/* =========================================
   CSS Custom Properties
   ========================================= */
:root {
  --bg-primary:    #060612;
  --bg-secondary:  #0c0c1e;
  --bg-card:       #0f1128;
  --bg-card-hover: #141635;

  --text-primary:   #f0f0ff;
  --text-secondary: #a0a0c8;
  --text-muted:     #6060a0;

  --accent-blue:   #4f9cf9;
  --accent-purple: #8b5cf6;
  --accent-cyan:   #22d3ee;

  --gradient-main: linear-gradient(135deg, #4f9cf9 0%, #8b5cf6 100%);
  --gradient-text: linear-gradient(135deg, #4f9cf9 0%, #a78bfa 50%, #f472b6 100%);

  --border:       rgba(79, 156, 249, 0.15);
  --border-hover: rgba(79, 156, 249, 0.40);

  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;

  --shadow-glow: 0 0 40px rgba(79, 156, 249, 0.15);
  --transition:  all 0.3s ease;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
ul { list-style: none; }

/* =========================================
   Utilities
   ========================================= */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.gradient-text {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-header {
  text-align: center;
  margin-bottom: 64px;
}

.section-tag {
  display: inline-block;
  padding: 6px 16px;
  background: rgba(79, 156, 249, 0.10);
  border: 1px solid rgba(79, 156, 249, 0.30);
  border-radius: 100px;
  font-size: 12px;
  font-weight: 700;
  color: var(--accent-blue);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 16px;
}

.section-header h2 {
  font-size: clamp(28px, 5vw, 44px);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 16px;
}

.section-header p {
  font-size: 18px;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.7;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 28px;
  border-radius: 12px;
  font-size: 15px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
}

.btn-primary {
  background: var(--gradient-main);
  color: #fff;
  box-shadow: 0 4px 20px rgba(79, 156, 249, 0.30);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(79, 156, 249, 0.45);
}

.btn-secondary {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border);
}
.btn-secondary:hover {
  border-color: var(--border-hover);
  background: rgba(79, 156, 249, 0.05);
  transform: translateY(-2px);
}

/* Reveal animation */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* =========================================
   Navbar
   ========================================= */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  padding: 16px 0;
  transition: var(--transition);
}
.navbar.scrolled {
  background: rgba(6, 6, 18, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -0.02em;
}
.logo-icon { font-size: 24px; }
.logo-text {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
}
.nav-links li a {
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: var(--transition);
}
.nav-links li a:hover { color: var(--text-primary); background: rgba(255,255,255,0.05); }

.nav-links .nav-cta {
  background: var(--gradient-main);
  color: #fff !important;
  padding: 8px 20px;
}
.nav-links .nav-cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(79, 156, 249, 0.35);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.nav-toggle span {
  display: block;
  width: 24px; height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition);
}

/* =========================================
   Hero
   ========================================= */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  overflow: hidden;
  padding: 120px 24px 80px;
}

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

.grid-overlay {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(79,156,249,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(79,156,249,0.04) 1px, transparent 1px);
  background-size: 50px 50px;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 80%);
}

.gradient-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  animation: float 8s ease-in-out infinite;
}
.orb-1 {
  width: 500px; height: 500px;
  background: radial-gradient(circle, rgba(79,156,249,0.15), transparent);
  top: -100px; right: -100px;
}
.orb-2 {
  width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(139,92,246,0.12), transparent);
  bottom: 0; left: -100px;
  animation-delay: -3s;
}
.orb-3 {
  width: 300px; height: 300px;
  background: radial-gradient(circle, rgba(34,211,238,0.08), transparent);
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  animation-delay: -5s;
}

@keyframes float {
  0%, 100% { transform: translateY(0) scale(1); }
  50%       { transform: translateY(-20px) scale(1.05); }
}

.hero-content { position: relative; max-width: 900px; }

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 20px;
  background: rgba(79,156,249,0.08);
  border: 1px solid rgba(79,156,249,0.25);
  border-radius: 100px;
  font-size: 14px;
  font-weight: 500;
  color: var(--accent-blue);
  margin-bottom: 28px;
  animation: fadeInUp 0.6s ease both;
}

.hero-title {
  font-size: clamp(48px, 9vw, 88px);
  font-weight: 900;
  letter-spacing: -0.04em;
  line-height: 1.05;
  margin-bottom: 24px;
  animation: fadeInUp 0.6s 0.1s ease both;
}

.hero-subtitle {
  font-size: clamp(16px, 2.5vw, 20px);
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 40px;
  animation: fadeInUp 0.6s 0.2s ease both;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  margin-bottom: 60px;
  animation: fadeInUp 0.6s 0.3s ease both;
  flex-wrap: wrap;
}

.hero-stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 40px;
  animation: fadeInUp 0.6s 0.4s ease both;
}

.stat { display: flex; flex-direction: column; align-items: center; gap: 4px; }

.stat-number {
  font-size: 36px;
  font-weight: 800;
  letter-spacing: -0.02em;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.stat-label { font-size: 13px; color: var(--text-muted); font-weight: 500; }
.stat-divider { width: 1px; height: 40px; background: var(--border); }

.scroll-indicator {
  position: absolute;
  bottom: 40px; left: 50%;
  transform: translateX(-50%);
  animation: bounce 2s infinite;
}
.scroll-arrow {
  width: 20px; height: 20px;
  border-right: 2px solid var(--text-muted);
  border-bottom: 2px solid var(--text-muted);
  transform: rotate(45deg);
}

@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50%       { transform: translateX(-50%) translateY(8px); }
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* =========================================
   About
   ========================================= */
.about { padding: 100px 0; background: var(--bg-secondary); }

.about-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.about-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 36px;
  transition: var(--transition);
}
.about-card:hover {
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}
.about-icon { font-size: 40px; margin-bottom: 20px; }
.about-card h3 { font-size: 22px; font-weight: 700; margin-bottom: 12px; letter-spacing: -0.02em; }
.about-card p  { color: var(--text-secondary); line-height: 1.7; }

/* =========================================
   Services
   ========================================= */
.services { padding: 100px 0; background: var(--bg-primary); }

.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 24px;
}

.service-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: var(--transition);
  position: relative;
}
.service-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}
.service-card.featured {
  border-color: rgba(79, 156, 249, 0.40);
  background: linear-gradient(135deg, rgba(79,156,249,0.08), rgba(139,92,246,0.08));
}

.featured-badge {
  position: absolute;
  top: 20px; right: 20px;
  background: var(--gradient-main);
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 100px;
  letter-spacing: 0.05em;
}

.service-icon { font-size: 36px; margin-bottom: 20px; }
.service-card h3 { font-size: 20px; font-weight: 700; margin-bottom: 12px; letter-spacing: -0.02em; }
.service-card > p { color: var(--text-secondary); line-height: 1.7; margin-bottom: 20px; font-size: 15px; }

.service-features { display: flex; flex-direction: column; gap: 8px; }
.service-features li {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-secondary);
  font-weight: 500;
}
.service-features li::before { content: '✓'; color: var(--accent-blue); font-weight: 700; }

/* =========================================
   Learning
   ========================================= */
.learning { padding: 100px 0; background: var(--bg-secondary); }

.learning-path {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 40px;
  margin-bottom: 48px;
}
.learning-path h3 { font-size: 20px; font-weight: 700; margin-bottom: 32px; letter-spacing: -0.02em; }

.path-steps {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  flex-wrap: wrap;
}

.path-step {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  flex: 1;
  min-width: 190px;
}
.step-num {
  font-size: 32px;
  font-weight: 900;
  letter-spacing: -0.04em;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  flex-shrink: 0;
}
.step-content h4 { font-size: 15px; font-weight: 700; margin-bottom: 6px; }
.step-content p  { font-size: 13px; color: var(--text-secondary); line-height: 1.5; }

.path-arrow { color: var(--accent-blue); font-size: 22px; flex-shrink: 0; padding-top: 6px; }

.resources-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
  gap: 24px;
}

.resource-category {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: var(--transition);
}
.resource-category:hover {
  border-color: var(--border-hover);
  transform: translateY(-2px);
}
.category-icon { font-size: 32px; margin-bottom: 16px; }
.resource-category h3 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
  letter-spacing: -0.02em;
}

.resource-list { display: flex; flex-direction: column; gap: 20px; }
.resource-list li { display: flex; gap: 12px; align-items: flex-start; }

.resource-tag {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 6px;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  background: rgba(79,156,249,0.12);
  color: var(--accent-blue);
  border: 1px solid rgba(79,156,249,0.20);
  flex-shrink: 0;
  margin-top: 2px;
  white-space: nowrap;
}
.resource-tag.free    { background: rgba(34,197,94,0.12); color: #4ade80; border-color: rgba(34,197,94,0.25); }
.resource-tag.official{ background: rgba(251,191,36,0.12); color: #fbbf24; border-color: rgba(251,191,36,0.25); }

.resource-info strong { display: block; font-size: 14px; font-weight: 600; margin-bottom: 4px; }
.resource-info p      { font-size: 13px; color: var(--text-secondary); line-height: 1.5; }

/* =========================================
   Contact
   ========================================= */
.contact { padding: 100px 0; background: var(--bg-primary); }

.contact-card {
  background: linear-gradient(135deg, rgba(79,156,249,0.07), rgba(139,92,246,0.07));
  border: 1px solid rgba(79,156,249,0.25);
  border-radius: var(--radius-xl);
  padding: 64px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
  overflow: hidden;
}

.contact-content .section-tag { margin-bottom: 16px; }
.contact-content h2 {
  font-size: clamp(26px, 4vw, 42px);
  font-weight: 800;
  margin-bottom: 16px;
  letter-spacing: -0.03em;
}
.contact-content > p { color: var(--text-secondary); line-height: 1.7; margin-bottom: 28px; }

.contact-info { display: flex; flex-direction: column; gap: 12px; margin-bottom: 32px; }
.contact-item { display: flex; align-items: center; gap: 12px; color: var(--text-secondary); font-size: 15px; }
.contact-icon { font-size: 20px; }

.contact-visual { display: flex; flex-direction: column; align-items: center; text-align: center; }
.contact-orb {
  width: 180px; height: 180px;
  border-radius: 50%;
  background: var(--gradient-main);
  filter: blur(56px);
  opacity: 0.4;
  margin-bottom: 24px;
}
.contact-text {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.02em;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.4;
}

/* =========================================
   Footer
   ========================================= */
.footer {
  background: var(--bg-secondary);
  padding: 64px 0 32px;
  border-top: 1px solid var(--border);
}

.footer-content {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 64px;
  margin-bottom: 48px;
}

.footer-brand .nav-logo { margin-bottom: 12px; }
.footer-brand p { color: var(--text-muted); font-size: 14px; line-height: 1.6; }

.footer-links { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; }
.footer-col h4 {
  font-size: 12px;
  font-weight: 700;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.09em;
  margin-bottom: 16px;
}
.footer-col ul { display: flex; flex-direction: column; gap: 10px; }
.footer-col ul li a { font-size: 14px; color: var(--text-muted); transition: color 0.2s; }
.footer-col ul li a:hover { color: var(--text-primary); }

.footer-bottom {
  padding-top: 32px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--text-muted);
  font-size: 13px;
}

/* =========================================
   Responsive
   ========================================= */
@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: fixed;
    inset: 0;
    background: var(--bg-primary);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 24px;
    z-index: 999;
  }
  .nav-links.open { display: flex; }
  .nav-links li a { font-size: 20px; padding: 12px 24px; }
  .nav-toggle { display: flex; z-index: 1001; }

  .hero-stats { gap: 24px; }
  .stat-number { font-size: 28px; }

  .path-steps { flex-direction: column; }
  .path-arrow { transform: rotate(90deg); align-self: center; }

  .contact-card { grid-template-columns: 1fr; padding: 40px 28px; gap: 32px; }
  .contact-visual { display: none; }

  .footer-content { grid-template-columns: 1fr; gap: 40px; }
  .footer-links { grid-template-columns: repeat(2, 1fr); }
  .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }
}

@media (max-width: 480px) {
  .hero-actions { flex-direction: column; align-items: center; }
  .hero-stats { flex-direction: column; gap: 16px; }
  .stat-divider { width: 60px; height: 1px; }
  .services-grid { grid-template-columns: 1fr; }
  .learning-path { padding: 24px 20px; }
  .footer-links { grid-template-columns: 1fr; }
}