:root{
  --bg:#f7f3ee;
  --bg-2:#f1ede6;
  --bg-3:#ffffff;
  --ink:#1f2937;
  --ink-2:#2b3442;
  --muted:#6b7280;
  --accent:#f59e0b;
  --accent-2:#2563eb;
  --line:#e6e1d8;
  --radius:18px;
  --shadow:0 18px 40px rgba(31,41,55,0.12);
}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:"Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;background:var(--bg);color:var(--ink);line-height:1.7}
img{max-width:100%;display:block}
a{text-decoration:none;color:inherit}
.portal-wrap{width:min(1280px,92%);margin:0 auto}

.portal-header{position:sticky;top:0;z-index:999;background:rgba(247,243,238,0.9);backdrop-filter:blur(8px);border-bottom:1px solid var(--line);transition:.2s}
.portal-header.is-sticky{box-shadow:0 8px 30px rgba(31,41,55,0.12)}
.portal-header__row{display:flex;align-items:center;justify-content:space-between;height:76px}
.portal-brand{display:flex;align-items:center;gap:10px;font-weight:700;color:var(--ink-2)}
.portal-brand img{height:28px}
.portal-nav{display:flex;gap:16px;font-size:13px;color:var(--ink-2);flex-wrap:wrap}
.portal-nav a{padding:6px 10px;border-radius:999px;transition:.2s}
.portal-nav a:hover{background:rgba(245,158,11,0.14)}
.portal-cta{background:var(--accent);color:#fff}
.portal-toggle{display:none;width:40px;height:40px;border:1px solid var(--line);border-radius:10px;background:transparent;position:relative}
.portal-toggle::before,.portal-toggle::after{content:"";position:absolute;left:9px;right:9px;height:2px;background:var(--ink)}
.portal-toggle::before{top:12px}.portal-toggle::after{bottom:12px}
.portal-panel{display:none;flex-direction:column;gap:10px;padding:10px 0 16px}
.portal-panel a{background:var(--bg-3);border:1px solid var(--line);padding:8px 10px;border-radius:10px}
.portal-panel.open{display:flex}

.cover-board{padding:110px 0 90px;background:linear-gradient(160deg,#f7f3ee 0%,#f1ede6 60%,#ffffff 100%);position:relative}
.cover-board__grid{display:grid;grid-template-columns:1.2fr .8fr;gap:28px;align-items:center}
.cover-badge{display:inline-flex;align-items:center;gap:8px;padding:8px 12px;border-radius:999px;background:#fff;border:1px solid var(--line);font-size:12px;color:var(--muted)}
.cover-copy h1{font-size:38px;line-height:1.2;margin-top:14px}
.cover-copy p{color:var(--muted);margin-top:10px}
.cover-actions{display:flex;gap:12px;margin-top:18px;flex-wrap:wrap}
.btn-main{background:var(--accent);color:#fff;border:0;border-radius:12px;padding:12px 20px;font-weight:600;box-shadow:var(--shadow);transition:.2s}
.btn-ghost{background:#fff;border:1px solid var(--line);border-radius:12px;padding:12px 20px;font-weight:600;transition:.2s}
.btn-main:hover,.btn-ghost:hover{transform:translateY(-2px)}
.cover-visual{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;position:relative}
.cover-main{grid-column:1/3;border-radius:22px;box-shadow:var(--shadow);height:300px;object-fit:cover}
.cover-sub{border-radius:18px;box-shadow:var(--shadow);height:170px;object-fit:cover}
.cover-entries{margin-top:26px;display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.entry-card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:16px;display:grid;gap:6px;box-shadow:var(--shadow);transition:.2s}
.entry-card:hover{transform:translateY(-4px);border-color:rgba(245,158,11,0.4)}
.entry-card span{font-weight:600}
.entry-card em{font-size:12px;color:var(--muted)}

.channel-grid{padding:110px 0;background:var(--bg-3)}
.section-title{font-size:26px;margin-bottom:18px}
.channel-grid__list{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.channel-card{background:var(--bg-2);border-radius:18px;padding:20px;display:grid;gap:10px;box-shadow:var(--shadow);transition:.2s}
.channel-card img{width:44px;height:44px;object-fit:contain}
.channel-card a{color:var(--accent-2);font-weight:600}
.channel-card:hover{transform:translateY(-4px)}

.download-zone{padding:110px 0;background:var(--bg-2)}
.download-zone__grid{display:grid;grid-template-columns:1fr 1.2fr;gap:26px}
.download-note p{color:var(--muted)}
.tag-row{display:flex;gap:10px;flex-wrap:wrap;margin:14px 0}
.tag-row span{background:#fff;border:1px solid var(--line);padding:6px 10px;border-radius:999px;font-size:12px}
.version-tip{color:var(--muted);font-size:12px}
.download-blocks{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.download-unit{background:#fff;border:1px solid var(--line);border-radius:16px;padding:16px;display:grid;gap:8px;box-shadow:var(--shadow)}
.download-unit__head{display:flex;gap:10px;align-items:center}
.download-unit__head img{width:36px;height:36px;object-fit:contain}
.download-unit small{color:var(--muted)}
.download-meta{font-size:12px;color:var(--muted)}

.value-board{padding:110px 0;background:#fff}
.value-board__grid{display:grid;gap:18px}
.value-main p{color:var(--muted)}
.value-points{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.value-item{background:var(--bg-2);border-radius:16px;padding:16px;box-shadow:var(--shadow)}
.value-strip{background:var(--bg-2);border-left:4px solid var(--accent);padding:14px;border-radius:12px}

.platform-board{padding:110px 0;background:var(--bg-3)}
.platform-board__grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.platform-card{background:var(--bg-2);border-radius:16px;padding:16px;display:flex;gap:12px;align-items:center;box-shadow:var(--shadow)}
.platform-card img{width:42px;height:42px;object-fit:contain}
.platform-card p{color:var(--muted);font-size:13px}

.asset-board{padding:110px 0;background:var(--bg-2)}
.asset-board__grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.asset-card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:16px;display:grid;gap:8px;box-shadow:var(--shadow)}
.asset-card img{width:40px;height:40px;object-fit:contain}
.network-row{margin-top:18px;display:grid;grid-template-columns:repeat(5,1fr);gap:12px}
.network-card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:12px;display:grid;gap:4px;align-content:start;text-align:center;box-shadow:var(--shadow)}
.network-card img{width:24px;height:24px;object-fit:contain;margin:0 auto}
.network-card em{font-size:12px;color:var(--muted)}

.magazine-board{padding:110px 0;background:var(--bg-3)}
.magazine-board__grid{display:grid;grid-template-columns:1.4fr .8fr .8fr;grid-template-rows:240px 200px;gap:16px}
.magazine-main{grid-row:1/3;grid-column:1/2}
.magazine-strip{grid-column:2/4;grid-row:2/3}
.magazine-board__grid img{width:100%;height:100%;object-fit:cover;border-radius:18px;box-shadow:var(--shadow);transition:.2s}
.magazine-board__grid img:hover{transform:translateY(-4px) scale(1.01)}

.manual-board{padding:110px 0;background:var(--bg-2)}
.manual-board__grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.manual-card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:16px;display:grid;gap:8px;box-shadow:var(--shadow)}

.safety-board{padding:110px 0;background:#fff}
.safety-board__grid{display:grid;gap:16px}
.safety-text p{color:var(--muted)}
.safety-rules{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.safety-rule{background:var(--bg-2);border-radius:16px;padding:14px;box-shadow:var(--shadow)}
.safety-alert{background:rgba(245,158,11,0.12);border:1px solid rgba(245,158,11,0.4);border-radius:12px;padding:12px;color:#8a5b12}

.help-center{padding:110px 0;background:var(--bg-3)}
.help-center__grid{display:grid;grid-template-columns:1fr 1.4fr;gap:22px}
.help-questions{display:grid;gap:10px}
.help-item{border:1px solid var(--line);background:#fff;border-radius:12px;padding:12px;text-align:left;cursor:pointer;transition:.2s}
.help-item.active{border-color:var(--accent);box-shadow:var(--shadow)}
.help-answers{background:var(--bg-2);border-radius:16px;padding:18px;box-shadow:var(--shadow);min-height:220px}
.help-answer{display:none;color:var(--ink-2)}
.help-answer.active{display:block;animation:fadeIn .2s ease}

.brand-dock{padding:110px 0;background:linear-gradient(120deg,#fff4e3,#fff7ef)}
.brand-dock__grid{display:grid;grid-template-columns:1.1fr .6fr .7fr;gap:18px;align-items:center}
.brand-dock__qr img{width:200px;height:200px;border-radius:16px;box-shadow:var(--shadow);object-fit:cover}
.brand-dock__meta{display:grid;gap:8px}
.brand-dock__meta span{background:#fff;border:1px solid var(--line);padding:6px 10px;border-radius:999px;font-size:12px}
.brand-dock__meta em{font-size:12px;color:var(--muted)}

.portal-footer{padding:60px 0;background:#1f2937;color:#f8fafc}
.portal-footer__grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr 1fr;gap:18px}
.portal-footer img{height:28px;margin-bottom:10px}
.portal-footer a,.portal-footer span{display:block;color:#d1d5db;margin-bottom:6px;font-size:13px}
.portal-footer h4{font-size:14px;margin-bottom:10px;color:#fff}

.reveal{opacity:0;transform:translateY(18px);transition:.6s}
.reveal.in{opacity:1;transform:translateY(0)}

@keyframes fadeIn{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}

@media (max-width:1080px){
  .cover-board__grid{grid-template-columns:1fr}
  .cover-entries{grid-template-columns:1fr 1fr}
  .channel-grid__list{grid-template-columns:1fr 1fr}
  .download-zone__grid{grid-template-columns:1fr}
  .download-blocks{grid-template-columns:1fr 1fr}
  .value-points,.platform-board__grid,.asset-board__grid,.manual-board__grid{grid-template-columns:1fr 1fr}
  .network-row{grid-template-columns:repeat(3,1fr)}
  .help-center__grid{grid-template-columns:1fr}
  .brand-dock__grid{grid-template-columns:1fr}
  .portal-footer__grid{grid-template-columns:1fr 1fr}
}
@media (max-width:768px){
  .portal-nav{display:none}
  .portal-toggle{display:block}
  .portal-panel{display:none}
  .cover-copy h1{font-size:30px}
  .cover-entries{grid-template-columns:1fr}
  .channel-grid__list,.download-blocks,.value-points,.platform-board__grid,.asset-board__grid,.manual-board__grid{grid-template-columns:1fr}
  .network-row{grid-template-columns:1fr 1fr}
  .magazine-board__grid{grid-template-columns:1fr;grid-template-rows:auto}
  .magazine-main,.magazine-strip{grid-column:auto;grid-row:auto}
}
@media (max-width:420px){
  .portal-wrap{width:92%}
  .brand-dock__qr img{width:170px;height:170px}
}