/* ============================================================
   安兴宇联 · 基础样式 v2（浅色主题）
   重置 / 全局 / 导航 / 页脚 / 组件
   文件名称：base.css
   所属项目：安兴宇联官网
   最后更新：2026-08-24
   ============================================================ */

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-cn);
  background: var(--bg-1);
  color: var(--text-1);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { font-family: inherit; cursor: pointer; }
input, textarea, select { font-family: inherit; }

::selection { background: var(--blue); color: #fff; }

/* 滚动条 */
::-webkit-scrollbar { width: 10px; }
::-webkit-scrollbar-track { background: var(--bg-0); }
::-webkit-scrollbar-thumb { background: #d4dae4; border-radius: 5px; }
::-webkit-scrollbar-thumb:hover { background: var(--blue-dim); }

/* 容器 */
.container { width: min(var(--container), 92%); margin-inline: auto; }

/* 区块 */
.section { padding: var(--sp-6) 0; position: relative; }
.section-tight { padding: var(--sp-5) 0; }

/* 标题组 */
.section-head { margin-bottom: var(--sp-4); }
.eyebrow {
  display: inline-flex; align-items: center; gap: 0.6rem;
  font-size: var(--fs-tiny); letter-spacing: 0.28em;
  color: var(--blue); text-transform: uppercase;
}
.eyebrow::before {
  content: ""; width: 28px; height: 2px;
  background: var(--blue); border-radius: 2px;
}
.section-title {
  font-size: var(--fs-h1); font-weight: 700;
  margin-top: 0.6rem; letter-spacing: 0.02em;
  background: linear-gradient(120deg, #1d1d1f 30%, var(--blue) 100%);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
}
/* 与页面主标题同字号的内容区标题 */
.section-title-sm {
  font-size: var(--fs-h2); font-weight: 800;
  margin-top: 0;
}
.section-sub { color: var(--text-2); margin-top: 0.8rem; max-width: 640px; }

/* ============ 导航栏 ============ */
.nav {
  position: fixed; inset: 0 0 auto 0; z-index: 100;
  height: var(--nav-h);
  display: flex; align-items: center;
  background: rgba(255, 255, 255, 0.55);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: background var(--dur) var(--ease-out), height var(--dur) var(--ease-out);
  border-bottom: 1px solid rgba(0, 102, 255, 0.06);
}
.nav.scrolled {
  height: 60px;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom-color: var(--line-1);
  box-shadow: 0 6px 24px rgba(20, 60, 120, 0.06);
}
/* 导航：使用 container 统一边距；菜单靠左，CTA 推到最右 */
.nav-inner { display: flex; align-items: center; justify-content: flex-start; }
.nav-inner > nav { flex: 1; }
.nav-inner .nav-links { display: flex; align-items: center; gap: 0.4rem; margin-left: 1.2rem; }

.nav-logo { display: flex; align-items: center; gap: 0.7rem; }
.nav-logo-mark {
  width: 40px; height: 40px; border-radius: 10px;
  display: grid; place-items: center;
  background: var(--grad-primary);
  box-shadow: var(--shadow-cyan);
  color: #fff;
  object-fit: contain;
}
.nav-logo-name {
  font-family: var(--font-num); font-weight: 700;
  font-size: 1.2rem; letter-spacing: 0.08em;
  color: var(--text-1);
  white-space: nowrap;
}
.nav-logo-name em { font-style: normal; color: var(--blue); font-size: 0.72em; letter-spacing: 0.16em; }

.nav-links { display: flex; align-items: center; gap: 0.4rem; }
.nav-links > li { position: relative; }
/* 菜单 hover 桥接层：覆盖菜单项与弹窗之间的间隙，鼠标可平滑移入二级弹窗 */
.nav-links > li.has-drop::after {
  content: ""; position: absolute;
  top: 100%; left: 0; right: 0;
  height: 24px;
}
.nav-link {
  display: block; padding: 0.5rem 0.9rem;
  font-size: var(--fs-small); color: var(--text-2);
  letter-spacing: 0.04em; border-radius: 6px;
  transition: color 0.25s, background 0.25s;
}
.nav-link:hover, .nav-link.active { color: var(--text-1); background: var(--bg-3); }
.nav-link.active { color: var(--blue); }

/* 下拉菜单（产品）- Apple 风横条面板，仅 hover 展开 */
.nav-drop {
  position: absolute; top: calc(100% + 10px); left: 50%;
  transform: translateX(-50%) translateY(10px);
  width: min(760px, 82vw);
  padding: 1.1rem;
  background: rgba(255, 255, 255, 0.97);
  border: 1px solid var(--line-1); border-radius: var(--radius);
  box-shadow: 0 24px 60px rgba(20, 60, 120, 0.14);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  opacity: 0; visibility: hidden; pointer-events: none;
  transition: opacity 0.28s var(--ease-out), transform 0.28s var(--ease-out), visibility 0.28s;
}
.nav-drop-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 0.4rem;
}
/* 二级项：可含三级子菜单 */
.nav-drop-item-wrap { position: relative; }
.nav-drop-item-wrap > a.nav-drop-item { width: 100%; }
.nav-drop-item {
  display: flex; align-items: center; gap: 0.9rem;
  padding: 0.7rem 0.85rem; border-radius: 10px;
  font-size: var(--fs-small); color: var(--text-2); transition: 0.22s var(--ease-out);
}
a.nav-drop-item:hover { color: var(--blue); background: var(--bg-3); transform: translateX(3px); }
.nav-drop-item .d-icon {
  width: 40px; height: 40px; flex-shrink: 0;
  border-radius: 10px;
  display: grid; place-items: center;
  background:
    radial-gradient(120% 120% at 30% 20%, rgba(255, 255, 255, 0.9), rgba(255, 255, 255, 0) 55%),
    linear-gradient(160deg, rgba(0, 102, 255, 0.12), rgba(0, 102, 255, 0.04));
  border: 1px solid rgba(0, 102, 255, 0.16);
  color: var(--blue);
}
.nav-drop-item .d-icon svg { width: 24px; height: 24px; }
.nav-drop-item .d-info { display: flex; flex-direction: column; gap: 0.15rem; min-width: 0; flex: 1; }
.nav-drop-item .d-info b { font-size: var(--fs-small); color: var(--text-1); font-weight: 600; }
.nav-drop-item .d-info span { font-size: var(--fs-tiny); color: var(--text-3); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.nav-drop-item .tag {
  font-size: 0.6rem; padding: 1px 6px; border-radius: 20px;
  border: 1px solid var(--blue-dim); color: var(--blue);
  background: var(--blue-dim); white-space: nowrap;
}
.nav-drop-item .caret {
  font-size: 0.7rem; color: var(--text-3);
  transition: transform 0.22s var(--ease-out);
}
.nav-drop-item-wrap:hover .caret { transform: rotate(90deg); color: var(--blue); }

/* 三级子菜单（版本列表） */
.nav-sub {
  position: absolute; top: 0; left: calc(100% + 8px);
  width: 240px; padding: 0.6rem;
  background: rgba(255, 255, 255, 0.99);
  border: 1px solid var(--line-1); border-radius: var(--radius-sm);
  box-shadow: 0 16px 44px rgba(20, 60, 120, 0.14);
  opacity: 0; visibility: hidden; pointer-events: none;
  transform: translateX(-8px);
  transition: opacity 0.24s var(--ease-out), transform 0.24s var(--ease-out), visibility 0.24s;
  z-index: 2;
}
.nav-sub a {
  display: flex; align-items: center; gap: 0.7rem;
  padding: 0.55rem 0.75rem; border-radius: 8px;
  font-size: var(--fs-small); color: var(--text-2); transition: 0.2s;
}
.nav-sub a:hover { color: var(--blue); background: var(--bg-3); transform: translateX(3px); }
.nav-sub a .v-num {
  font-family: var(--font-num); font-size: var(--fs-tiny); color: var(--blue);
  opacity: 0.7; min-width: 20px;
}
.nav-drop-item-wrap:hover .nav-sub,
.nav-drop-item-wrap:focus-within .nav-sub {
  opacity: 1; visibility: visible; pointer-events: auto;
  transform: translateX(0);
}
.has-drop:hover .nav-drop,
.has-drop:focus-within .nav-drop {
  opacity: 1; visibility: visible; pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}

/* 汉堡（移动端） */
.nav-burger {
  display: none; flex-direction: column; gap: 5px;
  background: none; border: 0; padding: 8px;
}
.nav-burger span {
  width: 22px; height: 2px; background: var(--text-1);
  border-radius: 2px; transition: 0.3s;
}

/* ============ 按钮 ============ */
.btn {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.75rem 1.6rem;
  border-radius: 8px; font-size: var(--fs-small); font-weight: 600;
  letter-spacing: 0.06em; border: 1px solid transparent;
  transition: all 0.3s var(--ease-out); position: relative; overflow: hidden;
}
/* 导航 CTA 紧凑尺寸（后定义以覆盖 .btn 默认 padding） */
.nav-cta { margin-left: 0.6rem; padding: 0.55rem 1.1rem; font-size: var(--fs-small); }
/* CTA 所在的 li 贴右（menu 靠左、CTA 靠右） */
.nav-links > li:last-child { margin-left: auto; }
.btn-primary {
  background: var(--grad-primary); color: #ffffff;
  box-shadow: var(--shadow-cyan);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 28px var(--blue-glow); }
.btn-ghost { border-color: var(--line-2); color: var(--blue); background: transparent; }
.btn-ghost:hover { background: var(--blue-dim); border-color: var(--blue); }
.btn-warn { background: var(--orange); color: #fff; box-shadow: 0 6px 20px rgba(255, 58, 23, 0.3); }
.btn-warn:hover { transform: translateY(-2px); box-shadow: 0 8px 28px rgba(255, 58, 23, 0.42); }
.btn-lg { padding: 1rem 2.2rem; font-size: 1rem; }
.btn .arrow { transition: transform 0.3s var(--ease-out); }
.btn:hover .arrow { transform: translateX(4px); }

/* ============ 卡片 ============ */
.card {
  background: var(--grad-card);
  border: 1px solid var(--line-1);
  border-radius: var(--radius);
  padding: var(--sp-4);
  position: relative;
  overflow: hidden;
  transition: border-color 0.4s var(--ease-out), transform 0.4s var(--ease-out), box-shadow 0.4s var(--ease-out);
}
.card::before {
  content: ""; position: absolute; inset: 0;
  background: radial-gradient(600px 200px at var(--mx, 50%) 0%, rgba(0, 102, 255, 0.05), transparent 60%);
  opacity: 0; transition: opacity 0.4s;
  pointer-events: none;
}
.card:hover {
  border-color: rgba(0, 102, 255, 0.35);
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
}
.card:hover::before { opacity: 1; }

/* 数字徽标 */
.num-tag {
  font-family: var(--font-num); font-weight: 700;
  font-size: var(--fs-h2); color: var(--blue);
  text-shadow: var(--glow-text);
}

/* 分割线 */
.hr { height: 1px; background: var(--line-1); border: 0; }

/* ============ 页脚（科技感） ============ */
.footer {
  position: relative; overflow: hidden;
  background: linear-gradient(180deg, #f8fafd 0%, #eef3fb 100%);
  border-top: 1px solid rgba(0, 102, 255, 0.12);
  padding: var(--sp-5) 0 0;
}
/* 页脚背景层：网格 + 蓝色光带 */
.footer-bg { position: absolute; inset: 0; pointer-events: none; }
.footer-grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(0, 102, 255, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 102, 255, 0.045) 1px, transparent 1px);
  background-size: 40px 40px;
  mask-image: radial-gradient(ellipse 90% 100% at 50% 100%, #000 30%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse 90% 100% at 50% 100%, #000 30%, transparent 80%);
}
.footer-glow {
  position: absolute; inset: 0;
  background:
    radial-gradient(640px 240px at 12% 100%, rgba(0, 102, 255, 0.08), transparent 60%),
    radial-gradient(560px 220px at 88% 100%, rgba(0, 102, 255, 0.06), transparent 60%);
}
.footer .container { position: relative; z-index: 2; }

.footer-top {
  display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr auto;
  gap: var(--sp-4); padding-bottom: var(--sp-4); align-items: start;
}
.footer-brand .nav-logo-name { color: var(--text-1); }
.footer-desc { color: var(--text-3); font-size: var(--fs-small); margin-top: 0.8rem; max-width: 300px; }
.footer-slogan {
  display: inline-flex; margin-top: 1.1rem;
  font-size: var(--fs-tiny); letter-spacing: 0.3em; color: var(--blue);
  padding: 0.35rem 0.9rem; border-radius: 30px;
  border: 1px solid rgba(0, 102, 255, 0.28);
  background: rgba(0, 102, 255, 0.06);
}
.footer-col h4 {
  font-size: var(--fs-small); color: var(--text-1);
  margin-bottom: 1rem; letter-spacing: 0.1em;
}
.footer-col h4::after {
  content: ""; display: block; width: 22px; height: 2px;
  background: var(--blue); border-radius: 2px; margin-top: 6px;
}
.footer-col ul li { margin-bottom: 0.55rem; }
.footer-col ul a { color: var(--text-3); font-size: var(--fs-small); transition: color 0.25s; }
.footer-col ul a:hover { color: var(--blue); }

/* 二维码：横向排列 */
.footer-qr-wrap {
  display: flex; align-items: center; gap: 1rem;
  padding: 1rem; border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.75);
  border: 1px solid rgba(0, 102, 255, 0.16);
  box-shadow: var(--shadow-card);
}
.footer-qr {
  width: 92px; aspect-ratio: 1; flex-shrink: 0;
  border: 1px solid var(--line-2); border-radius: var(--radius-sm);
  display: grid; place-items: center;
  background:
    repeating-conic-gradient(rgba(0, 102, 255, 0.12) 0 25%, transparent 0 50%) 0 0/9px 9px,
    #fff;
  color: var(--blue); font-size: var(--fs-tiny); font-weight: 600;
}
.footer-qr-text { display: flex; flex-direction: column; gap: 0.3rem; max-width: 110px; }
.footer-qr-text b { font-size: var(--fs-small); color: var(--text-1); }
.footer-qr-text span { font-size: var(--fs-tiny); color: var(--text-3); line-height: 1.5; }

.footer-bottom {
  border-top: 1px solid var(--line-3);
  padding: 1.2rem 0; display: flex; justify-content: space-between;
  flex-wrap: wrap; gap: 0.6rem;
  color: var(--text-3); font-size: var(--fs-tiny);
}
.footer-bottom a { color: var(--text-3); }
.footer-bottom a:hover { color: var(--blue); }
.footer-icp { letter-spacing: 0.04em; }

/* 回到顶部 */
#toTop {
  position: fixed; right: 22px; bottom: 22px; z-index: 90;
  width: 44px; height: 44px; border-radius: 10px;
  background: #ffffff; border: 1px solid var(--line-1);
  color: var(--blue); font-size: 1.1rem;
  box-shadow: var(--shadow-card);
  display: grid; place-items: center;
  opacity: 0; visibility: hidden; transform: translateY(10px);
  transition: 0.35s var(--ease-out);
}
#toTop.show { opacity: 1; visibility: visible; transform: none; }
#toTop:hover { background: var(--blue); color: #fff; }

/* ============ 移动端 ============ */
@media (max-width: 900px) {
  .nav-links {
    position: fixed; top: 0; right: 0; bottom: 0;
    width: min(300px, 78vw); flex-direction: column;
    align-items: stretch; gap: 0.2rem;
    background: #ffffff;
    border-left: 1px solid var(--line-1);
    padding: calc(var(--nav-h) + 10px) 1.2rem 2rem;
    transform: translateX(100%); transition: transform 0.4s var(--ease-out);
  }
  .nav-links.open { transform: none; }
  .nav-links > li { width: 100%; }
  .nav-link { padding: 0.8rem 0.6rem; font-size: 1rem; }
  .nav-drop {
    position: static; transform: none; opacity: 1; visibility: visible;
    box-shadow: none; border: 0; padding: 0; width: 100%;
    max-height: 0; overflow: hidden;
    transition: max-height 0.4s var(--ease-out);
  }
  .nav-drop-grid { grid-template-columns: 1fr; gap: 0.2rem; }
  .has-drop.open .nav-drop { max-height: 720px; }
  /* 移动端三级子菜单：垂直展开 */
  .nav-sub {
    position: static; transform: none; opacity: 1; visibility: visible;
    box-shadow: none; border: 0; padding: 0 0 0 1rem; width: 100%;
    max-height: 0; overflow: hidden;
    transition: max-height 0.4s var(--ease-out);
    background: transparent;
  }
  .nav-drop-item-wrap:hover .nav-sub { max-height: 240px; }
  .nav-drop-item-wrap .caret { transform: rotate(90deg); }
  .nav-cta { margin: 0.8rem 0 0; }
  .nav-burger { display: flex; z-index: 110; }
  .nav-burger.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav-burger.active span:nth-child(2) { opacity: 0; }
  .nav-burger.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
  .footer-top { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 760px) {
  .footer-qr-wrap { justify-content: flex-start; }
}

@media (max-width: 560px) {
  .footer-top { grid-template-columns: 1fr; }
}

/* 减少动效偏好 */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
  html { scroll-behavior: auto; }
}