:root{color:#17324d;font-synthesis:none;background:#eef4f8;font-family:Inter,PingFang SC,Microsoft YaHei,sans-serif}*{box-sizing:border-box}body{background:linear-gradient(160deg,#e8f2f4,#f7f8f5 54%,#e9f0f6);min-width:320px;margin:0}button,input{font:inherit}.shell{width:min(100% - 32px,520px);padding:28px 0 calc(40px + env(safe-area-inset-bottom));margin:0 auto}.hero{justify-content:space-between;align-items:flex-start;margin-bottom:22px;display:flex}.eyebrow{color:#167c79;letter-spacing:.16em;margin:0 0 5px;font-size:12px;font-weight:800}h1,h2,h3,p{margin-top:0}h1{letter-spacing:.01em;margin-bottom:7px;font-size:32px;line-height:1.1}h2{margin-bottom:18px;font-size:18px}.subtitle{color:#60758b;margin-bottom:0;font-size:14px;line-height:1.55}.server-dot{background:#2ca889;border-radius:50%;width:12px;height:12px;margin-top:8px;box-shadow:0 0 0 6px #d8f0e9}.course-card,.panel{background:#ffffffdb;border:1px solid #d8e3eb;border-radius:16px;box-shadow:0 10px 30px #28496014}.form-panel{padding:20px}form,label{gap:8px;display:grid}form{gap:15px}label{color:#516a7f;font-size:13px;font-weight:650}input{color:#17324d;background:#f9fcfd;border:1px solid #c8d8e3;border-radius:11px;outline:none;width:100%;min-height:48px;padding:0 13px}input:focus{border-color:#159189;box-shadow:0 0 0 3px #15918921}button{cursor:pointer;border:0;border-radius:11px;min-height:46px;font-weight:750}button:disabled{cursor:wait;opacity:.58}.primary-button{color:#fff;background:#147f7e;margin-top:4px;box-shadow:0 6px 14px #147f7e33}.status{border-radius:10px;margin:15px 2px;padding:12px 14px;font-size:13px;line-height:1.45}.status-neutral{color:#43647b;background:#eaf3f6}.status-success{color:#126852;background:#e4f5ed}.status-error{color:#963f43;background:#fbe9e8}.course-section{margin-top:24px}.section-heading{justify-content:space-between;align-items:baseline;display:flex}.section-heading span{color:#7790a2;font-size:13px}.course-list{gap:12px;display:grid}.course-card{padding:16px}.course-topline{justify-content:space-between;align-items:flex-start;gap:10px;display:flex}.course-topline h3{margin-bottom:6px;font-size:16px;line-height:1.35}.status-chip{color:#176b63;background:#e0f2ec;border-radius:999px;flex:none;padding:4px 8px;font-size:11px;font-weight:700}.course-meta,.course-time{color:#6c8293;margin-bottom:8px;font-size:13px}.course-time span{color:#304f67;font-variant-numeric:tabular-nums;margin-left:8px}.sign-button{color:#126c72;background:#e4f3f4;width:100%;margin-top:6px}.empty{color:#7790a2;text-align:center;margin:30px 0;font-size:13px}@media (width<=360px){.shell{width:min(100% - 24px,520px);padding-top:20px}h1{font-size:28px}.form-panel{padding:16px}}