.auth-shell {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    background: var(--bg);
    color: var(--text);
}

.auth-card {
    width: min(420px, 100%);
    padding: 22px;
    border: 1px solid var(--border);
    border-radius: 16px;
    background: color-mix(in srgb, var(--surface) 88%, transparent);
    box-shadow: var(--shadow-soft);
}

.auth-header {
    margin-bottom: 14px;
}

.auth-brand {
    font-size: 22px;
    font-weight: 800;
    letter-spacing: .5px;
    color: var(--text);
}

.auth-subtitle {
    color: var(--muted);
    margin-top: 2px;
}

.auth-field {
    margin: 12px 0;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.auth-label {
    font-size: 13px;
    color: var(--muted);
}

.auth-input {
    padding: 10px 12px;
    border-radius: 12px;
    border: 1px solid var(--border);
    background: var(--surface-2);
    color: var(--text);
    outline: none;
    transition: border-color .15s ease, box-shadow .15s ease, background-color .15s ease, color .15s ease;
}

    .auth-input::placeholder {
        color: var(--muted);
        opacity: 1;
    }

    .auth-input:focus {
        border-color: color-mix(in srgb, var(--primary) 70%, var(--border));
        box-shadow: 0 0 0 4px color-mix(in srgb, var(--primary) 18%, transparent);
    }

.auth-btn {
    margin-top: 14px;
    width: 100%;
    padding: 11px 12px;
    border-radius: 12px;
    border: 1px solid color-mix(in srgb, var(--primary) 35%, var(--border));
    background: color-mix(in srgb, var(--primary) 12%, var(--surface-2));
    color: var(--text);
    cursor: pointer;
    font-weight: 700;
    transition: background-color .15s ease, border-color .15s ease, color .15s ease, opacity .15s ease, transform .05s ease;
}

    .auth-btn:hover {
        background: color-mix(in srgb, var(--primary) 18%, var(--surface-2));
    }

    .auth-btn:active {
        transform: translateY(1px);
    }

    .auth-btn:disabled {
        opacity: .7;
        cursor: not-allowed;
    }

.auth-error {
    margin-top: 10px;
    padding: 10px 12px;
    border-radius: 12px;
    background: color-mix(in srgb, var(--danger) 10%, transparent);
    border: 1px solid color-mix(in srgb, var(--danger) 28%, var(--border));
    color: var(--text);
}

.auth-hint {
    margin-top: 12px;
    font-size: 12px;
    color: var(--muted);
    line-height: 1.35;
}

.auth-spinner {
    width: 14px;
    height: 14px;
    border-radius: 50%;
    border: 2px solid color-mix(in srgb, var(--text) 35%, transparent);
    border-top-color: var(--text);
    display: inline-block;
    vertical-align: middle;
    margin-right: 8px;
    animation: spin .8s linear infinite;
}

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