:root {
    color-scheme: light dark;
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f5f7fb;
    color: #1f2933;
}

body {
    margin: 0;
    min-height: 100vh;
}

.page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 2rem;
}

.card {
    max-width: 360px;
    width: 100%;
    background: #ffffff;
    border-radius: 16px;
    padding: 2.5rem 2rem;
    box-shadow: 0 20px 45px rgba(15, 23, 42, 0.12);
    text-align: center;
}

.title {
    margin: 0;
    font-size: 1.9rem;
    font-weight: 600;
    letter-spacing: -0.02em;
}

.subtitle {
    margin: 0.75rem 0 2rem;
    font-size: 0.95rem;
    color: #52606d;
}

.gsi-container {
    display: inline-flex;
    justify-content: center;
}

.status {
    margin-top: 1.5rem;
    min-height: 1.25rem;
    font-size: 0.9rem;
    color: #2563eb;
}

.google-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    border: 1px solid #d1d5db;
    border-radius: 999px;
    padding: 0.75rem 1.6rem;
    font-size: 0.95rem;
    font-weight: 600;
    color: #1f2933;
    background-color: #ffffff;
    cursor: pointer;
    transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
}

.google-btn:hover {
    border-color: #9ca3af;
    box-shadow: 0 8px 18px rgba(37, 99, 235, 0.12);
    transform: translateY(-1px);
}

.google-btn:active {
    transform: translateY(0);
    box-shadow: 0 4px 12px rgba(15, 23, 42, 0.14);
}

.google-btn:disabled {
    cursor: not-allowed;
    opacity: 0.65;
    box-shadow: none;
}

.google-icon {
    width: 20px;
    height: 20px;
}

@media (max-width: 480px) {
    .card {
        padding: 2rem 1.5rem;
    }

    .title {
        font-size: 1.6rem;
    }
}