/* ==========================================================================
   NAIS AIS2 Liquid Glass Design System
   VisionOS / Dark Glassmorphism, Specular Borders, Neon Atmospheric Accents
   ========================================================================== */

:root {
  --bg-dark: #050816;
  --bg-card: rgba(13, 18, 44, 0.62);
  --bg-card-hover: rgba(20, 28, 64, 0.72);
  --bg-card-solid: #0d122e;
  --bg-elevated: rgba(25, 33, 72, 0.75);

  --glass-blur: 24px;
  --glass-saturate: 180%;
  
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-specular: rgba(255, 255, 255, 0.18);
  --border-glow: rgba(99, 102, 241, 0.45);

  --primary: #6366f1;
  --primary-hover: #4f46e5;
  --primary-glow: rgba(99, 102, 241, 0.35);
  
  --secondary: #8b5cf6;
  --accent-cyan: #38bdf8;
  --accent-emerald: #10b981;
  --accent-amber: #f59e0b;
  --accent-rose: #f43f5e;

  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;

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

  --shadow-glass: 0 16px 40px -10px rgba(0, 0, 0, 0.5), inset 0 1px 1px rgba(255, 255, 255, 0.14);
  --shadow-glow: 0 0 35px rgba(99, 102, 241, 0.25);
  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.25);

  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

/* Glass Card Base */
.glass-card {
  background: var(--bg-card);
  backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturate));
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturate));
  border: 1px solid var(--border-subtle);
  border-top: 1px solid var(--border-specular);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-glass);
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
  overflow: hidden;
}

.glass-card:hover {
  background: var(--bg-card-hover);
  border-color: rgba(255, 255, 255, 0.15);
  transform: translateY(-2px);
  box-shadow: 0 20px 45px -8px rgba(0, 0, 0, 0.6), inset 0 1px 1px rgba(255, 255, 255, 0.2);
}

.glass-panel {
  background: rgba(10, 14, 36, 0.55);
  backdrop-filter: blur(28px) saturate(190%);
  -webkit-backdrop-filter: blur(28px) saturate(190%);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-glass);
}

/* Interactive Glass Buttons */
.btn-glass {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 18px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.07);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-top: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: var(--radius-md);
  cursor: pointer;
  text-decoration: none;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.2);
}

.btn-glass:hover {
  background: rgba(255, 255, 255, 0.14);
  border-color: rgba(255, 255, 255, 0.24);
  transform: translateY(-1px);
}

.btn-glass:active {
  transform: translateY(1px);
}

.btn-primary {
  background: linear-gradient(135deg, #6366f1 0%, #4f46e5 100%);
  border-color: rgba(255, 255, 255, 0.25);
  box-shadow: 0 6px 20px rgba(99, 102, 241, 0.4), inset 0 1px 1px rgba(255, 255, 255, 0.3);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #7174f8 0%, #584ff1 100%);
  box-shadow: 0 8px 25px rgba(99, 102, 241, 0.55);
}

.btn-sm {
  padding: 6px 12px;
  font-size: 0.8rem;
  border-radius: var(--radius-sm);
}

/* Glass Inputs */
.glass-input {
  width: 100%;
  padding: 12px 16px;
  background: rgba(7, 10, 24, 0.6);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  color: var(--text-main);
  font-size: 0.95rem;
  font-family: inherit;
  outline: none;
  transition: all 0.2s ease;
}

.glass-input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.25);
  background: rgba(10, 14, 34, 0.8);
}

.glass-input::placeholder {
  color: var(--text-dim);
}

/* Badges & Tag Pills */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

/* Lecture / Seminar / Practice Badges */
.badge-p {
  background: rgba(139, 92, 246, 0.18);
  color: #c4b5fd;
  border: 1px solid rgba(139, 92, 246, 0.35);
}

.badge-c {
  background: rgba(16, 185, 129, 0.18);
  color: #6ee7b7;
  border: 1px solid rgba(16, 185, 129, 0.35);
}

.badge-s {
  background: rgba(245, 158, 11, 0.18);
  color: #fcd34d;
  border: 1px solid rgba(245, 158, 11, 0.35);
}

/* Grade Pills */
.grade-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-md);
  font-weight: 800;
  font-size: 1rem;
}

.grade-A { background: rgba(16, 185, 129, 0.22); color: #34d399; border: 1px solid rgba(16, 185, 129, 0.4); }
.grade-B { background: rgba(14, 165, 233, 0.22); color: #38bdf8; border: 1px solid rgba(14, 165, 233, 0.4); }
.grade-C { background: rgba(139, 92, 246, 0.22); color: #a78bfa; border: 1px solid rgba(139, 92, 246, 0.4); }
.grade-D { background: rgba(245, 158, 11, 0.22); color: #fbbf24; border: 1px solid rgba(245, 158, 11, 0.4); }
.grade-E { background: rgba(249, 115, 22, 0.22); color: #fb923c; border: 1px solid rgba(249, 115, 22, 0.4); }
.grade-FX { background: rgba(239, 68, 68, 0.22); color: #f87171; border: 1px solid rgba(239, 68, 68, 0.4); }
.grade-Zap { background: rgba(99, 102, 241, 0.22); color: #818cf8; border: 1px solid rgba(99, 102, 241, 0.4); font-size: 0.8rem; }
.grade-none { background: rgba(255, 255, 255, 0.08); color: var(--text-dim); border: 1px solid rgba(255, 255, 255, 0.1); font-size: 0.85rem; }

/* Custom Scrollbars */
::-webkit-scrollbar {
  width: 7px;
  height: 7px;
}

::-webkit-scrollbar-track {
  background: rgba(5, 8, 22, 0.5);
}

::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.16);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.28);
}