/* roulang page: index */
:root{
  --ink-900:#0B0C15;
  --ink-800:#121422;
  --ink-700:#1B1E33;
  --ink-600:#262A44;
  --sand-050:#FAF8F4;
  --sand-100:#F3F0E9;
  --sand-200:#E6E1D6;
  --line-dark:rgba(255,255,255,.10);
  --line-light:#E3DFD6;
  --primary:#21D4C4;
  --primary-deep:#0F9E93;
  --accent:#FF3D7C;
  --accent-deep:#E11D5F;
  --text-on-dark:#EDEEF6;
  --text-on-dark-2:#A8ADC4;
  --text-on-light:#14161F;
  --text-on-light-2:#5B6072;
  --text-on-light-3:#8A8F9F;
  --ok:#2BB673;
  --warn:#E8A33D;
  --error:#E05353;
  --info:#4C8BFF;
  --r-card:16px;
  --r-img:14px;
  --r-btn:10px;
  --r-pill:999px;
  --sh-light:0 1px 2px rgba(16,18,32,.04),0 12px 28px rgba(16,18,32,.07);
  --sh-dark:0 0 0 1px rgba(255,255,255,.06),0 18px 44px rgba(0,0,0,.45);
  --font-sans:"PingFang SC","Microsoft YaHei","Noto Sans SC","Hiragino Sans GB",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-num:"Space Grotesk","Inter",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --sidebar-w:240px;
  --ease:cubic-bezier(.2,.7,.3,1);
}

*,*::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:1.8;
  color:var(--text-on-light);
  background:var(--sand-050);
  letter-spacing:0;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;border-style:none}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit}
h1,h2,h3,h4,p{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
:focus-visible{outline:2px solid var(--primary);outline-offset:2px;border-radius:4px}
::selection{background:rgba(33,212,196,.28)}

.skip-link{
  position:absolute;left:-9999px;top:0;z-index:200;
  background:var(--primary);color:var(--ink-900);padding:10px 18px;border-radius:0 0 10px 0;font-weight:600;
}
.skip-link:focus{left:0}

/* ============ 布局骨架 ============ */
.topbar{
  position:fixed;top:0;left:0;right:0;height:56px;z-index:70;
  display:flex;align-items:center;gap:14px;padding:0 16px;
  background:rgba(11,12,21,.94);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line-dark);
}
.topbar .brand-mini{
  display:flex;align-items:center;gap:9px;color:var(--text-on-dark);
  font-size:17px;font-weight:700;
}
.menu-btn{
  width:40px;height:40px;border-radius:10px;border:1px solid var(--line-dark);
  background:transparent;display:flex;align-items:center;justify-content:center;
  cursor:pointer;transition:background .18s var(--ease),border-color .18s var(--ease);
}
.menu-btn:hover{background:rgba(255,255,255,.07);border-color:rgba(255,255,255,.2)}
.menu-btn span{display:block;position:relative;width:18px;height:2px;background:var(--text-on-dark);border-radius:2px}
.menu-btn span::before,.menu-btn span::after{
  content:"";position:absolute;left:0;width:18px;height:2px;background:var(--text-on-dark);border-radius:2px;
}
.menu-btn span::before{top:-6px}
.menu-btn span::after{top:6px}

.sidebar{
  position:fixed;top:0;left:0;bottom:0;width:min(86vw,320px);
  background:var(--ink-900);
  border-right:1px solid var(--line-dark);
  display:flex;flex-direction:column;
  padding:0 16px 22px;
  transform:translateX(-100%);
  transition:transform .24s var(--ease);
  z-index:80;
  overflow-y:auto;
  scrollbar-width:thin;
}
.sidebar.open{transform:translateX(0)}

.backdrop{
  position:fixed;inset:0;background:rgba(11,12,21,.6);
  opacity:0;visibility:hidden;transition:opacity .2s var(--ease),visibility .2s var(--ease);z-index:75;
}
.backdrop.show{opacity:1;visibility:visible}

.brand{
  height:72px;flex:0 0 auto;
  display:flex;align-items:center;gap:10px;
  padding:0 8px;
  border-bottom:1px solid var(--line-dark);
  color:var(--text-on-dark);
  font-size:18px;font-weight:700;
}
.brand-mark{
  width:26px;height:26px;flex:0 0 auto;border-radius:8px;
  background:linear-gradient(140deg,var(--primary),#0C7C74);
  display:flex;align-items:center;justify-content:center;
  box-shadow:0 0 0 1px rgba(33,212,196,.28);
}
.brand-mark svg{width:15px;height:15px;fill:var(--ink-900)}
.brand-mark--mini{width:22px;height:22px;border-radius:7px;box-shadow:none}
.brand-mark--mini svg{width:13px;height:13px}

.nav-list{flex:1 1 auto;padding:20px 0;display:flex;flex-direction:column;gap:6px}
.nav-link{
  position:relative;display:flex;align-items:center;gap:10px;
  min-height:44px;padding:0 12px;border-radius:10px;
  color:var(--text-on-dark-2);font-size:15px;
  transition:background .18s var(--ease),color .18s var(--ease);
}
.nav-link svg{width:18px;height:18px;flex:0 0 auto;fill:currentColor;opacity:.85}
.nav-link:hover{background:rgba(255,255,255,.06);color:var(--text-on-dark)}
.nav-link.active{background:rgba(33,212,196,.10);color:var(--primary)}
.nav-link.active::before{
  content:"";position:absolute;left:-16px;top:9px;bottom:9px;width:3px;
  background:var(--primary);border-radius:0 3px 3px 0;
}

.sidebar-foot{
  flex:0 0 auto;margin-top:auto;padding-top:18px;
  border-top:1px solid var(--line-dark);
  display:flex;flex-direction:column;gap:14px;
}
.sidebar-foot .btn{width:100%}
.sidebar-note{font-size:12px;line-height:1.6;color:var(--text-on-dark-2);opacity:.75}
.sidebar-note strong{display:block;font-weight:500;color:var(--text-on-dark-2)}

.main{margin-left:0;padding-top:56px;min-height:100vh}
.container{max-width:1240px;margin:0 auto;padding:0 20px}

/* ============ 通用按钮 / 标签 ============ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:48px;padding:0 24px;border-radius:var(--r-btn);
  font-size:15px;font-weight:600;border:1px solid transparent;
  cursor:pointer;white-space:nowrap;
  transition:filter .18s var(--ease),background .18s var(--ease),border-color .18s var(--ease),transform .12s var(--ease),color .18s var(--ease);
}
.btn:active{transform:translateY(1px)}
.btn:hover{filter:brightness(1.06)}
.btn-sm{height:40px;padding:0 18px;font-size:14px}
.btn-lg{height:52px;padding:0 30px;font-size:16px}
.btn-block{width:100%}
.btn-primary{background:var(--primary);color:var(--ink-900)}
.btn-accent{background:var(--accent);color:#fff}
.btn-accent:hover{filter:brightness(1.05)}
.btn-ghost-dark{background:transparent;border-color:rgba(255,255,255,.24);color:var(--text-on-dark)}
.btn-ghost-dark:hover{background:rgba(255,255,255,.08);border-color:rgba(255,255,255,.4);filter:none}
.btn-ghost-light{background:#fff;border-color:var(--line-light);color:var(--text-on-light)}
.btn-ghost-light:hover{border-color:var(--primary-deep);color:var(--primary-deep);filter:none}
.btn[disabled]{opacity:.45;cursor:not-allowed}

.text-link{
  display:inline-flex;align-items:center;gap:6px;
  font-size:14px;font-weight:600;color:var(--primary-deep);
  transition:gap .18s var(--ease),color .18s var(--ease);
}
.text-link::after{content:"→";font-size:14px;transition:transform .18s var(--ease)}
.text-link:hover{gap:10px}
.text-link--dark{color:var(--primary)}
.text-link--dark:hover{color:#5CF0E2}

.badge{
  display:inline-flex;align-items:center;height:24px;padding:0 10px;
  border-radius:var(--r-pill);font-size:12px;font-weight:600;line-height:1;
  background:var(--sand-200);color:var(--text-on-light-2);
}
.badge--primary{background:rgba(33,212,196,.16);color:#0C7C74}
.badge--dark{background:rgba(255,255,255,.08);color:var(--text-on-dark)}
.badge--accent{background:rgba(255,61,124,.14);color:var(--accent-deep)}

/* ============ 板块基础 ============ */
.section{padding:60px 0}
.section--light{background:var(--sand-050);color:var(--text-on-light)}
.section--alt{background:var(--sand-100);color:var(--text-on-light)}
.section--dark{background:var(--ink-800);color:var(--text-on-dark)}
.section--deep{background:var(--ink-900);color:var(--text-on-dark)}

.section-head{max-width:720px;margin-bottom:40px}
.section-head h2{
  font-size:clamp(26px,3.4vw,40px);line-height:1.25;font-weight:800;letter-spacing:0;
}
.section-head p{margin-top:14px;font-size:16px;color:var(--text-on-light-2);line-height:1.85}
.section--dark .section-head p,.section--deep .section-head p{color:var(--text-on-dark-2)}

.section-head--row{
  display:flex;align-items:flex-end;justify-content:space-between;gap:24px;
  max-width:none;
}

/* ============ Hero ============ */
.hero{
  position:relative;overflow:hidden;background:var(--ink-900);color:var(--text-on-dark);
}
.hero-bg{
  position:absolute;inset:0;
  background-image:url(/assets/images/backpic/back-1.webp);
  background-size:cover;background-position:center;
}
.hero-bg::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(90deg,rgba(11,12,21,.97) 0%,rgba(11,12,21,.9) 42%,rgba(11,12,21,.45) 100%);
}
.hero-stars{
  position:absolute;inset:0;pointer-events:none;opacity:.18;
  background-image:
    radial-gradient(1.5px 1.5px at 12% 22%,#fff,transparent 60%),
    radial-gradient(1px 1px at 30% 64%,#fff,transparent 60%),
    radial-gradient(1.5px 1.5px at 56% 16%,#fff,transparent 60%),
    radial-gradient(1px 1px at 76% 46%,#fff,transparent 60%),
    radial-gradient(1.5px 1.5px at 88% 74%,#fff,transparent 60%),
    radial-gradient(1px 1px at 44% 88%,#fff,transparent 60%),
    radial-gradient(1px 1px at 66% 84%,#fff,transparent 60%);
}
.hero-inner{
  position:relative;
  display:grid;grid-template-columns:1fr;gap:44px;
  padding:64px 0 68px;
}
.hero-eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  height:28px;padding:0 14px;border-radius:var(--r-pill);
  background:rgba(33,212,196,.12);color:var(--primary);
  font-size:13px;font-weight:600;margin-bottom:22px;
}
.hero-eyebrow::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--primary)}
.hero h1{
  font-size:clamp(34px,5vw,58px);line-height:1.15;font-weight:800;
  letter-spacing:0;margin-bottom:22px;
}
.hero h1 em{font-style:normal;color:var(--primary)}
.hero-sub{
  font-size:17px;line-height:1.85;color:var(--text-on-dark-2);
  max-width:34em;margin-bottom:34px;
}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px}
.hero-stats{
  display:grid;grid-template-columns:repeat(2,1fr);gap:22px 24px;
  margin-top:44px;padding-top:26px;border-top:1px solid var(--line-dark);
}
.stat-num{
  font-family:var(--font-num);font-variant-numeric:tabular-nums;
  font-size:26px;font-weight:700;color:var(--primary);line-height:1.2;
}
.stat-num small{font-size:14px;font-weight:600;margin-left:2px}
.stat-label{font-size:13px;line-height:1.6;color:var(--text-on-dark-2);margin-top:4px}
.hero-visual{position:relative}
.hero-visual img{
  width:100%;border-radius:var(--r-card);
  border:1px solid rgba(255,255,255,.14);
  box-shadow:0 30px 60px rgba(0,0,0,.5);
  transform:rotate(-2deg);
  background:var(--ink-700);
}
.hero-visual::after{
  content:"";position:absolute;inset:auto 8% -22px 8%;height:40px;
  background:radial-gradient(ellipse at center,rgba(33,212,196,.28),transparent 70%);
  filter:blur(10px);pointer-events:none;
}

/* ============ 价值主张 ============ */
.value-layout{display:grid;grid-template-columns:1fr;gap:36px}
.value-heading h2{font-size:clamp(26px,3.2vw,38px);line-height:1.25;font-weight:800}
.value-heading p{margin-top:14px;color:var(--text-on-light-2);font-size:15px;line-height:1.85}
.value-grid{display:grid;grid-template-columns:1fr;gap:0;border-top:1px solid var(--line-light)}
.value-item{
  padding:26px 0 26px 22px;border-bottom:1px solid var(--line-light);
  position:relative;
}
.value-item::before{
  content:"";position:absolute;left:0;top:32px;width:4px;height:22px;border-radius:2px;background:var(--primary);
}
.value-num{
  font-family:var(--font-num);font-size:13px;font-weight:700;color:var(--primary-deep);
  letter-spacing:.06em;display:block;margin-bottom:8px;
}
.value-item h3{font-size:18px;font-weight:700;line-height:1.4;margin-bottom:8px}
.value-item p{font-size:14.5px;line-height:1.8;color:var(--text-on-light-2)}

/* ============ 功能分组 Tab ============ */
.tabs{margin-top:8px}
.tab-list{
  display:flex;gap:10px;overflow-x:auto;padding-bottom:6px;
  scrollbar-width:none;-ms-overflow-style:none;
  border-bottom:1px solid var(--line-light);
}
.tab-list::-webkit-scrollbar{display:none}
.tab-btn{
  flex:0 0 auto;height:44px;padding:0 20px;border-radius:var(--r-pill);
  border:1px solid var(--line-light);background:#fff;color:var(--text-on-light-2);
  font-size:15px;font-weight:600;cursor:pointer;
  transition:all .18s var(--ease);
}
.tab-btn:hover{border-color:var(--primary-deep);color:var(--primary-deep)}
.tab-btn.active{background:var(--ink-900);border-color:var(--ink-900);color:var(--primary)}
.tab-panel{display:none;padding-top:36px}
.tab-panel.active{display:block;animation:fadeUp .3s var(--ease)}
@keyframes fadeUp{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
.feature-grid{display:grid;grid-template-columns:1fr;gap:0}
.feature-item{
  padding:22px 0 22px 20px;border-bottom:1px solid var(--line-light);
  border-left:4px solid rgba(33,212,196,.35);
  transition:border-color .18s var(--ease),background .18s var(--ease);
}
.feature-item:hover{border-left-color:var(--primary);background:rgba(33,212,196,.035)}
.feature-item h3{font-size:17px;font-weight:600;margin-bottom:6px}
.feature-item p{font-size:14.5px;color:var(--text-on-light-2);line-height:1.75}

/* ============ 使用场景 ============ */
.scene{
  display:grid;grid-template-columns:1fr;gap:26px;
  padding:34px 0;border-bottom:1px solid var(--line-dark);
}
.scene:first-of-type{padding-top:0}
.scene:last-of-type{border-bottom:0;padding-bottom:0}
.scene-media img{
  width:100%;aspect-ratio:4/3;object-fit:cover;
  border-radius:var(--r-img);border:1px solid var(--line-dark);
  background:var(--ink-700);
}
.scene-media--wide img{aspect-ratio:16/9}
.scene-text h3{font-size:20px;font-weight:700;line-height:1.45;margin-bottom:12px}
.scene-text p{font-size:15px;line-height:1.85;color:var(--text-on-dark-2);margin-bottom:16px}

/* ============ 案例 / 数据 ============ */
.metric-bar{
  display:grid;grid-template-columns:repeat(2,1fr);gap:24px 20px;
  padding:26px 0 34px;border-bottom:1px solid var(--line-light);margin-bottom:36px;
}
.metric-num{
  font-family:var(--font-num);font-variant-numeric:tabular-nums;
  font-size:clamp(26px,3.4vw,36px);font-weight:700;color:var(--primary-deep);line-height:1.15;
}
.metric-label{font-size:13px;color:var(--text-on-light-2);margin-top:6px;line-height:1.6}

.case-grid{display:grid;grid-template-columns:1fr;gap:22px}
.case-card{
  background:#fff;border:1px solid var(--line-light);border-radius:var(--r-card);
  overflow:hidden;display:flex;flex-direction:column;
  transition:transform .18s var(--ease),box-shadow .18s var(--ease),border-color .18s var(--ease);
}
.case-card:hover{transform:translateY(-2px);box-shadow:var(--sh-light);border-color:rgba(15,158,147,.4)}
.case-thumb{aspect-ratio:16/9;overflow:hidden;background:var(--sand-200)}
.case-thumb img{width:100%;height:100%;object-fit:cover;transition:object-position .3s var(--ease)}
.case-body{padding:20px 20px 22px;display:flex;flex-direction:column;gap:10px;flex:1}
.case-body h3{font-size:17px;font-weight:700;line-height:1.5}
.case-body p{font-size:14px;color:var(--text-on-light-2);line-height:1.75}
.case-body .text-link{margin-top:auto}

/* ============ 价格 ============ */
.price-grid{display:grid;grid-template-columns:1fr;gap:22px;align-items:start}
.price-card{
  position:relative;
  background:var(--ink-700);border:1px solid var(--line-dark);border-radius:var(--r-card);
  padding:30px 26px 28px;display:flex;flex-direction:column;gap:18px;
  box-shadow:var(--sh-dark);
  transition:transform .18s var(--ease),border-color .18s var(--ease);
}
.price-card:hover{border-color:rgba(33,212,196,.4)}
.price-card h3{font-size:18px;font-weight:700}
.price-card .price-amount{
  font-family:var(--font-num);font-variant-numeric:tabular-nums;
  font-size:38px;font-weight:700;line-height:1.1;color:var(--text-on-dark);
}
.price-card .price-amount small{font-size:14px;font-weight:500;color:var(--text-on-dark-2);margin-left:6px}
.price-card .price-desc{font-size:13.5px;color:var(--text-on-dark-2);line-height:1.7;margin-top:-8px}
.price-list{display:flex;flex-direction:column;gap:10px}
.price-list li{
  display:flex;gap:10px;font-size:14.5px;line-height:1.7;color:var(--text-on-dark-2);
}
.price-list li::before{
  content:"";flex:0 0 auto;width:16px;height:16px;margin-top:5px;border-radius:50%;
  background:rgba(33,212,196,.16);
  background-image:linear-gradient(45deg,transparent 46%,var(--primary) 46%,var(--primary) 54%,transparent 54%),
                   linear-gradient(-45deg,transparent 46%,var(--primary) 46%,var(--primary) 54%,transparent 54%);
  background-size:8px 8px,8px 8px;background-position:center,center;background-repeat:no-repeat;
}
.price-card .btn{margin-top:auto}
.price-card--featured{
  background:var(--ink-600);
  border:1px solid var(--accent);
  box-shadow:0 0 0 1px rgba(255,61,124,.2),0 24px 54px rgba(0,0,0,.5);
}
.price-card--featured .price-tag{
  position:absolute;top:-13px;right:22px;
  height:26px;padding:0 12px;border-radius:var(--r-pill);
  background:var(--accent);color:#fff;font-size:12px;font-weight:700;
  display:flex;align-items:center;
}

/* ============ 资讯列表 ============ */
.news-grid{display:grid;grid-template-columns:1fr;gap:22px}
.news-card{
  background:#fff;border:1px solid var(--line-light);border-radius:var(--r-card);
  overflow:hidden;display:flex;flex-direction:column;
  transition:transform .18s var(--ease),box-shadow .18s var(--ease),border-color .18s var(--ease);
}
.news-card:hover{transform:translateY(-2px);box-shadow:var(--sh-light);border-color:rgba(15,158,147,.4)}
.news-card:hover .news-title{color:var(--primary-deep)}
.news-thumb{aspect-ratio:16/9;overflow:hidden;background:var(--sand-200)}
.news-thumb img{width:100%;height:100%;object-fit:cover}
.news-body{padding:18px 20px 20px;display:flex;flex-direction:column;gap:10px;flex:1}
.news-title{
  font-size:17px;font-weight:700;line-height:1.5;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
  transition:color .18s var(--ease);
}
.news-summary{
  font-size:14px;color:var(--text-on-light-2);line-height:1.75;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
}
.news-meta{
  margin-top:auto;padding-top:12px;border-top:1px solid var(--line-light);
  display:flex;align-items:center;flex-wrap:wrap;gap:10px;
  font-size:12.5px;color:var(--text-on-light-3);
}
.news-meta .dot{width:3px;height:3px;border-radius:50%;background:var(--sand-200)}

.empty-state{
  border:1px dashed var(--sand-200);border-radius:var(--r-card);
  padding:52px 24px;text-align:center;background:rgba(255,255,255,.5);
}
.empty-state p{font-size:15px;color:var(--text-on-light-2);margin-bottom:14px}

/* ============ FAQ ============ */
.faq-list{border-top:1px solid var(--line-light);max-width:900px}
.faq-item{border-bottom:1px solid var(--line-light)}
.faq-q{
  width:100%;min-height:64px;padding:16px 44px 16px 0;position:relative;
  background:transparent;border:0;text-align:left;cursor:pointer;
  font-size:17px;font-weight:600;line-height:1.6;color:var(--text-on-light);
  transition:color .18s var(--ease);
}
.faq-q:hover{color:var(--primary-deep)}
.faq-q::after{
  content:"";position:absolute;right:12px;top:50%;width:8px;height:8px;
  border-right:2px solid var(--text-on-light-3);border-bottom:2px solid var(--text-on-light-3);
  transform:translateY(-70%) rotate(45deg);
  transition:transform .2s var(--ease);
}
.faq-item.open .faq-q::after{transform:translateY(-20%) rotate(-135deg);border-color:var(--primary-deep)}
.faq-a{
  max-height:0;overflow:hidden;
  transition:max-height .26s var(--ease);
}
.faq-a-inner{
  padding:0 60px 22px 0;font-size:15px;line-height:1.85;color:var(--text-on-light-2);
}

/* ============ 底部 CTA ============ */
.cta-band{
  position:relative;overflow:hidden;
  background:var(--ink-900);color:var(--text-on-dark);
  border-top:1px solid var(--line-dark);
}
.cta-band::before{
  content:"";position:absolute;inset:0;opacity:.14;pointer-events:none;
  background-image:
    radial-gradient(1.5px 1.5px at 15% 30%,#fff,transparent 60%),
    radial-gradient(1px 1px at 40% 70%,#fff,transparent 60%),
    radial-gradient(1.5px 1.5px at 66% 24%,#fff,transparent 60%),
    radial-gradient(1px 1px at 84% 62%,#fff,transparent 60%);
}
.cta-inner{
  position:relative;display:flex;flex-direction:column;gap:24px;
  padding:56px 0;
}
.cta-inner h2{font-size:clamp(24px,3vw,32px);line-height:1.35;font-weight:800}
.cta-inner p{margin-top:10px;font-size:15px;color:var(--text-on-dark-2);line-height:1.8}
.cta-actions{display:flex;flex-wrap:wrap;gap:14px}

/* ============ 页脚 ============ */
.footer{background:var(--ink-900);color:var(--text-on-dark-2);border-top:1px solid var(--line-dark)}
.footer-grid{
  display:grid;grid-template-columns:1fr;gap:32px;
  padding:56px 0 40px;
}
.footer-brand .brand{height:auto;border:0;padding:0;margin-bottom:14px}
.footer-brand p{font-size:14px;line-height:1.85;color:var(--text-on-dark-2);max-width:36ch}
.footer h4{
  font-size:14px;font-weight:700;color:var(--text-on-dark);
  margin-bottom:16px;letter-spacing:.02em;
}
.footer-links{display:flex;flex-direction:column;gap:10px}
.footer-links a{
  font-size:14px;color:var(--text-on-dark-2);
  transition:color .18s var(--ease);
  width:fit-content;
}
.footer-links a:hover{color:var(--primary);text-decoration:underline;text-underline-offset:3px}
.footer-contact{display:flex;flex-direction:column;gap:10px;font-size:14px;line-height:1.7}
.footer-contact span{color:var(--text-on-dark-2)}
.footer-bottom{
  border-top:1px solid var(--line-dark);
  padding:20px 0 28px;
  display:flex;flex-wrap:wrap;gap:10px 24px;align-items:center;justify-content:space-between;
  font-size:13px;color:var(--text-on-dark-2);
}
.footer-bottom a:hover{color:var(--primary)}

/* ============ 状态 / 表单 ============ */
.field{display:flex;flex-direction:column;gap:8px}
.field label{font-size:14px;font-weight:500;color:var(--text-on-light-2)}
.field input{
  height:48px;padding:0 16px;border-radius:var(--r-btn);
  border:1px solid var(--line-light);background:#fff;font-size:15px;color:var(--text-on-light);
  transition:border-color .18s var(--ease),box-shadow .18s var(--ease);
}
.field input:focus{outline:none;border-color:var(--primary-deep);box-shadow:0 0 0 3px rgba(33,212,196,.18)}
.field input.error{border-color:var(--error)}
.field .err{font-size:13px;color:var(--error)}

/* ============ 响应式 ============ */
@media (min-width:480px){
  .hero-stats{grid-template-columns:repeat(4,1fr)}
  .scene{gap:30px}
}
@media (min-width:768px){
  .topbar{height:64px;padding:0 24px}
  .main{padding-top:64px}
  .container{padding:0 28px}
  .section{padding:80px 0}
  .hero-inner{padding:76px 0 80px;gap:52px}
  .metric-bar{grid-template-columns:repeat(4,1fr)}
  .case-grid{grid-template-columns:repeat(2,1fr)}
  .news-grid{grid-template-columns:repeat(2,1fr)}
  .value-grid{grid-template-columns:repeat(2,1fr);gap:0 40px}
  .feature-grid{grid-template-columns:repeat(2,1fr);gap:0 40px}
  .value-item{padding-right:8px}
  .footer-grid{grid-template-columns:repeat(2,1fr)}
  .cta-inner{flex-direction:row;align-items:center;justify-content:space-between;padding:64px 0}
  .cta-actions{flex:0 0 auto}
}
@media (min-width:1024px){
  :root{--sidebar-w:216px}
  .topbar{display:none}
  .sidebar{width:var(--sidebar-w);transform:none;padding:0 16px 22px}
  .backdrop{display:none}
  .main{margin-left:var(--sidebar-w);padding-top:0}
  .container{padding:0 40px}
  .section{padding:96px 0}
  .hero-inner{grid-template-columns:7fr 5fr;gap:56px;align-items:center;padding:88px 0 84px;min-height:600px}
  .hero-stats{grid-template-columns:repeat(4,1fr)}
  .value-layout{grid-template-columns:320px 1fr;gap:64px}
  .scene{grid-template-columns:5fr 7fr;gap:48px;align-items:center;padding:44px 0}
  .scene:nth-of-type(even) .scene-media{order:2}
  .scene:nth-of-type(even) .scene-text{order:1}
  .price-grid{grid-template-columns:repeat(3,1fr);gap:24px}
  .price-card--featured{transform:translateY(-8px)}
  .footer-grid{grid-template-columns:1.4fr 1fr 1fr 1.1fr;gap:32px}
}
@media (min-width:1100px){
  .news-grid{grid-template-columns:repeat(3,1fr)}
}
@media (min-width:1280px){
  :root{--sidebar-w:240px}
}
@media (min-width:1440px){
  :root{--sidebar-w:264px}
  .container{max-width:1320px}
}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.001ms !important;transition-duration:.001ms !important}
  html{scroll-behavior:auto}
  .case-card:hover,.news-card:hover,.price-card--featured{transform:none}
}

/* roulang page: article */
:root{
    --ink-900:#0B0C15;
    --ink-800:#121422;
    --ink-700:#1B1E33;
    --ink-600:#262A44;
    --sand-050:#FAF8F4;
    --sand-100:#F3F0E9;
    --sand-200:#E6E1D6;
    --line-dark:rgba(255,255,255,.10);
    --line-light:#E3DFD6;
    --primary:#21D4C4;
    --primary-deep:#0F9E93;
    --accent:#FF3D7C;
    --accent-deep:#E11D5F;
    --text-on-dark:#EDEEF6;
    --text-on-dark-2:#A8ADC4;
    --text-on-light:#14161F;
    --text-on-light-2:#5B6072;
    --text-on-light-3:#8A8F9F;
    --ok:#2BB673;
    --warn:#E8A33D;
    --error:#E05353;
    --info:#4C8BFF;
    --radius-card:16px;
    --radius-img:14px;
    --radius-btn:10px;
    --shadow-dark:0 0 0 1px rgba(255,255,255,.06), 0 18px 44px rgba(0,0,0,.45);
    --shadow-light:0 1px 2px rgba(16,18,32,.04), 0 12px 28px rgba(16,18,32,.07);
    --sidebar-w:240px;
    --ease:cubic-bezier(.2,.7,.3,1);
    --font-sans:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Noto Sans SC","Hiragino Sans GB",sans-serif;
    --font-mono:"Space Grotesk",Inter,ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}
@media (min-width:1440px){:root{--sidebar-w:264px}}
@media (max-width:1279px){:root{--sidebar-w:216px}}

*,*::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:1.8;
    color:var(--text-on-light);
    background:var(--sand-050);
    letter-spacing:0;
}
img{max-width:100%;display:block;height:auto}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
ul,ol{margin:0;padding:0;list-style:none}
h1,h2,h3,h4{margin:0;font-weight:700;letter-spacing:0;line-height:1.3}
p{margin:0}
:focus-visible{outline:2px solid var(--primary);outline-offset:2px;border-radius:4px}

.container{width:100%;max-width:1240px;margin:0 auto;padding:0 40px}

/* ---------- 侧边栏 App Shell ---------- */
.sidebar{
    position:fixed;
    top:0;left:0;bottom:0;
    width:var(--sidebar-w);
    background:var(--ink-900);
    color:var(--text-on-dark);
    border-right:1px solid var(--line-dark);
    display:flex;
    flex-direction:column;
    padding:0 16px 20px;
    z-index:60;
    overflow-y:auto;
    transition:transform .24s var(--ease);
}
.brand{display:inline-flex;align-items:center;gap:10px;font-weight:700;color:inherit}
.sidebar .brand{height:72px;font-size:18px;flex:0 0 auto}
.brand-mark{
    width:30px;height:30px;border-radius:9px;
    display:grid;place-items:center;
    background:linear-gradient(140deg,rgba(33,212,196,.24),rgba(255,61,124,.18));
    color:var(--primary);
    flex:0 0 auto;
}
.brand-mark svg{width:18px;height:18px;fill:currentColor}
.brand-mark--mini{width:26px;height:26px;border-radius:8px}
.brand-mark--mini svg{width:15px;height:15px}
.side-nav{display:flex;flex-direction:column;gap:4px;margin-top:10px}
.side-nav a{
    position:relative;
    display:flex;align-items:center;
    height:44px;padding:0 12px;
    border-radius:10px;
    font-size:15px;
    color:var(--text-on-dark-2);
    transition:background .18s var(--ease),color .18s var(--ease);
}
.side-nav a:hover{background:rgba(255,255,255,.06);color:var(--text-on-dark)}
.side-nav a.is-active{background:rgba(33,212,196,.10);color:var(--primary)}
.side-nav a.is-active::before{
    content:"";position:absolute;left:-16px;top:8px;bottom:8px;width:3px;
    border-radius:0 3px 3px 0;background:var(--primary);
}
.side-foot{margin-top:auto;padding-top:24px;border-top:1px solid var(--line-dark)}
.side-foot .btn{width:100%}
.side-copy{margin-top:14px;font-size:12.5px;line-height:1.7;color:#767c92}

/* ---------- 顶部栏（移动/平板） ---------- */
.topbar{
    position:fixed;top:0;left:0;right:0;
    height:56px;
    display:none;align-items:center;gap:12px;
    padding:0 16px;
    background:rgba(11,12,21,.95);
    border-bottom:1px solid var(--line-dark);
    color:var(--text-on-dark);
    z-index:70;
}
.menu-btn{
    width:40px;height:40px;border-radius:10px;
    display:grid;place-items:center;
    background:rgba(255,255,255,.06);
    transition:background .18s var(--ease);
}
.menu-btn:hover{background:rgba(255,255,255,.12)}
.menu-btn span{position:relative;display:block;width:18px;height:2px;border-radius:2px;background:var(--text-on-dark)}
.menu-btn span::before,.menu-btn span::after{
    content:"";position:absolute;left:0;width:18px;height:2px;border-radius:2px;background:var(--text-on-dark);
    transition:transform .2s var(--ease);
}
.menu-btn span::before{top:-6px}
.menu-btn span::after{top:6px}
.brand-mini{display:inline-flex;align-items:center;gap:8px;font-size:16px;font-weight:700;color:var(--text-on-dark)}
.scrim{
    position:fixed;inset:0;background:rgba(11,12,21,.62);
    opacity:0;visibility:hidden;transition:opacity .2s var(--ease);z-index:55;
}
.scrim.show{opacity:1;visibility:visible}

/* ---------- 主内容 ---------- */
.main{margin-left:var(--sidebar-w);min-height:100vh;display:flex;flex-direction:column;background:var(--sand-050)}

/* ---------- 面包屑带 ---------- */
.page-strip{background:var(--ink-900);border-bottom:1px solid var(--line-dark);color:var(--text-on-dark-2);font-size:13.5px}
.page-strip .container{display:flex;align-items:center;gap:8px;height:48px;overflow:hidden;white-space:nowrap}
.page-strip a{color:var(--text-on-dark-2);transition:color .18s var(--ease)}
.page-strip a:hover{color:var(--primary)}
.page-strip .sep{color:rgba(255,255,255,.28)}
.page-strip .current{color:var(--text-on-dark);overflow:hidden;text-overflow:ellipsis;max-width:52ch}

/* ---------- 文章头 ---------- */
.article-hero{
    position:relative;
    background:var(--ink-800) url('/assets/images/backpic/back-2.webp') center/cover no-repeat;
    color:var(--text-on-dark);
    padding:64px 0 56px;
    overflow:hidden;
}
.article-hero::after{
    content:"";position:absolute;inset:0;
    background:linear-gradient(90deg,rgba(11,12,21,.95) 0%,rgba(11,12,21,.84) 46%,rgba(11,12,21,.48) 100%);
}
.article-hero .container{position:relative;z-index:2;max-width:880px;margin-left:auto;margin-right:auto}
.badge{
    display:inline-flex;align-items:center;gap:6px;
    height:24px;padding:0 12px;border-radius:999px;
    font-size:12px;line-height:1;
    background:rgba(255,255,255,.08);color:var(--text-on-dark);
}
.badge--primary{background:rgba(33,212,196,.16);color:var(--primary)}
.article-hero h1{
    font-size:clamp(28px,3.6vw,42px);
    line-height:1.24;
    font-weight:800;
    margin:18px 0 20px;
    max-width:24ch;
}
.article-meta{
    display:flex;flex-wrap:wrap;align-items:center;gap:0;
    font-size:14px;color:var(--text-on-dark-2);
}
.article-meta span{display:inline-flex;align-items:center}
.article-meta span+span::before{
    content:"";display:inline-block;width:1px;height:12px;margin:0 12px;
    background:rgba(255,255,255,.22);
}

/* ---------- 正文区 ---------- */
.article-main{background:var(--sand-050);padding:56px 0 80px;flex:1 1 auto}
.article-layout{display:grid;grid-template-columns:minmax(0,1fr);gap:40px;max-width:1000px;margin:0 auto}
@media (min-width:1280px){
    .article-layout{grid-template-columns:minmax(0,760px) 200px;align-items:start}
}
.article-card{
    background:#fff;
    border:1px solid var(--line-light);
    border-radius:var(--radius-card);
    box-shadow:var(--shadow-light);
    padding:48px;
}
.article-body{font-size:17px;line-height:1.9;color:var(--text-on-light)}
.article-body p{margin:0 0 20px}
.article-body h2{
    position:relative;
    font-size:24px;line-height:1.4;
    margin:40px 0 16px;padding-left:14px;
}
.article-body h2::before{
    content:"";position:absolute;left:0;top:6px;bottom:6px;width:4px;border-radius:2px;background:var(--primary-deep);
}
.article-body h3{font-size:19px;line-height:1.5;margin:28px 0 12px}
.article-body h2:first-child,.article-body h3:first-child{margin-top:0}
.article-body blockquote{
    margin:24px 0;padding:20px;
    border-left:3px solid var(--primary-deep);
    background:var(--sand-100);
    border-radius:0 12px 12px 0;
    color:var(--text-on-light-2);
}
.article-body blockquote p:last-child{margin-bottom:0}
.article-body ul{margin:0 0 20px}
.article-body ul li{position:relative;padding-left:20px;margin-bottom:10px}
.article-body ul li::before{
    content:"";position:absolute;left:2px;top:12px;width:5px;height:5px;border-radius:50%;background:var(--primary-deep);
}
.article-body ol{counter-reset:item;margin:0 0 20px}
.article-body ol li{position:relative;padding-left:32px;margin-bottom:10px}
.article-body ol li::before{
    counter-increment:item;
    content:counter(item,decimal-leading-zero);
    position:absolute;left:0;top:4px;
    font-family:var(--font-mono);font-size:13px;font-weight:700;color:var(--primary-deep);
    font-variant-numeric:tabular-nums;
}
.article-body a{color:var(--primary-deep);text-decoration:underline;text-underline-offset:3px}
.article-body a:hover{color:var(--accent-deep)}
.article-body img{border-radius:12px;margin:24px auto;width:100%}
.article-body figure{margin:24px 0}
.article-body figcaption{font-size:13px;color:var(--text-on-light-3);text-align:center;margin-top:10px}
.article-body code{
    background:var(--sand-100);border-radius:6px;padding:2px 6px;
    font-family:var(--font-mono);font-size:.92em;
}
.article-body table{
    width:100%;border-collapse:collapse;margin:24px 0;font-size:15px;
    border-top:2px solid var(--primary-deep);
}
.article-body th,.article-body td{padding:12px 14px;border-bottom:1px solid var(--line-light);text-align:left}
.article-body th{font-weight:600;background:var(--sand-050)}
.article-body tbody tr:nth-child(even){background:var(--sand-100)}

/* ---------- 目录 ---------- */
.toc{position:sticky;top:32px;display:none;font-size:14px}
@media (min-width:1280px){.toc{display:block}}
.toc-title{font-size:13px;color:var(--text-on-light-3);margin-bottom:14px}
.toc-list a{
    display:block;padding:8px 0 8px 12px;
    border-left:2px solid var(--line-light);
    color:var(--text-on-light-2);font-size:14px;line-height:1.5;
    transition:color .18s var(--ease),border-color .18s var(--ease);
}
.toc-list a.lv3{padding-left:24px;font-size:13px;color:var(--text-on-light-3)}
.toc-list a:hover{color:var(--primary-deep)}
.toc-list a.active{color:var(--primary-deep);border-left-color:var(--primary-deep);font-weight:600}
.toc-inline{
    border:1px solid var(--line-light);
    border-radius:12px;
    background:var(--sand-100);
    padding:14px 16px;
    margin-bottom:28px;
    font-size:14px;
}
.toc-inline summary{cursor:pointer;font-weight:600;color:var(--text-on-light-2);list-style:none}
.toc-inline summary::-webkit-details-marker{display:none}
.toc-inline summary::after{content:"＋";float:right;color:var(--primary-deep);font-weight:700}
.toc-inline[open] summary::after{content:"－"}
.toc-inline-list{margin-top:12px;display:flex;flex-direction:column;gap:8px}
.toc-inline-list a{color:var(--text-on-light-2);font-size:13.5px}
.toc-inline-list a:hover{color:var(--primary-deep)}
@media (min-width:1280px){.toc-inline{display:none}}

/* ---------- 标签与操作 ---------- */
.tag-list{display:flex;flex-wrap:wrap;gap:10px;margin-top:40px;padding-top:28px;border-top:1px solid var(--line-light)}
.tag{
    display:inline-flex;align-items:center;height:30px;padding:0 14px;
    border-radius:999px;background:var(--sand-100);border:1px solid var(--line-light);
    font-size:13px;color:var(--text-on-light-2);
    transition:border-color .18s var(--ease),color .18s var(--ease);
}
.tag:hover{border-color:var(--primary-deep);color:var(--primary-deep)}
.article-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}

/* ---------- 按钮 ---------- */
.btn{
    display:inline-flex;align-items:center;justify-content:center;gap:8px;
    height:44px;padding:0 22px;border-radius:var(--radius-btn);
    font-size:15px;font-weight:600;line-height:1;
    transition:background .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease),filter .18s var(--ease),transform .18s var(--ease);
}
.btn:active{transform:translateY(1px)}
.btn-primary{background:var(--primary);color:var(--ink-900)}
.btn-primary:hover{filter:brightness(1.06)}
.btn-accent{background:var(--accent);color:#fff}
.btn-accent:hover{filter:brightness(1.05)}
.btn-ghost{border:1.5px solid var(--line-light);color:var(--text-on-light)}
.btn-ghost:hover{border-color:var(--primary-deep);color:var(--primary-deep)}
.btn-ghost-dark{border:1.5px solid var(--line-dark);color:var(--text-on-dark)}
.btn-ghost-dark:hover{border-color:var(--primary);color:var(--primary)}
.btn-text{
    display:inline-flex;align-items:center;gap:6px;
    font-size:14px;font-weight:600;color:var(--primary-deep);
}
.btn-text::after{content:"→";transition:transform .18s var(--ease)}
.btn-text:hover::after{transform:translateX(2px)}
.btn-text:hover{text-decoration:underline;text-underline-offset:3px}
.btn-sm{height:36px;padding:0 16px;font-size:14px}

/* ---------- 空态 ---------- */
.empty-state{
    border:1px dashed var(--line-light);
    border-radius:var(--radius-card);
    background:var(--sand-100);
    padding:56px 24px;
    text-align:center;
}
.empty-state strong{display:block;font-size:19px;margin-bottom:10px}
.empty-state p{color:var(--text-on-light-2);font-size:15px;margin-bottom:20px}

/* ---------- 卡片 ---------- */
.card{
    display:flex;flex-direction:column;
    background:#fff;border:1px solid var(--line-light);
    border-radius:var(--radius-card);overflow:hidden;
    transition:transform .2s var(--ease),box-shadow .2s var(--ease),border-color .2s var(--ease);
}
.card:hover{transform:translateY(-2px);box-shadow:var(--shadow-light);border-color:#d6d1c4}
.card-thumb{aspect-ratio:16/9;background:var(--sand-200);overflow:hidden}
.card-thumb img{width:100%;height:100%;object-fit:cover}
.card-body{padding:22px;display:flex;flex-direction:column;gap:12px;flex:1 1 auto}
.card-body h3{font-size:17px;line-height:1.5;transition:color .18s var(--ease)}
.card:hover .card-body h3{color:var(--primary-deep)}
.card-body p{font-size:14.5px;line-height:1.75;color:var(--text-on-light-2);
    display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.card-meta{display:flex;align-items:center;gap:10px;font-size:13px;color:var(--text-on-light-3);margin-top:auto}
.card-link{font-size:14px;font-weight:600;color:var(--primary-deep)}
.card-link:hover{text-decoration:underline;text-underline-offset:3px}

/* ---------- 相关推荐 ---------- */
.related{background:var(--sand-100);padding:72px 0}
.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;margin-bottom:32px}
.section-head h2{font-size:clamp(22px,2.4vw,28px)}
.section-head p{font-size:14.5px;color:var(--text-on-light-2);margin-top:8px}
.card-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}

/* ---------- 底部 CTA ---------- */
.cta-band{
    position:relative;overflow:hidden;
    background:var(--ink-900);color:var(--text-on-dark);
    padding:56px 0;border-top:1px solid var(--line-dark);
}
.cta-band::before{
    content:"";position:absolute;inset:0;pointer-events:none;
    background-image:radial-gradient(rgba(255,255,255,.14) 1px,transparent 1px);
    background-size:34px 34px;opacity:.32;
}
.cta-inner{position:relative;z-index:2;display:flex;align-items:center;justify-content:space-between;gap:28px;flex-wrap:wrap}
.cta-inner h2{font-size:clamp(22px,2.6vw,30px);max-width:22ch}
.cta-inner p{margin-top:10px;font-size:15px;color:var(--text-on-dark-2);max-width:46ch}
.cta-actions{display:flex;gap:12px;flex-wrap:wrap}

/* ---------- 页脚 ---------- */
.footer{background:var(--ink-900);color:var(--text-on-dark-2);padding:64px 0 28px;border-top:1px solid var(--line-dark)}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.2fr;gap:32px}
.footer .brand{font-size:17px;color:var(--text-on-dark)}
.footer-brand p{margin-top:16px;font-size:14px;line-height:1.9;max-width:34ch;color:var(--text-on-dark-2)}
.footer h4{font-size:15px;color:var(--text-on-dark);margin-bottom:16px}
.footer-links{display:flex;flex-direction:column;gap:10px}
.footer-links a{font-size:14px;color:var(--text-on-dark-2);transition:color .18s var(--ease)}
.footer-links a:hover{color:var(--primary);text-decoration:underline;text-underline-offset:3px}
.footer-contact{display:flex;flex-direction:column;gap:10px;font-size:14px;line-height:1.75}
.footer-bottom{
    margin-top:44px;padding-top:20px;border-top:1px solid var(--line-dark);
    display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;
    font-size:13px;color:#787e94;
}

/* ---------- 响应式 ---------- */
@media (max-width:1279px){
    .card-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:1023px){
    :root{--sidebar-w:280px}
    .main{margin-left:0;padding-top:64px}
    .sidebar{transform:translateX(-100%);box-shadow:0 0 60px rgba(0,0,0,.55)}
    .sidebar.open{transform:none}
    .sidebar .brand{height:64px}
    .topbar{display:flex;height:64px}
    .container{padding:0 28px}
    .article-card{padding:36px}
    .related{padding:64px 0}
    .footer-grid{grid-template-columns:1fr 1fr;gap:28px}
    .cta-inner{flex-direction:column;align-items:flex-start}
}
@media (max-width:767px){
    :root{--sidebar-w:min(86vw,320px)}
    .main{padding-top:56px}
    .sidebar{padding:0 20px 24px}
    .side-nav a{height:48px}
    .container{padding:0 20px}
    .article-hero{padding:40px 0 36px}
    .article-hero .container{max-width:100%}
    .article-main{padding:36px 0 56px}
    .article-card{padding:20px;border-radius:14px}
    .article-body{font-size:15px;line-height:1.85}
    .article-body h2{font-size:21px;margin-top:32px}
    .article-body h3{font-size:18px}
    .card-grid{grid-template-columns:minmax(0,1fr);gap:16px}
    .section-head{flex-direction:column;align-items:flex-start}
    .related{padding:56px 0}
    .cta-band{padding:44px 0}
    .cta-actions{width:100%}
    .cta-actions .btn{flex:1 1 auto}
    .footer{padding:48px 0 24px}
    .footer-grid{grid-template-columns:1fr;gap:24px}
    .footer-bottom{flex-direction:column;gap:8px}
}
@media (max-width:479px){
    .btn{width:100%}
    .article-actions .btn{width:100%}
    .cta-actions{flex-direction:column}
}
@media (prefers-reduced-motion:reduce){
    *{transition-duration:.001ms !important;animation-duration:.001ms !important}
    html{scroll-behavior:auto}
}

/* roulang page: category1 */
:root{
  --ink-900:#0B0C15;
  --ink-800:#121422;
  --ink-700:#1B1E33;
  --ink-600:#262A44;
  --sand-050:#FAF8F4;
  --sand-100:#F3F0E9;
  --sand-200:#E6E1D6;
  --line-dark:rgba(255,255,255,.10);
  --line-light:#E3DFD6;
  --primary:#21D4C4;
  --primary-deep:#0F9E93;
  --accent:#FF3D7C;
  --accent-deep:#E11D5F;
  --text-on-dark:#EDEEF6;
  --text-on-dark-2:#A8ADC4;
  --text-on-light:#14161F;
  --text-on-light-2:#5B6072;
  --text-on-light-3:#8A8F9F;
  --ok:#2BB673;
  --warn:#E8A33D;
  --error:#E05353;
  --info:#4C8BFF;
  --r-card:16px;
  --r-img:14px;
  --r-btn:10px;
  --r-pill:999px;
  --shadow-light:0 1px 2px rgba(16,18,32,.04),0 12px 28px rgba(16,18,32,.07);
  --shadow-dark:0 0 0 1px rgba(255,255,255,.06),0 18px 44px rgba(0,0,0,.45);
  --ease:cubic-bezier(.2,.7,.3,1);
  --sidebar-w:240px;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  font-family:"PingFang SC","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  font-size:16px;
  line-height:1.8;
  color:var(--text-on-light);
  background:var(--sand-050);
}
img{max-width:100%;display:block;height:auto}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
h1,h2,h3,h4{margin:0;font-weight:700;line-height:1.25;letter-spacing:0}
p{margin:0}
ul,ol,dl,dd{margin:0;padding:0;list-style:none}
svg{display:block}
:focus-visible{outline:2px solid var(--primary);outline-offset:2px;border-radius:4px}
.num{font-variant-numeric:tabular-nums;font-feature-settings:"tnum"}

/* 侧栏 */
.sidebar{
  position:fixed;top:0;left:0;bottom:0;width:var(--sidebar-w);
  background:var(--ink-900);border-right:1px solid var(--line-dark);
  display:flex;flex-direction:column;
  padding:20px 16px 22px;z-index:70;overflow-y:auto;
  transition:transform .24s var(--ease);
}
.side-brand{display:flex;align-items:center;gap:10px;min-height:72px;padding:0 8px;color:var(--text-on-dark);font-size:18px;font-weight:700}
.brand-mark{
  width:30px;height:30px;flex:none;border-radius:9px;display:grid;place-items:center;
  background:linear-gradient(140deg,var(--primary),#12897f);
}
.brand-mark svg{width:18px;height:18px;fill:var(--ink-900)}
.side-nav{display:flex;flex-direction:column;gap:4px;margin-top:26px}
.side-label{font-size:12px;letter-spacing:.14em;color:var(--text-on-dark-2);opacity:.72;padding:0 12px 8px}
.side-link{
  position:relative;display:flex;align-items:center;gap:10px;height:44px;padding:0 12px;
  border-radius:10px;color:var(--text-on-dark-2);font-size:15px;
  transition:background .18s var(--ease),color .18s var(--ease);
}
.side-link svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:1.6;flex:none}
.side-link:hover{background:rgba(255,255,255,.06);color:var(--text-on-dark)}
.side-link.is-active{background:rgba(33,212,196,.10);color:var(--primary)}
.side-link.is-active::before{
  content:"";position:absolute;left:0;top:10px;bottom:10px;width:3px;border-radius:3px;background:var(--primary);
}
.side-foot{margin-top:auto;padding-top:22px;border-top:1px solid var(--line-dark);display:flex;flex-direction:column;gap:14px}
.side-foot p{font-size:12px;line-height:1.65;color:var(--text-on-dark-2);opacity:.78}

/* 顶部栏与抽屉 */
.topbar{
  display:none;position:fixed;top:0;left:0;right:0;height:64px;
  background:rgba(11,12,21,.94);backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line-dark);align-items:center;gap:12px;
  padding:0 18px;z-index:65;
}
.menu-btn{width:40px;height:40px;border-radius:10px;border:1px solid var(--line-dark);display:grid;place-items:center;transition:border-color .18s var(--ease)}
.menu-btn:hover{border-color:var(--primary)}
.menu-btn span{position:relative;display:block;width:16px;height:1.6px;background:var(--text-on-dark)}
.menu-btn span::before,.menu-btn span::after{content:"";position:absolute;left:0;width:16px;height:1.6px;background:var(--text-on-dark)}
.menu-btn span::before{top:-5px}
.menu-btn span::after{top:5px}
.brand-mini{display:flex;align-items:center;gap:8px;color:var(--text-on-dark);font-size:16px;font-weight:700}
.brand-mark--mini{width:26px;height:26px;border-radius:8px}
.brand-mark--mini svg{width:15px;height:15px;fill:var(--ink-900)}
.scrim{
  position:fixed;inset:0;background:rgba(11,12,21,.6);opacity:0;visibility:hidden;
  transition:opacity .2s var(--ease);z-index:66;
}
.scrim.is-open{opacity:1;visibility:visible}

/* 主内容 */
.main{margin-left:var(--sidebar-w);min-height:100vh;background:var(--sand-050)}
.container{width:100%;max-width:1240px;margin:0 auto;padding:0 40px}

/* 按钮 */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:44px;padding:0 22px;border-radius:var(--r-btn);
  font-size:15px;font-weight:600;white-space:nowrap;
  transition:transform .18s var(--ease),filter .18s var(--ease),background .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease);
}
.btn:active{transform:translateY(1px)}
.btn-primary{background:var(--primary);color:var(--ink-900)}
.btn-primary:hover{filter:brightness(1.06)}
.btn-accent{background:var(--accent);color:#fff}
.btn-accent:hover{filter:brightness(1.06)}
.btn-ghost{border:1.5px solid var(--line-dark);color:var(--text-on-dark)}
.btn-ghost:hover{border-color:var(--primary);color:var(--primary)}
.btn-outline{border:1.5px solid var(--line-light);color:var(--text-on-light)}
.btn-outline:hover{border-color:var(--primary-deep);color:var(--primary-deep)}
.btn-lg{height:48px;padding:0 26px}
.btn-sm{height:36px;padding:0 16px;font-size:14px}
.btn-block{width:100%}
.link-arrow{display:inline-flex;align-items:center;gap:6px;font-size:14px;font-weight:600;color:var(--primary-deep)}
.link-arrow svg{width:14px;height:14px;stroke:currentColor;fill:none;stroke-width:2;transition:transform .18s var(--ease)}
.link-arrow:hover{text-decoration:underline;text-underline-offset:3px}
.link-arrow:hover svg{transform:translateX(2px)}

/* 面包屑 */
.crumb-bar{background:var(--ink-800);border-bottom:1px solid var(--line-dark)}
.crumb{display:flex;align-items:center;gap:8px;height:40px;font-size:13px;color:var(--text-on-dark-2);overflow:hidden;white-space:nowrap}
.crumb a:hover{color:var(--primary)}
.crumb .sep{opacity:.45}
.crumb .cur{color:var(--text-on-dark);opacity:.92}

/* Hero */
.cat-hero{position:relative;overflow:hidden;background:var(--ink-900);color:var(--text-on-dark);padding:76px 0 80px}
.cat-hero::before{
  content:"";position:absolute;inset:0;
  background-image:linear-gradient(90deg,rgba(11,12,21,.97) 6%,rgba(11,12,21,.78) 50%,rgba(11,12,21,.46) 100%),url("/assets/images/backpic/back-2.webp");
  background-size:cover;background-position:center 34%;background-repeat:no-repeat;
}
.cat-hero::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:radial-gradient(1.5px 1.5px at 18% 26%,rgba(237,238,246,.16),transparent 60%),
                   radial-gradient(1.5px 1.5px at 62% 18%,rgba(33,212,196,.18),transparent 60%),
                   radial-gradient(1.5px 1.5px at 84% 62%,rgba(237,238,246,.13),transparent 60%),
                   radial-gradient(1.5px 1.5px at 36% 74%,rgba(255,61,124,.13),transparent 60%);
}
.cat-hero-inner{position:relative;z-index:2;max-width:740px}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:13px;letter-spacing:.08em;color:var(--primary);margin-bottom:18px}
.eyebrow::before{content:"";width:22px;height:1px;background:var(--primary);opacity:.7}
.cat-hero h1{font-size:clamp(32px,4.6vw,52px);line-height:1.16;font-weight:700}
.cat-hero p{color:var(--text-on-dark-2);font-size:17px;margin-top:20px;max-width:58ch}
.cat-hero-actions{display:flex;gap:14px;margin-top:34px;flex-wrap:wrap}

/* 通用板块 */
.section{padding:96px 0}
.section-alt{background:var(--sand-100)}
.section-head{max-width:720px;margin-bottom:44px}
.section-head h2{font-size:clamp(24px,3.1vw,36px)}
.section-head p{color:var(--text-on-light-2);margin-top:14px;font-size:16px}
.tag{display:inline-flex;align-items:center;height:24px;padding:0 12px;border-radius:var(--r-pill);font-size:12px;background:var(--sand-200);color:var(--text-on-light-2)}
.tag-primary{background:rgba(33,212,196,.16);color:var(--primary-deep)}

/* 简介区 */
.intro-grid{display:grid;grid-template-columns:3fr 2fr;gap:56px;align-items:start}
.intro-copy p{color:var(--text-on-light-2);font-size:16px;line-height:1.85;max-width:64ch}
.intro-copy p+p{margin-top:18px}
.point-card{background:#fff;border:1px solid var(--line-light);border-radius:var(--r-card);padding:26px 24px;box-shadow:var(--shadow-light)}
.point-card h3{font-size:16px;margin-bottom:18px}
.point-list{display:flex;flex-direction:column;gap:16px}
.point{display:flex;gap:12px;font-size:15px;color:var(--text-on-light-2);line-height:1.7}
.point svg{width:18px;height:18px;flex:none;margin-top:4px;fill:none;stroke:var(--primary-deep);stroke-width:2.2}

/* 图文交错 */
.zig{display:grid;grid-template-columns:1fr 1fr;gap:52px;align-items:center;padding:46px 0;border-bottom:1px solid var(--line-light)}
.zig:first-child{padding-top:0}
.zig:last-child{border-bottom:0;padding-bottom:0}
.zig.rev .zig-media{order:2}
.zig-media img{width:100%;object-fit:cover;border-radius:var(--r-img);box-shadow:var(--shadow-light)}
.zig-media--43 img{aspect-ratio:4/3}
.zig-media--169 img{aspect-ratio:16/9}
.zig-body h3{font-size:22px}
.zig-body p{color:var(--text-on-light-2);margin-top:14px;font-size:16px}
.zig-body .link-arrow{margin-top:18px}

/* 清单区块 */
.def-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 56px}
.def-row{
  display:grid;grid-template-columns:104px 1fr;gap:16px;
  padding:20px 12px;border-top:1px solid var(--line-light);
  transition:background .18s var(--ease);border-radius:6px;
}
.def-row:hover{background:rgba(33,212,196,.06)}
.def-row dt{font-size:17px;font-weight:600}
.def-row dd{font-size:15px;color:var(--text-on-light-2);line-height:1.75}

/* FAQ */
.faq{border-top:1px solid var(--line-light);margin-top:8px}
.faq-item{border-bottom:1px solid var(--line-light)}
.faq-q{
  width:100%;min-height:64px;display:flex;align-items:center;justify-content:space-between;gap:20px;
  text-align:left;font-size:17px;font-weight:600;padding:18px 0;
  transition:color .18s var(--ease);
}
.faq-q:hover{color:var(--primary-deep)}
.faq-q svg{width:18px;height:18px;flex:none;fill:none;stroke:currentColor;stroke-width:2;transition:transform .22s var(--ease)}
.faq-item.is-open .faq-q svg{transform:rotate(180deg)}
.faq-a{display:grid;grid-template-rows:0fr;transition:grid-template-rows .24s var(--ease)}
.faq-item.is-open .faq-a{grid-template-rows:1fr}
.faq-a-inner{overflow:hidden}
.faq-a p{padding:0 0 22px;color:var(--text-on-light-2);font-size:15px;line-height:1.85;max-width:66ch}

/* CTA */
.cta-band{position:relative;overflow:hidden;background:var(--ink-900);color:var(--text-on-dark);padding:58px 0}
.cta-band::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:radial-gradient(1.5px 1.5px at 12% 40%,rgba(237,238,246,.14),transparent 60%),
                   radial-gradient(1.5px 1.5px at 68% 28%,rgba(33,212,196,.16),transparent 60%),
                   radial-gradient(1.5px 1.5px at 88% 70%,rgba(255,61,124,.12),transparent 60%);
}
.cta-inner{position:relative;z-index:2;display:flex;align-items:center;justify-content:space-between;gap:36px}
.cta-inner h2{font-size:clamp(22px,2.6vw,30px)}
.cta-inner p{color:var(--text-on-dark-2);margin-top:12px;font-size:15px;max-width:52ch}
.cta-actions{display:flex;gap:14px;flex-wrap:wrap;flex:none}

/* 页脚 */
.footer{background:var(--ink-900);color:var(--text-on-dark);padding:72px 0 0;border-top:1px solid var(--line-dark)}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:32px}
.footer .brand{display:flex;align-items:center;gap:10px;font-size:17px;font-weight:700;color:var(--text-on-dark)}
.footer-brand p{font-size:14px;color:var(--text-on-dark-2);margin-top:16px;max-width:36ch;line-height:1.75}
.footer h4{font-size:15px;margin-bottom:16px;color:var(--text-on-dark)}
.footer-links{display:flex;flex-direction:column;gap:10px}
.footer-links a{font-size:14px;color:var(--text-on-dark-2);transition:color .18s var(--ease)}
.footer-links a:hover{color:var(--primary);text-decoration:underline;text-underline-offset:3px}
.footer-contact{display:flex;flex-direction:column;gap:10px;font-size:14px;color:var(--text-on-dark-2);line-height:1.7}
.footer-bottom{
  margin-top:56px;border-top:1px solid var(--line-dark);padding:20px 0 26px;
  display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;
  font-size:13px;color:var(--text-on-dark-2);
}

/* 断点 */
@media (min-width:1440px){
  :root{--sidebar-w:264px}
  .container{max-width:1320px}
}
@media (min-width:1024px) and (max-width:1279px){
  :root{--sidebar-w:216px}
}
@media (max-width:1023px){
  .topbar{display:flex}
  .sidebar{transform:translateX(-100%);width:min(86vw,320px);box-shadow:var(--shadow-dark)}
  .sidebar.is-open{transform:none}
  .main{margin-left:0;padding-top:64px}
  .side-link{height:48px}
  .intro-grid{grid-template-columns:1fr;gap:36px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px 24px}
}
@media (max-width:899px){
  .zig{grid-template-columns:1fr;gap:26px;padding:40px 0}
  .zig.rev .zig-media{order:0}
  .def-list{grid-template-columns:1fr;gap:0}
  .cta-inner{flex-direction:column;align-items:flex-start;gap:24px}
  .cta-actions{width:100%}
}
@media (max-width:767px){
  body{font-size:15px;line-height:1.85}
  .topbar{height:56px}
  .main{padding-top:56px}
  .container{padding:0 20px}
  .section{padding:60px 0}
  .cat-hero{padding:56px 0 60px}
  .cat-hero p{font-size:15.5px}
  .cat-hero-actions .btn{width:100%}
  .footer-grid{grid-template-columns:1fr;gap:30px}
  .footer{padding-top:56px}
  .footer-bottom{flex-direction:column;gap:8px}
  .def-row{grid-template-columns:88px 1fr;gap:12px;padding:18px 8px}
  .zig-body h3{font-size:20px}
}
@media (max-width:480px){
  .cat-hero h1{font-size:30px}
  .point-card{padding:22px 18px}
}
@media (prefers-reduced-motion:reduce){
  *{transition-duration:.01ms!important;animation-duration:.01ms!important;scroll-behavior:auto!important}
}

/* roulang page: category2 */
:root{
  --ink-900:#0B0C15;
  --ink-800:#121422;
  --ink-700:#1B1E33;
  --ink-600:#262A44;
  --sand-050:#FAF8F4;
  --sand-100:#F3F0E9;
  --sand-200:#E6E1D6;
  --line-dark:rgba(255,255,255,.10);
  --line-light:#E3DFD6;
  --primary:#21D4C4;
  --primary-deep:#0F9E93;
  --accent:#FF3D7C;
  --accent-deep:#E11D5F;
  --on-dark-1:#EDEEF6;
  --on-dark-2:#A8ADC4;
  --on-dark-3:#8A8F9F;
  --text-1:#14161F;
  --text-2:#5B6072;
  --text-3:#8A8F9F;
  --ok:#2BB673;
  --warn:#E8A33D;
  --error:#E05353;
  --info:#4C8BFF;
  --radius-card:16px;
  --radius-img:14px;
  --radius-btn:10px;
  --radius-pill:999px;
  --shadow-light:0 1px 2px rgba(16,18,32,.04), 0 12px 28px rgba(16,18,32,.07);
  --shadow-dark:0 0 0 1px rgba(255,255,255,.06), 0 18px 44px rgba(0,0,0,.45);
  --sidebar-w:240px;
  --font:"PingFang SC","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,"Helvetica Neue",sans-serif;
  --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);
  font-size:16px;
  line-height:1.8;
  color:var(--text-1);
  background:var(--sand-050);
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;height:auto}
a{color:inherit}
button{font-family:inherit}
h1,h2,h3,h4,p,ul,ol,figure{margin:0}
ul,ol{padding:0;list-style:none}
svg{display:block}
:focus-visible{outline:2px solid var(--primary);outline-offset:2px;border-radius:6px}

.skip-link{
  position:absolute;left:-9999px;top:0;z-index:200;background:var(--primary);color:var(--ink-900);
  padding:10px 16px;border-radius:0 0 10px 0;font-weight:600;text-decoration:none;
}
.skip-link:focus{left:0}

.container{max-width:1240px;margin:0 auto;padding:0 40px}

/* ---------- 左侧导航 ---------- */
.sidebar{
  position:fixed;top:0;left:0;bottom:0;width:var(--sidebar-w);
  background:var(--ink-900);
  border-right:1px solid var(--line-dark);
  display:flex;flex-direction:column;
  padding:0 16px 24px;
  z-index:90;
  transition:transform .24s cubic-bezier(.2,.7,.3,1);
}
.brand{
  display:flex;align-items:center;gap:10px;height:72px;padding:0 8px;
  color:var(--on-dark-1);font-size:18px;font-weight:700;letter-spacing:0;
  text-decoration:none;white-space:nowrap;
}
.brand-mark{
  width:28px;height:28px;border-radius:9px;flex:0 0 auto;
  background:linear-gradient(135deg,var(--primary),#0F9E93);
  display:grid;place-items:center;
}
.brand-mark svg{width:16px;height:16px;fill:var(--ink-900)}
.brand-mark--mini{width:24px;height:24px;border-radius:8px}
.brand-mark--mini svg{width:14px;height:14px}

.nav{display:flex;flex-direction:column;gap:4px;margin-top:10px}
.nav a{
  position:relative;display:flex;align-items:center;gap:10px;
  height:44px;padding:0 12px;border-radius:10px;
  color:var(--on-dark-2);font-size:15px;text-decoration:none;
  transition:background .18s ease,color .18s ease;
}
.nav .ico{width:18px;height:18px;flex:0 0 auto;opacity:.9}
.nav a:hover{background:rgba(255,255,255,.06);color:var(--on-dark-1)}
.nav a.is-active{background:rgba(33,212,196,.10);color:var(--primary);font-weight:600}
.nav a.is-active::before{
  content:"";position:absolute;left:0;top:10px;bottom:10px;width:3px;
  border-radius:2px;background:var(--primary);
}
.sidebar-foot{margin-top:auto;padding-top:20px;border-top:1px solid var(--line-dark)}
.sidebar-foot .btn{width:100%}
.sidebar-foot p{margin-top:12px;font-size:12.5px;line-height:1.6;color:var(--on-dark-3)}

.topbar{
  display:none;position:fixed;top:0;left:0;right:0;height:64px;
  align-items:center;gap:12px;padding:0 16px;
  background:var(--ink-900);border-bottom:1px solid var(--line-dark);
  z-index:95;
}
.brand-mini{
  display:flex;align-items:center;gap:9px;
  color:var(--on-dark-1);font-size:17px;font-weight:700;text-decoration:none;
}
.menu-btn{
  position:relative;width:40px;height:40px;flex:0 0 auto;
  border-radius:10px;border:1px solid var(--line-dark);
  background:rgba(255,255,255,.04);cursor:pointer;
  transition:background .18s ease,border-color .18s ease;
}
.menu-btn:hover{background:rgba(255,255,255,.09)}
.menu-btn span{position:absolute;left:50%;top:50%;width:18px;height:2px;border-radius:2px;background:var(--on-dark-1);transform:translate(-50%,-50%)}
.menu-btn span::before,.menu-btn span::after{content:"";position:absolute;left:0;width:18px;height:2px;border-radius:2px;background:var(--on-dark-1)}
.menu-btn span::before{top:-6px}
.menu-btn span::after{top:6px}

.overlay{position:fixed;inset:0;background:rgba(11,12,21,.6);z-index:85;border:0}

/* ---------- 主区域 ---------- */
.main,.footer{margin-left:var(--sidebar-w)}
.main{min-height:100vh}

.crumb-bar{
  height:40px;display:flex;align-items:center;
  background:var(--sand-100);border-bottom:1px solid var(--line-light);
}
.crumb{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--text-3);flex-wrap:wrap}
.crumb a{color:var(--text-2);text-decoration:none}
.crumb a:hover{color:var(--primary-deep);text-decoration:underline;text-underline-offset:3px}
.crumb .sep{color:var(--sand-200)}
.crumb .current{color:var(--text-1);font-weight:600}

.section{padding:96px 0}
.section--sand100{background:var(--sand-100)}
.section--sand050{background:var(--sand-050)}
.section-head{max-width:760px;margin-bottom:40px}
.section-head h2{font-size:clamp(26px,3.2vw,38px);line-height:1.25;font-weight:700;letter-spacing:0}
.section-head p{margin-top:14px;color:var(--text-2);font-size:16px}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-size:13px;font-weight:600;color:var(--primary-deep);letter-spacing:0;
  margin-bottom:14px;
}
.eyebrow::before{content:"";width:18px;height:1px;background:var(--primary-deep);opacity:.7}

/* ---------- Hero（亮区） ---------- */
.hero{
  position:relative;overflow:hidden;
  background:var(--sand-050);
  padding:76px 0 64px;
  border-bottom:1px solid var(--line-light);
}
.hero::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:radial-gradient(rgba(15,158,147,.18) 1px, transparent 1px);
  background-size:26px 26px;opacity:.45;
  -webkit-mask-image:linear-gradient(180deg,#000,transparent 72%);
  mask-image:linear-gradient(180deg,#000,transparent 72%);
}
.hero-grid{
  position:relative;display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);
  gap:56px;align-items:center;
}
.badge{
  display:inline-flex;align-items:center;height:24px;padding:0 12px;
  border-radius:var(--radius-pill);font-size:12px;font-weight:600;
  background:var(--sand-200);color:var(--text-2);
}
.badge--primary{background:rgba(33,212,196,.14);color:var(--primary-deep)}
.hero-copy .badge{margin-bottom:18px}
.hero h1{
  font-size:clamp(34px,4.6vw,54px);line-height:1.15;font-weight:800;letter-spacing:-.01em;
}
.hero-lead{
  margin-top:18px;max-width:560px;
  font-size:clamp(16px,1.6vw,18px);line-height:1.85;color:var(--text-2);
}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:30px}
.hero-meta{
  display:flex;flex-wrap:wrap;gap:8px 20px;margin-top:28px;
  font-size:13.5px;color:var(--text-3);
}
.hero-meta li{display:flex;align-items:center;gap:8px}
.hero-meta li::before{content:"";width:5px;height:5px;border-radius:50%;background:var(--primary-deep);opacity:.8}

.hero-media{position:relative}
.hero-media img{
  width:100%;aspect-ratio:4/3;object-fit:cover;
  border-radius:var(--radius-card);
  border:1px solid var(--line-light);
  box-shadow:var(--shadow-light);
  background:var(--sand-200);
}
.hero-tint{
  position:absolute;inset:0;border-radius:var(--radius-card);
  background:linear-gradient(200deg,rgba(33,212,196,.10),rgba(255,61,124,.05));
  pointer-events:none;
}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:44px;padding:0 22px;border-radius:var(--radius-btn);
  font-size:15px;font-weight:600;text-decoration:none;border:1px solid transparent;
  cursor:pointer;white-space:nowrap;
  transition:transform .18s cubic-bezier(.2,.7,.3,1),filter .18s ease,background .18s ease,color .18s ease,border-color .18s ease;
}
.btn:hover{transform:translateY(-1px);filter:brightness(1.06)}
.btn:active{transform:translateY(1px)}
.btn:disabled,.btn[aria-disabled="true"]{opacity:.45;cursor:not-allowed;transform:none}
.btn-primary{background:var(--accent);color:#fff}
.btn-primary:hover{background:var(--accent-deep)}
.btn-dark{background:var(--primary);color:var(--ink-900)}
.btn-ghost{background:transparent;border-color:var(--line-light);color:var(--text-1)}
.btn-ghost:hover{border-color:var(--primary-deep);color:var(--primary-deep)}
.btn-ghost-dark{background:transparent;border-color:var(--line-dark);color:var(--on-dark-1)}
.btn-ghost-dark:hover{border-color:var(--primary);color:var(--primary)}
.btn-sm{height:36px;padding:0 16px;font-size:14px}
.btn-lg{height:48px;padding:0 26px;font-size:16px}

.link-arrow{
  display:inline-flex;align-items:center;gap:6px;
  font-size:14px;font-weight:600;color:var(--primary-deep);text-decoration:none;
}
.link-arrow::after{content:"→";transition:transform .18s ease}
.link-arrow:hover{text-decoration:underline;text-underline-offset:3px}
.link-arrow:hover::after{transform:translateX(2px)}
.on-dark .link-arrow{color:var(--primary)}

/* ---------- 数据条 ---------- */
.stat-bar{
  display:grid;grid-template-columns:repeat(4,minmax(0,1fr));
  background:#fff;border:1px solid var(--line-light);
  border-radius:var(--radius-card);box-shadow:var(--shadow-light);overflow:hidden;
}
.stat{padding:30px 26px;border-left:1px solid var(--line-light)}
.stat:first-child{border-left:0}
.stat-num{
  font-family:var(--mono);font-size:clamp(28px,3vw,38px);line-height:1.1;
  font-weight:700;color:var(--primary-deep);font-variant-numeric:tabular-nums;letter-spacing:-.02em;
}
.stat-unit{font-size:15px;color:var(--text-2);margin-left:5px}
.stat p{margin-top:8px;font-size:13.5px;line-height:1.6;color:var(--text-3)}

/* ---------- 长列表 + 锚点 ---------- */
.list-grid{display:grid;grid-template-columns:220px minmax(0,1fr);gap:56px;align-items:start}
.anchor-list{position:sticky;top:36px}
.anchor-title{
  font-size:12.5px;font-weight:700;color:var(--text-3);
  letter-spacing:.06em;margin-bottom:12px;padding-left:12px;
}
.anchor-list a{
  display:block;padding:10px 12px;font-size:14.5px;color:var(--text-2);
  text-decoration:none;border-left:2px solid transparent;border-radius:0 8px 8px 0;
  transition:background .18s ease,color .18s ease,border-color .18s ease;
}
.anchor-list a:hover{background:var(--sand-100);color:var(--text-1)}
.anchor-list a.is-current{
  background:var(--sand-100);border-left-color:var(--primary-deep);
  color:var(--primary-deep);font-weight:600;
}
.anchor-bar{display:none}

.entries .section-head{margin-bottom:24px}
.entry{
  display:grid;grid-template-columns:64px minmax(0,1fr);gap:20px;
  padding:34px 0;border-top:1px solid var(--line-light);
  scroll-margin-top:90px;
}
.entry:first-of-type{border-top:0}
.entry-num{
  font-family:var(--mono);font-size:19px;font-weight:700;color:var(--text-3);
  font-variant-numeric:tabular-nums;padding-top:4px;
}
.entry h3{font-size:21px;line-height:1.4;font-weight:700;transition:color .18s ease}
.entry p{margin-top:10px;max-width:680px;font-size:15.5px;line-height:1.85;color:var(--text-2)}
.entry .link-arrow{margin-top:14px}
.entry:hover h3{color:var(--primary-deep)}

/* ---------- 适用场景 ---------- */
.scene-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px}
.scene{
  background:#fff;border:1px solid var(--line-light);border-radius:var(--radius-card);
  padding:30px;box-shadow:var(--shadow-light);
  transition:transform .2s cubic-bezier(.2,.7,.3,1),border-color .2s ease;
}
.scene:hover{transform:translateY(-2px);border-color:rgba(15,158,147,.4)}
.scene-ico{
  width:44px;height:44px;border-radius:12px;margin-bottom:18px;
  background:rgba(33,212,196,.12);color:var(--primary-deep);
  display:grid;place-items:center;
}
.scene-ico svg{width:22px;height:22px}
.scene h3{font-size:19px;font-weight:700}
.scene p{margin-top:10px;font-size:15px;line-height:1.8;color:var(--text-2)}

/* ---------- FAQ ---------- */
.faq{max-width:840px;border-top:1px solid var(--line-light)}
.faq-item{border-bottom:1px solid var(--line-light)}
.faq-q{
  width:100%;min-height:64px;display:flex;align-items:center;justify-content:space-between;
  gap:18px;padding:16px 0;background:none;border:0;cursor:pointer;text-align:left;
  font-size:17px;font-weight:600;color:var(--text-1);line-height:1.6;
  transition:color .18s ease;
}
.faq-q:hover{color:var(--primary-deep)}
.faq-q .caret{width:20px;height:20px;flex:0 0 auto;color:var(--primary-deep);transition:transform .2s ease}
.faq-item.is-open .faq-q .caret{transform:rotate(180deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .26s ease}
.faq-a p{padding:0 0 22px;max-width:720px;font-size:15.5px;line-height:1.85;color:var(--text-2)}
.faq-item.is-open .faq-a{max-height:280px}

/* ---------- 底部 CTA ---------- */
.cta-band{
  position:relative;overflow:hidden;
  background:var(--ink-900) url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
}
.cta-band::before{
  content:"";position:absolute;inset:0;
  background:linear-gradient(90deg,rgba(11,12,21,.95) 0%,rgba(11,12,21,.82) 55%,rgba(11,12,21,.68) 100%);
}
.cta-inner{
  position:relative;display:flex;align-items:center;justify-content:space-between;
  gap:32px;padding:66px 0;flex-wrap:wrap;
}
.cta-inner h2{font-size:clamp(23px,2.6vw,32px);line-height:1.3;color:var(--on-dark-1);font-weight:700}
.cta-inner p{margin-top:12px;font-size:15px;color:var(--on-dark-2);max-width:560px}
.cta-actions{display:flex;flex-wrap:wrap;gap:14px}

/* ---------- 页脚 ---------- */
.footer{
  background:var(--ink-900);color:var(--on-dark-2);
  border-top:1px solid var(--line-dark);
  padding:64px 0 32px;
}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1.2fr;gap:32px}
.footer-brand .brand{height:auto;padding:0;font-size:18px;font-weight:700;color:var(--on-dark-1);margin-bottom:16px}
.footer-brand p{font-size:14px;line-height:1.8;color:var(--on-dark-2);max-width:340px}
.footer h4{font-size:15px;font-weight:700;color:var(--on-dark-1);margin-bottom:16px}
.footer-links{display:flex;flex-direction:column;gap:10px}
.footer-links a{font-size:14.5px;color:var(--on-dark-2);text-decoration:none;width:fit-content}
.footer-links a:hover{color:var(--primary);text-decoration:underline;text-underline-offset:3px}
.footer-contact{display:flex;flex-direction:column;gap:10px;font-size:14px;line-height:1.75;color:var(--on-dark-2)}
.footer-bottom{
  margin-top:48px;padding-top:22px;border-top:1px solid var(--line-dark);
  display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;
  font-size:13px;color:var(--on-dark-3);
}

/* ---------- 响应式 ---------- */
@media (min-width:1440px){
  :root{--sidebar-w:264px}
  .container{max-width:1320px}
}
@media (max-width:1279px){
  :root{--sidebar-w:216px}
  .container{padding:0 32px}
  .list-grid{gap:40px}
}
@media (max-width:1023px){
  :root{--sidebar-w:280px}
  .topbar{display:flex}
  .sidebar{transform:translateX(-100%);box-shadow:var(--shadow-dark)}
  body.is-drawer-open .sidebar{transform:translateX(0)}
  .main,.footer{margin-left:0}
  .main{padding-top:64px}
  .container{padding:0 28px}
  .hero{padding:56px 0 48px}
  .hero-grid{grid-template-columns:1fr;gap:36px}
  .hero-media{order:2}
  .section{padding:72px 0}
  .list-grid{grid-template-columns:1fr;gap:24px}
  .anchor-list{display:none}
  .anchor-bar{
    display:flex;gap:8px;overflow-x:auto;padding:4px 0 14px;
    scrollbar-width:none;-ms-overflow-style:none;
  }
  .anchor-bar::-webkit-scrollbar{display:none}
  .anchor-bar a{
    flex:0 0 auto;padding:8px 15px;border-radius:var(--radius-pill);
    background:var(--sand-100);border:1px solid var(--line-light);
    font-size:14px;color:var(--text-2);text-decoration:none;white-space:nowrap;
  }
  .anchor-bar a.is-current{
    background:rgba(33,212,196,.14);border-color:var(--primary);color:var(--primary-deep);font-weight:600;
  }
  .stat-bar{grid-template-columns:repeat(2,minmax(0,1fr))}
  .stat:nth-child(3){border-left:0;border-top:1px solid var(--line-light)}
  .stat:nth-child(4){border-top:1px solid var(--line-light)}
  .scene-grid{grid-template-columns:1fr;gap:18px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:28px}
  .footer-brand{grid-column:1 / -1}
}
@media (max-width:767px){
  body{font-size:15px;line-height:1.85}
  .topbar{height:56px}
  .main{padding-top:56px}
  .sidebar{width:min(86vw,320px)}
  .nav a{height:48px;font-size:16px}
  .container{padding:0 20px}
  .section{padding:56px 0}
  .hero{padding:44px 0 40px}
  .hero h1{font-size:clamp(30px,8vw,40px)}
  .hero-actions{gap:12px}
  .hero-actions .btn{width:100%}
  .crumb-bar{height:auto;padding:10px 0}
  .entry{grid-template-columns:44px minmax(0,1fr);gap:14px;padding:26px 0}
  .entry h3{font-size:18.5px}
  .entry p{font-size:15px}
  .cta-inner{padding:52px 0;flex-direction:column;align-items:flex-start}
  .cta-actions{width:100%}
  .cta-actions .btn{width:100%}
  .footer{padding:52px 0 28px}
  .footer-grid{grid-template-columns:1fr;gap:26px}
  .footer-bottom{flex-direction:column;gap:8px}
}
@media (max-width:520px){
  .stat{padding:22px 18px}
  .stat-bar{grid-template-columns:1fr 1fr}
  .scene{padding:24px}
  .faq-q{font-size:16px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition-duration:.01ms !important;animation-duration:.01ms !important}
  .btn:hover,.scene:hover{transform:none !important}
}