:root {
    --bg: #0c1117;
    --bg-elevated: #141b24;
    --border: #243041;
    --text: #e8eef5;
    --text-muted: #8b9bb0;
    --accent: #3db8a8;
    --accent-dim: rgba(61, 184, 168, 0.15);
    --danger: #f07178;
    --radius: 6px;
    --font: "IBM Plex Sans", "Segoe UI", sans-serif;
}
* { box-sizing: border-box; touch-action: manipulation; }
html, body { height: 100%; margin: 0; }
body {
    background:
        radial-gradient(ellipse 80% 50% at 10% -10%, rgba(61, 184, 168, 0.08), transparent 50%),
        radial-gradient(ellipse 60% 40% at 100% 0%, rgba(70, 120, 180, 0.06), transparent 45%),
        var(--bg);
    color: var(--text);
    font-family: var(--font);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1.25rem;
}
.card {
    width: 100%;
    max-width: 22rem;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 1.5rem 1.35rem 1.35rem;
    box-shadow: 0 18px 40px rgba(0, 0, 0, 0.35);
}
.brand {
    display: flex;
    align-items: center;
    gap: 0.45rem;
    margin: 0 0 0.35rem;
    font-size: 1.35rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}
.brand img {
    height: 1.25em;
    width: auto;
    display: block;
}
.brand span { color: var(--accent); }
.sub {
    margin: 0 0 1.15rem;
    color: var(--text-muted);
    font-size: 0.82rem;
}
label {
    display: block;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
    margin: 0 0 0.3rem;
}
input {
    width: 100%;
    margin: 0 0 0.85rem;
    padding: 0.55rem 0.7rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: #0c1117;
    color: var(--text);
    font-family: var(--font);
    font-size: 0.95rem;
}
input:focus {
    outline: none;
    border-color: var(--accent);
}
button {
    width: 100%;
    margin-top: 0.25rem;
    padding: 0.6rem 0.8rem;
    border: 1px solid var(--accent);
    border-radius: var(--radius);
    background: var(--accent-dim);
    color: var(--accent);
    font-family: var(--font);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
}
button:hover { background: var(--accent); color: #0c1117; }
button:disabled { opacity: 0.45; cursor: default; pointer-events: none; }
.err {
    display: none;
    margin: 0 0 0.85rem;
    padding: 0.5rem 0.65rem;
    border: 1px solid var(--danger);
    border-radius: var(--radius);
    color: var(--danger);
    font-size: 0.8rem;
}
.err.visible { display: block; }