/* ==========================================================================
   NVIDIA GeForce 驱动专题站 · 共享设计系统
   复刻自 RTX 3090 成熟母版（nvidia-geforce.drivergenius.com）
   ========================================================================== */

:root {
  --ink: #101923;
  --muted: #627080;
  --line: #dce5ec;
  --soft: #f4f8fb;
  --blue: #2e75e8;
  --blue-dark: #1753ad;
  --cyan: #16b9c8;
  --lime: #b8f23d;
  --mint: #eaf8f0;
  --white: #fff;
  --dark: #101923;
  --dark-2: #182532;
  --shadow: 0 24px 70px rgba(32, 65, 92, .12);
  --radius: 18px;
  --wrap: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: #fff;
  font: 16px/1.72 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
button, input, select { font: inherit; }

.wrap { width: min(var(--wrap), calc(100% - 48px)); margin: 0 auto; }
.icon { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; flex: none; }

/* 无障碍跳转 */
.skip-link { position: fixed; left: 12px; top: -80px; z-index: 100; background: #fff; padding: 10px 14px; border-radius: 8px; box-shadow: var(--shadow); }
.skip-link:focus { top: 12px; }

/* 顶部导航 */
.site-header { position: sticky; top: 0; z-index: 50; height: 72px; background: rgba(255,255,255,.92); border-bottom: 1px solid rgba(220,229,236,.85); backdrop-filter: blur(18px); }
.header-inner { height: 100%; display: flex; align-items: center; gap: 28px; }
.brand { display: flex; align-items: center; gap: 13px; margin-right: auto; }
.brand img { width: 134px; height: 42px; object-fit: contain; }
.brand span { display: flex; flex-direction: column; line-height: 1.18; border-left: 1px solid var(--line); padding-left: 13px; }
.brand strong { font-size: 14px; }
.brand small { margin-top: 4px; color: var(--muted); font-size: 11px; }
.main-nav { display: flex; align-items: center; gap: 5px; }
.main-nav > a { padding: 10px 12px; border-radius: 9px; color: #405061; font-size: 14px; font-weight: 700; }
.main-nav > a:hover, .main-nav > a.active { color: var(--blue); background: #eef5ff; }
.main-nav .nav-cta { display: flex; gap: 7px; align-items: center; margin-left: 7px; background: var(--blue); color: #fff; }
.main-nav .nav-cta:hover { color: #fff; background: var(--blue-dark); }
.menu-button { display: none; width: 44px; height: 44px; place-items: center; border: 1px solid var(--line); border-radius: 12px; background: #fff; color: var(--ink); }

/* 面包屑 */
.breadcrumb { display: flex; align-items: center; gap: 7px; min-height: 48px; color: #718091; font-size: 13px; }
.breadcrumb .icon { width: 13px; }
.breadcrumb a:hover { color: var(--blue); }

/* 标题 */
h1, h2, h3, p { margin-top: 0; }
h1, h2, h3 { line-height: 1.18; letter-spacing: -.025em; }
h1 { font-size: clamp(42px, 5.2vw, 70px); margin-bottom: 24px; }
h2 { font-size: clamp(29px, 3.2vw, 43px); margin-bottom: 18px; }
h3 { font-size: 21px; }
.eyebrow { display: inline-flex; align-items: center; gap: 8px; margin-bottom: 18px; color: var(--blue); font-size: 12px; font-weight: 900; letter-spacing: .14em; text-transform: uppercase; }
.eyebrow:before { content: ""; width: 22px; height: 2px; background: currentColor; }

/* 按钮 */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 9px; min-height: 50px; padding: 0 21px; border: 1px solid transparent; border-radius: 12px; font-weight: 850; cursor: pointer; transition: .2s transform, .2s background, .2s border-color, .2s box-shadow; }
.btn:hover { transform: translateY(-2px); }
.btn-primary { background: linear-gradient(135deg, var(--blue), #4d8ff3); color: #fff; box-shadow: 0 12px 28px rgba(46,117,232,.24); }
.btn-primary:hover { box-shadow: 0 16px 36px rgba(46,117,232,.3); }
.btn-secondary { background: #fff; color: var(--ink); border-color: var(--line); }
.btn-secondary:hover { border-color: #9bb9da; }
.btn-light { background: #fff; color: var(--blue); }
.btn-ghost { background: transparent; color: #fff; border-color: rgba(255,255,255,.24); }
.hero-actions { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }

/* 首页首屏 */
.home-hero { position: relative; overflow: hidden; min-height: 600px; background: linear-gradient(135deg, #f4f8fb 0%, #eef9f4 48%, #e9f3ff 100%); }
.hero-mesh { position: absolute; inset: 0; background-image: linear-gradient(rgba(46,117,232,.055) 1px, transparent 1px), linear-gradient(90deg, rgba(46,117,232,.055) 1px, transparent 1px); background-size: 46px 46px; mask-image: linear-gradient(to right, #000, transparent 88%); }
.hero-mesh:after { content: ""; position: absolute; width: 520px; height: 520px; border-radius: 50%; right: -160px; top: -190px; background: radial-gradient(circle, rgba(184,242,61,.38), rgba(22,185,200,.08) 52%, transparent 70%); }
.home-grid { position: relative; display: grid; grid-template-columns: 1.04fr .96fr; align-items: center; gap: 58px; min-height: 600px; padding: 48px 0; }
.hero-copy p { max-width: 680px; margin-bottom: 30px; color: #536273; font-size: 19px; }
.trust-row { display: flex; gap: 20px; flex-wrap: wrap; margin-top: 26px; color: #647386; font-size: 13px; font-weight: 700; }
.trust-row span { display: flex; align-items: center; gap: 7px; }
.trust-row .icon { width: 17px; color: var(--blue); }

/* 显卡 CSS 可视化 */
.gpu-stage { position: relative; height: 460px; perspective: 1000px; }
.gpu-glow { position: absolute; width: 410px; height: 260px; left: 50%; top: 50%; transform: translate(-50%,-50%); background: radial-gradient(circle, rgba(46,117,232,.38), rgba(22,185,200,.18) 45%, transparent 70%); filter: blur(25px); }
.gpu-card { position: absolute; left: 50%; top: 50%; width: 440px; height: 215px; transform: translate(-50%,-50%) rotateY(-13deg) rotateX(4deg) rotateZ(-3deg); border: 2px solid #3b4a5c; border-radius: 26px; background: linear-gradient(145deg, #1c2834, #0c131b 62%, #202d38); box-shadow: 0 44px 80px rgba(15,32,49,.36), inset 0 0 0 4px rgba(255,255,255,.025); }
.gpu-card:before { content: ""; position: absolute; left: 35px; right: 35px; top: -9px; height: 10px; border-radius: 4px 4px 0 0; background: linear-gradient(90deg, #b8f23d, #16b9c8, #2e75e8); }
.gpu-edge { position: absolute; left: 24px; right: 24px; bottom: 16px; display: flex; justify-content: space-between; color: #eef8ff; font-size: 11px; font-weight: 900; letter-spacing: .22em; }
.gpu-edge b { font-size: 18px; letter-spacing: .03em; }
.fan { position: absolute; top: 37px; width: 130px; height: 130px; border-radius: 50%; border: 2px solid #405264; background: repeating-conic-gradient(from 4deg, #1f2d3a 0 8deg, #0d151d 9deg 23deg); box-shadow: inset 0 0 18px #000, 0 0 0 8px #111a23; }
.fan:before, .fan:after { content: ""; position: absolute; border-radius: 50%; inset: 24px; border: 1px solid #607387; }
.fan i { position: absolute; inset: 47px; border-radius: 50%; background: radial-gradient(circle, #b8f23d, #4f6b37 35%, #111 38%); }
.fan-one { left: 48px; }
.fan-two { right: 48px; }
.gpu-lines { position: absolute; inset: 18px; background: linear-gradient(115deg, transparent 20%, rgba(255,255,255,.05) 20% 21%, transparent 21% 77%, rgba(255,255,255,.05) 77% 78%, transparent 78%); pointer-events: none; }
.spec-float { position: absolute; z-index: 2; min-width: 132px; padding: 12px 14px; border: 1px solid rgba(255,255,255,.8); border-radius: 13px; background: rgba(255,255,255,.82); box-shadow: 0 20px 44px rgba(25,58,85,.14); backdrop-filter: blur(12px); }
.spec-float span { display: block; color: #758393; font-size: 11px; }
.spec-float strong { font-size: 14px; }
.spec-one { right: -8px; top: 42px; }
.spec-two { left: -12px; bottom: 56px; }
.spec-three { right: 28px; bottom: 20px; }

/* 路由卡带 */
.route-strip { position: relative; margin-top: -24px; z-index: 3; }
.route-strip .wrap { padding: 12px; border: 1px solid rgba(220,229,236,.9); border-radius: 22px; background: rgba(255,255,255,.92); box-shadow: 0 24px 55px rgba(32,65,92,.11); backdrop-filter: blur(14px); }
.link-cards { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.link-cards > a { position: relative; min-height: 145px; padding: 20px; border: 1px solid var(--line); border-radius: 15px; background: #fff; transition: .2s transform, .2s border-color, .2s box-shadow; }
.link-cards > a:hover { transform: translateY(-3px); border-color: #9ebde2; box-shadow: 0 16px 34px rgba(33,76,111,.1); }
.link-cards > a > strong, .link-cards > a > small { display: block; }
.link-cards > a > strong { margin: 15px 0 4px; font-size: 17px; }
.link-cards > a > small { padding-right: 22px; color: var(--muted); line-height: 1.5; }
.link-cards > a > .icon:last-child { position: absolute; right: 17px; bottom: 17px; width: 17px; color: var(--blue); }
.card-icon { display: grid; width: 38px; height: 38px; place-items: center; border-radius: 11px; background: #edf5ff; color: var(--blue); }

/* 通用区块 */
.section { padding: 92px 0; }
.section-soft { background: var(--soft); }
.section-dark { position: relative; overflow: hidden; background: linear-gradient(145deg, var(--dark), #17283a); color: #fff; }
.section-dark:after { content: ""; position: absolute; width: 440px; height: 440px; border: 1px solid rgba(184,242,61,.12); border-radius: 50%; right: -140px; top: -210px; box-shadow: 0 0 0 70px rgba(46,117,232,.035), 0 0 0 140px rgba(46,117,232,.02); }
.section-heading { max-width: 760px; margin: 0 auto 44px; text-align: center; }
.section-heading.left { margin-left: 0; text-align: left; }
.section-heading p { color: var(--muted); font-size: 17px; }
.section-heading.light p { color: #b6c4d2; }

/* 决策/工具卡 */
.decision-layout { display: grid; grid-template-columns: 1.08fr .92fr; gap: 48px; align-items: stretch; }
.decision-tool, .driver-matcher, .upgrade-tool, .size-checker, .price-tool, .brand-tool { padding: 24px; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; box-shadow: 0 20px 48px rgba(35,74,104,.08); }
label { display: flex; flex-direction: column; gap: 8px; color: #455467; font-size: 13px; font-weight: 800; }
select, input { width: 100%; height: 48px; padding: 0 13px; border: 1px solid #cfdbe5; border-radius: 10px; background: #fff; color: var(--ink); outline: none; }
select:focus, input:focus { border-color: var(--blue); box-shadow: 0 0 0 3px rgba(46,117,232,.11); }
.decision-tool { display: grid; grid-template-columns: 1fr 1fr; gap: 15px; }
.decision-tool label:nth-child(3) { grid-column: 1/-1; }
.decision-tool .btn { grid-column: 1/-1; }
.result-panel { position: relative; display: flex; flex-direction: column; justify-content: center; min-height: 360px; padding: 42px; border-radius: 24px; background: linear-gradient(145deg, #152333, #22384a); color: #fff; overflow: hidden; }
.result-panel:before { content: ""; position: absolute; width: 250px; height: 250px; right: -110px; top: -90px; border-radius: 50%; background: rgba(184,242,61,.14); }
.result-panel h3 { font-size: 29px; margin-bottom: 14px; }
.result-panel p { color: #b9c8d6; }
.result-kicker { color: var(--lime); font-size: 12px; font-weight: 900; letter-spacing: .15em; }
.result-meter { height: 7px; margin-top: 20px; border-radius: 99px; background: rgba(255,255,255,.1); overflow: hidden; }
.result-meter i { display: block; height: 100%; border-radius: inherit; background: linear-gradient(90deg, var(--cyan), var(--lime)); transition: .4s width; }
.metric-grid { position: relative; z-index: 2; display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.metric-grid article { padding: 28px 24px; border: 1px solid rgba(255,255,255,.1); border-radius: 16px; background: rgba(255,255,255,.045); }
.metric-grid span, .metric-grid small { display: block; color: #aebdcb; }
.metric-grid strong { display: block; margin: 8px 0; font-size: 34px; color: var(--lime); }
.center-actions { position: relative; z-index: 2; display: flex; justify-content: center; gap: 12px; margin-top: 32px; }

/* 对比展示 */
.split-showcase { display: grid; grid-template-columns: 1fr 1fr; gap: 65px; align-items: center; }
.split-showcase > div:last-child p { color: var(--muted); font-size: 17px; }
.comparison-visual { padding: 32px; border: 1px solid var(--line); border-radius: 23px; background: var(--soft); }
.bar-row { display: grid; grid-template-columns: 105px 1fr 60px; align-items: center; gap: 12px; margin: 18px 0; }
.bar-row span { font-weight: 800; }
.bar-row i { height: 12px; border-radius: 99px; background: linear-gradient(90deg, var(--blue), var(--cyan)); width: var(--bar); max-width: 100%; }
.bar-row b { text-align: right; font-size: 13px; }
.comparison-visual > small { display: block; margin-top: 20px; color: var(--muted); }

/* FAQ */
.faq-list { max-width: 880px; margin: auto; }
.faq-list details { border-bottom: 1px solid var(--line); }
.faq-list summary { display: flex; justify-content: space-between; gap: 20px; padding: 22px 0; font-size: 17px; font-weight: 850; cursor: pointer; list-style: none; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary span { color: var(--blue); font-size: 23px; }
.faq-list p { padding: 0 42px 22px 0; color: var(--muted); }

/* 落地页首屏 */
.page-lead { position: relative; overflow: hidden; background: linear-gradient(135deg, #eef6ff, #f1fbf6 58%, #fbfcfd); }
.lead-grid { display: grid; grid-template-columns: 1fr 360px; align-items: center; gap: 60px; min-height: 390px; padding: 58px 0; }
.lead-grid > div:first-child p { max-width: 760px; color: var(--muted); font-size: 18px; }
.lead-product-image { width: 100%; height: 260px; object-fit: cover; border: 1px solid rgba(220,229,236,.9); border-radius: 22px; box-shadow: 0 28px 60px rgba(19,47,70,.2); }
.lead-grid h1 { font-size: clamp(38px, 4.6vw, 58px); }
.lead-orbit { position: relative; height: 260px; }
.chip-core { position: absolute; left: 50%; top: 50%; display: flex; flex-direction: column; align-items: center; justify-content: center; width: 150px; height: 150px; border-radius: 38px; transform: translate(-50%,-50%) rotate(8deg); background: linear-gradient(145deg, #1a2937, #0b131b); color: #fff; box-shadow: 0 30px 60px rgba(19,47,70,.23); font-size: 43px; font-weight: 950; }
.chip-core:before { content: ""; position: absolute; inset: -8px; border: 2px dashed rgba(46,117,232,.4); border-radius: 44px; }
.chip-core small { font-size: 10px; letter-spacing: .15em; color: var(--lime); }
.orbit { position: absolute; left: 50%; top: 50%; border: 1px solid rgba(46,117,232,.24); border-radius: 50%; transform: translate(-50%,-50%); }
.orbit-a { width: 230px; height: 150px; transform: translate(-50%,-50%) rotate(23deg); }
.orbit-b { width: 285px; height: 205px; transform: translate(-50%,-50%) rotate(-21deg); }

/* 工具壳 */
.tool-shell { padding: 34px; border: 1px solid var(--line); border-radius: 24px; background: #f9fbfd; }
.form-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.driver-matcher .btn, .size-checker .btn, .price-tool .btn { margin-top: 20px; }
.matcher-result, .tool-result { margin-top: 20px; padding: 20px; border: 1px solid #bcd4ed; border-radius: 13px; background: #eef6ff; }
.matcher-result h3, .tool-result h3 { margin-bottom: 8px; }
.matcher-result p, .tool-result p { margin-bottom: 14px; color: #536273; }

/* 流程步骤 */
.process-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.process-grid article { padding: 30px; border: 1px solid var(--line); border-radius: 18px; }
.process-grid article > span { display: inline-grid; width: 42px; height: 42px; place-items: center; margin-bottom: 25px; border-radius: 11px; background: #edf5ff; color: var(--blue); font-weight: 900; }
.process-grid h2 { font-size: 24px; }
.process-grid p { color: var(--muted); }

/* 下载面板 */
.download-panel { position: relative; z-index: 2; display: flex; align-items: center; justify-content: space-between; gap: 40px; }
.download-panel h2 { margin-bottom: 10px; }
.download-panel p { max-width: 700px; margin-bottom: 0; color: #b8c7d4; }

.narrow { max-width: 880px; }
.check-list { display: grid; gap: 10px; padding: 0; list-style: none; }
.check-list li { display: flex; align-items: flex-start; gap: 10px; padding: 12px 14px; border-radius: 10px; background: #f7fafc; }
.check-list .icon { margin-top: 3px; color: var(--blue); }
.notice { display: flex; align-items: flex-start; gap: 13px; padding: 18px 20px; margin: 24px 0; border: 1px solid #c7dcef; border-radius: 13px; background: #f0f7ff; color: #405165; }
.notice .icon { margin-top: 2px; color: var(--blue); }
.notice p { margin: 0; }
.notice-safe { border-color: #bee5ce; background: #effaf3; }
.notice-safe .icon { color: #168b54; }

/* 驱动类型对比 */
.type-columns { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; margin-bottom: 30px; }
.type-card { padding: 34px; border: 1px solid var(--line); border-radius: 20px; }
.type-card > span { font-size: 12px; font-weight: 900; letter-spacing: .16em; }
.type-card.game { background: linear-gradient(145deg, #eef6ff, #fff); }
.type-card.game > span { color: var(--blue); }
.type-card.studio { background: linear-gradient(145deg, #effbf4, #fff); }
.type-card.studio > span { color: #148758; }
.type-card p, .type-card li { color: var(--muted); }

/* 表格 */
.table-wrap { overflow: auto; border: 1px solid var(--line); border-radius: 15px; background: #fff; }
table { width: 100%; border-collapse: collapse; min-width: 650px; }
th, td { padding: 16px 18px; text-align: left; border-bottom: 1px solid var(--line); }
th { background: #f3f7fa; color: #445365; font-size: 13px; }
td { color: #4d5d6e; }

/* 对比工具 */
.compare-tool { padding: 25px; border: 1px solid var(--line); border-radius: 18px; background: #fff; }
.compare-selects { display: grid; grid-template-columns: 1fr 70px 1fr; align-items: end; gap: 16px; }
.compare-selects > span { display: grid; width: 52px; height: 52px; place-items: center; justify-self: center; border-radius: 50%; background: var(--dark); color: var(--lime); font-weight: 950; }
.compare-output { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin-top: 22px; }
.compare-model { padding: 24px; border-radius: 16px; background: var(--soft); }
.compare-model h3 { margin-bottom: 18px; }
.compare-model dl { display: grid; gap: 10px; margin: 0; }
.compare-model dl div { display: flex; justify-content: space-between; gap: 18px; padding-bottom: 8px; border-bottom: 1px solid var(--line); }
.compare-model dt { color: var(--muted); }
.compare-model dd { margin: 0; font-weight: 850; }

/* 文章布局（教程/规格页） */
.article-layout { display: grid; grid-template-columns: minmax(0, 1fr) 280px; gap: 55px; align-items: start; }
.article-content > section { padding: 0 0 52px; margin-bottom: 52px; border-bottom: 1px solid var(--line); }
.article-content > section:last-child { border-bottom: 0; }
.article-content h2 { font-size: 32px; }
.article-content p { color: #4f5f70; }
.article-content .link-cards { grid-template-columns: repeat(3, 1fr); }
.article-content .link-cards > a { min-height: 160px; }
.side-nav { position: sticky; top: 100px; padding: 22px; border: 1px solid var(--line); border-radius: 15px; background: #fafcfd; }
.side-nav strong, .side-nav a { display: block; }
.side-nav strong { margin-bottom: 12px; }
.side-nav a { padding: 8px 0; color: #5f6e7d; font-size: 14px; }
.side-nav a:hover { color: var(--blue); }
.side-nav hr { border: 0; border-top: 1px solid var(--line); margin: 13px 0; }

.upgrade-tool, .brand-tool { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.upgrade-tool .btn, .brand-tool .btn { grid-column: 1/-1; }
.upgrade-tool .tool-result, .brand-tool .tool-result { grid-column: 1/-1; }

/* 编号步骤 */
.steps { padding: 0; counter-reset: step; list-style: none; }
.steps li { position: relative; padding: 17px 18px 17px 58px; margin: 9px 0; border: 1px solid var(--line); border-radius: 12px; background: #fff; }
.steps li:before { counter-increment: step; content: counter(step); position: absolute; left: 16px; top: 15px; display: grid; width: 28px; height: 28px; place-items: center; border-radius: 8px; background: var(--blue); color: #fff; font-weight: 850; }

/* 规格看板 */
.spec-dashboard { display: grid; grid-template-columns: 330px 1fr; gap: 22px; }
.spec-main { position: relative; display: flex; min-height: 360px; flex-direction: column; align-items: center; justify-content: center; border-radius: 24px; background: linear-gradient(145deg, #152333, #21384b); color: #fff; overflow: hidden; }
.spec-main > span { color: var(--lime); font-size: 12px; font-weight: 900; letter-spacing: .14em; }
.spec-main > strong { font-size: 64px; line-height: 1.15; }
.spec-main > small { color: #b5c3d0; }
.spec-ring { position: absolute; width: 300px; height: 300px; border: 1px solid rgba(255,255,255,.09); border-radius: 50%; }
.spec-ring:before, .spec-ring:after { content: ""; position: absolute; inset: 28px; border: 1px dashed rgba(184,242,61,.18); border-radius: 50%; }
.spec-ring:after { inset: 60px; }
.spec-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.spec-cards article { padding: 25px; border: 1px solid var(--line); border-radius: 18px; }
.spec-cards span, .spec-cards small { display: block; color: var(--muted); }
.spec-cards strong { display: block; margin: 9px 0; font-size: 25px; }

/* 特性网格 */
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 15px; }
.feature-grid article { padding: 25px; border: 1px solid var(--line); border-radius: 16px; }
.feature-grid article > span { display: inline-block; padding: 5px 9px; margin-bottom: 18px; border-radius: 7px; background: #eaf3ff; color: var(--blue); font-size: 12px; font-weight: 900; }

/* 购买路径 */
.buying-path { position: relative; display: grid; grid-template-columns: repeat(4, 1fr); gap: 25px; }
.path-line { position: absolute; left: 8%; right: 8%; top: 29px; height: 2px; background: linear-gradient(90deg, var(--blue), var(--cyan), var(--lime)); }
.buying-path article { position: relative; padding-top: 75px; }
.buying-path article > span { position: absolute; top: 0; left: 0; display: grid; width: 58px; height: 58px; place-items: center; border: 5px solid #fff; border-radius: 50%; background: var(--dark); color: var(--lime); font-weight: 900; box-shadow: 0 0 0 1px var(--line); }
.buying-path h2 { font-size: 22px; }
.buying-path p { color: var(--muted); }

/* 404 */
.not-found { display: grid; min-height: 650px; place-items: center; text-align: center; background: var(--soft); }
.not-found span { font-size: 110px; font-weight: 950; color: var(--blue); }
.not-found h1 { font-size: 45px; }
.not-found p { color: var(--muted); }
.not-found .hero-actions { justify-content: center; }

/* 页脚 */
.site-footer { padding: 65px 0 24px; background: #111c27; color: #c2ced8; }
.footer-grid { display: grid; grid-template-columns: 1.35fr repeat(4, minmax(0, 1fr)); gap: 32px; }
.footer-grid > div:not(.footer-brand) { display: flex; flex-direction: column; gap: 9px; }
.footer-grid strong { margin-bottom: 9px; color: #fff; }
.footer-grid a { font-size: 14px; color: #aab8c4; }
.footer-grid a:hover { color: #fff; }
.footer-brand img{width:134px;height:auto;max-height:55px;object-fit:contain;padding:0;border-radius:5px;background:#fff}
.footer-brand p { max-width: 360px; margin: 18px 0; color: #aab8c4; }
.footer-brand .btn { width: max-content; }
.footer-brand .btn-light { background: var(--blue); color: #fff; border-color: var(--blue); box-shadow: 0 10px 24px rgba(46,117,232,.24); }
.footer-brand .btn-light:hover { background: var(--blue-dark); border-color: var(--blue-dark); color: #fff; }
.footer-brand .btn-light { background: var(--blue); color: #fff; border-color: var(--blue); box-shadow: 0 10px 24px rgba(46,117,232,.24); }
.footer-brand .btn-light:hover { background: var(--blue-dark); border-color: var(--blue-dark); color: #fff; }
.footer-bottom { display: flex; justify-content: space-between; gap: 30px; padding-top: 24px; margin-top: 48px; border-top: 1px solid rgba(255,255,255,.1); color: #7f909e; font-size: 12px; }

/* 移动端固定下载栏 */
.mobile-download-bar { display: none; position: fixed; left: 0; right: 0; bottom: 0; z-index: 60; padding: 12px 16px calc(12px + env(safe-area-inset-bottom)); background: rgba(255,255,255,.96); border-top: 1px solid var(--line); backdrop-filter: blur(14px); }
.mobile-download-bar .btn { width: 100%; }

/* 响应式 */
@media (max-width: 1050px) {
  .lead-grid { grid-template-columns: 1fr 380px; gap: 40px; }
  .home-grid { grid-template-columns: 1fr; gap: 20px; }
  .gpu-stage { height: 380px; }
  .metric-grid { grid-template-columns: repeat(2, 1fr); }
  .split-showcase { grid-template-columns: 1fr; gap: 40px; }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .article-layout { grid-template-columns: 1fr; }
  .side-nav { position: static; }
  .spec-dashboard { grid-template-columns: 1fr; }
}
@media (max-width: 800px) {
  .main-nav { display: none; }
  .menu-button { display: grid; }
  .main-nav.open { display: flex; position: absolute; top: 72px; left: 0; right: 0; flex-direction: column; background: #fff; padding: 16px; border-bottom: 1px solid var(--line); }
  .lead-grid { grid-template-columns: 1fr; min-height: auto; }
  .lead-orbit, .gpu-stage { display: none; }
  .decision-layout { grid-template-columns: 1fr; }
  .process-grid, .feature-grid, .spec-cards, .buying-path, .link-cards, .type-columns, .compare-output { grid-template-columns: 1fr; }
  .metric-grid { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .form-grid { grid-template-columns: 1fr; }
  .mobile-download-bar { display: block; }
  body { padding-bottom: 70px; }
  h1 { font-size: 34px; }
}