/* 基础重置 */
* { box-sizing: border-box; }
html,body { margin:0; padding:0; font-family: "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif; color:#222; }
body { line-height:1.55; background:#fff; }
img { max-width:100%; display:block; }
a { color:inherit; text-decoration:none; }
a:hover { text-decoration:underline; }

:root {
  --c-bg-dark:#14161b;
  --c-bg-darker:#111318;
  --c-border:#2d3036;
  --c-text-light:#d0d3d8;
  --c-accent-green:#007d70;
  --c-accent-lime:#3fa800;
  --c-accent-blue:#003e7d;
  --c-accent-grad:linear-gradient(90deg,#008d7a,#00a67a);
  --c-slash:#999;
  --header-height:72px;
}

.container { width:100%; max-width:1240px; margin:0 auto; padding:0 32px; }
.visually-hidden{ position:absolute; width:1px; height:1px; overflow:hidden; clip:rect(1px,1px,1px,1px); white-space:nowrap; }

/* Header */
.site-header { position:fixed; top:0; left:0; right:0; height:var(--header-height); background:rgba(255,255,255,0.9); backdrop-filter: blur(8px); box-shadow:0 2px 4px rgba(0,0,0,.06); z-index:20; }
.header-inner { display:flex; align-items:center; gap:56px; height:100%; }
.brand img { height:46px; width:auto; }
.main-nav ul { list-style:none; margin:0; padding:0; display:flex; gap:40px; }
.main-nav a { font-size:15px; font-weight:500; position:relative; padding:4px 2px; }
.main-nav .current > a::after { content:''; position:absolute; left:0; right:0; bottom:-4px; height:2px; background:var(--c-accent-green); }
.has-sub { position:relative; }
.has-sub .sub { position:absolute; top:100%; left:0; background:#fff; box-shadow:0 8px 24px -8px rgba(0,0,0,.15); list-style:none; padding:8px 0; margin:8px 0 0; min-width:160px; opacity:0; visibility:hidden; transform:translateY(6px); transition:.25s; }
.has-sub:hover .sub { opacity:1; visibility:visible; transform:translateY(0); }
.has-sub .sub li a { display:block; padding:8px 16px; font-size:14px; white-space:nowrap; }
.has-sub .sub li a:hover { background:#f5f7fa; }

/* Hero */
.hero { position:relative; height:720px; display:flex; align-items:center; justify-content:center; margin-top:var(--header-height); }
.hero-bg { position:absolute; inset:0; width:100%; height:100%; object-fit:cover; filter:brightness(.55); }
.hero-overlay { position:relative; z-index:2; text-align:center; color:#fff; padding:24px 32px; backdrop-filter: blur(3px); }
.tag-en { font-style:italic; font-size:18px; letter-spacing:.5px; margin:0 0 12px; color:#f1f3f5; }
.slogan { margin:0; font-size:54px; font-weight:600; letter-spacing:4px; display:flex; flex-wrap:wrap; justify-content:center; gap:4px; line-height:1.15; }
.slogan .word { position:relative; padding:4px 2px; }
.slogan .slashes { font-size:22px; line-height:60px; color:var(--c-slash); margin:0 14px; letter-spacing:-2px; }
.slogan .accent-green { background:var(--c-accent-grad); -webkit-background-clip:text; background-clip:text; color:transparent; }
.slogan .accent-lime { color:var(--c-accent-lime); }
.slogan .accent-blue { color:var(--c-accent-blue); }

/* (主内容区域已移除, 保留占位注释) */

/* Footer */
.site-footer { background:var(--c-bg-dark); color:var(--c-text-light); margin-top:0; font-size:14px; }
.footer-top { display:flex; flex-wrap:wrap; gap:48px; padding:56px 32px 40px; }
.footer-brand-block { display:flex; flex-direction:column; gap:18px; min-width:240px; }
.footer-logo { width:180px; }
.tel { font-size:20px; font-weight:600; margin:0 0 4px; letter-spacing:1px; }
.contact a { color:var(--c-text-light); }
.footer-links { display:flex; flex:1; gap:56px; flex-wrap:wrap; }
.footer-links .col { min-width:140px; }
.footer-links h3 { font-size:15px; margin:0 0 12px; font-weight:600; letter-spacing:1px; color:#fff; }
.footer-links ul { list-style:none; margin:0; padding:0; display:grid; gap:6px; }
.footer-links a { color:var(--c-text-light); transition:.25s; }
.footer-links a:hover { color:#fff; }
/* 已移除二维码模块样式 */
.legal { border-top:1px solid var(--c-border); display:flex; flex-wrap:wrap; align-items:center; justify-content:space-between; gap:24px; padding:20px 32px; background:var(--c-bg-darker); }
.legal p { margin:0; font-size:12px; letter-spacing:.5px; }
.social { list-style:none; margin:0; padding:0; display:flex; gap:20px; }
.icon { width:26px; height:26px; display:inline-block; background:#2d3239; border-radius:50%; position:relative; overflow:hidden; }
.icon::after { content:''; position:absolute; inset:0; margin:auto; width:14px; height:14px; background:linear-gradient(135deg,#45cfa7,#2080d0); mask:radial-gradient(circle at 30% 30%,#000 55%,transparent 56%); -webkit-mask:radial-gradient(circle at 30% 30%,#000 55%,transparent 56%); opacity:.7; }
.icon:hover { background:#3a414b; }

/* 移动端抽屉导航与汉堡按钮 */
.nav-toggle { display:none; background:none; border:0; width:40px; height:40px; position:relative; margin-left:auto; cursor:pointer; }
.nav-toggle .bar,
.nav-toggle .bar::before,
.nav-toggle .bar::after { content:""; position:absolute; left:8px; right:8px; height:2px; background:#222; transition:.25s; }
.nav-toggle .bar { top:50%; transform:translateY(-50%); }
.nav-toggle .bar::before { top:-9px; }
.nav-toggle .bar::after { top:9px; }
body.nav-open .nav-toggle .bar { background:transparent; }
body.nav-open .nav-toggle .bar::before { top:0; transform:rotate(45deg); }
body.nav-open .nav-toggle .bar::after { top:0; transform:rotate(-45deg); }
body.nav-open { overflow:hidden; }

/* 下载图标基础样式（桌面与移动共用） */
.download-list .dl-item { display:flex; align-items:center; gap:8px; line-height:1.4; }
.download-list .dl-ico { width:18px; height:18px; object-fit:contain; display:block; flex-shrink:0; vertical-align:middle; }
/* 强制覆盖更高特指度（确保不会被 .has-sub .sub li a 覆盖） */
.has-sub .download-list li a.dl-item { display:flex; align-items:center; }

@media (max-width:960px) {
  .header-inner { justify-content:space-between; }
  .nav-toggle { display:block; }
  /* 抽屉容器（改为自适应高度的弹出面板） */
  #site-nav.main-nav { position:fixed; z-index:21; top:calc(var(--header-height) + 8px); right:12px; bottom:auto; width:78%; max-width:340px; background:#fff; box-shadow:0 10px 28px -6px rgba(0,0,0,.25); transform:translateX(120%); transition:transform .28s ease; height:auto; max-height:80vh; overflow:hidden; border-radius:12px; }
  body.nav-open #site-nav { transform:translateX(0); }
  /* 遮罩 */
  body.nav-open::after { content:""; position:fixed; inset:0; background:rgba(0,0,0,.35); z-index:19; }
  /* 垂直菜单布局 */
  .main-nav ul { display:flex; flex-direction:column; gap:0; margin:0; padding:4px 0; border-radius:inherit; overflow:hidden; }
  .main-nav li { border-bottom:1px solid #e6e9ec; }
  .main-nav ul > li:last-child { border-bottom:0; }
  .main-nav a { display:block; padding:14px 18px; font-size:15px; }
  /* 子菜单折叠展开 */
  .has-sub .sub { position:static; box-shadow:none; margin:0; padding:0; min-width:auto; opacity:1; visibility:visible; transform:none; max-height:0; overflow:hidden; transition:max-height .25s ease; background:#f1f3f5; border-top:1px solid #dde1e5; }
  .has-sub.open .sub { max-height:480px; }
  .has-sub > a { position:relative; padding-right:34px; font-weight:600; }
  .has-sub > a::after { content:''; position:absolute; right:16px; top:50%; width:8px; height:8px; border-right:2px solid #666; border-bottom:2px solid #666; transform:translateY(-50%) rotate(-45deg); transition:.2s; }
  .has-sub.open > a::after { transform:translateY(-50%) rotate(45deg); }
  /* 颜色与交互 */
  .main-nav a:hover { background:#f5f7fa; }
  .has-sub.open > a { background:#eef1f4; }
  .has-sub .sub li a { padding:10px 26px 10px 40px; font-size:14px; background:transparent; position:relative; }
  .has-sub .sub li + li a { border-top:1px solid rgba(0,0,0,.05); }
  .has-sub .sub li a:hover { background:#fff; }
  /* 轻微渐变提升层次 */
  #site-nav.main-nav { background:linear-gradient(180deg,#ffffff,#f8f9fa); border:1px solid #e3e6ea; }

  /* 覆盖移动端下载项图标左内边距，与统一对齐 */
  .download-list .dl-item { padding-left:18px; }
  .download-list .dl-ico { flex:0 0 18px; }
}
@media (max-width:680px) {
  .slogan { font-size:36px; letter-spacing:2px; }
  .hero { height:520px; }
}
@media (max-width:520px) {
  :root { --header-height:60px; }
  .site-header { height:var(--header-height); }
  .brand img { height:40px; }
  .slogan { font-size:30px; }
  .slogan .slashes { display:none; }
  .footer-top { padding:40px 20px 28px; }
}