/* MissAI — 炫紫多彩 + 深色背景 */
:root {
  --color-primary: #8B5CF6;
  --color-primary-hover: #7C3AED;
  --color-primary-light: #A78BFA;
  --color-primary-lighter: #C4B5FD;
  --color-gold: #F5C842;
  --color-pink: #F472B6;
  --color-orange: #F97316;
  --color-green: #22C55E;
  --bg-0: #0F0B22;
  --bg-1: #1A1530;
  --bg-2: #15112A;
  --bg-card: #241F3D;
  --bg-input: #2A2545;
  --bg-banner: #3B2D5C;
  --text-1: #F5F3FF;
  --text-2: #A8A0C2;
  --text-3: #6F6789;
  --gradient-purple: linear-gradient(135deg, #8B5CF6 0%, #C4B5FD 100%);
  --gradient-mint: linear-gradient(135deg, #5EEAD4 0%, #93C5FD 100%);
  --gradient-gold: linear-gradient(135deg, #F5C842 0%, #F97316 100%);
  --hero-bg: radial-gradient(ellipse at 70% 30%, rgba(139, 92, 246, 0.18) 0%, var(--bg-1) 70%);
  --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.35);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --header-h: 72px;
  --transition: 0.3s ease;
  --font-sans: 'Noto Sans SC', 'Noto Sans', system-ui, sans-serif;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-h);
}

body {
  font-family: var(--font-sans);
  background: var(--bg-0);
  color: var(--text-1);
  line-height: 1.6;
  overflow-x: hidden;
}

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

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

a:hover {
  color: var(--color-primary-lighter);
}

ul {
  list-style: none;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ========== Header ========== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-h);
  background: rgba(15, 11, 34, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(139, 92, 246, 0.15);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-h);
  gap: 16px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-1);
  font-weight: 700;
  font-size: 1.25rem;
  flex-shrink: 0;
}

.logo img {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
}

.logo:hover {
  color: var(--color-primary-light);
}

.nav-main {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-main a {
  color: var(--text-2);
  font-size: 0.9rem;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
}

.nav-main a:hover,
.nav-main a.active {
  color: var(--text-1);
  background: rgba(139, 92, 246, 0.15);
}

.nav-main a i {
  font-size: 0.85rem;
  color: var(--color-primary-light);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* Language switcher */
.lang-switcher {
  position: relative;
}

.lang-toggle {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 12px;
  background: var(--bg-card);
  border: 1px solid rgba(139, 92, 246, 0.25);
  border-radius: var(--radius-sm);
  color: var(--text-2);
  font-size: 0.875rem;
  cursor: pointer;
  font-family: inherit;
  transition: border-color var(--transition), color var(--transition);
}

.lang-toggle:hover,
.lang-switcher.open .lang-toggle {
  border-color: var(--color-primary);
  color: var(--text-1);
}

.lang-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  min-width: 140px;
  background: var(--bg-card);
  border: 1px solid rgba(139, 92, 246, 0.25);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: opacity var(--transition), transform var(--transition), visibility var(--transition);
  z-index: 100;
}

.lang-switcher.open .lang-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.lang-dropdown a {
  display: block;
  padding: 10px 16px;
  color: var(--text-2);
  font-size: 0.875rem;
}

.lang-dropdown a:hover,
.lang-dropdown a.current {
  background: rgba(139, 92, 246, 0.15);
  color: var(--text-1);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  font-family: inherit;
  transition: transform var(--transition), box-shadow var(--transition), opacity var(--transition);
  text-decoration: none;
}

.btn:active {
  transform: scale(0.97);
}

.btn-primary {
  background: var(--gradient-purple);
  color: var(--text-1);
  box-shadow: 0 4px 20px rgba(139, 92, 246, 0.4);
}

.btn-primary:hover {
  box-shadow: 0 6px 28px rgba(139, 92, 246, 0.55);
  color: var(--text-1);
}

.btn-outline {
  background: transparent;
  color: var(--text-1);
  border: 2px solid var(--color-primary);
}

.btn-outline:hover {
  background: rgba(139, 92, 246, 0.15);
  color: var(--text-1);
}

.btn-gold {
  background: var(--gradient-gold);
  color: #1a1028;
  box-shadow: 0 4px 20px rgba(245, 200, 66, 0.3);
}

.btn-sm {
  padding: 8px 16px;
  font-size: 0.85rem;
}

/* Mobile menu */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-1);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 8px;
}

/* ========== Hero ========== */
.hero {
  min-height: auto;
  padding: calc(var(--header-h) + 28px) 0 40px;
  background: var(--hero-bg);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(244, 114, 182, 0.12) 0%, transparent 70%);
  top: 10%;
  left: -10%;
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(94, 234, 212, 0.08) 0%, transparent 70%);
  bottom: 20%;
  right: 5%;
  pointer-events: none;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 12px;
  background: var(--bg-banner);
  border-radius: 999px;
  font-size: 0.75rem;
  color: var(--color-gold);
  margin-bottom: 12px;
  border: 1px solid rgba(245, 200, 66, 0.3);
}

.hero h1 {
  font-size: clamp(1.75rem, 4.5vw, 2.75rem);
  line-height: 1.25;
  margin-bottom: 10px;
  background: var(--gradient-purple);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1rem;
  color: var(--text-2);
  margin-bottom: 14px;
  max-width: 540px;
  line-height: 1.55;
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
}

.hero-tags span {
  padding: 6px 14px;
  background: var(--bg-card);
  border-radius: 999px;
  font-size: 0.8rem;
  color: var(--text-2);
  border: 1px solid rgba(139, 92, 246, 0.2);
}

.hero-tags span i {
  color: var(--color-green);
  margin-right: 4px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.hero-visual {
  position: relative;
}

.hero-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 20px;
  border: 1px solid rgba(139, 92, 246, 0.2);
  box-shadow: var(--shadow-card);
}

.hero-card-preview {
  font-family: 'Georgia', serif;
  font-size: 0.9rem;
  color: var(--text-2);
  line-height: 1.65;
  margin-bottom: 14px;
  padding: 14px;
  background: var(--bg-input);
  border-radius: var(--radius-md);
  border-left: 3px solid var(--color-primary);
}

.hero-card-preview em {
  color: var(--color-pink);
  font-style: normal;
}

.hero-card-choices {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.choice-btn {
  padding: 10px 14px;
  background: rgba(139, 92, 246, 0.1);
  border: 1px solid rgba(139, 92, 246, 0.3);
  border-radius: var(--radius-sm);
  color: var(--text-2);
  font-size: 0.85rem;
  text-align: left;
  cursor: default;
}

.choice-btn.highlight {
  border-color: var(--color-primary);
  color: var(--text-1);
  background: rgba(139, 92, 246, 0.2);
}

/* ========== Section common ========== */
section {
  padding: 80px 0;
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 48px;
}

.section-header h2 {
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  margin-bottom: 12px;
}

.section-header p {
  color: var(--text-2);
  font-size: 1.05rem;
}

.section-label {
  display: inline-block;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-primary-light);
  margin-bottom: 8px;
}

/* ========== Features ========== */
.features {
  background: var(--bg-1);
}

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

.feature-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 28px;
  border: 1px solid rgba(139, 92, 246, 0.12);
  transition: transform var(--transition), border-color var(--transition);
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: rgba(139, 92, 246, 0.35);
}

.feature-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  margin-bottom: 16px;
}

.feature-icon.purple { background: rgba(139, 92, 246, 0.2); color: var(--color-primary-light); }
.feature-icon.pink { background: rgba(244, 114, 182, 0.2); color: var(--color-pink); }
.feature-icon.gold { background: rgba(245, 200, 66, 0.2); color: var(--color-gold); }
.feature-icon.mint { background: rgba(94, 234, 212, 0.15); color: #5EEAD4; }
.feature-icon.orange { background: rgba(249, 115, 22, 0.2); color: var(--color-orange); }
.feature-icon.green { background: rgba(34, 197, 94, 0.2); color: var(--color-green); }

.feature-card h3 {
  font-size: 1.1rem;
  margin-bottom: 10px;
}

.feature-card p {
  color: var(--text-2);
  font-size: 0.9rem;
}

/* ========== Stats ========== */
.stats {
  background: var(--bg-banner);
  padding: 60px 0;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  text-align: center;
}

.stat-item .stat-number {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  background: var(--gradient-gold);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
}

.stat-item .stat-label {
  color: var(--text-2);
  font-size: 0.95rem;
  margin-top: 8px;
}

/* ========== Testimonials ========== */
.testimonials {
  background: var(--bg-2);
}

.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.testimonial-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 28px;
  border: 1px solid rgba(139, 92, 246, 0.12);
  position: relative;
}

.testimonial-card::before {
  content: '\201C';
  position: absolute;
  top: 12px;
  left: 20px;
  font-size: 4rem;
  color: var(--color-primary);
  opacity: 0.2;
  line-height: 1;
  font-family: Georgia, serif;
}

.testimonial-text {
  color: var(--text-2);
  font-size: 0.95rem;
  margin-bottom: 20px;
  padding-top: 24px;
  font-style: italic;
}

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

.author-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--text-1);
}

.author-avatar.a1 { background: var(--gradient-purple); }
.author-avatar.a2 { background: var(--gradient-mint); }
.author-avatar.a3 { background: var(--gradient-gold); }
.author-avatar.a4 { background: linear-gradient(135deg, #F472B6, #8B5CF6); }

.author-info strong {
  display: block;
  font-size: 0.95rem;
}

.author-info span {
  font-size: 0.8rem;
  color: var(--text-3);
}

/* ========== CTA ========== */
.cta-section {
  background: var(--hero-bg);
  text-align: center;
  padding: 100px 0;
}

.cta-section h2 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  margin-bottom: 16px;
}

.cta-section p {
  color: var(--text-2);
  font-size: 1.1rem;
  max-width: 560px;
  margin: 0 auto 32px;
}

/* ========== FAQ ========== */
.faq {
  background: var(--bg-1);
}

.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  border: 1px solid rgba(139, 92, 246, 0.12);
  overflow: hidden;
}

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 24px;
  background: none;
  border: none;
  color: var(--text-1);
  font-size: 1rem;
  font-weight: 600;
  text-align: left;
  cursor: pointer;
  font-family: inherit;
  transition: background var(--transition);
}

.faq-question:hover {
  background: rgba(139, 92, 246, 0.08);
}

.faq-question i {
  color: var(--color-primary-light);
  transition: transform var(--transition);
  flex-shrink: 0;
}

.faq-item.open .faq-question i {
  transform: rotate(180deg);
}

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

.faq-item.open .faq-answer {
  max-height: 400px;
}

.faq-answer-inner {
  padding: 0 24px 20px;
  color: var(--text-2);
  font-size: 0.95rem;
  line-height: 1.7;
}

/* ========== Footer ========== */
.site-footer {
  background: var(--bg-0);
  border-top: 1px solid rgba(139, 92, 246, 0.15);
  padding: 60px 0 32px;
}

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

.footer-brand .logo {
  margin-bottom: 12px;
}

.footer-brand p {
  color: var(--text-3);
  font-size: 0.9rem;
  max-width: 280px;
}

.footer-col h4 {
  font-size: 0.9rem;
  color: var(--text-1);
  margin-bottom: 16px;
}

.footer-col ul li {
  margin-bottom: 10px;
}

.footer-col a {
  color: var(--text-3);
  font-size: 0.875rem;
}

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

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding-top: 24px;
  border-top: 1px solid rgba(139, 92, 246, 0.1);
}

.footer-bottom p {
  color: var(--text-3);
  font-size: 0.85rem;
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
}

.footer-legal a {
  color: var(--text-3);
  font-size: 0.85rem;
}

/* Back to top */
.back-to-top {
  position: fixed;
  bottom: 28px;
  right: 28px;
  width: 48px;
  height: 48px;
  background: var(--gradient-purple);
  color: var(--text-1);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  font-size: 1.1rem;
  box-shadow: var(--shadow-card);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity var(--transition), transform var(--transition), visibility var(--transition);
  z-index: 999;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  box-shadow: 0 6px 28px rgba(139, 92, 246, 0.5);
}

/* ========== Responsive ========== */
@media (max-width: 1024px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .menu-toggle {
    display: block;
  }

  .nav-main {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    background: rgba(15, 11, 34, 0.98);
    flex-direction: column;
    padding: 20px;
    gap: 4px;
    border-bottom: 1px solid rgba(139, 92, 246, 0.15);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: transform var(--transition), opacity var(--transition), visibility var(--transition);
  }

  .nav-main.open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .nav-main a {
    width: 100%;
    padding: 12px 16px;
  }

  .header-actions .btn-primary {
    display: none;
  }

  .hero {
    padding: calc(var(--header-h) + 16px) 0 28px;
  }

  .hero-grid {
    grid-template-columns: 1fr;
    gap: 0;
    text-align: center;
  }

  .hero-badge {
    margin-bottom: 10px;
  }

  .hero h1 {
    margin-bottom: 8px;
  }

  .hero-subtitle {
    margin-bottom: 12px;
    font-size: 0.95rem;
  }

  .hero-tags {
    margin-bottom: 14px;
    justify-content: center;
  }

  .hero-subtitle,
  .hero-tags,
  .hero-actions {
    justify-content: center;
    margin-left: auto;
    margin-right: auto;
  }

  .hero-visual {
    display: none;
  }

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

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