/*
  Chrome 安全下载站 - 全局样式表
  主题：自然生态清新绿
*/

/* ─── CSS 变量 ─── */
:root {
  --bg-primary: #f6fffe;
  --bg-secondary: #f0fdf4;
  --bg-hero: linear-gradient(135deg, #ecfdf5 0%, #f0f9ff 100%);
  --color-primary: #059669;
  --color-accent: #34d399;
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --text-muted: #94a3b8;
  --card-bg: #ffffff;
  --card-radius: 20px;
  --card-shadow: 0 4px 20px rgba(5, 150, 105, 0.06);
  --card-shadow-hover: 0 8px 30px rgba(5, 150, 105, 0.12);
  --border-card: 1px solid #d1fae5;
  --border-card-hover: 1px solid #a7f3d0;
  --btn-gradient: linear-gradient(135deg, #059669, #10b981);
  --btn-radius: 12px;
  --transition-fast: 0.2s ease-out;
  --transition-normal: 0.3s ease-out;
  --transition-slow: 0.5s ease-out;
  --section-spacing: 80px;
  --content-max-width: 1200px;
  --nav-height: 72px;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

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

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

ul, ol {
  list-style: none;
}

/* ─── 布局工具类 ─── */
.container {
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: var(--section-spacing) 0;
}

.section-title {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-primary);
  text-align: center;
  margin-bottom: 16px;
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  text-align: center;
  max-width: 640px;
  margin: 0 auto 48px;
}

/* ─── 动画关键帧 ─── */
@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

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

@keyframes pulseGlow {
  0%, 100% {
    box-shadow: 0 0 0 0 rgba(5, 150, 105, 0.2);
  }
  50% {
    box-shadow: 0 0 20px 4px rgba(5, 150, 105, 0.15);
  }
}

@keyframes leafSway {
  0%, 100% { transform: rotate(-2deg); }
  50% { transform: rotate(2deg); }
}

/* ─── 叶脉底纹 ─── */
.leaf-pattern {
  position: relative;
}
.leaf-pattern::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: 
    radial-gradient(ellipse 80% 50% at 20% 40%, rgba(52, 211, 153, 0.03) 0%, transparent 50%),
    radial-gradient(ellipse 60% 80% at 80% 60%, rgba(5, 150, 105, 0.02) 0%, transparent 50%),
    radial-gradient(ellipse 50% 50% at 50% 50%, rgba(52, 211, 153, 0.015) 0%, transparent 50%);
  pointer-events: none;
  z-index: 0;
}

/* ─── 淡入动效类 ─── */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

.stagger-1 { transition-delay: 0.1s; }
.stagger-2 { transition-delay: 0.2s; }
.stagger-3 { transition-delay: 0.3s; }
.stagger-4 { transition-delay: 0.4s; }
.stagger-5 { transition-delay: 0.5s; }
.stagger-6 { transition-delay: 0.6s; }

/* ─── 滚动条美化 ─── */
::-webkit-scrollbar {
  width: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
  background: var(--color-accent);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--color-primary);
}

/* ─── 打印优化 ─── */
@media print {
  .no-print {
    display: none !important;
  }
}

/* ─── 响应式断点 ─── */
@media (max-width: 768px) {
  :root {
    --section-spacing: 56px;
    --nav-height: 64px;
  }
  .section-title {
    font-size: 1.5rem;
  }
  .section-subtitle {
    font-size: 1rem;
    margin-bottom: 32px;
  }
  .container {
    padding: 0 16px;
  }
}