68,68,0.1);
  border: 1.5px solid rgba(239,68,68,0.3);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  display: flex; align-items: center; gap: 12px;
  font-size: 0.9rem; font-weight: 500;
}
.warning-banner .icon { font-size: 1.5rem; }

/* ── Pulse animation ─────────────────────────────────────────────────────────── */
@keyframes pulse {
  0%, 100% { opacity: 1; box-shadow: 0 0 0 0 rgba(16,185,129,0.4); }
  50%       { opacity: 0.7; box-shadow: 0 0 0 6px rgba(16,185,129,0); }
}

/* ── Divider ─────────────────────────────────────────────────────────────────── */
.divider { height: 1px; background: var(--border-color); margin: 24px 0; }

/* ── Footer ──────────────────────────────────────────────────────────────────── */
footer {
  text-align: center; padding: 20px 24px;
  border-top: 1px solid var(--border-color);
  font-size: 0.82rem; color: var(--text-muted);
}

/* ── Skip to content ─────────────────────────────────────────────────────────── */
.skip-link {
  position: absolute; top: -100px; left: 12px;
  background: var(--accent-1); color: #fff;
  padding: 8px 16px; border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  z-index: 999;
}
.skip-link:focus { top: 0; }

/* ── Responsive ──────────────────────────────────────────────────────────────── */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .content-area    { padding: 20px 16px; }
  .navbar          { padding: 0 16px; }
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  .grid-4          { grid-template-columns: repeat(2, 1fr); }
  .hero-title      { font-size: 2.2rem; }
  .auth-card       { padding: 28px 20px; }
  .features-grid   { grid-template-columns: 1fr; }
  .ai-header       { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 480px) {
  .grid-4 { grid-template-columns: 1fr; }
  .hero-cta { flex-direction: column; align-items: stretch; }
  .hero-cta .btn { justify-content: center; }
  .stat-value  { font-size: 1.8rem; }
}

/* ─── Matrix Table (Sticky Headers) ────────────────────────────────────────── */
.matrix-table {
  border-collapse: separate;
  border-spacing: 0;
}
.matrix-table th, .matrix-table td {
  border: 1px solid var(--border-color);
  padding: 12px;
  white-space: nowrap;
}
.matrix-table th {
  background: rgba(99,102,241,0.05);
  position: sticky;
  top: 0;
  z-index: 10;
}
.matrix-table td:first-child, .matrix-table th:first-child {
  position: sticky;
  left: 0;
  background: var(--bg-card);
  z-index: 11;
  min-width: 180px;
  border-right: 2px solid var(--border-color);
}
.matrix-table th:first-child { 
  z-index: 12; 
  background: rgba(99,102,241,0.1);
}
.matrix-table tr:hover td {
  background: var(--bg-card-hover);
}