/* ═══════════════════════════════════════════════════════════
   老高AIGC · 主站样式
   设计关键词：大厂感 · 喜乐 · 活泼 · 格局 · 易付费
   三層漏斗：免费薅人 → Coze VIP ¥198 → Claude/Codex 升级
   ═══════════════════════════════════════════════════════════ */

/* ── CSS Variables ── */
:root {
  --bg-deep: #080c1a;
  --bg-primary: #0f1425;
  --bg-card: #161b30;
  --bg-card-hover: #1c2240;
  --border: #252b48;
  --border-light: #323960;

  --text-primary: #f0f2fc;
  --text-secondary: #b4b8cd;
  --text-muted: #6b7094;

  --brand-blue: #4f6ef7;
  --brand-purple: #8b5cf6;
  --brand-gradient: linear-gradient(135deg, #4f6ef7, #8b5cf6);
  --brand-gradient-warm: linear-gradient(135deg, #f59e0b, #ef4444);
  --brand-gradient-green: linear-gradient(135deg, #10b981, #06b6d4);

  --accent-gold: #f59e0b;
  --accent-green: #10b981;
  --accent-red: #ef4444;
  --accent-pink: #ec4899;

  --shadow-sm: 0 2px 8px rgba(0,0,0,0.3);
  --shadow-md: 0 8px 32px rgba(0,0,0,0.4);
  --shadow-lg: 0 16px 64px rgba(0,0,0,0.5);
  --shadow-glow-blue: 0 0 40px rgba(79,110,247,0.15);
  --shadow-glow-purple: 0 0 40px rgba(139,92,246,0.15);
  --shadow-glow-gold: 0 0 40px rgba(245,158,11,0.15);

  --radius-sm: 8px;
  --radius: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;

  --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
  --font-display: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-deep);
  color: var(--text-primary);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a { color: var(--brand-blue); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--brand-purple); }

img { max-width: 100%; height: auto; }

/* ── Background Ornaments ── */
.bg-ornament {
  position: fixed;
  pointer-events: none;
  z-index: 0;
  opacity: 0.4;
  filter: blur(120px);
}
.bg-orb-1 {
  top: -200px; left: -100px;
  width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(79,110,247,0.12) 0%, transparent 70%);
}
.bg-orb-2 {
  bottom: 10%; right: -150px;
  width: 500px; height: 500px;
  background: radial-gradient(circle, rgba(139,92,246,0.10) 0%, transparent 70%);
}
.bg-orb-3 {
  top: 50%; left: 40%;
  width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(245,158,11,0.06) 0%, transparent 70%);
}
.bg-grid {
  position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background-image:
    linear-gradient(rgba(255,255,255,0.015) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.015) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 30%, black 30%, transparent 70%);
}

/* ── Container ── */
.container {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

/* ── Section base ── */
.section {
  padding: 80px 0;
  position: relative;
}
.section-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 6px 16px;
  border-radius: 100px;
  margin-bottom: 16px;
}
.section-title {
  font-family: var(--font-display);
  font-size: clamp(32px, 5vw, 48px);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}
.section-subtitle {
  font-size: 18px;
  color: var(--text-secondary);
  max-width: 600px;
}

/* ── Nav ── */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 16px 0;
  background: rgba(8,12,26,0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255,255,255,0.04);
  transition: all 0.3s;
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}
.nav-brand {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 800;
  background: var(--brand-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
  list-style: none;
}
.nav-links a {
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 500;
  transition: color 0.2s;
}
.nav-links a:hover { color: var(--text-primary); }
.nav-cta {
  background: var(--brand-gradient);
  color: #fff !important;
  padding: 8px 20px;
  border-radius: 100px;
  font-weight: 600 !important;
}
.nav-cta:hover {
  box-shadow: var(--shadow-glow-blue);
  transform: translateY(-1px);
}

/* ── Hero ── */
.hero {
  padding: 160px 0 100px;
  text-align: center;
  position: relative;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(79,110,247,0.1);
  border: 1px solid rgba(79,110,247,0.2);
  padding: 8px 20px;
  border-radius: 100px;
  font-size: 14px;
  font-weight: 500;
  color: var(--brand-blue);
  margin-bottom: 28px;
}
.hero-badge .dot {
  width: 8px; height: 8px;
  background: var(--accent-green);
  border-radius: 50%;
  animation: pulse-dot 2s infinite;
}
@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}
.hero-title {
  font-family: var(--font-display);
  font-size: clamp(40px, 7vw, 72px);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
}
.hero-title .gradient-text {
  background: var(--brand-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-desc {
  font-size: 20px;
  color: var(--text-secondary);
  max-width: 640px;
  margin: 0 auto 40px;
  line-height: 1.6;
}
.hero-stats {
  display: flex;
  justify-content: center;
  gap: 48px;
  margin-bottom: 44px;
  flex-wrap: wrap;
}
.hero-stat {
  text-align: center;
}
.hero-stat-num {
  font-size: 36px;
  font-weight: 900;
  background: var(--brand-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-stat-label {
  font-size: 14px;
  color: var(--text-muted);
  margin-top: 4px;
}
.hero-actions {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 100px;
  font-size: 16px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: all 0.25s;
  text-decoration: none;
  white-space: nowrap;
}
.btn-primary {
  background: var(--brand-gradient);
  color: #fff;
  box-shadow: var(--shadow-glow-blue);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 60px rgba(79,110,247,0.3);
  color: #fff;
}
.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 1.5px solid var(--border-light);
}
.btn-outline:hover {
  border-color: var(--brand-blue);
  background: rgba(79,110,247,0.06);
  color: var(--text-primary);
}
.btn-gold {
  background: var(--brand-gradient-warm);
  color: #fff;
  box-shadow: 0 0 30px rgba(245,158,11,0.2);
}
.btn-gold:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 50px rgba(245,158,11,0.35);
  color: #fff;
}
.btn-lg {
  padding: 18px 40px;
  font-size: 18px;
}
.btn-sm {
  padding: 8px 18px;
  font-size: 14px;
}
.btn-block {
  width: 100%;
  justify-content: center;
}
.btn:disabled, .btn-loading {
  opacity: 0.6;
  pointer-events: none;
}

/* ── Cards ── */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: all 0.3s;
}
.card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-light);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}
.card-glow-blue { border-color: rgba(79,110,247,0.2); }
.card-glow-blue:hover { border-color: rgba(79,110,247,0.4); box-shadow: var(--shadow-glow-blue); }
.card-glow-gold { border-color: rgba(245,158,11,0.2); }
.card-glow-gold:hover { border-color: rgba(245,158,11,0.4); box-shadow: var(--shadow-glow-gold); }
.card-glow-green { border-color: rgba(16,185,129,0.2); }
.card-glow-green:hover { border-color: rgba(16,185,129,0.4); box-shadow: 0 0 40px rgba(16,185,129,0.1); }

/* ── Layer cards ── */
.layer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
  margin-top: 48px;
}
.layer-card {
  position: relative;
  overflow: hidden;
}
.layer-card .layer-icon {
  font-size: 48px;
  margin-bottom: 20px;
  display: block;
}
.layer-card .layer-tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 4px 12px;
  border-radius: 100px;
  margin-bottom: 16px;
}
.tag-free { background: rgba(16,185,129,0.12); color: var(--accent-green); }
.tag-vip { background: rgba(245,158,11,0.12); color: var(--accent-gold); }
.tag-pro { background: rgba(139,92,246,0.12); color: var(--brand-purple); }
.layer-card h3 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 8px;
}
.layer-card .price {
  font-size: 40px;
  font-weight: 900;
  margin: 16px 0 8px;
}
.layer-card .price-original {
  font-size: 16px;
  color: var(--text-muted);
  text-decoration: line-through;
  margin-left: 8px;
}
.layer-card .features {
  list-style: none;
  margin: 20px 0;
}
.layer-card .features li {
  padding: 6px 0;
  font-size: 15px;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 8px;
}
.layer-card .features li::before {
  content: '✓';
  color: var(--accent-green);
  font-weight: 700;
  flex-shrink: 0;
}
.layer-card .btn {
  margin-top: 12px;
}

/* ── Testimonial ── */
.testimonial-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
  margin-top: 40px;
}
.testimonial-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
}
.testimonial-card .quote {
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: 16px;
  font-style: italic;
}
.testimonial-card .author {
  display: flex;
  align-items: center;
  gap: 10px;
}
.testimonial-card .author-avatar {
  width: 40px; height: 40px;
  border-radius: 50%;
  background: var(--brand-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 16px;
}
.testimonial-card .author-name {
  font-weight: 600;
  font-size: 14px;
}
.testimonial-card .author-role {
  font-size: 12px;
  color: var(--text-muted);
}

/* ── FAQ Accordion ── */
.faq-list {
  max-width: 760px;
  margin: 40px auto 0;
}
.faq-item {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
  background: var(--bg-card);
}
.faq-question {
  width: 100%;
  padding: 20px 24px;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 16px;
  font-weight: 600;
  text-align: left;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}
.faq-question .faq-icon {
  font-size: 20px;
  transition: transform 0.3s;
  flex-shrink: 0;
}
.faq-item.open .faq-icon { transform: rotate(45deg); }
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
}
.faq-item.open .faq-answer {
  max-height: 500px;
  padding: 0 24px 20px;
}
.faq-answer p {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ── CTA Toast / Modal ── */
.toast {
  position: fixed;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  padding: 14px 24px;
  border-radius: 100px;
  font-size: 14px;
  font-weight: 500;
  z-index: 200;
  transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 10px;
}
.toast.show { transform: translateX(-50%) translateY(0); }
.toast.success { border-color: rgba(16,185,129,0.4); }

.modal-overlay {
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.7);
  backdrop-filter: blur(4px);
  z-index: 150;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s;
}
.modal-overlay.show {
  opacity: 1;
  pointer-events: all;
}
.modal {
  background: var(--bg-primary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  padding: 40px;
  max-width: 440px;
  width: 90%;
  text-align: center;
  box-shadow: var(--shadow-lg);
}
.modal h3 { font-size: 24px; margin-bottom: 12px; }
.modal p { color: var(--text-secondary); margin-bottom: 24px; font-size: 15px; }
.modal .wechat-id {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 14px 28px;
  border-radius: 100px;
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: all 0.2s;
  margin-bottom: 12px;
}
.modal .wechat-id:hover {
  border-color: var(--accent-green);
  background: rgba(16,185,129,0.08);
}
.modal .copy-hint {
  font-size: 12px;
  color: var(--text-muted);
}

/* ── Netdisk Section ── */
.netdisk-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 20px;
  margin-top: 32px;
}
.netdisk-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  text-align: center;
  transition: all 0.3s;
}
.netdisk-card:hover {
  border-color: var(--accent-green);
  background: var(--bg-card-hover);
  transform: translateY(-2px);
}
.netdisk-card .disk-icon {
  font-size: 40px;
  margin-bottom: 12px;
}
.netdisk-card h4 { font-size: 18px; margin-bottom: 6px; }
.netdisk-card p { font-size: 13px; color: var(--text-muted); margin-bottom: 16px; }

/* ── Footer ── */
.footer {
  text-align: center;
  padding: 48px 24px;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 14px;
}
.footer a { color: var(--text-secondary); }

/* ── Responsive ── */
@media (max-width: 768px) {
  .nav-links { display: none; }
  .hero { padding: 120px 0 60px; }
  .hero-stats { gap: 24px; }
  .section { padding: 56px 0; }
  .layer-grid { grid-template-columns: 1fr; }
  .testimonial-grid { grid-template-columns: 1fr; }
  .netdisk-grid { grid-template-columns: 1fr; }
  .hero-actions { flex-direction: column; align-items: center; }
  .btn { width: 100%; justify-content: center; }
}

@media (max-width: 480px) {
  .hero-title { font-size: 32px; }
  .section-title { font-size: 28px; }
  .container { padding: 0 16px; }
}

/* ── Step Indicator ── */
.steps {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  margin: 40px 0;
  flex-wrap: wrap;
}
.step {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 24px;
}
.step-num {
  width: 40px; height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 18px;
  flex-shrink: 0;
}
.step-1 .step-num { background: rgba(16,185,129,0.15); color: var(--accent-green); }
.step-2 .step-num { background: rgba(245,158,11,0.15); color: var(--accent-gold); }
.step-3 .step-num { background: rgba(139,92,246,0.15); color: var(--brand-purple); }
.step-text { font-size: 14px; font-weight: 500; }
.step-arrow {
  color: var(--text-muted);
  font-size: 20px;
  margin: 0 4px;
}

/* ── Scroll Reveal ── */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}

/* ── Ribbon Badge ── */
.ribbon {
  display: inline-block;
  position: relative;
  padding: 6px 16px;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  border-radius: 4px;
}
.ribbon-hot {
  background: linear-gradient(135deg, #ef4444, #f59e0b);
  color: #fff;
}
.ribbon-new {
  background: linear-gradient(135deg, #10b981, #06b6d4);
  color: #fff;
}
.ribbon-boom {
  background: linear-gradient(135deg, #ec4899, #8b5cf6);
  color: #fff;
}