:root{color-scheme:light;--page:#f5f8f7;--surface:#fff;--ink:#203c35;--muted:#53665f;--line:#cedbd6;--accent:#0f766e;--on-accent:#fff;--danger:#a6342a;--tint:#edf7f2}
:root.theme-dark{color-scheme:dark;--page:#101816;--surface:#1b2622;--ink:#edf4f1;--muted:#b7c8bf;--line:#4b6257;--accent:#55d7bf;--on-accent:#08251e;--danger:#ffaaa0;--tint:#223a30}
*{box-sizing:border-box}body{margin:0;background:var(--page);color:var(--ink);font:400 16px/1.5 -apple-system,BlinkMacSystemFont,'Segoe UI','PingFang TC',sans-serif;-webkit-font-smoothing:antialiased}button,input{font:inherit}a{color:var(--accent);text-underline-offset:4px}button{cursor:pointer}button:disabled{cursor:wait;opacity:.55}[hidden]{display:none!important}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}
.auth-shell{width:min(420px,calc(100% - 32px));margin:16px auto;padding-bottom:env(safe-area-inset-bottom)}.auth-top{display:flex;align-items:center;justify-content:space-between;margin:0 4px 12px}.brand{display:flex;align-items:center;gap:8px;color:var(--ink);text-decoration:none;font-size:20px;font-weight:400;letter-spacing:-.015em}.brand img{object-fit:contain}.icon-button{width:44px;height:44px;display:grid;place-items:center;background:transparent;border:1px solid var(--line);border-radius:50%;color:var(--ink)}
.auth-card{padding:20px;background:var(--surface);border:1px solid var(--line);border-radius:16px;box-shadow:0 8px 30px #203c3505}.auth-tabs{display:flex;gap:4px;padding:4px;background:var(--page);border-radius:12px;margin-bottom:16px}.auth-tabs a{display:flex;align-items:center;justify-content:center;flex:1;min-width:0;min-height:44px;padding:8px;color:var(--muted);border-radius:8px;text-decoration:none;font-size:15px;font-weight:500}.auth-tabs a[aria-current=page]{background:var(--surface);color:var(--accent);box-shadow:inset 0 0 0 1px var(--accent)}.auth-tabs a:hover{color:var(--accent)}
form{display:grid;gap:12px}h1{font-size:22px;line-height:1.3;font-weight:500;letter-spacing:-.025em;margin:0}h2{font-size:18px;font-weight:500;margin:0 0 12px}p{margin:0}.muted{color:var(--muted);font-size:13px}.field{display:grid;gap:4px}label{font-size:15px}input:not([type=checkbox]){width:100%;min-width:0;height:44px;border:1px solid var(--line);border-radius:8px;padding:8px 12px;background:var(--surface);color:var(--ink);font-size:16px}input[aria-invalid=true]{border-color:var(--danger)}input::placeholder{color:var(--muted);opacity:1}.password-wrap{position:relative}.password-wrap input{padding-right:64px}.reveal{position:absolute;right:2px;top:0;min-width:54px;min-height:44px;border:0;background:transparent;color:var(--accent);font-size:14px}
.primary{min-height:44px;border:0;border-radius:8px;background:var(--accent);color:var(--on-accent);font-weight:500;width:100%;padding:8px 16px}.primary:hover{filter:brightness(.94)}.field-error,.message{color:var(--danger);font-size:14px;overflow-wrap:anywhere}.field-error:empty,.message:empty,#policyStatus:empty{display:none}.challenge-layout{display:grid;grid-template-columns:196px minmax(0,1fr);gap:8px;align-items:center}.challenge-row{display:flex;gap:8px;align-items:center}.challenge-row img{width:144px;height:auto;aspect-ratio:176/64;border:1px solid var(--line);border-radius:8px;background:#f4f9f7}.refresh-challenge{width:44px;min-width:44px;height:44px;padding:0;font-size:24px;line-height:1;background:var(--surface);color:var(--accent);border:1px solid var(--line);border-radius:8px}.text-button{background:transparent;border:0;color:var(--accent);min-height:44px;padding:8px 0;text-decoration:underline;text-underline-offset:4px;font-size:14px}.auth-link{text-align:center}
#registrationPolicy{display:grid;gap:8px}#policyDetails{border-top:1px solid var(--line);border-bottom:1px solid var(--line)}#policyDetails summary{cursor:pointer;min-height:44px;padding:10px 0;color:var(--ink);font-size:14px}#policyNotices{margin:0;padding:0 0 12px 20px;font-size:14px;line-height:1.6;color:var(--muted)}#policyNotices li+li{margin-top:8px}.consent{display:flex;gap:8px;align-items:flex-start;font-size:14px;line-height:1.5;min-height:44px;padding:4px 0}.consent input{width:20px;height:20px;flex:none;margin:1px 0;accent-color:var(--accent)}
.auth-footer{display:flex;flex-wrap:wrap;gap:4px 12px;justify-content:center;margin-top:8px}.auth-footer a,.auth-footer button{font-size:13px;min-height:44px;padding:12px 0;color:var(--muted)}:focus-visible{outline:2px solid var(--accent);outline-offset:3px}.social{display:grid;gap:8px}.social a{display:flex;align-items:center;justify-content:center;gap:12px;min-height:44px;border:1px solid var(--line);border-radius:8px;text-decoration:none;font-size:15px}.social svg{width:20px;height:20px}.divider{text-align:center;color:var(--muted);font-size:13px}
@media(min-width:700px) and (min-height:800px){.auth-shell{margin-top:32px}}@media(max-width:480px){.auth-shell{margin:8px auto}.auth-top{margin-bottom:8px}.auth-card{padding:16px}.auth-tabs{margin-bottom:12px}form{gap:8px}}@media(max-width:360px){.auth-card{padding:12px}.challenge-layout{grid-template-columns:1fr}.challenge-row{justify-content:space-between}.challenge-row img{width:176px}.auth-tabs a{font-size:14px}.auth-footer{gap:4px 8px}}

@media(max-height:650px){.auth-shell{margin:4px auto}.auth-top{margin-bottom:4px}.auth-card{padding:12px}.auth-tabs{margin-bottom:8px}form{gap:8px}}