/* ===== BOTÕES BASE ===== */
.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    border-radius: var(--border-radius-full);
    font-size: var(--font-size-md);
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.2s ease-in-out;
    line-height: 1.5;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.btn:active {
    transform: translateY(0);
}

/* ===== VARIANTES DE BOTÕES ===== */
.btn-primary {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary));
    color: var(--white);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    box-shadow: 0 4px 15px rgba(10, 36, 114, 0.3);
}

.btn-secondary {
    background: transparent;
    color: var(--primary-dark);
    border: 2px solid var(--primary-dark);
}

.btn-secondary:hover {
    background: var(--primary-dark);
    color: var(--white);
}

.btn-accent {
    background: var(--accent);
    color: var(--white);
}

.btn-accent:hover {
    background: var(--accent-light);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--accent);  /* Usa a cor principal com opacidade */
}

.btn-danger {
    background: var(--error);
    color: var(--white);
}

.btn-danger:hover {
    background: #dc2626;
    box-shadow: 0 4px 15px rgba(239, 68, 68, 0.3);
}

.btn-outline {
    background: transparent;
    color: var(--primary-dark);
    border: 2px solid var(--primary);
}

.btn-outline:hover {
    background: var(--primary);
    color: var(--white);
}

.btn-white {
    background: var(--white);
    color: var(--primary-dark);
}

.btn-white:hover {
    background: var(--light-gray);
}

/* ===== TAMANHOS DE BOTÕES ===== */
.btn-sm {
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: var(--font-size-sm);
}

.btn-lg {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: var(--font-size-lg);
}

.btn-block {
    display: block;
    width: 100%;
    text-align: center;
}

/* ===== ESTADO DESATIVADO ===== */
.btn:disabled,
.btn.disabled {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

/* ===== BOTÕES OAUTH ===== */
.oauth-buttons {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 20px;
}

.btn-oauth {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 12px;
    border: 1px solid var(--light-gray);
    /* border-radius: 5px; */
    border-radius: 30px;
    text-decoration: none;
    font-weight: 500;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn-oauth:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.btn-oauth img {
    width: 20px;
    height: 20px;
}

/* Cores específicas para cada provedor */
.btn-oauth.google {
    background: white;
    color: #333;
}

.btn-oauth.microsoft {
    background: #2F2F2F;
    color: white;
}

.btn-oauth.github {
    background: #24292e;
    color: white;
}

/* Divisor "ou" */
.oauth-divider {
    text-align: center;
    margin: 15px 0;
    color: var(--gray);
    position: relative;
}

.oauth-divider::before,
.oauth-divider::after {
    content: "";
    position: absolute;
    top: 50%;
    width: 45%;
    height: 1px;
    background: var(--light-gray);
}

.oauth-divider::before {
    left: 0;
}

.oauth-divider::after {
    right: 0;
}

/* Link de registo */
.register-link {
    text-align: center;
    margin-top: var(--spacing-lg);
}

.register-link a {
    color: var(--primary);
    text-decoration: none;
}

.register-link a:hover {
    text-decoration: underline;
}