/* ============================================
   WREN DESIGN SYSTEM - BUTTONS
   Mobile-first, consistent button components
   ============================================ */

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

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);

    /* Sizing - Uses design tokens */
    padding: 0 var(--space-5);
    height: var(--input-height);
    min-height: var(--touch-target-min);

    /* Typography - Space Grotesk for all buttons */
    font-family: var(--font-display);
    font-size: var(--text-base);
    font-weight: 600;
    text-decoration: none;
    line-height: 1;

    /* Border */
    border: var(--border-width) solid var(--black);
    border-radius: var(--radius-lg);

    /* Interaction */
    cursor: pointer;
    transition: all var(--transition);
    background: none;

    /* Prevent text wrapping */
    white-space: nowrap;

    /* Touch optimization */
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
    user-select: none;
}

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

/* PRIMARY - Terracotta filled */
.btn-primary {
    background: var(--wren-terracotta);
    border-color: var(--wren-terracotta);
    color: var(--white);
}

.btn-primary:hover {
    background: var(--wren-terracotta-hover);
    border-color: var(--wren-terracotta-hover);
    color: var(--white);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.btn-primary:active:not(:disabled):not(.btn-disabled) {
    background: var(--wren-terracotta-dark);
    border-color: var(--wren-terracotta-dark);
    transform: translateY(0);
    box-shadow: none;
}

/* OUTLINE - Gray border, white bg */
.btn-outline {
    background: var(--white);
    border-color: var(--gray-300);
    color: var(--gray-900);
}

.btn-outline:hover {
    background: var(--gray-50);
    border-color: var(--gray-900);
    color: var(--gray-900);
    transform: translateY(-1px);
}

.btn-outline:active:not(:disabled):not(.btn-disabled) {
    background: var(--gray-100);
    transform: translateY(0);
}

/* GHOST - No border, subtle hover */
.btn-ghost {
    background: transparent;
    border-color: transparent;
    color: var(--gray-700);
}

.btn-ghost:hover {
    background: var(--gray-100);
    color: var(--gray-900);
}

.btn-ghost:active:not(:disabled):not(.btn-disabled) {
    background: var(--gray-200);
}

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

/* SUCCESS */
.btn-success {
    background: var(--success);
    border-color: var(--success);
    color: var(--white);
}

.btn-success:hover {
    background: var(--success-hover);
    border-color: var(--success-hover);
    color: var(--white);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.btn-success:active:not(:disabled):not(.btn-disabled) {
    transform: translateY(0);
    box-shadow: none;
}

/* WARNING */
.btn-warning {
    background: var(--warning);
    border-color: var(--warning);
    color: var(--white);
}

.btn-warning:hover {
    background: var(--warning-hover);
    border-color: var(--warning-hover);
    color: var(--white);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.btn-warning:active:not(:disabled):not(.btn-disabled) {
    transform: translateY(0);
    box-shadow: none;
}

/* INFO */
.btn-info {
    background: var(--info);
    border-color: var(--info);
    color: var(--white);
}

.btn-info:hover {
    background: var(--info-hover);
    border-color: var(--info-hover);
    color: var(--white);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.btn-info:active:not(:disabled):not(.btn-disabled) {
    transform: translateY(0);
    box-shadow: none;
}

/* DANGER / ERROR */
.btn-danger {
    background: var(--error);
    border-color: var(--error);
    color: var(--white);
}

.btn-danger:hover {
    background: var(--error-hover);
    border-color: var(--error-hover);
    color: var(--white);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.btn-danger:active:not(:disabled):not(.btn-disabled) {
    transform: translateY(0);
    box-shadow: none;
}

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

.btn-sm {
    height: var(--input-height-sm);
    min-height: var(--touch-target-sm);
    padding: 0 var(--space-4);
    font-size: var(--text-sm);
}

.btn-lg {
    height: var(--input-height-lg);
    min-height: var(--touch-target-lg);
    padding: 0 var(--space-8);
    font-size: var(--text-lg);
    font-weight: 700;
}

/* ========================================
   ICON BUTTONS
   ======================================== */

.btn i {
    font-size: 16px;
    flex-shrink: 0;
}

.btn-sm i {
    font-size: 14px;
}

.btn-lg i {
    font-size: 20px;
}

/* Icon-only button (square) */
.btn-icon {
    width: var(--input-height);
    height: var(--input-height);
    min-width: var(--touch-target-min);
    min-height: var(--touch-target-min);
    padding: 0;
}

.btn-icon.btn-sm {
    width: var(--input-height-sm);
    height: var(--input-height-sm);
    min-width: var(--touch-target-sm);
    min-height: var(--touch-target-sm);
}

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

/* ========================================
   BUTTON STATES
   ======================================== */

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

/* Loading */
.btn-loading {
    position: relative;
    pointer-events: none;
}

.btn-loading .btn-text {
    opacity: 0;
}

.btn-spinner {
    position: absolute;
    display: none;
    align-items: center;
    justify-content: center;
}

.btn-loading .btn-spinner {
    display: inline-flex;
}

.spinner {
    animation: btn-spin 1s linear infinite;
}

@keyframes btn-spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* Focus */
.btn:focus-visible {
    outline: none;
    box-shadow: var(--shadow-focus);
}

.btn-danger:focus-visible {
    box-shadow: var(--shadow-focus-error);
}

.btn-success:focus-visible {
    box-shadow: var(--shadow-focus-success);
}

/* ========================================
   FULL WIDTH
   ======================================== */

.btn-block {
    width: 100%;
}

/* ========================================
   BUTTON GROUP
   ======================================== */

.btn-group {
    display: inline-flex;
    gap: 0;
}

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

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

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

.btn-group .btn:not(:first-child) {
    margin-left: calc(-1 * var(--border-width));
}

/* ========================================
   MOBILE RESPONSIVE
   ======================================== */

@media (max-width: 480px) {
    /* Larger touch targets on mobile */
    .btn {
        min-height: 48px;
        font-size: var(--text-base);
    }

    .btn-sm {
        min-height: 40px;
    }

    /* Full width buttons in containers on mobile */
    .btn-mobile-block {
        width: 100%;
    }
}

/* Touch device optimizations */
@media (hover: none) and (pointer: coarse) {
    .btn:hover {
        transform: none;
    }

    .btn:active:not(:disabled):not(.btn-disabled) {
        opacity: 0.8;
    }
}