/* =====================================================
   MediaHub 前台样式 · 现代 SaaS 风格
   ===================================================== */
:root{
  --bg:#ffffff; --bg-soft:#f6f8fc; --ink:#10131a; --ink2:#5b6472; --line:#e8ecf3;
  --brand:#2f6bff; --brand2:#7c4dff; --grad:linear-gradient(120deg,#2f6bff,#7c4dff 60%,#b44dff);
  --ok:#00b894; --warn:#e8a13c; --radius:16px;
  --shadow:0 10px 40px rgba(30,50,120,.10);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:"PingFang SC","Microsoft YaHei",-apple-system,"Segoe UI",sans-serif;color:var(--ink);background:var(--bg);line-height:1.7;font-size:15px;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
img{max-width:100%}
.container{max-width:1180px;margin:0 auto;padding:0 24px}

/* ---------- 导航 ---------- */
.nav{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.82);backdrop-filter:blur(14px);border-bottom:1px solid transparent;transition:.25s}
.nav.scrolled{border-color:var(--line);box-shadow:0 4px 20px rgba(20,40,90,.06)}
.nav-in{display:flex;align-items:center;gap:34px;height:68px}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:19px}
.logo .mark{width:32px;height:32px;border-radius:9px;background:var(--grad);display:grid;place-items:center;color:#fff;font-size:15px;font-weight:800}
.nav-links{display:flex;gap:26px;margin-left:12px}
.nav-links a{color:var(--ink2);font-size:14.5px;padding:6px 2px;position:relative}
.nav-links a:hover,.nav-links a.active{color:var(--ink)}
.nav-links a.active::after{content:"";position:absolute;left:0;right:0;bottom:-2px;height:3px;border-radius:3px;background:var(--grad)}
.nav-right{margin-left:auto;display:flex;gap:12px;align-items:center}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:none;cursor:pointer;font-family:inherit;font-size:14.5px;padding:10px 22px;border-radius:10px;transition:.2s;font-weight:600}
.btn-ghost{background:transparent;border:1px solid var(--line);color:var(--ink)}
.btn-ghost:hover{border-color:var(--brand);color:var(--brand)}
.btn-primary{background:var(--grad);color:#fff;box-shadow:0 8px 22px rgba(64,90,255,.32)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 12px 28px rgba(64,90,255,.42)}
.btn-lg{padding:14px 34px;font-size:16px;border-radius:12px}

/* ---------- Hero ---------- */
.hero{position:relative;overflow:hidden;padding:88px 0 70px;background:
  radial-gradient(900px 420px at 85% -10%,rgba(124,77,255,.14),transparent),
  radial-gradient(700px 380px at 0% 10%,rgba(47,107,255,.12),transparent),var(--bg)}
.hero::before{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(47,107,255,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(47,107,255,.05) 1px,transparent 1px);background-size:44px 44px;mask-image:radial-gradient(ellipse at center top,black,transparent 72%)}
.hero-in{position:relative;display:grid;grid-template-columns:1.05fr .95fr;gap:44px;align-items:center}
.hero h1{font-size:48px;line-height:1.22;font-weight:800;letter-spacing:-.5px}
.hero h1 .grad{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p.sub{margin:18px 0 30px;color:var(--ink2);font-size:17px;max-width:520px}
.hero-cta{display:flex;gap:14px;align-items:center}
.hero-note{margin-top:14px;font-size:13px;color:#9aa3b2}
/* 工作台模拟窗 */
.mock{background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow);overflow:hidden}
.mock-bar{height:40px;display:flex;align-items:center;gap:6px;padding:0 14px;border-bottom:1px solid var(--line);background:#fafbfe}
.mock-bar i{width:10px;height:10px;border-radius:50%}
.mock-bar i:nth-child(1){background:#ff5f57}.mock-bar i:nth-child(2){background:#febc2e}.mock-bar i:nth-child(3){background:#28c840}
.mock-body{display:grid;grid-template-columns:64px 1fr;min-height:340px}
.mock-side{background:#0f1420;padding:14px 0;display:flex;flex-direction:column;gap:6px;align-items:center}
.mock-side i{width:36px;height:36px;border-radius:9px;background:rgba(255,255,255,.07)}
.mock-side i.on{background:var(--grad)}
.mock-main{padding:16px;display:flex;flex-direction:column;gap:12px}
.mock-row{display:flex;gap:12px}
.mock-card{flex:1;border:1px solid var(--line);border-radius:10px;padding:12px}
.mock-card .k{font-size:11px;color:#9aa3b2}
.mock-card .v{font-size:18px;font-weight:800;margin-top:2px}
.mock-chart{flex:2;border:1px solid var(--line);border-radius:10px;padding:12px;display:flex;align-items:flex-end;gap:8px;min-height:120px}
.mock-chart i{flex:1;border-radius:6px 6px 0 0;background:linear-gradient(180deg,#7c9bff,#2f6bff)}

/* ---------- 数据条 ---------- */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin:64px 0}
.stat{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px;text-align:center;transition:.25s}
.stat:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.stat .num{font-size:34px;font-weight:800;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.stat .lbl{color:var(--ink2);font-size:13.5px;margin-top:4px}

/* ---------- 区块 ---------- */
.section{padding:72px 0}
.section.alt{background:var(--bg-soft)}
.sec-head{text-align:center;margin-bottom:44px}
.sec-head .kicker{display:inline-block;font-size:12.5px;font-weight:700;color:var(--brand);background:rgba(47,107,255,.08);border:1px solid rgba(47,107,255,.18);padding:4px 14px;border-radius:20px;margin-bottom:12px}
.sec-head h2{font-size:32px;font-weight:800;letter-spacing:-.3px}
.sec-head p{color:var(--ink2);margin-top:10px}

/* 功能卡片 */
.grid{display:grid;gap:18px}
.g3{grid-template-columns:repeat(3,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}
.g2{grid-template-columns:repeat(2,1fr)}
.feature{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px;transition:.25s;position:relative;overflow:hidden}
.feature:hover{transform:translateY(-5px);box-shadow:var(--shadow);border-color:rgba(47,107,255,.35)}
.feature .icon{width:46px;height:46px;border-radius:12px;display:grid;place-items:center;font-size:22px;margin-bottom:14px;background:linear-gradient(135deg,rgba(47,107,255,.12),rgba(124,77,255,.12));color:var(--brand)}
.feature h3{font-size:17px;margin-bottom:8px}
.feature p{color:var(--ink2);font-size:13.8px}
.feature .tags{margin-top:12px;display:flex;flex-wrap:wrap;gap:6px}
.feature .tags span{font-size:11.5px;color:#6978d8;background:rgba(47,107,255,.07);padding:2px 9px;border-radius:12px}

/* 平台墙 */
.wall{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:12px}
.pcard{display:flex;align-items:center;gap:10px;background:#fff;border:1px solid var(--line);border-radius:12px;padding:12px 14px;transition:.2s}
.pcard:hover{border-color:var(--brand);transform:translateY(-3px);box-shadow:0 8px 20px rgba(47,107,255,.12)}
.pcard .dot{width:34px;height:34px;border-radius:9px;display:grid;place-items:center;color:#fff;font-weight:800;font-size:15px;flex-shrink:0}
/* 平台真实图标：叠在品牌色首字之上，取不到图时自动露出首字 */
.pcard .dot.pico{position:relative;overflow:hidden}
.pcard .dot.pico img{position:absolute;inset:0;width:100%;height:100%;object-fit:contain;background:#fff}
.pcard .n{font-size:13.5px;font-weight:600}
.pcard .t{font-size:11px;color:#9aa3b2}

/* 步骤 */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:0;counter-reset:st}
.step{position:relative;padding:0 22px;text-align:center}
.step::before{counter-increment:st;content:"0" counter(st);font-size:52px;font-weight:800;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;opacity:.9}
.step h4{margin:8px 0 6px;font-size:16.5px}
.step p{color:var(--ink2);font-size:13.5px}
.step::after{content:"→";position:absolute;right:-8px;top:18px;color:#c9d2e4;font-size:22px}
.step:last-child::after{display:none}

/* 热点 */
.hot-item{display:flex;gap:14px;align-items:center;background:#fff;border:1px solid var(--line);border-radius:12px;padding:14px 18px;margin-bottom:10px;transition:.2s}
.hot-item:hover{border-color:var(--brand)}
.hot-item .rank{font-weight:800;font-size:16px;color:#c3cad8;width:26px}
.hot-item .rank.top{color:#ff5a3c}
.hot-item .t{flex:1;font-size:14.5px;font-weight:600}
.hot-item .meta{font-size:12px;color:#9aa3b2}
.badge{font-size:11px;padding:2px 9px;border-radius:12px;font-weight:600}
.badge.blue{background:rgba(47,107,255,.1);color:var(--brand)}

/* 价格 */
.price-card{background:#fff;border:1px solid var(--line);border-radius:20px;padding:34px 30px;position:relative;transition:.25s}
.price-card:hover{transform:translateY(-6px);box-shadow:var(--shadow)}
.price-card.hot{border:2px solid transparent;background:linear-gradient(#fff,#fff) padding-box,var(--grad) border-box}
.price-card .ribbon{position:absolute;top:-13px;left:50%;transform:translateX(-50%);background:var(--grad);color:#fff;font-size:12px;padding:4px 16px;border-radius:20px;font-weight:700}
.price-card h3{font-size:19px}
.price-card .price{margin:16px 0 4px;font-size:40px;font-weight:800}
.price-card .price small{font-size:14px;color:#9aa3b2;font-weight:400}
.price-card .origin{color:#b6bdc9;font-size:13px;text-decoration:line-through}
.price-card ul{list-style:none;margin:20px 0 26px;display:flex;flex-direction:column;gap:10px}
.price-card li{display:flex;gap:9px;font-size:14px;color:#3a4458}
.price-card li::before{content:"✓";color:var(--ok);font-weight:800}
.price-card .btn{width:100%}
.price-note{text-align:center;color:#9aa3b2;font-size:13px;margin-top:26px}

/* FAQ */
.faq{max-width:820px;margin:0 auto}
.faq details{background:#fff;border:1px solid var(--line);border-radius:12px;padding:18px 22px;margin-bottom:12px}
.faq summary{font-weight:700;cursor:pointer;font-size:15px}
.faq p{color:var(--ink2);margin-top:10px;font-size:14px}

/* 教程 */
.tut-card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:24px;transition:.25s}
.tut-card:hover{box-shadow:var(--shadow);transform:translateY(-4px)}
.tut-card h3{font-size:16.5px;margin:10px 0 8px}
.tut-card p{color:var(--ink2);font-size:13.5px}
.prose{background:#fff;border:1px solid var(--line);border-radius:16px;padding:40px;font-size:15.5px}
.prose h2{font-size:21px;margin:26px 0 12px}
.prose p{color:#3a4458;margin:10px 0}

/* 下载 */
.dl-card{display:flex;gap:20px;align-items:center;background:#fff;border:1px solid var(--line);border-radius:18px;padding:30px;max-width:680px;margin:0 auto}
.dl-icon{width:74px;height:74px;border-radius:18px;background:var(--grad);display:grid;place-items:center;color:#fff;font-size:34px;flex-shrink:0}

/* 登录页 */
.auth-wrap{min-height:100vh;display:grid;place-items:center;background:radial-gradient(800px 400px at 20% 0%,rgba(47,107,255,.10),transparent),radial-gradient(700px 400px at 90% 100%,rgba(124,77,255,.12),transparent),var(--bg-soft)}
.auth-card{width:420px;max-width:92vw;background:#fff;border:1px solid var(--line);border-radius:20px;padding:40px;box-shadow:var(--shadow)}
.auth-card h1{font-size:23px;text-align:center;margin-bottom:6px}
.auth-card .sub{text-align:center;color:var(--ink2);font-size:13.5px;margin-bottom:26px}
.field{margin-bottom:16px}
.field label{display:block;font-size:13px;color:var(--ink2);margin-bottom:6px;font-weight:600}
.field input,.field select,.field textarea{width:100%;border:1px solid var(--line);border-radius:10px;padding:11px 14px;font-size:14.5px;font-family:inherit;outline:none;transition:.2s;background:#fff}
.field input:focus,.field textarea:focus{border-color:var(--brand);box-shadow:0 0 0 3px rgba(47,107,255,.12)}
.auth-foot{text-align:center;margin-top:18px;font-size:13.5px;color:var(--ink2)}
.msg{border-radius:10px;padding:10px 14px;font-size:13.5px;margin-bottom:14px;display:none}
.msg.err{background:#fdecec;color:#c0392b;display:block}
.msg.ok{background:#ecfbf5;color:#0a8f6c;display:block}

/* Footer */
footer{background:#0f1420;color:#8d97a8;padding:60px 0 30px;margin-top:40px}
.f-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:36px}
.f-grid h4{color:#fff;font-size:15px;margin-bottom:16px}
.f-grid a{display:block;font-size:13.5px;margin-bottom:10px;transition:.2s}
.f-grid a:hover{color:#fff}
.f-logo{color:#fff;font-weight:800;font-size:19px;margin-bottom:14px}
.f-bottom{border-top:1px solid rgba(255,255,255,.08);margin-top:44px;padding-top:22px;text-align:center;font-size:12.5px}

/* 动画 */
@keyframes fadeUp{from{opacity:0;transform:translateY(26px)}to{opacity:1;transform:none}}
.fade-up{animation:fadeUp .7s ease both}
.d1{animation-delay:.08s}.d2{animation-delay:.16s}.d3{animation-delay:.24s}.d4{animation-delay:.32s}
@media(max-width:960px){
  .hero-in{grid-template-columns:1fr}
  .hero h1{font-size:34px}
  .g3,.g4,.steps,.f-grid{grid-template-columns:1fr 1fr}
  .stats{grid-template-columns:1fr 1fr}
  .nav-links{display:none}
}
@media(max-width:600px){.g3,.g4,.g2,.steps,.f-grid{grid-template-columns:1fr}}