/* ============================================================
   驱动人生 qudongrensheng.top — 动力引擎舱
   主色 logo 蓝 #1080c0 / 深海军蓝 #0d2b42 / 冷灰白 #f5f8fb
   ============================================================ */
:root{
  --primary:#1080c0;
  --primary-2:#38a3dc;
  --primary-deep:#0a6a9e;
  --accent:#0ea5e9;
  --ink:#16283a;
  --ink-soft:#4a5f6e;
  --ink-faint:#8296a3;
  --bg:#f5f8fb;
  --card:#ffffff;
  --line:#dfe7ee;
  --dark:#0d2b42;
  --dark-2:#123a57;
  --ok:#16a34a;
  --warn:#d97706;
  --danger:#dc2626;
  --radius:16px;
  --radius-sm:10px;
  --shadow:0 10px 30px -12px rgba(13,43,66,.18);
  --shadow-sm:0 4px 14px -6px rgba(13,43,66,.14);
  --font:"Segoe UI","Microsoft YaHei","PingFang SC","Hiragino Sans GB",system-ui,sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:var(--font);color:var(--ink);background:var(--bg);line-height:1.75;font-size:16px;-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto;display:block}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3,h4{line-height:1.3;font-weight:700;color:var(--ink)}
.wrap{max-width:1160px;margin:0 auto;padding:0 20px}

/* ---------- 顶部导航 ---------- */
.nav{position:sticky;top:0;z-index:50;background:rgba(245,248,251,.92);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.nav-inner{max-width:1160px;margin:0 auto;padding:0 20px;height:68px;display:flex;align-items:center;gap:24px}
.logo{display:flex;align-items:center;gap:10px;color:var(--ink);font-weight:800;font-size:19px;letter-spacing:.5px;text-decoration:none}
.logo:hover{text-decoration:none}
.logo img{height:26px;width:auto;flex:0 0 auto}
.logo svg{flex:0 0 auto}
.logo b{color:var(--primary)}
.nav-links{display:flex;gap:6px;margin-left:auto;flex-wrap:wrap}
.nav-links a{color:var(--ink-soft);font-size:15px;padding:8px 12px;border-radius:8px;text-decoration:none;white-space:nowrap}
.nav-links a:hover{color:var(--ink);background:#e6eef5}
.nav-links a.on{color:var(--primary);font-weight:700;background:#e2eef8}
.nav-cta{background:linear-gradient(135deg,var(--primary-2),var(--primary));color:#fff;padding:9px 18px;border-radius:999px;font-weight:700;font-size:14px;text-decoration:none;white-space:nowrap;box-shadow:var(--shadow-sm)}
.nav-cta:hover{text-decoration:none;filter:brightness(1.05)}
.nav-toggle{display:none;margin-left:auto;background:none;border:none;cursor:pointer}
@media(max-width:920px){
  .nav-links{display:none;position:absolute;top:68px;left:0;right:0;background:var(--bg);flex-direction:column;padding:12px 20px;border-bottom:1px solid var(--line)}
  .nav-links.open{display:flex}
  .nav-toggle{display:block}
}

/* ---------- hero ---------- */
.hero{background:linear-gradient(180deg,var(--dark) 0%,var(--dark-2) 70%,#0e3a58 100%);color:#e8f2f8;overflow:hidden;position:relative}
.hero::after{content:"";position:absolute;left:0;right:0;bottom:0;height:4px;background:linear-gradient(90deg,var(--primary-2),var(--primary),var(--primary-deep))}
.hero-inner{max-width:1160px;margin:0 auto;padding:72px 20px 64px;display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center}
.hero-kicker{display:inline-flex;align-items:center;gap:8px;color:var(--primary-2);font-size:13px;font-weight:700;letter-spacing:2px;text-transform:uppercase}
.hero h1{color:#fff;font-size:clamp(30px,4.4vw,52px);line-height:1.15;margin:16px 0 18px}
.hero h1 em{font-style:normal;color:var(--primary-2)}
.hero-lead{color:#b8ccda;font-size:17px;max-width:520px;margin-bottom:28px}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap;align-items:center}
.btn{display:inline-flex;align-items:center;gap:8px;padding:13px 26px;border-radius:999px;font-weight:700;font-size:15px;text-decoration:none;border:1px solid transparent;cursor:pointer;transition:.15s}
.btn:hover{text-decoration:none;transform:translateY(-1px)}
.btn-primary{background:linear-gradient(135deg,var(--primary-2),var(--primary));color:#fff;box-shadow:0 8px 24px -8px rgba(16,128,192,.55)}
.btn-ghost{border-color:#3d5a73;color:#e8f2f8}
.btn-ghost:hover{border-color:var(--primary);color:var(--primary-2)}
.btn-outline{border-color:var(--primary);color:var(--primary-deep);background:transparent}
.btn-outline:hover{border-color:var(--primary-deep);background:#e2eef8}
.btn-accent{background:var(--accent);color:#fff}
.hero-meta{display:flex;gap:22px;margin-top:26px;flex-wrap:wrap;color:#8ca2b2;font-size:13px}
.hero-meta b{color:#dbe6ee;font-weight:700}
.meta-line{display:flex;gap:22px;margin-top:26px;flex-wrap:wrap;color:var(--ink-soft);font-size:13px}
.meta-line b{color:var(--ink);font-weight:700}
/* 驱动仪表盘 mockup */
.gauge{background:linear-gradient(160deg,#123651,#0d2b42);border:1px solid #2a4a63;border-radius:20px;padding:26px;box-shadow:0 24px 60px -24px rgba(0,0,0,.7)}
.gauge-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:18px}
.gauge-dot{width:10px;height:10px;border-radius:50%;background:var(--ok);box-shadow:0 0 0 4px rgba(22,163,74,.18)}
.gauge-title{font-size:14px;font-weight:700;color:#dbe6ee;letter-spacing:1px}
.gauge-body{display:flex;gap:22px;align-items:center}
.gauge-ring{position:relative;width:132px;height:132px;flex:0 0 auto}
.gauge-ring svg{transform:rotate(-90deg)}
.gauge-num{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center}
.gauge-num b{font-size:30px;color:#fff}
.gauge-num span{font-size:12px;color:var(--primary-2)}
.gauge-bars{flex:1;display:flex;flex-direction:column;gap:12px}
.gbar label{display:flex;justify-content:space-between;font-size:12px;color:#8ca2b2;margin-bottom:5px}
.gbar label b{color:#dbe6ee;font-weight:600}
.gbar-track{height:8px;background:#1d3d57;border-radius:99px;overflow:hidden}
.gbar-fill{height:100%;border-radius:99px;background:linear-gradient(90deg,var(--primary-2),var(--primary))}
.gbar-fill.blue{background:linear-gradient(90deg,#38bdf8,var(--accent))}
.gbar-fill.green{background:linear-gradient(90deg,#4ade80,var(--ok))}
.gbar-fill.warn{background:linear-gradient(90deg,#fbbf24,var(--warn))}
.gauge-tag{margin-top:18px;display:flex;gap:10px;flex-wrap:wrap}
.gtag{font-size:12px;padding:5px 12px;border-radius:99px;background:#1d3d57;color:#b8ccda;border:1px solid #2a4a63}
.gtag.on{color:var(--primary-2);border-color:var(--primary)}

/* ---------- 分区通用 ---------- */
.section{padding:64px 0}
.section.tint{background:#edf3f8}
.section.dark{background:var(--dark);color:#dbe6ee}
.section-head{max-width:680px;margin:0 auto 40px;text-align:center}
.kicker{display:inline-flex;align-items:center;gap:8px;color:var(--primary);font-size:13px;font-weight:800;letter-spacing:2px;text-transform:uppercase}
.kicker::before{content:"";width:22px;height:2px;background:var(--primary)}
.kicker::after{content:"";width:22px;height:2px;background:var(--primary)}
.section-title{font-size:clamp(24px,3vw,34px);margin:12px 0 12px}
.section-sub{color:var(--ink-soft);font-size:16px}

/* ---------- 下载一览 / 参数表 ---------- */
.specbar{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow-sm);padding:22px 26px;display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:18px;margin-top:-44px;position:relative;z-index:2}
.specbar .sp b{display:block;font-size:22px;color:var(--primary);margin-bottom:2px}
.specbar .sp span{font-size:13px;color:var(--ink-soft)}

/* ---------- bento 功能网格 ---------- */
.bento{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.bento-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:26px;box-shadow:var(--shadow-sm);transition:.18s}
.bento-card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.bento-card .ic{width:46px;height:46px;border-radius:12px;background:linear-gradient(135deg,var(--primary-2),var(--primary));display:flex;align-items:center;justify-content:center;color:#fff;margin-bottom:16px}
.bento-card h3{font-size:18px;margin-bottom:8px}
.bento-card p{font-size:14.5px;color:var(--ink-soft)}
@media(max-width:820px){.bento{grid-template-columns:1fr 1fr}}
@media(max-width:560px){.bento{grid-template-columns:1fr}}

/* ---------- 平台卡 ---------- */
.pcards{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.pcard{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-sm)}
.pcard-top{height:6px;background:linear-gradient(90deg,var(--primary-2),var(--primary),var(--primary-deep))}
.pcard-body{padding:24px}
.pcard h3{font-size:18px;margin-bottom:6px;display:flex;align-items:center;gap:8px}
.pcard .ver{font-size:12px;color:var(--ink-faint)}
.pcard p{font-size:14px;color:var(--ink-soft);margin:10px 0 16px;min-height:42px}
.pcard .btn{width:100%;justify-content:center;padding:11px 18px;font-size:14px}
@media(max-width:860px){.pcards{grid-template-columns:1fr 1fr}}
@media(max-width:560px){.pcards{grid-template-columns:1fr}}

/* ---------- 步骤时间线 ---------- */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;counter-reset:st}
.step{position:relative;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:24px 22px;box-shadow:var(--shadow-sm)}
.step::before{counter-increment:st;content:counter(st);position:absolute;top:-14px;left:22px;width:32px;height:32px;border-radius:50%;background:linear-gradient(135deg,var(--primary-2),var(--primary));color:#fff;font-weight:800;display:flex;align-items:center;justify-content:center;font-size:15px;box-shadow:var(--shadow-sm)}
.step h3{font-size:16px;margin:10px 0 6px}
.step p{font-size:14px;color:var(--ink-soft)}
@media(max-width:860px){.steps{grid-template-columns:1fr 1fr}}
@media(max-width:520px){.steps{grid-template-columns:1fr}}

/* ---------- 左右图文 split ---------- */
.split{display:grid;grid-template-columns:1fr 1fr;gap:44px;align-items:center}
.split.rev .split-media{order:2}
.split-copy h2{font-size:clamp(22px,3vw,30px);margin-bottom:14px}
.split-copy p{color:var(--ink-soft);margin-bottom:12px}
.split-copy ul{list-style:none;margin-top:8px}
.split-copy ul li{padding:7px 0 7px 28px;position:relative;color:var(--ink-soft);font-size:15px}
.split-copy ul li::before{content:"";position:absolute;left:0;top:14px;width:14px;height:14px;border-radius:4px;background:linear-gradient(135deg,var(--primary-2),var(--primary))}
.split-media img{border-radius:var(--radius);box-shadow:var(--shadow)}
.split-media .cap{font-size:12px;color:var(--ink-faint);margin-top:8px;text-align:center}
@media(max-width:820px){.split{grid-template-columns:1fr}.split.rev .split-media{order:0}}

/* ---------- 表格 ---------- */
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius);background:var(--card);box-shadow:var(--shadow-sm)}
table{width:100%;border-collapse:collapse;font-size:14.5px;min-width:520px}
th,td{padding:13px 16px;text-align:left;border-bottom:1px solid var(--line)}
th{background:#eef4f8;color:var(--ink);font-weight:700;white-space:nowrap}
td{color:var(--ink-soft)}
tr:last-child td{border-bottom:none}
td b{color:var(--ink)}

/* ---------- 提示框 ---------- */
.tip,.callout{border-radius:var(--radius-sm);padding:16px 18px;margin:18px 0;font-size:15px;display:flex;gap:12px;align-items:flex-start}
.tip{background:#eef6fd;border:1px solid #c3e0f2;color:#0a5a8a}
.callout{background:#eff6ff;border:1px solid #bfdbfe;color:#1e40af}
.tip::before{content:"⚙";font-weight:700}
.callout::before{content:"⚡";font-weight:700}

/* ---------- FAQ ---------- */
.faq{max-width:820px;margin:0 auto}
.faq-item{border:1px solid var(--line);border-radius:var(--radius-sm);margin-bottom:12px;background:var(--card);overflow:hidden}
.faq-q{width:100%;text-align:left;background:none;border:none;padding:18px 20px;font-size:16px;font-weight:700;color:var(--ink);cursor:pointer;display:flex;justify-content:space-between;align-items:center;gap:14px}
.faq-q::after{content:"+";font-size:22px;color:var(--primary);font-weight:700;transition:.2s;flex:0 0 auto}
.faq-item.open .faq-q::after{transform:rotate(45deg)}
.faq-a{display:none;padding:0 20px 18px;color:var(--ink-soft);font-size:15px}
.faq-item.open .faq-a{display:block}

/* ---------- 相关卡片 ---------- */
.rel{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.rel-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow-sm);text-decoration:none;color:var(--ink);transition:.18s;display:flex;flex-direction:column;gap:8px}
.rel-card:hover{text-decoration:none;transform:translateY(-3px);box-shadow:var(--shadow);border-color:var(--primary)}
.rel-card .tag{font-size:12px;color:var(--primary);font-weight:700}
.rel-card h4{font-size:16px;color:var(--ink)}
.rel-card p{font-size:13.5px;color:var(--ink-soft)}
@media(max-width:820px){.rel{grid-template-columns:1fr 1fr}}
@media(max-width:520px){.rel{grid-template-columns:1fr}}

/* ---------- 面包屑 ---------- */
.crumb{max-width:1160px;margin:0 auto;padding:20px 20px 0;font-size:13px;color:var(--ink-faint)}
.crumb a{color:var(--ink-soft)}
.crumb a:hover{color:var(--primary)}
.crumb span{color:var(--ink-faint)}

/* ---------- 文章双栏 ---------- */
.article-wrap{max-width:1160px;margin:0 auto;padding:0 20px 64px;display:grid;grid-template-columns:270px 1fr;gap:44px;align-items:start}
.toc{position:sticky;top:90px;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow-sm)}
.toc h4{font-size:14px;letter-spacing:1px;color:var(--ink-soft);margin-bottom:10px;text-transform:uppercase}
.toc a{display:block;font-size:13.5px;color:var(--ink-soft);padding:6px 0;border-left:2px solid var(--line);padding-left:12px;text-decoration:none}
.toc a:hover{color:var(--primary);border-color:var(--primary)}
.article{min-width:0}
.article-hero{background:linear-gradient(135deg,var(--dark),var(--dark-2));border-radius:var(--radius);padding:40px 36px;color:#e8f2f8;margin-bottom:28px}
.article-hero h1{color:#fff;font-size:clamp(24px,3.4vw,36px);line-height:1.25;margin:10px 0 12px}
.article-hero .ameta{color:#8ca2b2;font-size:13px;display:flex;gap:16px;flex-wrap:wrap}
.article-body h2{font-size:23px;margin:34px 0 14px;padding-top:12px}
.article-body h3{font-size:18px;margin:24px 0 10px}
.article-body p{margin-bottom:14px;color:#22303c}
.article-body ul,.article-body ol{margin:0 0 16px 22px}
.article-body li{margin-bottom:8px;color:#22303c}
.article-body img{border-radius:var(--radius);margin:20px 0}
.article-body table{margin:18px 0}
@media(max-width:900px){.article-wrap{grid-template-columns:1fr}.toc{position:static;margin-bottom:20px}}

/* ---------- 页脚 ---------- */
.footer{background:var(--dark);color:#8ca2b2;padding:56px 0 0;margin-top:40px}
.footer-grid{max-width:1160px;margin:0 auto;padding:0 20px;display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:32px}
.footer h4{color:#dbe6ee;font-size:15px;margin-bottom:14px}
.footer a{display:block;color:#8ca2b2;font-size:14px;padding:5px 0;text-decoration:none}
.footer a:hover{color:var(--primary-2)}
.footer .fbrand{font-size:18px;font-weight:800;color:#fff;margin-bottom:10px}
.footer .fbrand b{color:var(--primary-2)}
.footer p{font-size:13.5px}
.foot-bottom{border-top:1px solid #1d3d57;margin-top:40px;padding:18px 20px;text-align:center;font-size:13px;color:#4a5f6e}
@media(max-width:820px){.footer-grid{grid-template-columns:1fr 1fr}}

/* ---------- 返回顶部 ---------- */
.backtop{position:fixed;right:22px;bottom:22px;width:46px;height:46px;border-radius:50%;background:linear-gradient(135deg,var(--primary-2),var(--primary));color:#fff;border:none;cursor:pointer;display:none;align-items:center;justify-content:center;box-shadow:var(--shadow);z-index:40;font-size:20px}
.backtop.show{display:flex}

/* ---------- 杂项 ---------- */
.hero-visual img{width:100%}
.sitemap-links{columns:3;gap:30px}
.sitemap-links a{display:block;padding:6px 0;color:var(--ink-soft);font-size:14.5px;text-decoration:none}
.sitemap-links a:hover{color:var(--primary)}
@media(max-width:720px){.sitemap-links{columns:2}}
.pill{display:inline-block;padding:4px 12px;border-radius:99px;background:#e2eef8;color:var(--primary);font-size:12px;font-weight:700}
.mb0{margin-bottom:0}
.center{text-align:center}
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:18px}
@media(max-width:720px){.grid-2{grid-template-columns:1fr}}