/* ============================================================
   鼎烽网络存储系统 · 官网设计系统
   配色：深蓝 #0A1E38 / 卡片 #101F3C / 科技青 #39C6DC / 琥珀金 #F5B841
   字体：Noto Sans SC（SIL OFL 可商用）
   ============================================================ */

@font-face { font-family: 'Noto Sans SC'; src: url('fonts/NotoSansSC-Regular.woff2') format('woff2'), url('fonts/NotoSansSC-Regular.ttf') format('truetype'); font-weight: 400; font-display: swap; }
@font-face { font-family: 'Noto Sans SC'; src: url('fonts/NotoSansSC-Medium.woff2') format('woff2'), url('fonts/NotoSansSC-Medium.ttf') format('truetype'); font-weight: 500; font-display: swap; }
@font-face { font-family: 'Noto Sans SC'; src: url('fonts/NotoSansSC-Bold.woff2') format('woff2'), url('fonts/NotoSansSC-Bold.ttf') format('truetype'); font-weight: 700; font-display: swap; }

:root {
  --bg: #0A1E38;
  --bg-soft: #0C2140;
  --panel: #101F3C;
  --panel-2: #132A4D;
  --border: #1E3A5C;
  --text: #FFFFFF;
  --t2: #C9D8EC;
  --t3: #9FB6D4;
  --muted: #6E89AC;
  --cyan: #39C6DC;
  --cyan-2: #7FD4E4;
  --gold: #F5B841;
  --ink: #08243F;
  --radius: 14px;
  --nav-h: 72px;
  --shadow: 0 18px 40px rgba(0, 0, 0, 0.35);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* ---------- 顶部金青双色线（品牌识别元素） ---------- */
.topline {
  position: fixed; top: 0; left: 0; right: 0; height: 4px; z-index: 1001;
  background: linear-gradient(90deg, var(--gold) 0%, var(--gold) 22%, var(--cyan) 22%, var(--cyan) 100%);
}

/* ---------- 导航 ---------- */
.nav {
  position: fixed; top: 4px; left: 0; right: 0; z-index: 1000;
  background: rgba(10, 30, 56, 0.82);
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(30, 58, 92, 0.7);
  transition: background 0.3s;
}
.nav-inner { max-width: 1280px; margin: 0 auto; padding: 0 24px; height: var(--nav-h); display: flex; align-items: center; gap: 28px; }
.nav-logo { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.nav-logo svg { width: 38px; height: 38px; }
.nav-logo .lt { line-height: 1.25; }
.nav-logo .lt b { font-size: 17px; letter-spacing: 2px; font-weight: 700; display: block; }
.nav-logo .lt span { font-size: 10px; color: var(--muted); letter-spacing: 2.2px; display: block; }
.nav-links { display: flex; gap: 4px; margin-left: auto; }
.nav-links a {
  position: relative; padding: 8px 14px; font-size: 14.5px; color: var(--t2);
  border-radius: 8px; transition: color 0.2s, background 0.2s; white-space: nowrap;
}
.nav-links a:hover { color: #fff; background: rgba(57, 198, 220, 0.08); }
.nav-links a.active { color: var(--cyan); font-weight: 500; }
.nav-links a.active::after {
  content: ''; position: absolute; left: 14px; right: 14px; bottom: 2px; height: 2px;
  background: var(--cyan); border-radius: 2px;
}
.nav-cta { display: flex; align-items: center; gap: 16px; flex-shrink: 0; }
.nav-phone { font-size: 15px; font-weight: 700; color: var(--gold); letter-spacing: 0.5px; display: flex; align-items: center; gap: 6px; white-space: nowrap; }
.nav-phone svg { width: 16px; height: 16px; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 10px 22px; border-radius: 10px; font-size: 14.5px; font-weight: 500;
  border: 1px solid transparent; cursor: pointer; transition: transform 0.2s, box-shadow 0.2s, background 0.2s, border-color 0.2s;
  white-space: nowrap;
}
.btn-cyan { background: var(--cyan); color: var(--ink); font-weight: 700; }
.btn-cyan:hover { transform: translateY(-2px); box-shadow: 0 10px 24px rgba(57, 198, 220, 0.35); }
.btn-ghost { border-color: var(--cyan); color: var(--cyan); background: transparent; }
.btn-ghost:hover { background: rgba(57, 198, 220, 0.1); transform: translateY(-2px); }
.btn-gold { background: var(--gold); color: var(--ink); font-weight: 700; }
.btn-gold:hover { transform: translateY(-2px); box-shadow: 0 10px 24px rgba(245, 184, 65, 0.3); }
.btn-lg { padding: 14px 32px; font-size: 16px; border-radius: 12px; }
.nav-burger { display: none; margin-left: auto; background: none; border: 1px solid var(--border); border-radius: 8px; padding: 8px 10px; cursor: pointer; }
.nav-burger svg { width: 20px; height: 20px; stroke: var(--t2); }

/* ---------- 通用板块 ---------- */
.section { padding: 96px 0; position: relative; }
.section.soft { background: var(--bg-soft); }
.section-head { max-width: 760px; margin-bottom: 48px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.sec-label { display: flex; align-items: center; gap: 12px; margin-bottom: 14px; }
.section-head.center .sec-label { justify-content: center; }
.sec-label .bar { width: 6px; height: 20px; background: var(--gold); border-radius: 3px; }
.sec-label .en { font-size: 12px; letter-spacing: 3px; color: var(--muted); font-weight: 500; }
.section-title { font-size: 34px; font-weight: 700; letter-spacing: 1px; line-height: 1.3; }
.section-title .cyan { color: var(--cyan); }
.section-desc { margin-top: 14px; font-size: 15.5px; color: var(--t3); }

/* ---------- 卡片 ---------- */
.grid { display: grid; gap: 20px; }
.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-5 { grid-template-columns: repeat(5, 1fr); }
.card {
  background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 28px 24px; transition: transform 0.25s, border-color 0.25s, box-shadow 0.25s;
}
.card:hover { transform: translateY(-5px); border-color: rgba(57, 198, 220, 0.55); box-shadow: var(--shadow); }
.card .ic { width: 46px; height: 46px; margin-bottom: 16px; }
.card h3 { font-size: 17px; font-weight: 700; margin-bottom: 10px; letter-spacing: 0.5px; }
.card p { font-size: 13.5px; color: var(--t3); line-height: 1.75; }
.card .kw { margin-top: 14px; display: flex; flex-wrap: wrap; gap: 6px; }
.kw span, .pill {
  font-size: 12px; color: var(--cyan-2); background: rgba(57, 198, 220, 0.1);
  border: 1px solid rgba(57, 198, 220, 0.25); padding: 3px 10px; border-radius: 999px; white-space: nowrap;
}
.pill.gold { color: var(--gold); background: rgba(245, 184, 65, 0.1); border-color: rgba(245, 184, 65, 0.3); }

/* 通用要点列表（案例卡 / 解决方案卡内的条目，带青色小方点前导） */
.li { position: relative; padding-left: 16px; font-size: 13.5px; color: var(--t3); margin-bottom: 8px; line-height: 1.7; }
.li::before { content: ''; position: absolute; left: 0; top: 10px; width: 6px; height: 6px; border-radius: 2px; background: var(--cyan); }

/* ---------- 首页 Hero ---------- */
.hero {
  position: relative; padding: calc(var(--nav-h) + 76px) 0 0; overflow: hidden;
  background:
    radial-gradient(1250px 880px at 84% 150px, rgba(57, 198, 220, 0.13), transparent 66%),
    radial-gradient(950px 620px at 8% 620px, rgba(57, 198, 220, 0.08), transparent 66%),
    var(--bg);
}
.hero .watermark {
  position: absolute; right: -60px; top: 40px; font-size: 480px; line-height: 1;
  color: rgba(57, 198, 220, 0.045); font-weight: 700; user-select: none; pointer-events: none; z-index: 0;
}
.hero-inner { position: relative; z-index: 1; display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 56px; align-items: center; }
.hero-tag {
  display: inline-flex; align-items: center; gap: 8px; font-size: 13px; letter-spacing: 2px;
  color: var(--cyan-2); border: 1px solid rgba(57, 198, 220, 0.4); border-radius: 999px; padding: 6px 16px;
  background: rgba(57, 198, 220, 0.08);
}
.hero-tag .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--gold); }
.hero h1 { font-size: 54px; font-weight: 700; letter-spacing: 4px; margin: 24px 0 18px; line-height: 1.2; }
.hero h1 .accent { color: var(--cyan); }
.hero .sub { font-size: 17px; color: var(--t2); max-width: 560px; line-height: 1.9; }
.hero .sub b { color: var(--gold); font-weight: 500; }
.hero-actions { display: flex; gap: 16px; margin-top: 34px; flex-wrap: wrap; }
.hero-points { display: flex; gap: 22px; margin-top: 34px; flex-wrap: wrap; }
.hero-points div { display: flex; align-items: center; gap: 8px; font-size: 13.5px; color: var(--t3); }
.hero-points svg { width: 16px; height: 16px; flex-shrink: 0; }

.hero-visual { position: relative; height: 460px; }
.hero-visual .glow {
  position: absolute; left: 50%; bottom: 10px; transform: translateX(-50%);
  width: 110%; height: 55%; background: radial-gradient(ellipse at center, rgba(57, 198, 220, 0.25), transparent 70%);
}
.hero-visual img { position: absolute; object-fit: contain; filter: drop-shadow(0 16px 30px rgba(0, 0, 0, 0.5)); }
/* 画册封面同构布局：三台机架 左上小淡 → 右侧中号 → 底部居中最大，对角阶梯、无遮挡 */
.hero-visual .hv-r1 { width: 40%; left: 2%; top: 20%; opacity: 0.5; }
.hero-visual .hv-r2 { width: 54%; right: 2%; top: 44%; opacity: 0.72; }
.hero-visual .hv-r3 { width: 78%; left: 50%; transform: translateX(-50%); bottom: 4%; }

/* 数据条（并入 Hero 背景层：容器透明、无边框，宽度与 .container 栏目一致） */
.stats { position: relative; z-index: 1; max-width: 1200px; margin: 0 auto; padding: 0 0 62px; background: transparent; }
.stats-inner { padding: 0 24px; display: grid; grid-template-columns: repeat(4, 1fr); }
.stat { padding: 34px 24px; text-align: center; border-left: 1px solid var(--border); }
.stat:first-child { border-left: none; }
.stat b { font-size: 34px; font-weight: 700; color: var(--cyan); display: block; letter-spacing: 1px; }
.stat b .gold { color: var(--gold); }
.stat span { font-size: 13px; color: var(--t3); letter-spacing: 1px; }

/* ---------- 产品形态卡（图片卡） ---------- */
.prod-card { padding: 22px 18px; text-align: center; display: flex; flex-direction: column; align-items: center; }
.prod-card .dev { height: 110px; width: 100%; display: flex; align-items: center; justify-content: center; margin-bottom: 14px; }
.prod-card .dev img { max-width: 100%; max-height: 100%; object-fit: contain; filter: drop-shadow(0 8px 16px rgba(0,0,0,0.4)); }
.prod-card h3 { font-size: 15.5px; margin-bottom: 4px; }
.prod-card .model { font-size: 13px; color: var(--cyan); font-weight: 500; letter-spacing: 1px; }
.prod-card .spec { font-size: 12px; color: var(--t3); margin-top: 8px; line-height: 1.6; }
.prod-card .more { margin-top: 12px; font-size: 12.5px; color: var(--cyan-2); display: inline-flex; align-items: center; gap: 4px; }

/* ---------- 分栏图文 ---------- */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; }
.split.rev > .split-media { order: 2; }
.split-media { position: relative; border-radius: var(--radius); overflow: hidden; border: 1px solid var(--border); box-shadow: var(--shadow); }
.split-media img { width: 100%; height: 100%; object-fit: cover; }
.split-media .cap {
  position: absolute; left: 0; right: 0; bottom: 0; padding: 10px 16px;
  background: rgba(8, 22, 42, 0.82); font-size: 12px; color: var(--t2); letter-spacing: 1.5px;
}
.split-body h3 { font-size: 26px; font-weight: 700; margin-bottom: 16px; letter-spacing: 1px; }
.split-body > p { font-size: 14.5px; color: var(--t3); margin-bottom: 22px; }
.check-list li { display: flex; gap: 12px; margin-bottom: 14px; font-size: 14.5px; color: var(--t2); }
.check-list svg { width: 20px; height: 20px; flex-shrink: 0; margin-top: 3px; }
.check-list b { color: #fff; font-weight: 500; }

/* ---------- 流程步骤 ---------- */
.flow { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; counter-reset: step; }
.flow-5 { grid-template-columns: repeat(5, 1fr); }
.flow-6 { grid-template-columns: repeat(6, 1fr); }
.step { position: relative; background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); padding: 26px 22px; }
.step .no {
  width: 38px; height: 38px; border-radius: 50%; display: flex; align-items: center; justify-content: center;
  background: rgba(57, 198, 220, 0.12); border: 1px solid rgba(57, 198, 220, 0.45);
  color: var(--cyan); font-weight: 700; font-size: 15px; margin-bottom: 14px;
}
.step h4 { font-size: 15.5px; margin-bottom: 8px; }
.step p { font-size: 13px; color: var(--t3); line-height: 1.7; }
.step::after {
  content: '→'; position: absolute; right: -16px; top: 38px; color: var(--gold); font-size: 18px; z-index: 1;
}
.step:last-child::after { display: none; }

/* ---------- 规格对比表 ---------- */
.table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--radius); }
table.spec { width: 100%; border-collapse: collapse; font-size: 13.5px; min-width: 860px; background: var(--panel); }
table.spec th, table.spec td { padding: 14px 16px; text-align: center; border-bottom: 1px solid var(--border); border-left: 1px solid var(--border); }
table.spec th:first-child, table.spec td:first-child { border-left: none; text-align: left; background: var(--panel-2); color: var(--cyan-2); font-weight: 500; white-space: nowrap; }
table.spec thead th { background: var(--panel-2); color: #fff; font-weight: 700; letter-spacing: 1px; border-bottom: 2px solid var(--cyan); }
table.spec tbody tr:hover td { background: rgba(57, 198, 220, 0.05); }
table.spec tbody tr:hover td:first-child { background: var(--panel-2); }
table.spec .hl { color: var(--cyan); font-weight: 500; }
table.spec .gd { color: var(--gold); font-weight: 500; }

/* ---------- 徽标阵列（信创生态） ---------- */
.eco-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.eco-item {
  display: flex; align-items: center; gap: 14px; padding: 18px 20px;
  background: var(--panel); border: 1px solid var(--border); border-radius: 12px; transition: border-color 0.2s, transform 0.2s;
}
.eco-item:hover { border-color: rgba(57, 198, 220, 0.5); transform: translateY(-3px); }
.eco-item .star { color: var(--gold); font-size: 18px; }
.eco-item b { display: block; font-size: 14.5px; font-weight: 500; }
.eco-item span { font-size: 12px; color: var(--muted); }

/* ---------- 案例卡 ---------- */
.case-card { padding: 30px 28px; }
.case-card .kicker { font-size: 12px; letter-spacing: 2.5px; color: var(--gold); font-weight: 500; margin-bottom: 10px; }
.case-card h3 { font-size: 19px; margin-bottom: 14px; }
.case-card .li { position: relative; padding-left: 16px; font-size: 13.5px; color: var(--t3); margin-bottom: 8px; line-height: 1.7; }
.case-card .li::before { content: ''; position: absolute; left: 0; top: 10px; width: 6px; height: 6px; border-radius: 2px; background: var(--cyan); }
.keystat { display: flex; gap: 12px; margin-top: 20px; padding-top: 18px; border-top: 1px solid var(--border); }
.keystat > div { flex: 1; text-align: center; }
.keystat b { display: block; font-size: 22px; color: var(--cyan); font-weight: 700; }
.keystat b.gold { color: var(--gold); }
.keystat span { font-size: 11.5px; color: var(--t3); }

/* ---------- 场景卡 ---------- */
.scene-card { overflow: hidden; padding: 0; display: flex; flex-direction: column; }
.scene-card .sc-media { height: 170px; overflow: hidden; }
.scene-card .sc-media img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s; }
.scene-card:hover .sc-media img { transform: scale(1.05); }
.scene-card .sc-body { padding: 22px 22px 24px; }
.scene-card h3 { font-size: 16.5px; margin-bottom: 8px; }
.scene-card p { font-size: 13px; color: var(--t3); }

/* ---------- CTA 横幅 ---------- */
.cta-band { position: relative; overflow: hidden; background: linear-gradient(120deg, #0F2C52 0%, #0A1E38 60%, #0C2A48 100%); border: 1px solid var(--border); border-radius: 20px; padding: 56px; }
.cta-band .wm { position: absolute; right: -30px; bottom: -70px; font-size: 240px; line-height: 1; color: rgba(57,198,220,0.05); font-weight: 700; user-select: none; }
.cta-inner { position: relative; z-index: 1; display: flex; align-items: center; gap: 48px; }
.cta-inner .cta-text { flex: 1; }
.cta-inner h2 { font-size: 30px; font-weight: 700; letter-spacing: 1px; margin-bottom: 12px; }
.cta-inner p { color: var(--t3); font-size: 15px; margin-bottom: 26px; max-width: 560px; }
.cta-qr { text-align: center; flex-shrink: 0; }
.cta-qr img { width: 118px; height: 118px; border-radius: 12px; border: 3px solid rgba(57, 198, 220, 0.4); }
.cta-qr div { font-size: 12px; color: var(--t3); margin-top: 10px; line-height: 1.6; }

/* ---------- 页脚 ---------- */
.footer { border-top: 1px solid var(--border); background: #081A30; padding: 64px 0 0; margin-top: 0; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr 1.2fr; gap: 40px; padding-bottom: 48px; }
.footer-brand .fb-logo { display: flex; align-items: center; gap: 10px; margin-bottom: 16px; }
.footer-brand .fb-logo svg { width: 34px; height: 34px; }
.footer-brand .fb-logo b { font-size: 16px; letter-spacing: 2px; }
.footer-brand p { font-size: 13px; color: var(--muted); line-height: 1.9; max-width: 300px; }
.footer h4 { font-size: 14.5px; letter-spacing: 1.5px; margin-bottom: 18px; color: #fff; }
.footer-col a { display: block; font-size: 13.5px; color: var(--t3); margin-bottom: 10px; transition: color 0.2s; }
.footer-col a:hover { color: var(--cyan); }
.footer-contact div { font-size: 13.5px; color: var(--t3); margin-bottom: 10px; display: flex; gap: 8px; }
.footer-contact b { color: var(--gold); font-weight: 500; }
.footer-bottom { border-top: 1px solid var(--border); padding: 20px 0; display: flex; justify-content: space-between; align-items: center; gap: 16px; flex-wrap: wrap; }
.footer-bottom span { font-size: 12.5px; color: var(--muted); letter-spacing: 0.5px; }

/* ---------- 内页页头 ---------- */
.page-hero { position: relative; padding: calc(var(--nav-h) + 64px) 0 64px; overflow: hidden; background: radial-gradient(800px 400px at 80% 0%, rgba(57,198,220,0.1), transparent 60%), var(--bg); border-bottom: 1px solid var(--border); }
.page-hero .watermark { position: absolute; right: -40px; top: -60px; font-size: 320px; line-height: 1; color: rgba(57, 198, 220, 0.04); font-weight: 700; user-select: none; pointer-events: none; }
.page-hero .crumb { font-size: 13px; color: var(--muted); letter-spacing: 1px; margin-bottom: 14px; }
.page-hero .crumb a:hover { color: var(--cyan); }
.page-hero h1 { font-size: 40px; font-weight: 700; letter-spacing: 2px; position: relative; z-index: 1; }
.page-hero h1 .cyan { color: var(--cyan); }
.page-hero .lead { margin-top: 14px; font-size: 15.5px; color: var(--t3); max-width: 720px; position: relative; z-index: 1; }

/* ---------- 产品详情行（产品中心） ---------- */
.prod-row { display: grid; grid-template-columns: 300px 1fr; gap: 40px; align-items: center; padding: 36px 32px; }
.prod-row + .prod-row { margin-top: 20px; }
.prod-row .pr-media { height: 190px; display: flex; align-items: center; justify-content: center; }
.prod-row .pr-media img { max-width: 100%; max-height: 100%; object-fit: contain; filter: drop-shadow(0 12px 22px rgba(0,0,0,0.45)); }
.prod-row .pr-media.landscape img { border-radius: 10px; }
.prod-row h3 { font-size: 20px; margin-bottom: 6px; display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.prod-row h3 .model { font-size: 13px; color: var(--cyan); border: 1px solid rgba(57,198,220,0.4); padding: 2px 10px; border-radius: 999px; letter-spacing: 1px; }
.prod-row .pos { font-size: 13px; color: var(--gold); margin-bottom: 14px; letter-spacing: 1px; }
.prod-row .spec-chips { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 14px; }
.prod-row p { font-size: 13.5px; color: var(--t3); }

/* ---------- FAQ ---------- */
.faq details { background: var(--panel); border: 1px solid var(--border); border-radius: 12px; margin-bottom: 14px; overflow: hidden; }
.faq summary { cursor: pointer; padding: 18px 24px; font-size: 15px; font-weight: 500; list-style: none; display: flex; justify-content: space-between; align-items: center; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: '+'; color: var(--cyan); font-size: 20px; font-weight: 400; transition: transform 0.2s; }
.faq details[open] summary::after { transform: rotate(45deg); }
.faq details .fa { padding: 0 24px 20px; font-size: 13.5px; color: var(--t3); line-height: 1.8; border-top: 1px dashed var(--border); padding-top: 14px; margin: 0 24px 20px; padding-left: 0; padding-right: 0; }

/* ---------- 金句带 ---------- */
.quote-band { background: linear-gradient(90deg, rgba(57,198,220,0.14), rgba(245,184,65,0.08)); border: 1px solid rgba(57,198,220,0.3); border-radius: var(--radius); padding: 26px 32px; font-size: 17px; letter-spacing: 1px; }
.quote-band b { color: var(--cyan); font-weight: 500; }
.quote-band .gold { color: var(--gold); font-weight: 500; }

/* ---------- 滚动显现 ---------- */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.7s ease, transform 0.7s ease; }
.reveal.in { opacity: 1; transform: none; }

/* ---------- 响应式 ---------- */
@media (max-width: 1080px) {
  .grid-5 { grid-template-columns: repeat(3, 1fr); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .eco-grid { grid-template-columns: repeat(2, 1fr); }
  .flow, .flow-5, .flow-6 { grid-template-columns: repeat(2, 1fr); }
  .step::after { display: none; }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .hero-inner { grid-template-columns: 1fr; gap: 20px; }
  .hero-visual { height: 380px; max-width: 560px; }
  .hero h1 { font-size: 42px; }
  .split { grid-template-columns: 1fr; gap: 28px; }
  .split.rev > .split-media { order: 0; }
  .prod-row { grid-template-columns: 1fr; text-align: center; gap: 20px; }
  .prod-row .pr-media { height: 160px; }
  .prod-row .spec-chips, .prod-row h3 { justify-content: center; }
  .cta-inner { flex-direction: column; text-align: center; gap: 28px; }
  .cta-inner p { margin-left: auto; margin-right: auto; }
  .hero-actions { justify-content: flex-start; }
}
@media (max-width: 760px) {
  .section { padding: 64px 0; }
  .nav-links, .nav-phone { display: none; }
  .nav-burger { display: block; }
  .nav.open .nav-links {
    display: flex; position: absolute; top: var(--nav-h); left: 0; right: 0; flex-direction: column;
    background: rgba(8, 26, 48, 0.98); border-bottom: 1px solid var(--border); padding: 12px 24px 20px; gap: 2px;
  }
  .grid-5, .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .grid-2, .flow, .flow-5, .flow-6, .eco-grid, .stats-inner { grid-template-columns: 1fr; }
  .stat { border-left: none; border-top: 1px solid var(--border); }
  .stat:first-child { border-top: none; }
  .hero h1 { font-size: 34px; letter-spacing: 2px; }
  .section-title { font-size: 26px; }
  .page-hero h1 { font-size: 30px; }
  .cta-band { padding: 36px 24px; }
  .hero-visual { height: 300px; }
}

/* ---------- SEO：页脚关键词内链 ---------- */
.footer-kw { border-top: 1px solid var(--border); padding: 18px 0 4px; display: flex; gap: 14px; align-items: flex-start; flex-wrap: wrap; }
.footer-kw .fk-label { font-size: 12.5px; color: var(--muted); letter-spacing: 1px; white-space: nowrap; padding-top: 2px; }
.footer-kw .fk-list { display: flex; flex-wrap: wrap; gap: 6px 16px; }
.footer-kw a { font-size: 12.5px; color: var(--t3); transition: color 0.2s; }
.footer-kw a:hover { color: var(--cyan); }
.footer-contact a { color: var(--t3); transition: color 0.2s; }
.footer-contact a:hover { color: var(--cyan); }

/* ---------- 页脚备案信息（版权行内居中一项） ---------- */
.footer-bottom .footer-beian { display: inline-flex; align-items: center; gap: 10px; }
.footer-bottom .footer-beian a { font-size: 12.5px; color: var(--muted); letter-spacing: 0.5px; transition: color 0.2s; }
.footer-bottom .footer-beian a:hover { color: var(--cyan); }