:root{--accent:#1560c8;--accent-dark:#0f4aa0;--accent-soft:#e8f0fb;--bg:#f5f7fa;--card:#ffffff;--text:#1a2233;--muted:#5b6676;--border:#e2e8f0;--danger:#c0344a;--radius:12px;--shadow:0 1px 3px rgba(16,24,40,0.06),0 1px 2px rgba(16,24,40,0.04)}*{box-sizing:border-box}body,html{margin:0;padding:0}body{font-family:system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;color:var(--text);background:var(--bg);line-height:1.6;display:flex;flex-direction:column;min-height:100vh}.container{width:100%;max-width:640px;margin:0 auto;padding:0 20px}.site-header{background:var(--card);border-bottom:1px solid var(--border)}.site-header .container{display:flex;align-items:center;height:56px}.brand{font-weight:700;font-size:18px;color:var(--accent);letter-spacing:.2px}.brand:before{content:"";display:inline-block;width:10px;height:10px;margin-right:8px;border-radius:50%;background:var(--accent);vertical-align:middle}main.page{flex:1 0 auto;padding-top:32px;padding-bottom:40px}.site-footer{border-top:1px solid var(--border);color:var(--muted);font-size:13px;padding:16px 0}h1{font-size:24px;margin:0 0 16px}h2{font-size:18px}h2,p{margin:0 0 12px}a{color:var(--accent)}.stack>*{margin:0}.stack>*+*{margin-top:14px}.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:24px}.btn{display:inline-block;border:none;border-radius:8px;background:var(--accent);color:#fff;font-size:15px;font-weight:600;padding:10px 18px;cursor:pointer;text-decoration:none;transition:background .15s ease}.btn:hover{background:var(--accent-dark)}.btn:disabled{opacity:.6;cursor:not-allowed}.btn-block{display:block;width:100%;text-align:center}.input{width:100%;padding:10px 12px;font-size:15px;border:1px solid var(--border);border-radius:8px;background:#fff;color:var(--text)}.input:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}.muted{color:var(--muted)}.error{color:var(--danger)}.course-list{list-style:none;margin:0;padding:0}.course-list li{padding:12px 14px;border:1px solid var(--border);border-radius:8px;background:#fff;margin-bottom:8px;font-weight:500}.course-list li:last-child{margin-bottom:0}.badge{display:inline-block;padding:3px 10px;border-radius:999px;font-size:13px;font-weight:600}.badge-paid{background:#e6f6ec;color:#1a7f43}.badge-pending{background:var(--accent-soft);color:var(--accent-dark)}.notice-dev{border:2px dashed #d97706;background:#fffbeb;border-radius:var(--radius);padding:16px}.notice-dev-title{margin:0;font-weight:700;color:#b45309}.notice-dev-sub{margin:4px 0 0;font-size:13px;color:#92400e}.pay-amount{font-size:26px;font-weight:700;margin:0}@media (max-width:480px){.container{padding:0 16px}.card{padding:18px}h1{font-size:21px}}