/* ===== 变量与重置 ===== */
:root {
  --bg-primary: #0a0e17;
  --bg-secondary: #111827;
  --bg-card: #1a2235;
  --bg-card-hover: #1f2a40;
  --accent: #00e676;
  --accent-dim: #00c853;
  --accent-glow: rgba(0, 230, 118, 0.25);
  --purple: #7c4dff;
  --purple-glow: rgba(124, 77, 255, 0.3);
  --cyan: #00bcd4;
  --text-primary: #f0f4f8;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --border: rgba(255, 255, 255, 0.08);
  --gradient: linear-gradient(135deg, #00e676 0%, #00bcd4 50%, #7c4dff 100%);
  --radius: 12px;
  --radius-lg: 20px;
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

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

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

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 50px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: var(--transition);
  white-space: nowrap;
}

.btn-primary {
  background: var(--gradient);
  color: #0a0e17;
  box-shadow: 0 4px 20px var(--accent-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px var(--accent-glow);
}

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

.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.btn-lg {
  padding: 16px 36px;
  font-size: 16px;
}

/* ===== 头部导航 ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(10, 14, 23, 0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
}

.header.scrolled {
  background: rgba(10, 14, 23, 0.95);
  box-shadow: var(--shadow);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 18px;
  font-weight: 700;
}

.logo img {
  border-radius: 8px;
}

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

.nav a {
  font-size: 14px;
  color: var(--text-secondary);
  transition: var(--transition);
  position: relative;
}

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

.nav a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: var(--transition);
}

.nav a:hover::after {
  width: 100%;
}

.nav-cta {
  background: var(--gradient) !important;
  color: #0a0e17 !important;
  padding: 8px 20px !important;
  border-radius: 50px;
  font-weight: 600 !important;
}

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

.nav-cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 15px var(--accent-glow);
}

.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  transition: var(--transition);
}

/* ===== Hero ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 120px 0 80px;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 20% 50%, rgba(0, 230, 118, 0.08) 0%, transparent 60%),
    radial-gradient(ellipse 60% 50% at 80% 30%, rgba(124, 77, 255, 0.1) 0%, transparent 60%),
    radial-gradient(ellipse 50% 40% at 50% 80%, rgba(0, 188, 212, 0.06) 0%, transparent 60%);
  pointer-events: none;
}

.hero-bg::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.02'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.hero-inner {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
}

.hero-content {
  flex: 1;
  max-width: 600px;
}

.hero-badge {
  display: inline-block;
  padding: 6px 16px;
  background: rgba(0, 230, 118, 0.1);
  border: 1px solid rgba(0, 230, 118, 0.3);
  border-radius: 50px;
  font-size: 13px;
  color: var(--accent);
  margin-bottom: 24px;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}

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

.hero-desc {
  font-size: 16px;
  color: var(--text-secondary);
  margin-bottom: 32px;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}

.hero-stats {
  display: flex;
  gap: 40px;
  flex-wrap: wrap;
}

.stat-item strong {
  display: block;
  font-size: 28px;
  font-weight: 800;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-item span {
  font-size: 13px;
  color: var(--text-muted);
}

/* 手机模拟器 */
.hero-visual {
  position: relative;
  z-index: 2;
  flex: 0 0 340px;
  display: flex;
  justify-content: center;
  margin-left: 40px;
}

.phone-mockup {
  width: 280px;
  background: linear-gradient(145deg, #1a2235, #0f1520);
  border-radius: 32px;
  padding: 12px;
  box-shadow:
    0 0 0 2px rgba(255, 255, 255, 0.05),
    0 20px 60px rgba(0, 0, 0, 0.5),
    0 0 80px var(--accent-glow);
  animation: float 6s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}

.phone-screen {
  background: #0d1117;
  border-radius: 24px;
  padding: 24px 20px;
  min-height: 400px;
}

.screen-header {
  text-align: center;
  font-size: 14px;
  font-weight: 600;
  color: var(--accent);
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 20px;
}

.screen-features {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 24px;
}

.screen-feat {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  background: rgba(255, 255, 255, 0.03);
  border-radius: 10px;
  font-size: 13px;
  color: var(--text-secondary);
  border: 1px solid transparent;
  transition: var(--transition);
}

.screen-feat.active {
  border-color: rgba(0, 230, 118, 0.2);
  background: rgba(0, 230, 118, 0.05);
  color: var(--text-primary);
}

.dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.dot.green {
  background: var(--accent);
  box-shadow: 0 0 8px var(--accent-glow);
}

.dot.yellow {
  background: #ffc107;
  box-shadow: 0 0 8px rgba(255, 193, 7, 0.4);
}

.screen-status {
  text-align: center;
  font-size: 12px;
  color: var(--accent);
  padding: 12px;
  background: rgba(0, 230, 118, 0.08);
  border-radius: 8px;
  border: 1px solid rgba(0, 230, 118, 0.15);
}

/* ===== 通用 Section ===== */
.section {
  padding: 100px 0;
  position: relative;
}

.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-tag {
  display: inline-block;
  padding: 4px 14px;
  background: rgba(124, 77, 255, 0.1);
  border: 1px solid rgba(124, 77, 255, 0.25);
  border-radius: 50px;
  font-size: 12px;
  color: var(--purple);
  font-weight: 600;
  letter-spacing: 0.05em;
  margin-bottom: 16px;
}

.section-header h2 {
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  font-weight: 800;
  margin-bottom: 12px;
}

.section-header p {
  color: var(--text-secondary);
  font-size: 16px;
  max-width: 500px;
  margin: 0 auto;
}

/* ===== 功能卡片 ===== */
.features {
  background: var(--bg-secondary);
}

.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-lg);
  padding: 32px 28px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient);
  opacity: 0;
  transition: var(--transition);
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: rgba(0, 230, 118, 0.2);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}

.feature-card:hover::before {
  opacity: 1;
}

.feature-icon {
  font-size: 36px;
  margin-bottom: 16px;
}

.feature-card h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 10px;
}

.feature-card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ===== 优势列表 ===== */
.advantages-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.advantage-item {
  display: flex;
  gap: 20px;
  padding: 28px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: var(--transition);
}

.advantage-item:hover {
  border-color: rgba(124, 77, 255, 0.3);
  background: var(--bg-card-hover);
}

.advantage-num {
  font-size: 32px;
  font-weight: 900;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  flex-shrink: 0;
  line-height: 1;
}

.advantage-content h3 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 8px;
}

.advantage-content p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ===== 教程步骤 ===== */
.tutorial {
  background: var(--bg-secondary);
}

.steps {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  gap: 16px;
}

.step {
  flex: 1;
  max-width: 280px;
  text-align: center;
  padding: 32px 24px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}

.step-circle {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--gradient);
  color: #0a0e17;
  font-size: 24px;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
}

.step h3 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 10px;
}

.step p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}

.step-arrow {
  font-size: 28px;
  color: var(--text-muted);
  align-self: center;
  padding-top: 40px;
}

/* ===== 评价 ===== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: var(--transition);
}

.review-card:hover {
  border-color: rgba(0, 230, 118, 0.2);
}

.stars {
  color: #ffc107;
  font-size: 16px;
  margin-bottom: 12px;
  letter-spacing: 2px;
}

.review-card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 16px;
  font-style: italic;
}

.review-card footer {
  font-size: 13px;
  color: var(--text-muted);
}

/* ===== 下载区 ===== */
.download {
  background: var(--bg-secondary);
}

.download-box {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
  padding: 48px;
  background: linear-gradient(135deg, rgba(0, 230, 118, 0.08), rgba(124, 77, 255, 0.08));
  border: 1px solid rgba(0, 230, 118, 0.15);
  border-radius: var(--radius-lg);
  position: relative;
  overflow: hidden;
}

.download-box::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, var(--accent-glow), transparent 70%);
  pointer-events: none;
}

.download-info {
  position: relative;
  z-index: 1;
}

.download-info h2 {
  font-size: 28px;
  font-weight: 800;
  margin-bottom: 8px;
}

.download-info > p {
  color: var(--text-secondary);
  font-size: 14px;
  margin-bottom: 20px;
}

.download-features {
  list-style: none;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.download-features li {
  font-size: 14px;
  color: var(--accent);
}

.download-buttons {
  display: flex;
  flex-direction: column;
  gap: 12px;
  position: relative;
  z-index: 1;
  flex-shrink: 0;
}

/* ===== 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;
  transition: var(--transition);
}

.faq-item[open] {
  border-color: rgba(0, 230, 118, 0.2);
}

.faq-item summary {
  padding: 20px 24px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: var(--transition);
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: '+';
  font-size: 20px;
  color: var(--accent);
  transition: var(--transition);
  flex-shrink: 0;
  margin-left: 16px;
}

.faq-item[open] summary::after {
  content: '−';
}

.faq-item summary:hover {
  color: var(--accent);
}

.faq-answer {
  padding: 0 24px 20px;
}

.faq-answer p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.8;
}

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

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

.footer-brand p {
  font-size: 14px;
  color: var(--text-secondary);
  margin-top: 16px;
  line-height: 1.7;
}

.footer-links h4,
.footer-contact h4 {
  font-size: 14px;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.footer-links a {
  display: block;
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 10px;
  transition: var(--transition);
}

.footer-links a:hover {
  color: var(--accent);
}

.footer-contact p {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 24px;
  text-align: center;
}

.footer-bottom p {
  font-size: 13px;
  color: var(--text-muted);
}

.footer-disclaimer {
  margin-top: 8px;
  font-size: 12px !important;
}

/* ===== 返回顶部 ===== */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 44px;
  height: 44px;
  background: var(--gradient);
  color: #0a0e17;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 700;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  z-index: 999;
  box-shadow: 0 4px 15px var(--accent-glow);
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  transform: translateY(-3px);
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .hero {
    padding-top: 100px;
  }

  .hero-inner {
    flex-direction: column;
    text-align: center;
  }

  .hero-content {
    max-width: 100%;
  }

  .hero-actions {
    justify-content: center;
  }

  .hero-stats {
    justify-content: center;
  }

  .hero-visual {
    margin-left: 0;
    margin-top: 48px;
    flex: none;
  }

  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

@media (max-width: 768px) {
  .nav {
    display: none;
    position: absolute;
    top: 70px;
    left: 0;
    right: 0;
    background: rgba(10, 14, 23, 0.98);
    flex-direction: column;
    padding: 20px;
    gap: 16px;
    border-bottom: 1px solid var(--border);
  }

  .nav.open {
    display: flex;
  }

  .menu-toggle {
    display: flex;
  }

  .features-grid,
  .advantages-list,
  .reviews-grid {
    grid-template-columns: 1fr;
  }

  .steps {
    flex-direction: column;
    align-items: center;
  }

  .step-arrow {
    transform: rotate(90deg);
    padding: 0;
  }

  .download-box {
    flex-direction: column;
    text-align: center;
    padding: 32px 24px;
  }

  .download-features {
    grid-template-columns: 1fr;
  }

  .download-buttons {
    width: 100%;
  }

  .download-buttons .btn {
    width: 100%;
    justify-content: center;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .section {
    padding: 60px 0;
  }
}