/* ========================================
   批量创作网页 - 样式文件
   转换自 Tailwind CSS 到标准 CSS3
   ======================================== */

/* === 1. CSS 变量定义 === */
:root {
  /* 背景色 */
  --bg-primary: #0A101F;
  --bg-secondary: #080c17;
  --bg-card: rgba(30, 41, 59, 0.3);
  --bg-card-hover: rgba(30, 41, 59, 0.6);
  --bg-slate-800: rgba(30, 41, 59, 0.5);
  --bg-slate-900: #0F172A;
  
  /* 文字色 */
  --text-primary: #ffffff;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-slate-300: #cbd5e1;
  --text-slate-400: #94a3b8;
  --text-slate-500: #64748b;
  --text-slate-600: #475569;
  
  /* 品牌色 */
  --brand-blue: #3b82f6;
  --brand-blue-dark: #2563eb;
  --brand-cyan: #06b6d4;
  --brand-cyan-dark: #0891b2;
  --brand-indigo: #6366f1;
  --brand-pink: #ec4899;
  --brand-rose: #f43f5e;
  --brand-orange: #f97316;
  --brand-green: #10b981;
  
  /* 边框色 */
  --border-light: rgba(255, 255, 255, 0.05);
  --border-medium: rgba(255, 255, 255, 0.1);
  --border-slate-700: rgba(51, 65, 85, 0.5);
  --border-slate-800: rgba(30, 41, 59, 1);
  --border-slate-900: rgba(15, 23, 42, 1);
  
  /* 间距 */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  
  /* 圆角 */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;
  
  /* 阴影 */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
}

/* === 2. 重置和基础样式 === */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
    'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.5;
  overflow-x: hidden;
}

::selection {
  background-color: var(--brand-blue);
  color: var(--text-primary);
}

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

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

ul {
  list-style: none;
}

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

/* === 3. 布局组件 === */
.page-container {
  min-height: 100vh;
}

.container {
  max-width: 1280px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

/* === 4. 导航栏 === */
.main-nav {
  position: fixed;
  width: 100%;
  z-index: 50;
  transition: all 0.3s ease;
  background-color: transparent;
  padding-top: 1.5rem;
  padding-bottom: 1.5rem;
}

.main-nav.nav-scrolled {
  background-color: rgba(10, 16, 31, 0.9);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-medium);
  padding-top: 1rem;
  padding-bottom: 1rem;
}

.nav-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-logo {
  font-size: 1.5rem;
  font-weight: 700;
  background: linear-gradient(to right, #60a5fa, #67e8f9);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.nav-links {
  display: none;
  gap: 2rem;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.nav-links a {
  transition: color 0.2s ease;
}

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

@media (min-width: 768px) {
  .nav-links {
    display: flex;
  }
}

.nav-button {
  background: var(--brand-blue);
  color: var(--text-primary);
  padding: 0.5rem 1.5rem;
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 500;
  transition: all 0.3s ease;
  box-shadow: 0 0 15px rgba(37, 99, 235, 0.5);
}

.nav-button:hover {
  background: var(--brand-blue-dark);
}

/* === 5. Hero 区域 === */
.hero {
  position: relative;
  padding-top: 8rem;
  padding-bottom: 5rem;
  overflow: hidden;
}

@media (min-width: 1024px) {
  .hero {
    padding-top: 12rem;
    padding-bottom: 8rem;
  }
}

.hero-bg-blur-1 {
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 1000px;
  height: 600px;
  background-color: rgba(37, 99, 235, 0.2);
  border-radius: 50%;
  filter: blur(120px);
  pointer-events: none;
}

.hero-bg-blur-2 {
  position: absolute;
  bottom: 0;
  right: 0;
  width: 800px;
  height: 600px;
  background-color: rgba(147, 51, 234, 0.1);
  border-radius: 50%;
  filter: blur(100px);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 10;
  text-align: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
  border: 1px solid rgba(59, 130, 246, 0.3);
  background-color: rgba(59, 130, 246, 0.1);
  color: #93c5fd;
  font-size: 0.75rem;
  margin-bottom: 2rem;
}

.badge-dot {
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background-color: #60a5fa;
  margin-right: 0.5rem;
  animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

.hero-title {
  font-size: 3rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  line-height: 1.2;
  letter-spacing: -0.025em;
}

@media (min-width: 768px) {
  .hero-title {
    font-size: 4.5rem;
  }
}

.hero-title .gradient-text {
  background: linear-gradient(to right, #60a5fa, #67e8f9);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-description {
  font-size: 1.125rem;
  color: var(--text-secondary);
  max-width: 42rem;
  margin: 0 auto 2.5rem;
  line-height: 1.75;
}

@media (min-width: 768px) {
  .hero-description {
    font-size: 1.25rem;
  }
}

.hero-buttons {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 4rem;
}

@media (min-width: 640px) {
  .hero-buttons {
    flex-direction: row;
  }
}

.btn-primary {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem 2rem;
  background-color: var(--text-primary);
  color: #1e3a8a;
  border-radius: var(--radius-lg);
  font-weight: 700;
  font-size: 1.125rem;
  transition: all 0.3s ease;
  box-shadow: 0 0 20px rgba(255, 255, 255, 0.3);
}

.btn-primary:hover {
  background-color: #f1f5f9;
}

.btn-secondary {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem 2rem;
  border: 1px solid var(--text-muted);
  color: var(--text-secondary);
  border-radius: var(--radius-lg);
  font-weight: 500;
  font-size: 1.125rem;
  transition: all 0.3s ease;
}

.btn-secondary:hover {
  border-color: var(--text-secondary);
  color: var(--text-primary);
}

.btn-icon {
  width: 1.25rem;
  height: 1.25rem;
}

.btn-icon-left {
  margin-right: 0.5rem;
}

.btn-icon-right {
  margin-left: 0.5rem;
}

/* === 6. 软件界面展示 === */
.hero-showcase {
  position: relative;
  max-width: 80rem;
  margin: 3rem auto 0;
}

.showcase-border {
  position: absolute;
  inset: -0.25rem;
  background: linear-gradient(to right, #3b82f6, #a855f7, #06b6d4);
  border-radius: var(--radius-xl);
  opacity: 0.3;
  filter: blur(8px);
  transition: opacity 1s ease;
}

.hero-showcase:hover .showcase-border {
  opacity: 0.5;
}

.showcase-inner {
  position: relative;
  border-radius: var(--radius-xl);
  background-color: var(--bg-slate-900);
  border: 1px solid rgba(51, 65, 85, 0.5);
  overflow: hidden;
  box-shadow: var(--shadow-2xl);
}

.showcase-header {
  width: 100%;
  height: 3rem;
  background-color: var(--bg-primary);
  border-bottom: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  padding: 0 1rem;
  gap: 0.5rem;
}

.showcase-dot {
  width: 0.75rem;
  height: 0.75rem;
  border-radius: 50%;
}

.showcase-dot-red {
  background-color: #ef4444;
}

.showcase-dot-yellow {
  background-color: #eab308;
}

.showcase-dot-green {
  background-color: #22c55e;
}

.showcase-placeholder {
  aspect-ratio: 16 / 9;  /* 标准宽屏比例 16:9 */
  width: 100%;
  background-color: #1e293b;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.showcase-image {
  width: 100%;
  height: 100%;
  object-fit: cover;  /* 改为cover，填满整个容器 */
  display: block;
  object-position: center;  /* 居中显示，裁剪边缘 */
}

.showcase-content {
  background-color: #0f172a;
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 2.5rem;
}

.showcase-icon {
  width: 4rem;
  height: 4rem;
  color: var(--brand-blue);
  opacity: 0.5;
  margin-bottom: 1rem;
}

.showcase-title {
  font-size: 1.25rem;
  color: var(--text-primary);
  font-weight: 600;
}

.showcase-subtitle {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-top: 0.5rem;
}

/* === 7. 功能区域 === */
.features-section {
  padding: 6rem 0;
  position: relative;
}

.section-header {
  text-align: center;
  margin-bottom: 4rem;
}

.section-title {
  font-size: 1.875rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

@media (min-width: 768px) {
  .section-title {
    font-size: 3rem;
  }
}

.section-subtitle {
  color: var(--text-secondary);
  font-size: 1.125rem;
}

.feature-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

@media (min-width: 768px) {
  .feature-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .feature-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.feature-card {
  padding: 1.5rem;
  border-radius: 1rem;
  background-color: var(--bg-card);
  border: 1px solid var(--border-light);
  transition: all 0.3s ease;
  display: flex;
  flex-direction: column;
  height: 100%;
}

.feature-card:hover {
  border-color: rgba(59, 130, 246, 0.3);
  background-color: var(--bg-card-hover);
}

.feature-icon-wrapper {
  width: 3rem;
  height: 3rem;
  border-radius: var(--radius-lg);
  background-color: rgba(51, 65, 85, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
  transition: transform 0.3s ease;
  box-shadow: inset 0 2px 4px 0 rgba(0, 0, 0, 0.06);
}

.feature-card:hover .feature-icon-wrapper {
  transform: scale(1.1);
}

.feature-icon {
  width: 1.5rem;
  height: 1.5rem;
}

.feature-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
  transition: color 0.3s ease;
}

.feature-card:hover .feature-title {
  color: #93c5fd;
}

.feature-desc {
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin-bottom: 1rem;
  line-height: 1.75;
  min-height: 2.5rem;
}

.feature-details {
  margin-top: auto;
  padding-top: 1rem;
  border-top: 1px solid var(--border-light);
}

.feature-details ul {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.feature-details li {
  display: flex;
  align-items: flex-start;
  font-size: 0.75rem;
  color: var(--text-slate-300);
}

.feature-details li span {
  margin-right: 0.5rem;
  color: var(--brand-blue);
  margin-top: 0.125rem;
}

.feature-placeholder {
  padding: 1.5rem;
  border-radius: 1rem;
  background-color: rgba(30, 41, 59, 0.2);
  border: 1px dashed var(--border-light);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  /* 让占位卡片单独占一行并居中 */
  grid-column: 1 / -1;
  max-width: 400px;
  margin: 0 auto;
}

.feature-placeholder span {
  font-size: 0.875rem;
}

/* === 8. AI引擎区域 === */
.engine-section {
  padding: 6rem 0;
  background-color: var(--bg-secondary);
}

.engine-header {
  text-align: center;
  margin-bottom: 6rem;
}

.engine-badge {
  display: inline-block;
  padding: 0.25rem 1rem;
  border-radius: var(--radius-full);
  background-color: rgba(59, 130, 246, 0.1);
  border: 1px solid rgba(59, 130, 246, 0.2);
  color: #93c5fd;
  font-size: 0.875rem;
  margin-bottom: 1.5rem;
  font-weight: 500;
}

.engine-title {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

@media (min-width: 768px) {
  .engine-title {
    font-size: 3.75rem;
  }
}

.engine-subtitle {
  color: var(--text-secondary);
  font-size: 1.25rem;
}

.engine-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4rem;
  margin-bottom: 10rem;
  position: relative;
}

@media (min-width: 1024px) {
  .engine-item {
    flex-direction: row;
  }
  
  .engine-item.reverse {
    flex-direction: row-reverse;
  }
}

.engine-item:last-child {
  margin-bottom: 5rem;
}

.engine-connector {
  display: none;
  position: absolute;
  left: 50%;
  bottom: -100px;
  width: 1px;
  height: 100px;
  background: linear-gradient(to bottom, rgba(99, 102, 241, 0.5), transparent);
}

@media (min-width: 1024px) {
  .engine-connector {
    display: block;
  }
}

.engine-content {
  flex: 1;
}

.engine-icon-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.engine-icon-box {
  width: 3rem;
  height: 3rem;
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-primary);
  box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

.engine-icon-box.indigo {
  background-color: var(--brand-indigo);
  box-shadow: 0 10px 15px -3px rgba(99, 102, 241, 0.3);
}

.engine-icon-box.pink {
  background-color: var(--brand-pink);
  box-shadow: 0 10px 15px -3px rgba(236, 72, 153, 0.3);
}

.engine-icon-box.gradient {
  background: linear-gradient(to bottom right, var(--brand-rose), var(--brand-orange));
  box-shadow: 0 10px 15px -3px rgba(244, 63, 94, 0.3);
}

.engine-icon-box svg {
  width: 1.5rem;
  height: 1.5rem;
}

.engine-number {
  font-size: 1.875rem;
  font-weight: 700;
  color: var(--text-primary);
}

.engine-heading {
  font-size: 1.5rem;
  color: var(--text-slate-300);
  margin-bottom: 1rem;
  font-weight: 500;
}

.engine-description {
  color: var(--text-secondary);
  font-size: 1.125rem;
  margin-bottom: 2rem;
  line-height: 1.75;
}

.engine-description strong {
  color: var(--text-primary);
  font-weight: 600;
}

.engine-features {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

@media (min-width: 640px) {
  .engine-features {
    grid-template-columns: repeat(2, 1fr);
  }
}

.engine-feature-box {
  padding: 1.25rem;
  background: linear-gradient(to bottom right, var(--bg-slate-800), var(--bg-slate-900));
  border-radius: var(--radius-xl);
  border: 1px solid var(--border-medium);
  transition: border-color 0.3s ease;
}

.engine-feature-box:hover {
  border-color: rgba(99, 102, 241, 0.5);
}

.engine-feature-box.pink:hover {
  border-color: rgba(236, 72, 153, 0.5);
}

.engine-feature-box.orange:hover {
  border-color: rgba(249, 115, 22, 0.5);
}

.engine-feature-icon {
  width: 2.5rem;
  height: 2.5rem;
  background-color: rgba(99, 102, 241, 0.2);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 0.75rem;
}

.engine-feature-icon.rose {
  background-color: rgba(244, 63, 94, 0.2);
}

.engine-feature-icon.orange {
  background-color: rgba(249, 115, 22, 0.2);
}

.engine-feature-icon svg {
  width: 1.5rem;
  height: 1.5rem;
  color: #a78bfa;
}

.engine-feature-icon.rose svg {
  color: #fb7185;
}

.engine-feature-icon.orange svg {
  color: #fb923c;
}

.engine-feature-title {
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

.engine-feature-desc {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.engine-check-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.engine-check-item {
  display: flex;
  align-items: center;
  padding: 0.75rem;
  background-color: rgba(236, 72, 153, 0.05);
  border-radius: var(--radius-md);
  border: 1px solid rgba(236, 72, 153, 0.1);
}

.engine-check-icon {
  width: 1.25rem;
  height: 1.25rem;
  color: var(--brand-pink);
  margin-right: 0.75rem;
  flex-shrink: 0;
}

.engine-check-text {
  color: var(--text-slate-300);
  font-size: 0.875rem;
}

.engine-visual {
  flex: 1;
  position: relative;
  display: flex;
  flex-direction: column;
}

.engine-visual-glow {
  position: absolute;
  inset: -1rem;
  background-color: rgba(99, 102, 241, 0.2);
  border-radius: 1rem;
  filter: blur(40px);
  opacity: 0;
  transition: opacity 0.5s ease;
}

.engine-visual:hover .engine-visual-glow {
  opacity: 1;
}

.engine-visual-glow.pink {
  background-color: rgba(236, 72, 153, 0.2);
}

.engine-visual-glow.rose {
  background-color: rgba(244, 63, 94, 0.2);
}

.engine-visual-inner {
  position: relative;
  background-color: var(--bg-slate-900);
  border-radius: var(--radius-xl);
  overflow: hidden;
  border: 1px solid var(--border-slate-700);
  box-shadow: var(--shadow-2xl);
  display: flex;
  flex-direction: column;
  flex: 1;  /* 填充整个父容器高度 */
  min-height: 400px;  /* 设置最小高度，避免过矮 */
}

.engine-visual-header {
  height: 2rem;
  background-color: var(--bg-slate-900);
  border-bottom: 1px solid var(--border-slate-700);
  display: flex;
  align-items: center;
  padding: 0 1rem;
  gap: 0.5rem;
}

.engine-visual-dot {
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background-color: var(--text-slate-600);
}

.engine-visual-content {
  padding: 0;  /* 移除padding，让图片完全填充 */
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  position: relative;
}

/* 如果使用实际图片，添加此样式 */
.engine-visual-content img {
  width: 100%;
  height: 100%;
  object-fit: cover;  /* 填满容器 */
  object-position: center;
  position: absolute;
  top: 0;
  left: 0;
}

/* 占位符内容样式（当没有图片时显示） */
.engine-visual-content > svg,
.engine-visual-content > p {
  position: relative;
  z-index: 1;
  padding: 1.5rem;
}

.engine-visual-content.gradient {
  background: linear-gradient(to bottom right, var(--bg-slate-900), #000000);
}

.engine-visual-icon {
  width: 4rem;
  height: 4rem;
  color: var(--brand-indigo);
  opacity: 0.5;
  margin-bottom: 1rem;
}

.engine-visual-icon.pink {
  color: var(--brand-pink);
}

.engine-visual-icon.rose {
  color: var(--brand-rose);
}

.engine-visual-title {
  color: var(--text-primary);
  font-weight: 500;
}

.engine-visual-subtitle {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-top: 0.5rem;
}

.engine-core-badge {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  background: linear-gradient(to right, var(--brand-rose), var(--brand-orange));
  color: var(--text-primary);
  font-size: 0.75rem;
  font-weight: 700;
  border-radius: var(--radius-sm);
  margin-bottom: 1rem;
}

/* === 9. CTA 区域 === */
.cta-section {
  padding: 5rem 0;
  position: relative;
  overflow: hidden;
  border-top: 1px solid var(--border-light);
}

.cta-bg {
  position: absolute;
  inset: 0;
  background-color: rgba(37, 99, 235, 0.1);
}

.cta-content {
  position: relative;
  z-index: 10;
  text-align: center;
}

.cta-title {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  color: var(--text-primary);
}

@media (min-width: 768px) {
  .cta-title {
    font-size: 3rem;
  }
}

.cta-description {
  color: var(--text-slate-300);
  font-size: 1.125rem;
  margin-bottom: 2.5rem;
  max-width: 42rem;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.75;
}

.cta-buttons {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 1rem;
}

@media (min-width: 640px) {
  .cta-buttons {
    flex-direction: row;
  }
}

.btn-gradient {
  padding: 1rem 2.5rem;
  background: linear-gradient(to right, var(--brand-blue), var(--brand-cyan));
  color: var(--text-primary);
  border-radius: var(--radius-lg);
  font-weight: 700;
  font-size: 1.125rem;
  box-shadow: 0 10px 15px -3px rgba(37, 99, 235, 0.25);
  transition: all 0.3s ease;
}

.btn-gradient:hover {
  background: linear-gradient(to right, var(--brand-blue-dark), var(--brand-cyan-dark));
}

.btn-outline {
  padding: 1rem 2.5rem;
  background-color: var(--bg-primary);
  border: 1px solid var(--text-slate-600);
  color: var(--text-primary);
  border-radius: var(--radius-lg);
  font-weight: 500;
  font-size: 1.125rem;
  transition: all 0.3s ease;
}

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

/* === 10. 页脚 === */
.footer {
  background-color: #050810;
  border-top: 1px solid var(--border-slate-800);
  padding-top: 4rem;
  padding-bottom: 2rem;
}

.footer-content {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-items: center;
}

@media (min-width: 768px) {
  .footer-content {
    flex-direction: row;
  }
}

.footer-brand {
  margin-bottom: 2rem;
}

@media (min-width: 768px) {
  .footer-brand {
    margin-bottom: 0;
  }
}

.footer-logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.footer-tagline {
  color: var(--text-muted);
  font-size: 0.875rem;
}

.footer-links {
  display: flex;
  gap: 2rem;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.footer-links a {
  transition: color 0.2s ease;
}

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

.footer-bottom {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-slate-900);
  text-align: center;
  color: var(--text-slate-600);
  font-size: 0.75rem;
}

/* === 11. 动画 === */
@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* === 12. 工具类 === */
.text-center {
  text-align: center;
}

.text-gradient {
  background: linear-gradient(to right, #60a5fa, #67e8f9);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

@media (min-width: 768px) {
  .md\:text-5xl {
    font-size: 3rem;
  }
}

/* === 13. 滚动行为 === */
html {
  scroll-behavior: smooth;
}

/* === 14. 可访问性 === */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* === 15. 打印样式 === */
@media print {
  .main-nav,
  .cta-section,
  .footer {
    display: none;
  }
}