/**
 * نظام القوالب البصرية القابلة للتبديل المستوحى من ThreeUI (Stage 8 Student UI - ThreeUI 3D Depth & Presets)
 * يدعم 4 قوالب: three-dimensional | luxury-emerald | academic-royal | cyber-code
 * ويدعم الاتجاهين RTL (العربية) و LTR (الإنجليزية) عبر الخصائص المنطقية (CSS Logical Properties).
 */

:root,
[data-theme-preset="three-dimensional"] {
  --bg-base: #070b14;
  --bg-surface: rgba(17, 25, 45, 0.78);
  --bg-elevated: rgba(28, 39, 68, 0.88);
  --brand-primary: #6366f1;
  --brand-secondary: #06b6d4;
  --brand-accent: #f59e0b;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --border-specular: rgba(148, 163, 184, 0.22);
  --shadow-3d: 0 22px 48px -12px rgba(2, 6, 23, 0.85),
    inset 0 1px 0 0 rgba(255, 255, 255, 0.16);
  --glow-primary: radial-gradient(
    650px circle at 20% 10%,
    rgba(99, 102, 241, 0.22),
    transparent 65%
  );
  --radius-card: 18px;
}

[data-theme-preset="luxury-emerald"] {
  --bg-base: #041310;
  --bg-surface: rgba(9, 34, 29, 0.82);
  --bg-elevated: rgba(15, 52, 44, 0.9);
  --brand-primary: #10b981;
  --brand-secondary: #14b8a6;
  --brand-accent: #fbbf24;
  --text-primary: #ecfdf5;
  --text-secondary: #a7f3d0;
  --border-specular: rgba(52, 211, 153, 0.25);
}

[data-theme-preset="academic-royal"] {
  --bg-base: #0c0a1d;
  --bg-surface: rgba(24, 20, 52, 0.84);
  --bg-elevated: rgba(37, 31, 78, 0.92);
  --brand-primary: #8b5cf6;
  --brand-secondary: #ec4899;
  --brand-accent: #f97316;
  --text-primary: #f5f3ff;
  --text-secondary: #c4b5fd;
  --border-specular: rgba(167, 139, 250, 0.26);
}

[data-theme-preset="cyber-code"] {
  --bg-base: #05080f;
  --bg-surface: rgba(11, 19, 32, 0.86);
  --bg-elevated: rgba(18, 31, 51, 0.94);
  --brand-primary: #22d3ee;
  --brand-secondary: #38bdf8;
  --brand-accent: #a3e635;
  --text-primary: #ecfeff;
  --text-secondary: #7dd3fc;
  --border-specular: rgba(34, 211, 238, 0.28);
}

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

body {
  background-color: var(--bg-base);
  background-image: var(--glow-primary);
  color: var(--text-primary);
  font-family: "Cairo", "Inter", system-ui, -apple-system, sans-serif;
  min-height: 100vh;
  line-height: 1.65;
  overflow-x: hidden;
}

.student-shell {
  max-width: 1240px;
  margin-inline: auto;
  padding-inline: 1.25rem;
  padding-block: 1.5rem 4rem;
}

.three-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem 1.4rem;
  background: var(--bg-surface);
  backdrop-filter: blur(18px);
  border: 1px solid var(--border-specular);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-3d);
  margin-block-end: 2rem;
  flex-wrap: wrap;
}

.three-card {
  background: var(--bg-surface);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-specular);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-3d);
  padding: 1.5rem;
  transition: transform 0.24s cubic-bezier(0.22, 1, 0.36, 1),
    border-color 0.24s ease;
}

.three-card:hover {
  transform: translateY(-4px);
  border-color: var(--brand-primary);
}

.three-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(310px, 1fr));
  gap: 1.35rem;
}

.btn-3d {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.65rem 1.25rem;
  border-radius: 12px;
  font-weight: 700;
  font-family: inherit;
  cursor: pointer;
  border: 1px solid rgba(255, 255, 255, 0.18);
  background: linear-gradient(135deg, var(--brand-primary), var(--brand-secondary));
  color: #ffffff;
  box-shadow: 0 8px 20px -4px rgba(99, 102, 241, 0.45),
    inset 0 1px 0 rgba(255, 255, 255, 0.28);
  transition: transform 0.15s ease, opacity 0.15s ease;
}

.btn-3d:hover:not(:disabled) {
  transform: translateY(-2px);
}

.btn-3d:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.btn-secondary {
  background: var(--bg-elevated);
  color: var(--text-primary);
  box-shadow: none;
}

.badge-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 700;
  background: rgba(99, 102, 241, 0.18);
  color: var(--text-primary);
  border: 1px solid var(--border-specular);
}

.input-3d {
  width: 100%;
  padding: 0.75rem 1rem;
  border-radius: 12px;
  border: 1px solid var(--border-specular);
  background: rgba(7, 11, 20, 0.7);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.96rem;
}

.input-3d:focus {
  outline: none;
  border-color: var(--brand-primary);
}

/* حاوية مشغل الفيديو المحمي والعلامة المائية المتحركة */
.protected-player-stage {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  background: #000000;
  border-radius: var(--radius-card);
  overflow: hidden;
  border: 1px solid var(--border-specular);
  box-shadow: var(--shadow-3d);
  user-select: none;
}

.watermark-floating {
  position: absolute;
  pointer-events: none;
  z-index: 30;
  padding: 0.25rem 0.65rem;
  border-radius: 6px;
  background: rgba(0, 0, 0, 0.35);
  color: #ffffff;
  font-family: "JetBrains Mono", monospace;
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  transition: inset-block-start 1.2s ease, inset-inline-start 1.2s ease;
}

.code-snippet-box {
  direction: ltr;
  text-align: left;
  font-family: "JetBrains Mono", monospace;
  background: #050811;
  border: 1px solid var(--border-specular);
  border-radius: 12px;
  padding: 1rem;
  overflow-x: auto;
  margin-block: 0.75rem;
  font-size: 0.9rem;
}

.latex-math-inline {
  direction: ltr;
  display: inline-block;
  font-family: "Inter", serif;
  background: rgba(255, 255, 255, 0.06);
  padding: 0.1rem 0.45rem;
  border-radius: 6px;
  margin-inline: 0.2rem;
}