:root{
  --ink:#17202e;--muted:#5b6676;--line:#e6eaf0;
  --accent:#2456e6;--accent-soft:#e8efff;
  --bg:#f7f9fc;--card:#ffffff;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:"PingFang SC","Microsoft YaHei","Hiragino Sans GB",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;color:var(--ink);background:var(--bg);line-height:1.75}
body{min-height:100vh;display:flex;flex-direction:column}
main{flex:1 0 auto}
.wrap{max-width:1080px;margin:0 auto;padding:0 24px}
a{color:inherit;text-decoration:none}
img{display:block}

/* ---------- header ---------- */
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.94);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.nav-row{display:flex;align-items:center;justify-content:space-between;height:66px}
.brand{font-size:19px;font-weight:700;letter-spacing:1px;line-height:1.15}
.brand span{display:block;font-size:10px;font-weight:500;color:var(--muted);letter-spacing:3px}
nav{display:flex;gap:6px;flex-wrap:wrap}
nav a{padding:8px 14px;border-radius:8px;font-size:15px;color:var(--muted);transition:.15s}
nav a:hover{color:var(--ink);background:#eef2f8}
nav a.active{color:#fff;background:var(--accent)}

/* ---------- hero ---------- */
.hero{position:relative;overflow:hidden;color:#fff;background:linear-gradient(135deg,#0d1b3e 0%,#123a7a 55%,#0b6a72 100%)}
.hero .wrap{position:relative;z-index:2;padding:92px 24px 100px}
.hero h1{font-size:42px;line-height:1.25;letter-spacing:2px}
.hero p{margin-top:18px;max-width:580px;font-size:16px;color:rgba(255,255,255,.82)}
.hero-cta{margin-top:32px;display:flex;gap:14px;flex-wrap:wrap}
.btn{display:inline-block;padding:11px 28px;border-radius:10px;background:#fff;color:#123a7a;font-weight:600;font-size:15px;transition:.15s}
.btn:hover{transform:translateY(-2px)}
.btn.ghost{background:rgba(255,255,255,.12);color:#fff;border:1px solid rgba(255,255,255,.4)}
.hero-art{position:absolute;inset:0;z-index:1;width:100%;height:100%;opacity:.55}
.hero-art circle{animation:pulse 3.2s ease-in-out infinite}
.hero-art circle:nth-child(2n){animation-delay:1.1s}
.hero-art circle:nth-child(3n){animation-delay:2.2s}
@keyframes pulse{0%,100%{opacity:.35}50%{opacity:1}}

/* ---------- sections ---------- */
.sec-title{font-size:24px;margin-bottom:22px}
.topics{padding:66px 24px 12px}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:16px}
.grid.three{grid-template-columns:repeat(auto-fit,minmax(220px,1fr))}
.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:24px;transition:.2s}
.card:hover{transform:translateY(-3px);box-shadow:0 10px 24px rgba(18,58,122,.10)}
.card .ic{width:46px;height:46px;border-radius:11px;background:linear-gradient(135deg,var(--accent-soft),#e2f7f5);display:flex;align-items:center;justify-content:center;color:var(--accent);margin-bottom:14px}
.card .ic svg{width:24px;height:24px}
.card h3{font-size:17px;margin-bottom:6px}
.card p{font-size:14px;color:var(--muted)}
.card.slim{padding:22px}
.card.slim h3{color:var(--accent)}
.brief{padding:40px 24px 72px}
.brief-box{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:34px}
.brief-box h2{font-size:22px;margin-bottom:12px}
.brief-box p{color:var(--muted);max-width:760px}
.link{display:inline-block;margin-top:14px;color:var(--accent);font-weight:600}

/* ---------- inner pages ---------- */
.page{padding:52px 24px 72px}
.page-title{font-size:30px;margin-bottom:8px}
.page-sub{color:var(--muted);margin-bottom:28px}

/* qr note on list page */
.qr-note{display:flex;align-items:center;gap:16px;background:var(--card);border:1px solid var(--line);border-radius:14px;padding:14px 18px;margin-bottom:30px}
.qr-note img{border-radius:8px}
.qr-note strong{display:block;font-size:15px}
.qr-note span{font-size:13px;color:var(--muted)}

/* posts */
.posts{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.post{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:24px;cursor:pointer;transition:.2s}
.post:hover{transform:translateY(-3px);box-shadow:0 10px 24px rgba(18,58,122,.10)}
.post .meta{display:flex;align-items:center;gap:10px;margin-bottom:10px}
.tag{font-size:12px;font-weight:600;color:var(--accent);background:var(--accent-soft);padding:3px 10px;border-radius:999px}
.post time{font-size:12px;color:var(--muted)}
.post h2{font-size:18px;line-height:1.45;margin-bottom:10px}
.post .sum{font-size:14px;color:var(--muted)}
.buy{display:flex;align-items:center;gap:14px;margin-top:14px;padding-top:12px;border-top:1px dashed var(--line)}
.price{color:#ff6a00;font-weight:700;font-size:16px}
.more{border:0;background:none;color:var(--accent);font-size:14px;font-weight:600;cursor:pointer;padding:0}
.pay-amount{color:#ff6a00;font-weight:700;font-size:28px;margin-bottom:2px}
.sheet .sub{margin-top:6px;font-size:12px;color:#9aa5b5}

/* modal */
.modal{position:fixed;inset:0;z-index:100;background:rgba(13,20,35,.55);display:flex;align-items:center;justify-content:center;padding:24px}
.modal[hidden]{display:none}
.sheet{position:relative;background:#fff;border-radius:18px;padding:34px 38px;text-align:center;max-width:330px;width:100%;box-shadow:0 24px 60px rgba(0,0,0,.25)}
.sheet h3{font-size:19px;margin-bottom:16px}
.sheet img{margin:0 auto;border-radius:10px}
.sheet p{margin-top:14px;font-size:13px;color:var(--muted)}
.sheet .x{position:absolute;top:10px;right:14px;border:0;background:none;font-size:26px;color:var(--muted);cursor:pointer;line-height:1}

/* about */
.prose{max-width:780px;background:var(--card);border:1px solid var(--line);border-radius:16px;padding:32px;margin-bottom:40px}
.prose p{margin-bottom:14px;color:#2c3646}
.prose p:last-child{margin-bottom:0}

/* contact */
.contact-grid{display:grid;grid-template-columns:1.4fr 1fr;gap:16px;align-items:stretch}
.info{padding:28px 30px}
.info dl .row{display:flex;gap:18px;padding:13px 0;border-bottom:1px dashed var(--line)}
.info dl .row:last-child{border-bottom:0}
.info dt{flex:0 0 84px;color:var(--muted);font-size:14px;padding-top:1px}
.info dd{font-size:15px}
.info dd.todo{color:#9aa5b5}
.qrbox{text-align:center;padding:28px}
.qrbox img{margin:0 auto 14px;border-radius:10px}
.qrbox h3{font-size:16px}
.qrbox p{font-size:13px;color:var(--muted)}

/* ---------- footer ---------- */
.site-footer{background:#0f1524;color:#96a1b5;padding:34px 0}
.foot-row{display:flex;align-items:center;justify-content:space-between;gap:14px;flex-wrap:wrap}
.foot-row .corp{color:#e7ecf5;font-size:15px}
.beian{display:flex;gap:18px;flex-wrap:wrap;font-size:13px}
.beian a:hover{color:#fff}

/* ---------- responsive ---------- */
@media (max-width:860px){
  .posts{grid-template-columns:1fr}
  .contact-grid{grid-template-columns:1fr}
  .hero h1{font-size:32px}
  .nav-row{flex-direction:column;height:auto;padding:12px 0;gap:8px}
}