:root {
    --bg: #111827;
    --card: #1f2937;
    --border: #374151;
    --text: #f9fafb;
    --text-muted: #9ca3af;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --success: #10b981;
    --error: #ef4444;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    min-height: 100vh;
    background: var(--bg);
    color: var(--text);
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    display: flex;
    flex-direction: column;
}

body:not(.dashboard-layout) {
    justify-content: center;
    align-items: center;
    padding: 1rem;
}

.card {
    width: 100%;
    max-width: 400px;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 2.5rem 2rem;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -4px rgba(0, 0, 0, 0.3);
    text-align: center;
}

.card h1 {
    margin: 0 0 0.5rem 0;
    font-size: 1.75rem;
    font-weight: 700;
    letter-spacing: -0.025em;
}

.card .subtitle {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: 2rem;
}

.btn {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    padding: 0.85rem;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 10px;
    border: none;
    cursor: pointer;
    text-decoration: none;
    transition: background-color 0.15s ease, border-color 0.15s ease, transform 0.1s ease;
}

.btn:active {
    transform: scale(0.98);
}

.btn-secondary {
    background: #1f2937;
    color: white;
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    background: var(--accent);
    border-color: var(--accent);
}

.footer-text {
    margin-top: 1.5rem;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.message {
    margin-top: 1.25rem;
    padding: 0.85rem 1rem;
    border-radius: 10px;
    font-size: 0.9rem;
    line-height: 1.4;
    text-align: left;
}

.message.error {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.2);
    color: var(--error);
    display: block;
}