*{box-sizing:border-box}
body{font-family:Inter,system-ui,-apple-system,"PingFang SC","Microsoft YaHei",Arial,sans-serif;background:#f5f6fb;color:#141722;margin:0}
a{text-decoration:none;color:inherit}

/* keep old pages usable */
.container{max-width:920px;margin:0 auto;padding:32px}
.form{display:flex;flex-direction:column;gap:10px;background:#fff;padding:20px;border-radius:12px;box-shadow:0 6px 20px rgba(0,0,0,.05)}
input,select{padding:10px;border:1px solid #ddd;border-radius:8px}
.error{color:#dc2626}
.ok{color:#16a34a}

.landing-page .topbar{position:sticky;top:0;background:#fff;border-bottom:1px solid #eceef5;z-index:10}
.top-inner{max-width:1160px;margin:0 auto;padding:14px 20px;display:flex;justify-content:space-between;align-items:center}
.brand{font-weight:800;font-size:24px;display:flex;gap:8px;align-items:center;color:#2a2b4a}
.top-nav{display:flex;gap:20px;font-size:14px;color:#5a6180}
.top-nav a:hover{color:#4f46e5}
.user-pill{display:inline-block;padding:6px 10px;border-radius:999px;background:#eef1ff;color:#4f46e5;font-size:12px;font-weight:700}
.logout-link{border:none;background:transparent;color:#5a6180;cursor:pointer;font-size:14px;padding:0}
.logout-link:hover{color:#4f46e5}
.admin-link{padding:6px 10px;border-radius:999px;background:#eef1ff;color:#4f46e5}

.hero-wrap{max-width:920px;margin:46px auto 20px;text-align:center;padding:0 16px}
.badge{display:inline-block;padding:8px 16px;border-radius:999px;background:#efecff;color:#5a49d9;font-weight:700;font-size:13px}
.hero-wrap h1{font-size:72px;line-height:1.05;margin:20px 0 6px;font-weight:900;color:#161a2d}
.hero-wrap h1 span{color:#5e4bff}
.hero-wrap h2{font-size:36px;margin:0 0 12px;color:#21253a}
.sub{font-size:20px;color:#767c95;margin:0}
.safe{margin:18px auto 8px;display:inline-block;padding:8px 14px;background:#ebfff0;color:#17a24f;border-radius:10px;font-weight:700}
.chip-row{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin:18px 0}
.chip-row span{padding:9px 14px;background:#fff;border:1px solid #e8eaf3;border-radius:999px;color:#636b86;font-weight:600}
.hero-cta{display:flex;justify-content:center;gap:12px;flex-wrap:wrap;margin-top:14px}
.btn{display:inline-block;padding:14px 28px;border-radius:999px;font-weight:800}
.btn-main{background:linear-gradient(135deg,#4f5dff,#8b3df2);color:#fff;box-shadow:0 10px 24px rgba(95,77,255,.28)}
.btn-ghost{background:#fff;color:#60698a;border:1px solid #e6e8f2}
.btn-warm{background:linear-gradient(135deg,#ffb300,#ff6f00);color:#fff;box-shadow:0 10px 24px rgba(255,165,0,.22)}
.btn.full{display:block;text-align:center;margin-top:18px}
.pay-tags{margin-top:16px;color:#7b839f;font-size:14px}
.pay-tags span{background:#fff;border:1px solid #eaedf7;padding:6px 12px;border-radius:8px;margin:0 4px;color:#5e6686}

.section{max-width:1160px;margin:80px auto 0;padding:0 20px;text-align:center}
.section h3{font-size:54px;margin:0;color:#111831}
.section-sub{font-size:20px;color:#7a819d;margin:10px 0 28px}

.feature-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:24px}
.feature-card{background:#fff;border-radius:18px;padding:28px 20px;box-shadow:0 10px 28px rgba(17,24,49,.08)}
.feature-card .icon{font-size:34px;margin-bottom:10px}
.feature-card h4{font-size:30px;margin:0 0 8px;color:#1c2138}
.feature-card p{font-size:17px;color:#737b97;line-height:1.5;margin:0}

.tutorial-box{background:#fff;border-radius:20px;padding:22px;font-size:22px;color:#555f82;box-shadow:0 12px 30px rgba(0,0,0,.06)}
.tutorial-link{display:inline-block;margin-top:10px;color:#4f46e5;font-weight:700}

.article-page{background:#f5f6fb}
.article-wrap{max-width:900px;margin:36px auto 60px;padding:0 16px}
.article-head{text-align:center;margin-bottom:24px}
.article-badge{display:inline-block;padding:6px 12px;border-radius:999px;background:#ece9ff;color:#5d4af0;font-weight:700;font-size:12px}
.article-head h1{font-size:42px;margin:12px 0 8px;color:#111831}
.article-head p{font-size:18px;color:#717a98;margin:0}
.article-card{background:#fff;border-radius:18px;padding:24px;margin-bottom:16px;box-shadow:0 10px 28px rgba(17,24,49,.08)}
.article-card h2{font-size:28px;margin:0 0 10px;color:#1a1f36}
.article-card p{font-size:16px;color:#586181;line-height:1.7}
.article-card ul{margin:8px 0 16px 18px;color:#4f5878}
.tip{padding:10px 12px;border-radius:10px;background:#eefcf2;color:#1f8f4a;font-weight:700}


.plan-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px;text-align:left}
.plan-card{background:#fff;border-radius:22px;padding:28px;border:2px solid #ece9ff;box-shadow:0 10px 28px rgba(16,21,42,.08)}
.plan-card.yearly{background:#fffaf1;border-color:#ffe0a8}
.plan-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:10px}
.plan-top span{font-size:24px;font-weight:800;color:#646cf0}
.plan-top b{font-size:13px;background:#ff8f8f;color:#fff;padding:5px 10px;border-radius:999px}
.plan-card h4{font-size:48px;margin:10px 0;color:#151a32}
.plan-card p{font-size:20px;color:#77809f;margin:0 0 16px}
.money{font-size:66px;font-weight:900;color:#151c33}
.yearly .money{color:#ff9800}
.money small{font-size:22px;color:#6f7796;font-weight:700}
.plan-card ul{list-style:none;padding:0;margin:14px 0 0}
.plan-card li{font-size:20px;color:#4d5679;line-height:1.8}

.stats{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:20px;margin-top:60px}
.stats strong{display:block;font-size:52px;color:#4f46e5}
.stats span{font-size:18px;color:#77809b}

.footer{max-width:1160px;margin:70px auto 30px;padding:30px 20px;border-top:1px solid #e8ebf5;display:grid;grid-template-columns:1.3fr 1fr 1fr;gap:26px;color:#616a8b}
.footer h5{margin:0 0 10px;font-size:26px;color:#1c2240}
.footer p,.footer a{display:block;margin:5px 0;font-size:16px}

.auth-page{min-height:100vh;display:flex;align-items:center;justify-content:center;background:#f5f6fb;padding:20px}
.auth-card{width:100%;max-width:440px;background:#fff;border-radius:16px;padding:24px;box-shadow:0 10px 28px rgba(17,24,49,.08)}
.auth-card h1{margin:0 0 8px;color:#10162d}
.auth-card p{color:#6d7594}

.checkout-wrap{max-width:960px;margin:36px auto;padding:0 16px}
.checkout-wrap h1{font-size:46px;margin:0 0 18px;color:#121933}
.checkout-card{background:#fff;border-radius:16px;padding:20px;border:1px solid #eceff8;box-shadow:0 8px 24px rgba(18,24,44,.06);display:flex;flex-direction:column;gap:10px}
.stock-tip{font-size:14px;color:#6d7594;margin-top:2px}
.checkout-btn{margin-top:8px;border:2px solid #111;background:#fff;color:#111;font-weight:800}
.checkout-btn:disabled{opacity:.6;cursor:not-allowed}

.pay-wrap{max-width:980px;margin:36px auto;padding:0 16px;text-align:center}
.pay-wrap h1{font-size:42px;margin:0 0 8px;color:#121a33}
.pay-card{margin-top:16px;background:#fff;border-radius:18px;padding:20px;display:grid;grid-template-columns:320px 1fr;gap:20px;align-items:center;box-shadow:0 10px 28px rgba(17,24,49,.08)}
.qr-box{display:flex;justify-content:center}
.qr-inner{width:260px;height:260px;border:8px solid #111;border-radius:14px;display:flex;align-items:center;justify-content:center;flex-direction:column;font-weight:800;color:#222;background:repeating-linear-gradient(45deg,#fff,#fff 10px,#f1f3fa 10px,#f1f3fa 20px)}
.qr-inner span{font-size:12px;margin-top:8px;word-break:break-all;padding:0 8px}
.pay-info{text-align:left;color:#4f5878}
.pay-info p{margin:8px 0}

.success-page{min-height:100vh;display:flex;align-items:center;justify-content:center;background:#f5f6fb;padding:20px}
.success-card{width:100%;max-width:760px;background:#fff;border-radius:20px;padding:30px;box-shadow:0 12px 30px rgba(17,24,49,.08);text-align:center}
.success-card h1{margin:0 0 10px;color:#111a33}
.key-box{margin:18px 0;background:#f4f2ff;border:1px solid #dbd5ff;border-radius:14px;padding:14px}
.key-title{font-size:13px;color:#6a63a1;margin-bottom:8px}
.key-value{font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;font-size:20px;font-weight:800;color:#4f46e5;word-break:break-all}

.orders-wrap{max-width:980px;margin:32px auto 50px;padding:0 16px}
.orders-wrap h1{font-size:42px;color:#131a33;margin:0 0 18px}
.join-card{background:#eef0ff;border:1px solid #dce1ff;padding:18px;border-radius:14px;display:flex;justify-content:space-between;align-items:center;gap:14px}
.join-card strong{font-size:20px;color:#2f3ea6}
.join-card p{margin:6px 0 0;color:#6c7598}
.order-query{display:flex;gap:10px;margin:20px 0}
.order-query input{flex:1;background:#fff}
.empty-box{margin:50px auto;text-align:center;color:#8088a6}
.empty-icon{font-size:52px;margin-bottom:6px}
.orders-table-wrap{overflow:auto;background:#fff;border-radius:14px;box-shadow:0 8px 20px rgba(18,24,44,.08)}
.orders-table{width:100%;border-collapse:collapse;min-width:780px}
.orders-table th,.orders-table td{padding:12px 14px;border-bottom:1px solid #edf0f8;text-align:left;font-size:14px}
.orders-table th{background:#f8f9fd;color:#5a6383;font-weight:700}
.status{display:inline-block;padding:4px 10px;border-radius:999px;font-weight:700;font-size:12px}
.status.paid{background:#e8f8ee;color:#1e9a4d}
.status.pending{background:#fff6dd;color:#c77700}
.status.failed{background:#ffe9ea;color:#cc2f3b}

.admin-page{background:#f5f6fb}
.admin-wrap{max-width:1160px;margin:28px auto 40px;padding:0 16px}
.admin-head h1{margin:0;font-size:38px;color:#111831}
.admin-head p{margin:8px 0 18px;color:#6f7898}
.admin-stats{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}
.admin-stat-card{background:#fff;border-radius:16px;padding:22px;box-shadow:0 10px 26px rgba(17,24,49,.08);border:1px solid #eceff8}
.admin-stat-card .label{font-size:14px;color:#707997}
.admin-stat-card .value{font-size:42px;font-weight:900;color:#4f46e5;margin:6px 0}
.admin-stat-card .hint{font-size:13px;color:#8a92ad}
.admin-filter{display:flex;gap:10px;align-items:flex-end;background:#fff;border:1px solid #eceff8;border-radius:14px;padding:14px;margin-bottom:14px}
.admin-filter label{font-size:13px;color:#727b99;min-width:72px}
.admin-filter select{min-width:180px}
.admin-table-wrap{overflow:auto;background:#fff;border-radius:14px;box-shadow:0 8px 20px rgba(18,24,44,.08)}
.admin-table{width:100%;border-collapse:collapse;min-width:980px}
.admin-table th,.admin-table td{padding:12px 14px;border-bottom:1px solid #edf0f8;text-align:left;font-size:14px}
.admin-table th{background:#f8f9fd;color:#5a6383;font-weight:700}
.admin-inline-form{display:flex;gap:8px;align-items:center}
.admin-split{display:grid;grid-template-columns:360px 1fr;gap:14px}
.admin-form{background:#fff;border:1px solid #eceff8;border-radius:14px;padding:14px;display:flex;flex-direction:column;gap:8px}
.admin-form textarea{width:100%;border:1px solid #ddd;border-radius:8px;padding:10px;resize:vertical;min-height:180px}

@media (max-width: 980px){
  .hero-wrap h1{font-size:46px}
  .hero-wrap h2{font-size:26px}
  .sub{font-size:16px}
  .feature-grid{grid-template-columns:1fr 1fr}
  .plan-grid{grid-template-columns:1fr}
  .stats{grid-template-columns:1fr 1fr}
  .footer{grid-template-columns:1fr}
  .section h3{font-size:38px}
  .feature-card h4{font-size:24px}
  .plan-card h4{font-size:36px}
  .money{font-size:50px}
  .join-card{flex-direction:column;align-items:flex-start}
  .order-query{flex-direction:column}
  .admin-stats{grid-template-columns:1fr}
  .admin-filter{flex-direction:column;align-items:stretch}
  .admin-split{grid-template-columns:1fr}
}