:root{color-scheme:light;--bg:#f4f6f8;--paper:rgba(255,255,255,0.82);--paper-strong:#fbfcfd;--text:#1d2329;--muted:#69727d;--line:rgba(164,176,190,0.22);--line-strong:rgba(111,125,141,0.26);--brand:#2d5b9f;--brand-strong:#21477d;--brand-soft:rgba(45,91,159,0.08);--secondary:#5d7188;--secondary-soft:rgba(93,113,136,0.08);--success:#1d7a62;--warning:#a06b2a;--danger:#b04444;--shadow:0 18px 48px rgba(22,28,36,0.05);--radius-xl:24px;--radius-lg:18px;--radius-md:12px;--radius-sm:8px;--font-sans:"PingFang SC","Hiragino Sans GB","Noto Sans SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;--font-mono:"SFMono-Regular","JetBrains Mono","Fira Code",Consolas,"Liberation Mono",monospace;--text-display:32px;--text-title:22px;--text-body:15px;--text-meta:12px;--text-label:14px}*{box-sizing:border-box}body,html{margin:0;min-height:100%;background:radial-gradient(circle at top left,rgba(45,91,159,.08),transparent 18%),radial-gradient(circle at bottom right,rgba(134,153,172,.12),transparent 20%),var(--bg);color:var(--text);font-family:var(--font-sans);font-size:var(--text-body);line-height:1.6}button,input,select,textarea{font:inherit}a{color:inherit;text-decoration:none}.auth-panel{display:grid;grid-gap:22px;gap:22px;width:min(520px,calc(100vw - 32px));margin:min(12vh,120px) auto;padding:32px;border:1px solid rgba(255,255,255,.7);border-radius:28px;background:rgba(252,253,255,.86);box-shadow:var(--shadow);-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px)}.auth-copy{display:grid;grid-gap:10px;gap:10px}.auth-kicker{color:var(--muted);font-size:var(--text-meta);font-weight:700;letter-spacing:.04em}.auth-copy h1{margin:0;font-size:var(--text-display);line-height:1.15;letter-spacing:-.04em}.auth-copy p{margin:0;color:var(--muted);font-size:var(--text-body);line-height:1.55}.auth-form{display:grid;grid-gap:14px;gap:14px}.auth-form label{display:grid;grid-gap:8px;gap:8px;font-size:var(--text-label);font-weight:600}.auth-form input{width:100%;min-height:52px;padding:0 16px;border:1px solid var(--line);border-radius:16px;background:rgba(255,255,255,.96);color:var(--text);font-size:var(--text-body)}.auth-form button{min-height:48px;border:1px solid rgba(45,91,159,.16);border-radius:999px;background:rgba(45,91,159,.92);color:#fff;font-size:var(--text-label);font-weight:700;cursor:pointer}.auth-form button:disabled{cursor:not-allowed;opacity:.6}.auth-form .auth-switch{border:none;background:transparent;color:var(--brand)}.auth-error{color:var(--danger);font-size:var(--text-label);font-weight:600}