.login-screen {
    position: fixed;
    inset: 0;
    z-index: 1000;
    display: grid;
    place-items: center;
    padding: 24px;
    background: var(--background);
}

.login-screen.hidden {
    display: none;
}

.login-card {
    width: min(100%, 390px);
    padding: 36px;
    border: 1px solid var(--border);
    border-radius: var(--radius-large);
    background: var(--surface);
    box-shadow: var(--shadow-modal);
}

.login-card h1 { margin: 22px 0 6px; font-size: 27px; }
.login-card > p { margin: 0 0 24px; color: var(--text-secondary); }
.login-card label { display: grid; margin-top: 16px; gap: 7px; font-size: 13px; font-weight: 600; }
.login-card input { width: 100%; min-height: 44px; padding: 0 12px; border: 1px solid var(--border-strong); border-radius: var(--radius-small); }
.login-card button { width: 100%; min-height: 44px; margin-top: 22px; border: 0; border-radius: var(--radius-small); background: var(--accent); color: white; font-weight: 600; }
.login-card button:disabled { opacity: .65; }
.login-card .login-message { min-height: 18px; margin: 14px 0 -8px; color: var(--danger); font-size: 13px; }