/* ==========================================================================
   【风格 02 · 巨猫云岛】肥猫云 (FATCAT CLOUD) 全站共享样式表
   配色：淡晴空蓝 #DDF0FC 底，深海蓝文字 #1F5C8B，主色云青 #2E8FD0
   字体：标题超粗黑体 (Noto Sans SC 900, 苹方/雅黑)
   卡片：白色大圆角软投影，点缀漂浮小岛、飞鸟与暖阳
   ========================================================================== */

:root {
  --bg-sky: #DDF0FC;
  --bg-sky-light: #EEF8FF;
  --text-ocean: #1F5C8B;
  --text-deep: #103B5B;
  --text-muted: #28638C;
  --text-dim: #38739B;
  
  --primary-cyan: #2E8FD0;
  --primary-hover: #1E79B5;
  --primary-gradient: linear-gradient(135deg, #48A7E8 0%, #2E8FD0 50%, #1A75B2 100%);
  
  --accent-warm: #FFA500;
  --accent-warm-light: #FFE8B8;
  --accent-sun: #FFB830;
  --accent-green: #20BF7A;
  --accent-pink: #FFA2B8;

  --card-bg: #FFFFFF;
  --card-radius: 26px;
  --card-shadow: 0 16px 36px rgba(31, 92, 139, 0.08), 0 4px 12px rgba(31, 92, 139, 0.03);
  --card-shadow-hover: 0 22px 46px rgba(46, 143, 208, 0.16), 0 6px 16px rgba(31, 92, 139, 0.06);
  --card-border: 1px solid rgba(255, 255, 255, 0.95);
  
  --container-width: 1200px;
  --font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

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

html {
  font-family: var(--font-family);
  background-color: var(--bg-sky);
  color: var(--text-ocean);
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  min-height: 100vh;
  line-height: 1.65;
  overflow-x: hidden;
  background: linear-gradient(180deg, #DDF0FC 0%, #E9F6FD 45%, #DDF0FC 100%);
}

.container {
  width: 100%;
  max-width: var(--container-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

/* 锚点防遮挡 */
[id] {
  scroll-margin-top: 86px;
}

/* 容器长文本安全折行 */
body, .container, .content-box, .kb-card, .pricing-card, .feature-card, .article-box {
  overflow-wrap: break-word;
  word-break: break-word;
}

/* 无障碍：跳转到主要内容 (Skip Link) */
.skip-link {
  position: absolute;
  top: -120px;
  left: 20px;
  background: var(--primary-cyan);
  color: #FFFFFF;
  padding: 12px 20px;
  font-weight: 800;
  font-size: 0.95rem;
  border-radius: 8px;
  z-index: 99999;
  text-decoration: none;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.25);
  transition: top 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.skip-link:focus {
  top: 15px;
  outline: 3px solid var(--accent-warm);
  outline-offset: 3px;
}

/* 键盘导航焦点状态 */
:focus-visible {
  outline: 3px solid var(--primary-cyan);
  outline-offset: 3px;
}

button:focus-visible, a:focus-visible, summary:focus-visible, input:focus-visible {
  outline: 3px solid var(--primary-cyan);
  outline-offset: 2px;
}

a {
  color: inherit;
  text-decoration: none;
  transition: all 0.25s ease;
}

.text-gradient {
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.section {
  padding: 85px 0;
  position: relative;
}

.section-header {
  text-align: center;
  margin-bottom: 50px;
}

.section-tag {
  display: inline-block;
  padding: 6px 16px;
  font-size: 0.85rem;
  font-weight: 800;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  color: var(--primary-cyan);
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid rgba(46, 143, 208, 0.25);
  border-radius: 9999px;
  margin-bottom: 14px;
  box-shadow: 0 4px 12px rgba(31, 92, 139, 0.05);
}

.section-title {
  font-size: 2.35rem;
  font-weight: 900;
  line-height: 1.25;
  margin-bottom: 14px;
  color: var(--text-deep);
  letter-spacing: -0.5px;
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 650px;
  margin: 0 auto;
}

/* 按钮规范 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 800;
  font-size: 1rem;
  padding: 13px 28px;
  border-radius: 9999px;
  cursor: pointer;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  white-space: nowrap;
  border: none;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
}

.btn-primary {
  background: var(--primary-gradient);
  color: #FFFFFF;
  box-shadow: 0 8px 24px rgba(46, 143, 208, 0.32);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 30px rgba(46, 143, 208, 0.45);
  filter: brightness(1.05);
}

.btn-secondary {
  background: #FFFFFF;
  color: var(--text-ocean);
  border: 1.5px solid rgba(46, 143, 208, 0.22);
  box-shadow: 0 4px 16px rgba(31, 92, 139, 0.06);
}

.btn-secondary:hover {
  background: #F4F9FD;
  border-color: var(--primary-cyan);
  transform: translateY(-2px);
  box-shadow: 0 8px 22px rgba(31, 92, 139, 0.1);
}

.btn-sm {
  padding: 9px 20px;
  font-size: 0.92rem;
}

.btn-lg {
  padding: 15px 36px;
  font-size: 1.1rem;
}

.btn-full {
  width: 100%;
}

/* 顶部导航栏 (页眉) */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(221, 240, 252, 0.88);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.6);
  box-shadow: 0 4px 20px rgba(31, 92, 139, 0.04);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 74px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.35rem;
  font-weight: 900;
  color: var(--text-deep);
  letter-spacing: -0.5px;
}

.brand-logo svg {
  width: 34px;
  height: 34px;
  color: var(--primary-cyan);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 26px;
  list-style: none;
}

.nav-link {
  color: var(--text-ocean);
  font-weight: 700;
  font-size: 0.96rem;
}

.nav-link:hover {
  color: var(--primary-cyan);
}

/* 子页面内容框架 */
.subpage-header {
  padding: 60px 0 35px;
  text-align: center;
  border-bottom: 1px solid rgba(46, 143, 208, 0.15);
}

.content-box {
  background: var(--card-bg);
  border: var(--card-border);
  border-radius: var(--card-radius);
  padding: 48px;
  margin: 45px auto;
  max-width: 920px;
  box-shadow: var(--card-shadow);
}

.content-box h2 {
  font-size: 1.6rem;
  font-weight: 900;
  color: var(--text-deep);
  margin: 34px 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid #EDF4F9;
}

.content-box h2:first-of-type {
  margin-top: 0;
}

.content-box p {
  color: var(--text-ocean);
  font-size: 1.02rem;
  line-height: 1.8;
  margin-bottom: 16px;
}

.content-box ul {
  color: var(--text-ocean);
  margin-bottom: 22px;
  padding-left: 24px;
  line-height: 1.85;
}

.content-box li {
  margin-bottom: 9px;
}

.content-alert {
  background: #FEF8E7;
  border-left: 4px solid var(--accent-warm);
  padding: 18px 22px;
  border-radius: 8px;
  margin: 26px 0;
  color: #7A4B00;
  box-shadow: 0 4px 14px rgba(255, 165, 0, 0.08);
}

/* 底部页脚 */
.site-footer {
  background: rgba(255, 255, 255, 0.85);
  border-top: 1px solid rgba(46, 143, 208, 0.15);
  padding: 48px 0 36px;
  margin-top: 60px;
  backdrop-filter: blur(12px);
}

.footer-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 44px;
  flex-wrap: wrap;
  margin-bottom: 24px;
}

.footer-link {
  font-size: 1.02rem;
  font-weight: 800;
  color: var(--text-deep);
  position: relative;
  padding: 6px 4px;
}

.footer-link:hover {
  color: var(--primary-cyan);
}

.footer-copy {
  text-align: center;
  font-size: 0.88rem;
  color: var(--text-muted);
  font-weight: 600;
}

/* 移动端媒体查询 */
@media (max-width: 768px) {
  .section {
    padding: 55px 0;
  }

  .nav-container {
    height: auto;
    padding-top: 12px;
    padding-bottom: 10px;
    flex-wrap: wrap;
    gap: 10px;
  }

  .nav-menu {
    display: flex;
    width: 100%;
    overflow-x: auto;
    white-space: nowrap;
    padding: 6px 2px 6px;
    gap: 18px;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    order: 3;
    border-top: 1px solid rgba(46, 143, 208, 0.1);
  }

  .nav-menu::-webkit-scrollbar {
    display: none;
  }

  .content-box {
    padding: 28px 20px;
    margin: 25px auto;
  }

  .footer-nav {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    text-align: center;
    gap: 16px 12px;
  }

  .footer-link {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
    padding: 10px 14px;
    background: #F1F8FD;
    border-radius: 12px;
  }

  /* 移动端触控尺寸达标 (≥44×44 CSS 像素) */
  .btn, .btn-sm, .btn-primary, .btn-secondary {
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .modal-close-btn {
    min-width: 44px;
    min-height: 44px;
  }
}

/* 动效减弱偏好适配 (prefers-reduced-motion) */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  #sky-canvas {
    display: none !important;
  }
}