/* ====================================
   BUTTONS CSS - Python Learning Platform
   ==================================== */

/* Base button */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-lg);
    font-size: var(--text-base);
    font-weight: 500;
    line-height: 1.5;
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    cursor: pointer;
    border: none;
    outline: none;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Primary button */
.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: var(--white);
    box-shadow: 0 2px 4px rgba(79, 70, 229, 0.3);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.4);
}

.btn-primary:active:not(:disabled) {
    transform: translateY(0);
}

/* Secondary button */
.btn-secondary {
    background: var(--gray-100);
    color: var(--gray-700);
    border: 1px solid var(--gray-200);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--gray-200);
    border-color: var(--gray-300);
}

/* Outline button */
.btn-outline {
    background: transparent;
    color: var(--primary);
    border: 2px solid var(--primary);
}

.btn-outline:hover:not(:disabled) {
    background: var(--primary);
    color: var(--white);
}

/* Success button */
.btn-success {
    background: linear-gradient(135deg, var(--success) 0%, #059669 100%);
    color: var(--white);
    box-shadow: 0 2px 4px rgba(16, 185, 129, 0.3);
}

.btn-success:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.4);
}

/* Danger button */
.btn-danger {
    background: linear-gradient(135deg, var(--error) 0%, #DC2626 100%);
    color: var(--white);
    box-shadow: 0 2px 4px rgba(239, 68, 68, 0.3);
}

.btn-danger:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(239, 68, 68, 0.4);
}

/* Ghost button (minimal) */
.btn-ghost {
    background: transparent;
    color: var(--gray-600);
}

.btn-ghost:hover:not(:disabled) {
    background: var(--gray-100);
    color: var(--gray-800);
}

/* Button sizes */
.btn-sm {
    padding: var(--space-xs) var(--space-md);
    font-size: var(--text-sm);
}

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

.btn-xl {
    padding: var(--space-lg) var(--space-2xl);
    font-size: var(--text-xl);
}

/* Full width button */
.btn-block {
    width: 100%;
}

/* Icon button */
.btn-icon {
    padding: var(--space-sm);
    border-radius: var(--radius-full);
}

.btn-icon.btn-sm {
    padding: var(--space-xs);
}

.btn-icon.btn-lg {
    padding: var(--space-md);
}

/* Button with loader */
.btn-loading {
    position: relative;
    color: transparent !important;
}

.btn-loading::after {
    content: '';
    position: absolute;
    width: 16px;
    height: 16px;
    border: 2px solid var(--white);
    border-top-color: transparent;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

/* Button group */
.btn-group {
    display: inline-flex;
}

.btn-group .btn {
    border-radius: 0;
}

.btn-group .btn:first-child {
    border-radius: var(--radius-md) 0 0 var(--radius-md);
}

.btn-group .btn:last-child {
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.btn-group .btn:not(:last-child) {
    border-right: 1px solid rgba(255, 255, 255, 0.2);
}