:root {
    --bg-1: #202318;
    --bg-2: #12140c;
    --card: #ffffff;
    --text: #1f2318;
    --text-muted: #6b7280;
    --border: #e7e5df;
    --field-bg: #faf9f5;
    --brand: #f18a1a;
    --brand-hover: #d9770c;
    --brand-soft: #fff4e6;
    --accent: #acd253;
    --accent-dark: #8fb93a;
    --accent-soft: #f4f9e8;
    --accent-border: #d9e9b0;
    --danger: #dc2626;
    --danger-hover: #b91c1c;
    --danger-soft: #fef2f2;
    --danger-border: #fecaca;
    --ok: #6b9e1e;
    --ok-soft: #f4f9e8;
    --ok-border: #d9e9b0;
    --radius: 16px;
    --shadow: 0 20px 45px -15px rgba(0, 0, 0, .5);
}

* { box-sizing: border-box; }

html, body { height: 100%; }

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
        "Helvetica Neue", "PingFang TC", "Microsoft JhengHei", Arial, sans-serif;
    color: var(--text);
    background:
        radial-gradient(900px 500px at 82% -12%, rgba(241, 138, 26, .30), transparent 60%),
        radial-gradient(800px 500px at 12% 112%, rgba(172, 210, 83, .22), transparent 60%),
        linear-gradient(160deg, var(--bg-1), var(--bg-2));
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    -webkit-font-smoothing: antialiased;
}

.card {
    width: 100%;
    max-width: 520px;
    background: var(--card);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    overflow: hidden;
}

.card__header {
    padding: 28px 32px 22px;
    text-align: center;
    border-bottom: 1px solid var(--border);
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    letter-spacing: .3px;
    color: var(--brand);
    margin-bottom: 14px;
}

.brand__logo {
    width: 28px;
    height: 28px;
    border-radius: 8px;
    object-fit: contain;
    display: block;
}

.card__header h1 {
    margin: 0;
    font-size: 22px;
    font-weight: 700;
}

.card__header p {
    margin: 8px 0 0;
    color: var(--text-muted);
    font-size: 14px;
}

.card__body { padding: 26px 32px 8px; }

.section-title {
    font-size: 13px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .6px;
    color: var(--text-muted);
    margin: 22px 0 12px;
}

.warn {
    background: var(--danger-soft);
    border: 1px solid var(--danger-border);
    border-radius: 12px;
    padding: 14px 16px;
    display: grid;
    gap: 10px;
}

.warn__item {
    display: flex;
    gap: 10px;
    font-size: 14px;
    line-height: 1.5;
    color: #7f1d1d;
}

.warn__item svg { flex: 0 0 18px; margin-top: 2px; }

.steps {
    list-style: none;
    counter-reset: step;
    margin: 0;
    padding: 0;
    display: grid;
    gap: 10px;
}

.steps li {
    counter-increment: step;
    display: flex;
    gap: 12px;
    font-size: 14px;
    line-height: 1.5;
    color: var(--text);
}

.steps li::before {
    content: counter(step);
    flex: 0 0 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--accent-soft);
    border: 1px solid var(--accent-border);
    color: var(--accent-dark);
    font-size: 12px;
    font-weight: 700;
    display: grid;
    place-items: center;
}

.field { margin-bottom: 16px; }

.field label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 6px;
}

.field input[type="text"],
.field input[type="password"] {
    width: 100%;
    padding: 12px 14px;
    font-size: 15px;
    color: var(--text);
    background: var(--field-bg);
    border: 1px solid var(--border);
    border-radius: 10px;
    outline: none;
    transition: border-color .15s, box-shadow .15s, background .15s;
}

.field input:focus {
    border-color: var(--brand);
    background: #fff;
    box-shadow: 0 0 0 3px rgba(241, 138, 26, .18);
}

.confirm {
    display: flex;
    gap: 10px;
    align-items: flex-start;
    background: var(--field-bg);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 12px 14px;
    font-size: 13.5px;
    line-height: 1.5;
    color: var(--text);
    cursor: pointer;
    margin: 4px 0 18px;
}

.confirm input {
    width: 18px;
    height: 18px;
    margin-top: 1px;
    accent-color: var(--brand);
    cursor: pointer;
}

.msg {
    display: none;
    border-radius: 10px;
    padding: 12px 14px;
    font-size: 14px;
    margin-bottom: 16px;
    line-height: 1.45;
}

.msg--error {
    display: block;
    background: var(--danger-soft);
    border: 1px solid var(--danger-border);
    color: #7f1d1d;
}

.msg--ok {
    display: block;
    background: var(--ok-soft);
    border: 1px solid var(--ok-border);
    color: #14532d;
}

.btn {
    width: 100%;
    padding: 14px 18px;
    font-size: 15px;
    font-weight: 700;
    color: #fff;
    background: linear-gradient(135deg, var(--brand), var(--brand-hover));
    border: none;
    border-radius: 12px;
    cursor: pointer;
    box-shadow: 0 8px 18px -8px rgba(241, 138, 26, .7);
    transition: filter .15s, transform .05s, box-shadow .15s;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.btn:hover { filter: brightness(1.06); }
.btn:active { transform: translateY(1px); }

.btn:disabled {
    background: #f5c896;
    box-shadow: none;
    cursor: not-allowed;
}

.spinner {
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255, 255, 255, .5);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin .7s linear infinite;
    display: none;
}

.btn.is-loading .spinner { display: inline-block; }

@keyframes spin { to { transform: rotate(360deg); } }

.card__footer {
    padding: 16px 32px 24px;
    text-align: center;
    font-size: 12px;
    color: var(--text-muted);
}

@media (max-width: 480px) {
    .card__header, .card__body, .card__footer { padding-left: 20px; padding-right: 20px; }
}

@media (prefers-color-scheme: dark) {
    :root {
        --card: #1a1c14;
        --text: #ededdf;
        --text-muted: #a3a394;
        --border: #35382b;
        --field-bg: #23261b;
        --brand-soft: #3a2a12;
        --accent-soft: #26301a;
        --accent-border: #46551f;
        --accent-dark: #bcdd6a;
        --danger-soft: #2a1414;
        --danger-border: #7f1d1d;
        --ok-soft: #26301a;
        --ok-border: #46551f;
    }
    .field input:focus { background: #14160e; }
    .warn__item { color: #fecaca; }
    .msg--error { color: #fecaca; }
    .msg--ok { color: #d6ea9f; }
}