#headline {
    font-size: 4rem;
    font-weight: 700;
    margin-bottom: 24px;
    line-height: 1.1;
}

#subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: 40px;
    line-height: 1.5;
}

#login-btn {
    display: flex;
    align-items: center;
    gap: 12px;

    background-color: var(--bg-surface);
    color: var(--text-primary);
    border-radius: 12px;
    padding: 12px 24px;
    font-size: 1.5rem;
    cursor: pointer;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    text-decoration: none;
    transition: transform 0.2s ease;
}

#login-btn:hover {
    transform: scale(1.05);
}

#login-g-logo-img {
    height: 40px;
}

#helper-text {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-top: 8px;
}

/* Auth Error Box */
#auth-error-box {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    background-color: rgba(239, 68, 68, 0.15);
    border: 1px solid var(--error);
    border-radius: 12px;
    padding: 16px 20px;
    margin-bottom: 24px;
    max-width: 480px;
    text-align: left;
}

#auth-error-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
}

#auth-error-content {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

#auth-error-message {
    color: var(--error);
    font-weight: 600;
    font-size: 1rem;
    margin: 0;
    line-height: 1.4;
}

#auth-error-hint {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin: 0;
    line-height: 1.4;
}

#explain-section {
    margin-top: 64px;
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.5;
    text-align: left;
}

#explain-section h2 {
    color: var(--text-primary);
    font-size: 1.5rem;
    text-align: center;
}

#explain-section ul {
    margin-top: 16px;
    list-style-type: disc;
    padding-left: 20px;
}

#explain-section ul li {
    margin-bottom: 2px;
    font-size: 1.2rem;
}

/* Mobile */
@media (max-width: 600px) {
    #headline {
        font-size: 2.5rem;
    }
}