/* ============================================================
   星域科技官网 - 科技感视觉系统
   深色霓虹主题 · 玻璃拟态 · 网格/粒子 · H5 响应式
   ============================================================ */

:root {
  --bg-0: #04070f;
  --bg-1: #081126;
  --bg-2: #0d1b3a;
  --panel: rgba(13, 27, 58, .66);

  --cyan:  #38e8ff;
  --blue:  #4d7cff;
  --violet:#8b5cf6;
  --purple:#a855f7;
  --green: #34f5c5;

  --txt-0: #eef4ff;
  --txt-1: #b9c8e6;
  --txt-2: #7d92b8;

  --line: rgba(110, 190, 255, .16);
  --line-strong: rgba(110, 190, 255, .42);

  --grad-main: linear-gradient(92deg, #38e8ff 0%, #4d7cff 55%, #8b5cf6 100%);
  --shadow-glow: 0 0 24px rgba(56, 232, 255, .35);
  --radius: 14px;
  --nav-h: 72px;
  --font: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  color: var(--txt-0);
  background: var(--bg-0);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  min-height: 100vh;
}

/* ---- 全局背景层: 网格 + 光晕 ---- */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(900px 520px at 85% -8%, rgba(139, 92, 246, .16), transparent 60%),
    radial-gradient(800px 520px at -10% 18%, rgba(56, 232, 255, .12), transparent 55%),
    radial-gradient(1000px 700px at 50% 120%, rgba(77, 124, 255, .10), transparent 60%),
    var(--bg-0);
}
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(rgba(110, 190, 255, .05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(110, 190, 255, .05) 1px, transparent 1px);
  background-size: 44px 44px;
  -webkit-mask-image: radial-gradient(ellipse 120% 100% at 50% 0%, #000 30%, transparent 78%);
  mask-image: radial-gradient(ellipse 120% 100% at 50% 0%, #000 30%, transparent 78%);
  pointer-events: none;
}

::selection { background: rgba(56, 232, 255, .28); color: #fff; }

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { font-family: inherit; }

.container { width: min(1200px, 92%); margin-inline: auto; }

.skip-link {
  position: absolute; left: -999px; top: 0;
  background: var(--blue); color: #fff;
  padding: 10px 16px; z-index: 200; border-radius: 0 0 8px 0;
}
.skip-link:focus { left: 0; }

/* ============ 按钮 ============ */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 13px 30px;
  border-radius: 999px;
  font-size: 15px; font-weight: 600;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform .25s ease, box-shadow .25s ease, background .25s ease, border-color .25s ease;
  white-space: nowrap;
}
.btn-primary {
  color: #04101f;
  background: var(--grad-main);
  box-shadow: 0 6px 24px rgba(77, 124, 255, .4);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 10px 34px rgba(56, 232, 255, .5); }
.btn-ghost {
  color: var(--cyan);
  border-color: rgba(56, 232, 255, .5);
  background: rgba(56, 232, 255, .06);
}
.btn-ghost:hover { background: rgba(56, 232, 255, .14); box-shadow: var(--shadow-glow); transform: translateY(-2px); }
.btn-block { width: 100%; }

/* ============ 顶部导航 ============ */
.site-nav {
  position: fixed; top: 0; left: 0; right: 0;
  z-index: 100;
  height: var(--nav-h);
  border-bottom: 1px solid transparent;
  transition: background .3s ease, border-color .3s ease, backdrop-filter .3s ease;
}
.site-nav.scrolled {
  background: rgba(4, 8, 18, .78);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom-color: var(--line);
}
.nav-inner { display: flex; align-items: center; gap: 28px; height: var(--nav-h); }

.brand { display: flex; align-items: center; gap: 10px; margin-right: auto; }
.brand-mark { filter: drop-shadow(0 0 10px rgba(56,232,255,.55)); }
.brand-text { font-size: 19px; font-weight: 800; letter-spacing: .5px; line-height: 1.1; }
.brand-text small { display: block; font-size: 10px; font-weight: 500; letter-spacing: 2.5px; color: var(--txt-2); }

.nav-links { display: flex; align-items: center; gap: 6px; }
.nav-link {
  position: relative;
  padding: 8px 16px;
  font-size: 15px;
  color: var(--txt-1);
  border-radius: 999px;
  transition: color .2s ease, background .2s ease;
}
.nav-link:hover { color: var(--cyan); background: rgba(56,232,255,.07); }
.nav-link.active { color: var(--cyan); }
.nav-link.active::after {
  content: ""; position: absolute; left: 50%; bottom: 0;
  transform: translateX(-50%);
  width: 18px; height: 2px;
  border-radius: 2px;
  background: var(--grad-main);
  box-shadow: 0 0 8px var(--cyan);
}

.nav-cta { padding: 9px 22px; font-size: 14px; }

.nav-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: 0; cursor: pointer; padding: 8px; }
.nav-toggle span { width: 24px; height: 2px; background: var(--txt-0); border-radius: 2px; transition: transform .3s ease, opacity .3s ease; }

/* ============ 通用区块 ============ */
.section { padding: 110px 0; position: relative; }
.section-head { text-align: center; max-width: 760px; margin: 0 auto 58px; }
.section-eyebrow {
  display: inline-flex; align-items: center; gap: 10px;
  font-size: 13px; font-weight: 600; letter-spacing: 3px;
  color: var(--cyan);
  text-transform: uppercase;
  margin-bottom: 14px;
}
.section-eyebrow::before, .section-eyebrow::after {
  content: ""; width: 26px; height: 1px;
  background: linear-gradient(90deg, transparent, var(--cyan));
}
.section-eyebrow::after { background: linear-gradient(90deg, var(--cyan), transparent); }
.section-title { font-size: clamp(26px, 4vw, 42px); font-weight: 800; line-height: 1.25; letter-spacing: .5px; }
.section-title .grad { background: var(--grad-main); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.section-sub { margin-top: 16px; color: var(--txt-2); font-size: 15.5px; }

/* 网格 */
.grid { display: grid; gap: 24px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-2-1 { grid-template-columns: 5fr 4fr; }

/* ============ Hero ============ */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100svh;
  display: flex; align-items: center;
  padding: calc(var(--nav-h) + 40px) 0 90px;
  overflow: hidden;
}
#particles { position: absolute; inset: 0; z-index: 0; }
.hero::after {
  content: "";
  position: absolute; inset: auto 0 0 0; height: 180px;
  background: linear-gradient(180deg, transparent, var(--bg-0));
  z-index: 1; pointer-events: none;
}
.hero .container { position: relative; z-index: 2; }

.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 7px 16px;
  font-size: 13px;
  color: var(--green);
  border: 1px solid rgba(52, 245, 197, .4);
  border-radius: 999px;
  background: rgba(52, 245, 197, .07);
  margin-bottom: 22px;
  animation: fadeUp .8s ease both;
}
.hero-badge .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--green); box-shadow: 0 0 10px var(--green); animation: pulse 2s infinite; }

.hero-title {
  font-size: clamp(34px, 6.4vw, 68px);
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: 1px;
  animation: fadeUp .8s .12s ease both;
}
.hero-title .grad {
  background: var(--grad-main);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-sub {
  margin-top: 22px;
  max-width: 560px;
  font-size: 17px;
  color: var(--txt-1);
  animation: fadeUp .8s .24s ease both;
}

.hero-actions { display: flex; flex-wrap: wrap; gap: 16px; margin-top: 34px; animation: fadeUp .8s .36s ease both; }

.hero-chips { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 34px; animation: fadeUp .8s .48s ease both; }
.hero-chip {
  font-size: 13px; color: var(--txt-1);
  padding: 7px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255,255,255,.025);
}

.hero-scroll {
  position: absolute; left: 50%; bottom: 26px; transform: translateX(-50%);
  z-index: 2;
  width: 22px; height: 36px;
  border: 2px solid rgba(185, 200, 230, .5);
  border-radius: 12px;
}
.hero-scroll::before {
  content: ""; position: absolute; left: 50%; top: 7px;
  width: 4px; height: 7px; border-radius: 3px;
  background: var(--cyan);
  transform: translateX(-50%);
  animation: scrollHint 1.8s ease-in-out infinite;
}

/* ============ 数据指标 ============ */
.stats { padding: 64px 0; }
.stats-inner {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: linear-gradient(180deg, rgba(13,27,58,.5), rgba(13,27,58,.2));
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  padding: 44px 20px;
}
.stat { text-align: center; position: relative; }
.stat + .stat::before {
  content: ""; position: absolute; left: 0; top: 20%; bottom: 20%;
  width: 1px; background: var(--line);
}
.stat-num {
  font-size: clamp(30px, 4.4vw, 46px);
  font-weight: 900;
  font-variant-numeric: tabular-nums;
  background: var(--grad-main);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1.1;
}
.stat-label { margin-top: 6px; font-size: 14px; color: var(--txt-2); }

/* ============ 卡片 ============ */
.card-tech {
  position: relative;
  padding: 34px 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  overflow: hidden;
  transition: transform .3s ease, border-color .3s ease, box-shadow .3s ease;
}
.card-tech::before {
  content: "";
  position: absolute; inset: 0 0 auto 0; height: 2px;
  background: var(--grad-main);
  opacity: 0;
  transition: opacity .3s ease;
}
.card-tech:hover {
  transform: translateY(-6px);
  border-color: var(--line-strong);
  box-shadow: 0 18px 46px rgba(6, 20, 48, .7), 0 0 26px rgba(56, 232, 255, .12);
}
.card-tech:hover::before { opacity: 1; }

.card-ico {
  width: 58px; height: 58px;
  display: grid; place-items: center;
  border-radius: 16px;
  color: var(--cyan);
  background: linear-gradient(135deg, rgba(56,232,255,.14), rgba(139,92,246,.1));
  border: 1px solid rgba(56, 232, 255, .3);
  margin-bottom: 20px;
  box-shadow: inset 0 0 18px rgba(56, 232, 255, .12);
}
.card-tech h3 { font-size: 19px; font-weight: 700; margin-bottom: 10px; }
.card-tech p { color: var(--txt-1); font-size: 14.5px; }
.card-link { display: inline-flex; align-items: center; gap: 6px; margin-top: 18px; font-size: 14px; font-weight: 600; color: var(--cyan); opacity: 0; transform: translateY(4px); transition: opacity .3s ease, transform .3s ease; }
.card-tech:hover .card-link { opacity: 1; transform: translateY(0); }
.card-link:hover { text-shadow: 0 0 12px rgba(56,232,255,.8); }

/* 扫描线能力卡 */
.tech-card { position: relative; overflow: hidden; }
.tech-card::after {
  content: "";
  position: absolute; left: 0; right: 0; height: 60%;
  top: -60%;
  background: linear-gradient(180deg, transparent, rgba(56, 232, 255, .16), transparent);
  transition: top .6s ease;
  pointer-events: none;
}
.tech-card:hover::after { top: 130%; }

/* ============ 产品条 ============ */
.product-row {
  display: grid; grid-template-columns: 1fr 1.6fr; gap: 34px;
  align-items: center;
  padding: 42px 40px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: linear-gradient(120deg, rgba(13,27,58,.72), rgba(13,27,58,.28));
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: border-color .3s ease, box-shadow .3s ease, transform .3s ease;
  margin-bottom: 22px;
}
.product-row:hover { border-color: var(--line-strong); box-shadow: 0 16px 44px rgba(6,20,48,.65), 0 0 24px rgba(139,92,246,.14); transform: translateX(4px); }
.product-row .card-ico { margin-bottom: 0; width: 74px; height: 74px; border-radius: 20px; }
.product-info h3 { font-size: 22px; font-weight: 800; }
.product-info .sub { color: var(--cyan); font-size: 14px; letter-spacing: 1px; margin: 4px 0 10px; }
.product-info .summary { color: var(--txt-1); font-size: 15px; }
.product-feats { margin-top: 14px; display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px 18px; }
.product-feats li { font-size: 14px; color: var(--txt-1); display: flex; gap: 8px; align-items: flex-start; }
.product-feats li::before { content: "◆"; color: var(--cyan); font-size: 9px; margin-top: 6px; }

/* ============ CTA 横幅 ============ */
.cta-banner {
  position: relative;
  text-align: center;
  padding: 74px 40px;
  border: 1px solid var(--line-strong);
  border-radius: 24px;
  overflow: hidden;
  background:
    radial-gradient(560px 300px at 20% 0%, rgba(56,232,255,.14), transparent 60%),
    radial-gradient(560px 300px at 85% 100%, rgba(139,92,246,.16), transparent 60%),
    linear-gradient(120deg, #0a1a3c, #0d0b2c);
}
.cta-banner::before {
  content: ""; position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(110,190,255,.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(110,190,255,.06) 1px, transparent 1px);
  background-size: 34px 34px;
  -webkit-mask-image: radial-gradient(ellipse 90% 90% at 50% 50%, #000, transparent);
  mask-image: radial-gradient(ellipse 90% 90% at 50% 50%, #000, transparent);
}
.cta-banner h2 { position: relative; font-size: clamp(24px, 3.6vw, 38px); font-weight: 800; }
.cta-banner p { position: relative; color: var(--txt-1); margin: 14px auto 30px; max-width: 520px; }
.cta-banner .btn { position: relative; }

/* ============ 新闻 ============ */
.news-card {
  display: block;
  padding: 26px 26px 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: border-color .3s ease, transform .3s ease, box-shadow .3s ease;
}
.news-card:hover { border-color: var(--line-strong); transform: translateY(-5px); box-shadow: 0 16px 40px rgba(6,20,48,.7); }
.news-meta { display: flex; align-items: center; gap: 12px; font-size: 12.5px; color: var(--txt-2); margin-bottom: 12px; }
.news-date { color: var(--cyan); font-variant-numeric: tabular-nums; }
.news-card h3 { font-size: 17px; font-weight: 700; line-height: 1.45; margin-bottom: 8px; transition: color .2s ease; }
.news-card:hover h3 { color: var(--cyan); }
.news-card p { font-size: 14px; color: var(--txt-1); }

/* 页内列表式新闻 */
.news-list-item {
  display: flex; gap: 22px; align-items: baseline;
  padding: 22px 6px;
  border-bottom: 1px solid var(--line);
  transition: background .2s ease;
}
.news-list-item:hover { background: rgba(56,232,255,.04); }
.news-list-item .d { flex: 0 0 110px; font-size: 13px; color: var(--cyan); font-variant-numeric: tabular-nums; }
.news-list-item h3 { font-size: 17px; }
.news-list-item .sum { color: var(--txt-2); font-size: 14px; margin-top: 3px; }

/* ============ 关于页 ============ */
.feat-list { margin-top: 24px; display: grid; gap: 14px; }
.feat-list li { display: flex; gap: 12px; color: var(--txt-1); font-size: 15px; }
.feat-list li::before { content: "✔"; color: var(--green); }

.value-grid { text-align: center; padding: 30px 18px; }
.value-grid h3 { font-size: 18px; margin: 14px 0 8px; }
.value-grid p { font-size: 13.5px; color: var(--txt-2); }

.timeline { position: relative; padding-left: 26px; }
.timeline::before { content: ""; position: absolute; left: 6px; top: 8px; bottom: 8px; width: 1px; background: linear-gradient(180deg, var(--cyan), var(--violet)); }
.tl-item { position: relative; padding: 0 0 30px 18px; }
.tl-item::before { content: ""; position: absolute; left: -23px; top: 8px; width: 11px; height: 11px; border-radius: 50%; background: var(--bg-0); border: 2px solid var(--cyan); box-shadow: 0 0 10px var(--cyan); }
.tl-item b { display: block; color: var(--cyan); font-size: 14px; letter-spacing: 1px; }
.tl-item h4 { font-size: 17px; margin: 4px 0 4px; }
.tl-item p { color: var(--txt-1); font-size: 14px; }

/* ============ 表单 ============ */
.form-card {
  padding: 40px 36px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: var(--panel);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.form-group { margin-bottom: 18px; }
.form-group label { display: block; font-size: 14px; color: var(--txt-1); margin-bottom: 8px; font-weight: 600; }
.form-group label i { color: var(--cyan); font-style: normal; }
.form-control {
  width: 100%;
  padding: 13px 16px;
  font-size: 15px;
  color: var(--txt-0);
  background: rgba(4, 10, 22, .6);
  border: 1px solid var(--line);
  border-radius: 10px;
  outline: none;
  transition: border-color .2s ease, box-shadow .2s ease;
  font-family: inherit;
}
.form-control:focus { border-color: var(--cyan); box-shadow: 0 0 0 3px rgba(56, 232, 255, .14), 0 0 18px rgba(56, 232, 255, .18); }
textarea.form-control { resize: vertical; min-height: 130px; }
.form-error { color: #f87171; font-size: 13px; margin-top: 6px; }
.form-ok { color: var(--green); font-size: 14px; margin-top: 14px; }
.form-note { font-size: 12.5px; color: var(--txt-2); margin-top: 12px; }

/* 联系信息卡 */
.contact-item {
  display: flex; gap: 18px; align-items: flex-start;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(13, 27, 58, .4);
  margin-bottom: 16px;
}
.contact-item .card-ico { width: 48px; height: 48px; margin-bottom: 0; border-radius: 13px; }
.contact-item b { display: block; font-size: 16px; margin-bottom: 3px; }
.contact-item p { color: var(--txt-1); font-size: 14px; word-break: break-all; }

/* ============ 面包屑/页头 ============ */
.page-hero { padding: calc(var(--nav-h) + 70px) 0 60px; text-align: center; position: relative; }
.page-hero h1 { font-size: clamp(30px, 5vw, 48px); font-weight: 900; }
.page-hero p { color: var(--txt-2); margin-top: 12px; font-size: 16px; }

/* ============ 分页 ============ */
.pagination { display: flex; justify-content: center; gap: 8px; margin-top: 44px; flex-wrap: wrap; }
.pagination a, .pagination span {
  min-width: 40px; height: 40px;
  display: inline-flex; align-items: center; justify-content: center;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  font-size: 14px;
  color: var(--txt-1);
  transition: all .2s ease;
}
.pagination a:hover { border-color: var(--cyan); color: var(--cyan); }
.pagination .cur { background: var(--grad-main); color: #04101f; font-weight: 700; border-color: transparent; }

/* ============ 详情页 ============ */
.prose {
  font-size: 15.5px; color: var(--txt-1); line-height: 2;
}
.prose h2 { font-size: 22px; color: var(--txt-0); margin: 30px 0 14px; }
.prose p { margin-bottom: 16px; }
.prose ul { margin: 0 0 16px; }
.prose ul li { position: relative; padding-left: 20px; margin-bottom: 8px; }
.prose ul li::before { content: "◆"; position: absolute; left: 0; top: 2px; color: var(--cyan); font-size: 10px; }

/* ============ 页脚 ============ */
.site-footer { position: relative; margin-top: 40px; border-top: 1px solid var(--line); background: rgba(3, 6, 15, .7); }
.glow-line { height: 1px; background: linear-gradient(90deg, transparent, rgba(56,232,255,.6), rgba(139,92,246,.6), transparent); }
.footer-grid {
  display: grid; grid-template-columns: 2fr 1fr 1.4fr; gap: 40px;
  padding: 64px 0 46px;
}
.footer-logo { display: flex; align-items: center; gap: 10px; font-size: 18px; }
.footer-brief { color: var(--txt-2); font-size: 14px; margin-top: 16px; max-width: 320px; }
.site-footer h4 { font-size: 15px; font-weight: 700; margin-bottom: 18px; letter-spacing: 1px; }
.site-footer ul li { margin-bottom: 11px; }
.site-footer ul a { color: var(--txt-1); font-size: 14.5px; transition: color .2s ease; }
.site-footer ul a:hover { color: var(--cyan); }
.footer-contact li { display: flex; gap: 10px; align-items: flex-start; color: var(--txt-1); font-size: 14px; }
.footer-contact .icon-ico { flex: 0 0 auto; margin-top: 3px; }
.footer-bottom { border-top: 1px solid var(--line); padding: 20px 0; }
.footer-bottom .container { display: flex; flex-wrap: wrap; gap: 8px 26px; align-items: center; font-size: 13px; color: var(--txt-2); }
.footer-admin { margin-left: auto; color: var(--txt-2); opacity: .6; }
.footer-admin:hover { color: var(--cyan); opacity: 1; }

/* ============ 动画 ============ */
@keyframes fadeUp { from { opacity: 0; transform: translateY(26px); } to { opacity: 1; transform: none; } }
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: .35; } }
@keyframes scrollHint { 0% { opacity: 1; transform: translate(-50%, 0); } 70% { opacity: 0; transform: translate(-50%, 10px); } 100% { opacity: 0; } }
@keyframes floatY { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-14px); } }

.reveal { opacity: 0; transform: translateY(30px); transition: opacity .7s ease, transform .7s ease; }
.reveal.in { opacity: 1; transform: none; }

/* ============ 响应式 ============ */
@media (max-width: 992px) {
  .nav-cta { display: none; }
  .nav-toggle { display: flex; }
  .nav-links {
    position: fixed; top: var(--nav-h); left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 4px;
    padding: 18px 6vw 26px;
    background: rgba(4, 8, 18, .96);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--line);
    transform: translateY(-18px);
    opacity: 0; visibility: hidden;
    transition: opacity .28s ease, transform .28s ease, visibility .28s;
  }
  .nav-links.open { opacity: 1; visibility: visible; transform: none; }
  .nav-link { font-size: 17px; padding: 13px 16px; }
  .nav-link.active::after { left: 16px; transform: none; width: 18px; }
  .nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav-toggle.open span:nth-child(2) { opacity: 0; }
  .nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

  .stats-inner { grid-template-columns: repeat(2, 1fr); gap: 34px 12px; }
  .stat:nth-child(3)::before { display: none; }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .grid-2-1 { grid-template-columns: 1fr; }
  .product-row { grid-template-columns: 1fr; padding: 30px 24px; }
  .product-feats { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 640px) {
  .section { padding: 80px 0; }
  .section-head { margin-bottom: 40px; }
  .grid-2, .grid-3, .grid-4, .form-row { grid-template-columns: 1fr; }
  .product-feats { grid-template-columns: 1fr; }
  .form-card { padding: 28px 20px; }
  .news-list-item { flex-direction: column; gap: 4px; }
  .news-list-item .d { flex: none; }
  .hero { padding-top: calc(var(--nav-h) + 30px); }
  .hero-actions .btn { flex: 1 1 auto; }
  .cta-banner { padding: 54px 20px; }
  .footer-grid { grid-template-columns: 1fr; gap: 30px; padding: 46px 0 34px; }
  .footer-bottom .container { justify-content: center; text-align: center; }
  .footer-admin { margin-left: 0; }
  .stat-label { font-size: 12.5px; }
}

/* 尊重减弱动效偏好 */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; }
}