/* roulang page: index */
:root{
  --brand-600:#1B5FE0;
  --brand-700:#1449B3;
  --brand-50:#EEF4FF;
  --brand-100:#D8E6FF;
  --accent:#17C3A2;
  --accent-warm:#FF8A3D;
  --ink-900:#0E1B2E;
  --ink-600:#4A5B73;
  --ink-400:#8A99AE;
  --line:#E3E9F2;
  --bg:#F5F8FD;
  --surface:#FFFFFF;
  --ok:#12A36B;
  --warn:#E8A400;
  --err:#D93B3B;
  --disabled:#C7D0DD;
  --r-card:16px;
  --r-lg:24px;
  --r-btn:12px;
  --r-chip:999px;
  --r-img:12px;
  --sh-sm:0 2px 8px rgba(16,42,86,.06);
  --sh-md:0 8px 24px rgba(16,42,86,.08);
  --sh-lg:0 16px 40px rgba(16,42,86,.10);
  --ease:cubic-bezier(.2,.7,.3,1);
  --dur:200ms;
  --container:1200px;
  --pad-x:32px;
  --sec-y:96px;
  --font-cn:"PingFang SC","HarmonyOS Sans","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;
}
*{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;font-family:var(--font-cn);font-size:16px;line-height:1.8;
  color:var(--ink-600);background:var(--bg);
  font-feature-settings:"tnum" 1;
}
h1,h2,h3,h4{margin:0;color:var(--ink-900);line-height:1.3;font-weight:700;}
p{margin:0 0 16px;}
a{color:var(--brand-600);text-decoration:none;transition:color var(--dur) var(--ease);}
a:hover{color:var(--brand-700);}
img{max-width:100%;display:block;}
button{font-family:inherit;}
ul,ol{margin:0;padding:0;list-style:none;}
:focus-visible{outline:2px solid var(--brand-600);outline-offset:2px;border-radius:6px;}
.container{max-width:var(--container);margin:0 auto;padding:0 var(--pad-x);}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;}
.section{padding:var(--sec-y) 0;}
.section--tight{padding:72px 0;}
.sec-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:40px;}
.sec-head h2{font-size:28px;letter-spacing:-.2px;}
.sec-head .sec-sub{margin-top:8px;font-size:14px;color:var(--ink-400);}
.link-more{font-size:14px;font-weight:600;display:inline-flex;align-items:center;gap:6px;white-space:nowrap;}
.link-more span{transition:transform var(--dur) var(--ease);}
.link-more:hover span{transform:translateX(4px);}

/* ============ 顶部信息条 ============ */
.topbar{height:36px;background:var(--brand-600);color:#fff;font-size:13px;}
.topbar .container{height:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;}
.topbar-left{display:flex;align-items:center;gap:10px;}
.version-chip{display:inline-flex;align-items:center;gap:6px;padding:2px 10px;border-radius:var(--r-chip);background:rgba(255,255,255,.16);font-size:12px;font-weight:600;letter-spacing:.2px;}
.version-chip i{width:6px;height:6px;border-radius:50%;background:var(--accent);display:block;}
.topbar-links{display:flex;align-items:center;gap:18px;}
.topbar-links a{color:rgba(255,255,255,.86);font-size:13px;}
.topbar-links a:hover{color:#fff;text-decoration:underline;text-underline-offset:3px;}

/* ============ 主导航 ============ */
.mainnav{position:sticky;top:0;z-index:60;background:var(--surface);border-bottom:1px solid var(--line);transition:box-shadow var(--dur) var(--ease);}
.mainnav.is-scrolled{box-shadow:var(--sh-md);}
.nav-inner{display:flex;align-items:center;gap:32px;height:68px;}
.logo{display:flex;align-items:center;gap:10px;flex:0 0 auto;color:var(--brand-600);font-weight:700;font-size:18px;letter-spacing:-.2px;}
.logo:hover{color:var(--brand-700);}
.logo-mark{width:34px;height:34px;flex:0 0 auto;}
.logo-text{white-space:nowrap;}
.nav-chips{display:flex;align-items:center;gap:4px;padding:4px;margin:0 auto;background:var(--brand-50);border-radius:var(--r-chip);overflow-x:auto;scrollbar-width:none;-webkit-overflow-scrolling:touch;}
.nav-chips::-webkit-scrollbar{display:none;}
.chip{display:inline-flex;align-items:center;flex:0 0 auto;padding:8px 18px;border-radius:var(--r-chip);font-size:14px;font-weight:500;color:var(--ink-600);white-space:nowrap;transition:background var(--dur) var(--ease),color var(--dur) var(--ease),box-shadow var(--dur) var(--ease);}
.chip:hover{background:rgba(255,255,255,.7);color:var(--brand-600);}
.chip.is-active{background:var(--surface);color:var(--brand-600);font-weight:600;box-shadow:var(--sh-sm);}
.chip.is-disabled{color:var(--disabled);pointer-events:none;}
.nav-actions{display:flex;align-items:center;gap:12px;flex:0 0 auto;}

/* ============ 按钮 ============ */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 22px;border-radius:var(--r-btn);border:1px solid transparent;font-size:15px;font-weight:600;cursor:pointer;text-decoration:none;line-height:1.2;transition:background var(--dur) var(--ease),color var(--dur) var(--ease),border-color var(--dur) var(--ease),box-shadow var(--dur) var(--ease),transform var(--dur) var(--ease);}
.btn svg{flex:0 0 auto;}
.btn-primary{background:var(--brand-600);color:#fff;box-shadow:0 4px 14px rgba(27,95,224,.22);}
.btn-primary:hover{background:var(--brand-700);color:#fff;transform:translateY(-2px);box-shadow:0 10px 24px rgba(27,95,224,.28);}
.btn-primary:active{transform:translateY(0);box-shadow:0 4px 12px rgba(27,95,224,.24);}
.btn-outline{background:var(--surface);border-color:var(--brand-100);color:var(--brand-600);}
.btn-outline:hover{background:var(--brand-50);color:var(--brand-700);border-color:var(--brand-600);}
.btn-ghost{background:transparent;border-color:var(--line);color:var(--ink-600);}
.btn-ghost:hover{background:var(--surface);border-color:var(--brand-100);color:var(--brand-600);box-shadow:var(--sh-sm);}
.btn-text{background:none;padding:6px 2px;color:var(--brand-600);border-radius:6px;}
.btn-text:hover{color:var(--brand-700);text-decoration:underline;text-underline-offset:4px;}
.btn-lg{padding:16px 30px;font-size:16px;border-radius:var(--r-chip);}
.btn-xl{padding:18px 40px;font-size:17px;border-radius:var(--r-chip);gap:12px;}
.btn[disabled],.btn.is-disabled{background:var(--disabled);color:#8A99AE;border-color:transparent;box-shadow:none;pointer-events:none;}
.btn-nav{padding:10px 18px;font-size:14px;}

/* ============ HERO ============ */
.hero{position:relative;overflow:hidden;padding:76px 0 96px;background:url(/assets/images/backpic/back-1.png) center/cover no-repeat;}
.hero::before{content:"";position:absolute;inset:0;background:linear-gradient(118deg,rgba(245,248,253,.94) 0%,rgba(238,244,255,.92) 52%,rgba(216,230,255,.86) 100%);}
.hero-pattern{position:absolute;inset:0;opacity:.06;pointer-events:none;}
.hero .container{position:relative;z-index:2;}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center;}
.hero-eyebrow{display:inline-flex;align-items:center;gap:8px;padding:6px 14px;border-radius:var(--r-chip);background:rgba(255,255,255,.8);border:1px solid var(--brand-100);color:var(--brand-600);font-size:13px;font-weight:600;margin-bottom:22px;}
.hero-eyebrow i{width:7px;height:7px;border-radius:50%;background:var(--accent);display:block;}
.hero h1{font-size:clamp(28px,5vw,44px);letter-spacing:-.6px;line-height:1.24;margin-bottom:18px;}
.hero h1 em{font-style:normal;color:var(--brand-600);}
.hero-sub{font-size:17px;line-height:1.85;color:var(--ink-600);max-width:520px;margin-bottom:28px;}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-bottom:26px;}
.trust-row{display:flex;flex-wrap:wrap;gap:10px;}
.badge{display:inline-flex;align-items:center;gap:6px;padding:6px 14px;border-radius:var(--r-chip);border:1px solid var(--brand-100);background:rgba(255,255,255,.72);font-size:13px;color:var(--ink-600);}
.badge i{width:6px;height:6px;border-radius:50%;background:var(--accent);display:block;}
.badge--solid{background:var(--brand-50);border-color:transparent;color:var(--brand-600);font-weight:600;}
.hero-visual{position:relative;padding-bottom:34px;}
.device{border-radius:20px;overflow:hidden;background:var(--surface);border:1px solid rgba(255,255,255,.9);box-shadow:var(--sh-lg);}
.device img{width:100%;aspect-ratio:16/9;object-fit:cover;}
.device-thumb{position:absolute;right:-10px;bottom:0;width:42%;border-radius:14px;overflow:hidden;background:var(--surface);border:1px solid var(--line);box-shadow:var(--sh-lg);transform:rotate(-2deg);}
.device-thumb img{width:100%;aspect-ratio:16/10;object-fit:cover;}

/* ============ 价值条带 ============ */
.value-strip{display:grid;grid-template-columns:repeat(3,1fr);gap:0;background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);box-shadow:var(--sh-sm);overflow:hidden;}
.value-item{padding:34px 30px 38px;position:relative;}
.value-item + .value-item{border-left:1px solid var(--line);}
.value-num{font-family:var(--font-mono);font-size:38px;font-weight:700;color:var(--brand-100);line-height:1;letter-spacing:-1px;margin-bottom:16px;}
.value-item:nth-child(2) .value-num{color:#C9F0E8;}
.value-item:nth-child(3) .value-num{color:#FFE0CB;}
.value-item h3{font-size:19px;margin-bottom:10px;}
.value-item p{margin:0;font-size:14.5px;line-height:1.85;color:var(--ink-600);}
.value-item:nth-child(1){padding-top:34px;}
.value-item:nth-child(2){padding-top:52px;}
.value-item:nth-child(3){padding-top:42px;}

/* ============ 轮播 ============ */
.carousel{position:relative;}
.carousel-viewport{overflow:hidden;border-radius:var(--r-lg);}
.slides{display:flex;transition:transform 480ms var(--ease);}
.slide{flex:0 0 84%;margin:0 8%;}
.slide-frame{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);overflow:hidden;box-shadow:var(--sh-md);}
.slide-frame img{width:100%;aspect-ratio:16/9;object-fit:cover;}
.slide-cap{padding:18px 22px;font-size:15px;color:var(--ink-600);display:flex;align-items:center;gap:10px;}
.slide-cap b{color:var(--ink-900);font-weight:600;}
.carousel-nav{display:flex;align-items:center;justify-content:center;gap:18px;margin-top:26px;}
.carousel-btn{width:42px;height:42px;border-radius:50%;border:1px solid var(--line);background:var(--surface);color:var(--ink-600);display:inline-flex;align-items:center;justify-content:center;cursor:pointer;transition:all var(--dur) var(--ease);}
.carousel-btn:hover{border-color:var(--brand-600);color:var(--brand-600);box-shadow:var(--sh-sm);}
.dots{display:flex;align-items:center;gap:8px;}
.dot{width:8px;height:8px;border-radius:50%;border:0;padding:0;background:var(--brand-100);cursor:pointer;transition:all var(--dur) var(--ease);}
.dot.is-active{width:24px;border-radius:var(--r-chip);background:var(--brand-600);}
.thumbs{display:flex;gap:12px;margin-top:22px;overflow-x:auto;padding-bottom:4px;scrollbar-width:none;}
.thumbs::-webkit-scrollbar{display:none;}
.thumb{flex:0 0 auto;width:132px;border-radius:var(--r-img);overflow:hidden;border:2px solid transparent;background:var(--surface);cursor:pointer;padding:0;transition:border-color var(--dur) var(--ease);}
.thumb img{width:100%;aspect-ratio:16/10;object-fit:cover;}
.thumb.is-active{border-color:var(--brand-600);}

/* ============ 系统要求 ============ */
.spec-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;}
.spec-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-card);padding:24px 26px;box-shadow:var(--sh-sm);}
.spec-card h3{font-size:17px;display:flex;align-items:center;gap:10px;margin-bottom:6px;}
.spec-card h3 span{width:28px;height:28px;border-radius:9px;background:var(--brand-50);color:var(--brand-600);display:inline-flex;align-items:center;justify-content:center;font-size:12px;font-weight:700;}
.spec-card .spec-note{font-size:13px;color:var(--ink-400);margin-bottom:10px;}
.spec-list{margin:0;}
.spec-row{display:flex;align-items:baseline;justify-content:space-between;gap:16px;padding:11px 12px;border-radius:8px;border-top:1px solid var(--line);font-size:14.5px;transition:background var(--dur) var(--ease);}
.spec-row:first-child{border-top:0;}
.spec-row:hover{background:var(--bg);}
.spec-row dt{color:var(--ink-600);}
.spec-row dd{margin:0;font-family:var(--font-mono);font-variant-numeric:tabular-nums;color:var(--ink-900);font-weight:600;font-size:14px;text-align:right;}

/* ============ 评价墙 ============ */
.review-wall{column-count:3;column-gap:24px;}
.review{break-inside:avoid;margin:0 0 24px;background:var(--surface);border:1px solid var(--line);border-radius:var(--r-card);padding:24px;box-shadow:var(--sh-sm);transition:transform var(--dur) var(--ease),box-shadow var(--dur) var(--ease);}
.review:hover{transform:translateY(-2px);box-shadow:var(--sh-md);}
.review-head{display:flex;align-items:center;gap:12px;margin-bottom:14px;}
.avatar{width:40px;height:40px;border-radius:50%;background:var(--brand-50);color:var(--brand-600);display:flex;align-items:center;justify-content:center;font-weight:700;font-size:15px;flex:0 0 auto;}
.review-name{font-size:15px;font-weight:600;color:var(--ink-900);line-height:1.4;}
.review-meta{font-size:12px;color:var(--ink-400);}
.stars{color:var(--accent-warm);letter-spacing:2px;font-size:13px;margin-bottom:10px;display:block;}
.review p{margin:0 0 12px;font-size:14.5px;line-height:1.85;color:var(--ink-600);}
.review-foot{display:flex;align-items:center;justify-content:space-between;gap:12px;font-size:12px;color:var(--ink-400);}
.tag{display:inline-flex;align-items:center;padding:3px 10px;border-radius:var(--r-chip);background:var(--brand-50);color:var(--brand-600);font-size:12px;font-weight:600;}
.tag--accent{background:#E4F8F3;color:#0F8E76;}
.tag--outline{background:transparent;border:1px solid var(--brand-100);color:var(--brand-600);}

/* ============ 下载区 ============ */
.download-box{background:var(--brand-50);border-radius:var(--r-lg);padding:56px 40px;display:grid;grid-template-columns:1fr auto;gap:44px;align-items:center;border:1px solid var(--brand-100);}
.download-main{text-align:left;}
.download-main h2{font-size:28px;margin-bottom:12px;}
.download-main p{font-size:15px;max-width:560px;}
.download-primary{display:inline-flex;flex-direction:column;align-items:flex-start;gap:2px;padding:14px 34px;border-radius:var(--r-chip);background:var(--brand-600);color:#fff;font-weight:700;font-size:17px;box-shadow:0 10px 26px rgba(27,95,224,.26);transition:all var(--dur) var(--ease);margin-top:8px;}
.download-primary:hover{background:var(--brand-700);color:#fff;transform:translateY(-2px);box-shadow:0 14px 32px rgba(27,95,224,.3);}
.download-primary small{font-size:12px;font-weight:500;opacity:.86;font-family:var(--font-mono);}
.download-alts{display:flex;flex-wrap:wrap;gap:12px;margin-top:18px;}
.alt-btn{display:inline-flex;align-items:center;gap:8px;padding:9px 18px;border-radius:var(--r-chip);border:1px solid var(--brand-100);background:rgba(255,255,255,.7);color:var(--brand-600);font-size:13.5px;font-weight:600;transition:all var(--dur) var(--ease);}
.alt-btn:hover{background:#fff;border-color:var(--brand-600);transform:translateY(-1px);}
.checksum{display:flex;flex-wrap:wrap;gap:18px;margin-top:22px;font-family:var(--font-mono);font-size:12px;color:var(--ink-400);}
.checksum b{color:var(--ink-600);font-weight:600;}
.qr-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-card);padding:20px;text-align:center;box-shadow:var(--sh-sm);width:200px;}
.qr{width:150px;height:150px;margin:0 auto 12px;border-radius:10px;background-color:#0E1B2E;
  background-image:
    linear-gradient(90deg,#0E1B2E 8px,transparent 8px),
    linear-gradient(#0E1B2E 8px,transparent 8px),
    repeating-conic-gradient(#0E1B2E 0 25%,transparent 0 50%);
  background-size:24px 24px,24px 24px,16px 16px;background-position:0 0,0 0,6px 6px;border:8px solid #fff;box-shadow:0 0 0 1px var(--line);}
.qr-card span{font-size:13px;color:var(--ink-400);}

/* ============ 最新信息 ============ */
.feat-card{display:grid;grid-template-columns:1.05fr 1fr;gap:0;background:var(--surface);border:1px solid var(--line);border-radius:var(--r-card);overflow:hidden;box-shadow:var(--sh-sm);transition:transform var(--dur) var(--ease),box-shadow var(--dur) var(--ease);margin-bottom:20px;}
.feat-card:hover{transform:translateY(-2px);box-shadow:var(--sh-md);}
.feat-media{position:relative;min-height:260px;background:var(--brand-50);}
.feat-media img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;}
.feat-body{padding:30px 32px;display:flex;flex-direction:column;justify-content:center;}
.feat-body h3{font-size:22px;margin:14px 0 12px;line-height:1.45;}
.feat-body h3 a{color:var(--ink-900);}
.feat-card:hover .feat-body h3 a{color:var(--brand-600);}
.feat-body p{margin:0 0 18px;font-size:15px;line-height:1.85;color:var(--ink-600);}
.feat-meta{display:flex;align-items:center;gap:14px;font-size:13px;color:var(--ink-400);}
.post-list{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-card);overflow:hidden;}
.post-item{display:flex;align-items:center;gap:20px;padding:20px 26px;border-top:1px solid var(--line);transition:background var(--dur) var(--ease);}
.post-item:first-child{border-top:0;}
.post-item:hover{background:var(--bg);}
.post-main{flex:1 1 auto;min-width:0;}
.post-main h4{font-size:16px;font-weight:600;margin-bottom:6px;line-height:1.5;}
.post-item:hover .post-main h4 a{color:var(--brand-600);}
.post-main h4 a{color:var(--ink-900);}
.post-main p{margin:0;font-size:13.5px;color:var(--ink-400);overflow:hidden;display:-webkit-box;-webkit-line-clamp:1;-webkit-box-orient:vertical;}
.post-side{display:flex;align-items:center;gap:14px;flex:0 0 auto;font-size:12.5px;color:var(--ink-400);}
.post-date{font-family:var(--font-mono);font-variant-numeric:tabular-nums;}
.post-arrow{color:var(--brand-100);transition:transform var(--dur) var(--ease),color var(--dur) var(--ease);}
.post-item:hover .post-arrow{color:var(--brand-600);transform:translateX(4px);}
.empty-state{padding:64px 24px;text-align:center;background:var(--surface);border:1px dashed var(--line);border-radius:var(--r-card);}
.empty-state svg{margin:0 auto 16px;color:var(--brand-100);}
.empty-state p{margin:0 0 12px;color:var(--ink-400);font-size:15px;}

/* ============ FAQ ============ */
.faq-list{display:grid;gap:14px;}
.faq-item{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-card);overflow:hidden;transition:box-shadow var(--dur) var(--ease);}
.faq-item[open]{box-shadow:var(--sh-md);border-color:var(--brand-100);}
.faq-item summary{list-style:none;cursor:pointer;padding:22px 26px 22px 30px;display:flex;align-items:center;justify-content:space-between;gap:20px;font-size:16.5px;font-weight:600;color:var(--ink-900);position:relative;transition:color var(--dur) var(--ease);}
.faq-item summary::-webkit-details-marker{display:none;}
.faq-item summary::before{content:"";position:absolute;left:0;top:14px;bottom:14px;width:3px;border-radius:0 3px 3px 0;background:transparent;transition:background var(--dur) var(--ease);}
.faq-item[open] summary::before{background:var(--brand-600);}
.faq-item summary:hover{color:var(--brand-600);}
.faq-icon{width:26px;height:26px;flex:0 0 auto;border-radius:50%;border:1px solid var(--line);display:inline-flex;align-items:center;justify-content:center;color:var(--brand-600);font-size:16px;line-height:1;transition:transform var(--dur) var(--ease),background var(--dur) var(--ease);}
.faq-item[open] .faq-icon{background:var(--brand-50);transform:rotate(45deg);}
.faq-body{padding:0 30px 24px;font-size:15px;line-height:1.9;color:var(--ink-600);}
.faq-body p{margin:0;}

/* ============ 页脚 CTA ============ */
.footer-cta{background:linear-gradient(100deg,var(--brand-600),#2C74F0);color:#fff;}
.footer-cta .container{padding-top:44px;padding-bottom:44px;display:flex;align-items:center;justify-content:space-between;gap:28px;flex-wrap:wrap;}
.footer-cta h2{color:#fff;font-size:23px;margin-bottom:6px;}
.footer-cta p{color:rgba(255,255,255,.85);font-size:14.5px;margin:0;}
.footer-cta .btn{background:#fff;color:var(--brand-600);box-shadow:0 10px 26px rgba(11,40,90,.2);}
.footer-cta .btn:hover{background:var(--brand-50);color:var(--brand-700);}

/* ============ 页脚 ============ */
.site-footer{background:var(--surface);border-top:1px solid var(--line);padding:64px 0 0;}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:40px;padding-bottom:48px;}
.footer-brand .logo{margin-bottom:16px;}
.footer-brand p{font-size:14px;line-height:1.85;max-width:320px;color:var(--ink-600);}
.footer-col h4{font-size:15px;margin-bottom:16px;color:var(--ink-900);}
.footer-col li{margin-bottom:11px;}
.footer-col a{font-size:14px;color:var(--ink-600);}
.footer-col a:hover{color:var(--brand-600);}
.footer-version{font-size:13px;color:var(--ink-400);line-height:1.9;}
.footer-version b{display:block;color:var(--ink-900);font-weight:600;margin-bottom:6px;font-size:14px;}
.footer-bottom{border-top:1px solid var(--line);padding:22px 0 30px;display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;font-size:13px;color:var(--ink-400);}
.footer-bottom .mono{color:var(--ink-400);}

/* ============ 返回顶部 ============ */
#toTop{position:fixed;right:26px;bottom:26px;width:46px;height:46px;border-radius:50%;border:1px solid var(--line);background:var(--surface);color:var(--brand-600);display:flex;align-items:center;justify-content:center;cursor:pointer;box-shadow:var(--sh-md);opacity:0;visibility:hidden;transform:translateY(10px);transition:all var(--dur) var(--ease);z-index:80;}
#toTop.is-visible{opacity:1;visibility:visible;transform:translateY(0);}
#toTop:hover{background:var(--brand-600);color:#fff;border-color:var(--brand-600);}

/* ============ 响应式 ============ */
@media (max-width:1279px){
  :root{--pad-x:28px;}
  .hero-grid{gap:40px;}
}
@media (max-width:1023px){
  :root{--pad-x:24px;--sec-y:72px;}
  .nav-inner{flex-wrap:wrap;height:auto;padding:12px 0;gap:12px;}
  .nav-chips{order:3;width:100%;margin:0;padding:4px;-webkit-overflow-scrolling:touch;}
  .nav-actions{margin-left:auto;}
  .hero{padding:56px 0 72px;}
  .hero-grid{grid-template-columns:1fr;gap:44px;}
  .hero-sub{max-width:none;}
  .value-strip{grid-template-columns:1fr;}
  .value-item + .value-item{border-left:0;border-top:1px solid var(--line);}
  .value-item,.value-item:nth-child(2),.value-item:nth-child(3){padding:28px 26px 32px;}
  .review-wall{column-count:2;}
  .download-box{grid-template-columns:1fr;padding:40px 28px;gap:32px;}
  .qr-card{width:100%;}
  .feat-card{grid-template-columns:1fr;}
  .feat-media{min-height:200px;}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px;}
}
@media (max-width:767px){
  :root{--pad-x:20px;--sec-y:56px;}
  body{font-size:15.5px;}
  .topbar-links{display:none;}
  .sec-head{flex-direction:column;align-items:flex-start;gap:12px;margin-bottom:28px;}
  .sec-head h2{font-size:23px;}
  .hero h1{letter-spacing:-.3px;}
  .hero-actions .btn{width:100%;}
  .spec-grid{grid-template-columns:1fr;}
  .review-wall{column-count:1;}
  .slide{flex:0 0 92%;margin:0 4%;}
  .post-item{flex-direction:column;align-items:flex-start;gap:10px;}
  .post-side{width:100%;justify-content:space-between;}
  .footer-cta .container{flex-direction:column;align-items:flex-start;}
  .footer-cta .btn{width:100%;}
  .footer-grid{grid-template-columns:1fr;gap:28px;}
  .download-main h2{font-size:23px;}
  .faq-item summary{padding:18px 18px 18px 22px;font-size:15.5px;}
  .faq-body{padding:0 22px 20px;}
}
@media (max-width:400px){
  :root{--pad-x:16px;}
  .logo{font-size:16px;}
  .btn-nav{padding:9px 14px;font-size:13px;}
  .download-box{padding:32px 20px;}
}
@media (prefers-reduced-motion:reduce){
  *{transition:none !important;animation:none !important;scroll-behavior:auto !important;}
}

/* roulang page: article */
:root{
  --brand-600:#1B5FE0;
  --brand-700:#1449B3;
  --brand-50:#EEF4FF;
  --brand-100:#D8E6FF;
  --accent:#17C3A2;
  --accent-warm:#FF8A3D;
  --ink-900:#0E1B2E;
  --ink-600:#4A5B73;
  --ink-400:#8A99AE;
  --line:#E3E9F2;
  --bg:#F5F8FD;
  --surface:#FFFFFF;
  --ok:#12A36B;
  --warn:#E8A400;
  --err:#D93B3B;
  --disabled:#C7D0DD;
  --radius-sm:8px;
  --radius:12px;
  --radius-card:16px;
  --radius-lg:24px;
  --radius-pill:999px;
  --shadow-sm:0 2px 8px rgba(16,42,86,.06);
  --shadow-md:0 8px 24px rgba(16,42,86,.08);
  --shadow-lg:0 16px 40px rgba(16,42,86,.10);
  --shadow-brand:0 10px 24px rgba(27,95,224,.28);
  --ease:cubic-bezier(.2,.7,.3,1);
  --dur:200ms;
  --gap:24px;
  --sec-y:96px;
  --font-sans:"PingFang SC","HarmonyOS Sans","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.75;
  color:var(--ink-600);
  background:var(--bg);
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;border:0}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
h1,h2,h3,h4,p,ul,ol,figure{margin:0}
ul,ol{padding:0;list-style:none}
:focus-visible{outline:2px solid var(--brand-600);outline-offset:2px;border-radius:6px}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.container{width:100%;max-width:1200px;margin:0 auto;padding:0 32px}
.section{padding:var(--sec-y) 0}
.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:32px}
.section-title{font-size:28px;font-weight:700;color:var(--ink-900);line-height:1.3}
.section-sub{margin-top:8px;font-size:14px;color:var(--ink-400)}
.link-more{font-size:14px;font-weight:600;color:var(--brand-600);display:inline-flex;align-items:center;gap:6px}
.link-more svg{transition:transform var(--dur) var(--ease)}
.link-more:hover svg{transform:translateX(4px)}

/* ============ 顶部信息条 ============ */
.topbar{background:var(--brand-600);color:#fff;font-size:12px;height:36px;display:flex;align-items:center}
.topbar-inner{display:flex;align-items:center;justify-content:space-between;gap:16px}
.ver-chip{display:inline-flex;align-items:center;gap:6px;background:rgba(255,255,255,.16);border:1px solid rgba(255,255,255,.28);padding:2px 10px;border-radius:var(--radius-pill);font-family:var(--font-mono)}
.ver-chip .dot{width:6px;height:6px;border-radius:50%;background:var(--accent)}
.topbar-links{display:flex;align-items:center;gap:18px}
.topbar-links a{color:rgba(255,255,255,.86)}
.topbar-links a:hover{color:#fff;text-decoration:underline;text-underline-offset:3px}

/* ============ 主导航 ============ */
.mainnav{position:sticky;top:0;z-index:60;background:var(--surface);border-bottom:1px solid var(--line);transition:box-shadow var(--dur) var(--ease)}
.mainnav.is-scrolled{box-shadow:var(--shadow-md)}
.nav-inner{display:flex;align-items:center;gap:28px;min-height:68px}
.logo{display:inline-flex;align-items:center;gap:10px;flex:0 0 auto}
.logo-mark{width:34px;height:34px}
.logo-text{font-size:19px;font-weight:700;color:var(--brand-600);letter-spacing:.2px;white-space:nowrap}
.nav-chips{display:flex;align-items:center;gap:4px;background:var(--brand-50);padding:4px;border-radius:var(--radius-pill);margin:0 auto}
.chip{display:inline-flex;align-items:center;white-space:nowrap;padding:8px 16px;border-radius:var(--radius-pill);font-size:14px;font-weight:500;color:var(--ink-600);background:transparent;transition:background var(--dur) var(--ease),color var(--dur) var(--ease),box-shadow var(--dur) var(--ease)}
.chip:hover{background:rgba(255,255,255,.7);color:var(--brand-600)}
.chip.is-active{background:var(--surface);color:var(--brand-600);font-weight:600;box-shadow:var(--shadow-sm)}
.chip.is-disabled{color:var(--disabled);pointer-events:none}
.nav-actions{display:flex;align-items:center;gap:10px;flex:0 0 auto;margin-left:8px}

/* ============ 按钮 ============ */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:11px 20px;border-radius:var(--radius);border:1px solid transparent;font-size:14px;font-weight:600;cursor:pointer;transition:transform var(--dur) var(--ease),box-shadow var(--dur) var(--ease),background var(--dur) var(--ease),color var(--dur) var(--ease),border-color var(--dur) var(--ease);white-space:nowrap}
.btn svg{width:16px;height:16px}
.btn-primary{background:var(--brand-600);color:#fff;box-shadow:0 4px 12px rgba(27,95,224,.18)}
.btn-primary:hover{background:var(--brand-700);box-shadow:var(--shadow-brand);transform:translateY(-2px)}
.btn-primary:active{transform:translateY(0);box-shadow:none}
.btn-outline{background:var(--surface);color:var(--brand-600);border-color:var(--brand-100)}
.btn-outline:hover{border-color:var(--brand-600);background:var(--brand-50);transform:translateY(-2px)}
.btn-ghost{background:transparent;color:var(--ink-600);border-color:var(--line)}
.btn-ghost:hover{color:var(--brand-600);border-color:var(--brand-100);background:var(--brand-50)}
.btn-pill{border-radius:var(--radius-pill)}
.btn-lg{padding:16px 30px;font-size:16px;border-radius:var(--radius-pill)}
.btn[disabled],.btn.is-disabled{background:var(--disabled);color:var(--ink-400);border-color:transparent;box-shadow:none;pointer-events:none}

/* ============ 面包屑 ============ */
.crumbs{padding:24px 0 0;font-size:13px;color:var(--ink-400)}
.crumbs ol{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.crumbs li{display:inline-flex;align-items:center;gap:8px}
.crumbs li+li::before{content:"/";color:var(--line)}
.crumbs a:hover{color:var(--brand-600)}
.crumbs .current{color:var(--brand-600);font-weight:600;max-width:420px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}

/* ============ 文章头部 ============ */
.article-head{padding:20px 0 28px;border-bottom:1px solid var(--line)}
.article-kicker{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin-bottom:16px}
.tag{display:inline-flex;align-items:center;gap:6px;padding:5px 12px;border-radius:var(--radius-pill);font-size:12px;font-weight:600;border:1px solid var(--line);color:var(--ink-600);background:var(--surface)}
.tag-brand{background:var(--brand-50);border-color:var(--brand-100);color:var(--brand-600)}
.tag-accent{background:rgba(23,195,162,.10);border-color:rgba(23,195,162,.28);color:#0E8C75}
.article-title{font-size:clamp(26px,4vw,38px);line-height:1.32;font-weight:700;color:var(--ink-900);letter-spacing:-.2px}
.article-lead{margin-top:16px;font-size:16px;color:var(--ink-600);max-width:780px}
.article-meta{display:flex;flex-wrap:wrap;align-items:center;gap:8px 20px;margin-top:20px;font-size:13px;color:var(--ink-400)}
.article-meta .m-item{display:inline-flex;align-items:center;gap:6px}
.article-meta svg{width:15px;height:15px;color:var(--ink-400)}
.share{display:inline-flex;align-items:center;gap:8px;margin-left:auto}
.share button{width:30px;height:30px;border-radius:50%;border:1px solid var(--line);background:var(--surface);display:inline-flex;align-items:center;justify-content:center;cursor:pointer;color:var(--ink-400);transition:all var(--dur) var(--ease)}
.share button:hover{color:var(--brand-600);border-color:var(--brand-100);background:var(--brand-50)}

/* ============ 布局 ============ */
.article-wrap{padding:40px 0 var(--sec-y)}
.article-layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:48px;align-items:start}
.article-main{max-width:780px;min-width:0}

/* ============ 正文排版 ============ */
.prose{font-size:17px;line-height:1.9;color:var(--ink-600);word-break:break-word}
.prose>*:first-child{margin-top:0}
.prose p{margin:0 0 20px}
.prose h2{position:relative;font-size:28px;line-height:1.35;font-weight:700;color:var(--ink-900);margin:40px 0 16px;padding-left:16px}
.prose h2::before{content:"";position:absolute;left:0;top:.32em;width:4px;height:1em;border-radius:2px;background:var(--brand-600)}
.prose h3{font-size:20px;font-weight:600;color:var(--ink-900);margin:28px 0 12px}
.prose h4{font-size:17px;font-weight:600;color:var(--ink-900);margin:22px 0 10px}
.prose ul{margin:0 0 20px;padding:0}
.prose ul>li{position:relative;padding-left:20px;margin-bottom:10px}
.prose ul>li::before{content:"";position:absolute;left:2px;top:.68em;width:6px;height:6px;border-radius:1px;background:var(--accent)}
.prose ol{margin:0 0 20px;padding:0;counter-reset:pl}
.prose ol>li{position:relative;padding-left:30px;margin-bottom:10px;counter-increment:pl}
.prose ol>li::before{content:counter(pl);position:absolute;left:0;top:.28em;width:20px;height:20px;border-radius:6px;background:var(--brand-50);color:var(--brand-600);font-size:12px;font-weight:700;display:flex;align-items:center;justify-content:center;font-family:var(--font-mono)}
.prose blockquote{margin:0 0 20px;padding:20px 22px;background:var(--brand-50);border-left:3px solid var(--brand-600);border-radius:0 var(--radius) var(--radius) 0;color:var(--ink-600)}
.prose blockquote p:last-child{margin-bottom:0}
.prose a{color:var(--brand-600);text-decoration:underline;text-underline-offset:3px}
.prose a:hover{color:var(--brand-700)}
.prose img{border-radius:var(--radius);margin:24px auto;box-shadow:var(--shadow-sm)}
.prose figure{margin:24px 0}
.prose figcaption{font-size:13px;color:var(--ink-400);text-align:center;margin-top:10px}
.prose strong{color:var(--ink-900);font-weight:600}
.prose hr{border:0;height:1px;background:var(--line);margin:36px 0}
.prose table{width:100%;border-collapse:collapse;margin:0 0 24px;font-size:15px}
.prose th,.prose td{border:1px solid var(--line);padding:10px 14px;text-align:left;vertical-align:top}
.prose th{background:var(--brand-50);color:var(--ink-900);font-weight:600}
.prose tbody tr:hover{background:#FAFCFF}
.prose pre{background:var(--ink-900);color:var(--brand-100);padding:16px 18px;border-radius:var(--radius);overflow-x:auto;font-family:var(--font-mono);font-size:13px;line-height:1.7;margin:0 0 20px}
.prose code{font-family:var(--font-mono);font-size:.92em;background:var(--brand-50);color:var(--brand-700);padding:2px 6px;border-radius:6px}
.prose pre code{background:none;color:inherit;padding:0}

/* ============ 空态 ============ */
.empty-state{background:var(--surface);border:1px dashed var(--brand-100);border-radius:var(--radius-card);padding:56px 24px;text-align:center}
.empty-state svg{width:44px;height:44px;color:var(--brand-100);margin:0 auto 14px}
.empty-state strong{display:block;font-size:18px;color:var(--ink-900);margin-bottom:6px}
.empty-state p{font-size:14px;color:var(--ink-400);margin-bottom:18px}

/* ============ 文章尾部 ============ */
.article-foot{margin-top:44px;padding-top:28px;border-top:1px solid var(--line)}
.foot-label{font-size:13px;font-weight:600;color:var(--ink-400);letter-spacing:.5px;margin-bottom:12px}
.tags{display:flex;flex-wrap:wrap;gap:10px}
.tags a{display:inline-flex;padding:7px 14px;border-radius:var(--radius-pill);border:1px solid var(--line);background:var(--surface);font-size:13px;color:var(--ink-600);transition:all var(--dur) var(--ease)}
.tags a:hover{background:var(--brand-600);border-color:var(--brand-600);color:#fff;transform:translateY(-2px)}
.pager{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-top:32px}
.pager-card{display:block;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-card);padding:20px 22px;transition:all var(--dur) var(--ease)}
.pager-card:hover{border-color:var(--brand-100);box-shadow:var(--shadow-md);transform:translateY(-2px)}
.pager-card span{display:block;font-size:12px;color:var(--ink-400);margin-bottom:8px}
.pager-card b{display:block;font-size:16px;font-weight:600;color:var(--ink-900);line-height:1.5}
.pager-card:hover b{color:var(--brand-600)}

/* ============ 相关推荐 ============ */
.related{margin-top:40px}
.related-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:16px}
.rcard{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-card);overflow:hidden;display:flex;flex-direction:column;transition:all var(--dur) var(--ease)}
.rcard:hover{box-shadow:var(--shadow-md);transform:translateY(-2px);border-color:var(--brand-100)}
.rcard img{width:100%;aspect-ratio:16/9;object-fit:cover}
.rcard-body{padding:16px 18px 18px}
.rcard-body h3{font-size:15px;font-weight:600;color:var(--ink-900);line-height:1.5;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.rcard-body p{margin-top:8px;font-size:13px;color:var(--ink-400);line-height:1.7;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.rcard-body .rmeta{margin-top:12px;font-size:12px;color:var(--ink-400);display:flex;justify-content:space-between;gap:10px}
.rcard:hover h3{color:var(--brand-600)}
.back-row{margin-top:32px;display:flex;justify-content:center}

/* ============ 侧栏 ============ */
.sidebar{position:sticky;top:96px;display:flex;flex-direction:column;gap:20px}
.side-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-card);padding:22px;box-shadow:var(--shadow-sm)}
.side-card h4{font-size:14px;font-weight:700;color:var(--ink-900);margin-bottom:14px;display:flex;align-items:center;gap:8px}
.side-card h4::before{content:"";width:4px;height:14px;border-radius:2px;background:var(--brand-600)}
.hot-list li+li{border-top:1px solid var(--line)}
.hot-list a{display:flex;gap:12px;padding:12px 0;font-size:14px;color:var(--ink-600);line-height:1.6;transition:color var(--dur) var(--ease)}
.hot-list a:hover{color:var(--brand-600)}
.hot-list .num{font-family:var(--font-mono);font-size:13px;font-weight:700;color:var(--accent);flex:0 0 auto;min-width:16px}
.hot-list .num.top{color:var(--accent-warm)}
.side-cats{display:flex;flex-wrap:wrap;gap:10px}
.side-cats a{padding:7px 14px;border-radius:var(--radius-pill);background:var(--brand-50);color:var(--brand-600);font-size:13px;font-weight:500;transition:all var(--dur) var(--ease)}
.side-cats a:hover{background:var(--brand-600);color:#fff;transform:translateY(-2px)}
.side-cta{background:var(--brand-600);border-radius:var(--radius-card);padding:24px;color:#fff;box-shadow:var(--shadow-md)}
.side-cta b{display:block;font-size:17px;font-weight:700;margin-bottom:8px}
.side-cta p{font-size:13px;color:rgba(255,255,255,.86);line-height:1.7;margin-bottom:16px}
.side-cta .btn{width:100%;background:#fff;color:var(--brand-700);border-radius:var(--radius)}
.side-cta .btn:hover{background:var(--brand-50);transform:translateY(-2px);box-shadow:0 10px 22px rgba(0,0,0,.18)}
.side-cta .meta-line{margin-top:14px;padding-top:12px;border-top:1px solid rgba(255,255,255,.24);font-size:12px;font-family:var(--font-mono);color:rgba(255,255,255,.82);line-height:1.8}

/* ============ 页脚 CTA 条 ============ */
.foot-cta{background:linear-gradient(90deg,var(--brand-600),#2C74F0);color:#fff}
.foot-cta-inner{display:flex;align-items:center;justify-content:space-between;gap:24px;padding:32px 0}
.foot-cta b{display:block;font-size:20px;font-weight:700;line-height:1.4}
.foot-cta span{display:block;font-size:13px;color:rgba(255,255,255,.84);margin-top:6px}
.foot-cta .btn{background:#fff;color:var(--brand-700);border-radius:var(--radius-pill);padding:14px 28px}
.foot-cta .btn:hover{background:var(--brand-50);transform:translateY(-2px);box-shadow:0 12px 26px rgba(0,0,0,.18)}

/* ============ 页脚 ============ */
.site-footer{background:var(--surface);border-top:1px solid var(--line);padding:64px 0 0}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1.2fr;gap:40px;padding-bottom:44px}
.footer-brand .logo{margin-bottom:16px}
.footer-brand p{font-size:14px;line-height:1.8;color:var(--ink-400);max-width:340px}
.footer-col h4{font-size:14px;font-weight:700;color:var(--ink-900);margin-bottom:16px}
.footer-col ul li{margin-bottom:10px}
.footer-col ul a{font-size:14px;color:var(--ink-600);transition:color var(--dur) var(--ease)}
.footer-col ul a:hover{color:var(--brand-600)}
.footer-version b{display:block;font-size:14px;color:var(--ink-900);font-weight:600;margin-bottom:8px}
.footer-version p{font-size:13px;color:var(--ink-400);line-height:1.9;font-family:var(--font-mono)}
.footer-bottom{display:flex;align-items:center;justify-content:space-between;gap:16px;border-top:1px solid var(--line);padding:20px 0;font-size:13px;color:var(--ink-400)}

/* ============ 返回顶部 ============ */
.to-top{position:fixed;right:24px;bottom:28px;width:44px;height:44px;border-radius:50%;background:var(--surface);border:1px solid var(--line);box-shadow:var(--shadow-md);display:flex;align-items:center;justify-content:center;color:var(--brand-600);cursor:pointer;opacity:0;visibility:hidden;transform:translateY(10px);transition:all var(--dur) var(--ease);z-index:80}
.to-top.show{opacity:1;visibility:visible;transform:translateY(0)}
.to-top:hover{background:var(--brand-600);color:#fff;border-color:var(--brand-600)}

/* ============ 响应式 ============ */
@media (max-width:1180px){
  .article-layout{grid-template-columns:minmax(0,1fr) 268px;gap:32px}
  .container{padding:0 24px}
}
@media (max-width:1023px){
  :root{--sec-y:72px}
  .topbar-links{display:none}
  .nav-inner{flex-wrap:wrap;gap:12px;padding:12px 0}
  .nav-chips{order:3;width:100%;margin:0;overflow-x:auto;scroll-snap-type:x mandatory;-ms-overflow-style:none;scrollbar-width:none;justify-content:flex-start}
  .nav-chips::-webkit-scrollbar{display:none}
  .chip{scroll-snap-align:start}
  .nav-actions{margin-left:auto}
  .article-layout{grid-template-columns:1fr}
  .article-main{max-width:100%}
  .sidebar{position:static;margin-top:8px}
  .related-grid{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
}
@media (max-width:767px){
  :root{--sec-y:56px}
  .container{padding:0 20px}
  .btn-nav{padding:9px 14px;font-size:13px}
  .logo-text{font-size:17px}
  .article-title{font-size:26px}
  .prose{font-size:16px;line-height:1.85}
  .prose h2{font-size:22px;margin:32px 0 14px}
  .prose h3{font-size:18px}
  .pager{grid-template-columns:1fr}
  .related-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr;gap:28px}
  .footer-bottom{flex-direction:column;align-items:flex-start}
  .foot-cta-inner{flex-direction:column;align-items:flex-start}
  .crumbs .current{max-width:200px}
  .share{margin-left:0}
}
@media (max-width:400px){
  .container{padding:0 16px}
  .btn{padding:10px 16px}
}
@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important;scroll-behavior:auto!important}
}

/* roulang page: category1 */
:root{
  --brand-600:#1B5FE0;
  --brand-700:#1449B3;
  --brand-50:#EEF4FF;
  --brand-100:#D8E6FF;
  --accent:#17C3A2;
  --accent-warm:#FF8A3D;
  --ink-900:#0E1B2E;
  --ink-600:#4A5B73;
  --ink-400:#8A99AE;
  --line:#E3E9F2;
  --bg:#F5F8FD;
  --surface:#FFFFFF;
  --ok:#12A36B;
  --warn:#E8A400;
  --err:#D93B3B;
  --disabled:#C7D0DD;
  --shadow-sm:0 2px 8px rgba(16,42,86,.06);
  --shadow-md:0 8px 24px rgba(16,42,86,.08);
  --shadow-lg:0 16px 40px rgba(16,42,86,.10);
  --shadow-brand:0 10px 24px rgba(27,95,224,.28);
  --radius-card:16px;
  --radius-lg:24px;
  --radius-btn:12px;
  --radius-pill:999px;
  --ease:cubic-bezier(.2,.7,.3,1);
  --sp-section:96px;
  --sp-section-md:72px;
  --sp-section-sm:56px;
  --container:1200px;
  --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;
  --sans:"PingFang SC","HarmonyOS Sans","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
}

*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  font-family:var(--sans);
  font-size:16px;
  line-height:1.8;
  color:var(--ink-600);
  background:var(--bg);
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;height:auto;}
a{color:var(--brand-600);text-decoration:none;transition:color .2s var(--ease);}
a:hover{color:var(--brand-700);}
h1,h2,h3,h4{color:var(--ink-900);margin:0;line-height:1.3;font-weight:600;}
p{margin:0;}
ul,ol{margin:0;padding:0;list-style:none;}
button{font-family:inherit;}
:focus-visible{outline:2px solid var(--brand-600);outline-offset:2px;border-radius:6px;}

.container{
  width:100%;
  max-width:var(--container);
  margin:0 auto;
  padding:0 32px;
}

/* ---------- header ---------- */
.mainnav{
  position:sticky;
  top:0;
  z-index:60;
  background:var(--surface);
  border-bottom:1px solid var(--line);
  transition:box-shadow .22s var(--ease);
}
.mainnav.is-stuck{box-shadow:var(--shadow-sm);}
.nav-inner{
  display:flex;
  align-items:center;
  gap:32px;
  min-height:68px;
  padding-top:12px;
  padding-bottom:12px;
}
.logo{
  display:inline-flex;
  align-items:center;
  gap:10px;
  color:var(--ink-900);
  flex:0 0 auto;
}
.logo:hover{color:var(--ink-900);}
.logo-mark{width:36px;height:36px;flex:0 0 auto;}
.logo-text{font-weight:700;font-size:19px;letter-spacing:.2px;color:var(--brand-600);}

.nav-chips{
  display:flex;
  align-items:center;
  gap:4px;
  padding:4px;
  background:var(--brand-50);
  border-radius:var(--radius-pill);
  margin-left:auto;
}
.chip{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  padding:8px 18px;
  border-radius:var(--radius-pill);
  font-size:15px;
  font-weight:500;
  color:var(--ink-600);
  white-space:nowrap;
  transition:background .2s var(--ease),color .2s var(--ease),box-shadow .2s var(--ease);
}
.chip:hover{background:rgba(255,255,255,.7);color:var(--brand-600);}
.chip.is-active{
  background:var(--surface);
  color:var(--brand-600);
  font-weight:600;
  box-shadow:var(--shadow-sm);
}
.chip[aria-disabled="true"]{color:var(--disabled);pointer-events:none;}

.nav-actions{
  display:flex;
  align-items:center;
  gap:12px;
  flex:0 0 auto;
}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:11px 22px;
  font-size:15px;
  font-weight:600;
  border-radius:var(--radius-btn);
  border:1px solid transparent;
  cursor:pointer;
  transition:background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease),box-shadow .2s var(--ease),transform .2s var(--ease);
  background:none;
}
.btn:active{transform:translateY(1px);}
.btn-primary{
  background:var(--brand-600);
  color:#fff;
  box-shadow:0 4px 12px rgba(27,95,224,.20);
}
.btn-primary:hover{background:var(--brand-700);color:#fff;box-shadow:var(--shadow-brand);}
.btn-outline{
  border-color:var(--brand-100);
  background:var(--surface);
  color:var(--brand-600);
}
.btn-outline:hover{border-color:var(--brand-600);background:var(--brand-50);color:var(--brand-700);}
.btn-ghost{
  border-color:transparent;
  background:transparent;
  color:var(--ink-600);
}
.btn-ghost:hover{background:var(--brand-50);color:var(--brand-600);}
.btn-lg{height:56px;padding:0 30px;font-size:17px;border-radius:var(--radius-pill);}
.btn-nav{padding:9px 18px;font-size:14px;}
.btn[disabled]{background:var(--disabled);color:var(--ink-400);box-shadow:none;cursor:not-allowed;}

/* ---------- breadcrumb ---------- */
.crumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-size:13px;
  color:var(--ink-400);
  padding:28px 0 0;
}
.crumb a{color:var(--ink-400);}
.crumb a:hover{color:var(--brand-600);}
.crumb .sep{color:var(--brand-100);}
.crumb .current{color:var(--brand-600);font-weight:600;}

/* ---------- hero ---------- */
.cat-hero{
  position:relative;
  background:
    linear-gradient(100deg,rgba(245,248,253,.94),rgba(238,244,255,.90)),
    url('/assets/images/backpic/back-2.png') center/cover no-repeat;
  border-bottom:1px solid var(--line);
  padding-bottom:72px;
  overflow:hidden;
}
.cat-hero::after{
  content:"";
  position:absolute;
  right:-120px;
  top:-80px;
  width:520px;
  height:520px;
  border-radius:50%;
  border:1px dashed rgba(27,95,224,.14);
  pointer-events:none;
}
.cat-hero-grid{
  display:grid;
  grid-template-columns:minmax(0,1.05fr) minmax(0,.95fr);
  gap:56px;
  align-items:center;
  padding-top:32px;
  position:relative;
  z-index:1;
}
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:6px 14px;
  border-radius:var(--radius-pill);
  background:var(--brand-50);
  border:1px solid var(--brand-100);
  color:var(--brand-600);
  font-size:13px;
  font-weight:600;
}
.eyebrow .dot{width:6px;height:6px;border-radius:50%;background:var(--accent);}
.cat-hero h1{
  margin:20px 0 18px;
  font-size:clamp(28px,4.2vw,42px);
  font-weight:700;
  letter-spacing:.2px;
}
.lede{
  font-size:16px;
  line-height:1.9;
  color:var(--ink-600);
  max-width:640px;
}
.hero-actions{
  display:flex;
  flex-wrap:wrap;
  gap:14px;
  margin-top:30px;
}
.badge-row{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  margin-top:28px;
}
.badge{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:7px 14px;
  border-radius:var(--radius-pill);
  border:1px solid var(--line);
  background:rgba(255,255,255,.75);
  font-size:13px;
  color:var(--ink-600);
}
.badge b{color:var(--ink-900);font-weight:600;}
.badge .num{font-family:var(--mono);font-variant-numeric:tabular-nums;}

.cat-hero-media{
  margin:0;
  border-radius:var(--radius-lg);
  overflow:hidden;
  border:1px solid var(--line);
  background:var(--surface);
  box-shadow:var(--shadow-lg);
}
.cat-hero-media img{
  width:100%;
  aspect-ratio:16/10;
  object-fit:cover;
}
.media-caption{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  padding:14px 20px;
  font-size:13px;
  color:var(--ink-400);
  border-top:1px solid var(--line);
}
.media-caption .mono{font-family:var(--mono);font-variant-numeric:tabular-nums;color:var(--ink-600);}

/* ---------- sections ---------- */
.section{padding:var(--sp-section) 0;}
.section.tight{padding-top:0;}
.section-head{
  display:flex;
  align-items:flex-end;
  justify-content:space-between;
  gap:24px;
  margin-bottom:40px;
}
.section-head h2{
  font-size:28px;
  font-weight:700;
  position:relative;
  padding-left:14px;
}
.section-head h2::before{
  content:"";
  position:absolute;
  left:0;
  top:6px;
  bottom:6px;
  width:4px;
  border-radius:2px;
  background:var(--brand-600);
}
.section-head p{
  max-width:520px;
  font-size:14px;
  color:var(--ink-400);
}
.section-head .more{
  font-size:14px;
  font-weight:600;
  white-space:nowrap;
}

/* ---------- range strip ---------- */
.range-grid{
  display:grid;
  grid-template-columns:repeat(4,minmax(0,1fr));
  gap:0;
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
}
.range-item{
  padding:36px 28px 40px;
  border-left:1px solid var(--line);
}
.range-item:first-child{border-left:0;padding-left:0;}
.range-item .idx{
  display:block;
  font-family:var(--mono);
  font-variant-numeric:tabular-nums;
  font-size:34px;
  font-weight:700;
  color:var(--accent);
  opacity:.85;
  line-height:1;
  margin-bottom:16px;
}
.range-item h3{font-size:18px;margin-bottom:10px;}
.range-item p{font-size:14px;line-height:1.85;color:var(--ink-600);}
.range-item:nth-child(2){padding-top:56px;}
.range-item:nth-child(3){padding-top:28px;}
.range-item:nth-child(4){padding-top:64px;}

/* ---------- alternating feature blocks ---------- */
.feature-flow{display:grid;gap:28px;}
.feature-row{
  display:grid;
  grid-template-columns:minmax(0,1fr) minmax(0,1.1fr);
  gap:36px;
  align-items:center;
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--radius-lg);
  padding:28px;
  box-shadow:var(--shadow-sm);
  transition:box-shadow .22s var(--ease),transform .22s var(--ease);
}
.feature-row:hover{box-shadow:var(--shadow-md);transform:translateY(-2px);}
.feature-row.reverse .feature-media{order:2;}
.feature-media{
  margin:0;
  border-radius:var(--radius-card);
  overflow:hidden;
  border:1px solid var(--line);
}
.feature-media img{width:100%;aspect-ratio:4/3;object-fit:cover;}
.feature-body h3{font-size:21px;margin-bottom:12px;}
.feature-body p{font-size:15px;line-height:1.9;}
.tag-row{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px;}
.tag{
  display:inline-flex;
  align-items:center;
  padding:5px 12px;
  border-radius:var(--radius-pill);
  border:1px solid var(--brand-100);
  background:var(--brand-50);
  color:var(--brand-600);
  font-size:12px;
  font-weight:600;
}

/* ---------- scenes (definition rows) ---------- */
.scene-wrap{
  display:grid;
  grid-template-columns:minmax(0,1fr) minmax(0,1.25fr);
  gap:40px;
  align-items:start;
}
.scene-aside{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--radius-lg);
  padding:28px;
  box-shadow:var(--shadow-sm);
}
.scene-aside h3{font-size:19px;margin-bottom:12px;}
.scene-aside p{font-size:14px;line-height:1.9;color:var(--ink-600);}
.scene-aside .side-img{
  margin-top:22px;
  border-radius:var(--radius-card);
  overflow:hidden;
  border:1px solid var(--line);
}
.scene-aside .side-img img{width:100%;aspect-ratio:16/10;object-fit:cover;}
.deflist{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--radius-lg);
  overflow:hidden;
  box-shadow:var(--shadow-sm);
}
.defrow{
  display:grid;
  grid-template-columns:180px minmax(0,1fr);
  gap:20px;
  padding:22px 26px;
  border-bottom:1px solid var(--line);
  transition:background .2s var(--ease);
}
.defrow:last-child{border-bottom:0;}
.defrow:hover{background:var(--bg);}
.defrow dt{
  color:var(--ink-900);
  font-weight:600;
  font-size:15px;
}
.defrow dd{
  margin:0;
  font-size:14px;
  line-height:1.85;
  color:var(--ink-600);
}
.defrow dd .mono{
  font-family:var(--mono);
  font-variant-numeric:tabular-nums;
  color:var(--ok);
  font-weight:600;
}

/* ---------- steps ---------- */
.steps{
  display:grid;
  grid-template-columns:repeat(4,minmax(0,1fr));
  gap:20px;
  counter-reset:step;
}
.step{
  position:relative;
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--radius-card);
  padding:26px 22px;
  box-shadow:var(--shadow-sm);
  transition:transform .22s var(--ease),box-shadow .22s var(--ease);
}
.step:hover{transform:translateY(-2px);box-shadow:var(--shadow-md);}
.step::before{
  counter-increment:step;
  content:counter(step,decimal-leading-zero);
  display:block;
  font-family:var(--mono);
  font-variant-numeric:tabular-nums;
  font-size:13px;
  font-weight:700;
  color:var(--brand-600);
  background:var(--brand-50);
  border:1px solid var(--brand-100);
  border-radius:var(--radius-pill);
  padding:3px 10px;
  width:max-content;
  margin-bottom:16px;
}
.step h3{font-size:17px;margin-bottom:8px;}
.step p{font-size:14px;line-height:1.85;color:var(--ink-600);}
.step-line{
  margin-top:26px;
  display:flex;
  align-items:center;
  gap:12px;
  font-size:13px;
  color:var(--ink-400);
}
.step-line .bar{
  flex:1;
  height:1px;
  background:linear-gradient(90deg,var(--brand-100),rgba(216,230,255,0));
}

/* ---------- faq ---------- */
.faq-list{display:grid;gap:14px;max-width:900px;}
.faq-item{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--radius-card);
  box-shadow:var(--shadow-sm);
  transition:box-shadow .2s var(--ease),background .2s var(--ease);
}
.faq-item:hover{box-shadow:var(--shadow-md);}
.faq-item[open]{box-shadow:inset 3px 0 0 var(--brand-600),var(--shadow-md);}
.faq-item summary{
  list-style:none;
  cursor:pointer;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:18px;
  padding:20px 26px;
  font-size:16px;
  font-weight:600;
  color:var(--ink-900);
}
.faq-item summary::-webkit-details-marker{display:none;}
.faq-item summary::after{
  content:"+";
  flex:0 0 auto;
  width:26px;
  height:26px;
  display:grid;
  place-items:center;
  border-radius:50%;
  background:var(--brand-50);
  color:var(--brand-600);
  font-size:18px;
  font-weight:600;
  line-height:1;
}
.faq-item[open] summary::after{content:"−";background:var(--brand-600);color:#fff;}
.faq-body{
  padding:0 26px 22px;
  font-size:15px;
  line-height:1.9;
  color:var(--ink-600);
}

/* ---------- cta band ---------- */
.cta-band{
  background:linear-gradient(120deg,var(--brand-600),var(--brand-700));
  border-radius:var(--radius-lg);
  padding:44px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:32px;
  box-shadow:var(--shadow-lg);
  position:relative;
  overflow:hidden;
}
.cta-band::after{
  content:"";
  position:absolute;
  right:-60px;
  bottom:-90px;
  width:280px;
  height:280px;
  border-radius:50%;
  border:1px solid rgba(255,255,255,.18);
}
.cta-band h2{color:#fff;font-size:26px;margin-bottom:10px;}
.cta-band p{color:rgba(255,255,255,.82);font-size:15px;max-width:620px;}
.cta-band .btn-primary{
  background:#fff;
  color:var(--brand-600);
  box-shadow:0 12px 26px rgba(9,30,70,.24);
}
.cta-band .btn-primary:hover{background:#F2F6FF;color:var(--brand-700);}

/* ---------- footer ---------- */
.site-footer{
  background:var(--surface);
  border-top:1px solid var(--line);
  margin-top:var(--sp-section);
  padding-top:64px;
}
.footer-grid{
  display:grid;
  grid-template-columns:1.5fr 1fr 1fr 1.2fr;
  gap:40px;
  padding-bottom:44px;
}
.footer-brand p{
  margin-top:16px;
  font-size:14px;
  line-height:1.9;
  color:var(--ink-600);
  max-width:340px;
}
.footer-col h4{
  font-size:15px;
  margin-bottom:16px;
  color:var(--ink-900);
}
.footer-col ul{display:grid;gap:10px;}
.footer-col a{
  font-size:14px;
  color:var(--ink-600);
}
.footer-col a:hover{color:var(--brand-600);}
.footer-version b{
  display:block;
  font-family:var(--mono);
  font-variant-numeric:tabular-nums;
  color:var(--brand-600);
  font-size:14px;
  margin-bottom:10px;
}
.footer-version p{font-size:13px;line-height:1.9;color:var(--ink-400);}
.footer-bottom{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  flex-wrap:wrap;
  padding:22px 0 28px;
  border-top:1px solid var(--line);
  font-size:13px;
  color:var(--ink-400);
}
.footer-bottom .mono{font-family:var(--mono);}
.footer-bottom a{color:var(--ink-400);}
.footer-bottom a:hover{color:var(--brand-600);}

/* ---------- to top ---------- */
#toTop{
  position:fixed;
  right:24px;
  bottom:24px;
  width:46px;
  height:46px;
  border-radius:50%;
  border:1px solid var(--brand-100);
  background:var(--surface);
  color:var(--brand-600);
  box-shadow:var(--shadow-md);
  display:grid;
  place-items:center;
  cursor:pointer;
  opacity:0;
  pointer-events:none;
  transform:translateY(8px);
  transition:opacity .24s var(--ease),transform .24s var(--ease),box-shadow .24s var(--ease);
  z-index:70;
}
#toTop.is-show{opacity:1;pointer-events:auto;transform:translateY(0);}
#toTop:hover{box-shadow:var(--shadow-brand);background:var(--brand-50);}

/* ---------- responsive ---------- */
@media (max-width:1279px){
  .container{padding:0 28px;}
  .nav-inner{gap:24px;}
}
@media (max-width:1023px){
  :root{--sp-section:var(--sp-section-md);}
  .nav-inner{flex-wrap:wrap;min-height:auto;padding-top:14px;padding-bottom:0;gap:14px;}
  .logo{order:1;}
  .nav-actions{order:2;margin-left:auto;}
  .nav-chips{
    order:3;
    width:100%;
    margin:0 0 14px;
    overflow-x:auto;
    scroll-snap-type:x proximity;
    -ms-overflow-style:none;
    scrollbar-width:none;
  }
  .nav-chips::-webkit-scrollbar{display:none;}
  .chip{scroll-snap-align:start;}
  .cat-hero-grid{grid-template-columns:1fr;gap:36px;padding-top:24px;}
  .cat-hero{padding-bottom:56px;}
  .range-grid{grid-template-columns:repeat(2,minmax(0,1fr));}
  .range-item:nth-child(odd){border-left:0;padding-left:0;}
  .range-item:nth-child(even){padding-left:28px;}
  .range-item:nth-child(2),.range-item:nth-child(4){padding-top:36px;}
  .range-item:nth-child(1),.range-item:nth-child(3){padding-top:36px;}
  .range-item{border-top:1px solid var(--line);}
  .range-item:nth-child(1),.range-item:nth-child(2){border-top:0;}
  .steps{grid-template-columns:repeat(2,minmax(0,1fr));}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px;}
  .cta-band{flex-direction:column;align-items:flex-start;padding:36px;}
}
@media (max-width:767px){
  :root{--sp-section:var(--sp-section-sm);}
  .container{padding:0 20px;}
  .cat-hero h1{font-size:clamp(24px,6.4vw,30px);}
  .lede{font-size:15px;}
  .hero-actions .btn{flex:1 1 auto;}
  .section-head{flex-direction:column;align-items:flex-start;gap:12px;}
  .section-head h2{font-size:23px;}
  .range-grid{grid-template-columns:1fr;}
  .range-item{border-left:0;padding-left:0;padding-top:28px !important;padding-bottom:28px;}
  .range-item:first-child{border-top:0;}
  .feature-row{grid-template-columns:1fr;padding:20px;gap:20px;}
  .feature-row.reverse .feature-media{order:0;}
  .scene-wrap{grid-template-columns:1fr;}
  .defrow{grid-template-columns:1fr;gap:6px;padding:20px;}
  .steps{grid-template-columns:1fr;}
  .cta-band{padding:28px;border-radius:var(--radius-card);}
  .cta-band h2{font-size:21px;}
  .footer-grid{grid-template-columns:1fr;gap:28px;}
  .footer-brand p{max-width:none;}
  .faq-item summary{padding:18px 20px;font-size:15px;}
  .faq-body{padding:0 20px 20px;}
  .site-footer{margin-top:var(--sp-section-sm);}
  #toTop{right:16px;bottom:16px;width:42px;height:42px;}
}
@media (max-width:400px){
  .container{padding:0 16px;}
  .logo-text{font-size:17px;}
  .btn{padding:10px 16px;}
}
@media (prefers-reduced-motion:reduce){
  *{transition:none !important;animation:none !important;scroll-behavior:auto !important;}
}

/* roulang page: category2 */
:root{
  --brand-600:#1B5FE0;
  --brand-700:#1449B3;
  --brand-50:#EEF4FF;
  --brand-100:#D8E6FF;
  --accent:#17C3A2;
  --accent-warm:#FF8A3D;
  --ink-900:#0E1B2E;
  --ink-600:#4A5B73;
  --ink-400:#8A99AE;
  --line:#E3E9F2;
  --bg:#F5F8FD;
  --surface:#FFFFFF;
  --ok:#12A36B;
  --warn:#E8A400;
  --err:#D93B3B;
  --disabled:#C7D0DD;
  --r-card:16px;
  --r-block:24px;
  --r-btn:12px;
  --r-pill:999px;
  --r-img:12px;
  --shadow-sm:0 2px 8px rgba(16,42,86,.06);
  --shadow-md:0 8px 24px rgba(16,42,86,.08);
  --shadow-lg:0 16px 40px rgba(16,42,86,.10);
  --shadow-btn:0 10px 22px rgba(27,95,224,.28);
  --ease:cubic-bezier(.2,.7,.3,1);
  --dur:220ms;
  --section:96px;
  --font-cn:"PingFang SC","HarmonyOS Sans","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  font-family:var(--font-cn);
  font-size:16px;
  line-height:1.75;
  color:var(--ink-600);
  background:var(--bg);
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{margin:0;color:var(--ink-900);line-height:1.3;font-weight:600}
p{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
a{color:var(--brand-600);text-decoration:none;transition:color var(--dur) var(--ease)}
a:hover{color:var(--brand-700)}
img{max-width:100%;display:block;height:auto}
button{font-family:inherit}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
:focus-visible{outline:2px solid var(--brand-600);outline-offset:2px;border-radius:6px}
.container{width:100%;max-width:1200px;margin:0 auto;padding:0 32px}
.skip-link{
  position:absolute;left:-9999px;top:0;background:var(--brand-600);color:#fff;
  padding:10px 18px;border-radius:0 0 10px 0;z-index:999;
}
.skip-link:focus{left:0;color:#fff}

/* ---------- 导航 ---------- */
.mainnav{
  position:sticky;top:0;z-index:80;background:var(--surface);
  border-bottom:1px solid var(--line);transition:box-shadow var(--dur) var(--ease);
}
.mainnav.is-scrolled{box-shadow:var(--shadow-sm)}
.nav-inner{display:flex;align-items:center;gap:24px;height:68px}
.logo{display:inline-flex;align-items:center;gap:10px;flex-shrink:0}
.logo-mark{width:36px;height:36px;flex-shrink:0}
.logo-text{font-size:19px;font-weight:700;color:var(--ink-900);letter-spacing:.2px}
.logo:hover .logo-text{color:var(--brand-600)}
.nav-chips{
  display:flex;align-items:center;gap:4px;background:var(--brand-50);
  padding:4px;border-radius:var(--r-pill);margin:0 auto;
  overflow-x:auto;scrollbar-width:none;-ms-overflow-style:none;scroll-snap-type:x mandatory;
}
.nav-chips::-webkit-scrollbar{display:none}
.chip{
  display:inline-block;padding:8px 16px;border-radius:var(--r-pill);
  font-size:14px;font-weight:500;color:var(--ink-600);white-space:nowrap;
  scroll-snap-align:start;transition:background var(--dur) var(--ease),color var(--dur) var(--ease),box-shadow var(--dur) var(--ease);
}
.chip:hover{background:#E2ECFF;color:var(--brand-600)}
.chip.is-active{background:var(--surface);color:var(--brand-600);font-weight:600;box-shadow:var(--shadow-sm)}
.chip[aria-disabled="true"]{color:var(--ink-400);pointer-events:none}
.nav-actions{display:flex;align-items:center;gap:10px;flex-shrink:0}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:44px;padding:0 22px;border-radius:var(--r-btn);border:1px solid transparent;
  font-size:15px;font-weight:600;cursor:pointer;white-space:nowrap;
  transition:transform var(--dur) var(--ease),box-shadow var(--dur) var(--ease),background var(--dur) var(--ease),color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.btn-primary{background:var(--brand-600);color:#fff;box-shadow:0 6px 16px rgba(27,95,224,.18)}
.btn-primary:hover{background:var(--brand-700);color:#fff;transform:translateY(-2px);box-shadow:var(--shadow-btn)}
.btn-primary:active{transform:translateY(0);box-shadow:0 4px 10px rgba(27,95,224,.24)}
.btn-outline{background:transparent;border-color:var(--brand-100);color:var(--brand-600)}
.btn-outline:hover{background:var(--brand-50);border-color:var(--brand-600);color:var(--brand-700);transform:translateY(-2px)}
.btn-ghost{background:transparent;color:var(--ink-600)}
.btn-ghost:hover{background:var(--brand-50);color:var(--brand-600)}
.btn-lg{height:56px;padding:0 34px;font-size:17px;border-radius:var(--r-pill)}
.btn-sm{height:38px;padding:0 16px;font-size:14px}
.btn:disabled,.btn.is-disabled{background:var(--disabled);color:var(--ink-400);box-shadow:none;cursor:not-allowed;transform:none}
.btn-nav{height:40px;padding:0 18px;font-size:14px}
.link-arrow{display:inline-flex;align-items:center;gap:6px;font-size:14px;font-weight:600;color:var(--brand-600)}
.link-arrow svg{transition:transform var(--dur) var(--ease)}
.link-arrow:hover svg{transform:translateX(4px)}

/* ---------- 徽章 ---------- */
.badge{
  display:inline-flex;align-items:center;gap:6px;padding:5px 12px;border-radius:var(--r-pill);
  font-size:12px;font-weight:600;letter-spacing:.3px;
}
.badge-outline{border:1px solid var(--brand-100);color:var(--brand-600);background:var(--surface)}
.badge-solid{background:var(--brand-50);color:var(--brand-700)}
.badge-accent{background:rgba(23,195,162,.12);color:#0E8D75}

/* ---------- 面包屑 ---------- */
.breadcrumb{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:13px;color:var(--ink-400);margin-bottom:20px}
.breadcrumb a{color:var(--ink-400)}
.breadcrumb a:hover{color:var(--brand-600)}
.breadcrumb .sep{color:var(--disabled)}
.breadcrumb [aria-current]{color:var(--brand-600);font-weight:600}

/* ---------- Hero ---------- */
.page-hero{
  position:relative;overflow:hidden;
  padding:64px 0 var(--section);
  background:
    linear-gradient(180deg,rgba(255,255,255,.92),rgba(238,244,255,.94)),
    url('/assets/images/backpic/back-2.png') center/cover no-repeat;
  border-bottom:1px solid var(--line);
}
.page-hero::after{
  content:"";position:absolute;inset:0;pointer-events:none;opacity:.06;
  background-image:radial-gradient(var(--brand-600) 1.4px,transparent 1.4px);
  background-size:26px 26px;
}
.page-hero .container{position:relative;z-index:1}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center}
.hero-copy h1{font-size:clamp(28px,4.2vw,42px);font-weight:700;margin:16px 0 14px;letter-spacing:-.3px}
.hero-copy .lead{font-size:17px;line-height:1.9;color:var(--ink-600);max-width:560px}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}
.hero-media{margin:0;position:relative}
.hero-media img{
  width:100%;border-radius:20px;box-shadow:var(--shadow-lg);
  border:1px solid rgba(255,255,255,.9);aspect-ratio:16/10;object-fit:cover;
}
.hero-media::before{
  content:"";position:absolute;right:-14px;bottom:-16px;width:38%;height:44%;
  border-radius:18px;background:var(--brand-100);opacity:.55;z-index:-1;
}
.hero-media figcaption{margin-top:12px;font-size:13px;color:var(--ink-400);text-align:center}

/* ---------- 数据条 ---------- */
.stat-row{
  display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:40px;
}
.stat-row li{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-card);
  padding:18px 20px;box-shadow:var(--shadow-sm);
}
.stat-row b{display:block;font-family:var(--font-mono);font-size:26px;font-weight:700;color:var(--brand-600);line-height:1.2}
.stat-row span{font-size:13px;color:var(--ink-400)}

/* ---------- 板块 ---------- */
.section{padding:var(--section) 0}
.section-alt{background:var(--surface);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:36px}
.section-head h2{font-size:28px;font-weight:700;letter-spacing:-.2px}
.section-head p{margin-top:10px;font-size:15px;color:var(--ink-400);max-width:640px}
.section-head .head-side{flex-shrink:0}

/* ---------- 筛选条 ---------- */
.filter-row{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:32px}
.filter-chip{
  display:inline-flex;align-items:center;padding:7px 15px;border-radius:var(--r-pill);
  border:1px solid var(--line);background:var(--surface);color:var(--ink-600);
  font-size:13.5px;font-weight:500;
}
.filter-chip.is-on{border-color:var(--brand-600);background:var(--brand-50);color:var(--brand-700);font-weight:600}
.filter-hint{font-size:13px;color:var(--ink-400);margin-bottom:24px}

/* ---------- 错落卡片网格 ---------- */
.stagger{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.mod-card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-card);
  padding:26px;box-shadow:var(--shadow-sm);height:100%;
  transition:transform var(--dur) var(--ease),box-shadow var(--dur) var(--ease),border-color var(--dur) var(--ease);
  display:flex;flex-direction:column;
}
.stagger > .mod-card:nth-child(even){margin-top:28px}
.mod-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-md);border-color:var(--brand-100)}
.mod-top{display:flex;align-items:center;gap:12px;margin-bottom:14px}
.mod-index{
  font-family:var(--font-mono);font-size:13px;font-weight:700;color:var(--accent);
  background:rgba(23,195,162,.10);border-radius:8px;padding:4px 8px;
}
.mod-card h3{font-size:20px;font-weight:600}
.mod-card > p{margin-top:12px;font-size:15px;line-height:1.85;color:var(--ink-600);flex:1}
.mod-list{margin-top:16px;display:flex;flex-wrap:wrap;gap:8px}
.mod-list li{
  font-size:12.5px;color:var(--brand-700);background:var(--brand-50);
  border-radius:var(--r-pill);padding:4px 11px;
}
.mod-meta{
  margin-top:18px;padding-top:14px;border-top:1px dashed var(--line);
  display:flex;flex-wrap:wrap;gap:8px 18px;font-size:12.5px;color:var(--ink-400);
}
.mod-meta span{font-family:var(--font-mono);color:var(--ink-600)}

/* ---------- 时间线 ---------- */
.timeline{position:relative;padding-left:32px;max-width:860px}
.timeline::before{
  content:"";position:absolute;left:15px;top:8px;bottom:8px;width:2px;
  background:linear-gradient(180deg,var(--brand-100),var(--line));
}
.tl-item{position:relative;padding-bottom:30px}
.tl-item:last-child{padding-bottom:0}
.tl-item::before{
  content:"";position:absolute;left:-22px;top:6px;width:12px;height:12px;border-radius:50%;
  background:var(--surface);border:3px solid var(--brand-600);
}
.tl-step{font-family:var(--font-mono);font-size:12.5px;color:var(--ink-400);letter-spacing:.6px}
.tl-item h3{font-size:18px;margin:6px 0 8px}
.tl-item p{font-size:15px;line-height:1.85}
.tl-item .tl-tag{
  display:inline-block;margin-top:10px;font-size:12.5px;color:#0E8D75;
  background:rgba(23,195,162,.10);border-radius:var(--r-pill);padding:4px 11px;
}

/* ---------- 图文交替 ---------- */
.feature-row{
  display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center;
  padding:36px 0;
}
.feature-row + .feature-row{border-top:1px solid var(--line)}
.feature-row.is-reverse .feature-media{order:2}
.feature-media{margin:0}
.feature-media img{
  width:100%;border-radius:var(--r-card);box-shadow:var(--shadow-md);
  aspect-ratio:4/3;object-fit:cover;
}
.feature-copy h3{font-size:24px;font-weight:700;margin-bottom:14px}
.feature-copy p{font-size:15.5px;line-height:1.9}
.def-card{
  margin-top:22px;background:var(--surface);border:1px solid var(--line);
  border-radius:var(--r-card);padding:8px 20px;box-shadow:var(--shadow-sm);
}
.def-row{
  display:flex;align-items:baseline;justify-content:space-between;gap:16px;
  padding:12px 0;border-bottom:1px solid var(--line);font-size:14.5px;
  transition:background var(--dur) var(--ease);
}
.def-row:last-child{border-bottom:0}
.def-row:hover{background:var(--bg)}
.def-row span{color:var(--ink-600)}
.def-row b{font-family:var(--font-mono);font-weight:600;color:var(--ink-900);text-align:right}

/* ---------- FAQ ---------- */
.faq-wrap{max-width:860px}
.faq-item{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-card);
  margin-bottom:12px;overflow:hidden;
  transition:box-shadow var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.faq-item[open]{box-shadow:var(--shadow-md);border-color:var(--brand-100)}
.faq-item summary{
  position:relative;list-style:none;cursor:pointer;
  padding:20px 24px 20px 26px;display:flex;align-items:center;gap:16px;
  font-size:16px;font-weight:600;color:var(--ink-900);
}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::before{
  content:"";position:absolute;left:0;top:16px;bottom:16px;width:3px;
  border-radius:0 3px 3px 0;background:var(--brand-600);opacity:0;
  transition:opacity var(--dur) var(--ease);
}
.faq-item[open] summary::before{opacity:1}
.faq-item summary::after{
  content:"+";margin-left:auto;font-size:21px;font-weight:400;line-height:1;
  color:var(--brand-600);transition:transform var(--dur) var(--ease);
}
.faq-item[open] summary::after{content:"−"}
.faq-item summary:hover{color:var(--brand-700)}
.faq-body{padding:0 24px 22px 26px;font-size:15px;line-height:1.9;color:var(--ink-600)}

/* ---------- CTA ---------- */
.cta-band{padding:0 0 var(--section)}
.cta-box{
  background:var(--brand-50);border:1px solid var(--brand-100);border-radius:var(--r-block);
  padding:44px 40px;display:flex;align-items:center;justify-content:space-between;gap:32px;
  position:relative;overflow:hidden;
}
.cta-box::after{
  content:"";position:absolute;right:-60px;bottom:-80px;width:260px;height:260px;
  border-radius:50%;border:18px solid rgba(27,95,224,.07);
}
.cta-box h2{font-size:26px;font-weight:700}
.cta-box p{margin-top:10px;font-size:15px;color:var(--ink-600);max-width:520px}
.cta-actions{display:flex;flex-wrap:wrap;gap:12px;flex-shrink:0;position:relative;z-index:1}
.cta-meta{margin-top:16px;font-size:12.5px;color:var(--ink-400);text-align:center}

/* ---------- 页脚 ---------- */
.site-footer{background:var(--surface);border-top:1px solid var(--line);padding:64px 0 0}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1.2fr;gap:40px}
.footer-brand p{margin-top:16px;font-size:14px;line-height:1.85;color:var(--ink-400);max-width:340px}
.footer-col h4{font-size:15px;font-weight:600;color:var(--ink-900);margin-bottom:16px}
.footer-col ul li{margin-bottom:10px}
.footer-col ul a{font-size:14px;color:var(--ink-600)}
.footer-col ul a:hover{color:var(--brand-600)}
.footer-version b{display:block;font-family:var(--font-mono);font-size:15px;color:var(--ink-900);margin-bottom:10px}
.footer-version p{font-size:13.5px;line-height:1.9;color:var(--ink-400);font-family:var(--font-mono)}
.footer-bottom{
  margin-top:48px;border-top:1px solid var(--line);padding:20px 0 28px;
  display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;
  font-size:13px;color:var(--ink-400);
}
.footer-bottom .mono{color:var(--ink-400)}

/* ---------- 返回顶部 ---------- */
#backtotop{
  position:fixed;right:24px;bottom:28px;width:46px;height:46px;border-radius:50%;
  border:1px solid var(--line);background:var(--surface);color:var(--brand-600);
  display:flex;align-items:center;justify-content:center;cursor:pointer;
  box-shadow:var(--shadow-md);opacity:0;visibility:hidden;transform:translateY(8px);
  transition:opacity var(--dur) var(--ease),transform var(--dur) var(--ease),visibility var(--dur);
  z-index:90;
}
#backtotop.show{opacity:1;visibility:visible;transform:translateY(0)}
#backtotop:hover{background:var(--brand-50);border-color:var(--brand-100)}

/* ---------- 响应式 ---------- */
@media (max-width:1279px){
  .container{padding:0 28px}
}
@media (max-width:1023px){
  :root{--section:72px}
  .nav-inner{flex-wrap:wrap;height:auto;padding:12px 0;gap:12px}
  .logo{margin-right:auto}
  .nav-chips{order:3;width:100%;margin:0}
  .nav-actions .btn-ghost{display:none}
  .hero-grid{grid-template-columns:1fr;gap:32px}
  .hero-copy .lead{max-width:none}
  .stat-row{grid-template-columns:repeat(2,1fr)}
  .feature-row{grid-template-columns:1fr;gap:28px;padding:28px 0}
  .feature-row.is-reverse .feature-media{order:0}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
}
@media (max-width:767px){
  :root{--section:56px}
  body{font-size:15.5px}
  .container{padding:0 20px}
  .section-head{flex-direction:column;align-items:flex-start;gap:12px;margin-bottom:28px}
  .section-head h2{font-size:23px}
  .stagger{grid-template-columns:1fr;gap:16px}
  .stagger > .mod-card:nth-child(even){margin-top:0}
  .mod-card{padding:22px}
  .stat-row{grid-template-columns:repeat(2,1fr);gap:12px;margin-top:30px}
  .stat-row b{font-size:22px}
  .cta-box{flex-direction:column;align-items:flex-start;padding:30px 22px}
  .cta-actions{width:100%}
  .cta-actions .btn{flex:1 1 auto}
  .footer-grid{grid-template-columns:1fr;gap:28px}
  .footer-bottom{flex-direction:column;align-items:flex-start;gap:8px}
  .timeline{padding-left:26px}
  .timeline::before{left:11px}
  .tl-item::before{left:-18px;width:10px;height:10px;border-width:2.5px}
  .page-hero{padding-top:40px}
  #backtotop{right:16px;bottom:18px;width:42px;height:42px}
}
@media (max-width:400px){
  .container{padding:0 16px}
  .logo-text{font-size:17px}
  .stat-row{grid-template-columns:1fr}
}
@media (prefers-reduced-motion:reduce){
  *{animation-duration:.01ms !important;transition-duration:.01ms !important;scroll-behavior:auto !important}
}