/* ═══════════════════════════════════════════
   DEEPTRUST 对外官网站群 - 基础样式/设计Token
   版本: V1.0
   日期: 2026-06-25
   引用方式: <link rel="stylesheet" href="../shared/css/base.css">
   ═══════════════════════════════════════════ */

/* ── 设计 Token ── */
:root {
  /* 品牌色 */
  --color-brand: #1890ff;
  --color-brand-hover: #40a9ff;
  --color-brand-active: #096dd9;
  --color-brand-light: #e6f7ff;
  --color-dark: #1a2b4a;
  --color-dark-light: #2c3e6b;
  --color-dark-muted: #4a5a7a;

  /* 中性色 */
  --color-white: #ffffff;
  --color-bg: #f8f9fc;
  --color-bg-light: #ffffff;
  --color-border: #e8ecf1;
  --color-text: #333333;
  --color-text-secondary: #666666;
  --color-text-muted: #999999;

  /* 状态色 */
  --color-success: #52c41a;
  --color-warning: #faad14;
  --color-error: #ff4d4f;
  --color-info: var(--color-brand);

  /* 渐变色 */
  --gradient-hero: linear-gradient(135deg, var(--color-dark) 0%, #0f1d3a 100%);
  --gradient-brand: linear-gradient(135deg, var(--color-brand) 0%, var(--color-brand-active) 100%);
  --gradient-cta: linear-gradient(135deg, var(--color-brand) 0%, #096dd9 100%);
  --gradient-card: linear-gradient(180deg, rgba(24, 144, 255, 0.05) 0%, transparent 100%);

  /* 字号 */
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-size-xs: 12px;
  --font-size-sm: 13px;
  --font-size-base: 14px;
  --font-size-md: 16px;
  --font-size-lg: 18px;
  --font-size-xl: 20px;
  --font-size-2xl: 24px;
  --font-size-3xl: 28px;
  --font-size-4xl: 36px;
  --font-size-5xl: 42px;
  --font-size-hero: 48px;

  /* 间距 */
  --section-padding: 80px 0;
  --section-padding-mobile: 50px 0;
  --card-gap: 24px;
  --container-width: 1200px;
  --container-padding: 0 20px;

  /* 圆角 */
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-round: 50%;

  /* 阴影 */
  --shadow-sm: 0 1px 4px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.1);
  --shadow-card: 0 2px 8px rgba(0, 0, 0, 0.06);

  /* 过渡 */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.4s ease;

  /* 头部高度 */
  --header-height: 72px;
}

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

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

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

ul, ol {
  list-style: none;
}

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

input, textarea {
  font-family: inherit;
  font-size: inherit;
}

/* ── 容器 ── */
.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: var(--container-padding);
}

/* ── 通用文字 ── */
.gradient-text {
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: var(--font-size-xs);
  font-weight: 500;
  background: var(--gradient-brand);
  color: var(--color-white);
}

.badge-outline {
  background: transparent;
  border: 1px solid var(--color-brand);
  color: var(--color-brand);
}

/* ── 通用按钮 ── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--radius-lg);
  font-size: var(--font-size-base);
  font-weight: 600;
  transition: all var(--transition-normal);
  white-space: nowrap;
}

.btn-primary {
  background: var(--gradient-brand);
  color: var(--color-white);
  border: 1px solid transparent;
  box-shadow: 0 2px 8px rgba(24, 144, 255, 0.3);
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--color-brand-hover), var(--color-brand));
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(24, 144, 255, 0.4);
}

.btn-outline {
  background: transparent;
  color: var(--color-white);
  border: 1.5px solid rgba(255, 255, 255, 0.5);
}

.btn-outline:hover {
  border-color: var(--color-white);
  background: rgba(255, 255, 255, 0.1);
  transform: translateY(-1px);
}

.btn-dark {
  background: var(--color-dark);
  color: var(--color-white);
  border: 1px solid transparent;
}

.btn-dark:hover {
  background: var(--color-dark-light);
  transform: translateY(-1px);
}

.btn-lg {
  padding: 14px 36px;
  font-size: var(--font-size-md);
}

.btn-sm {
  padding: 8px 18px;
  font-size: var(--font-size-sm);
}

.btn-block {
  width: 100%;
}

/* ── 通用卡片 ── */
.card {
  background: var(--color-white);
  border-radius: var(--radius-xl);
  padding: 32px;
  box-shadow: var(--shadow-card);
  transition: all var(--transition-normal);
}

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

.card-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  margin-bottom: 16px;
  background: var(--gradient-card);
  border: 1px solid rgba(24, 144, 255, 0.1);
}

.card-title {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-dark);
  margin-bottom: 10px;
}

.card-desc {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* ── Hero 区域 ── */
.hero {
  background: var(--gradient-hero);
  color: var(--color-white);
  text-align: center;
  padding: 100px 0 80px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(ellipse at 30% 50%, rgba(24, 144, 255, 0.08) 0%, transparent 60%),
              radial-gradient(ellipse at 70% 20%, rgba(24, 144, 255, 0.05) 0%, transparent 50%);
  pointer-events: none;
}

.hero-badge {
  margin-bottom: 20px;
}

.hero-title {
  font-size: var(--font-size-hero);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 16px;
  letter-spacing: -1px;
}

.hero-subtitle {
  font-size: var(--font-size-lg);
  color: rgba(255, 255, 255, 0.75);
  max-width: 700px;
  margin: 0 auto 32px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 40px;
  margin-top: 48px;
  padding-top: 40px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

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

.hero-stat-number {
  font-size: var(--font-size-4xl);
  font-weight: 800;
  color: var(--color-brand);
  line-height: 1;
}

.hero-stat-label {
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.6);
  margin-top: 6px;
}

/* ── 通用区块 ── */
.section {
  padding: var(--section-padding);
}

.section-alt {
  background: var(--color-bg);
}

.section-white {
  background: var(--color-white);
}

.section-dark {
  background: var(--color-dark);
  color: var(--color-white);
}

.section-header {
  text-align: center;
  margin-bottom: 48px;
}

.section-title {
  font-size: var(--font-size-4xl);
  font-weight: 800;
  color: var(--color-dark);
  margin-bottom: 12px;
  letter-spacing: -0.5px;
}

.section-dark .section-title {
  color: var(--color-white);
}

.section-subtitle {
  font-size: var(--font-size-md);
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.7;
}

.section-dark .section-subtitle {
  color: rgba(255, 255, 255, 0.65);
}

/* ── 网格 ── */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--card-gap);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--card-gap);
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--card-gap);
}

/* ── 步骤流程 ── */
.steps {
  display: flex;
  gap: 32px;
  justify-content: center;
  counter-reset: step;
}

.step-item {
  text-align: center;
  flex: 1;
  max-width: 240px;
}

.step-number {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-round);
  background: var(--gradient-brand);
  color: var(--color-white);
  font-size: var(--font-size-lg);
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
}

.step-title {
  font-size: var(--font-size-md);
  font-weight: 600;
  color: var(--color-dark);
  margin-bottom: 8px;
}

.step-desc {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* ── 底部CTA ── */
.cta-section {
  background: var(--gradient-brand);
  text-align: center;
  padding: 72px 0;
}

.cta-title {
  font-size: var(--font-size-4xl);
  font-weight: 800;
  color: var(--color-white);
  margin-bottom: 12px;
}

.cta-desc {
  font-size: var(--font-size-md);
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: 32px;
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
}

.cta-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ── 标签列表 ── */
.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: var(--font-size-xs);
  background: var(--color-brand-light);
  color: var(--color-brand);
  font-weight: 500;
  border: 1px solid rgba(24, 144, 255, 0.15);
}

/* ── 功能列表（勾号） ── */
.feature-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.feature-list li {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.feature-list li::before {
  content: '✓';
  color: var(--color-success);
  font-weight: 700;
  flex-shrink: 0;
}

/* ── 双端演示区域 ── */
.demo-area {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 24px;
  margin-top: 40px;
}

.demo-pc {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
}

.demo-pc-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  background: #f0f0f0;
  border-bottom: 1px solid var(--color-border);
}

.demo-pc-dot {
  width: 10px;
  height: 10px;
  border-radius: var(--radius-round);
}

.demo-pc-dot.red { background: #ff5f57; }
.demo-pc-dot.yellow { background: #ffbd2e; }
.demo-pc-dot.green { background: #28c840; }

.demo-pc-body {
  padding: 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 300px;
  color: var(--color-text-muted);
}

.demo-mobile {
  background: var(--color-white);
  border-radius: var(--radius-xl);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.12);
  overflow: hidden;
  border: 1px solid var(--color-border);
  position: relative;
}

.demo-mobile-header {
  text-align: center;
  padding: 8px;
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  border-bottom: 1px solid var(--color-border);
}

.demo-mobile-body {
  padding: 24px 16px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 250px;
  color: var(--color-text-muted);
}

/* ── 对比表格 ── */
.comparison {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 32px;
}

.comparison-card {
  padding: 24px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  background: var(--color-white);
}

.comparison-card.before {
  border-left: 4px solid var(--color-error);
}

.comparison-card.after {
  border-left: 4px solid var(--color-success);
}

.comparison-label {
  font-size: var(--font-size-sm);
  font-weight: 600;
  margin-bottom: 8px;
}

.comparison-card.before .comparison-label {
  color: var(--color-error);
}

.comparison-card.after .comparison-label {
  color: var(--color-success);
}

.comparison-value {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* ── 动画 ── */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ── 响应式断点 ── */

/* 平板：768－1199px */
@media (max-width: 1199px) {
  :root {
    --container-width: 100%;
  }

  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }

  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }

  .demo-area {
    grid-template-columns: 1fr;
  }

  .hero-title {
    font-size: var(--font-size-5xl);
  }

  .section-title {
    font-size: var(--font-size-3xl);
  }

  .cta-title {
    font-size: var(--font-size-3xl);
  }

  .steps {
    flex-wrap: wrap;
    gap: 24px;
  }

  .step-item {
    flex: 0 0 calc(50% - 12px);
    max-width: none;
  }
}

/* 移动端：<768px */
@media (max-width: 767px) {
  :root {
    --section-padding: var(--section-padding-mobile);
  }

  .grid-2, .grid-3, .grid-4 {
    grid-template-columns: 1fr;
  }

  .hero {
    padding: 80px 0 50px;
  }

  .hero-title {
    font-size: var(--font-size-3xl);
  }

  .hero-subtitle {
    font-size: var(--font-size-base);
  }

  .hero-stats {
    flex-direction: column;
    gap: 20px;
  }

  .section-title {
    font-size: var(--font-size-2xl);
  }

  .section-subtitle {
    font-size: var(--font-size-sm);
  }

  .cta-title {
    font-size: var(--font-size-2xl);
  }

  .btn-lg {
    padding: 12px 28px;
    font-size: var(--font-size-base);
  }

  .demo-pc-body {
    min-height: 200px;
  }

  .demo-mobile-body {
    min-height: 180px;
  }

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

  .step-item {
    flex: none;
    max-width: 300px;
  }

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