/* Buttons */
.btn {
    border-radius: 8px;
    padding: var(--sp-2) var(--sp-4);
    font-weight: 600;
    transition: all var(--transition-fast);
    position: relative;
    overflow: hidden;
}

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

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

.btn-primary:hover {
    background-color: var(--primary-hover);
    border-color: var(--primary-hover);
    box-shadow: 0 4px 6px -1px rgba(0, 91, 172, 0.3);
}

.btn-secondary {
    background-color: var(--card-bg);
    color: var(--primary-color);
    border-color: var(--border-color);
}

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

.btn-success {
    background-color: var(--success-color);
    border-color: var(--success-color);
}

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

/* Button Loading State */
.btn.loading {
    color: transparent !important;
    pointer-events: none;
}

.btn.loading::after {
    content: '';
    position: absolute;
    width: 1.2rem;
    height: 1.2rem;
    top: calc(50% - 0.6rem);
    left: calc(50% - 0.6rem);
    border: 2px solid rgba(255,255,255,0.5);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 1s linear infinite;
}

.btn-secondary.loading::after {
    border: 2px solid rgba(0,0,0,0.1);
    border-top-color: var(--primary-color);
}

@keyframes spin {
    to { transform: rotate(360deg); }
}