:root {
    --bg: #0b0d10;
    --glow: #171b21;
    --card: #14171c;
    --line: #23282f;
    --text: #e8eaed;
    --muted: #8b939f;
    --accent: #c08a4a;
    --danger: #e5786d;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 24px;
    background:
        radial-gradient(60rem 40rem at 50% -10%, var(--glow), transparent 70%),
        var(--bg);
    color: var(--text);
    font: 15px/1.5 ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

.card {
    width: 100%;
    max-width: 360px;
    padding: 36px 32px 32px;
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: 16px;
    box-shadow: 0 24px 60px rgb(0 0 0 / 0.45);
    text-align: center;
}

.mark {
    width: 48px;
    height: 48px;
    margin: 0 auto 18px;
    display: grid;
    place-items: center;
    color: var(--accent);
    border: 1px solid var(--line);
    border-radius: 12px;
    background: #191d23;
}
.mark svg { width: 26px; height: 26px; }

h1 {
    margin: 0;
    font-size: 21px;
    font-weight: 600;
    letter-spacing: -0.01em;
}

.sub {
    margin: 4px 0 28px;
    color: var(--muted);
    font-size: 13px;
}

form { text-align: left; }

label {
    display: block;
    margin-bottom: 6px;
    font-size: 12px;
    font-weight: 500;
    color: var(--muted);
}

input {
    width: 100%;
    margin-bottom: 16px;
    padding: 11px 13px;
    color: var(--text);
    background: #0f1216;
    border: 1px solid var(--line);
    border-radius: 9px;
    font: inherit;
    outline: none;
    transition: border-color .15s, box-shadow .15s;
}

input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgb(192 138 74 / 0.15);
}

button {
    width: 100%;
    padding: 11px;
    color: #1a1206;
    background: var(--accent);
    border: 0;
    border-radius: 9px;
    font: inherit;
    font-weight: 600;
    cursor: pointer;
    transition: filter .15s;
}

button:hover:not(:disabled) { filter: brightness(1.08); }
button:disabled { opacity: .6; cursor: default; }

.error {
    margin: -4px 0 14px;
    padding: 9px 11px;
    color: var(--danger);
    background: rgb(229 120 109 / 0.09);
    border: 1px solid rgb(229 120 109 / 0.25);
    border-radius: 8px;
    font-size: 13px;
}