/**
 * Button Components - Reusable button styles
 * Provides consistent button styling across the application
 */

/* ===== BASE BUTTON STYLES ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    font-family: var(--font-family-sans);
    font-weight: var(--font-weight-medium);
    line-height: 1;
    text-decoration: none;
    border: 1px solid transparent;
    border-radius: var(--radius);
    cursor: pointer;
    transition: all var(--transition);
    white-space: nowrap;
    user-select: none;
    position: relative;
    overflow: hidden;

    /* Default size */
    height: var(--button-height);
    padding: 0 var(--button-padding-x);
    font-size: var(--font-size-sm);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    pointer-events: none;
}

.btn:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.3);
}

.btn:active {
    transform: translateY(1px);
}

/* ===== BUTTON SIZES ===== */
.btn-sm {
    height: var(--button-height-sm);
    padding: 0 var(--button-padding-x-sm);
    font-size: var(--font-size-xs);
}

.btn-lg {
    height: var(--button-height-lg);
    padding: 0 var(--button-padding-x-lg);
    font-size: var(--font-size-base);
}

/* ===== BUTTON VARIANTS ===== */

/* Primary Button */
.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: var(--text-inverse);
    border-color: var(--primary-color);
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--color-primary-700), var(--color-primary-600));
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-primary:active:not(:disabled) {
    background: var(--color-primary-800);
    transform: translateY(0);
    box-shadow: var(--shadow-sm);
}

/* Secondary Button */
.btn-secondary {
    background-color: var(--surface-color);
    color: var(--text-primary);
    border-color: var(--border-color);
    box-shadow: var(--shadow-sm);
}

.btn-secondary:hover:not(:disabled) {
    background-color: var(--border-light);
    border-color: var(--border-medium);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-secondary:active:not(:disabled) {
    background-color: var(--border-color);
    transform: translateY(0);
}

/* Outline Button */
.btn-outline {
    background-color: transparent;
    color: var(--primary-color);
    border-color: var(--primary-color);
}

.btn-outline:hover:not(:disabled) {
    background-color: var(--primary-color);
    color: var(--text-inverse);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-outline:active:not(:disabled) {
    background-color: var(--color-primary-700);
    transform: translateY(0);
}

/* Ghost Button */
.btn-ghost {
    background-color: transparent;
    color: var(--text-secondary);
    border-color: transparent;
}

.btn-ghost:hover:not(:disabled) {
    background-color: var(--border-light);
    color: var(--text-primary);
    transform: translateY(-1px);
}

.btn-ghost:active:not(:disabled) {
    background-color: var(--border-color);
    transform: translateY(0);
}

/* ===== SEMANTIC BUTTON VARIANTS ===== */

/* Success Button */
.btn-success {
    background: linear-gradient(135deg, var(--success-color), var(--color-success-600));
    color: var(--text-inverse);
    border-color: var(--success-color);
    box-shadow: var(--shadow-sm);
}

.btn-success:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--color-success-600), var(--color-success-700));
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

/* Error/Danger Button */
.btn-danger {
    background: linear-gradient(135deg, var(--error-color), var(--color-error-600));
    color: var(--text-inverse);
    border-color: var(--error-color);
    box-shadow: var(--shadow-sm);
}

.btn-danger:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--color-error-600), var(--color-error-700));
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

/* Warning Button */
.btn-warning {
    background: linear-gradient(135deg, var(--warning-color), var(--color-warning-600));
    color: var(--text-inverse);
    border-color: var(--warning-color);
    box-shadow: var(--shadow-sm);
}

.btn-warning:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--color-warning-600), var(--color-warning-700));
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

/* Info Button */
.btn-info {
    background: linear-gradient(135deg, var(--info-color), var(--color-info-600));
    color: var(--text-inverse);
    border-color: var(--info-color);
    box-shadow: var(--shadow-sm);
}

.btn-info:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--color-info-600), var(--color-info-700));
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

/* ===== BUTTON GROUPS ===== */
.btn-group {
    display: inline-flex;
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
}

.btn-group .btn {
    border-radius: 0;
    border-right: none;
}

.btn-group .btn:first-child {
    border-top-left-radius: var(--radius);
    border-bottom-left-radius: var(--radius);
}

.btn-group .btn:last-child {
    border-top-right-radius: var(--radius);
    border-bottom-right-radius: var(--radius);
    border-right: 1px solid;
}

.btn-group .btn:only-child {
    border-radius: var(--radius);
    border-right: 1px solid;
}

/* ===== ICON BUTTONS ===== */
.btn-icon {
    width: var(--button-height);
    height: var(--button-height);
    padding: 0;
    border-radius: var(--radius-full);
}

.btn-icon.btn-sm {
    width: var(--button-height-sm);
    height: var(--button-height-sm);
}

.btn-icon.btn-lg {
    width: var(--button-height-lg);
    height: var(--button-height-lg);
}

/* ===== LOADING STATE ===== */
.btn.loading {
    color: transparent;
    pointer-events: none;
}

.btn.loading::after {
    content: "";
    position: absolute;
    width: 1rem;
    height: 1rem;
    border: 2px solid currentColor;
    border-top-color: transparent;
    border-radius: var(--radius-full);
    animation: btn-spin 1s linear infinite;
}

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

/* ===== FLOATING ACTION BUTTON ===== */
.btn-fab {
    position: fixed;
    bottom: var(--space-6);
    right: var(--space-6);
    width: 3.5rem;
    height: 3.5rem;
    border-radius: var(--radius-full);
    box-shadow: var(--shadow-lg);
    z-index: var(--z-sticky);
}

.btn-fab:hover:not(:disabled) {
    box-shadow: var(--shadow-xl);
    transform: translateY(-2px) scale(1.05);
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 640px) {
    .btn {
        font-size: var(--font-size-xs);
        height: var(--button-height-sm);
        padding: 0 var(--button-padding-x-sm);
    }

    .btn-lg {
        height: var(--button-height);
        padding: 0 var(--button-padding-x);
        font-size: var(--font-size-sm);
    }

    .btn-fab {
        bottom: var(--space-4);
        right: var(--space-4);
        width: 3rem;
        height: 3rem;
    }
}

/* ===== DARK MODE ADJUSTMENTS ===== */
body.dark-mode .btn-secondary {
    background-color: var(--surface-elevated);
    border-color: var(--border-color);
}

body.dark-mode .btn-secondary:hover:not(:disabled) {
    background-color: var(--border-light);
}

body.dark-mode .btn-ghost:hover:not(:disabled) {
    background-color: var(--surface-elevated);
}

/* ===== ACCESSIBILITY ===== */
@media (prefers-reduced-motion: reduce) {
    .btn {
        transition: none;
    }

    .btn:hover:not(:disabled),
    .btn:active:not(:disabled) {
        transform: none;
    }

    .btn.loading::after {
        animation: none;
    }
}