/**
 * KINVA Studio - Frontend CSS
 * Version: 1.1.1
 * Uses KINVA UI color system
 */

/* ==========================================================================
   CSS Variables - KINVA Color System
   ========================================================================== */

.kinva-studio-tool {
    --kinva-primary: #2271b1;
    --kinva-primary-dark: #1e5a8a;
    --kinva-primary-light: #dbeafe;
    
    --kinva-success: #059669;
    --kinva-success-light: #d1fae5;
    --kinva-warning: #d97706;
    --kinva-warning-light: #fef3c7;
    --kinva-danger: #dc2626;
    
    --kinva-gray-50: #f9fafb;
    --kinva-gray-100: #f3f4f6;
    --kinva-gray-200: #e5e7eb;
    --kinva-gray-300: #d1d5db;
    --kinva-gray-400: #9ca3af;
    --kinva-gray-500: #6b7280;
    --kinva-gray-600: #4b5563;
    --kinva-gray-700: #374151;
    --kinva-gray-800: #1f2937;
    --kinva-gray-900: #111827;
    
    --kinva-radius: 6px;
    --kinva-radius-lg: 8px;
    --kinva-shadow: 0 1px 3px rgba(0,0,0,0.1);
    --kinva-shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1);
    --kinva-transition: 0.2s ease;
}

/* ==========================================================================
   BASE LAYOUT
   ========================================================================== */

.kinva-studio-tool {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background: var(--kinva-gray-100);
    border-radius: var(--kinva-radius-lg);
    overflow: hidden;
    box-shadow: var(--kinva-shadow-md);
    display: flex;
    flex-direction: column;
}

.kinva-studio-tool * {
    box-sizing: border-box;
}

/* Tool Header */
.kinva-tool-header {
    text-align: center;
    padding: 1.25rem 1.5rem;
    background: #fff;
    border-bottom: 1px solid var(--kinva-gray-200);
}

.kinva-tool-header h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--kinva-primary);
    margin: 0 0 0.25rem 0;
}

.kinva-tool-subtitle {
    color: var(--kinva-gray-500);
    margin: 0;
    font-size: 0.9rem;
}

/* Main Layout */
.kinva-studio-layout {
    display: flex;
    flex: 1;
    min-height: 550px;
}

/* ==========================================================================
   CANVAS AREA
   ========================================================================== */

.kinva-studio-canvas-area {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--kinva-gray-100);
    position: relative;
    padding: 24px;
}

.kinva-studio-canvas {
    max-width: 100%;
    max-height: 100%;
    box-shadow: var(--kinva-shadow-md);
    border-radius: var(--kinva-radius);
    background: #fff;
}

/* Dropzone */
.kinva-studio-dropzone {
    position: absolute;
    inset: 12px;
    border: 3px dashed var(--kinva-primary);
    border-radius: var(--kinva-radius-lg);
    background: rgba(34, 113, 177, 0.08);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 15;
}

.kinva-studio-dropzone.active {
    display: flex;
}

.kinva-studio-dropzone-content {
    text-align: center;
    color: var(--kinva-primary);
}

.kinva-studio-dropzone-icon {
    font-size: 2.5rem;
    display: block;
    margin-bottom: 0.5rem;
}

/* Empty State */
.kinva-studio-empty {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--kinva-gray-50);
}

.kinva-studio-empty.hidden {
    display: none;
}

.kinva-studio-empty-content {
    text-align: center;
    padding: 2rem;
}

.kinva-studio-empty-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

.kinva-studio-empty h3 {
    margin: 0 0 0.5rem 0;
    color: var(--kinva-gray-700);
}

.kinva-studio-empty p {
    color: var(--kinva-gray-500);
    margin: 0 0 1.5rem 0;
    font-size: 0.9rem;
}

/* Crop Overlay */
.kinva-studio-crop-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.4);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 20;
}

.kinva-studio-crop-frame {
    position: absolute;
    border: 3px dashed var(--kinva-primary);
    background: rgba(34, 113, 177, 0.1);
    cursor: move;
    border-radius: var(--kinva-radius);
}

.kinva-studio-crop-info {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: #fff;
    background: var(--kinva-primary);
    padding: 0.5rem 1rem;
    border-radius: var(--kinva-radius);
    font-size: 0.85rem;
    font-weight: 500;
    white-space: nowrap;
    pointer-events: none;
}

/* Crop Resize Handles */
.kinva-crop-handle {
    position: absolute;
    width: 14px;
    height: 14px;
    background: #fff;
    border: 2px solid var(--kinva-primary);
    border-radius: 2px;
    display: none;
    z-index: 25;
}

.kinva-crop-handle-nw { top: -7px; left: -7px; cursor: nwse-resize; }
.kinva-crop-handle-ne { top: -7px; right: -7px; cursor: nesw-resize; }
.kinva-crop-handle-sw { bottom: -7px; left: -7px; cursor: nesw-resize; }
.kinva-crop-handle-se { bottom: -7px; right: -7px; cursor: nwse-resize; }
.kinva-crop-handle-n { top: -7px; left: 50%; transform: translateX(-50%); cursor: ns-resize; }
.kinva-crop-handle-s { bottom: -7px; left: 50%; transform: translateX(-50%); cursor: ns-resize; }
.kinva-crop-handle-e { right: -7px; top: 50%; transform: translateY(-50%); cursor: ew-resize; }
.kinva-crop-handle-w { left: -7px; top: 50%; transform: translateY(-50%); cursor: ew-resize; }

/* Crop Mode Specific */
[data-tool="grid"][data-mode="crop"] .kinva-studio-crop-overlay {
    display: flex;
}

[data-tool="grid"][data-mode="crop"] .kinva-studio-crop-frame {
    background: transparent;
}

[data-tool="grid"][data-mode="crop"] .kinva-crop-handle {
    display: block;
}

[data-tool="grid"][data-mode="crop"] .kinva-studio-crop-info {
    display: none;
}

/* Crop Presets */
.kinva-studio-crop-presets {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 0.75rem;
}

.kinva-studio-crop-presets .kinva-preset-btn {
    flex: 1;
    min-width: 50px;
    padding: 0.4rem 0.5rem;
    font-size: 0.75rem;
}

.kinva-studio-crop-info-display {
    margin-top: 0.75rem;
    padding: 0.5rem;
    background: var(--kinva-gray-50);
    border-radius: var(--kinva-radius);
    text-align: center;
    font-size: 0.85rem;
    color: var(--kinva-gray-600);
}

.kinva-studio-apply-crop {
    margin-top: 0.75rem;
    width: 100%;
}

/* ==========================================================================
   SIDEBAR
   ========================================================================== */

.kinva-studio-sidebar {
    width: 280px;
    min-width: 280px;
    background: #fff;
    border-left: 1px solid var(--kinva-gray-200);
    display: flex;
    flex-direction: column;
    overflow-y: auto;
}

.kinva-studio-file-input {
    display: none;
}

/* Sections */
.kinva-studio-section {
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--kinva-gray-100);
}

.kinva-studio-section h4 {
    margin: 0 0 0.75rem 0;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--kinva-gray-500);
}

/* ==========================================================================
   FORM ELEMENTS
   ========================================================================== */

.kinva-studio-field {
    margin-bottom: 0.75rem;
}

.kinva-studio-field:last-child {
    margin-bottom: 0;
}

.kinva-studio-field label {
    display: block;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--kinva-gray-700);
    margin-bottom: 0.35rem;
}

/* Inputs */
.kinva-studio-input,
.kinva-studio-select {
    width: 100%;
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--kinva-gray-300);
    border-radius: var(--kinva-radius);
    font-size: 0.9rem;
    color: var(--kinva-gray-800);
    background: #fff;
    transition: border-color var(--kinva-transition);
}

.kinva-studio-input:focus,
.kinva-studio-select:focus {
    outline: none;
    border-color: var(--kinva-primary);
    box-shadow: 0 0 0 2px var(--kinva-primary-light);
}

/* Input with Unit */
.kinva-studio-input-unit {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.kinva-studio-input-unit input {
    flex: 1;
    min-width: 0;
}

.kinva-studio-input-unit span {
    color: var(--kinva-gray-500);
    font-size: 0.85rem;
    font-weight: 500;
}

/* Color Input */
.kinva-studio-color {
    width: 100%;
    height: 36px;
    padding: 2px;
    border: 1px solid var(--kinva-gray-300);
    border-radius: var(--kinva-radius);
    cursor: pointer;
}

/* Range Slider */
.kinva-studio-range-wrap {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.kinva-studio-range {
    flex: 1;
    height: 6px;
    border-radius: 3px;
    background: var(--kinva-gray-200);
    -webkit-appearance: none;
    appearance: none;
}

.kinva-studio-range::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--kinva-primary);
    cursor: pointer;
    box-shadow: var(--kinva-shadow);
}

.kinva-studio-range::-moz-range-thumb {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--kinva-primary);
    cursor: pointer;
    border: none;
}

.kinva-studio-range-value {
    min-width: 42px;
    text-align: right;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--kinva-gray-600);
}

/* Toggle */
.kinva-studio-toggle-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 0;
}

.kinva-studio-toggle-row label {
    font-size: 0.85rem;
    color: var(--kinva-gray-700);
    margin: 0;
}

.kinva-studio-toggle {
    width: 40px;
    height: 22px;
    background: var(--kinva-gray-300);
    border-radius: 11px;
    cursor: pointer;
    position: relative;
    transition: background var(--kinva-transition);
}

.kinva-studio-toggle::after {
    content: '';
    position: absolute;
    top: 2px;
    left: 2px;
    width: 18px;
    height: 18px;
    background: #fff;
    border-radius: 50%;
    transition: transform var(--kinva-transition);
    box-shadow: 0 1px 2px rgba(0,0,0,0.2);
}

.kinva-studio-toggle.active {
    background: var(--kinva-primary);
}

.kinva-studio-toggle.active::after {
    transform: translateX(18px);
}

/* ==========================================================================
   MODE TOGGLE
   ========================================================================== */

.kinva-studio-mode-toggle {
    display: flex;
    gap: 0;
    background: var(--kinva-gray-100);
    border-radius: var(--kinva-radius);
    padding: 3px;
}

/* 3-button mode toggle */
.kinva-studio-mode-toggle-3 .kinva-mode-btn {
    padding: 0.4rem 0.5rem;
    font-size: 0.8rem;
}

.kinva-mode-btn {
    flex: 1;
    padding: 0.5rem 0.75rem;
    background: transparent;
    border: none;
    border-radius: calc(var(--kinva-radius) - 2px);
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--kinva-gray-500);
    cursor: pointer;
    transition: var(--kinva-transition);
    white-space: nowrap;
}

.kinva-mode-btn:hover {
    color: var(--kinva-gray-700);
}

.kinva-mode-btn.active {
    background: var(--kinva-primary);
    color: #fff;
    box-shadow: var(--kinva-shadow);
}

/* ==========================================================================
   CANVAS MODE SECTION
   ========================================================================== */

.kinva-studio-canvas-size-grid,
.kinva-studio-grid-size,
.kinva-studio-density-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
}

/* Presets */
.kinva-studio-canvas-presets {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin-top: 0.75rem;
}

.kinva-preset-btn {
    padding: 0.3rem 0.6rem;
    background: var(--kinva-gray-100);
    border: 1px solid var(--kinva-gray-200);
    border-radius: calc(var(--kinva-radius) - 1px);
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--kinva-gray-600);
    cursor: pointer;
    transition: var(--kinva-transition);
}

.kinva-preset-btn:hover {
    background: var(--kinva-gray-200);
    border-color: var(--kinva-gray-300);
}

.kinva-preset-btn.active {
    background: var(--kinva-primary);
    border-color: var(--kinva-primary);
    color: #fff;
}

/* Grid Info */
.kinva-studio-grid-info {
    margin-top: 0.75rem;
    padding: 0.6rem;
    background: var(--kinva-primary-light);
    border-radius: var(--kinva-radius);
    text-align: center;
}

.kinva-studio-grid-info-text {
    font-size: 0.85rem;
    color: var(--kinva-primary-dark);
    font-weight: 600;
}

/* Aspect Warning */
.kinva-studio-aspect-warning {
    margin-top: 0.75rem;
    padding: 0.6rem;
    background: var(--kinva-warning-light);
    border: 1px solid #fcd34d;
    border-radius: var(--kinva-radius);
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
}

.kinva-warning-icon {
    flex-shrink: 0;
    font-size: 1rem;
}

.kinva-warning-text {
    font-size: 0.8rem;
    color: #92400e;
    line-height: 1.3;
}

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

.kinva-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    padding: 0.6rem 1rem;
    border: none;
    border-radius: var(--kinva-radius);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--kinva-transition);
    text-decoration: none;
    white-space: nowrap;
}

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

.kinva-btn-primary {
    background: var(--kinva-primary);
    color: #fff;
}

.kinva-btn-primary:hover:not(:disabled) {
    background: var(--kinva-primary-dark);
}

.kinva-btn-secondary {
    background: var(--kinva-gray-100);
    color: var(--kinva-gray-700);
    border: 1px solid var(--kinva-gray-300);
}

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

.kinva-btn-accent {
    background: var(--kinva-primary);
    color: #fff;
}

.kinva-btn-accent:hover:not(:disabled) {
    background: var(--kinva-primary-dark);
}

/* ==========================================================================
   ACTIONS SECTION
   ========================================================================== */

.kinva-studio-actions {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--kinva-gray-100);
}

/* Download Group - Equal width buttons */
.kinva-studio-download-group {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
}

.kinva-studio-download-group .kinva-btn {
    padding: 0.6rem 0.5rem;
}

/* ==========================================================================
   FOOTER - Centered at bottom
   ========================================================================== */

.kinva-tool-footer {
    text-align: center;
    padding: 0.75rem 1.25rem;
    color: var(--kinva-gray-400);
    font-size: 0.75rem;
    background: var(--kinva-gray-50);
    border-top: 1px solid var(--kinva-gray-200);
    margin-top: auto;
}

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

@media (max-width: 900px) {
    .kinva-studio-layout {
        flex-direction: column;
    }
    
    .kinva-studio-canvas-area {
        min-height: 350px;
    }
    
    .kinva-studio-sidebar {
        width: 100%;
        min-width: 100%;
        max-height: none;
        border-left: none;
        border-top: 1px solid var(--kinva-gray-200);
    }
}

@media (max-width: 480px) {
    .kinva-tool-header {
        padding: 1rem;
    }
    
    .kinva-tool-header h1 {
        font-size: 1.25rem;
    }
    
    .kinva-studio-section {
        padding: 0.875rem 1rem;
    }
    
    .kinva-studio-download-group {
        grid-template-columns: 1fr;
    }
}