/* 九州互营官网 - 全局基础样式
 * 风格：大气清新 · 白底科技蓝 · 大留白
 * 参考：飞书官网 / Stripe 官网
 */

:root {
  /* 主色系 - 清爽科技蓝 */
  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-primary-light: #dbeafe;
  --color-accent: #0891b2;

  /* 文字分层 */
  --color-text: #0f172a;
  --color-text-strong: #020617;
  --color-text-secondary: #475569;
  --color-text-muted: #94a3b8;

  /* 边框与背景 */
  --color-border: #e2e8f0;
  --color-border-light: #f1f5f9;
  --color-bg: #ffffff;
  --color-bg-soft: #f8fafc;
  --color-bg-accent: #eff6ff;

  /* 阴影 */
  --shadow-sm: 0 1px 2px 0 rgba(15, 23, 42, 0.04);
  --shadow-md: 0 4px 16px -4px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 12px 32px -8px rgba(15, 23, 42, 0.12);

  /* 圆角 */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;

  /* 布局 */
  --container-max: 1200px;
  --header-height: 72px;
  --transition: 0.2s ease;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial,
    sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

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

img { max-width: 100%; display: block; }
ul { margin: 0; padding: 0; list-style: none; }

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 32px;
}

/* ===== Header - 纯白大气 ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.site-header.scrolled {
  border-bottom-color: var(--color-border-light);
  box-shadow: var(--shadow-sm);
}

.site-header__inner {
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Logo */
.site-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 20px;
  color: var(--color-text-strong);
  letter-spacing: 0.3px;
}
.site-logo img {
  height: 40px;
  width: auto;
}
.site-logo:hover { color: var(--color-text-strong); }

/* 桌面导航 */
.site-nav { display: flex; align-items: center; gap: 2px; }

.site-nav__item { position: relative; }

.site-nav__link {
  display: inline-flex;
  align-items: center;
  height: var(--header-height);
  padding: 0 22px;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text-secondary);
  position: relative;
  transition: color var(--transition);
}
.site-nav__link:hover { color: var(--color-text); }

/* active 态：主色 + 加粗 + 底部粗下划线 */
.site-nav__item.is-active > .site-nav__link {
  color: var(--color-primary);
  font-weight: 600;
}
.site-nav__item.is-active > .site-nav__link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--color-primary);
  border-radius: 3px 3px 0 0;
}

/* 下拉菜单（PC 不 hover 触发） */
.site-nav__dropdown {
  display: none;
}

/* 右侧 CTA */
.site-header__actions {
  display: flex;
  align-items: center;
  gap: 20px;
}

.site-phone {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  color: var(--color-text-secondary);
  white-space: nowrap;
  transition: color var(--transition);
}
.site-phone:hover { color: var(--color-primary); }

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 40px;
  padding: 0 24px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all var(--transition);
  white-space: nowrap;
  letter-spacing: 0.2px;
}

.btn--primary {
  background: var(--color-primary);
  color: #ffffff;
}
.btn--primary:hover {
  background: var(--color-primary-hover);
  color: #ffffff;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn--ghost {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-border);
}
.btn--ghost:hover {
  color: var(--color-primary);
  border-color: var(--color-primary);
  background: var(--color-primary-light);
}

/* 汉堡按钮 */
.site-header__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 36px;
  height: 36px;
  justify-content: center;
  align-items: center;
  cursor: pointer;
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 0;
}
.site-header__toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: all var(--transition);
}

/* ===== 移动端抽屉 ===== */
.mobile-drawer {
  position: fixed;
  inset: 0;
  z-index: 1100;
  background: rgba(15, 23, 42, 0.4);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition), visibility var(--transition);
}
.mobile-drawer.is-open { opacity: 1; visibility: visible; }

.mobile-drawer__panel {
  position: absolute;
  top: 0;
  right: 0;
  width: 86%;
  max-width: 360px;
  height: 100%;
  background: #ffffff;
  transform: translateX(100%);
  transition: transform var(--transition);
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
}
.mobile-drawer.is-open .mobile-drawer__panel { transform: translateX(0); }

.mobile-drawer__close {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 36px;
  height: 36px;
  background: var(--color-bg-soft);
  border: 0;
  border-radius: 8px;
  font-size: 20px;
  cursor: pointer;
  color: var(--color-text);
  line-height: 1;
}

.mobile-nav { padding: 68px 0 24px; }

.mobile-nav__group { border-top: 1px solid var(--color-border-light); }
.mobile-nav__group > .mobile-nav__link {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  padding: 16px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.mobile-nav__sublist {
  display: none;
  background: var(--color-bg-soft);
}
.mobile-nav__group.is-open > .mobile-nav__sublist { display: block; }

.mobile-nav__sublist a {
  display: block;
  padding: 12px 24px 12px 48px;
  font-size: 14px;
  color: var(--color-text-secondary);
}

.mobile-nav__cta {
  padding: 20px 24px;
  display: flex;
  gap: 12px;
  border-top: 1px solid var(--color-border-light);
}
.mobile-nav__cta .btn { flex: 1; }

/* ===== Main ===== */
.site-main {
  min-height: calc(100vh - var(--header-height) - 460px);
}

/* ===== Hero ===== */
.hero {
  position: relative;
  padding: 88px 0 96px;
  background:
    radial-gradient(ellipse 80% 55% at 50% 0%, rgba(59, 130, 246, 0.10), transparent 60%),
    linear-gradient(180deg, #ffffff 0%, #f8fafc 100%);
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  left: 50%;
  bottom: -60px;
  transform: translateX(-50%);
  width: 680px;
  height: 680px;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.12) 0%, transparent 70%);
  pointer-events: none;
}
.hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(59, 130, 246, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(59, 130, 246, 0.05) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 60% 60% at 50% 40%, #000 0%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 60% 60% at 50% 40%, #000 0%, transparent 100%);
  pointer-events: none;
}

.hero__inner {
  position: relative;
  z-index: 1;
  max-width: 880px;
  margin: 0 auto;
  text-align: center;
}

.hero__eyebrow {
  display: inline-block;
  color: var(--color-primary);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 4px;
  margin-bottom: 20px;
  padding: 6px 16px;
  background: rgba(59, 130, 246, 0.08);
  border-radius: 999px;
}

.hero__title {
  font-size: clamp(34px, 5vw, 56px);
  font-weight: 800;
  line-height: 1.15;
  margin: 0 0 20px;
  color: var(--color-text);
  background: linear-gradient(135deg, #0f172a 0%, #2563eb 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: -0.5px;
}

.hero__subtitle {
  font-size: 17px;
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin: 0 auto 36px;
  max-width: 640px;
}

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

/* ===== Footer ===== */
.site-footer {
  background: #0e192f;
  color: #999999;
}

/* 三栏布局：左（品牌）+ 中（快捷入口+地址+icon）+ 右（电话）*/
.site-footer__main {
  display: flex;
  gap: 0;
  padding-top: 60px;
  padding-bottom: 24px;
}

.site-footer__left {
  width: 28%;
  padding-right: 36px;
}

.site-footer__middle {
  width: 50%;
  padding-right: 36px;
  border-left: 1px solid rgba(255, 255, 255, 0.12);
  padding-left: 36px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.site-footer__center {
  width: 22%;
  flex: none;
  border-left: 1px solid rgba(255, 255, 255, 0.12);
  padding-left: 36px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.site-footer__brand { margin-bottom: 0; }

.site-footer__logo {
  height: 36px;
  width: auto;
  filter: brightness(0) invert(1);
  margin-bottom: 14px;
}

.site-footer__desc {
  color: rgba(255, 255, 255, 0.5);
  font-size: 13px;
  line-height: 1.8;
  margin: 0;
  max-width: 320px;
}

/* 中栏：业务入口 */
.site-footer__services {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 0;
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.site-footer__service-link {
  color: rgba(255, 255, 255, 0.7);
  font-size: 14px;
  font-weight: 500;
  padding: 0 14px;
  border-left: 1px solid rgba(255, 255, 255, 0.2);
  transition: color var(--transition);
}
.site-footer__service-link:first-child {
  border-left: 0;
  padding-left: 0;
}
.site-footer__service-link:hover {
  color: #ffffff;
}

.site-footer__service-link::before {
  content: '';
  display: inline-block;
  width: 5px;
  height: 5px;
  border-radius: 1px;
  background: var(--color-primary);
  transform: rotate(45deg);
  margin-right: 8px;
  vertical-align: middle;
  opacity: 0.7;
}

/* 中栏：带 icon 的行 */
.site-footer__section-icon {
  width: 16px;
  height: 16px;
  color: rgba(255, 255, 255, 0.45);
  flex-shrink: 0;
  margin-right: 8px;
}

.site-footer__quick {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  font-size: 13px;
  color: #a0aec0;
  line-height: 1.8;
}

.site-footer__addr {
  display: flex;
  align-items: center;
  flex-wrap: nowrap;
  font-size: 12px;
  color: rgba(255, 255, 255, 0.45);
  line-height: 1.7;
}

.site-footer__quick-label {
  color: rgba(255, 255, 255, 0.55);
  font-weight: 500;
  margin-right: 4px;
}

.site-footer__quick a {
  color: #a0aec0;
  transition: color var(--transition);
  padding: 0 10px;
  border-left: 1px solid rgba(255, 255, 255, 0.15);
}
.site-footer__quick a:first-of-type {
  border-left: 0;
  padding-left: 4px;
}
.site-footer__quick a:hover {
  color: #ffffff;
}

/* SEO/GEO 地图入口：面向搜索引擎与 AI 检索，视觉上淡化处理 */
.site-footer__quick--seo .site-footer__section-icon {
  color: rgba(255, 255, 255, 0.25);
}
.site-footer__quick--seo .site-footer__quick-label {
  color: rgba(255, 255, 255, 0.32);
}
.site-footer__quick--seo a {
  color: rgba(255, 255, 255, 0.36);
  border-left-color: rgba(255, 255, 255, 0.1);
}
.site-footer__quick--seo a:hover {
  color: rgba(255, 255, 255, 0.65);
}

/* 右栏：电话 */
.site-footer__tel-head {
  display: flex;
  align-items: center;
  gap: 14px;
}

.site-footer__tel-icon {
  width: 42px;
  height: 42px;
  color: #ffffff;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 10px;
  padding: 9px;
  flex-shrink: 0;
}

.site-footer__tel-title {
  font-size: 12px;
  font-weight: normal;
  color: rgba(255, 255, 255, 0.5);
  margin-bottom: 2px;
}

.site-footer__tel-num {
  font-size: 18px;
  color: #ffffff;
  font-weight: bold;
  letter-spacing: 0.5px;
}

/* 微信 */
.site-footer__wx {
  display: flex;
  align-items: center;
  gap: 14px;
}

.site-footer__wx-img {
  width: 72px;
  height: 72px;
  border-radius: 6px;
  display: block;
}

.site-footer__wx-text {
  color: rgba(255, 255, 255, 0.5);
  font-size: 12px;
  margin: 0;
  line-height: 1.5;
  writing-mode: vertical-rl;
  text-orientation: upright;
  letter-spacing: 2px;
}

/* 底部版权 */
.site-footer__copy {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 14px;
  padding-bottom: 14px;
}

.site-footer__copy p {
  font-size: 12px;
  color: rgba(255, 255, 255, 0.3);
  margin: 0 0 6px;
  line-height: 1.7;
}

.site-footer__copy p:last-child {
  margin-bottom: 0;
}

.site-footer__copy .site-footer__icp {
  float: right;
  color: rgba(255, 255, 255, 0.3);
  font-size: 12px;
}
.site-footer__copy .site-footer__icp:hover {
  color: rgba(255, 255, 255, 0.6);
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .site-nav,
  .site-phone { display: none; }
  .site-header__toggle { display: flex; }
  .container { padding: 0 20px; }

  .site-footer__main {
    flex-direction: column;
    gap: 24px;
  }
  .site-footer__left,
  .site-footer__middle,
  .site-footer__center {
    width: 100%;
    padding-right: 0;
    padding-left: 0;
    border-left: 0;
  }
  .site-footer__middle {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 20px;
  }
  .site-footer__center {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 20px;
  }
}

@media (max-width: 640px) {
  .container { padding: 0 16px; }
  .site-header__actions .btn--primary { display: none; }

  .site-footer__main { padding-top: 28px; }
  .site-footer__copy .site-footer__icp {
    float: none;
    display: block;
    margin-top: 4px;
  }
}