/* ============================================
   SupMiner Edu - 区块链技术教育平台
   Author: Davey Wong
   ============================================ */

/* ---------- CSS Variables ---------- */
:root {
  --primary: #0a1628;
  --primary-light: #0f1f3d;
  --accent: #f0b90b;
  --accent-dark: #d4a308;
  --accent-glow: rgba(240, 185, 11, 0.3);
  --text: #e0e6ed;
  --text-muted: #8899aa;
  --card-bg: #0f1f3d;
  --card-border: #1a2d4a;
  --gradient-1: linear-gradient(135deg, #0a1628 0%, #1a2d4a 100%);
  --gradient-accent: linear-gradient(135deg, #f0b90b 0%, #d4a308 100%);
  --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
  --shadow-glow: 0 0 30px rgba(240, 185, 11, 0.15);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-main);
  background: var(--primary);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: #fff; }

img { max-width: 100%; height: auto; }
ul { list-style: none; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* ---------- Section Titles ---------- */
.section-title {
  text-align: center;
  margin-bottom: 60px;
}

.section-title .tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--accent);
  background: rgba(240, 185, 11, 0.1);
  border: 1px solid rgba(240, 185, 11, 0.2);
  padding: 4px 16px;
  border-radius: 20px;
  margin-bottom: 16px;
}

.section-title h2 {
  font-size: 2.25rem;
  font-weight: 700;
  background: linear-gradient(135deg, #fff 0%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-title p {
  color: var(--text-muted);
  font-size: 1.1rem;
  margin-top: 12px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* ---------- Navbar ---------- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(10, 22, 40, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  transition: all var(--transition);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

.navbar .logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.35rem;
  font-weight: 700;
  color: #fff;
}

.navbar .logo .logo-icon {
  width: 36px;
  height: 36px;
  background: var(--gradient-accent);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--primary);
}

.navbar .logo span { color: var(--accent); }

.nav-links { display: flex; align-items: center; gap: 32px; }

.nav-links a {
  color: var(--text-muted);
  font-size: 0.9rem;
  font-weight: 500;
  position: relative;
}

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

.nav-links a:hover::after,
.nav-links a.active::after { width: 100%; }

.nav-links a:hover, .nav-links a.active { color: #fff; }

.nav-cta {
  background: var(--gradient-accent);
  color: var(--primary) !important;
  padding: 8px 20px;
  border-radius: 8px;
  font-weight: 600 !important;
}

.nav-cta::after { display: none !important; }
.nav-cta:hover { transform: translateY(-1px); box-shadow: var(--shadow-glow); }

.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: #fff;
  font-size: 1.5rem;
  cursor: pointer;
  padding: 4px;
}

/* ---------- Hero ---------- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding-top: 70px;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(240, 185, 11, 0.05) 0%, transparent 70%);
  pointer-events: none;
}

.hero-grid-bg {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(240, 185, 11, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(240, 185, 11, 0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
}

.hero .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-content .badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--accent);
  background: rgba(240, 185, 11, 0.1);
  border: 1px solid rgba(240, 185, 11, 0.2);
  padding: 6px 16px;
  border-radius: 20px;
  margin-bottom: 24px;
}

.hero-content .badge .dot {
  width: 6px;
  height: 6px;
  background: var(--accent);
  border-radius: 50%;
  animation: pulse-dot 2s infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.hero-content h1 {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 20px;
}

.hero-content h1 .highlight {
  background: linear-gradient(135deg, var(--accent) 0%, #ffd700 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-content p {
  color: var(--text-muted);
  font-size: 1.15rem;
  margin-bottom: 32px;
  max-width: 520px;
}

.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 10px;
  font-size: 1rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: all var(--transition);
}

.btn-primary {
  background: var(--gradient-accent);
  color: var(--primary);
}

.btn-primary:hover { transform: translateY(-2px); box-shadow: var(--shadow-glow); color: var(--primary); }

.btn-outline {
  background: transparent;
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.btn-outline:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-2px); }

.hero-visual {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 32px;
  width: 100%;
  max-width: 420px;
  box-shadow: var(--shadow);
}

.hero-card .card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--card-border);
}

.hero-card .card-header h3 { font-size: 1rem; color: var(--text-muted); }
.hero-card .card-header .live { color: #4ade80; font-size: 0.75rem; }

.hero-card .stat {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.hero-card .stat:last-child { border-bottom: none; }
.hero-card .stat .label { color: var(--text-muted); font-size: 0.9rem; }
.hero-card .stat .value { font-weight: 600; font-family: var(--font-mono); }

.hero-card .stat .value.gold { color: var(--accent); }
.hero-card .stat .value.green { color: #4ade80; }
.hero-card .stat .value.blue { color: #60a5fa; }

/* ---------- Features / Why Us ---------- */
.features {
  padding: 100px 0;
  position: relative;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 32px;
  transition: all var(--transition);
}

.feature-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}

.feature-icon {
  width: 48px;
  height: 48px;
  background: rgba(240, 185, 11, 0.1);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  margin-bottom: 20px;
}

.feature-card h3 { font-size: 1.15rem; margin-bottom: 12px; }
.feature-card p { color: var(--text-muted); font-size: 0.9rem; line-height: 1.7; }

/* ---------- Courses ---------- */
.courses {
  padding: 100px 0;
  background: linear-gradient(180deg, var(--primary) 0%, var(--primary-light) 100%);
}

.courses-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.course-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: all var(--transition);
}

.course-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}

.course-banner {
  height: 100px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
}

.course-banner.b1 { background: linear-gradient(135deg, #1a2d4a, #0a1628); }
.course-banner.b2 { background: linear-gradient(135deg, #2d1a4a, #0a1628); }
.course-banner.b3 { background: linear-gradient(135deg, #1a4a2d, #0a1628); }
.course-banner.b4 { background: linear-gradient(135deg, #4a2d1a, #0a1628); }
.course-banner.b5 { background: linear-gradient(135deg, #1a2d4a, #2d1a4a); }
.course-banner.b6 { background: linear-gradient(135deg, #1a4a2d, #2d1a4a); }

.course-body { padding: 24px; }

.course-body .level {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  padding: 2px 10px;
  border-radius: 4px;
  margin-bottom: 12px;
}

.level-beginner { background: rgba(74, 222, 128, 0.1); color: #4ade80; }
.level-intermediate { background: rgba(96, 165, 250, 0.1); color: #60a5fa; }
.level-advanced { background: rgba(240, 185, 11, 0.1); color: var(--accent); }

.course-body h3 { font-size: 1.1rem; margin-bottom: 8px; }
.course-body p { color: var(--text-muted); font-size: 0.85rem; margin-bottom: 16px; }
.course-body .meta { display: flex; gap: 20px; font-size: 0.8rem; color: var(--text-muted); }
.course-body .meta span { display: flex; align-items: center; gap: 4px; }

/* ---------- Pricing ---------- */
.pricing {
  padding: 100px 0;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  align-items: start;
}

.pricing-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 40px 32px;
  text-align: center;
  transition: all var(--transition);
  position: relative;
}

.pricing-card.featured {
  border-color: var(--accent);
  transform: scale(1.05);
  box-shadow: var(--shadow-glow);
}

.pricing-card.featured .popular-tag {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--gradient-accent);
  color: var(--primary);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 20px;
  border-radius: 20px;
}

.pricing-card:hover { border-color: var(--accent); }

.pricing-card h3 { font-size: 1.2rem; margin-bottom: 8px; }
.pricing-card .subtitle { color: var(--text-muted); font-size: 0.85rem; margin-bottom: 24px; }

.pricing-card .price {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 4px;
}

.pricing-card .price .currency { font-size: 1.2rem; color: var(--text-muted); }
.pricing-card .price .period { font-size: 0.9rem; color: var(--text-muted); font-weight: 400; }

.pricing-card .price-desc { color: var(--text-muted); font-size: 0.8rem; margin-bottom: 28px; }

.pricing-card .features-list { text-align: left; margin-bottom: 32px; }

.pricing-card .features-list li {
  padding: 10px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: 10px;
}

.pricing-card .features-list li::before {
  content: '✓';
  color: var(--accent);
  font-weight: 700;
}

.pricing-card .features-list li.missing { color: var(--text-muted); }
.pricing-card .features-list li.missing::before { content: '—'; color: #555; }

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

/* ---------- Booking ---------- */
.booking {
  padding: 100px 0;
  background: linear-gradient(180deg, var(--primary-light) 0%, var(--primary) 100%);
}

.booking-wrapper {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: start;
}

.booking-info h2 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.booking-info > p {
  color: var(--text-muted);
  margin-bottom: 32px;
}

.booking-info .info-item {
  display: flex;
  gap: 16px;
  margin-bottom: 24px;
}

.booking-info .info-icon {
  width: 44px;
  height: 44px;
  min-width: 44px;
  background: rgba(240, 185, 11, 0.1);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
}

.booking-info .info-text h4 { font-size: 1rem; margin-bottom: 4px; }
.booking-info .info-text p { color: var(--text-muted); font-size: 0.9rem; }

.booking-form {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 32px;
}

.form-group { margin-bottom: 20px; }

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 6px;
  color: var(--text-muted);
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  background: var(--primary);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-sm);
  color: #fff;
  font-size: 0.95rem;
  font-family: var(--font-main);
  transition: border-color var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent);
}

.form-group textarea { resize: vertical; min-height: 100px; }

.form-group select option { background: var(--primary); }

.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }

/* ---------- Testimonials ---------- */
.testimonials {
  padding: 100px 0;
}

.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.testimonial-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 32px;
  transition: all var(--transition);
}

.testimonial-card:hover { border-color: rgba(240, 185, 11, 0.3); }

.testimonial-card .stars {
  color: var(--accent);
  font-size: 0.9rem;
  margin-bottom: 16px;
}

.testimonial-card blockquote {
  color: var(--text);
  font-size: 0.9rem;
  line-height: 1.8;
  margin-bottom: 20px;
  font-style: italic;
}

.testimonial-card .author {
  display: flex;
  align-items: center;
  gap: 12px;
}

.testimonial-card .avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--gradient-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--primary);
}

.testimonial-card .author-info .name { font-weight: 600; font-size: 0.9rem; }
.testimonial-card .author-info .title { color: var(--text-muted); font-size: 0.8rem; }

/* ---------- Footer ---------- */
.footer {
  background: var(--primary-light);
  border-top: 1px solid var(--card-border);
  padding: 60px 0 30px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand .logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.2rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 16px;
}

.footer-brand .logo .logo-icon {
  width: 32px;
  height: 32px;
  background: var(--gradient-accent);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  font-weight: 800;
  color: var(--primary);
}

.footer-brand .logo span { color: var(--accent); }

.footer-brand p { color: var(--text-muted); font-size: 0.9rem; max-width: 320px; }

.footer h4 {
  font-size: 0.9rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 16px;
  color: #fff;
}

.footer ul li { margin-bottom: 10px; }
.footer ul a { color: var(--text-muted); font-size: 0.9rem; }
.footer ul a:hover { color: var(--accent); }

.footer-bottom {
  border-top: 1px solid var(--card-border);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ---------- Page Header ---------- */
.page-header {
  padding: 140px 0 60px;
  text-align: center;
  position: relative;
}

.page-header h1 {
  font-size: 2.75rem;
  font-weight: 800;
  margin-bottom: 12px;
}

.page-header p {
  color: var(--text-muted);
  font-size: 1.1rem;
  max-width: 600px;
  margin: 0 auto;
}

/* ---------- About Page ---------- */
.about-section {
  padding: 0 0 100px;
}

.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.about-content h2 {
  font-size: 1.75rem;
  margin-bottom: 16px;
}

.about-content p {
  color: var(--text-muted);
  margin-bottom: 16px;
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.stat-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 24px;
  text-align: center;
}

.stat-card .number {
  font-size: 2rem;
  font-weight: 800;
  color: var(--accent);
  font-family: var(--font-mono);
}

.stat-card .stat-label { color: var(--text-muted); font-size: 0.85rem; margin-top: 4px; }

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .hero-content h1 { font-size: 2.5rem; }
  .features-grid,
  .courses-grid,
  .pricing-grid,
  .testimonials-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .menu-toggle { display: block; }
  .nav-links {
    display: none;
    position: absolute;
    top: 70px;
    left: 0;
    right: 0;
    background: rgba(10, 22, 40, 0.95);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 20px 24px;
    gap: 16px;
    border-bottom: 1px solid var(--card-border);
  }
  .nav-links.open { display: flex; }
  .nav-links a { font-size: 1rem; }

  .hero .container {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-content h1 { font-size: 2rem; }
  .hero-content p { margin-left: auto; margin-right: auto; }
  .hero-actions { justify-content: center; }
  .hero-visual { display: none; }

  .section-title h2 { font-size: 1.75rem; }

  .features-grid,
  .courses-grid,
  .pricing-grid,
  .testimonials-grid { grid-template-columns: 1fr; }

  .pricing-card.featured { transform: none; }

  .booking-wrapper { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .about-content { grid-template-columns: 1fr; }

  .footer-grid { grid-template-columns: 1fr 1fr; }

  .page-header h1 { font-size: 2rem; }
}

@media (max-width: 480px) {
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }
}