/* ============================================================
   buttons.css - BUTTONS
   ============================================================ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: 0.6rem 1.4rem;
    font-weight: var(--font-weight-semibold);
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    border-radius: var(--radius-sm);
    border: 1px solid transparent;
    transition: all var(--transition-fast);
    cursor: pointer;
    text-decoration: none;
    min-height: var(--control-min-height);
    min-width: var(--touch-target-min);
    user-select: none;
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
}

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

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

    .btn:active:not(:disabled) {
        transform: scale(0.96);
        transition: transform var(--transition-fast);
    }

/* ============================================================
   BUTTON SIZES
   ============================================================ */
.btn-sm {
    padding: 0.4rem 0.8rem;
    font-size: var(--font-size-sm);
    min-height: 36px;
}

.btn-lg {
    padding: 0.7rem 1.5rem;
    font-size: var(--font-size-lg);
    min-height: var(--touch-target-comfort);
}

/* ============================================================
   BUTTON VARIANTS
   ============================================================ */
.btn-primary {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: var(--color-text-inverse);
}

    .btn-primary:hover:not(:disabled) {
        background: var(--color-primary-dark);
        border-color: var(--color-primary-dark);
        color: var(--color-text-inverse);
        transform: translateY(-1px);
        box-shadow: 0 4px 12px rgba(58, 107, 140, 0.3);
    }

    .btn-primary:active:not(:disabled) {
        transform: translateY(0) scale(0.96);
    }

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

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

.btn-outline-secondary {
    color: var(--color-text-secondary);
    border-color: var(--color-border);
    background: transparent;
}

    .btn-outline-secondary:hover:not(:disabled) {
        background: var(--color-surface-hover);
        border-color: var(--color-text-muted);
        color: var(--color-text);
        transform: translateY(-1px);
    }

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

    .btn-success:hover:not(:disabled) {
        background: #4CAF50;
        border-color: #4CAF50;
        color: var(--color-text-inverse);
        transform: translateY(-1px);
        box-shadow: 0 4px 12px rgba(92, 184, 92, 0.3);
    }

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

    .btn-danger:hover:not(:disabled) {
        background: var(--color-danger-hover);
        border-color: var(--color-danger-hover);
        color: var(--color-text-inverse);
        transform: translateY(-1px);
        box-shadow: 0 4px 12px rgba(217, 83, 79, 0.3);
    }

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

    .btn-warning:hover:not(:disabled) {
        background: #E09D3E;
        border-color: #E09D3E;
        color: var(--color-text-inverse);
        transform: translateY(-1px);
    }

.btn-info {
    background: var(--color-info);
    border-color: var(--color-info);
    color: var(--color-text-inverse);
}

    .btn-info:hover:not(:disabled) {
        background: #4AB0CE;
        border-color: #4AB0CE;
        color: var(--color-text-inverse);
        transform: translateY(-1px);
    }

/* ============================================================
   BUTTON LOADING STATE
   ============================================================ */
.btn.loading {
    opacity: 0.7;
    pointer-events: none;
    position: relative;
}

    .btn.loading .btn-text {
        visibility: hidden;
    }

    .btn.loading::after {
        content: '';
        position: absolute;
        width: 20px;
        height: 20px;
        border: 2.5px solid rgba(255, 255, 255, 0.3);
        border-top-color: #fff;
        border-radius: var(--radius-full);
        animation: btn-spin 0.7s linear infinite;
    }

.btn-outline-secondary.loading::after {
    border-color: rgba(100, 116, 139, 0.3);
    border-top-color: var(--color-text-muted);
}

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

/* ============================================================
   ICON-ONLY BUTTONS
   ============================================================ */
.btn-icon {
    width: var(--touch-target-min);
    height: var(--touch-target-min);
    padding: 0;
    border-radius: var(--radius-full);
    flex-shrink: 0;
}

    .btn-icon.btn-sm {
        width: 36px;
        height: 36px;
    }

    .btn-icon.btn-lg {
        width: var(--touch-target-comfort);
        height: var(--touch-target-comfort);
    }

/* ============================================================
   BUTTON GROUPS
   ============================================================ */
.btn-group {
    display: flex;
    gap: var(--space-1);
}

    .btn-group .btn {
        flex: 1;
    }

/* ============================================================
   FULL WIDTH
   ============================================================ */
.btn-block {
    width: 100%;
}

.btn-block-mobile {
    width: 100%;
}

@media (min-width: 576px) {
    .btn-block-mobile {
        width: auto;
    }
}

/* ============================================================
   TOUCH DEVICES
   ============================================================ */
@media (pointer: coarse) {
    .btn {
        min-height: var(--touch-target-comfort);
        padding: 0.6rem 1.25rem;
    }

    .btn-sm {
        min-height: 40px;
        padding: 0.5rem 0.9rem;
    }

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

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

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

        .btn.loading::after {
            animation-duration: 1.5s;
        }

    @keyframes btn-spin {
        to {
            transform: rotate(0deg);
        }
    }
}