:root{--ink:#17233b;--muted:#68748a;--line:#dfe6f1;--navy:#173f73;--blue:#1f6feb;--soft:#eaf2ff;--danger:#b42318;--success:#157a4f}*{box-sizing:border-box}body{margin:0;min-width:320px;background:linear-gradient(145deg,#edf5ff,#f7f9fc 45%,#fff);color:var(--ink);font-family:"Microsoft YaHei","PingFang SC",system-ui,sans-serif}button,input{font:inherit}.page-shell{width:min(100% - 32px,860px);margin:auto;padding:56px 0 34px}.hero{display:flex;align-items:center;gap:18px;margin-bottom:26px}.mark{display:grid;place-items:center;width:54px;height:54px;border-radius:16px;background:linear-gradient(145deg,#245c9d,#163762);color:white;font-size:25px;font-weight:800;box-shadow:0 10px 22px #173f7340}.eyebrow{margin:0 0 7px;color:#5a7096;font-size:12px;font-weight:750;letter-spacing:.12em}h1,h2{margin:0;letter-spacing:-.02em}h1{font-size:clamp(28px,4vw,38px)}h2{font-size:21px}.subtitle{margin:8px 0 0;color:var(--muted);font-size:15px}.notice{display:flex;gap:9px;align-items:center;margin-bottom:16px;padding:13px 16px;border:1px solid #f4cf8b;border-radius:12px;background:#fff9e8;color:#75551a;font-size:14px}.notice span{width:8px;height:8px;border-radius:50%;background:#d59b2d}.card{padding:clamp(22px,5vw,38px);border:1px solid #d2ddec;border-radius:20px;background:#ffffffef;box-shadow:0 20px 50px #1f3a671f}.results{margin-top:18px}.heading{display:flex;justify-content:space-between;gap:16px;align-items:flex-start;padding-bottom:22px;border-bottom:1px solid var(--line)}.heading em{padding:6px 10px;border-radius:999px;background:var(--soft);color:var(--navy);font-size:12px;font-style:normal;font-weight:700}.tabs{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin:24px 0;padding:6px;border-radius:12px;background:#f1f4f9}.tab{border:0;border-radius:9px;padding:10px;background:transparent;color:#59677e;font-weight:700}.tab.active{background:#fff;color:var(--navy);box-shadow:0 2px 7px #1f3a671f}label{display:block;margin:16px 0 8px;font-size:14px;font-weight:700}input{width:100%;height:50px;padding:0 14px;border:1px solid #cfd9e9;border-radius:10px;color:var(--ink);outline:none}input:focus{border-color:var(--blue);box-shadow:0 0 0 3px #1f6feb1f}.channel-hint{margin:10px 0 0;padding:9px 11px;border-radius:9px;background:#f3f7fd;color:#536987;font-size:12px;line-height:1.6}.code-row{display:grid;grid-template-columns:1fr auto;gap:10px}.primary,.secondary{min-height:50px;border-radius:10px;font-weight:750;cursor:pointer}.primary{width:100%;margin-top:10px;border:0;background:linear-gradient(135deg,#1e63b0,#17427a);color:#fff;box-shadow:0 10px 18px #173f7333}.secondary{border:1px solid #aac3eb;background:#f7fbff;color:#1f5699;padding:0 14px}.primary:disabled,.secondary:disabled{opacity:.55;cursor:not-allowed}#message{min-height:22px;margin:12px 0 2px;color:var(--muted);font-size:14px}#message.error{color:var(--danger)}#message.success{color:var(--success)}.privacy{display:flex;gap:9px;margin-top:22px;color:#69778c;font-size:13px;line-height:1.55}.link{border:0;background:transparent;color:#4b6590;font-size:13px;font-weight:700;cursor:pointer}.student{display:flex;flex-wrap:wrap;gap:8px;padding:20px 0 16px}.student span{padding:7px 10px;border-radius:8px;background:#f3f6fb;color:#42516b;font-size:13px}.scores{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.score{padding:15px;border:1px solid var(--line);border-radius:12px;background:#fbfcfe}.score small{display:block;color:var(--muted);font-size:12px;margin-bottom:7px}.score strong{color:var(--navy);font-size:20px}footer{display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px 18px;padding:24px 2px 0;color:#7b8798;font-size:12px}@media(max-width:560px){.page-shell{width:min(100% - 24px,860px);padding-top:30px}.mark{width:46px;height:46px}.heading{display:block}.heading em{display:inline-block;margin-top:12px}.code-row,.scores{grid-template-columns:1fr}.secondary{width:100%}}