/* ==========================================================================
   算力胶囊 - AI-Capsule 核心样式表
   采用暗黑科技风，结合玻璃拟态、霓虹流光渐变与优雅微动效。
   ========================================================================== */

/* 1. 设计系统与变量定义 */
:root {
  /* 基础配色 */
  --bg-color: #05080e;
  --bg-darker: #020408;
  --text-color: #f8fafc;
  --text-muted: #94a3b8;
  --text-dark: #64748b;
  
  /* 品牌科幻色彩 */
  --primary-color: #8b5cf6;     /* 极客紫 */
  --primary-glow: rgba(139, 92, 246, 0.4);
  --accent-color: #06b6d4;      /* 极光蓝 */
  --accent-glow: rgba(6, 182, 212, 0.4);
  --pink-color: #ec4899;        /* 胶囊粉 */
  --pink-glow: rgba(236, 72, 153, 0.4);
  
  /* 卡片与组件质感 */
  --card-bg: rgba(10, 17, 32, 0.6);
  --card-bg-hover: rgba(16, 26, 48, 0.85);
  --border-color: rgba(255, 255, 255, 0.06);
  --border-hover: rgba(255, 255, 255, 0.15);
  
  /* 功能色彩 */
  --success: #10b981;
  --success-glow: rgba(16, 185, 129, 0.3);
  --error: #ef4444;
  --error-glow: rgba(239, 68, 68, 0.3);
  
  /* 字体系统 */
  --font-sans: 'Outfit', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-mono: SFMono-Regular, Consolas, 'Liberation Mono', Menlo, monospace;
  
  /* 过渡动画 */
  --transition-smooth: all 0.35s cubic-bezier(0.25, 0.8, 0.25, 1);
  --transition-fast: all 0.2s ease;
  
  /* 阴影 */
  --neon-shadow: 0 0 20px var(--primary-glow);
  --accent-neon: 0 0 20px var(--accent-glow);
}

/* 2. 重置与基础样式 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: var(--font-sans);
  background-color: var(--bg-color);
  color: var(--text-color);
  scroll-behavior: smooth;
  line-height: 1.6;
}

body {
  overflow-x: hidden;
  position: relative;
}

/* 隐藏滚动条但保留滚动能力 */
::-webkit-scrollbar {
  width: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg-darker);
}
::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.1);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.25);
}

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

button {
  background: none;
  border: none;
  font-family: inherit;
  cursor: pointer;
}

/* 3. 布局网格 */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* 4. 背景氛围微光（Glow Elements） */
.bg-glow {
  position: absolute;
  width: 60vw;
  height: 60vw;
  max-width: 800px;
  max-height: 800px;
  border-radius: 50%;
  filter: blur(130px);
  pointer-events: none;
  z-index: -1;
  opacity: 0.15;
  mix-blend-mode: screen;
}

.bg-glow-1 {
  top: -10%;
  right: -10%;
  background: var(--primary-color);
  animation: glow-float 20s infinite alternate;
}

.bg-glow-2 {
  top: 30%;
  left: -20%;
  background: var(--accent-color);
  animation: glow-float 25s infinite alternate-reverse;
}

.bg-glow-3 {
  bottom: 5%;
  right: -10%;
  background: var(--pink-color);
  animation: glow-float 22s infinite alternate;
}

@keyframes glow-float {
  0% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(50px, 30px) scale(1.1); }
  100% { transform: translate(-30px, -50px) scale(0.9); }
}

/* 5. 按钮系统 (Button Styles) */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  border-radius: 12px;
  transition: var(--transition-smooth);
  cursor: pointer;
  position: relative;
  overflow: hidden;
  z-index: 1;
}

.btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  transition: var(--transition-smooth);
  opacity: 0;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-color), var(--pink-color));
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: 0 4px 15px var(--primary-glow);
}

.btn-primary::before {
  background: linear-gradient(135deg, var(--accent-color), var(--primary-color));
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 22px rgba(139, 92, 246, 0.6), 0 0 30px rgba(236, 72, 153, 0.3);
}

.btn-primary:hover::before {
  opacity: 1;
}

.btn-secondary {
  background: var(--card-bg);
  color: #fff;
  border: 1px solid var(--border-color);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-2px);
}

.btn-glow-border::after {
  content: '';
  position: absolute;
  top: -1px; left: -1px; right: -1px; bottom: -1px;
  border-radius: inherit;
  background: linear-gradient(135deg, var(--accent-color), var(--primary-color), var(--pink-color));
  z-index: -2;
  opacity: 0.5;
  transition: var(--transition-smooth);
}

.btn-glow-border:hover::after {
  opacity: 1;
  filter: blur(4px);
}

.btn-sm {
  padding: 8px 16px;
  font-size: 0.875rem;
}

.btn-md {
  padding: 12px 28px;
  font-size: 1rem;
}

.btn-lg {
  padding: 16px 40px;
  font-size: 1.125rem;
  border-radius: 14px;
}

.btn-full {
  width: 100%;
  padding: 14px 20px;
}

/* 6. Typography 渐变字体及排版 */
.gradient-text {
  background: linear-gradient(135deg, var(--accent-color) 0%, var(--primary-color) 50%, var(--pink-color) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-header {
  text-align: center;
  margin-bottom: 56px;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  margin-bottom: 16px;
  font-family: 'Outfit', sans-serif;
  position: relative;
  display: inline-block;
}

.section-desc {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto;
}

/* 7. Header 头部导航 */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 80px;
  background: rgba(5, 8, 14, 0.7);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border-bottom: 1px solid var(--border-color);
  z-index: 100;
  transition: var(--transition-smooth);
}

.header.scrolled {
  height: 68px;
  background: rgba(2, 4, 8, 0.85);
  box-shadow: 0 10px 30px rgba(0,0,0,0.3);
}

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

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

.logo-img {
  width: 42px;
  height: 42px;
  filter: drop-shadow(0 0 8px var(--accent-glow));
  transition: var(--transition-smooth);
}

.logo:hover .logo-img {
  transform: rotate(-15deg) scale(1.05);
}

.logo-text {
  display: flex;
  flex-direction: column;
}

.logo-title {
  font-size: 1.15rem;
  font-weight: 800;
  letter-spacing: 0.5px;
  background: linear-gradient(135deg, #fff, #b4c6ef);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  font-family: 'Outfit', sans-serif;
}

.logo-subtitle {
  font-size: 0.7rem;
  color: var(--accent-color);
  letter-spacing: 1px;
  font-weight: 500;
}

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

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-muted);
  position: relative;
  padding: 6px 0;
}

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-color), var(--primary-color));
  transition: var(--transition-smooth);
  border-radius: 2px;
}

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

.mobile-nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 24px;
  height: 18px;
  z-index: 110;
}

.mobile-nav-toggle .bar {
  height: 2px;
  width: 100%;
  background-color: var(--text-color);
  border-radius: 2px;
  transition: var(--transition-smooth);
}

/* 8. Hero 首屏样式 */
.hero-section {
  padding-top: 160px;
  padding-bottom: 80px;
  position: relative;
}

.hero-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.badge-capsule {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  border-radius: 30px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 24px;
  backdrop-filter: blur(8px);
}

.badge-icon {
  color: #fbbf24;
  filter: drop-shadow(0 0 4px rgba(251, 191, 36, 0.6));
}

.hero-title {
  font-size: 4rem;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -1.5px;
  margin-bottom: 24px;
  font-family: 'Outfit', sans-serif;
}

.hero-desc {
  font-size: 1.25rem;
  color: var(--text-muted);
  max-width: 650px;
  margin-bottom: 56px;
  line-height: 1.7;
}

.hero-desc strong {
  color: var(--text-color);
}

/* 3D 卡片网格 */
.hero-cards-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  width: 100%;
  perspective: 1000px;
}

.model-card {
  position: relative;
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 24px;
  overflow: hidden;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  transition: transform 0.1s ease, border-color 0.3s ease, box-shadow 0.3s ease;
  transform-style: preserve-3d;
  height: 100%;
}

.model-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  border-radius: inherit;
  padding: 1.5px;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.05), rgba(255, 255, 255, 0.01));
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
}

.model-card:hover {
  background: var(--card-bg-hover);
  border-color: rgba(255, 255, 255, 0.15);
}

.card-glow {
  position: absolute;
  top: 0; left: 0; width: 100%; height: 100%;
  pointer-events: none;
  background: radial-gradient(circle 200px at var(--mouse-x, 50%) var(--mouse-y, 50%), rgba(255, 255, 255, 0.08), transparent 80%);
  z-index: 1;
}

.card-content {
  padding: 40px 32px;
  display: flex;
  flex-direction: column;
  align-items: center;
  transform: translateZ(30px); /* 3D 浮动感 */
  z-index: 2;
}

.model-logo-wrapper {
  width: 72px;
  height: 72px;
  border-radius: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  position: relative;
}

.model-logo {
  width: 38px;
  height: 38px;
  transition: transform 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.model-card:hover .model-logo {
  transform: scale(1.1) rotate(5deg);
}

.model-name {
  font-family: 'Outfit', sans-serif;
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.model-tier {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 28px;
  letter-spacing: 1px;
}

.model-features {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 36px;
  width: 100%;
}

.model-features span {
  font-size: 0.875rem;
  color: var(--text-muted);
  text-align: center;
  position: relative;
}

.model-btn {
  width: 100%;
  padding: 12px 20px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  font-weight: 600;
  font-size: 0.9rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: var(--transition-smooth);
}

.arrow-icon {
  width: 16px;
  height: 16px;
  transition: transform 0.3s ease;
}

.model-btn:hover {
  background: #fff;
  color: var(--bg-color);
  transform: translateY(-2px);
  box-shadow: 0 10px 20px rgba(255, 255, 255, 0.1);
}

.model-btn:hover .arrow-icon {
  transform: translateX(4px);
}

/* 针对不同 AI 卡片的流光色彩偏好 */
.card-chatgpt .model-logo-wrapper {
  background: rgba(16, 185, 129, 0.1);
  color: #10b981;
  box-shadow: 0 0 15px rgba(16, 185, 129, 0.15);
}
.card-chatgpt:hover {
  box-shadow: 0 15px 40px rgba(16, 185, 129, 0.15);
  border-color: rgba(16, 185, 129, 0.4);
}

.card-claude .model-logo-wrapper {
  background: rgba(249, 115, 22, 0.1);
  color: #f97316;
  box-shadow: 0 0 15px rgba(249, 115, 22, 0.15);
}
.card-claude:hover {
  box-shadow: 0 15px 40px rgba(249, 115, 22, 0.12);
  border-color: rgba(249, 115, 22, 0.35);
}

.card-gemini .model-logo-wrapper {
  background: rgba(6, 182, 212, 0.1);
  color: #06b6d4;
  box-shadow: 0 0 15px rgba(6, 182, 212, 0.15);
}
.card-gemini:hover {
  box-shadow: 0 15px 40px rgba(6, 182, 212, 0.15);
  border-color: rgba(6, 182, 212, 0.4);
}

/* 9. Contrast Area 痛点与方案对比 */
.troubles-section {
  padding: 100px 0;
  position: relative;
  background: rgba(2, 4, 8, 0.4);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.contrast-wrapper {
  display: flex;
  align-items: stretch;
  gap: 24px;
  position: relative;
}

.contrast-box {
  flex: 1;
  background: rgba(10, 17, 32, 0.4);
  border: 1px solid var(--border-color);
  border-radius: 28px;
  padding: 44px;
  backdrop-filter: blur(12px);
  display: flex;
  flex-direction: column;
}

.painpoints-box {
  background: linear-gradient(180deg, rgba(239, 68, 68, 0.02) 0%, rgba(10, 17, 32, 0.4) 100%);
  border-color: rgba(239, 68, 68, 0.08);
}
.painpoints-box:hover {
  border-color: rgba(239, 68, 68, 0.15);
  box-shadow: 0 15px 40px rgba(239, 68, 68, 0.03);
}

.solutions-box {
  background: linear-gradient(180deg, rgba(6, 182, 212, 0.03) 0%, rgba(10, 17, 32, 0.4) 100%);
  border-color: rgba(6, 182, 212, 0.12);
  box-shadow: 0 10px 30px rgba(6, 182, 212, 0.03);
}
.solutions-box:hover {
  border-color: rgba(6, 182, 212, 0.3);
  box-shadow: 0 15px 40px rgba(6, 182, 212, 0.08);
}

.contrast-box-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 32px;
  font-family: 'Outfit', sans-serif;
  letter-spacing: -0.5px;
}

.painpoints-box .contrast-box-title {
  color: #ef4444;
}

.solutions-box .contrast-box-title {
  color: var(--accent-color);
}

.contrast-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.contrast-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
}

.icon-indicator {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  font-size: 0.75rem;
  font-weight: 800;
  flex-shrink: 0;
  margin-top: 3px;
}

.icon-indicator.err {
  background: rgba(239, 68, 68, 0.15);
  color: #ef4444;
  border: 1px solid rgba(239, 68, 68, 0.3);
}

.icon-indicator.ok {
  background: rgba(6, 182, 212, 0.15);
  color: var(--accent-color);
  border: 1px solid rgba(6, 182, 212, 0.3);
  box-shadow: 0 0 8px rgba(6, 182, 212, 0.3);
}

.contrast-text h4 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.contrast-text p {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* 对比箭头 */
.contrast-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 5;
}

.arrow-pill {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--bg-color);
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 15px rgba(0,0,0,0.5);
}

.arrow-icon-neon {
  font-size: 1.1rem;
  font-weight: bold;
  background: linear-gradient(135deg, var(--accent-color), var(--primary-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: pulse-arrow 2s infinite;
}

@keyframes pulse-arrow {
  0% { transform: scale(1); opacity: 0.8; }
  50% { transform: scale(1.1); opacity: 1; filter: drop-shadow(0 0 5px var(--accent-glow)); }
  100% { transform: scale(1); opacity: 0.8; }
}

.troubles-bottom {
  text-align: center;
  margin-top: 48px;
}

.troubles-bottom .tagline {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-color);
  letter-spacing: 0.5px;
}

/* 10. Pricing 订阅定价卡片 */
.products-section {
  padding: 100px 0;
  position: relative;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  align-items: stretch;
}

.price-card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 28px;
  padding: 48px 36px;
  backdrop-filter: blur(12px);
  position: relative;
  display: flex;
  flex-direction: column;
  transition: var(--transition-smooth);
}

.price-card:hover {
  background: var(--card-bg-hover);
  border-color: rgba(255, 255, 255, 0.12);
  transform: translateY(-4px);
}

/* 突出卡片风格 */
.highlight-card {
  border-color: rgba(139, 92, 246, 0.3);
  box-shadow: 0 15px 40px rgba(139, 92, 246, 0.08);
  background: linear-gradient(180deg, rgba(139, 92, 246, 0.03) 0%, rgba(10, 17, 32, 0.6) 100%);
}

.highlight-card:hover {
  border-color: rgba(139, 92, 246, 0.5);
  box-shadow: 0 20px 48px rgba(139, 92, 246, 0.15), 0 0 30px rgba(139, 92, 246, 0.05);
}

.badge-hot {
  position: absolute;
  top: 24px;
  right: 28px;
  background: linear-gradient(135deg, var(--accent-color), var(--primary-color));
  color: #fff;
  padding: 6px 14px;
  border-radius: 30px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  box-shadow: 0 0 10px rgba(6, 182, 212, 0.2);
}

.price-card:nth-child(1) .badge-hot {
  background: rgba(16, 185, 129, 0.15);
  color: #10b981;
  border: 1px solid rgba(16, 185, 129, 0.3);
  box-shadow: none;
}

.price-header {
  margin-bottom: 28px;
}

.price-icon {
  font-size: 2.2rem;
  display: block;
  margin-bottom: 18px;
  filter: drop-shadow(0 4px 8px rgba(0,0,0,0.3));
}

.price-header h3 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 8px;
  font-family: 'Outfit', sans-serif;
}

.price-desc {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.price-details {
  margin-bottom: 32px;
  display: flex;
  flex-direction: column;
}

.price-amount {
  font-size: 2rem;
  font-weight: 800;
  font-family: 'Outfit', sans-serif;
  background: linear-gradient(135deg, #fff, var(--text-muted));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.highlight-card .price-amount {
  background: linear-gradient(135deg, #fff, var(--pink-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.price-period {
  font-size: 0.8rem;
  color: var(--text-dark);
  font-weight: 600;
  margin-top: 4px;
}

.price-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 40px;
  flex-grow: 1;
}

.price-features li {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.price-features li span {
  color: var(--accent-color);
  font-weight: bold;
}

.highlight-card .price-features li span {
  color: var(--primary-color);
}

/* 11. Guarantee Section 核心保障 & 数据背书 */
.guarantee-section {
  padding: 100px 0;
  background: rgba(2, 4, 8, 0.4);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.guarantee-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-bottom: 80px;
}

.guarantee-card {
  background: rgba(10, 17, 32, 0.4);
  border: 1px solid var(--border-color);
  border-radius: 24px;
  padding: 32px 28px;
  text-align: center;
  transition: var(--transition-smooth);
}

.guarantee-card:hover {
  background: var(--card-bg-hover);
  border-color: rgba(255, 255, 255, 0.12);
  transform: translateY(-3px);
}

.guarantee-icon {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  background: rgba(139, 92, 246, 0.08);
  color: var(--primary-color);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  transition: var(--transition-smooth);
}

.guarantee-card:hover .guarantee-icon {
  background: var(--primary-color);
  color: #fff;
  transform: rotate(5deg) scale(1.05);
  box-shadow: 0 0 15px var(--primary-glow);
}

.guarantee-icon svg {
  width: 26px;
  height: 26px;
}

.guarantee-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 12px;
}

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

/* 数据展示栏 */
.stats-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: linear-gradient(135deg, rgba(10, 17, 32, 0.6) 0%, rgba(5, 8, 14, 0.8) 100%);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 28px;
  padding: 40px;
  backdrop-filter: blur(15px);
  box-shadow: 0 10px 40px rgba(0,0,0,0.3);
}

.stat-item {
  flex: 1;
  text-align: center;
}

.stat-num {
  font-size: 3rem;
  font-weight: 800;
  font-family: 'Outfit', sans-serif;
  background: linear-gradient(135deg, #fff, var(--accent-color), var(--primary-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1;
  margin-bottom: 8px;
}

.stat-label {
  font-size: 0.875rem;
  color: var(--text-muted);
  font-weight: 500;
}

.stat-divider {
  width: 1px;
  height: 48px;
  background: rgba(255, 255, 255, 0.08);
}

/* 12. FAQ Section 常见问题折叠面板 */
.faq-section {
  padding: 100px 0;
}

.faq-accordion {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  overflow: hidden;
  transition: var(--transition-smooth);
}

.faq-item:hover {
  border-color: rgba(255, 255, 255, 0.12);
}

.faq-item.active {
  border-color: rgba(139, 92, 246, 0.25);
  background: rgba(16, 26, 48, 0.5);
  box-shadow: 0 10px 30px rgba(139, 92, 246, 0.03);
}

.faq-question {
  width: 100%;
  padding: 24px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  text-align: left;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-color);
}

.faq-icon {
  font-size: 1.4rem;
  color: var(--text-muted);
  line-height: 1;
  transition: var(--transition-smooth);
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.faq-item.active .faq-icon {
  transform: rotate(45deg);
  color: var(--primary-color);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.faq-answer p {
  padding: 0 28px 24px 28px;
  font-size: 0.925rem;
  color: var(--text-muted);
  line-height: 1.6;
  border-top: 1px solid rgba(255,255,255,0.02);
  padding-top: 16px;
}

/* 13. CTA 行动召唤区域 */
.cta-section {
  padding: 80px 0 120px 0;
  position: relative;
}

.cta-container {
  max-width: 1000px;
  margin: 0 auto;
  background: radial-gradient(circle at 50% 0%, rgba(139, 92, 246, 0.15) 0%, rgba(10, 17, 32, 0.8) 100%);
  border: 1px solid rgba(139, 92, 246, 0.2);
  border-radius: 32px;
  padding: 72px 24px;
  text-align: center;
  position: relative;
  overflow: hidden;
  box-shadow: 0 20px 50px rgba(139, 92, 246, 0.1);
  backdrop-filter: blur(15px);
}

.cta-glow {
  position: absolute;
  top: -50px; left: 50%;
  transform: translateX(-50%);
  width: 300px;
  height: 100px;
  background: var(--primary-color);
  filter: blur(60px);
  opacity: 0.3;
  pointer-events: none;
}

.cta-title {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 12px;
  font-family: 'Outfit', sans-serif;
  letter-spacing: -0.5px;
}

.cta-desc {
  font-size: 1.15rem;
  color: var(--text-muted);
  margin-bottom: 40px;
}

.cta-sub {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 32px;
  margin-top: 36px;
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* 14. Footer 页脚样式 */
.footer {
  background: var(--bg-darker);
  border-top: 1px solid var(--border-color);
  padding: 60px 0;
  font-size: 0.875rem;
  color: var(--text-dark);
}

.footer-container {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 48px;
  align-items: start;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.footer-moto {
  color: var(--text-muted);
  max-width: 320px;
  line-height: 1.6;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-links a {
  color: var(--text-muted);
  transition: var(--transition-fast);
}

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

.footer-copyright {
  text-align: right;
  line-height: 1.6;
}

/* ==========================================================================
   15. 响应式布局自适应 (Responsive Design)
   ========================================================================== */

@media (max-width: 1024px) {
  .hero-title {
    font-size: 3.25rem;
  }
  .hero-cards-grid {
    gap: 20px;
  }
  .card-content {
    padding: 32px 24px;
  }
  .contrast-wrapper {
    flex-direction: column;
    gap: 16px;
  }
  .contrast-arrow {
    transform: rotate(90deg);
    margin: 12px 0;
  }
  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 500px;
    margin: 0 auto;
    gap: 24px;
  }
  .guarantee-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .stats-bar {
    flex-wrap: wrap;
    gap: 32px;
    padding: 32px;
  }
  .stat-item {
    flex: 1 1 calc(50% - 16px);
  }
  .stat-divider {
    display: none;
  }
}

@media (max-width: 768px) {
  /* 导航响应式 */
  .mobile-nav-toggle {
    display: flex;
  }
  
  .nav-menu {
    position: fixed;
    top: 80px;
    left: 0;
    right: 0;
    background: rgba(5, 8, 14, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    flex-direction: column;
    padding: 40px 24px;
    gap: 24px;
    transform: translateY(-150%);
    opacity: 0;
    transition: var(--transition-smooth);
    z-index: 99;
  }
  
  .nav-menu.active {
    transform: translateY(0);
    opacity: 1;
  }
  
  .header-actions {
    display: none; /* 移动端在菜单里折叠或隐藏 */
  }
  
  /* Hero 响应式 */
  .hero-section {
    padding-top: 130px;
    padding-bottom: 56px;
  }
  .hero-title {
    font-size: 2.5rem;
  }
  .hero-desc {
    font-size: 1rem;
    margin-bottom: 40px;
  }
  .hero-cards-grid {
    grid-template-columns: 1fr;
    max-width: 380px;
    margin: 0 auto;
    gap: 24px;
  }
  
  /* 对比与卡片 */
  .contrast-box {
    padding: 24px;
  }
  .contrast-list {
    gap: 20px;
  }
  
  /* 保障与指标 */
  .guarantee-grid {
    grid-template-columns: 1fr;
  }
  
  .stat-num {
    font-size: 2.25rem;
  }
  
  /* 页脚 */
  .footer-container {
    grid-template-columns: 1fr;
    gap: 32px;
    text-align: center;
  }
  .footer-brand {
    align-items: center;
  }
  .footer-copyright {
    text-align: center;
  }
}

/* 动效辅助类 */
.animate-fade-in {
  opacity: 0;
  transform: translateY(20px);
  animation: fade-in-up 0.8s cubic-bezier(0.25, 0.8, 0.25, 1) forwards;
}

@keyframes fade-in-up {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.animate-scroll-fade {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.animate-scroll-fade.visible {
  opacity: 1;
  transform: translateY(0);
}