/* ============================================================
   landing-premium.css · 暮榆网络展示页高级感样式体系
   深色基调 · 翡翠绿主色 · 玻璃拟态 · 微动效
   版本 20260809a
   ============================================================ */

/* ---------- 设计 Token ---------- */
:root{
  --bg-0:#0A0C10; --bg-1:#0F1216; --bg-2:#151A20;
  --line:rgba(255,255,255,.08); --line-strong:rgba(255,255,255,.16);
  --primary:#34D399; --primary-600:#10B981; --primary-glow:rgba(52,211,153,.35);
  --accent:#60A5FA;
  --text-0:#F4F6F8; --text-1:#A6ADB4; --text-2:#6B7280;
  --radius-sm:8px; --radius-md:12px; --radius-lg:16px; --radius-xl:24px;
  --shadow-sm:0 2px 8px rgba(0,0,0,.3);
  --shadow-md:0 8px 24px rgba(0,0,0,.35);
  --shadow-lg:0 16px 48px rgba(0,0,0,.45);
  --font-sans:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --font-display:"Inter","Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --font-mono:"JetBrains Mono","Consolas",monospace;
  --container:1200px; --gutter:24px; --space:96px;
}

/* ---------- 基础 ---------- */
*{margin:0;padding:0;box-sizing:border-box;}
html{scroll-behavior:smooth;scroll-padding-top:84px;}
body{font-family:var(--font-sans);background:var(--bg-0);color:var(--text-0);line-height:1.7;font-size:15px;-webkit-font-smoothing:antialiased;}
a{text-decoration:none;color:inherit;}
img{max-width:100%;display:block;}
.container{max-width:var(--container);margin:0 auto;padding:0 var(--gutter);}
section{padding:var(--space) 0;}
.section-head{text-align:center;margin-bottom:52px;}
.section-head h2{font-size:32px;font-weight:700;letter-spacing:-.01em;line-height:1.2;}
.section-head .lead{color:var(--text-1);margin-top:12px;font-size:15px;max-width:560px;margin-left:auto;margin-right:auto;}

/* ---------- 顶部导航（玻璃拟态） ---------- */
.topbar{position:fixed;top:0;left:0;right:0;height:64px;z-index:100;display:flex;align-items:center;
  background:transparent;transition:background .3s ease,backdrop-filter .3s ease,border-color .3s ease;
  border-bottom:1px solid transparent;}
.topbar.scrolled{background:rgba(10,12,16,.7);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom-color:var(--line);}
.topbar-inner{max-width:var(--container);margin:0 auto;padding:0 var(--gutter);width:100%;display:flex;align-items:center;gap:32px;}
.brand{display:flex;align-items:center;gap:10px;font-weight:600;font-size:16px;}
.brand img{width:32px;height:32px;border-radius:8px;object-fit:cover;}
.brand small{display:block;color:var(--text-2);font-size:11px;font-weight:400;}
.top-nav{display:flex;gap:2px;flex:1;}
.nav-toggle{display:none;background:transparent;border:1px solid var(--line);color:var(--text-1);
  width:38px;height:38px;border-radius:var(--radius-sm);cursor:pointer;font-size:17px;transition:.2s;align-items:center;justify-content:center;}
.nav-toggle:hover{color:var(--text-0);border-color:var(--line-strong);}
.mobile-nav{display:none;position:fixed;top:64px;left:12px;right:12px;z-index:99;
  background:rgba(15,18,22,.95);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  border:1px solid var(--line);border-radius:var(--radius-lg);padding:10px;
  box-shadow:var(--shadow-lg);transform-origin:top;animation:navIn .2s ease-out;}
.mobile-nav a{display:block;color:var(--text-1);font-size:14.5px;padding:13px 16px;border-radius:var(--radius-sm);transition:.2s;}
.mobile-nav a:hover{color:var(--text-0);background:rgba(255,255,255,.06);}
@keyframes navIn{from{opacity:0;transform:translateY(-8px);}to{opacity:1;transform:none;}}
.top-nav a{color:var(--text-1);font-size:13.5px;padding:8px 13px;border-radius:var(--radius-sm);transition:.2s;white-space:nowrap;}
.top-nav a:hover{color:var(--text-0);background:rgba(255,255,255,.06);}
.top-nav a.active{color:var(--text-0);position:relative;}
.top-nav a.active::after{content:'';position:absolute;left:13px;right:13px;bottom:2px;height:2px;border-radius:2px;background:var(--primary);}
.topbar-right{display:flex;align-items:center;gap:12px;margin-left:auto;}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:0;cursor:pointer;
  font-family:var(--font-sans);font-size:14px;font-weight:500;border-radius:10px;
  padding:11px 26px;transition:all .25s ease;position:relative;overflow:hidden;}
.btn-primary{background:linear-gradient(135deg,#10B981,#0EA5E9);color:#fff;}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 30px var(--primary-glow);}
.btn-primary::before{content:'';position:absolute;top:0;left:-80%;width:50%;height:100%;
  background:linear-gradient(100deg,transparent,rgba(255,255,255,.25),transparent);transform:skewX(-20deg);transition:left .5s ease;}
.btn-primary:hover::before{left:130%;}
.btn-ghost{background:transparent;color:var(--text-0);border:1px solid var(--line-strong);}
.btn-ghost:hover{border-color:var(--primary);color:var(--primary);transform:translateY(-2px);}
.btn-lg{padding:15px 36px;font-size:15px;border-radius:12px;}
.staff-link{font-size:13px;color:var(--text-2);padding:7px 14px;border:1px solid var(--line);border-radius:var(--radius-sm);transition:.2s;}
.staff-link:hover{color:var(--text-0);border-color:var(--line-strong);background:rgba(255,255,255,.05);}

/* ---------- Hero ---------- */
.hero{min-height:100vh;display:flex;flex-direction:column;justify-content:center;align-items:center;text-align:center;
  padding:140px 24px 80px;position:relative;overflow:hidden;
  background:
    radial-gradient(60% 50% at 70% -10%,rgba(52,211,153,.14),transparent),
    radial-gradient(50% 40% at 10% 20%,rgba(96,165,250,.10),transparent),
    var(--bg-0);}
.hero::before{content:'';position:absolute;inset:0;pointer-events:none;
  background-image:linear-gradient(rgba(255,255,255,.03) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.03) 1px,transparent 1px);
  background-size:40px 40px;
  -webkit-mask-image:radial-gradient(70% 60% at 50% 40%,#000 30%,transparent 100%);
  mask-image:radial-gradient(70% 60% at 50% 40%,#000 30%,transparent 100%);}
.hero-logo{width:88px;height:88px;border-radius:22px;object-fit:cover;box-shadow:var(--shadow-lg),0 0 60px rgba(52,211,153,.25);margin-bottom:30px;position:relative;}
.hero h1{font-size:clamp(34px,5.5vw,56px);font-weight:700;line-height:1.1;letter-spacing:-.02em;max-width:840px;position:relative;}
.hero .sub{margin-top:20px;font-size:clamp(15px,2vw,18px);color:var(--text-1);max-width:640px;position:relative;}
.hero .cta{margin-top:38px;display:flex;gap:14px;flex-wrap:wrap;justify-content:center;position:relative;}
.stats{display:flex;gap:56px;margin-top:56px;flex-wrap:wrap;justify-content:center;position:relative;}
.stat{text-align:center;}
.stat b{font-size:38px;display:block;color:var(--primary);font-variant-numeric:tabular-nums;font-weight:600;letter-spacing:-.01em;}
.stat span{font-size:12.5px;color:var(--text-2);letter-spacing:.04em;}

/* ---------- 卡片（服务/场景） ---------- */
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:20px;}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;}
.card{background:var(--bg-1);border:1px solid var(--line);border-radius:var(--radius-lg);padding:28px;
  transition:transform .25s ease,border-color .25s ease,box-shadow .25s ease;position:relative;overflow:hidden;}
.card::before{content:'';position:absolute;inset:0;pointer-events:none;opacity:0;transition:opacity .3s ease;
  background:radial-gradient(300px at var(--mx,50%) var(--my,50%),rgba(52,211,153,.07),transparent);}
.card:hover{transform:translateY(-4px);border-color:var(--line-strong);box-shadow:var(--shadow-md);}
.card:hover::before{opacity:1;}
.card .ico{width:44px;height:44px;border-radius:var(--radius-md);background:var(--bg-2);color:var(--primary);
  display:flex;align-items:center;justify-content:center;font-size:20px;font-weight:600;margin-bottom:18px;border:1px solid var(--line);}
.card h3{font-size:17px;font-weight:500;margin-bottom:8px;}
.card p{font-size:13.5px;color:var(--text-1);line-height:1.7;}
.card .tags{margin-top:14px;display:flex;gap:6px;flex-wrap:wrap;}
.card .tags span{font-size:11.5px;color:var(--primary);background:rgba(52,211,153,.1);border:1px solid rgba(52,211,153,.2);padding:3px 11px;border-radius:20px;}
.scenario .tag{display:inline-block;font-size:11.5px;color:var(--accent);background:rgba(96,165,250,.1);border:1px solid rgba(96,165,250,.25);padding:3px 12px;border-radius:20px;margin-bottom:16px;}
.scenario .link{margin-top:16px;display:inline-block;font-size:13px;color:var(--primary);font-weight:500;}
.scenario .link:hover{color:var(--text-0);}

/* ---------- 流程 ---------- */
.flow .step{background:var(--bg-1);border:1px solid var(--line);border-radius:var(--radius-lg);padding:26px 20px;text-align:center;transition:.25s;}
.flow .step:hover{border-color:var(--primary);transform:translateY(-3px);box-shadow:0 12px 32px rgba(0,0,0,.35);}
.flow .step b{font-size:26px;color:var(--primary);display:block;margin-bottom:8px;font-weight:600;font-variant-numeric:tabular-nums;}
.flow .step span{font-size:13px;color:var(--text-1);}

/* ---------- 案例 ---------- */
.case-card{background:var(--bg-1);border:1px solid var(--line);border-radius:var(--radius-lg);overflow:hidden;transition:.25s;position:relative;}
.case-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-md);border-color:var(--line-strong);}
.case-card .cover{height:150px;background:linear-gradient(135deg,rgba(16,185,129,.25),rgba(14,165,233,.25)),var(--bg-2);
  display:flex;align-items:center;justify-content:center;color:var(--primary);font-size:34px;font-weight:600;
  border-bottom:1px solid var(--line);}
.case-card .body{padding:22px;}
.case-card .tag{font-size:11px;color:var(--accent);background:rgba(96,165,250,.1);padding:2px 10px;border-radius:20px;}
.case-card h3{font-size:15.5px;font-weight:500;margin:12px 0 6px;}
.case-card p{font-size:13px;color:var(--text-1);}
.case-card .metric{margin-top:12px;font-size:13px;color:var(--primary);font-weight:500;}
.cases-more{text-align:center;margin-top:40px;}

/* ---------- 评价 ---------- */
.quote{background:var(--bg-1);border:1px solid var(--line);border-radius:var(--radius-lg);padding:26px;transition:.25s;}
.quote:hover{border-color:var(--line-strong);transform:translateY(-3px);}
.quote .mark{font-size:36px;color:var(--primary);font-family:serif;line-height:1;opacity:.7;}
.quote p{font-size:14px;color:var(--text-0);margin:12px 0 16px;line-height:1.7;}
.quote .who{font-size:12.5px;color:var(--text-2);}

/* ---------- FAQ ---------- */
.faq{max-width:760px;margin:0 auto;}
.faq details{background:var(--bg-1);border:1px solid var(--line);border-radius:var(--radius-md);margin-bottom:10px;overflow:hidden;transition:border-color .25s;}
.faq details[open]{border-color:var(--line-strong);}
.faq summary{padding:18px 22px;cursor:pointer;font-size:14.5px;font-weight:500;list-style:none;display:flex;justify-content:space-between;align-items:center;color:var(--text-0);}
.faq summary::-webkit-details-marker{display:none;}
.faq summary::after{content:'+';font-size:20px;color:var(--primary);transition:transform .25s ease;font-weight:400;}
.faq details[open] summary::after{transform:rotate(45deg);}
.faq details p{padding:0 22px 18px;font-size:13.5px;color:var(--text-1);}
.faq details .faq-body{display:grid;grid-template-rows:0fr;transition:grid-template-rows .3s ease;}
.faq details[open] .faq-body{grid-template-rows:1fr;}
.faq details .faq-body > div{overflow:hidden;}

/* ---------- CTA ---------- */
.cta-band{background:var(--bg-1);border-top:1px solid var(--line);border-bottom:1px solid var(--line);
  text-align:center;padding:90px 24px;position:relative;overflow:hidden;}
.cta-band::before{content:'';position:absolute;inset:0;pointer-events:none;
  background:radial-gradient(50% 80% at 50% 0%,rgba(52,211,153,.10),transparent);}
.cta-band h2{font-size:34px;font-weight:700;letter-spacing:-.01em;position:relative;}
.cta-band p{color:var(--text-1);font-size:15px;margin:14px 0 34px;position:relative;}
.cta-band .btn{position:relative;}
.cta-band .wechat{margin-left:14px;font-size:14px;color:var(--text-2);position:relative;}

/* ---------- 页脚 ---------- */
footer{background:var(--bg-0);border-top:1px solid var(--line);padding:56px 24px 28px;}
.footer-grid{max-width:var(--container);margin:0 auto;display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;padding-bottom:36px;}
.footer-grid h4{color:var(--text-0);font-size:14px;font-weight:500;margin-bottom:16px;}
.footer-grid a{display:block;font-size:13px;color:var(--text-2);padding:4px 0;transition:.2s;}
.footer-grid a:hover{color:var(--text-0);}
.footer-grid p{font-size:13px;color:var(--text-2);line-height:1.8;}
.copyright{max-width:var(--container);margin:0 auto;border-top:1px solid var(--line);padding-top:20px;font-size:12.5px;color:var(--text-2);text-align:center;}
.copyright a{color:var(--text-1);}

/* ---------- 滚动浮现 ---------- */
.reveal{opacity:0;transform:translateY(24px);transition:opacity .5s ease-out,transform .5s ease-out;}
.reveal.visible{opacity:1;transform:none;}

/* ---------- 减弱动效 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *{animation:none!important;transition:none!important;}
  .reveal{opacity:1;transform:none;}
}

/* ---------- 响应式 ---------- */
@media (max-width:1200px){
  .grid-3,.grid-4{grid-template-columns:repeat(2,1fr);}
}
@media (max-width:992px){
  :root{--space:64px;}
  .top-nav{display:none;}
  .nav-toggle{display:inline-flex;}
  .grid-2,.grid-3,.grid-4{grid-template-columns:1fr;}
  .footer-grid{grid-template-columns:1fr 1fr;}
}
@media (max-width:768px){
  :root{--space:48px;}
  .hero{padding-top:110px;}
  .hero h1{font-size:32px;}
  .stats{gap:28px;}
  .stat b{font-size:30px;}
  .footer-grid{grid-template-columns:1fr;}
  .topbar-inner{gap:12px;}
}


/* 回到顶部 */
.to-top{position:fixed;right:22px;bottom:24px;z-index:90;width:44px;height:44px;border-radius:50%;
  background:rgba(15,18,22,.85);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);
  border:1px solid var(--line-strong);color:var(--text-1);font-size:18px;cursor:pointer;
  opacity:0;transform:translateY(12px);pointer-events:none;transition:opacity .3s ease,transform .3s ease,color .2s;
  display:flex;align-items:center;justify-content:center;}
.to-top.show{opacity:1;transform:none;pointer-events:auto;}
.to-top:hover{color:var(--primary);border-color:var(--primary);}


/* ===== 第三轮优化 ===== */
.scroll-progress{position:fixed;top:0;left:0;height:2px;width:0;background:linear-gradient(90deg,#10B981,#0EA5E9);z-index:120;transition:width .1s linear;}
.hero-anim{opacity:0;animation:heroIn .6s ease-out forwards;}
.hero-logo.hero-anim{animation-delay:.05s;}
.hero h1.hero-anim{animation-delay:.15s;}
.hero .sub.hero-anim{animation-delay:.28s;}
.hero .cta.hero-anim{animation-delay:.42s;}
.hero .stats.hero-anim{animation-delay:.56s;}
@keyframes heroIn{from{opacity:0;transform:translateY(18px);}to{opacity:1;transform:none;}}
.lead-form{max-width:640px;margin:0 auto;}
.lead-row{display:grid;grid-template-columns:1fr 1fr;gap:10px;}
.lead-row input{background:rgba(255,255,255,.05);border:1px solid var(--line);border-radius:10px;padding:13px 16px;color:var(--text-0);font-size:14px;font-family:var(--font-sans);transition:.2s;}
.lead-row input::placeholder{color:var(--text-2);}
.lead-row input:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px rgba(52,211,153,.12);}
.lead-row input[name=note]{grid-column:1/-1;}
.lead-row .btn{grid-column:1/-1;width:100%;}
.lead-feedback{min-height:22px;font-size:13.5px;margin-top:10px;color:var(--text-1);}
.card .ico{transition:box-shadow .25s ease,background .25s ease,transform .25s ease;}
.card:hover .ico{box-shadow:0 0 24px rgba(52,211,153,.3);transform:scale(1.05);}
@media(max-width:640px){.lead-row{grid-template-columns:1fr;}}
@media (prefers-reduced-motion:reduce){.hero-anim{opacity:1;animation:none;}}