.auth-button {
    position: relative;
    overflow: hidden;
    background: var(--accent);
    color: #fff;
    border: none;
    border-radius: 40px;
    padding: 0.85rem;
    font-weight: 600;
    font-size: 1.1rem;
    cursor: pointer;
    transition: background 0.25s, transform 0.15s, box-shadow 0.25s;
    margin-top: 0.3rem;
    box-shadow: 0 6px 20px rgba(74, 111, 165, 0.35);
}

.auth-button::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(120deg, transparent, rgba(255, 255, 255, 0.25), transparent);
    transform: translateX(-100%);
    transition: transform 0.6s ease;
    pointer-events: none;
}

.auth-button:hover::before { transform: translateX(100%); }

.auth-button:hover {
    background: var(--accent-hover);
    box-shadow: 0 8px 28px rgba(74, 111, 165, 0.5);
    transform: translateY(-2px);
}

.auth-button:active { transform: scale(0.96) translateY(0); }

.auth-button:disabled {
    opacity: 0.6;
    transform: scale(0.98);
    pointer-events: none;
    animation: authButtonPulse 1.5s ease-in-out infinite;
}

.auth-button.hidden { display: none; }

.auth-button .ripple {
    position: absolute;
    left: var(--ripple-x, 50%);
    top: var(--ripple-y, 50%);
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.4);
    pointer-events: none;
    animation: authRipple 0.6s ease-out forwards;
}