:root {
    --bg-color: #0F0F23;
    --card-bg: rgba(30, 30, 50, 0.6);
    --primary-color: #6C5CE7;
    --primary-hover: #5b4dbd;
    --secondary-color: #A29BFE;
    --accent-color: #FD79A8;
    --text-color: #FFFFFF;
    --text-muted: #B2BEC3;
    --border-color: rgba(255, 255, 255, 0.1);
    --selection-color: rgba(108, 92, 231, 0.3);
    --radius: 12px;
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.5;
    overflow: hidden; /* App container handles scrolling */
    height: 100vh;
}

.app-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    max-width: 1600px;
    margin: 0 auto;
}

/* Header */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    background: rgba(15, 15, 35, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 100;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo i {
    color: var(--primary-color);
}

.logo h1 {
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.logo h1 span {
    color: var(--primary-color);
}

.header-actions {
    display: flex;
    gap: 1rem;
}

/* Layout */
main {
    display: grid;
    grid-template-columns: 300px 1fr 300px;
    flex: 1;
    overflow: hidden;
}

.controls {
    padding: 1.5rem;
    background: var(--card-bg);
    border-right: 1px solid var(--border-color);
    overflow-y: auto;
    backdrop-filter: blur(5px);
}

.item-controls {
    border-right: none;
    border-left: 1px solid var(--border-color);
}

/* Sidebar Sections */
.section-title {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.section-title i {
    color: var(--secondary-color);
    width: 20px;
    height: 20px;
}

.section-title h2 {
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-muted);
}

.control-group {
    margin-bottom: 1.25rem;
}

.control-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: var(--text-muted);
}

select, input[type="text"], input[type="number"] {
    width: 100%;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 0.6rem;
    color: var(--text-color);
    font-family: inherit;
    font-size: 0.9rem;
    transition: var(--transition);
}

select:focus, input:focus {
    outline: none;
    border-color: var(--primary-color);
    background: rgba(255, 255, 255, 0.1);
}

/* Range Input */
.range-with-value {
    display: flex;
    align-items: center;
    gap: 10px;
}

input[type="range"] {
    flex: 1;
    accent-color: var(--primary-color);
}

.range-value {
    font-size: 0.8rem;
    min-width: 40px;
    color: var(--primary-color);
}

/* Preview Area */
.preview-area {
    padding: 2rem;
    background-image: 
        radial-gradient(circle at 2px 2px, rgba(255,255,255,0.05) 1px, transparent 0);
    background-size: 32px 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: auto;
}

.preview-container {
    background: rgba(255, 255, 255, 0.02);
    border: 2px dashed var(--border-color);
    border-radius: var(--radius);
    width: 100%;
    height: 100%;
    display: flex;
    padding: 20px;
    transition: var(--transition);
    overflow: visible; /* Flexbox overflow is handled by parent */
}

/* Flex Items */
.flex-item {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 8px;
    min-width: 80px;
    min-height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 700;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    user-select: none;
}

.flex-item:hover {
    transform: scale(1.02);
}

.flex-item.active {
    outline: 3px solid var(--accent-color);
    box-shadow: 0 0 20px rgba(253, 121, 168, 0.4);
}

.flex-item span {
    font-size: 1.2rem;
    text-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.6rem 1rem;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    transition: var(--transition);
    border: none;
}

.btn i {
    width: 16px;
    height: 16px;
}

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

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

.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    color: white;
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.15);
}

.btn-accent {
    background: transparent;
    color: var(--accent-color);
    border: 1px solid var(--accent-color);
}

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

.btn-outline {
    background: transparent;
    color: var(--text-color);
    border: 1px solid var(--border-color);
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.05);
}

.w-full {
    width: 100%;
}

.item-management {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
}

/* Code Export */
.code-export {
    background: #050510;
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--border-color);
    height: 250px;
    display: flex;
    flex-direction: column;
}

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

.tab-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    padding-bottom: 0.25rem;
    border-bottom: 2px solid transparent;
    transition: var(--transition);
}

.tab-btn.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

.code-container {
    position: relative;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 8px;
    border: 1px solid var(--border-color);
    flex: 1;
    overflow: hidden;
    display: flex;
}

.code-container pre {
    padding: 1rem;
    overflow: auto;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.85rem;
    color: var(--secondary-color);
    flex: 1;
}

.copy-btn {
    position: absolute;
    top: 0.5rem;
    right: 0.5rem;
    background: rgba(255, 255, 255, 0.1);
    border: none;
    border-radius: 4px;
    padding: 0.4rem;
    color: var(--text-muted);
    cursor: pointer;
    transition: var(--transition);
}

.copy-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    color: white;
}

/* Presets Dropdown */
.presets-dropdown {
    position: relative;
    display: inline-block;
}

.dropdown-content {
    display: none;
    position: absolute;
    right: 0;
    background-color: #1A1A2E;
    min-width: 180px;
    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.5);
    z-index: 101;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    margin-top: 0.5rem;
}

.dropdown-content button {
    color: var(--text-color);
    padding: 0.75rem 1rem;
    text-decoration: none;
    display: block;
    width: 100%;
    text-align: left;
    background: transparent;
    border: none;
    cursor: pointer;
    font-size: 0.9rem;
    transition: var(--transition);
}

.dropdown-content button:hover {
    background-color: var(--primary-color);
}

.presets-dropdown:hover .dropdown-content,
.dropdown-content.show {
    display: block;
}

/* Utilities */
.hidden {
    display: none;
}

.muted-text {
    color: var(--text-muted);
    font-size: 0.85rem;
    font-style: italic;
}

.dual-input {
    display: flex;
    gap: 0.5rem;
}

/* Responsive */
@media (max-width: 1024px) {
    main {
        grid-template-columns: 250px 1fr;
    }
    .item-controls {
        position: fixed;
        right: 0;
        top: 70px;
        bottom: 120px;
        width: 280px;
        z-index: 90;
        transform: translateX(100%);
        transition: transform 0.3s ease;
    }
    .item-controls.active {
        transform: translateX(0);
    }
}

@media (max-width: 768px) {
    main {
        grid-template-columns: 1fr;
    }
    .container-controls {
        display: none; /* Mobile would need a different approach, e.g. bottom sheet or drawer */
    }
}