/* =============================================
   GLOBAL STYLES & VARIABLES
   ============================================= */
:root {
    --primary: #4f46e5;
    --primary-dark: #4338ca;
    --secondary: #ec4899;
    --dark: #1f2937;
    --darker: #111827;
    --light: #f9fafb;
    --gray: #9ca3af;
    --border-color: rgba(255, 255, 255, 0.1);
    --border-radius: 12px;
    --box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --control-panel-width: 380px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html,
body {
    height: 100%;
    overflow: hidden;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--darker);
    color: var(--light);
    line-height: 1.6;
    display: flex;
    flex-direction: column;
}

/* =============================================
   LAYOUT & CONTAINERS
   ============================================= */
header {
    background-color: var(--dark);
    padding: 1rem 1.5rem;
    box-shadow: var(--box-shadow);
    flex-shrink: 0;
    z-index: 10;
    border-bottom: 1px solid var(--border-color);
}

header h1 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--light);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.app-container {
    display: flex;
    flex: 1;
    overflow: hidden;
}

.controls-panel {
    width: var(--control-panel-width);
    background-color: var(--dark);
    padding: 1.5rem;
    overflow-y: auto;
    flex-shrink: 0;
    z-index: 5;
}

.canvas-container {
    position: relative;
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    background-color: var(--darker);
}

#card-canvas {
    background-color: #000;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    cursor: grab;
    max-width: 100%;
    max-height: 100%;
    aspect-ratio: 1 / 1;
}

#card-canvas:active {
    cursor: grabbing;
}

/* =============================================
   UI COMPONENTS
   ============================================= */
.panel {
    background-color: rgba(0, 0, 0, 0.2);
    border-radius: var(--border-radius);
    padding: 1.25rem;
    margin-bottom: 1.5rem;
    border: 1px solid var(--border-color);
}

.panel h2 {
    font-size: 1.1rem;
    margin-bottom: 1rem;
    color: var(--light);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.25rem;
    border-radius: var(--border-radius);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    gap: 0.5rem;
    width: 100%;
    margin-top: 0.5rem;
    background-color: var(--primary);
    color: white;
}

.btn:hover {
    background-color: var(--primary-dark);
}

.btn-accent {
    background-color: var(--secondary);
}

.btn-accent:hover {
    background-color: #be185d;
}

.form-group {
    margin-bottom: 1rem;
}

.form-row {
    display: flex;
    gap: 1rem;
}

.form-row .form-group {
    flex: 1;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    color: var(--gray);
    font-weight: 500;
}

input[type="color"] {
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    width: 100%;
    height: 40px;
    border-radius: 8px;
    border: 2px solid var(--border-color);
    cursor: pointer;
    background-color: transparent;
    padding: 0;
}
input[type="color"]::-webkit-color-swatch {
    border-radius: 6px;
    border: none;
}
input[type="color"]::-moz-color-swatch {
    border-radius: 6px;
    border: none;
}


input[type="range"] {
    width: 100%;
    -webkit-appearance: none;
    appearance: none;
    height: 6px;
    border-radius: 3px;
    background: rgba(255, 255, 255, 0.1);
    margin: 0.5rem 0;
    outline: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--primary);
    cursor: pointer;
    border: 3px solid var(--light);
    transition: background-color 0.2s;
}
input[type="range"]::-webkit-slider-thumb:hover {
    background-color: var(--primary-dark);
}

select, input[type="text"], input[type="file"] {
    width: 100%;
    padding: 0.6rem 0.8rem;
    border-radius: var(--border-radius);
    background-color: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border-color);
    color: white;
    font-size: 0.9rem;
    font-family: 'Inter', sans-serif;
}
input[type="file"]::file-selector-button {
    background-color: var(--primary);
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    cursor: pointer;
    margin-right: 1rem;
}

.pattern-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(90px, 1fr));
    gap: 0.75rem;
}

.pattern-option {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 0.75rem;
    border-radius: var(--border-radius);
    background-color: rgba(0, 0, 0, 0.2);
    border: 1px solid transparent;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
}

.pattern-option:hover {
    background-color: rgba(255, 255, 255, 0.05);
    border-color: var(--border-color);
}

.pattern-option input {
    display: none;
}

.pattern-option.selected {
    background-color: var(--primary);
    border-color: var(--primary-dark);
}

.pattern-option span {
    font-size: 0.8rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}
.pattern-option i {
    font-size: 1.2rem;
}

.radio-group {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
}

.radio-option {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
}

.color-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 1rem;
    margin-bottom: 1rem;
}

.color-group {
    position: relative;
}

.delete-color-btn {
    position: absolute;
    top: -8px;
    right: -8px;
    width: 24px;
    height: 24px;
    background-color: #ef4444;
    color: white;
    border: 2px solid var(--dark);
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    transition: var(--transition);
    opacity: 0;
    transform: scale(0.5);
}
.color-group:hover .delete-color-btn {
    opacity: 1;
    transform: scale(1);
}


.preview {
    width: 100%;
    height: 50px;
    border-radius: var(--border-radius);
    margin: 1rem 0;
    background-color: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border-color);
    background-size: cover;
    background-position: center;
}

.loading-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(17, 24, 39, 0.8);
    backdrop-filter: blur(5px);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 20;
}

.loading-overlay.active {
    opacity: 1;
    visibility: visible;
}

.loading-content {
    background-color: var(--dark);
    padding: 2rem;
    border-radius: var(--border-radius);
    text-align: center;
    max-width: 300px;
    box-shadow: var(--box-shadow);
}

.loading-content i {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: var(--primary);
}

.hidden {
    display: none !important;
}

.element-list {
    max-height: 200px;
    overflow-y: auto;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 0.5rem;
}

.element-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.2s;
}
.element-item:hover {
    background-color: rgba(255, 255, 255, 0.05);
}
.element-item.selected {
    background-color: var(--primary);
}
.element-item span {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 150px;
}
.element-item .actions button {
    background: transparent;
    border: none;
    color: var(--gray);
    cursor: pointer;
    padding: 0.25rem;
}
.element-item .actions button:hover {
    color: var(--light);
}


/* =============================================
   RESPONSIVENESS
   ============================================= */
@media (max-width: 1200px) {
    .app-container {
        flex-direction: column;
        height: auto;
    }

    .controls-panel {
        width: 100%;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
        max-height: 50vh;
    }

    .canvas-container {
        min-height: 50vh;
        padding: 1rem;
    }
}

@media (max-width: 768px) {
    .form-row {
        flex-direction: column;
        gap: 0;
    }
}