:root {
  --primary: #6c5ce7;
  --primary-dark: #5a4bd1;
  --accent: #fd79a8;
  --accent-light: #ffeaa7;
  --bg: #0f0f1a;
  --bg-card: #1a1a2e;
  --bg-card-hover: #222240;
  --text: #e8e8f0;
  --text-muted: #9898b0;
  --border: rgba(255, 255, 255, 0.08);
  --gradient: linear-gradient(135deg, #6c5ce7 0%, #fd79a8 100%);
  --shadow: 0 8px 32px rgba(108, 92, 231, 0.25);
  --radius: 16px;
  --nav-height: 64px;
  --float-bar-height: 72px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  font-size: 16px;
  padding-bottom: var(--float-bar-height);
}

a { color: var(--accent); text-decoration: none; transition: opacity 0.2s; }
a:hover { opacity: 0.85; }

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

.container { max-width: 1100px; margin: 0 auto; padding: 0 20px; }

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(15, 15, 26, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  height: var(--nav-height);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
}

.logo-icon {
  width: 36px;
  height: 36px;
  background: var(--gradient);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
}

.nav-links { display: flex; gap: 24px; list-style: none; }
.nav-links a { color: var(--text-muted); font-size: 0.95rem; }
.nav-links a:hover, .nav-links a.active { color: var(--text); }

/* Hero */
.hero {
  padding: 60px 0 80px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(108, 92, 231, 0.15) 0%, transparent 70%);
  pointer-events: none;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.hero-badge {
  display: inline-block;
  background: rgba(108, 92, 231, 0.2);
  color: var(--accent-light);
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 0.85rem;
  margin-bottom: 16px;
  border: 1px solid rgba(108, 92, 231, 0.3);
}

.hero h1 {
  font-size: 2.5rem;
  line-height: 1.25;
  margin-bottom: 16px;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  color: var(--text-muted);
  font-size: 1.05rem;
  margin-bottom: 28px;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  margin-bottom: 28px;
}

.meta-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.meta-item strong { color: var(--text); }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: 12px;
  font-size: 1rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
  text-decoration: none;
}

.btn-primary {
  background: var(--gradient);
  color: #fff;
  box-shadow: var(--shadow);
}

.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 40px rgba(108, 92, 231, 0.35); opacity: 1; }

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

.btn-outline:hover { background: var(--bg-card); opacity: 1; }

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

.hero-visual {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 32px;
  border: 1px solid var(--border);
  text-align: center;
}

.app-preview {
  width: 200px;
  height: 360px;
  margin: 0 auto 20px;
  background: linear-gradient(180deg, #2d2d4a 0%, #1a1a2e 100%);
  border-radius: 24px;
  border: 3px solid rgba(255,255,255,0.1);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.4);
}

.app-preview-icon { font-size: 64px; }
.app-preview-text { font-size: 0.85rem; color: var(--text-muted); }

/* Sections */
.section { padding: 60px 0; }
.section-alt { background: rgba(26, 26, 46, 0.5); }

.section-header { text-align: center; margin-bottom: 48px; }
.section-header h2 { font-size: 2rem; margin-bottom: 12px; }
.section-header p { color: var(--text-muted); max-width: 600px; margin: 0 auto; }

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

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: transform 0.2s, border-color 0.2s;
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: rgba(108, 92, 231, 0.3);
}

.feature-icon {
  width: 48px;
  height: 48px;
  background: rgba(108, 92, 231, 0.15);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  margin-bottom: 16px;
}

.feature-card h3 { font-size: 1.1rem; margin-bottom: 8px; }
.feature-card p { color: var(--text-muted); font-size: 0.95rem; }

/* Content blocks */
.content-block {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  margin-bottom: 24px;
}

.content-block h2, .content-block h3 { margin-bottom: 16px; }
.content-block p { color: var(--text-muted); margin-bottom: 12px; }
.content-block ul, .content-block ol { color: var(--text-muted); padding-left: 24px; margin-bottom: 16px; }
.content-block li { margin-bottom: 8px; }

/* Steps */
.steps { counter-reset: step; }
.step-item {
  display: flex;
  gap: 20px;
  margin-bottom: 28px;
  align-items: flex-start;
}

.step-num {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  background: var(--gradient);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.1rem;
}

.step-content h3 { margin-bottom: 8px; }
.step-content p { color: var(--text-muted); }

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

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
}

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

.faq-question::after { content: "+"; font-size: 1.4rem; color: var(--text-muted); transition: transform 0.2s; }
.faq-item.open .faq-question::after { transform: rotate(45deg); }

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}

.faq-item.open .faq-answer { max-height: 500px; }
.faq-answer-inner { padding: 0 24px 20px; color: var(--text-muted); }

/* Tags */
.tag-cloud { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 20px; }
.tag {
  background: rgba(108, 92, 231, 0.12);
  color: var(--accent-light);
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 0.85rem;
  border: 1px solid rgba(108, 92, 231, 0.2);
}

/* Footer */
.site-footer {
  background: var(--bg-card);
  border-top: 1px solid var(--border);
  padding: 40px 0 24px;
  margin-top: 40px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 32px;
}

.footer-brand p { color: var(--text-muted); font-size: 0.9rem; margin-top: 12px; }
.footer-links h4 { margin-bottom: 16px; font-size: 0.95rem; }
.footer-links ul { list-style: none; }
.footer-links li { margin-bottom: 8px; }
.footer-links a { color: var(--text-muted); font-size: 0.9rem; }

.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 20px;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* Floating download bar */
.float-download-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 200;
  background: rgba(26, 26, 46, 0.96);
  backdrop-filter: blur(16px);
  border-top: 1px solid var(--border);
  padding: 12px 20px;
  transform: translateY(100%);
  transition: transform 0.35s ease;
  box-shadow: 0 -4px 24px rgba(0, 0, 0, 0.3);
}

.float-download-bar.visible { transform: translateY(0); }

.float-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.float-info { display: flex; align-items: center; gap: 12px; }
.float-icon {
  width: 44px;
  height: 44px;
  background: var(--gradient);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
}

.float-text h4 { font-size: 0.95rem; margin-bottom: 2px; }
.float-text p { font-size: 0.8rem; color: var(--text-muted); }

.float-actions { display: flex; gap: 10px; }

.btn-sm { padding: 10px 20px; font-size: 0.9rem; border-radius: 10px; }

/* Download modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  z-index: 300;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s, visibility 0.3s;
}

.modal-overlay.active { opacity: 1; visibility: visible; }

.modal-box {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  max-width: 420px;
  width: 100%;
  transform: scale(0.9);
  transition: transform 0.3s;
}

.modal-overlay.active .modal-box { transform: scale(1); }

.modal-box h3 { font-size: 1.3rem; margin-bottom: 8px; text-align: center; }
.modal-box > p { color: var(--text-muted); text-align: center; margin-bottom: 24px; font-size: 0.9rem; }

.download-options { display: flex; flex-direction: column; gap: 12px; }

.download-option {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 20px;
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--border);
  border-radius: 12px;
  color: var(--text);
  text-decoration: none;
  transition: background 0.2s, border-color 0.2s;
}

.download-option:hover {
  background: rgba(108, 92, 231, 0.1);
  border-color: rgba(108, 92, 231, 0.3);
  opacity: 1;
}

.download-option-icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  font-weight: 700;
}

.download-option-icon.baidu { background: #2932e1; color: #fff; }
.download-option-icon.quark { background: #0066ff; color: #fff; }

.download-option-text h4 { font-size: 1rem; margin-bottom: 2px; }
.download-option-text p { font-size: 0.8rem; color: var(--text-muted); }

.modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.5rem;
  cursor: pointer;
  line-height: 1;
}

.modal-box { position: relative; }

.modal-tip {
  margin-top: 16px;
  padding: 12px;
  background: rgba(255, 234, 167, 0.08);
  border-radius: 8px;
  font-size: 0.8rem;
  color: var(--accent-light);
  text-align: center;
}

/* Breadcrumb */
.breadcrumb {
  padding: 16px 0;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.breadcrumb a { color: var(--text-muted); }
.breadcrumb span { margin: 0 8px; }

/* Responsive */
@media (max-width: 768px) {
  .hero-grid { grid-template-columns: 1fr; gap: 32px; }
  .hero h1 { font-size: 1.8rem; }
  .features-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
  .nav-links { display: none; }
  .float-info { display: none; }
  .float-inner { justify-content: center; }
  .float-actions { width: 100%; }
  .float-actions .btn { flex: 1; justify-content: center; }
}