/* ==================== CSS变量/主题 ==================== */
:root {
  /* 主色调 - 红色渐变 */
  --primary: #ef4444;
  --primary-dark: #dc2626;
  --primary-light: #f87171;
  --accent: #f97316;
  --secondary: #eab308;
  --warning: #f59e0b;

  /* 渐变 */
  --gradient-primary: linear-gradient(135deg, #ef4444 0%, #f97316 100%);
  --gradient-accent: linear-gradient(135deg, #ef4444 0%, #eab308 100%);
  --gradient-success: linear-gradient(135deg, #f97316 0%, #eab308 100%);

  /* 背景 */
  --bg-white: #ffffff;
  --bg-gray: #f8fafc;
  --bg-dark: #0f172a;
  --bg-dark-2: #1e293b;

  /* 文字 */
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --text-light: #e2e8f0;

  /* 边框/阴影 */
  --border: #e2e8f0;
  --border-light: #f1f5f9;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
  --shadow-md: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
  --shadow-lg: 0 20px 25px -5px rgba(0,0,0,0.1), 0 10px 10px -5px rgba(0,0,0,0.04);
  --shadow-xl: 0 25px 50px -12px rgba(0,0,0,0.25);

  /* 圆角 */
  --radius-sm: 6px;
  --radius: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* 过渡 */
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-fast: all 0.15s ease;

  /* 字体 */
  --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
}

/* ==================== 基础重置 ==================== */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--bg-white);
  overflow-x: hidden;
}

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

ul { list-style: none; }
img { max-width: 100%; height: auto; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
input, select, textarea { font-family: inherit; }

/* ==================== 工具类 ==================== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

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

.gradient-text-white {
  background: linear-gradient(135deg, #ffffff 0%, #c4b5fd 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

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

.section-tag {
  display: inline-block;
  padding: 6px 16px;
  font-size: 14px;
  font-weight: 500;
  color: var(--primary);
  background: rgba(239, 68, 68, 0.1);
  border-radius: var(--radius-full);
  margin-bottom: 16px;
}

.section-tag-white {
  color: #c4b5fd;
  background: rgba(255, 255, 255, 0.15);
}

.section-title {
  font-size: 40px;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 12px;
}

.section-desc {
  font-size: 18px;
  color: var(--text-secondary);
}

/* ==================== 按钮 ==================== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  font-size: 16px;
  font-weight: 600;
  border-radius: var(--radius-full);
  transition: var(--transition);
  cursor: pointer;
  border: none;
  font-family: inherit;
}

.btn-primary {
  background: var(--gradient-primary);
  color: white;
  box-shadow: 0 4px 14px 0 rgba(239, 68, 68, 0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px 0 rgba(239, 68, 68, 0.5);
}

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

.btn-secondary:hover {
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-2px);
}

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

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

.navbar.scrolled {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: var(--shadow-sm);
  padding: 12px 0;
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: inline-flex;
  align-items: center;
}

.nav-logo img {
  height: 60px;
  width: auto;
  display: block;
}

.nav-menu {
  display: flex;
  gap: 32px;
}

.nav-link {
  font-size: 15px;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  padding: 4px 0;
}

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

.nav-link:hover,
.nav-link.active {
  color: var(--primary);
}

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

.nav-cta {
  padding: 10px 24px;
  background: var(--gradient-primary);
  color: white;
  font-size: 14px;
  font-weight: 600;
  border-radius: var(--radius-full);
  transition: var(--transition);
}

.nav-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 14px rgba(239, 68, 68, 0.4);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
}

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

.nav-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}
.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}
.nav-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ==================== Hero首屏 ==================== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding: 120px 24px 80px;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  overflow: hidden;
}

.bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(239, 68, 68, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(239, 68, 68, 0.05) 1px, transparent 1px);
  background-size: 60px 60px;
}

.bg-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.4;
}

.glow-1 {
  width: 600px;
  height: 600px;
  background: var(--primary);
  top: -200px;
  right: -150px;
}

.glow-2 {
  width: 500px;
  height: 500px;
  background: var(--accent);
  bottom: -150px;
  left: -100px;
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 800px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 20px;
  font-size: 14px;
  font-weight: 500;
  color: var(--primary);
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.2);
  border-radius: var(--radius-full);
  margin-bottom: 28px;
  animation: fadeInUp 0.8s ease;
}

.hero-title {
  font-size: 64px;
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 24px;
  animation: fadeInUp 0.8s ease 0.1s both;
}

.hero-subtitle {
  font-size: 20px;
  color: var(--text-secondary);
  margin-bottom: 40px;
  animation: fadeInUp 0.8s ease 0.2s both;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  margin-bottom: 64px;
  animation: fadeInUp 0.8s ease 0.3s both;
}

.hero-stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 48px;
  animation: fadeInUp 0.8s ease 0.4s both;
}

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

.stat-number {
  font-size: 42px;
  font-weight: 700;
  color: var(--primary);
  line-height: 1;
}

.stat-number::after,
.about-stat-number::after {
  content: attr(data-suffix);
  font-size: 0.55em;
  font-weight: 700;
  vertical-align: super;
  margin-left: 2px;
}

.stat-label {
  font-size: 14px;
  color: var(--text-muted);
  margin-top: 8px;
}

.stat-divider {
  width: 1px;
  height: 40px;
  background: var(--border);
}

.hero-scroll {
  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: 12px;
  animation: bounce 2s ease infinite;
}

.scroll-indicator {
  width: 24px;
  height: 40px;
  border: 2px solid var(--text-muted);
  border-radius: var(--radius-full);
  display: flex;
  justify-content: center;
  padding-top: 8px;
}

.scroll-dot {
  width: 4px;
  height: 8px;
  background: var(--primary);
  border-radius: 2px;
  animation: scrollDown 1.5s ease infinite;
}

/* ==================== 推三返一理念 ==================== */
.concept {
  padding: 120px 0;
  background: var(--bg-white);
}

.concept-diagram {
  max-width: 960px;
  margin: 0 auto 80px;
  display: flex;
  align-items: stretch;
  gap: 24px;
}

/* 三步流程步骤 */
.flow-step {
  flex: 1;
  position: relative;
  padding-top: 48px;
}

.flow-step-num {
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--gradient-primary);
  color: white;
  font-weight: 700;
  font-size: 15px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 6px 16px rgba(239, 68, 68, 0.3);
}

.flow-card {
  height: 100%;
  padding: 28px 22px;
  background: var(--bg-gray);
  border-radius: var(--radius-lg);
  text-align: center;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.flow-card:hover {
  background: var(--bg-white);
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.flow-avatar {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  overflow: hidden;
  border: 3px solid #fff;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.12);
  margin-bottom: 16px;
}

.flow-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.flow-card h4 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 10px;
}

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

.flow-friends {
  display: flex;
  gap: 14px;
  margin-bottom: 16px;
}

.friend {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.friend img {
  width: 54px;
  height: 54px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid #fff;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
}

.friend span {
  font-size: 12px;
  color: var(--text-muted);
}

.flow-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  flex-shrink: 0;
  opacity: 0.7;
}

.flow-reward {
  display: flex;
  flex-direction: column;
  gap: 12px;
  width: 100%;
  margin-bottom: 14px;
}

.reward-item {
  background: linear-gradient(135deg, rgba(234, 179, 8, 0.12), rgba(249, 115, 22, 0.12));
  border: 2px solid var(--secondary);
  border-radius: 12px;
  padding: 12px 14px;
  text-align: left;
}

.reward-tag {
  display: block;
  font-weight: 700;
  color: var(--secondary);
  font-size: 15px;
  margin-bottom: 4px;
}

.reward-item p {
  font-size: 13px;
  color: var(--text-secondary);
}

.flow-note {
  margin-top: 22px;
  width: 100%;
  padding: 14px 16px;
  background: rgba(239, 68, 68, 0.06);
  border: 1px dashed var(--primary);
  border-radius: 12px;
  font-size: 13px;
  color: var(--text-secondary);
  text-align: center;
}

.diagram-center {
  display: flex;
  justify-content: center;
}

.center-node {
  width: 120px;
  height: 120px;
  background: var(--gradient-primary);
  color: white;
  border-radius: 50%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  font-size: 16px;
  font-weight: 600;
  box-shadow: 0 10px 30px rgba(239, 68, 68, 0.3);
  position: relative;
  animation: pulse 3s ease infinite;
}

.branch { position: relative; }

.branch-lines {
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 100%;
  height: 2px;
}

.branch-lines .line {
  position: absolute;
  left: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--primary) 0%, transparent 100%);
  width: 30px;
}

.branch-lines .line-1 { top: 33%; }
.branch-lines .line-2 { top: 50%; }
.branch-lines .line-3 { top: 67%; }

.branch-nodes {
  display: flex;
  flex-direction: column;
  gap: 20px;
  padding-left: 40px;
}

.node {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 20px;
  background: var(--bg-gray);
  border-radius: var(--radius);
  transition: var(--transition);
}

.node:hover {
  transform: translateX(8px);
  box-shadow: var(--shadow-md);
}

.node-icon {
  width: 48px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(239, 68, 68, 0.1);
  color: var(--primary);
  border-radius: var(--radius);
}

.node span {
  font-weight: 600;
  color: var(--text-primary);
}

.node em {
  font-style: normal;
  font-size: 14px;
  color: var(--secondary);
  margin-left: auto;
  font-weight: 500;
}

.branch-return {
  grid-column: 1 / -1;
  display: flex;
  justify-content: center;
}

.return-card {
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 24px 40px;
  background: linear-gradient(135deg, rgba(234, 179, 8, 0.1) 0%, rgba(249, 115, 22, 0.1) 100%);
  border: 2px solid var(--secondary);
  border-radius: var(--radius-lg);
}

.return-icon {
  width: 60px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gradient-success);
  color: white;
  border-radius: 50%;
}

.return-content strong {
  display: block;
  font-size: 14px;
  color: var(--text-secondary);
  font-weight: 500;
}

.return-content .return-amount {
  display: block;
  font-size: 32px;
  font-weight: 700;
  color: var(--secondary);
  margin: 4px 0;
}

.return-content p {
  font-size: 14px;
  color: var(--text-muted);
}

.concept-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  margin-bottom: 80px;
}

.concept-card {
  position: relative;
  padding: 40px 32px;
  background: var(--bg-gray);
  border-radius: var(--radius-lg);
  transition: var(--transition);
  overflow: hidden;
}

.concept-card:hover {
  background: var(--bg-white);
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.card-number {
  font-size: 64px;
  font-weight: 800;
  color: rgba(239, 68, 68, 0.1);
  line-height: 1;
  margin-bottom: 16px;
}

.concept-card h3 {
  font-size: 22px;
  font-weight: 600;
  margin-bottom: 12px;
}

.concept-card p {
  color: var(--text-secondary);
  font-size: 15px;
  margin-bottom: 24px;
}

.card-icon {
  position: absolute;
  right: 24px;
  bottom: 24px;
  color: var(--primary);
  opacity: 0.2;
}

.concept-highlight {
  padding: 48px;
  background: var(--gradient-primary);
  border-radius: var(--radius-xl);
  color: white;
  text-align: center;
}

.highlight-content h3 {
  font-size: 28px;
  font-weight: 600;
  margin-bottom: 20px;
  text-align: center;
}

.highlight-content p {
  font-size: 18px;
  margin-bottom: 8px;
  opacity: 0.9;
}

.highlight-emphasis {
  font-size: 20px !important;
  font-weight: 600;
  margin-top: 16px !important;
  opacity: 1 !important;
}

/* ==================== 产品能力 ==================== */
.product {
  padding: 120px 0;
  background: var(--bg-gray);
}

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

.product-card {
  padding: 36px 28px;
  background: var(--bg-white);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-light);
  transition: var(--transition);
}

.product-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}

.product-icon {
  width: 72px;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gradient-primary);
  color: white;
  border-radius: var(--radius-xl);
  margin-bottom: 24px;
}

.product-card h3 {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 12px;
}

.product-card p {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ==================== 合作模式 ==================== */
.cooperation {
  padding: 120px 0;
  background: var(--bg-white);
}

.coop-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.coop-card {
  position: relative;
  padding: 40px 32px;
  background: var(--bg-gray);
  border-radius: var(--radius-xl);
  border: 2px solid transparent;
  transition: var(--transition);
}

.coop-card.featured {
  background: linear-gradient(135deg, rgba(239, 68, 68, 0.05) 0%, rgba(249, 115, 22, 0.05) 100%);
  border-color: var(--primary);
}

.coop-badge {
  position: absolute;
  top: -12px;
  left: 32px;
  padding: 4px 14px;
  font-size: 12px;
  font-weight: 600;
  color: white;
  background: var(--gradient-primary);
  border-radius: var(--radius-full);
}

.coop-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 16px;
}

.coop-icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(239, 68, 68, 0.1);
  color: var(--primary);
  border-radius: var(--radius);
}

.coop-card.featured .coop-icon {
  background: var(--gradient-primary);
  color: white;
}

.coop-header h3 {
  font-size: 22px;
  font-weight: 600;
}

.coop-desc {
  font-size: 15px;
  color: var(--text-secondary);
  margin-bottom: 24px;
}

.coop-features {
  margin-bottom: 28px;
}

.coop-features li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--text-secondary);
  padding: 8px 0;
}

.coop-features li svg {
  color: var(--secondary);
  flex-shrink: 0;
}

.coop-price {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 24px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}

.price-label {
  font-size: 14px;
  color: var(--text-muted);
}

.price-value {
  font-size: 28px;
  font-weight: 700;
  color: var(--text-primary);
}

.price-period {
  font-size: 14px;
  color: var(--text-muted);
  font-weight: 400;
}

.coop-cta {
  display: block;
  text-align: center;
  padding: 14px;
  font-size: 16px;
  font-weight: 600;
  border-radius: var(--radius-full);
  transition: var(--transition);
}

.coop-card:not(.featured) .coop-cta {
  background: var(--bg-white);
  color: var(--primary);
  border: 2px solid var(--primary);
}

.coop-card:not(.featured) .coop-cta:hover {
  background: var(--primary);
  color: white;
}

.coop-card.featured .coop-cta {
  background: var(--gradient-primary);
  color: white;
  box-shadow: 0 4px 14px rgba(239, 68, 68, 0.4);
}

.coop-card.featured .coop-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(239, 68, 68, 0.5);
}

/* ==================== 信任背书 ==================== */
.trust {
  padding: 80px 0;
  background: var(--bg-gray);
}

.trust-banner {
  text-align: center;
  margin-bottom: 48px;
}

.trust-banner h2 {
  font-size: 36px;
  font-weight: 600;
  margin-bottom: 12px;
}

.trust-banner h2 strong {
  color: var(--primary);
}

.trust-banner p {
  color: var(--text-secondary);
  font-size: 16px;
}

.logo-wall {
  display: flex;
  justify-content: center;
  gap: 48px;
  flex-wrap: wrap;
}

.logo-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 24px 32px;
  background: var(--bg-white);
  border-radius: var(--radius);
  color: var(--text-muted);
  transition: var(--transition);
  min-width: 120px;
}

.logo-item:hover {
  color: var(--primary);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.logo-item svg {
  color: currentColor;
}

.logo-item span {
  font-size: 14px;
  font-weight: 500;
}

/* ==================== 关于我们 ==================== */
.about {
  padding: 120px 0;
  background: var(--bg-white);
}

.about-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 60px;
  align-items: center;
}

.about-text p {
  font-size: 17px;
  line-height: 1.8;
  color: var(--text-secondary);
  margin-bottom: 20px;
}

.about-text p strong {
  color: var(--text-primary);
}

.about-emphasis {
  font-size: 18px !important;
  font-weight: 600 !important;
  color: var(--primary) !important;
  margin-top: 24px !important;
}

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

.about-stat {
  padding: 32px;
  background: var(--bg-gray);
  border-radius: var(--radius-lg);
  text-align: center;
  transition: var(--transition);
}

.about-stat:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.about-stat-number {
  font-size: 48px;
  font-weight: 700;
  color: var(--primary);
  line-height: 1;
  margin-bottom: 8px;
}

.about-stat-label {
  font-size: 14px;
  color: var(--text-muted);
}

/* ==================== 联系我们 ==================== */
.contact {
  padding: 120px 0;
  background: var(--bg-gray);
}

.contact-card {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  background: var(--bg-dark);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
}

.contact-left {
  padding: 64px;
  background: linear-gradient(135deg, #0f172a 0%, #1e1b4b 100%);
  color: white;
}

.contact-left h2 {
  font-size: 36px;
  font-weight: 700;
  margin-bottom: 16px;
  line-height: 1.2;
}

.contact-left p {
  font-size: 16px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.7);
  margin-bottom: 40px;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px;
  background: rgba(255, 255, 255, 0.05);
  border-radius: var(--radius);
}

.contact-icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius);
  flex-shrink: 0;
}

.contact-icon-img {
  width: 28.8px;
  height: 28.8px;
}

.contact-item strong {
  display: block;
  font-size: 13px;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.5);
  margin-bottom: 2px;
}

.contact-item span {
  font-size: 15px;
  font-weight: 600;
}

.contact-right {
  padding: 64px;
  background: var(--bg-white);
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 14px 18px;
  font-size: 15px;
  color: var(--text-primary);
  background: var(--bg-gray);
  border: 2px solid transparent;
  border-radius: var(--radius);
  transition: var(--transition);
  outline: none;
  resize: none;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--text-muted);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--primary);
  background: var(--bg-white);
}

.form-tip {
  font-size: 13px;
  color: var(--text-muted);
  text-align: center;
}

/* ==================== 页脚 ==================== */
.footer {
  padding: 64px 0 32px;
  background: var(--bg-dark-2);
  color: var(--text-light);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-brand .nav-logo {
  color: white;
  margin-bottom: 16px;
}

.footer-brand .nav-logo img {
  height: 60px;
}

.footer-brand p {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.6);
  line-height: 1.7;
}

.footer-links h4 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 16px;
  color: white;
}

.footer-links a,
.footer-links p {
  display: block;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.6);
  padding: 6px 0;
  transition: var(--transition-fast);
}

.footer-links a:hover {
  color: white;
}

.footer-bottom {
  padding-top: 32px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.4);
}

.footer-legal a {
  color: rgba(255, 255, 255, 0.6);
  transition: var(--transition-fast);
}

.footer-legal a:hover { color: white; }
.footer-legal span { margin: 0 12px; }

/* ==================== 返回顶部 ==================== */
.back-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 48px;
  height: 48px;
  background: var(--gradient-primary);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: var(--transition);
  z-index: 999;
  box-shadow: var(--shadow-md);
}

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

.back-top:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.back-top-img {
  width: 24px;
  height: 24px;
}

/* ==================== Toast提示 ==================== */
.toast {
  position: fixed;
  top: 100px;
  left: 50%;
  transform: translateX(-50%) translateY(-20px);
  padding: 14px 28px;
  background: var(--bg-dark);
  color: white;
  font-size: 14px;
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  z-index: 2000;
}

.toast.show {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

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

@keyframes pulse {
  0%, 100% {
    box-shadow: 0 10px 30px rgba(239, 68, 68, 0.3);
  }
  50% {
    box-shadow: 0 10px 50px rgba(239, 68, 68, 0.5);
  }
}

@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(10px); }
}

@keyframes scrollDown {
  0% { transform: translateY(0); opacity: 1; }
  100% { transform: translateY(12px); opacity: 0; }
}

.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

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

/* ==================== 推三返一 · 双券体系 ==================== */
.coupon-system {
  margin-top: 80px;
  margin-bottom: 40px;
}

.coupon-title {
  text-align: center;
  font-size: 24px;
  font-weight: 600;
  margin-bottom: 32px;
}

.coupon-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.coupon-card {
  padding: 32px;
  background: var(--bg-gray);
  border-radius: var(--radius-xl);
  border: 2px solid transparent;
  transition: var(--transition);
}

.coupon-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.coupon-card-a {
  border-color: rgba(239, 68, 68, 0.2);
}

.coupon-card-b {
  border-color: rgba(234, 179, 8, 0.25);
  background: linear-gradient(135deg, rgba(234, 179, 8, 0.08) 0%, rgba(249, 115, 22, 0.05) 100%);
}

.coupon-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.coupon-badge {
  padding: 4px 12px;
  font-size: 14px;
  font-weight: 700;
  border-radius: var(--radius-full);
  color: white;
}

.coupon-badge-a {
  background: var(--gradient-primary);
}

.coupon-badge-b {
  background: linear-gradient(135deg, #eab308 0%, #f97316 100%);
}

.coupon-type {
  font-size: 12px;
  font-family: 'Menlo', 'Monaco', monospace;
  color: var(--text-muted);
  background: rgba(0,0,0,0.05);
  padding: 3px 8px;
  border-radius: 4px;
}

.coupon-card h4 {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 12px;
}

.coupon-card > p {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 20px;
  line-height: 1.6;
}

.coupon-rules {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.coupon-rules li {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
  display: flex;
  align-items: center;
  gap: 6px;
}

.rule-icon {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

.coupon-rules strong {
  color: var(--text-primary);
}

.return-divider {
  width: 1px;
  height: 40px;
  background: rgba(239, 68, 68, 0.3);
}

.compare-table-wrap {
  margin: 24px 0 8px;
  overflow-x: auto;
}

.compare-table {
  width: 100%;
  min-width: 640px;
  border-collapse: collapse;
  background: rgba(255, 255, 255, 0.08);
  border-radius: var(--radius);
  overflow: hidden;
}

.compare-table th {
  background: rgba(255, 255, 255, 0.14);
  color: #fff;
  padding: 14px 18px;
  font-size: 15px;
  text-align: center;
  white-space: nowrap;
}

.compare-table th.th-adv {
  background: rgba(251, 191, 36, 0.22);
  color: #ffe97a;
}

.compare-table td {
  color: rgba(255, 255, 255, 0.88);
  padding: 13px 18px;
  font-size: 14px;
  line-height: 1.5;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
}

.compare-table td.dim {
  color: #ffd9a0;
  font-weight: 600;
  white-space: nowrap;
  background: rgba(239, 68, 68, 0.14);
}

.compare-table td.adv {
  color: #ffe97a;
  font-weight: 600;
  background: rgba(251, 191, 36, 0.08);
}

/* ==================== 多端覆盖 ==================== */
.platforms {
  padding: 120px 0;
  background: var(--bg-white);
}

.platform-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 48px;
}

.platform-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 32px 16px;
  background: var(--bg-gray);
  border-radius: var(--radius-lg);
  transition: var(--transition);
  border: 1px solid transparent;
}

.platform-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: rgba(239, 68, 68, 0.2);
  background: var(--bg-white);
}

.platform-icon {
  width: 64px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}

.platform-icon img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  border-radius: 12px;
}

.platform-name {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.platform-tag {
  font-size: 12px;
  font-style: normal;
  color: var(--primary);
  background: rgba(239, 68, 68, 0.08);
  padding: 3px 10px;
  border-radius: var(--radius-full);
}

.platform-tech {
  display: flex;
  justify-content: center;
  gap: 48px;
  padding-top: 32px;
  border-top: 1px solid var(--border);
}

.tech-item {
  display: flex;
  align-items: center;
  gap: 12px;
}

.tech-item code {
  font-size: 14px;
  font-weight: 700;
  color: var(--primary);
  background: rgba(239, 68, 68, 0.08);
  padding: 6px 14px;
  border-radius: 6px;
  font-family: 'Menlo', 'Monaco', monospace;
}

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

/* ==================== 采购供应链 ==================== */
.supply {
  padding: 120px 0;
  background: var(--bg-gray);
}

.supply-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-bottom: 64px;
}

.supply-card {
  position: relative;
  padding: 28px;
  background: var(--bg-white);
  border-radius: var(--radius-lg);
  transition: var(--transition);
  border: 1px solid var(--border-light);
}

.supply-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.supply-featured {
  grid-column: 1 / -1;
  background: linear-gradient(135deg, rgba(239, 68, 68, 0.04) 0%, rgba(249, 115, 22, 0.04) 100%);
  border-color: rgba(239, 68, 68, 0.2);
}

.supply-wide {
  grid-column: 1 / -1;
}

.supply-badge {
  position: absolute;
  top: -10px;
  left: 20px;
  padding: 4px 12px;
  font-size: 12px;
  font-weight: 600;
  color: white;
  background: var(--gradient-primary);
  border-radius: var(--radius-full);
}

.supply-card-inner {
  display: flex;
  align-items: flex-start;
  gap: 20px;
}

.supply-logo {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.supply-logo img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  border-radius: 8px;
}

.supply-info h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
}

.supply-info p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
}

.supply-apis {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}

.api-tag {
  font-size: 12px;
  font-family: 'Menlo', 'Monaco', monospace;
  color: var(--primary);
  background: rgba(239, 68, 68, 0.08);
  padding: 4px 10px;
  border-radius: 6px;
}

.supply-warn {
  display: inline-block;
  margin-top: 8px;
  font-size: 11px;
  color: #f59e0b;
  font-weight: 500;
}

/* 1688 全链路 */
.supply-pipeline {
  padding: 48px;
  background: var(--bg-white);
  border-radius: var(--radius-xl);
  border: 1px solid var(--border);
}

.supply-pipeline h3 {
  text-align: center;
  font-size: 22px;
  font-weight: 600;
  margin-bottom: 40px;
}

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

.pipeline-step {
  flex: 1;
  text-align: center;
}

.step-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  background: var(--gradient-primary);
  color: white;
  font-size: 20px;
  font-weight: 700;
  border-radius: 50%;
  box-shadow: 0 4px 12px rgba(239, 68, 68, 0.3);
}

.step-content h4 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 6px;
}

.step-content p {
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 1.5;
  font-family: 'Menlo', 'Monaco', monospace;
}

.pipeline-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 48px;
  font-size: 20px;
  color: var(--primary);
  font-weight: 300;
}

/* ==================== 技术架构 ==================== */
.tech {
  padding: 120px 0;
  background: var(--bg-white);
}

.tech-architecture {
  max-width: 900px;
  margin: 0 auto 48px;
}

.arch-layer {
  padding: 20px 24px;
  background: var(--bg-gray);
  border-radius: var(--radius);
  margin-bottom: 0;
}

.arch-layer-strong {
  background: linear-gradient(135deg, rgba(239, 68, 68, 0.06) 0%, rgba(249, 115, 22, 0.04) 100%);
  border: 1px solid rgba(239, 68, 68, 0.15);
}

.arch-layer-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 14px;
}

.arch-items {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.arch-items code {
  font-size: 12px;
  font-family: 'Menlo', 'Monaco', monospace;
  color: var(--text-secondary);
  background: white;
  border: 1px solid var(--border-light);
  padding: 6px 12px;
  border-radius: 6px;
}

.arch-layer-strong .arch-items code {
  color: var(--primary);
  border-color: rgba(239, 68, 68, 0.2);
  background: rgba(239, 68, 68, 0.05);
}

.arch-arrow {
  text-align: center;
  font-size: 20px;
  color: var(--primary);
  font-weight: 300;
  padding: 12px 0;
}

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

.tech-feature {
  display: flex;
  gap: 16px;
  padding: 24px;
  background: var(--bg-gray);
  border-radius: var(--radius);
}

.feature-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(239, 68, 68, 0.08);
  color: var(--primary);
  border-radius: var(--radius);
  flex-shrink: 0;
}

.tech-feature h4 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 4px;
}

.tech-feature p {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* ==================== 界面展示 ==================== */
.showcase {
  padding: 120px 0;
  background: var(--bg-gray);
}

.showcase-carousel {
  position: relative;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 60px;
  overflow: visible;
}

.carousel-track {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 20px;
  position: relative;
}

.carousel-slide {
  flex-shrink: 0;
  width: 200px;
  transition: transform 0.45s cubic-bezier(0.25, 0.46, 0.45, 0.94),
              opacity 0.45s ease,
              filter 0.45s ease;
  transform-origin: center center;
  opacity: 0.35;
  transform: scale(0.6);
  filter: blur(2px);
  pointer-events: none;
}

.carousel-slide.active {
  opacity: 1;
  transform: scale(1.16);
  filter: none;
  z-index: 5;
  pointer-events: auto;
}

.carousel-slide.prev,
.carousel-slide.next {
  opacity: 0.8;
  transform: scale(0.82);
  filter: blur(0.6px);
  z-index: 4;
  pointer-events: auto;
}

.carousel-slide.prev-2,
.carousel-slide.next-2 {
  opacity: 0.2;
  transform: scale(0.45);
  filter: blur(2px);
  z-index: 3;
}

.showcase-frame {
  position: relative;
  width: 100%;
  aspect-ratio: 9 / 19.5;
  background: #0a0a0a;
  border-radius: 40px;
  padding: 5px;
  box-shadow:
    0 16px 36px rgba(0, 0, 0, 0.18),
    0 4px 10px rgba(0, 0, 0, 0.08);
  margin-bottom: 20px;
}

.carousel-slide.active .showcase-frame {
  box-shadow:
    0 24px 48px rgba(239, 68, 68, 0.25),
    0 8px 20px rgba(0, 0, 0, 0.12);
}

.frame-notch {
  position: absolute;
  top: 8px;
  left: 50%;
  transform: translateX(-50%);
  width: 56px;
  height: 16px;
  background: #0a0a0a;
  border-radius: 12px;
  z-index: 2;
}

.frame-screen {
  width: 100%;
  height: 100%;
  border-radius: 35px;
  overflow: hidden;
}

.frame-screen img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

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

.showcase-caption h4 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 4px;
}

.showcase-caption p {
  font-size: 12px;
  color: var(--text-secondary);
}

.carousel-btn {
  position: absolute;
  top: 45%;
  transform: translateY(-50%);
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: white;
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text-primary);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
  transition: var(--transition);
  z-index: 10;
}

.carousel-btn:hover {
  background: var(--gradient-primary);
  color: white;
  border-color: transparent;
  box-shadow: 0 6px 16px rgba(239, 68, 68, 0.3);
}

.carousel-prev { left: 0; }
.carousel-next { right: 0; }

.carousel-dots {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-top: 48px;
}

.carousel-dots .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #d1d5db;
  cursor: pointer;
  transition: var(--transition);
}

.carousel-dots .dot.active {
  width: 24px;
  border-radius: 4px;
  background: var(--gradient-primary);
}

/* ==================== 响应式（新增板块） ==================== */
@media (max-width: 1024px) {
  .showcase-carousel { padding: 0 50px; }
  .carousel-slide { width: 170px; }
}

@media (max-width: 768px) {
  .showcase-carousel { padding: 0 40px; }
  .carousel-slide { width: 110px; }
  .carousel-slide.prev-2, .carousel-slide.next-2 { opacity: 0; pointer-events: none; }
}

/* ==================== 响应式 ==================== */
@media (max-width: 1024px) {
  .hero-title { font-size: 48px; }
  .section-title { font-size: 32px; }
  .concept-diagram { flex-direction: column; gap: 16px; }
  .flow-arrow { transform: rotate(90deg); padding: 6px 0; }
  .product-grid { grid-template-columns: repeat(2, 1fr); }
  .about-grid { grid-template-columns: 1fr; }
  .contact-card { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: 65px;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    padding: 24px;
    background: white;
    box-shadow: var(--shadow-md);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
  }
  .nav-menu.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }
  .nav-menu li { padding: 12px 0; border-bottom: 1px solid var(--border-light); }
  .nav-menu li:last-child { border-bottom: none; }
  .nav-cta { display: none; }
  .nav-toggle { display: flex; }

  .hero-title { font-size: 36px; }
  .hero-subtitle { font-size: 16px; }
  .hero-buttons { flex-direction: column; align-items: center; }
  .hero-stats { gap: 32px; }
  .stat-number { font-size: 32px; }

  .concept { padding: 80px 0; }
  .concept-cards { grid-template-columns: 1fr; }
  .product { padding: 80px 0; }
  .product-grid { grid-template-columns: 1fr; }
  .cooperation { padding: 80px 0; }
  .coop-grid { grid-template-columns: 1fr; }
  .about { padding: 80px 0; }
  .about-stats { grid-template-columns: 1fr 1fr; }
  .contact { padding: 80px 0; }
  .contact-left, .contact-right { padding: 40px 28px; }
  .contact-left h2 { font-size: 28px; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; gap: 12px; text-align: center; }

  .section-title { font-size: 28px; }
  .section-desc { font-size: 15px; }
  .trust-banner h2 { font-size: 24px; }
  .logo-wall { gap: 16px; }
}

@media (max-width: 480px) {
  .hero-title { font-size: 28px; }
  .hero-stats { flex-direction: column; gap: 24px; }
  .stat-divider { width: 40px; height: 1px; }
  .about-stats { grid-template-columns: 1fr; }
  .about-stat-number { font-size: 40px; }
  .node { flex-wrap: wrap; }
  .node em { margin-left: auto; }
  .return-card { flex-direction: column; text-align: center; }
}