/* ================================================
   Base & Variables
   ================================================ */
:root {
  --primary: #1a3a6b;
  --primary-light: #2d5da6;
  --accent: #f4a61d;
  --accent2: #e8630a;
  --bg-dark: #0d1b35;
  --bg-mid: #132040;
  --bg-light: #f0f4ff;
  --card-bg: #ffffff;
  --text-main: #1a1a2e;
  --text-muted: #5a6a85;
  --text-light: #ffffff;
  --border: #d0dff0;
  --shadow: 0 8px 32px rgba(26, 58, 107, 0.13);
  --shadow-lg: 0 20px 60px rgba(26, 58, 107, 0.2);
  --radius: 16px;
  --radius-sm: 8px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font: 'Tajawal', sans-serif;
  --font-code: 'Fira Code', monospace;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg-light);
  color: var(--text-main);
  line-height: 1.7;
  direction: rtl;
}

a { color: inherit; text-decoration: none; }

img { max-width: 100%; }

/* ================================================
   Layout
   ================================================ */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

.section { padding: 96px 0; }

.section-header {
  text-align: center;
  margin-bottom: 56px;
}

.section-tag {
  display: inline-block;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 1px;
  padding: 6px 18px;
  border-radius: 50px;
  margin-bottom: 14px;
}

.section-header h2 {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 10px;
}

.section-header p {
  color: var(--text-muted);
  font-size: 1.1rem;
}

/* ================================================
   Navbar
   ================================================ */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 40px;
  background: rgba(13, 27, 53, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255,255,255,0.08);
  transition: var(--transition);
}

.navbar.scrolled { padding: 12px 40px; }

.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #fff;
  font-weight: 700;
  font-size: 1rem;
}

.nav-code {
  font-family: var(--font-code);
  background: var(--accent);
  color: var(--primary);
  padding: 3px 10px;
  border-radius: 6px;
  font-weight: 700;
  font-size: 0.9rem;
}

.nav-links {
  display: flex;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  color: rgba(255,255,255,0.8);
  font-size: 0.95rem;
  font-weight: 500;
  transition: color var(--transition);
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  right: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width var(--transition);
}

.nav-links a:hover { color: var(--accent); }
.nav-links a:hover::after { width: 100%; }

/* ================================================
   Hero
   ================================================ */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  background: linear-gradient(145deg, #0a1628 0%, #0d1b35 40%, #132040 70%, #1a2d55 100%);
  text-align: center;
}

.hero-bg-canvas {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
}

/* Animated floating code/math symbols */
.hero-bg-canvas::before {
  content: 'f(n)  ∀x  Σ  O(n)  ∈  ∩  →  λ  π  ∂  ∞  ≡  ⊆  ∫  ∇  ∅  α  β';
  position: absolute;
  top: -20%;
  left: -10%;
  width: 120%;
  height: 140%;
  font-family: var(--font-code);
  font-size: 1.4rem;
  color: rgba(255,255,255,0.04);
  word-spacing: 60px;
  line-height: 5rem;
  letter-spacing: 40px;
  transform: rotate(-15deg);
  white-space: pre-wrap;
  pointer-events: none;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 60% 40%, rgba(45,93,166,0.3) 0%, transparent 60%),
              radial-gradient(ellipse at 10% 80%, rgba(244,166,29,0.1) 0%, transparent 50%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 2;
  padding: 120px 24px 60px;
}

.hero-badge {
  display: inline-block;
  border: 1px solid rgba(244,166,29,0.4);
  color: var(--accent);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 7px 22px;
  border-radius: 50px;
  margin-bottom: 28px;
  letter-spacing: 0.5px;
  background: rgba(244,166,29,0.08);
}

.hero-title {
  font-size: clamp(2.4rem, 7vw, 4.5rem);
  font-weight: 900;
  color: #fff;
  line-height: 1.2;
  margin-bottom: 18px;
}

.gradient-text {
  background: linear-gradient(90deg, var(--accent), #f87b3e, #ff6b6b);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: clamp(1.1rem, 2.5vw, 1.5rem);
  color: rgba(255,255,255,0.75);
  margin-bottom: 32px;
  font-weight: 400;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
  margin-bottom: 44px;
}

.hero-meta span {
  color: rgba(255,255,255,0.65);
  font-size: 0.95rem;
  background: rgba(255,255,255,0.06);
  padding: 6px 18px;
  border-radius: 50px;
  border: 1px solid rgba(255,255,255,0.1);
}

.hero-cta {
  font-size: 1.1rem;
  padding: 16px 44px;
}

.scroll-indicator {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  width: 24px;
  height: 40px;
  border: 2px solid rgba(255,255,255,0.3);
  border-radius: 12px;
  display: flex;
  justify-content: center;
  padding-top: 6px;
}

.scroll-dot {
  width: 4px;
  height: 8px;
  background: rgba(255,255,255,0.6);
  border-radius: 2px;
  animation: scrollBounce 2s infinite;
}

@keyframes scrollBounce {
  0%, 100% { transform: translateY(0); opacity: 1; }
  50% { transform: translateY(10px); opacity: 0.3; }
}

/* ================================================
   Buttons
   ================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 50px;
  font-family: var(--font);
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  border: none;
  transition: all var(--transition);
  text-decoration: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: var(--primary);
  box-shadow: 0 4px 20px rgba(244,166,29,0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(244,166,29,0.5);
}

.btn-full { width: 100%; justify-content: center; }

/* ================================================
   About Section
   ================================================ */
.about-section { background: #fff; }

.about-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 24px;
  margin-bottom: 48px;
}

.about-card {
  background: var(--bg-light);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  text-align: center;
  transition: var(--transition);
}

.about-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
  border-color: var(--primary-light);
}

.about-icon { font-size: 2.2rem; margin-bottom: 14px; }

.about-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 10px;
}

.about-card p {
  font-size: 0.92rem;
  color: var(--text-muted);
}

.speaker-card {
  display: flex;
  gap: 32px;
  align-items: flex-start;
  background: linear-gradient(135deg, var(--primary) 0%, var(--bg-dark) 100%);
  border-radius: var(--radius);
  padding: 40px;
  color: #fff;
  box-shadow: var(--shadow-lg);
}

.speaker-avatar {
  width: 90px;
  height: 90px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  font-weight: 900;
  color: var(--primary);
  flex-shrink: 0;
  box-shadow: 0 0 0 4px rgba(244,166,29,0.3);
}

.speaker-info h3 {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--accent);
  margin-bottom: 6px;
}

.speaker-title {
  font-size: 1rem;
  color: rgba(255,255,255,0.75);
  margin-bottom: 10px;
}

.speaker-info p {
  font-size: 0.9rem;
  color: rgba(255,255,255,0.7);
  margin-bottom: 4px;
}

.speaker-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}

.speaker-tags span {
  font-family: var(--font-code);
  font-size: 0.78rem;
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.2);
  color: rgba(255,255,255,0.9);
  padding: 4px 12px;
  border-radius: 4px;
}

/* ================================================
   Topics Section
   ================================================ */
.topics-section { background: var(--bg-light); }

.topics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(460px, 1fr));
  gap: 28px;
}

.topic-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  display: flex;
  gap: 20px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.topic-card::before {
  content: '';
  position: absolute;
  top: 0; right: 0;
  width: 4px;
  height: 100%;
  background: linear-gradient(180deg, var(--primary), var(--primary-light));
  opacity: 0;
  transition: opacity var(--transition);
}

.topic-card:hover { box-shadow: var(--shadow); transform: translateY(-3px); }
.topic-card:hover::before { opacity: 1; }

.highlight-card {
  background: linear-gradient(135deg, #0d1b35 0%, #1a2d55 100%);
  color: #fff;
  border-color: transparent;
}

.highlight-card::before {
  background: linear-gradient(180deg, var(--accent), var(--accent2)) !important;
  opacity: 1 !important;
}

.topic-number {
  font-family: var(--font-code);
  font-size: 2.4rem;
  font-weight: 700;
  color: rgba(26,58,107,0.15);
  line-height: 1;
  flex-shrink: 0;
  min-width: 52px;
  text-align: center;
}

.highlight-card .topic-number { color: rgba(255,255,255,0.15); }

.topic-body h3 {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 16px;
}

.highlight-card .topic-body h3 { color: var(--accent); }

.tech-group { margin-bottom: 14px; }

.tech-label {
  display: block;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 6px;
}

.highlight-card .tech-label { color: rgba(255,255,255,0.5); }

.tech-chips { display: flex; flex-wrap: wrap; gap: 7px; }

.tech-chips span {
  font-family: var(--font-code);
  font-size: 0.78rem;
  background: var(--bg-light);
  border: 1px solid var(--border);
  color: var(--primary);
  padding: 4px 12px;
  border-radius: 4px;
  transition: var(--transition);
}

.tech-chips.large span { font-size: 0.85rem; padding: 6px 14px; }

.tech-chips span:hover {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

.highlight-card .tech-chips span {
  background: rgba(255,255,255,0.08);
  border-color: rgba(255,255,255,0.15);
  color: rgba(255,255,255,0.85);
}

.highlight-card .tech-chips span:hover {
  background: var(--accent);
  color: var(--primary);
  border-color: var(--accent);
}

/* Math concepts */
.math-concepts {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 12px;
}

.math-item {
  background: rgba(255,255,255,0.07);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  text-align: center;
}

.math-formula {
  display: block;
  font-family: var(--font-code);
  font-size: 1rem;
  color: var(--accent);
  margin-bottom: 6px;
}

.math-desc {
  font-size: 0.78rem;
  color: rgba(255,255,255,0.65);
}

/* Careers */
.careers-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 16px;
}

.career-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.career-cat {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 4px;
}

.career-group span:not(.career-cat) {
  font-size: 0.85rem;
  color: var(--text-muted);
  padding: 3px 0;
  border-bottom: 1px dashed var(--border);
}

/* ================================================
   Download Section
   ================================================ */
.download-section {
  background: linear-gradient(135deg, var(--bg-dark) 0%, var(--primary) 100%);
  position: relative;
  overflow: hidden;
}

.download-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle at 20% 50%, rgba(244,166,29,0.07) 0%, transparent 50%),
                    radial-gradient(circle at 80% 20%, rgba(45,93,166,0.15) 0%, transparent 40%);
  pointer-events: none;
}

.download-section .section-header h2 { color: #fff; }
.download-section .section-header p { color: rgba(255,255,255,0.65); }

.download-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 28px;
  position: relative;
  z-index: 1;
}

.download-card {
  background: rgba(255,255,255,0.07);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: var(--radius);
  padding: 36px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 16px;
  transition: var(--transition);
}

.download-card:hover {
  background: rgba(255,255,255,0.12);
  transform: translateY(-4px);
  box-shadow: 0 16px 48px rgba(0,0,0,0.3);
}

.dl-icon { color: var(--accent); }

.dl-info h3 {
  font-size: 1.3rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 8px;
}

.dl-info p {
  font-size: 0.9rem;
  color: rgba(255,255,255,0.6);
  margin-bottom: 10px;
}

.dl-badge {
  display: inline-block;
  font-family: var(--font-code);
  font-size: 0.8rem;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 4px;
  background: rgba(231,76,60,0.2);
  border: 1px solid rgba(231,76,60,0.4);
  color: #e74c3c;
}

.dl-badge.pptx {
  background: rgba(230,126,34,0.2);
  border-color: rgba(230,126,34,0.4);
  color: #e67e22;
}

.btn-download {
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: var(--primary);
  font-family: var(--font);
  font-size: 1rem;
  font-weight: 700;
  padding: 13px 30px;
  border-radius: 50px;
  border: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: var(--transition);
  box-shadow: 0 4px 16px rgba(244,166,29,0.3);
}

.btn-download:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(244,166,29,0.45);
}

.btn-download.pptx-btn {
  background: linear-gradient(135deg, #e67e22, #d35400);
  box-shadow: 0 4px 16px rgba(230,126,34,0.3);
}

.toast {
  position: fixed;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: #fff;
  color: var(--primary);
  border-radius: var(--radius-sm);
  padding: 14px 28px;
  font-size: 0.95rem;
  font-weight: 600;
  box-shadow: var(--shadow-lg);
  z-index: 999;
  opacity: 0;
  transition: all 0.4s ease;
  border-right: 4px solid var(--primary);
  max-width: 90vw;
  text-align: center;
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.toast.error { border-right-color: #e74c3c; }
.toast.hidden { display: none; }

/* ================================================
   Feedback Section
   ================================================ */
.feedback-section { background: #fff; }

.rating-stats {
  display: flex;
  gap: 32px;
  justify-content: center;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

.stat-box {
  background: var(--bg-light);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 48px;
  text-align: center;
  min-width: 160px;
}

.stat-number {
  display: block;
  font-size: 3rem;
  font-weight: 900;
  color: var(--primary);
  line-height: 1;
  margin-bottom: 8px;
}

.stat-stars { font-size: 1.4rem; color: var(--accent); margin-bottom: 8px; }
.stat-label { font-size: 0.85rem; color: var(--text-muted); font-weight: 600; }

.feedback-form-wrap {
  max-width: 640px;
  margin: 0 auto 56px;
  background: var(--bg-light);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 40px;
}

.feedback-form {
  display: flex;
  flex-direction: column;
  gap: 22px;
}

.form-group { display: flex; flex-direction: column; gap: 8px; }

.form-group label {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--primary);
}

.required { color: #e74c3c; }

.form-group input,
.form-group textarea {
  font-family: var(--font);
  font-size: 0.95rem;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  background: #fff;
  color: var(--text-main);
  outline: none;
  transition: border-color var(--transition);
  direction: rtl;
  resize: vertical;
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--primary-light);
  box-shadow: 0 0 0 3px rgba(45,93,166,0.1);
}

/* Star Rating */
.star-rating {
  display: flex;
  gap: 8px;
  flex-direction: row-reverse;
  justify-content: flex-end;
}

.star-rating button {
  font-size: 2rem;
  background: none;
  border: none;
  cursor: pointer;
  color: #d0dff0;
  transition: color var(--transition), transform var(--transition);
  line-height: 1;
  padding: 0;
}

.star-rating button:hover,
.star-rating button.active {
  color: var(--accent);
}

.star-rating button:hover { transform: scale(1.2); }

.rating-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-style: italic;
}

/* Feedbacks List */
.feedbacks-title {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 28px;
  text-align: center;
}

.no-feedback {
  text-align: center;
  color: var(--text-muted);
  font-style: italic;
  padding: 32px;
}

.feedback-item {
  background: var(--bg-light);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 28px;
  margin-bottom: 16px;
  transition: var(--transition);
}

.feedback-item:hover { box-shadow: var(--shadow); }

.feedback-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
  flex-wrap: wrap;
  gap: 8px;
}

.feedback-author {
  font-weight: 700;
  color: var(--primary);
  font-size: 0.95rem;
}

.feedback-stars { font-size: 1.1rem; color: var(--accent); }

.feedback-date {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.feedback-text {
  font-size: 0.92rem;
  color: var(--text-main);
  margin-bottom: 10px;
  line-height: 1.65;
}

.feedback-suggestion {
  font-size: 0.88rem;
  color: var(--text-muted);
  background: #fff;
  border-right: 3px solid var(--accent);
  padding: 8px 14px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-style: italic;
}

.feedback-suggestion::before {
  content: '💡 مقترح: ';
  font-style: normal;
  font-weight: 700;
  color: var(--accent2);
}

/* ================================================
   Footer
   ================================================ */
.footer {
  background: var(--bg-dark);
  color: rgba(255,255,255,0.65);
  padding: 40px 0;
  text-align: center;
}

.footer-inner { display: flex; flex-direction: column; align-items: center; gap: 8px; }

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.1rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 4px;
}

.footer p { font-size: 0.88rem; }
.footer-copy { font-size: 0.78rem; opacity: 0.5; margin-top: 6px; }

/* ================================================
   Form Success & Hidden
   ================================================ */
.hidden { display: none !important; }

.form-success {
  text-align: center;
  padding: 48px 24px;
}

.success-icon { font-size: 3.5rem; margin-bottom: 16px; }

.form-success h3 {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 10px;
}

.form-success p {
  color: var(--text-muted);
  font-size: 1rem;
}

/* ================================================
   Animations
   ================================================ */
[data-aos] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

[data-aos].aos-animate {
  opacity: 1;
  transform: translateY(0);
}

/* ================================================
   Responsive
   ================================================ */
@media (max-width: 768px) {
  .navbar { padding: 14px 20px; }
  .nav-links { display: none; }
  .section { padding: 64px 0; }

  .topics-grid { grid-template-columns: 1fr; }
  .topic-card { flex-direction: column; }

  .speaker-card { flex-direction: column; text-align: center; }
  .speaker-avatar { align-self: center; }

  .download-cards { grid-template-columns: 1fr; }
  .math-concepts { grid-template-columns: repeat(2, 1fr); }
  .careers-grid { grid-template-columns: 1fr; }

  .feedback-form-wrap { padding: 24px; }
  .stat-box { padding: 20px 32px; }
}

@media (max-width: 480px) {
  .hero-meta { flex-direction: column; align-items: center; }
  .hero-title { font-size: 2rem; }
  .math-concepts { grid-template-columns: 1fr; }
}