/* ============================================================
   超无穹官网公共样式 v4.0 · 丝滑体验升级
   ============================================================ */

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

:root {
  /* 主色系 */
  --green-50: #f0fdf4;
  --green-100: #dcfce7;
  --green-200: #bbf7d0;
  --green-300: #86efac;
  --green-400: #4ade80;
  --green-500: #22c55e;
  --green-600: #16a34a;
  --green-700: #15803d;
  --green-800: #166534;
  --green-900: #14532d;
  --green-950: #052e16;

  /* 语义色 */
  --primary: var(--green-600);
  --primary-hover: var(--green-700);
  --primary-light: var(--green-50);
  --primary-subtle: var(--green-100);

  /* 中性色 */
  --gray-50: #fafafa;
  --gray-100: #f4f4f5;
  --gray-200: #e4e4e7;
  --gray-300: #d4d4d8;
  --gray-400: #a1a1aa;
  --gray-500: #71717a;
  --gray-600: #52525b;
  --gray-700: #3f3f46;
  --gray-800: #27272a;
  --gray-900: #18181b;
  --gray-950: #09090b;

  /* 功能色 */
  --white: #ffffff;
  --bg: #fafafa;
  --card: #ffffff;
  --text: var(--gray-900);
  --text-secondary: var(--gray-600);
  --text-muted: var(--gray-500);
  --border: var(--gray-200);
  --border-hover: var(--gray-300);

  /* 阴影 */
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  --shadow-green: 0 4px 14px rgba(22, 163, 74, 0.15);
  --shadow-green-lg: 0 10px 30px rgba(22, 163, 74, 0.2);
  --shadow-card: 0 1px 3px rgba(0,0,0,0.04), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-card-hover: 0 20px 40px -12px rgba(0,0,0,0.12), 0 0 0 1px rgba(22,163,74,0.08);

  /* 圆角 */
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-2xl: 20px;
  --radius-full: 9999px;

  /* 间距 */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;
  --space-20: 80px;

  /* 过渡 - 统一使用丝滑曲线 */
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-out-back: cubic-bezier(0.34, 1.56, 0.64, 1);
  --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);
  --transition-fast: 200ms var(--ease-smooth);
  --transition-base: 300ms var(--ease-out-expo);
  --transition-slow: 400ms var(--ease-out-expo);
  --transition-bounce: 500ms var(--ease-out-back);

  /* 字体 */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Fira Mono", "Roboto Mono", monospace;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  min-height: 100vh;
}

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

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

button {
  font-family: inherit;
}

/* ===== 滚动进度条 ===== */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--green-400), var(--green-600));
  z-index: 1001;
  transition: width 80ms linear;
  border-radius: 0 2px 2px 0;
}

/* ===== 毛玻璃导航 ===== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: blur(24px) saturate(180%);
  -webkit-backdrop-filter: blur(24px) saturate(180%);
  border-bottom: 1px solid rgba(0, 0, 0, 0.04);
  padding: 0 5%;
  transition: all 400ms var(--ease-out-expo);
}

.nav--scrolled {
  background: rgba(255, 255, 255, 0.92);
  box-shadow: 0 1px 8px rgba(0, 0, 0, 0.04);
  border-bottom-color: rgba(0, 0, 0, 0.06);
}

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 22px;
  font-weight: 800;
  color: var(--gray-900);
  text-decoration: none;
  letter-spacing: -0.5px;
  transition: opacity var(--transition-fast);
}

.nav-logo:hover {
  opacity: 0.8;
}

.nav-logo span {
  background: linear-gradient(135deg, var(--green-500), var(--green-700));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links {
  display: flex;
  gap: var(--space-1);
  list-style: none;
  align-items: center;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 15px;
  font-weight: 500;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  position: relative;
}

.nav-links a:not(.nav-btn):hover {
  color: var(--text);
  background: rgba(0,0,0,0.03);
}

.nav-links a.active {
  color: var(--primary);
  background: var(--primary-light);
}

/* 导航下划线 */
.nav-links a:not(.nav-btn)::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--green-500);
  border-radius: 1px;
  transition: all var(--transition-base);
  transform: translateX(-50%);
}

.nav-links a:not(.nav-btn):hover::after,
.nav-links a:not(.nav-btn).active::after {
  width: 60%;
}

.nav-btn {
  padding: var(--space-2) var(--space-5) !important;
  background: var(--primary) !important;
  color: var(--white) !important;
  border-radius: var(--radius-full) !important;
  font-weight: 600 !important;
  transition: all var(--transition-base) !important;
}

.nav-btn:hover {
  background: var(--primary-hover) !important;
  transform: translateY(-1px);
  box-shadow: var(--shadow-green);
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  width: 36px;
  height: 36px;
  padding: 6px;
  cursor: pointer;
  position: relative;
  z-index: 1001;
  -webkit-tap-highlight-color: transparent;
}

.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--gray-700);
  border-radius: 2px;
  position: absolute;
  left: 6px;
  transition: all 0.3s var(--ease-out-expo);
  transform-origin: center;
}

.menu-toggle span:nth-child(1) { top: 10px; }
.menu-toggle span:nth-child(2) { top: 17px; }
.menu-toggle span:nth-child(3) { top: 24px; }

.menu-toggle.active span:nth-child(1) {
  top: 17px;
  transform: rotate(45deg);
}

.menu-toggle.active span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.menu-toggle.active span:nth-child(3) {
  top: 17px;
  transform: rotate(-45deg);
}

.menu-toggle:active {
  transform: scale(0.9);
}

/* ===== HERO ===== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 140px 5% 100px;
  background: linear-gradient(180deg, var(--white) 0%, var(--green-50) 50%, var(--white) 100%);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background:
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(34, 197, 94, 0.12), transparent),
    radial-gradient(ellipse 60% 40% at 80% 50%, rgba(34, 197, 94, 0.06), transparent);
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(34, 197, 94, 0.04) 0%, transparent 70%);
  transform: translate(-50%, -50%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 900px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: var(--space-8);
  box-shadow: var(--shadow-sm);
  animation: badgePulse 3s ease-in-out infinite;
}

@keyframes badgePulse {
  0%, 100% { box-shadow: var(--shadow-sm); }
  50% { box-shadow: var(--shadow-md), 0 0 0 4px rgba(34, 197, 94, 0.06); }
}

.hero-badge span {
  background: linear-gradient(135deg, var(--green-500), var(--green-600));
  color: var(--white);
  padding: 2px 10px;
  border-radius: var(--radius-full);
  font-size: 12px;
  font-weight: 600;
}

.hero h1 {
  font-size: clamp(36px, 5vw, 64px);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -1.5px;
  margin-bottom: var(--space-6);
  color: var(--gray-950);
}

.hero h1 .gradient {
  background: linear-gradient(135deg, var(--green-600) 0%, var(--green-500) 50%, var(--green-400) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 18px;
  color: var(--text-secondary);
  margin-bottom: var(--space-10);
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.8;
}

.hero-btns {
  display: flex;
  gap: var(--space-4);
  justify-content: center;
  flex-wrap: wrap;
}

.hero-btn {
  padding: var(--space-4) var(--space-8);
  border-radius: var(--radius-full);
  font-size: 16px;
  font-weight: 600;
  text-decoration: none;
  transition: all var(--transition-base);
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}

.hero-btn.primary {
  background: var(--primary);
  color: var(--white);
  box-shadow: var(--shadow-green);
}

.hero-btn.primary:hover {
  background: var(--primary-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-green-lg);
}

.hero-btn.secondary {
  background: var(--white);
  color: var(--text);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-xs);
}

.hero-btn.secondary:hover {
  background: var(--gray-50);
  border-color: var(--border-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

/* Hero 粒子 */
.hero-particles {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  overflow: hidden;
  z-index: 0;
}

.hero-particles .dot {
  position: absolute;
  border-radius: 50%;
  background: var(--green-400);
  opacity: 0.12;
  animation: floatDot linear infinite;
}

@keyframes floatDot {
  0% { transform: translateY(0) scale(1); opacity: 0.12; }
  50% { opacity: 0.24; }
  100% { transform: translateY(-100vh) scale(0.5); opacity: 0; }
}

/* Hero 扫描线 */
.hero-scanline {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(180deg, transparent 0%, rgba(34, 197, 94, 0.02) 50%, transparent 100%);
  animation: scanline 8s ease-in-out infinite;
  pointer-events: none;
  z-index: 0;
}

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

/* ===== SECTION 通用 ===== */
.section {
  padding: var(--space-20) 5%;
  max-width: 1200px;
  margin: 0 auto;
}

.section-alt {
  padding: var(--space-20) 5%;
  background: var(--white);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.section-inner {
  max-width: 1200px;
  margin: 0 auto;
}

.section-title {
  text-align: center;
  font-size: clamp(28px, 3vw, 40px);
  font-weight: 800;
  margin-bottom: var(--space-4);
  letter-spacing: -0.5px;
  color: var(--gray-950);
}

.section-sub {
  text-align: center;
  color: var(--text-secondary);
  font-size: 17px;
  margin-bottom: var(--space-12);
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.7;
}

/* ===== 卡片 ===== */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-6);
}

.card {
  background: var(--card);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  border: 1px solid var(--border);
  transition: all var(--transition-slow);
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--green-400), var(--green-600));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-slow);
}

.card:hover {
  transform: translateY(-6px);
  border-color: var(--green-200);
  box-shadow: var(--shadow-card-hover);
}

.card:hover::before {
  transform: scaleX(1);
}

.card-icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--green-50);
  border-radius: var(--radius-lg);
  font-size: 28px;
  margin-bottom: var(--space-5);
  transition: transform var(--transition-base);
}

.card:hover .card-icon {
  transform: scale(1.08) rotate(-3deg);
}

.card h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: var(--space-3);
  color: var(--gray-900);
}

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

/* ===== 产品矩阵卡 ===== */
.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-6);
  max-width: 1200px;
  margin: 0 auto;
}

.product-card {
  position: relative;
  background: var(--card);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  border: 1px solid var(--border);
  transition: all var(--transition-slow);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.product-card::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--green-400), var(--green-600));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-slow);
}

.product-card:hover {
  transform: translateY(-6px);
  border-color: var(--green-200);
  box-shadow: var(--shadow-card-hover);
}

.product-card:hover::after {
  transform: scaleX(1);
}

.product-card.is-platform {
  background: linear-gradient(135deg, var(--green-600) 0%, var(--green-800) 100%);
  color: var(--white);
  border-color: transparent;
}

.product-card.is-platform::after {
  background: rgba(255, 255, 255, 0.3);
}

.product-card.is-platform h3,
.product-card.is-platform p,
.product-card.is-platform .product-sub,
.product-card.is-platform .product-price {
  color: var(--white);
}

.product-card.is-platform .product-sub {
  color: rgba(255, 255, 255, 0.92);
}

.product-card.is-platform .product-tag {
  background: rgba(255, 255, 255, 0.2);
  color: var(--white);
}

.product-tag {
  display: inline-block;
  background: var(--green-50);
  color: var(--green-700);
  font-size: 12px;
  font-weight: 600;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-5);
  align-self: flex-start;
}

.product-card h3 {
  font-size: 24px;
  font-weight: 800;
  margin-bottom: var(--space-2);
  letter-spacing: -0.5px;
}

.product-card .product-sub {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: var(--space-5);
}

.product-price {
  font-size: 28px;
  font-weight: 800;
  color: var(--green-600);
  margin-bottom: var(--space-1);
  line-height: 1.2;
  letter-spacing: -1px;
}

.product-price small {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-muted);
}

.product-features {
  list-style: none;
  margin: var(--space-5) 0 var(--space-6);
  font-size: 14px;
  color: var(--text-secondary);
  flex: 1;
}

.product-features li {
  padding: var(--space-2) 0;
  border-bottom: 1px solid var(--border);
}

.product-features li:last-child {
  border-bottom: none;
}

.product-features li::before {
  content: '✓';
  color: var(--green-500);
  font-weight: 700;
  margin-right: var(--space-2);
}

.product-card.is-platform .product-features li {
  border-bottom-color: rgba(255, 255, 255, 0.15);
  color: rgba(255, 255, 255, 0.9);
}

.product-card.is-platform .product-features li::before {
  color: rgba(255, 255, 255, 0.8);
}

.product-btn {
  display: inline-block;
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-full);
  font-weight: 600;
  text-decoration: none;
  font-size: 14px;
  transition: all var(--transition-base);
  align-self: flex-start;
  text-align: center;
}

.product-btn.primary {
  background: var(--primary);
  color: var(--white);
}

.product-btn.primary:hover {
  background: var(--primary-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-green);
}

.product-card.is-platform .product-btn.primary {
  background: var(--white);
  color: var(--green-700);
}

.product-card.is-platform .product-btn.primary:hover {
  background: var(--gray-100);
  box-shadow: var(--shadow-md);
}

/* ===== 业务闭环图 ===== */
.loop {
  max-width: 1000px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--space-4);
  padding: var(--space-6);
}

.loop-node {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: var(--space-5) var(--space-6);
  text-align: center;
  min-width: 180px;
  transition: all var(--transition-base);
  box-shadow: var(--shadow-card);
}

.loop-node:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
  border-color: var(--green-200);
}

.loop-node.platform {
  background: linear-gradient(135deg, var(--green-600), var(--green-800));
  color: var(--white);
  border-color: transparent;
}

.loop-node .loop-icon {
  font-size: 32px;
  margin-bottom: var(--space-2);
}

.loop-node .loop-title {
  font-weight: 700;
  font-size: 16px;
  margin-bottom: var(--space-1);
}

.loop-node .loop-sub {
  font-size: 13px;
  opacity: 0.8;
}

.loop-arrow {
  font-size: 28px;
  color: var(--green-400);
  font-weight: 300;
}

/* ===== 定价 ===== */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
  max-width: 1000px;
  margin: 0 auto;
}

.pricing-card {
  background: var(--card);
  border-radius: var(--radius-xl);
  padding: var(--space-10) var(--space-8);
  text-align: center;
  border: 1px solid var(--border);
  transition: all var(--transition-slow);
  position: relative;
  box-shadow: var(--shadow-card);
}

.pricing-card:hover {
  transform: translateY(-6px);
  border-color: var(--green-200);
  box-shadow: var(--shadow-card-hover);
}

.pricing-card.featured {
  border-color: var(--green-300);
  box-shadow: var(--shadow-green);
  transform: scale(1.02);
  background: linear-gradient(135deg, #ffffff 0%, #f0fdf4 100%);
  border: 2px solid var(--green-300);
}

.pricing-card.featured::before {
  content: '热门推荐';
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, var(--green-500), var(--green-700));
  color: var(--white);
  padding: var(--space-1) var(--space-5);
  border-radius: var(--radius-full);
  font-size: 13px;
  font-weight: 600;
  box-shadow: var(--shadow-green);
}

.pricing-card.featured:hover {
  transform: scale(1.02) translateY(-6px);
  box-shadow: var(--shadow-green-lg);
}

.pricing-name {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: var(--space-2);
  color: var(--gray-900);
}

.pricing-card.featured .pricing-name {
  color: var(--green-700);
}

.pricing-price {
  font-size: 42px;
  font-weight: 800;
  color: var(--green-600);
  margin-bottom: var(--space-1);
  line-height: 1.1;
  letter-spacing: -2px;
}

.pricing-price small {
  font-size: 16px;
  font-weight: 500;
  color: var(--text-muted);
  letter-spacing: 0;
}

.pricing-desc {
  color: var(--text-muted);
  font-size: 14px;
  margin-bottom: var(--space-8);
}

.pricing-features {
  text-align: left;
  list-style: none;
  margin-bottom: var(--space-8);
}

.pricing-features li {
  padding: var(--space-3) 0;
  font-size: 14px;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border);
}

.pricing-features li:last-child {
  border-bottom: none;
}

.pricing-features li::before {
  content: '✓';
  color: var(--green-500);
  font-weight: 700;
  margin-right: var(--space-2);
}

.pricing-btn {
  display: inline-block;
  padding: var(--space-3) var(--space-8);
  border-radius: var(--radius-full);
  font-weight: 600;
  text-decoration: none;
  transition: all var(--transition-base);
}

.pricing-btn.primary {
  background: var(--primary);
  color: var(--white);
}

.pricing-btn.primary:hover {
  background: var(--primary-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-green);
}

.pricing-btn.outline {
  background: transparent;
  border: 1.5px solid var(--green-300);
  color: var(--green-700);
}

.pricing-btn.outline:hover {
  background: var(--green-50);
  border-color: var(--green-400);
}

/* ===== 视频教程卡 ===== */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-6);
}

.video-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: all var(--transition-slow);
  box-shadow: var(--shadow-card);
  text-decoration: none;
  color: inherit;
  display: block;
}

.video-card:hover {
  transform: translateY(-6px);
  border-color: var(--green-200);
  box-shadow: var(--shadow-card-hover);
}

.video-thumb {
  position: relative;
  width: 100%;
  height: 180px;
  background: linear-gradient(135deg, var(--green-800), var(--gray-900));
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.video-thumb::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 60%, rgba(0,0,0,0.4) 100%);
}

.video-play {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: rgba(255,255,255,0.2);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1;
  transition: all var(--transition-base);
  border: 2px solid rgba(255,255,255,0.3);
}

.video-card:hover .video-play {
  background: var(--green-600);
  border-color: var(--green-500);
  transform: scale(1.1);
}

.video-play svg {
  width: 24px;
  height: 24px;
  fill: white;
  margin-left: 3px;
}

.video-info {
  padding: var(--space-5) var(--space-6);
}

.video-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: var(--space-2);
  line-height: 1.5;
}

.video-meta {
  font-size: 13px;
  color: var(--text-muted);
}

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

.faq-item {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-3);
  overflow: hidden;
  transition: all var(--transition-base);
  box-shadow: var(--shadow-card);
}

.faq-item:hover {
  border-color: var(--green-200);
}

.faq-item.open {
  border-color: var(--green-300);
  box-shadow: var(--shadow-sm);
  background: linear-gradient(135deg, var(--white), var(--green-50));
}

.faq-q {
  padding: var(--space-5) var(--space-6);
  font-weight: 600;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 15px;
  transition: background var(--transition-fast);
  user-select: none;
  color: var(--gray-800);
}

.faq-q:hover {
  background: var(--gray-50);
}

.faq-q .arrow {
  transition: transform var(--transition-base);
  font-size: 14px;
  flex-shrink: 0;
  color: var(--text-muted);
}

.faq-item.open .faq-q .arrow {
  transform: rotate(180deg);
  color: var(--green-600);
}

.faq-a {
  padding: 0 var(--space-6);
  max-height: 0;
  overflow: hidden;
  transition: max-height 500ms var(--ease-out-expo), padding 300ms var(--ease-smooth);
}

.faq-item.open .faq-a {
  max-height: 400px;
  padding: 0 var(--space-6) var(--space-5);
}

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

/* ===== CTA ===== */
.cta {
  text-align: center;
  padding: var(--space-20) 5%;
  background: linear-gradient(135deg, var(--green-700) 0%, var(--green-900) 100%);
  color: var(--white);
  position: relative;
  overflow: hidden;
}

.cta::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background:
    radial-gradient(ellipse 50% 50% at 20% 50%, rgba(255, 255, 255, 0.05), transparent),
    radial-gradient(ellipse 50% 50% at 80% 50%, rgba(255, 255, 255, 0.05), transparent);
  pointer-events: none;
}

.cta-glow {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 600px;
  height: 300px;
  background: radial-gradient(ellipse, rgba(255, 255, 255, 0.08) 0%, transparent 70%);
  transform: translate(-50%, -50%);
  pointer-events: none;
  animation: ctaGlow 4s ease-in-out infinite alternate;
}

@keyframes ctaGlow {
  0% { opacity: 0.5; transform: translate(-50%, -50%) scale(1); }
  100% { opacity: 1; transform: translate(-50%, -50%) scale(1.2); }
}

.cta h2 {
  font-size: clamp(28px, 3vw, 40px);
  margin-bottom: var(--space-4);
  font-weight: 800;
  letter-spacing: -0.5px;
  position: relative;
}

.cta p {
  font-size: 17px;
  opacity: 0.9;
  margin-bottom: var(--space-10);
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
  position: relative;
}

.cta-btn {
  display: inline-block;
  padding: var(--space-4) var(--space-10);
  background: var(--white);
  color: var(--green-700);
  border-radius: var(--radius-full);
  font-size: 17px;
  font-weight: 700;
  text-decoration: none;
  transition: all var(--transition-base);
  position: relative;
  box-shadow: var(--shadow-lg);
}

.cta-btn:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-2xl);
}

/* ===== FOOTER ===== */
.footer {
  background: var(--gray-950);
  padding: var(--space-16) 5% var(--space-8);
  color: var(--gray-400);
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: var(--space-12);
}

.footer h4 {
  color: var(--white);
  font-size: 16px;
  margin-bottom: var(--space-5);
  font-weight: 700;
}

.footer p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--gray-500);
}

.footer a {
  color: var(--gray-400);
  text-decoration: none;
  display: block;
  font-size: 14px;
  margin-bottom: var(--space-2);
  padding: var(--space-1) 0;
  transition: color var(--transition-fast), transform var(--transition-fast);
}

.footer a:hover {
  color: var(--green-400);
  transform: translateX(4px);
}

.footer-bottom {
  max-width: 1200px;
  margin: var(--space-10) auto 0;
  padding-top: var(--space-6);
  border-top: 1px solid var(--gray-800);
  text-align: center;
  font-size: 13px;
  color: var(--gray-600);
}

/* ===== 返回顶部 ===== */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 48px;
  height: 48px;
  background: var(--white);
  color: var(--green-600);
  border: 1px solid var(--border);
  border-radius: 50%;
  font-size: 20px;
  cursor: pointer;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all var(--transition-base);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
}

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

.back-to-top:hover {
  background: var(--green-50);
  border-color: var(--green-300);
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

/* ===== 入场动画 ===== */
.page-enter {
  opacity: 0;
  transform: translateY(24px);
}

.page-enter.in-view {
  animation: fadeUp 0.7s var(--ease-out-expo) both;
}

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* 交错动画 */
.stagger-1 { animation-delay: 0.06s; }
.stagger-2 { animation-delay: 0.12s; }
.stagger-3 { animation-delay: 0.18s; }
.stagger-4 { animation-delay: 0.24s; }
.stagger-5 { animation-delay: 0.30s; }
.stagger-6 { animation-delay: 0.36s; }

/* ===== 按钮涟漪 ===== */
.btn-ripple {
  position: relative;
  overflow: hidden;
}

.btn-ripple::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.35);
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s, opacity 0.6s;
  opacity: 0;
}

.btn-ripple:active::after {
  width: 300px;
  height: 300px;
  opacity: 0;
  transition: 0s;
}

/* 按钮点击反馈 */
.hero-btn:active,
.product-btn:active,
.pricing-btn:active,
.cta-btn:active {
  transform: scale(0.97) !important;
  transition: transform 0.1s ease !important;
}

/* ===== 卡片光泽 ===== */
.card-gloss {
  position: relative;
  overflow: hidden;
}

.card-gloss::after {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: linear-gradient(
    135deg,
    transparent 40%,
    rgba(255, 255, 255, 0.12) 45%,
    rgba(255, 255, 255, 0.25) 50%,
    rgba(255, 255, 255, 0.12) 55%,
    transparent 60%
  );
  transform: translateX(-100%) translateY(-100%);
  transition: transform 0.8s ease;
  pointer-events: none;
  z-index: 2;
}

.card-gloss:hover::after {
  transform: translateX(20%) translateY(20%);
}

/* ===== 骨架屏 ===== */
.skeleton {
  background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius-sm);
}

@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* ===== 面包屑 ===== */
.breadcrumb {
  padding: 0 5%;
  max-width: 1200px;
  margin: 0 auto;
  padding-top: 88px;
}

.breadcrumb-list {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  list-style: none;
  font-size: 14px;
  color: var(--text-muted);
}

.breadcrumb-list a {
  color: var(--text-muted);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.breadcrumb-list a:hover {
  color: var(--green-600);
}

.breadcrumb-list .separator {
  margin: 0 var(--space-1);
  color: var(--gray-300);
}

.breadcrumb-list .current {
  color: var(--text);
  font-weight: 500;
}

/* ===== PAGE HEADER ===== */
.page-header {
  padding: 140px 5% 80px;
  background: linear-gradient(180deg, var(--white), var(--green-50));
  text-align: center;
  position: relative;
}

.page-header::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--green-200), transparent);
}

.page-header h1 {
  font-size: clamp(32px, 4vw, 48px);
  font-weight: 800;
  margin-bottom: var(--space-4);
  letter-spacing: -1px;
  color: var(--gray-950);
}

.page-header p {
  font-size: 17px;
  color: var(--text-secondary);
  max-width: 640px;
  margin: 0 auto;
  line-height: 1.8;
}

/* ===== 功能区 ===== */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-6);
  margin-top: var(--space-6);
}

.feature-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: var(--space-7);
  transition: all var(--transition-slow);
  box-shadow: var(--shadow-card);
  text-align: center;
}

.feature-card:hover {
  border-color: var(--green-200);
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
}

.feature-card .tag {
  display: inline-block;
  background: var(--green-50);
  color: var(--green-700);
  font-size: 12px;
  font-weight: 600;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-4);
}

.feature-card h4 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: var(--space-3);
  color: var(--gray-900);
}

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

.section-desc {
  text-align: center;
  color: var(--text-secondary);
  font-size: 16px;
  max-width: 700px;
  margin: 0 auto var(--space-5);
  line-height: 1.8;
}

/* ===== 下载页 ===== */
.download-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: var(--space-6);
  margin-top: var(--space-6);
}

.download-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  transition: all var(--transition-slow);
  position: relative;
  box-shadow: var(--shadow-card);
}

.download-card:hover {
  border-color: var(--green-200);
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
}

.download-card.featured {
  border-color: var(--green-300);
  box-shadow: var(--shadow-green);
}

.download-card.featured::before {
  content: '推荐';
  position: absolute;
  top: -12px;
  right: var(--space-6);
  background: linear-gradient(135deg, var(--green-500), var(--green-700));
  color: var(--white);
  padding: var(--space-1) var(--space-4);
  border-radius: var(--radius-full);
  font-size: 12px;
  font-weight: 600;
}

.download-icon {
  font-size: 48px;
  text-align: center;
}

.download-info {
  flex: 1;
}

.download-info h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: var(--space-4);
  color: var(--gray-900);
}

.download-meta {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-5);
  flex-wrap: wrap;
}

.download-tag {
  display: inline-block;
  background: var(--green-50);
  color: var(--green-700);
  font-size: 12px;
  font-weight: 600;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
}

.download-price {
  font-size: 18px;
  font-weight: 700;
  color: var(--green-600);
}

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

.download-info p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-5);
}

.download-features {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-6);
}

.download-features span {
  font-size: 12px;
  color: var(--text-secondary);
  background: var(--gray-100);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-sm);
}

.download-btn {
  display: block;
  width: 100%;
  padding: var(--space-4) var(--space-6);
  background: var(--primary);
  color: var(--white);
  border-radius: var(--radius-full);
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  text-align: center;
  transition: all var(--transition-base);
  margin-top: auto;
}

.download-btn:hover {
  background: var(--primary-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-green);
}

/* ===== 评价（旧，保留兼容） ===== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--space-6);
}

.review-card {
  background: var(--card);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  border: 1px solid var(--border);
  transition: all var(--transition-slow);
  box-shadow: var(--shadow-card);
}

.review-card:hover {
  border-color: var(--green-200);
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-4px);
}

.review-stars {
  color: var(--green-600);
  font-size: 14px;
  margin-bottom: var(--space-5);
  font-weight: 600;
}

.review-text {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: var(--space-6);
}

.review-author {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.review-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--green-100), var(--green-200));
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: var(--green-700);
  font-size: 18px;
  flex-shrink: 0;
}

.review-name {
  font-weight: 600;
  font-size: 15px;
  color: var(--gray-900);
}

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

/* ===== 关于页 ===== */
.about-intro {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: var(--space-12);
  align-items: center;
}

.about-intro p {
  font-size: 16px;
  color: var(--text-secondary);
  line-height: 1.9;
  margin-bottom: var(--space-4);
}

.about-stats {
  display: flex;
  gap: var(--space-10);
  margin-top: var(--space-8);
}

.about-stat .num {
  font-size: 36px;
  font-weight: 800;
  color: var(--green-600);
  letter-spacing: -1px;
}

.about-stat .label {
  font-size: 14px;
  color: var(--text-muted);
  margin-top: var(--space-1);
}

.section-title.left {
  text-align: left;
}

.values-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--space-6);
}

.value-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  text-align: center;
  transition: all var(--transition-slow);
  box-shadow: var(--shadow-card);
}

.value-card:hover {
  border-color: var(--green-200);
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
}

.value-card .icon {
  font-size: 40px;
  margin-bottom: var(--space-4);
}

.value-card h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: var(--space-3);
  color: var(--gray-900);
}

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

.timeline {
  max-width: 800px;
  margin: 0 auto;
  position: relative;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 24px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--green-200), var(--green-400), var(--green-200));
}

.timeline-item {
  position: relative;
  padding-left: 72px;
  margin-bottom: var(--space-10);
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: 17px;
  top: 6px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--green-500);
  border: 3px solid var(--white);
  box-shadow: 0 0 0 3px var(--green-200);
}

.timeline-date {
  font-size: 13px;
  color: var(--green-600);
  font-weight: 700;
  margin-bottom: var(--space-2);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.timeline-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: var(--space-2);
  color: var(--gray-900);
}

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

.team-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-6);
  max-width: 1000px;
  margin: 0 auto;
}

.team-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: var(--space-8) var(--space-6);
  text-align: center;
  transition: all var(--transition-slow);
  box-shadow: var(--shadow-card);
}

.team-card:hover {
  border-color: var(--green-200);
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
}

.team-avatar {
  font-size: 56px;
  margin-bottom: var(--space-4);
}

.team-name {
  font-size: 18px;
  font-weight: 700;
  color: var(--gray-900);
}

.team-role {
  font-size: 13px;
  color: var(--green-600);
  margin-bottom: var(--space-3);
  font-weight: 600;
}

.team-desc {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ===== 页面加载动画 ===== */
.page-loader {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--white);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  transition: opacity 0.5s, visibility 0.5s;
}

.page-loader.hidden {
  opacity: 0;
  visibility: hidden;
}

.loader-spinner {
  width: 44px;
  height: 44px;
  border: 3px solid var(--green-100);
  border-top-color: var(--green-500);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* ===== QQ 群弹窗 ===== */
.qq-modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.45);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
}

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

.qq-modal {
  background: var(--white);
  border-radius: var(--radius-2xl);
  padding: var(--space-10);
  max-width: 420px;
  width: 90%;
  text-align: center;
  box-shadow: var(--shadow-2xl);
  transform: scale(0.9) translateY(20px);
  transition: transform 0.4s var(--ease-out-back);
}

.qq-modal-overlay.active .qq-modal {
  transform: scale(1) translateY(0);
}

.qq-modal-icon {
  font-size: 48px;
  margin-bottom: var(--space-4);
}

.qq-modal h3 {
  font-size: 22px;
  font-weight: 800;
  color: var(--gray-900);
  margin-bottom: var(--space-3);
}

.qq-modal p {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-6);
}

.qq-modal .qq-number {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  background: var(--green-50);
  border: 1.5px solid var(--green-200);
  border-radius: var(--radius-lg);
  padding: var(--space-4) var(--space-6);
  margin-bottom: var(--space-6);
  cursor: pointer;
  transition: all var(--transition-base);
}

.qq-modal .qq-number:hover {
  background: var(--green-100);
  border-color: var(--green-400);
  transform: scale(1.02);
}

.qq-modal .qq-number .qq-label {
  font-size: 13px;
  color: var(--text-muted);
  font-weight: 500;
}

.qq-modal .qq-number .qq-val {
  font-size: 24px;
  font-weight: 800;
  color: var(--green-700);
  letter-spacing: 1px;
  font-variant-numeric: tabular-nums;
}

.qq-modal .qq-hint {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: var(--space-5);
}

.qq-modal-close {
  display: inline-block;
  padding: var(--space-3) var(--space-8);
  background: var(--primary);
  color: var(--white);
  border: none;
  border-radius: var(--radius-full);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-base);
}

.qq-modal-close:hover {
  background: var(--primary-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-green);
}

/* ===== 增强滚动条 ===== */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--gray-100);
}

::-webkit-scrollbar-thumb {
  background: var(--gray-300);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--gray-400);
}

/* ===== 页面入场 ===== */
body {
  animation: pageEnter 0.5s var(--ease-out-expo) both;
}

@keyframes pageEnter {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ===== 增强统计数字 ===== */
.stat-item {
  transition: transform var(--transition-base);
}

.stat-item:hover {
  transform: translateY(-4px);
}

.stat-item:hover .stat-num {
  color: var(--green-600);
  transition: color var(--transition-base);
}

/* ===== 光标跟随光晕 ===== */
.cursor-glow {
  position: fixed;
  width: 300px;
  height: 300px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(34, 197, 94, 0.04) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
  transform: translate(-50%, -50%);
  transition: opacity 0.3s;
  opacity: 0;
}

body:hover .cursor-glow {
  opacity: 1;
}

/* ===== 价格档表 ===== */
.tier-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  margin-top: var(--space-5);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
}

.tier-table th,
.tier-table td {
  padding: var(--space-4) var(--space-5);
  text-align: center;
  border-bottom: 1px solid var(--border);
}

.tier-table th {
  background: var(--green-50);
  color: var(--green-800);
  font-weight: 600;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.tier-table tr:last-child td {
  border-bottom: none;
}

.tier-table tr:hover td {
  background: var(--gray-50);
}

.tier-table td:first-child {
  text-align: left;
  font-weight: 600;
  color: var(--text);
}

.tier-table .tier-buy {
  color: var(--green-600);
  font-weight: 600;
  text-decoration: none;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.tier-table .tier-buy:hover {
  background: var(--green-50);
  color: var(--green-700);
}

/* ===== 移动端触摸优化 ===== */
@media (hover: none) and (pointer: coarse) {
  /* 触摸设备：去掉 hover 阴影，用 active 替代 */
  .card-gloss::after {
    display: none;
  }

  .product-card:hover,
  .pricing-card:hover,
  .video-card:hover,
  .feature-card:hover,
  .download-card:hover,
  .review-card:hover,
  .value-card:hover,
  .team-card:hover,
  .loop-node:hover {
    transform: none;
    box-shadow: var(--shadow-card);
  }

  .product-card:active,
  .pricing-card:active,
  .video-card:active,
  .feature-card:active,
  .download-card:active,
  .review-card:active,
  .value-card:active,
  .team-card:active,
  .loop-node:active {
    transform: scale(0.98);
    box-shadow: var(--shadow-card-hover);
    transition: transform 0.1s ease;
  }

  /* 按钮触摸反馈 */
  .hero-btn:hover,
  .product-btn:hover,
  .pricing-btn:hover,
  .cta-btn:hover,
  .download-btn:hover {
    transform: none;
    box-shadow: none;
  }
}

/* 安全区域（刘海屏） */
@supports (padding: env(safe-area-inset-bottom)) {
  .back-to-top {
    bottom: calc(76px + env(safe-area-inset-bottom));
    right: calc(16px + env(safe-area-inset-right));
  }

  .footer {
    padding-bottom: calc(var(--space-10) + env(safe-area-inset-bottom));
  }

  .nav {
    padding-top: env(safe-area-inset-top);
  }

  .mobile-bar {
    padding-bottom: env(safe-area-inset-bottom);
  }
}

/* ===== 移动端底部导航栏 ===== */
.mobile-bar {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-top: 1px solid var(--border);
  z-index: 999;
  padding: var(--space-1) 0;
  box-shadow: 0 -2px 20px rgba(0,0,0,0.06);
}

@media (max-width: 768px) {
  .mobile-bar {
    display: flex;
    justify-content: space-around;
    align-items: center;
  }

  /* 底部栏占位 */
  body {
    padding-bottom: 68px;
  }

  .back-to-top {
    bottom: 80px;
    right: 16px;
  }
}

.mobile-bar-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: var(--space-1) var(--space-2);
  text-decoration: none;
  color: var(--text-muted);
  font-size: 11px;
  font-weight: 500;
  transition: color var(--transition-fast);
  -webkit-tap-highlight-color: transparent;
  min-width: 48px;
  position: relative;
}

.mobile-bar-item.active {
  color: var(--green-600);
}

.mobile-bar-item:active {
  transform: scale(0.9);
  transition: transform 0.1s ease;
}

.mobile-bar-item svg {
  transition: transform var(--transition-fast);
}

.mobile-bar-item:active svg {
  transform: scale(0.85);
}

/* 中间购买按钮高亮 */
.mobile-bar-primary {
  position: relative;
}

.mobile-bar-primary::before {
  content: '';
  position: absolute;
  top: -2px;
  left: 50%;
  transform: translateX(-50%);
  width: 32px;
  height: 32px;
  background: var(--green-500);
  border-radius: 50%;
  opacity: 0.1;
  animation: barPulse 2s ease-in-out infinite;
}

.mobile-bar-primary svg {
  color: var(--green-600);
}

@keyframes barPulse {
  0%, 100% { transform: translateX(-50%) scale(1); opacity: 0.1; }
  50% { transform: translateX(-50%) scale(1.3); opacity: 0; }
}

/* ===== 减少动效偏好 ===== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .page-enter {
    opacity: 1;
    transform: none;
  }

  .hero-particles {
    display: none;
  }

  .cursor-glow {
    display: none;
  }

  .scroll-progress {
    display: none;
  }

  .card-gloss::after {
    display: none;
  }
}

/* ===== 焦点环 ===== */
.focus-ring {
  transition: box-shadow 0.2s ease;
}

.focus-ring:focus-visible {
  outline: 2px solid var(--green-400);
  outline-offset: 2px;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 400px;
  }

  .pricing-card.featured {
    transform: none;
  }

  .pricing-card.featured:hover {
    transform: translateY(-6px);
  }

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

@media (max-width: 768px) {
  /* 导航 */
  .nav-links {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: var(--space-4) 5%;
    gap: var(--space-1);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-lg);
    animation: menuSlide 0.3s var(--ease-out-expo);
  }

  @keyframes menuSlide {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
  }

  .nav-links.show {
    display: flex;
  }

  .nav-links a {
    font-size: 16px;
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-md);
  }

  .menu-toggle {
    display: block;
  }

  /* Hero */
  .hero {
    min-height: auto;
    padding: 100px 5% 60px;
  }

  .hero h1 {
    font-size: 32px;
    letter-spacing: -0.5px;
  }

  .hero p {
    font-size: 15px;
    max-width: 100%;
  }

  .hero-btn {
    padding: var(--space-3) var(--space-7);
    font-size: 15px;
  }

  .hero-btns {
    flex-direction: column;
    align-items: stretch;
  }

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

  /* 统计数字 */
  .stats-row {
    gap: var(--space-6);
    flex-wrap: wrap;
    justify-content: center;
  }

  .stat-num {
    font-size: 28px;
  }

  .stat-label {
    font-size: 12px;
  }

  /* Section */
  .section {
    padding: var(--space-12) 5%;
  }

  .section-alt {
    padding: var(--space-12) 5%;
  }

  .section-title {
    font-size: 26px;
  }

  .section-sub {
    margin-bottom: var(--space-8);
    font-size: 15px;
  }

  /* 产品卡 */
  .product-grid {
    grid-template-columns: 1fr;
    gap: var(--space-4);
  }

  .product-card {
    padding: var(--space-6);
  }

  .product-icon {
    font-size: 32px;
  }

  .product-card h3 {
    font-size: 18px;
  }

  /* 闭环图 */
  .loop {
    flex-direction: column;
    gap: var(--space-3);
    padding: var(--space-4);
  }

  .loop-node {
    width: 100%;
    min-width: unset;
    padding: var(--space-4) var(--space-5);
  }

  .loop-arrow {
    transform: rotate(90deg);
    font-size: 24px;
  }

  /* 定价 */
  .pricing-grid {
    gap: var(--space-4);
  }

  .pricing-card {
    padding: var(--space-7) var(--space-6);
  }

  .pricing-price {
    font-size: 36px;
  }

  /* 视频卡 */
  .video-grid {
    grid-template-columns: 1fr;
    gap: var(--space-4);
  }

  .video-thumb {
    height: 160px;
  }

  .video-info {
    padding: var(--space-4) var(--space-5);
  }

  .video-title {
    font-size: 15px;
  }

  /* FAQ */
  .faq-q {
    padding: var(--space-4) var(--space-5);
    font-size: 14px;
  }

  .faq-a {
    padding: 0 var(--space-5);
  }

  .faq-item.open .faq-a {
    padding: 0 var(--space-5) var(--space-4);
  }

  /* CTA */
  .cta {
    padding: var(--space-14) 5%;
  }

  .cta h2 {
    font-size: 26px;
  }

  .cta p {
    font-size: 15px;
    margin-bottom: var(--space-8);
  }

  .cta-btn {
    padding: var(--space-3) var(--space-8);
    font-size: 15px;
    width: 100%;
    text-align: center;
  }

  /* Footer */
  .footer {
    padding: var(--space-10) 5% var(--space-6);
  }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }

  .footer h4 {
    margin-bottom: var(--space-3);
  }

  /* 返回顶部 */
  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 44px;
    height: 44px;
    font-size: 18px;
  }

  /* QQ弹窗 */
  .qq-modal {
    padding: var(--space-6);
    margin: var(--space-4);
  }

  .qq-modal h3 {
    font-size: 20px;
  }

  .qq-modal .qq-number .qq-val {
    font-size: 20px;
  }

  /* 光标光晕 */
  .cursor-glow {
    display: none;
  }

  /* 页面头部 */
  .page-header {
    padding: 100px 5% 60px;
  }

  .page-header h1 {
    font-size: 28px;
  }

  .page-header p {
    font-size: 15px;
  }

  /* 功能卡 */
  .feature-grid {
    grid-template-columns: 1fr;
    gap: var(--space-4);
  }

  .feature-card {
    padding: var(--space-5);
  }

  /* 下载卡 */
  .download-grid {
    grid-template-columns: 1fr;
    gap: var(--space-4);
  }

  .download-card {
    padding: var(--space-6);
  }

  /* 时间线 */
  .timeline {
    padding-left: 0;
  }

  .timeline-item {
    padding-left: 52px;
  }

  .timeline::before {
    left: 18px;
  }

  .timeline-item::before {
    left: 11px;
    width: 14px;
    height: 14px;
  }

  /* 评价卡 */
  .reviews-grid {
    grid-template-columns: 1fr;
    gap: var(--space-4);
  }

  .review-card {
    padding: var(--space-6);
  }

  /* 关于 */
  .about-intro {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }

  .about-stats {
    flex-wrap: wrap;
    gap: var(--space-6);
  }

  .about-stat .num {
    font-size: 28px;
  }

  .values-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-4);
  }

  .value-card {
    padding: var(--space-6);
  }

  .value-card .icon {
    font-size: 32px;
  }

  .team-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-4);
  }

  /* 价格档表 */
  .tier-table {
    font-size: 12px;
  }

  .tier-table th,
  .tier-table td {
    padding: var(--space-2) var(--space-3);
  }

  /* 面包屑 */
  .breadcrumb {
    padding-top: 80px;
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 28px;
  }

  .section-title {
    font-size: 22px;
  }

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

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

  .stats-row {
    gap: var(--space-4);
  }

  .stat-item {
    min-width: 80px;
  }

  .stat-num {
    font-size: 24px;
  }

  .loop-node .loop-icon {
    font-size: 28px;
  }

  .loop-node .loop-title {
    font-size: 14px;
  }

  .pricing-card {
    padding: var(--space-6) var(--space-5);
  }

  .pricing-price {
    font-size: 32px;
  }

  .pricing-features li {
    font-size: 13px;
  }

  .video-thumb {
    height: 140px;
  }

  .qq-modal-icon {
    font-size: 36px;
  }

  .qq-modal h3 {
    font-size: 18px;
  }

  .qq-modal p {
    font-size: 14px;
  }
}