:root{--ink:#17222b;--muted:#5d6a75;--line:#dce3e8;--soft:#f4f7f9;--green:#76b900;--blue:#1769c2;--dark:#07111f}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--ink);font:15px/1.72 "Microsoft YaHei",Arial,sans-serif;background:#fff}a{color:var(--blue);text-decoration:none}img{max-width:100%}.wrap{width:min(1180px,calc(100% - 40px));margin:auto}.site-header{position:sticky;top:0;z-index:30;background:rgba(255,255,255,.97);border-bottom:1px solid var(--line)}.header-inner{min-height:72px;display:flex;align-items:center;justify-content:space-between;gap:24px}.brand{display:flex;align-items:center;gap:13px;color:var(--ink)}.brand img{width:52px;height:36px;object-fit:contain}.brand strong{display:block;font-size:17px}.brand small{display:block;color:var(--muted)}nav{display:flex;gap:22px;align-items:center}nav a{color:#3d4a55;font-weight:700}.hero{background:#08120d;color:#fff}.hero-grid{min-height:470px;display:grid;grid-template-columns:minmax(0,1fr) 440px;gap:54px;align-items:center;padding:54px 0}.eyebrow{display:block;margin-bottom:12px;color:#76b900;font-size:12px;font-weight:900;text-transform:uppercase}.hero h1{margin:0 0 18px;font-size:clamp(34px,5vw,58px);line-height:1.12}.hero p{max-width:690px;color:#ced9d1;font-size:17px}.hero-media{position:relative;overflow:hidden;aspect-ratio:1200/630;border:1px solid #344338;border-radius:8px;background:#000}.hero-media img{width:100%;height:100%;object-fit:cover}.hero-badge{position:absolute;right:12px;bottom:12px;padding:7px 10px;background:rgba(0,0,0,.75);font-weight:800}.actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:26px}.btn{display:inline-flex;min-height:48px;align-items:center;justify-content:center;padding:11px 22px;border-radius:6px;font-weight:850}.btn-primary{background:var(--blue);color:#fff}.btn-secondary{border:1px solid #77857b;color:#fff}.meta-row{display:flex;gap:18px;flex-wrap:wrap;margin-top:20px;color:#aebbb2;font-size:13px}.section{padding:64px 0}.section:nth-child(odd){background:var(--soft)}.section-heading{max-width:800px;margin-bottom:28px}.section h2{margin:0;font-size:30px;line-height:1.3}.decision,.record-grid,.variant-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.decision article,.record-grid article,.variant-grid article{padding:24px;border:1px solid var(--line);border-top:4px solid var(--green);background:#fff}.decision b{color:var(--blue);font-size:13px}.decision h3,.variant-grid h3{margin:8px 0}.decision p,.record-grid p,.variant-grid p,.prose{color:var(--muted)}.split{display:grid;grid-template-columns:1.1fr .9fr;gap:30px}.callout,.warning{padding:24px;border-left:4px solid var(--green);background:#eef5e8}.warning{border-color:#d88b22;background:#fff7e8}.table-wrap{overflow-x:auto;border:1px solid var(--line)}table{width:100%;min-width:650px;border-collapse:collapse;background:#fff}th,td{padding:15px 18px;border-bottom:1px solid var(--line);text-align:left}th{background:#eaf0f3}.facts{display:grid;grid-template-columns:repeat(4,1fr);border:1px solid var(--line);background:#fff}.facts div{padding:18px;border-right:1px solid var(--line);border-bottom:1px solid var(--line)}.facts span,.compare-strip span,.record-grid span{display:block;color:var(--muted);font-size:12px}.facts strong{font-size:16px}.faq{display:grid;gap:10px}.faq details{padding:17px 20px;border:1px solid var(--line);background:#fff}.faq summary{cursor:pointer;font-weight:800}.faq p{color:var(--muted)}.compare-strip{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);border:1px solid var(--line)}.compare-strip div{padding:20px;background:#fff}.timeline{padding:0;list-style:none;border-left:3px solid var(--green)}.timeline li{display:grid;grid-template-columns:90px 1fr;gap:18px;padding:13px 20px}.boundary{display:grid;gap:12px}.boundary p,.checklist p{margin:0;padding:15px 18px;background:#fff;border:1px solid var(--line)}.intent-map{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.intent-map.four{grid-template-columns:repeat(4,1fr)}.intent-map a{padding:22px;border:1px solid var(--line);background:#fff}.intent-map b,.intent-map span{display:block}.intent-map span{margin-top:7px;color:var(--muted)}.checklist span{color:var(--green);font-weight:900}.mid-cta{padding:28px;background:#102035;color:#fff;display:flex;justify-content:space-between;align-items:center;gap:20px}.mid-cta p{margin:4px 0 0;color:#c7d2df}.source-note{font-size:13px;color:var(--muted)}.site-footer{padding:36px 0;background:#0e1a27;color:#b7c2cd}.footer-grid{display:flex;justify-content:space-between;gap:30px}.footer-links{display:flex;gap:18px;flex-wrap:wrap}.site-footer a,.legal a{color:#fff}.legal{padding:18px 20px;background:#07111f;color:#cbd5e1;text-align:center;font-size:12px}.legal p{margin:3px}.mobile-download{display:none}.menu{display:none}@media(max-width:800px){.hero-grid{grid-template-columns:1fr;gap:28px}.hero-media{width:100%}.decision,.record-grid,.variant-grid,.intent-map,.intent-map.four,.facts{grid-template-columns:1fr 1fr}.split{grid-template-columns:1fr}nav{display:none}.menu{display:block;border:0;background:none;font-size:24px}.mobile-download{position:fixed;z-index:40;left:12px;right:12px;bottom:10px;display:flex;min-height:50px;align-items:center;justify-content:center;border-radius:6px;background:var(--blue);color:#fff;font-weight:850;box-shadow:0 10px 30px #0005}body{padding-bottom:70px}}@media(max-width:520px){.wrap{width:min(100% - 28px,1180px)}.hero h1{font-size:34px}.hero-grid{padding:38px 0}.section{padding:48px 0}.section h2{font-size:25px}.decision,.record-grid,.variant-grid,.intent-map,.intent-map.four,.facts,.compare-strip{grid-template-columns:1fr}.mid-cta,.footer-grid{align-items:flex-start;flex-direction:column}.timeline li{grid-template-columns:1fr;gap:2px}}
/* === 视觉对齐 RTX 5090（2026-09-20）=== */
:root{--blue:#2e75e8;--blue-dark:#1753ad}
.hero{background:linear-gradient(135deg,#f4f8fb 0%,#eef9f4 48%,#e9f3ff 100%);color:#101923}
.hero h1{color:#101923}
.hero p{color:#536273}
.eyebrow{color:#2e75e8}
.hero-media{border:1px solid #dce5ec;background:#fff}
.hero-badge{background:rgba(16,25,35,.78)}
.btn{border-radius:12px}
.btn-secondary{border:1px solid #b9cad5;color:#101923}
.meta-row{color:#647386}
.site-footer{background:#101923}

/* === 页内跳转导航（2026-09-21）=== */
.header-inner nav{gap:12px}
main>section[id]{scroll-margin-top:88px}
nav a[title]{white-space:nowrap}
@media(max-width:900px){.header-inner nav{position:absolute;left:12px;right:12px;top:100%;display:none;flex-direction:column;align-items:stretch;gap:2px;padding:12px;border:1px solid var(--line);border-radius:14px;background:#fff;box-shadow:0 18px 40px rgba(20,40,60,.16)}.header-inner nav a{padding:12px 10px;border-radius:10px}.header-inner .menu{display:block;border:0;background:none;font-size:24px}}

/* 首屏下载内容说明（一行小字）*/
.hero .download-note{margin:9px 0 0;padding:0;border:0;border-radius:0;background:none;font-size:12px;line-height:1.5;color:#8b97a3}

/* === 正文/侧边栏双栏（2026-09-21）=== */
.page-with-sidebar{display:grid;grid-template-columns:minmax(0,1fr) 270px;gap:34px;align-items:start}
.page-main{min-width:0}
.page-with-sidebar .page-main>section>.wrap{width:100%;padding-right:0;padding-left:0;margin:0}
.page-with-sidebar .page-main>section>.wrap.mid-cta{padding:28px}
.page-sidebar{position:static;margin-top:60px}
.sidebar-card{padding:16px 18px 18px;margin-bottom:16px;border:1px solid #e6edf3;border-radius:10px;background:#fff;box-shadow:0 6px 18px rgba(20,40,60,.06)}
.sidebar-card:last-child{margin-bottom:0}
.sidebar-card h2{margin:0 0 10px;padding-left:9px;border-left:3px solid var(--blue);color:var(--ink);font-size:14px;line-height:1.35}
.sidebar-card ul{padding:0;margin:0;list-style:none}
.sidebar-card li{margin:0}
.sidebar-card a{position:relative;display:block;padding:7px 9px 7px 18px;border-radius:6px;color:var(--muted);font-size:13px;line-height:1.45}
.sidebar-card a:before{content:"";position:absolute;left:8px;top:50%;width:4px;height:4px;margin-top:-2px;border-radius:50%;background:#b9c7d4}
.sidebar-card a:hover,.sidebar-card a:focus-visible{color:var(--blue-dark);background:#edf5ff}
.sidebar-card a:hover:before,.sidebar-card a:focus-visible:before{background:var(--blue)}
@media(max-width:1000px){.page-with-sidebar{grid-template-columns:1fr}.page-sidebar{position:static;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;max-height:none;margin-top:0;padding:0 0 40px;overflow:visible}.sidebar-card{margin-bottom:0}}
@media(max-width:700px){.page-sidebar{grid-template-columns:1fr}}

/* === 首屏压缩（2026-09-21）=== */
.hero-grid{min-height:auto}
@media(min-width:801px){.hero-grid{padding:38px 0;gap:48px}.hero h1{font-size:clamp(30px,3.8vw,44px);margin-bottom:14px}.hero p{font-size:16px}}
@media(max-width:800px){.hero-grid{padding:26px 0;gap:20px}}

/* === 侧边栏排名序号（2026-09-21）=== */
.sidebar-card a.ranked{padding-left:10px}
.sidebar-card a.ranked:before{display:none}
.sidebar-rank{display:inline-flex;align-items:center;justify-content:center;width:18px;height:18px;margin-right:7px;border-radius:5px;color:#fff;font-size:11px;font-weight:800;line-height:1;vertical-align:1px}
.sidebar-card li:nth-child(1) .sidebar-rank{background:#e5484d}
.sidebar-card li:nth-child(2) .sidebar-rank{background:#f76b15}
.sidebar-card li:nth-child(3) .sidebar-rank{background:#16a34a}
.sidebar-card li:nth-child(n+4) .sidebar-rank{background:#eef2f6;color:#64748b}

/* === 首屏背景内缩（2026-09-21）=== */
.hero{background:none;padding:0 20px}
.hero-grid{width:min(1220px,100%);margin:0 auto;padding-left:20px;padding-right:20px;border-radius:16px;background:linear-gradient(135deg,#f4f8fb 0%,#eef9f4 48%,#e9f3ff 100%)}
@media(max-width:800px){.hero{padding:0 14px}.hero-grid{padding-left:14px;padding-right:14px;border-radius:14px}}

/* === 导航悬停高亮（2026-09-21）=== */
.header-inner nav a:not(.btn){padding:9px 12px;border-radius:9px;transition:color .15s ease,background-color .15s ease}
.header-inner nav a:not(.btn):hover,.header-inner nav a:not(.btn):focus-visible{color:var(--blue);background:#eef5ff}
.header-inner nav a[aria-current="page"]:not(.btn){color:var(--blue);background:#e6f1fc}

/* === 面包屑（2026-09-21）=== */
.breadcrumb{display:flex;align-items:center;gap:7px;min-height:48px;color:#718091;font-size:13px}
.breadcrumb .icon{width:13px;height:13px;flex:none;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.breadcrumb a{color:#718091}
.breadcrumb a:hover{color:var(--blue)}
.breadcrumb [aria-current]{color:var(--ink)}
@media(max-width:800px){.breadcrumb{min-height:40px}}

/* === 页脚竖排 + 链接配色（2026-09-21）=== */
.footer-links{flex-direction:column;gap:9px;align-items:flex-start}
.site-footer .footer-links a{color:#b7c2cd}
.site-footer .footer-links a:hover,.site-footer .footer-links a:focus-visible{color:#fff}

/* === 页脚紧凑排列（2026-09-21）=== */
.footer-grid{justify-content:flex-start;gap:30px 64px;flex-wrap:wrap}

/* === 步骤配图（2026-09-21）=== */
.step-figure{margin:14px 0 0;max-width:520px}
.step-figure img{display:block;width:100%;height:auto;border:1px solid var(--line);border-radius:10px;background:#fff}
.step-figure figcaption{margin-top:8px;color:var(--muted);font-size:12.5px;line-height:1.5}

/* === 驱动信息字段网格（2026-09-21）=== */
.fact-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 32px;margin:16px 0 0;border-top:1px solid var(--line)}
.fact-grid>div{display:flex;justify-content:space-between;gap:14px;padding:12px 0;border-bottom:1px solid var(--line)}
.fact-grid dt{color:var(--muted);font-size:13px;flex:none}
.fact-grid dd{margin:0;font-size:13px;font-weight:700;text-align:right}
@media(max-width:700px){.fact-grid{grid-template-columns:1fr}}

/* === 驱动信息去掉斑马纹底色（2026-09-21）=== */
#info{background:none}

/* === 补齐 .steps 安装步骤样式（对齐 gtx-1660-super）=== */
.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}
.driver-selection-guide .steps { margin: 0 0 24px; }
.driver-selection-guide .steps li { margin: 7px 0; padding-top: 13px; padding-bottom: 13px; background: var(--soft); }

/* === 补齐 .section-alt 交替背景 === */
.section-alt{background:var(--soft)}

/* === 补齐 .section-soft 交替底色（2026-09-22）=== */
.section-soft{background:var(--soft)}

/* === 分段底色交替（2026-09-23）===
   页面 4 个 section 的 nth-child 奇偶性为 1(#info) / 2(中段 CTA) / 3(#install) / 4(#faq)。
   #info 已有 background:none 保持白底；中段 CTA 与 #faq 显式带 section-soft 为灰底；
   若 #install 被 .section:nth-child(2n+1) 判为灰底，则第 2/3/4 节连成一整片灰、分段不可辨。
   这里让 #install 保持白底，得到「白 → 灰 → 白 → 灰」的清晰交替。 */
#install{background:none}

/* === 中段 CTA 紧贴上一节（2026-09-23 按需求）===
   去掉中段 CTA 所在 section 的上内边距，使深色卡直接贴合「驱动信息」下边界。
   选择器说明：中段 CTA 是 .page-main 下唯一「带 section-soft 但没有 id」的 section
   （#faq 也有 section-soft 但带 id，不会被命中）。 */
.page-with-sidebar .page-main>section.section-soft:not([id]){padding-top:0}