/* =====================
   花叔 Design - 深色科技风
   ===================== */

/* --- Variables --- */
:root {
  --bg-deep: #07060b;
  --bg-surface: #0d0c14;
  --bg-card: rgba(255, 255, 255, 0.04);
  --bg-card-hover: rgba(255, 255, 255, 0.07);
  --bg-glass: rgba(255, 255, 255, 0.03);
  --border-glass: rgba(255, 255, 255, 0.08);
  --border-glow: rgba(71, 119, 255, 0.15);

  --gradient-primary: linear-gradient(135deg, #4777ff 0%, #8b5cf6 100%);
  --gradient-accent: linear-gradient(135deg, #8b5cf6 0%, #f472b6 100%);
  --gradient-hero: linear-gradient(135deg, #4777ff, #8b5cf6, #f472b6);
  --gradient-text: linear-gradient(135deg, #ffffff 0%, #a5b4fc 50%, #8b5cf6 100%);
  --gradient-orb-1: radial-gradient(circle at 30% 50%, rgba(71, 119, 255, 0.15) 0%, transparent 60%);
  --gradient-orb-2: radial-gradient(circle at 70% 50%, rgba(139, 92, 246, 0.12) 0%, transparent 60%);
  --gradient-orb-3: radial-gradient(circle at 50% 0%, rgba(244, 114, 182, 0.08) 0%, transparent 50%);

  --text-primary: #f0f0f8;
  --text-secondary: #9494b8;
  --text-muted: #5c5c7a;

  --shadow-glass: 0 8px 32px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 60px rgba(71, 119, 255, 0.06);

  --radius-sm: 8px;
  --radius: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;

  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  --max-width: 1200px;

  --transition: 0.4s cubic-bezier(0.22, 1, 0.36, 1);
  --transition-slow: 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  background: var(--bg-deep);
}

body {
  font-family: var(--font-sans);
  background: var(--bg-deep);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a { color: #8b5cf6; text-decoration: none; transition: color var(--transition); }
a:hover { color: #a78bfa; }

img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }

/* --- Background Orbs (decorative) --- */
.orb {
  position: fixed;
  border-radius: 50%;
  pointer-events: none;
  z-index: 0;
  filter: blur(80px);
  opacity: 0.6;
  animation: orbFloat 20s ease-in-out infinite;
}

.orb-1 {
  width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(71, 119, 255, 0.12), transparent);
  top: -200px; left: -200px;
  animation-delay: 0s;
}

.orb-2 {
  width: 500px; height: 500px;
  background: radial-gradient(circle, rgba(139, 92, 246, 0.10), transparent);
  bottom: -150px; right: -150px;
  animation-delay: -7s;
}

.orb-3 {
  width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(244, 114, 182, 0.08), transparent);
  top: 50%; left: 50%;
  animation-delay: -14s;
}

@keyframes orbFloat {
  0%, 100% { transform: translate(0, 0) scale(1); }
  25% { transform: translate(60px, -40px) scale(1.05); }
  50% { transform: translate(-30px, 60px) scale(0.95); }
  75% { transform: translate(40px, 30px) scale(1.02); }
}

/* --- Glass Grid Overlay --- */
.grid-overlay {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  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;
}

/* --- Navbar --- */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: rgba(7, 6, 11, 0.72);
  backdrop-filter: blur(24px) saturate(1.4);
  -webkit-backdrop-filter: blur(24px) saturate(1.4);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  transition: var(--transition);
}

.navbar-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 28px;
  height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.navbar-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  color: var(--text-primary);
}
.navbar-logo:hover { color: var(--text-primary); }
.navbar-logo img { width: 30px; height: 30px; }
.navbar-logo span {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.navbar-links {
  display: flex;
  align-items: center;
  gap: 36px;
}

.navbar-links a {
  color: var(--text-secondary);
  font-size: 0.88rem;
  font-weight: 500;
  position: relative;
  padding: 4px 0;
  transition: color var(--transition);
}
.navbar-links a::after {
  content: '';
  position: absolute;
  bottom: -2px; left: 0;
  width: 0; height: 2px;
  background: var(--gradient-primary);
  border-radius: 2px;
  transition: width var(--transition);
}
.navbar-links a:hover { color: var(--text-primary); }
.navbar-links a:hover::after { width: 100%; }
.navbar-links a.active {
  color: #a78bfa;
}

#lang-toggle {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  color: var(--text-secondary);
  padding: 6px 16px;
  border-radius: 20px;
  cursor: pointer;
  font-size: 0.82rem;
  font-family: var(--font-sans);
  transition: all var(--transition);
  letter-spacing: 0.3px;
}
#lang-toggle:hover {
  border-color: rgba(139, 92, 246, 0.4);
  color: #c4b5fd;
  background: rgba(139, 92, 246, 0.08);
}

/* --- Hamburger --- */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
  background: none;
  border: none;
}
.hamburger span {
  display: block;
  width: 22px; height: 2px;
  background: var(--text-secondary);
  border-radius: 2px;
  transition: all var(--transition);
}

/* ============================================
   Full-Screen Sections
   ============================================ */
.full-section {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  padding: 100px 28px;
}

.section-content {
  max-width: var(--max-width);
  width: 100%;
  position: relative;
  z-index: 1;
}

/* ============================================
   Hero
   ============================================ */
#hero {
  text-align: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 20px;
  border-radius: 50px;
  background: rgba(139, 92, 246, 0.08);
  border: 1px solid rgba(139, 92, 246, 0.15);
  color: #a78bfa;
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 28px;
  letter-spacing: 0.5px;
}

.hero-title {
  font-size: clamp(3.5rem, 10vw, 7rem);
  font-weight: 800;
  line-height: 1.05;
  margin-bottom: 20px;
  letter-spacing: -2px;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: clamp(1rem, 2vw, 1.3rem);
  color: var(--text-secondary);
  margin-bottom: 12px;
  font-weight: 500;
  letter-spacing: 2px;
  text-transform: uppercase;
}

.hero-desc {
  font-size: clamp(0.95rem, 1.4vw, 1.1rem);
  color: var(--text-muted);
  max-width: 620px;
  margin: 0 auto 44px;
  line-height: 1.8;
}

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

.hero-scroll-hint {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--text-muted);
  font-size: 0.75rem;
  letter-spacing: 1px;
  animation: scrollBounce 2s ease-in-out infinite;
}

@keyframes scrollBounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(8px); }
}

.hero-scroll-hint .arrow {
  width: 20px; height: 20px;
  border-right: 1.5px solid var(--text-muted);
  border-bottom: 1.5px solid var(--text-muted);
  transform: rotate(45deg);
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 34px;
  border-radius: 50px;
  font-size: 0.95rem;
  font-weight: 600;
  font-family: var(--font-sans);
  cursor: pointer;
  transition: all var(--transition);
  border: none;
  text-decoration: none;
  letter-spacing: 0.3px;
}

.btn-primary {
  background: var(--gradient-primary);
  color: #fff;
  box-shadow: 0 4px 24px rgba(71, 119, 255, 0.25);
}
.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 40px rgba(71, 119, 255, 0.35);
  color: #fff;
}

.btn-secondary {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.1);
  color: var(--text-primary);
}
.btn-secondary:hover {
  border-color: rgba(139, 92, 246, 0.3);
  color: #c4b5fd;
  background: rgba(139, 92, 246, 0.06);
  transform: translateY(-3px);
}

.btn-glow {
  background: var(--gradient-accent);
  color: #fff;
  box-shadow: 0 4px 24px rgba(139, 92, 246, 0.25);
}
.btn-glow:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 40px rgba(244, 114, 182, 0.3);
  color: #fff;
}

/* ============================================
   Section Headers
   ============================================ */
.section-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: #a78bfa;
  margin-bottom: 16px;
}
.section-label::before,
.section-label::after {
  content: '';
  width: 24px; height: 1px;
  background: rgba(139, 92, 246, 0.3);
}

.section-title {
  font-size: clamp(2rem, 4vw, 3.2rem);
  font-weight: 700;
  margin-bottom: 16px;
  line-height: 1.2;
  letter-spacing: -0.5px;
}

.section-desc {
  color: var(--text-secondary);
  font-size: 1.05rem;
  max-width: 560px;
  line-height: 1.7;
}

.section-header {
  text-align: center;
  margin-bottom: 64px;
}
.section-header .section-desc {
  margin: 0 auto;
}

/* ============================================
   Glass Card
   ============================================ */
.glass-card {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.glass-card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(135deg, rgba(71,119,255,0.05), transparent 50%);
  opacity: 0;
  transition: opacity var(--transition);
  pointer-events: none;
}

.glass-card:hover {
  border-color: var(--border-glow);
  transform: translateY(-6px);
  box-shadow: var(--shadow-glow);
  background: var(--bg-card-hover);
}
.glass-card:hover::before {
  opacity: 1;
}

/* ============================================
   Features Grid
   ============================================ */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 20px;
}

.feature-card {
  padding: 36px 32px;
}

.feature-icon {
  width: 52px; height: 52px;
  border-radius: 14px;
  background: rgba(139, 92, 246, 0.08);
  border: 1px solid rgba(139, 92, 246, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  font-size: 1.5rem;
}

.feature-card h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 12px;
  letter-spacing: 0.3px;
}

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

/* ============================================
   Scenarios
   ============================================ */
.scenarios-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
}

.scenario-card {
  padding: 32px 24px;
  text-align: center;
}

.scenario-icon {
  font-size: 2.5rem;
  margin-bottom: 16px;
  display: block;
}

.scenario-card h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.scenario-card p {
  color: var(--text-secondary);
  font-size: 0.85rem;
  line-height: 1.6;
}

/* ============================================
   CTA Section
   ============================================ */
#cta-section {
  position: relative;
  text-align: center;
}

.cta-box {
  background: var(--gradient-primary);
  border-radius: var(--radius-xl);
  padding: 80px 48px;
  position: relative;
  overflow: hidden;
}

.cta-box::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(255,255,255,0.12) 0%, transparent 60%),
    radial-gradient(ellipse at 80% 50%, rgba(244,114,182,0.15) 0%, transparent 60%);
  pointer-events: none;
}

.cta-box h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 700;
  color: #fff;
  margin-bottom: 12px;
  position: relative;
}

.cta-box p {
  color: rgba(255,255,255,0.75);
  font-size: 1.05rem;
  margin-bottom: 32px;
  position: relative;
}

.cta-box .btn {
  background: #fff;
  color: #4777ff;
  box-shadow: 0 4px 24px rgba(0,0,0,0.15);
  position: relative;
}
.cta-box .btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 40px rgba(0,0,0,0.2);
}

/* ============================================
   Footer
   ============================================ */
.footer {
  border-top: 1px solid rgba(255,255,255,0.04);
  padding: 40px 28px;
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.footer p { color: var(--text-muted); font-size: 0.82rem; }
.footer-links { display: flex; gap: 28px; }
.footer-links a { color: var(--text-muted); font-size: 0.82rem; }
.footer-links a:hover { color: var(--text-secondary); }

/* ============================================
   Features Detail Page
   ============================================ */
.feature-detail {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
  padding: 80px 28px;
  max-width: var(--max-width);
  margin: 0 auto;
}

.feature-detail.reverse {
  direction: rtl;
}
.feature-detail.reverse > * { direction: ltr; }

.feature-detail-text h2 {
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 16px;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.feature-detail-text p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.8;
  margin-bottom: 12px;
}

.feature-detail-image {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border-glass);
  box-shadow: var(--shadow-glass), var(--shadow-glow);
  background: var(--bg-card);
}

.feature-detail-image img { width: 100%; display: block; }

/* ============================================
   Download Page
   ============================================ */
.download-header {
  text-align: center;
  padding: 140px 28px 40px;
}

.download-header .hero-desc { margin: 0 auto; }

.download-options {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  max-width: 800px;
  margin: 40px auto;
  padding: 0 28px;
}

.download-card {
  padding: 44px 36px;
  text-align: center;
}

.download-card .btn { margin-top: 20px; }
.download-card h3 { font-size: 1.3rem; font-weight: 600; margin-bottom: 12px; }
.download-card p { color: var(--text-secondary); font-size: 0.9rem; line-height: 1.7; }

.version-info {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.88rem;
  margin-bottom: 24px;
}

.requirements-box {
  max-width: 600px;
  margin: 48px auto;
  padding: 36px 32px;
}
.requirements-box h3 { font-size: 1.1rem; font-weight: 600; margin-bottom: 16px; text-align: center; }
.requirements-box ul { list-style: none; }
.requirements-box li {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 10px;
  line-height: 1.6;
  padding-left: 20px;
  position: relative;
}
.requirements-box li::before {
  content: '✦';
  position: absolute;
  left: 0;
  color: #a78bfa;
  font-size: 0.7rem;
}

.changelog-box {
  max-width: 600px;
  margin: 48px auto 80px;
  padding: 36px 32px;
}
.changelog-box h3 { font-size: 1.1rem; font-weight: 600; margin-bottom: 16px; text-align: center; }
.changelog-item {
  color: var(--text-secondary);
  font-size: 0.9rem;
  padding: 12px 0;
  border-bottom: 1px solid rgba(255,255,255,0.04);
  line-height: 1.6;
}
.changelog-item:last-child { border-bottom: none; }

/* ============================================
   Docs Page
   ============================================ */
.docs-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  max-width: 900px;
  margin: 40px auto;
  padding: 0 28px;
}

.docs-card {
  padding: 36px 32px;
  display: block;
  color: inherit;
  text-decoration: none;
  cursor: pointer;
}

.docs-card h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.docs-card p { color: var(--text-secondary); font-size: 0.9rem; line-height: 1.7; }
.docs-card.full { grid-column: 1 / -1; }

.quickstart-steps {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-top: 20px;
}

.step { display: flex; gap: 16px; align-items: flex-start; }
.step-number {
  width: 36px; height: 36px;
  border-radius: 50%;
  background: var(--gradient-primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  font-weight: 700;
  flex-shrink: 0;
}
.step h4 { font-size: 0.95rem; font-weight: 600; margin-bottom: 4px; }
.step p { color: var(--text-secondary); font-size: 0.85rem; line-height: 1.6; }

.faq-item {
  padding: 16px 0;
  border-bottom: 1px solid rgba(255,255,255,0.04);
}
.faq-item:last-child { border-bottom: none; }
.faq-question { font-weight: 600; font-size: 0.95rem; margin-bottom: 8px; }
.faq-answer { color: var(--text-secondary); font-size: 0.9rem; line-height: 1.7; }

/* ============================================
   Animations (Scroll Reveal)
   ============================================ */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}
.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }
.reveal-delay-5 { transition-delay: 0.5s; }

/* Stagger children */
.stagger-children > .stagger-item:nth-child(1) { transition-delay: 0.05s; }
.stagger-children > .stagger-item:nth-child(2) { transition-delay: 0.1s; }
.stagger-children > .stagger-item:nth-child(3) { transition-delay: 0.15s; }
.stagger-children > .stagger-item:nth-child(4) { transition-delay: 0.2s; }
.stagger-children > .stagger-item:nth-child(5) { transition-delay: 0.25s; }
.stagger-children > .stagger-item:nth-child(6) { transition-delay: 0.3s; }
.stagger-children > .stagger-item:nth-child(7) { transition-delay: 0.35s; }
.stagger-children > .stagger-item:nth-child(8) { transition-delay: 0.4s; }
.stagger-children > .stagger-item:nth-child(9) { transition-delay: 0.45s; }
.stagger-children > .stagger-item:nth-child(10) { transition-delay: 0.5s; }

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 768px) {
  .navbar-links {
    position: fixed;
    top: 68px; left: 0; right: 0;
    background: rgba(7, 6, 11, 0.98);
    backdrop-filter: blur(24px);
    flex-direction: column;
    padding: 28px;
    gap: 24px;
    border-bottom: 1px solid rgba(255,255,255,0.05);
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: all var(--transition);
  }
  .navbar-links.open { transform: translateY(0); opacity: 1; pointer-events: auto; }
  .hamburger { display: flex; }

  .features-grid { grid-template-columns: 1fr; }
  .scenarios-grid { grid-template-columns: 1fr 1fr; }
  .feature-detail { grid-template-columns: 1fr; gap: 24px; padding: 48px 28px; }
  .feature-detail.reverse { direction: ltr; }
  .download-options { grid-template-columns: 1fr; }
  .docs-grid { grid-template-columns: 1fr; }
  .quickstart-steps { grid-template-columns: 1fr; }

  .cta-box { padding: 48px 28px; margin: 0 16px; border-radius: var(--radius-lg); }
  .footer { flex-direction: column; text-align: center; }
  .full-section { min-height: auto; padding: 80px 20px; }
}

@media (max-width: 480px) {
  .scenarios-grid { grid-template-columns: 1fr; }
  .hero-title { letter-spacing: -1px; }
  .btn { padding: 12px 26px; font-size: 0.88rem; }
}

/* --- Scrollbar --- */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-deep); }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.08); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.15); }