:root {
    color-scheme: light dark;
    --bg: #fff;
    --card-bg: #fff;
    --surface-2: #f7f8fa;
    --text: #333;
    --text-body: #444;
    --heading: #1a1a2e;
    --muted: #777;
    --accent: #8c1916;
    --btn-bg: #8c1916;
    --btn-bg-hover: #701411;
    --btn-text: #fff;
    --border: #dde2ea;
    --shadow-1: rgba(0, 0, 0, 0.05);
    --st-good: #0ca30c;
    --st-warning: #c98500;
    --st-critical: #d03b3b;
    --st-info: #2a78d6;
}
@media (prefers-color-scheme: dark) {
    :root {
        --bg: #15171b;
        --card-bg: #1c1f25;
        --surface-2: #21252c;
        --text: #d3d7dd;
        --text-body: #c6cbd2;
        --heading: #eef1f5;
        --muted: #99a1ab;
        --accent: #ef8781;
        --btn-bg: #a5231f;
        --btn-bg-hover: #c22b26;
        --border: #2b3038;
        --shadow-1: rgba(0, 0, 0, 0.40);
        --st-good: #3cc43c;
        --st-warning: #fab219;
        --st-critical: #e66767;
        --st-info: #5598e7;
    }
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
body {
    margin: 0;
    background: var(--bg);
    color: var(--text-body);
    font: 15px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    -webkit-text-size-adjust: 100%;
}
.gate {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
}
.gate .card { width: 100%; max-width: 300px; }
.gate input {
    width: 100%; padding: 11px 13px; font: inherit; font-size: 16px;
    background: var(--card-bg); color: var(--text);
    border: 1px solid var(--border); border-radius: 7px;
    box-shadow: 0 1px 3px var(--shadow-1);
    transition: border-color 120ms, opacity 120ms;
}
.gate input:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; border-color: var(--accent); }
.gate input.is-busy { opacity: 0.55; cursor: progress; }
.gate input.is-bad { border-color: var(--st-critical); animation: nope 260ms ease-in-out; }
@keyframes nope {
    0%, 100% { transform: translateX(0); }
    20% { transform: translateX(-6px); }
    40% { transform: translateX(5px); }
    60% { transform: translateX(-3px); }
    80% { transform: translateX(2px); }
}
@media (prefers-reduced-motion: reduce) {
    .gate input.is-bad { animation: none; }
    .gate input { transition: none; }
}