/* ===== LearnHub Landing Page Styles ===== */

/* --- Variables & Base --- */
:root {
  --landing-bg: #0f172a;
  --landing-text: #ffffff;
  --landing-accent: #D4AF37;
  --landing-accent-glow: rgba(212, 175, 55, 0.5);
  --glass-bg: rgba(255, 255, 255, 0.05);
  --glass-border: rgba(255, 255, 255, 0.1);
  --glass-blur: blur(10px);
}

body {
  background-color: var(--landing-bg);
  color: var(--landing-text);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  overflow-x: hidden;
}

.landing-nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  padding: 20px 0;
  transition: all 0.3s ease;
}

.landing-nav.scrolled {
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(20px);
  padding: 15px 0;
  border-bottom: 1px solid var(--glass-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: 8px;
  font-size: 24px;
  font-weight: 700;
  color: white;
  text-decoration: none;
}

.nav-logo .material-icons {
  color: var(--landing-accent);
}

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

.nav-links a {
  color: rgba(255, 255, 255, 0.7);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.3s ease;
  font-size: 15px;
}

.nav-links a:hover {
  color: white;
}

.nav-cta {
  padding: 10px 24px;
  background: white;
  color: black;
  border-radius: 50px;
  text-decoration: none;
  font-weight: 600;
  font-size: 14px;
  transition: all 0.3s ease;
}

.nav-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(255, 255, 255, 0.2);
}

/* --- Modern Hero Section --- */
.modern-hero {
  min-height: 100vh;
  background: linear-gradient(180deg, #000000 0%, #1a1a2e 50%, #0f0f1e 100%);
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 120px 20px 80px;
}

.hero-gradient-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  opacity: 0.3;
  animation: float 20s infinite ease-in-out;
  pointer-events: none;
}

.orb-1 {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.4), transparent);
  top: -200px;
  left: -200px;
}

.orb-2 {
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(139, 92, 246, 0.3), transparent);
  bottom: -150px;
  right: -150px;
  animation-delay: 5s;
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 900px;
  width: 100%;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 50px;
  color: rgba(255, 255, 255, 0.9);
  font-size: 14px;
  font-weight: 500;
  margin-bottom: 32px;
  backdrop-filter: var(--glass-blur);
  transition: all 0.3s ease;
}

.hero-badge:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(99, 102, 241, 0.5);
}

.hero-title {
  font-size: clamp(48px, 8vw, 80px);
  font-weight: 900;
  line-height: 1.1;
  margin-bottom: 24px;
  background: linear-gradient(135deg, #ffffff 0%, rgba(255, 255, 255, 0.7) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-align: center;
  width: 100%;
}

.hero-title .highlight {
  background: linear-gradient(135deg, #D4AF37, #F9E076);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: clamp(16px, 2vw, 20px);
  color: rgba(255, 255, 255, 0.7);
  line-height: 1.6;
  margin-bottom: 48px;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
  text-align: center;
  width: 100%;
}

.hero-ctas {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.hero-cta-primary {
  padding: 16px 40px;
  background: linear-gradient(135deg, #D4AF37, #F9E076);
  color: white;
  border-radius: 12px;
  font-size: 16px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: all 0.3s ease;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
}

.hero-cta-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 20px 40px rgba(99, 102, 241, 0.4);
}

.hero-cta-secondary {
  padding: 16px 40px;
  background: var(--glass-bg);
  color: white;
  border-radius: 12px;
  font-size: 16px;
  font-weight: 600;
  border: 1px solid var(--glass-border);
  cursor: pointer;
  transition: all 0.3s ease;
  text-decoration: none;
  backdrop-filter: var(--glass-blur);
}

.hero-cta-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.2);
}

/* Floating Elements */
.floating-element {
  position: absolute;
  padding: 12px 16px;
  background: rgba(26, 26, 46, 0.8);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  backdrop-filter: blur(20px);
  display: flex;
  align-items: center;
  gap: 12px;
  transition: all 0.3s ease;
  z-index: 3;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.floating-element:hover {
  transform: translateY(-5px);
  border-color: rgba(99, 102, 241, 0.5);
}

.floating-element .icon {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, #D4AF37, #F9E076);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
}

.floating-element .info h4 {
  font-size: 14px;
  font-weight: 600;
  color: white;
  margin: 0 0 2px 0;
}

.floating-element .info p {
  font-size: 12px;
  color: rgba(255, 255, 255, 0.6);
  margin: 0;
}

.float-left-top {
  top: 15%;
  left: 5%;
  animation: float 6s infinite ease-in-out;
}

.float-right-top {
  top: 20%;
  right: 8%;
  animation: float 5s infinite ease-in-out 1s;
}

.float-left-bottom {
  bottom: 25%;
  left: 8%;
  animation: float 7s infinite ease-in-out 2s;
}

.float-right-bottom {
  bottom: 20%;
  right: 5%;
  animation: float 6s infinite ease-in-out 3s;
}

.scroll-indicator {
  position: absolute;
  bottom: 40px;
  left: 40px;
  display: flex;
  align-items: center;
  gap: 12px;
  color: rgba(255, 255, 255, 0.6);
  font-size: 14px;
  animation: float 2s infinite;
}

.partner-logos {
  position: absolute;
  bottom: 40px;
  right: 40px;
  display: flex;
  gap: 32px;
  align-items: center;
}

.partner-logo {
  color: rgba(255, 255, 255, 0.4);
  font-size: 18px;
  font-weight: 600;
  transition: all 0.3s ease;
}

.partner-logo:hover {
  color: rgba(255, 255, 255, 0.8);
}

/* --- Section Headers --- */
.section-header {
  text-align: center;
  margin-bottom: 60px;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.section-label {
  color: var(--landing-accent);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 2px;
  margin-bottom: 16px;
  text-transform: uppercase;
}

.section-title {
  font-size: 42px;
  font-weight: 800;
  margin-bottom: 16px;
  color: white;
}

.section-subtitle {
  font-size: 18px;
  color: rgba(255, 255, 255, 0.6);
  line-height: 1.6;
}

/* --- Compiler Section --- */
.compiler-section {
  padding: 100px 20px;
  background: #0f0f1e;
}

.compiler-container {
  max-width: 1000px;
  margin: 0 auto;
  background: #1a1a2e;
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid var(--glass-border);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.3);
}

.compiler-tabs {
  display: flex;
  background: rgba(0, 0, 0, 0.3);
  padding: 0 16px;
  border-bottom: 1px solid var(--glass-border);
}

.lang-tab {
  padding: 16px 24px;
  color: rgba(255, 255, 255, 0.6);
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  transition: all 0.3s ease;
  border-bottom: 2px solid transparent;
}

.lang-tab:hover {
  color: white;
}

.lang-tab.active {
  color: var(--landing-accent);
  border-bottom-color: var(--landing-accent);
}

.compiler-body {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  height: 500px;
}

.code-editor-pane {
  display: none;
  height: 100%;
}

.code-editor-pane.active {
  display: block;
}

.code-editor-pane textarea {
  width: 100%;
  height: 100%;
  background: #1a1a2e;
  border: none;
  color: var(--landing-accent);
  font-family: 'Fira Code', monospace;
  font-size: 14px;
  line-height: 1.6;
  padding: 24px;
  resize: none;
}

.code-editor-pane textarea:focus {
  outline: none;
}

.output-pane {
  background: #0d0d16;
  border-left: 1px solid var(--glass-border);
  display: flex;
  flex-direction: column;
}

.output-header {
  padding: 12px 20px;
  border-bottom: 1px solid var(--glass-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.output-title {
  font-size: 12px;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.5);
  text-transform: uppercase;
}

.run-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 16px;
  background: var(--landing-accent);
  color: white;
  border: none;
  border-radius: 4px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.run-btn:hover {
  background: #4f46e5;
}

#codeOutput {
  flex: 1;
  padding: 20px;
  color: rgba(255, 255, 255, 0.8);
  font-family: 'Fira Code', monospace;
  font-size: 14px;
  white-space: pre-wrap;
}

/* --- Categories Section --- */
.categories-section {
  padding: 100px 20px;
  background: #000;
}

.categories-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  max-width: 1200px;
  margin: 0 auto;
}

.category-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 20px;
  padding: 32px;
  transition: all 0.3s ease;
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.category-card:hover {
  transform: translateY(-8px);
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.2);
}

.category-icon {
  width: 56px;
  height: 56px;
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  background: linear-gradient(135deg, #D4AF37, #F9E076);
  color: white;
}

.category-title {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 8px;
  color: white;
}

.category-count {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.5);
}

/* --- Mentors Section --- */
.mentor-section {
  padding: 100px 20px;
  background: #0f0f1e;
}

.mentor-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 32px;
  max-width: 1200px;
  margin: 0 auto;
}

.mentor-card {
  background: #1a1a2e;
  border-radius: 24px;
  padding: 24px;
  text-align: center;
  transition: all 0.3s ease;
  border: 1px solid transparent;
}

.mentor-card:hover {
  transform: translateY(-8px);
  border-color: var(--landing-accent);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.mentor-avatar {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  object-fit: cover;
  margin-bottom: 20px;
  border: 4px solid #0f0f1e;
}

.mentor-avatar-placeholder {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: var(--landing-accent);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 40px;
  font-weight: 700;
  margin: 0 auto 20px;
  border: 4px solid #0f0f1e;
}

.mentor-name {
  font-size: 18px;
  font-weight: 700;
  color: white;
  margin-bottom: 4px;
}

.mentor-role {
  font-size: 14px;
  color: var(--landing-accent);
  margin-bottom: 12px;
  font-weight: 500;
}

.mentor-bio {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.6);
  line-height: 1.6;
}

/* --- Testimonials Section --- */
.testimonials-section {
  padding: 100px 20px;
  background: #000;
}

.testimonial-carousel {
  max-width: 800px;
  margin: 0 auto;
  position: relative;
}

.testimonial-item {
  display: none;
  text-align: center;
  padding: 40px;
  background: var(--glass-bg);
  border-radius: 32px;
  border: 1px solid var(--glass-border);
}

.testimonial-item.active {
  display: block;
  animation: fadeIn 0.5s ease;
}

.testimonial-quote {
  font-size: 24px;
  line-height: 1.5;
  color: white;
  margin-bottom: 32px;
  font-style: italic;
}

.testimonial-author {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
}

.testimonial-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--landing-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: white;
}

.testimonial-info h4 {
  font-size: 16px;
  font-weight: 700;
  color: white;
  margin-bottom: 2px;
}

.testimonial-info p {
  font-size: 12px;
  color: rgba(255, 255, 255, 0.6);
}

.carousel-dots {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 32px;
}

.carousel-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
  cursor: pointer;
  transition: all 0.3s ease;
}

.carousel-dot.active {
  background: var(--landing-accent);
  width: 24px;
  border-radius: 4px;
}

/* --- Stats Section --- */
.stats-section {
  padding: 60px 20px;
  background: #0f0f1e;
  border-top: 1px solid var(--glass-border);
  border-bottom: 1px solid var(--glass-border);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 40px;
  max-width: 1200px;
  margin: 0 auto;
  text-align: center;
}

.stat-item h3 {
  font-size: 48px;
  font-weight: 800;
  color: white;
  margin-bottom: 8px;
  background: linear-gradient(135deg, #fff 0%, #a5a5a5 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.stat-item p {
  font-size: 16px;
  color: rgba(255, 255, 255, 0.6);
  font-weight: 500;
}

/* --- Final CTA Section --- */
.final-cta {
  padding: 120px 20px;
  text-align: center;
  background: linear-gradient(180deg, #000 0%, #1a1a2e 100%);
}

.final-cta h2 {
  font-size: 48px;
  font-weight: 800;
  margin-bottom: 24px;
  color: white;
}

.final-cta p {
  font-size: 20px;
  color: rgba(255, 255, 255, 0.6);
  max-width: 600px;
  margin: 0 auto 48px;
}

.cta-primary {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 20px 48px;
  background: var(--landing-accent);
  color: white;
  border-radius: 50px;
  font-size: 18px;
  font-weight: 700;
  text-decoration: none;
  transition: all 0.3s ease;
  box-shadow: 0 10px 30px rgba(99, 102, 241, 0.3);
}

.cta-primary:hover {
  transform: translateY(-4px);
  box-shadow: 0 20px 40px rgba(99, 102, 241, 0.5);
}

/* --- Responsive --- */
@media (max-width: 768px) {
  .hero-title {
    font-size: 42px;
  }

  .compiler-body {
    grid-template-columns: 1fr;
    height: auto;
  }

  .code-editor-pane {
    height: 300px;
  }

  .nav-links {
    display: none;
  }

  /* Mobile menu needed if full implementation */
  .stats-grid {
    gap: 24px;
  }

  .stat-item h3 {
    font-size: 36px;
  }

  .floating-element {
    display: none;
  }
}

/* --- Auth Pages (Login/Register) --- */
.auth-page {
  min-height: 100vh;
  background: linear-gradient(180deg, #000000 0%, #1a1a2e 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px 20px;
  position: relative;
  overflow: hidden;
}

.auth-card {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: 24px;
  padding: 48px;
  width: 100%;
  max-width: 450px;
  position: relative;
  z-index: 2;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.3);
}

.auth-header {
  text-align: center;
  margin-bottom: 32px;
}

.auth-header h1 {
  font-size: 32px;
  font-weight: 800;
  margin-bottom: 8px;
  background: linear-gradient(135deg, #ffffff 0%, rgba(255, 255, 255, 0.7) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.auth-header p {
  color: rgba(255, 255, 255, 0.6);
  font-size: 16px;
}

.auth-form .form-group {
  margin-bottom: 24px;
}

.auth-form .form-label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: 8px;
}

.auth-form .form-input {
  width: 100%;
  padding: 14px 16px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  color: white;
  font-size: 16px;
  transition: all 0.3s ease;
}

.auth-form .form-input:focus {
  outline: none;
  border-color: var(--landing-accent);
  background: rgba(255, 255, 255, 0.08);
  box-shadow: 0 0 0 4px rgba(212, 175, 55, 0.1);
}

.auth-btn {
  width: 100%;
  padding: 16px;
  background: linear-gradient(135deg, #D4AF37, #F9E076);
  color: white;
  border: none;
  border-radius: 12px;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.auth-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 20px rgba(212, 175, 55, 0.4);
}

.auth-footer {
  margin-top: 32px;
  text-align: center;
  padding-top: 24px;
  border-top: 1px solid var(--glass-border);
  color: rgba(255, 255, 255, 0.6);
  font-size: 14px;
}

.auth-footer a {
  color: var(--landing-accent);
  text-decoration: none;
  font-weight: 600;
}

.auth-footer a:hover {
  text-decoration: underline;
}