/* ============================================
   茶杯狐 APP 官网 - 全局样式
   Domain: chabeihu5.net
   Design: Dark Glassmorphism + Gradient
   ============================================ */

/* ---------- CSS Variables ---------- */
:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #12121a;
  --bg-card: rgba(255, 255, 255, 0.03);
  --bg-glass: rgba(255, 255, 255, 0.05);
  --border-glass: rgba(255, 255, 255, 0.08);
  --text-primary: #f0f0f5;
  --text-secondary: #8a8a9a;
  --text-muted: #55556a;
  --accent-1: #6c5ce7;
  --accent-2: #a855f7;
  --accent-3: #ec4899;
  --accent-4: #06b6d4;
  --gradient-main: linear-gradient(135deg, #6c5ce7 0%, #a855f7 50%, #ec4899 100%);
  --gradient-cool: linear-gradient(135deg, #06b6d4 0%, #6c5ce7 100%);
  --gradient-warm: linear-gradient(135deg, #ec4899 0%, #f97316 100%);
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --shadow-glow: 0 0 60px rgba(108, 92, 231, 0.15);
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --max-width: 1200px;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

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

a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition);
}

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

ul, ol {
  list-style: none;
}

/* ---------- Utility ---------- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 100px 0;
  position: relative;
}

.section-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: 100px;
  background: rgba(108, 92, 231, 0.1);
  border: 1px solid rgba(108, 92, 231, 0.2);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent-2);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 20px;
}

.section-title {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.section-desc {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 600px;
  line-height: 1.8;
}

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

.text-center {
  text-align: center;
}

.mx-auto {
  margin-left: auto;
  margin-right: auto;
}

/* ---------- Animated Background ---------- */
.bg-glow {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.bg-glow::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(ellipse at 20% 50%, rgba(108, 92, 231, 0.08) 0%, transparent 50%),
              radial-gradient(ellipse at 80% 20%, rgba(168, 85, 247, 0.06) 0%, transparent 50%),
              radial-gradient(ellipse at 50% 80%, rgba(236, 72, 153, 0.05) 0%, transparent 50%);
  animation: bgFloat 20s ease-in-out infinite;
}

@keyframes bgFloat {
  0%, 100% { transform: translate(0, 0) rotate(0deg); }
  33% { transform: translate(2%, -2%) rotate(1deg); }
  66% { transform: translate(-1%, 1%) rotate(-1deg); }
}

/* ---------- Navigation ---------- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 16px 0;
  transition: var(--transition);
}

.navbar.scrolled {
  background: rgba(10, 10, 15, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-glass);
  padding: 12px 0;
}

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

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.nav-logo-icon {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: var(--gradient-main);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
}

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

.nav-links a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  padding: 4px 0;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text-primary);
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-main);
  border-radius: 2px;
  transition: width 0.3s ease;
}

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

.nav-cta {
  padding: 10px 24px;
  border-radius: 100px;
  background: var(--gradient-main);
  color: #fff !important;
  font-weight: 600;
  font-size: 0.85rem;
  border: none;
  cursor: pointer;
  transition: var(--transition);
}

.nav-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(108, 92, 231, 0.4);
}

.nav-cta::after {
  display: none !important;
}

/* Mobile Menu */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
  background: none;
  border: none;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition);
}

/* ---------- Hero Section ---------- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 80px;
  position: relative;
  overflow: hidden;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 700px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border-radius: 100px;
  background: rgba(108, 92, 231, 0.1);
  border: 1px solid rgba(108, 92, 231, 0.2);
  font-size: 0.8rem;
  color: var(--accent-2);
  margin-bottom: 28px;
  animation: fadeInUp 0.8s ease;
}

.hero-badge .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #22c55e;
  animation: pulse 2s infinite;
}

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

.hero h1 {
  font-size: clamp(2.8rem, 7vw, 4.5rem);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
  animation: fadeInUp 0.8s ease 0.1s both;
}

.hero p {
  font-size: 1.15rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 40px;
  max-width: 520px;
  animation: fadeInUp 0.8s ease 0.2s both;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  animation: fadeInUp 0.8s ease 0.3s both;
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 32px;
  border-radius: 100px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  text-decoration: none;
  white-space: nowrap;
}

.btn-primary {
  background: var(--gradient-main);
  color: #fff;
  box-shadow: 0 4px 20px rgba(108, 92, 231, 0.3);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 40px rgba(108, 92, 231, 0.5);
}

.btn-secondary {
  background: var(--bg-glass);
  color: var(--text-primary);
  border: 1px solid var(--border-glass);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.15);
  transform: translateY(-3px);
}

.btn-icon {
  font-size: 1.2rem;
}

/* ---------- Glass Card ---------- */
.glass-card {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 32px;
  backdrop-filter: blur(10px);
  transition: var(--transition);
}

.glass-card:hover {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.12);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}

/* ---------- Feature Grid (Bento) ---------- */
.bento-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.bento-grid .glass-card:nth-child(1) {
  grid-column: span 2;
}

.bento-grid .glass-card:nth-child(4) {
  grid-column: span 2;
}

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 20px;
  background: rgba(108, 92, 231, 0.1);
  border: 1px solid rgba(108, 92, 231, 0.15);
}

.feature-icon.cool {
  background: rgba(6, 182, 212, 0.1);
  border-color: rgba(6, 182, 212, 0.15);
}

.feature-icon.warm {
  background: rgba(236, 72, 153, 0.1);
  border-color: rgba(236, 72, 153, 0.15);
}

.glass-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 10px;
  letter-spacing: -0.01em;
}

.glass-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
}

/* ---------- Stats ---------- */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-top: 60px;
}

.stat-item {
  text-align: center;
  padding: 32px 20px;
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
}

.stat-number {
  font-size: 2.5rem;
  font-weight: 900;
  letter-spacing: -0.03em;
  margin-bottom: 4px;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ---------- Screenshots / Mockup ---------- */
.hero-visual {
  position: absolute;
  right: -5%;
  top: 50%;
  transform: translateY(-50%);
  width: 45%;
  max-width: 600px;
  z-index: 1;
  animation: fadeInUp 1s ease 0.4s both;
}

.mockup-container {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

.phone-mockup {
  width: 280px;
  height: 560px;
  border-radius: 40px;
  background: linear-gradient(145deg, #1a1a2e 0%, #16162a 100%);
  border: 2px solid rgba(255, 255, 255, 0.08);
  box-shadow: 0 40px 80px rgba(0, 0, 0, 0.5),
              0 0 0 1px rgba(255, 255, 255, 0.05) inset;
  overflow: hidden;
  position: relative;
}

.phone-screen {
  position: absolute;
  inset: 12px;
  border-radius: 30px;
  background: linear-gradient(180deg, #1e1b4b 0%, #312e81 30%, #4c1d95 60%, #581c87 100%);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  padding: 24px;
}

.phone-screen .app-icon {
  width: 64px;
  height: 64px;
  border-radius: 18px;
  background: var(--gradient-main);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  box-shadow: 0 8px 30px rgba(108, 92, 231, 0.5);
}

.phone-screen .app-name {
  font-size: 1.3rem;
  font-weight: 800;
  color: #fff;
}

.phone-screen .app-tagline {
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.6);
  text-align: center;
}

.phone-screen .mini-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  width: 100%;
  margin-top: 12px;
}

.phone-screen .mini-card {
  padding: 12px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.05);
  text-align: center;
}

.phone-screen .mini-card .mc-icon {
  font-size: 1.2rem;
  margin-bottom: 4px;
}

.phone-screen .mini-card .mc-text {
  font-size: 0.6rem;
  color: rgba(255, 255, 255, 0.5);
}

/* ---------- Download Section ---------- */
.download-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  max-width: 700px;
  margin: 0 auto;
}

.download-card {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 24px 28px;
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  cursor: pointer;
  transition: var(--transition);
}

.download-card:hover {
  background: rgba(255, 255, 255, 0.06);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}

.download-card .dl-icon {
  font-size: 2rem;
  flex-shrink: 0;
}

.download-card .dl-info h4 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 2px;
}

.download-card .dl-info span {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ---------- FAQ ---------- */
.faq-list {
  max-width: 760px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-item {
  border-radius: var(--radius-md);
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  overflow: hidden;
  transition: var(--transition);
}

.faq-item.active {
  border-color: rgba(108, 92, 231, 0.3);
  box-shadow: 0 0 30px rgba(108, 92, 231, 0.08);
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  cursor: pointer;
  font-weight: 600;
  font-size: 1rem;
  user-select: none;
}

.faq-question .faq-toggle {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: rgba(108, 92, 231, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  color: var(--accent-2);
  transition: var(--transition);
  flex-shrink: 0;
}

.faq-item.active .faq-toggle {
  transform: rotate(45deg);
  background: rgba(108, 92, 231, 0.2);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.4s ease;
}

.faq-answer-inner {
  padding: 0 24px 20px;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.8;
}

.faq-item.active .faq-answer {
  max-height: 300px;
}

/* ---------- Footer ---------- */
.footer {
  padding: 60px 0 30px;
  border-top: 1px solid var(--border-glass);
  background: var(--bg-secondary);
}

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

.footer-brand p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-top: 12px;
  max-width: 280px;
  line-height: 1.7;
}

.footer-col h4 {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 16px;
  color: var(--text-muted);
}

.footer-col a {
  display: block;
  font-size: 0.9rem;
  color: var(--text-secondary);
  padding: 4px 0;
}

.footer-col a:hover {
  color: var(--text-primary);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 24px;
  border-top: 1px solid var(--border-glass);
  font-size: 0.8rem;
  color: var(--text-muted);
}

.footer-social {
  display: flex;
  gap: 16px;
}

.footer-social a {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  transition: var(--transition);
}

.footer-social a:hover {
  background: rgba(108, 92, 231, 0.15);
  border-color: rgba(108, 92, 231, 0.3);
  transform: translateY(-2px);
}

/* ---------- Scroll Animations ---------- */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- Page Hero (Inner Pages) ---------- */
.page-hero {
  padding: 160px 0 80px;
  text-align: center;
  position: relative;
}

.page-hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.5rem);
  font-weight: 900;
  letter-spacing: -0.03em;
  margin-bottom: 16px;
}

.page-hero p {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto;
  line-height: 1.8;
}

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

.about-text h2 {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.about-text p {
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.8;
  margin-bottom: 16px;
}

.about-visual {
  display: flex;
  justify-content: center;
}

.about-card {
  width: 100%;
  max-width: 400px;
  padding: 40px;
  border-radius: var(--radius-xl);
  background: linear-gradient(145deg, rgba(108, 92, 231, 0.08) 0%, rgba(236, 72, 153, 0.05) 100%);
  border: 1px solid var(--border-glass);
  text-align: center;
}

.about-card .big-emoji {
  font-size: 4rem;
  margin-bottom: 20px;
}

.about-card h3 {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.about-card p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* ---------- Timeline ---------- */
.timeline {
  max-width: 700px;
  margin: 60px auto 0;
  position: relative;
  padding-left: 40px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 12px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--accent-1), var(--accent-3));
  border-radius: 2px;
}

.timeline-item {
  position: relative;
  padding-bottom: 40px;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -33px;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent-2);
  border: 3px solid var(--bg-primary);
  box-shadow: 0 0 12px rgba(168, 85, 247, 0.4);
}

.timeline-item h4 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 4px;
}

.timeline-item .time {
  font-size: 0.8rem;
  color: var(--accent-2);
  margin-bottom: 8px;
}

.timeline-item p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.7;
}

/* ---------- Legal Pages ---------- */
.legal-content {
  max-width: 760px;
  margin: 0 auto;
}

.legal-content h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-top: 40px;
  margin-bottom: 16px;
  letter-spacing: -0.01em;
}

.legal-content p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.9;
  margin-bottom: 16px;
}

.legal-content ul {
  padding-left: 20px;
  margin-bottom: 16px;
}

.legal-content ul li {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.8;
  padding: 4px 0;
  position: relative;
  padding-left: 16px;
}

.legal-content ul li::before {
  content: '•';
  position: absolute;
  left: 0;
  color: var(--accent-2);
}

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .hero-visual {
    display: none;
  }
  .hero-content {
    max-width: 100%;
  }
  .bento-grid {
    grid-template-columns: 1fr 1fr;
  }
  .bento-grid .glass-card:nth-child(1),
  .bento-grid .glass-card:nth-child(4) {
    grid-column: span 1;
  }
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 30px;
  }
  .about-content {
    grid-template-columns: 1fr;
    gap: 40px;
  }
}

@media (max-width: 768px) {
  .section {
    padding: 70px 0;
  }
  .nav-links {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(10, 10, 15, 0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 24px;
    z-index: 999;
  }
  .nav-links.open {
    display: flex;
  }
  .nav-links a {
    font-size: 1.2rem;
  }
  .nav-toggle {
    display: flex;
    z-index: 1001;
  }
  .bento-grid {
    grid-template-columns: 1fr;
  }
  .download-grid {
    grid-template-columns: 1fr;
  }
  .stats-grid {
    grid-template-columns: 1fr 1fr;
    gap: 12px;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  .footer-bottom {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }
  .hero-actions {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 480px) {
  .stats-grid {
    grid-template-columns: 1fr;
  }
  .stat-item {
    padding: 20px;
  }
}