/**
 * Button Styles
 * Local First Tools v2
 */

/* ========================================
   BASE BUTTON
   ======================================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--btn-padding-y) var(--btn-padding-x);
    font-family: inherit;
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    line-height: 1;
    border: none;
    border-radius: var(--btn-radius);
    cursor: pointer;
    transition: all var(--duration-150) var(--ease-out);
    text-decoration: none;
    white-space: nowrap;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

.btn:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

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

/* Primary Button */
.btn-primary {
    background: var(--color-accent);
    color: var(--bg-primary);
}

.btn-primary:hover {
    background: #00e89a;
    box-shadow: var(--shadow-glow-accent);
}

.btn-primary:active {
    background: #00d08a;
    transform: translateY(1px);
}

/* Secondary Button */
.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    border: 1px solid var(--border-primary);
}

.btn-secondary:hover {
    border-color: var(--color-accent);
    color: var(--text-primary);
}

.btn-secondary:active {
    background: var(--bg-secondary);
}

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

.btn-ghost:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

/* Danger Button */
.btn-danger {
    background: var(--color-error);
    color: white;
}

.btn-danger:hover {
    background: #dc2626;
    box-shadow: 0 0 20px rgba(239, 68, 68, 0.3);
}

/* ========================================
   BUTTON SIZES
   ======================================== */

.btn-sm {
    padding: var(--space-1) var(--space-3);
    font-size: var(--text-xs);
}

.btn-lg {
    padding: var(--space-4) var(--space-6);
    font-size: var(--text-base);
}

/* ========================================
   BUTTON GROUPS
   ======================================== */

.btn-group {
    display: inline-flex;
    border-radius: var(--btn-radius);
    overflow: hidden;
}

.btn-group .btn {
    border-radius: 0;
    border-right: 1px solid var(--border-primary);
}

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

.btn-group .btn:last-child {
    border-radius: 0 var(--btn-radius) var(--btn-radius) 0;
    border-right: none;
}

/* ========================================
   ICON BUTTON
   ======================================== */

.icon-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    padding: 0;
    background: transparent;
    border: none;
    border-radius: var(--radius-lg);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--duration-150) var(--ease-out);
}

.icon-btn:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.icon-btn:active {
    transform: scale(0.95);
}

.icon-btn:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 0;
}

.icon-btn.active {
    color: var(--color-accent);
}

/* Icon Button Sizes */
.icon-btn-sm {
    width: 32px;
    height: 32px;
}

.icon-btn-lg {
    width: 48px;
    height: 48px;
}

/* ========================================
   FLOATING ACTION BUTTON
   ======================================== */

.fab {
    position: fixed;
    right: var(--space-5);
    bottom: calc(var(--bottom-nav-height) + var(--space-5));
    width: 56px;
    height: 56px;
    border-radius: var(--radius-full);
    background: var(--color-accent);
    color: var(--bg-primary);
    box-shadow: var(--shadow-lg), var(--shadow-glow-accent);
    z-index: var(--z-fixed);
}

.fab:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-xl), var(--shadow-glow-accent-strong);
}

.fab:active {
    transform: scale(0.95);
}

@media (max-width: 768px) {
    .fab {
        right: var(--space-4);
        bottom: calc(var(--bottom-nav-height) + var(--space-4) + env(safe-area-inset-bottom));
    }
}