:root {
    --primary: #6366F1;
    --primary-hover: #4F46E5;
    --secondary: #94A3B8;
    --accent: #22D3EE;
    --bg: #0F172A;
    --panel-bg: rgba(30, 41, 59, 0.7);
    --text: #F8FAFC;
    --text-muted: #CBD5E1;
    --border: rgba(71, 85, 105, 0.5);
    --radius: 12px;
}

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

body {
    font-family: 'Inter', system-ui, sans-serif;
    background-color: var(--bg);
    background-image: radial-gradient(circle at 50% 0%, rgba(99, 102, 241, 0.15) 0%, transparent 50%);
    color: var(--text);
    height: 100vh;
    display: flex;
    justify-content: center;
}

.app {
    width: 100%;
    max-width: 1400px;
    height: 100vh;
    display: flex;
    flex-direction: column;
    padding: 1rem;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    margin-bottom: 1rem;
}

h1 {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(to right, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.glass-panel {
    background: var(--panel-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border);
    border-radius: var(--radius);
}

.glass-btn {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text);
    border: 1px solid var(--border);
    padding: 0.6rem 1.2rem;
    border-radius: 8px;
    font-family: inherit;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.glass-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--primary);
}

.glass-btn.small {
    padding: 0.3rem 0.8rem;
    font-size: 0.85rem;
}

.dashboard {
    display: flex;
    gap: 1.5rem;
    flex: 1;
    overflow: hidden;
}

.controls-panel {
    width: 350px;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    overflow-y: auto;
}

.tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    padding: 0.3rem;
    background: rgba(0, 0, 0, 0.2);
    border-radius: 8px;
}

.tab-btn {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-muted);
    padding: 0.5rem;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.2s;
}

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

.control-group {
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
}

.control-group.hidden {
    display: none;
}

.control-item label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}

.badge {
    background: rgba(255, 255, 255, 0.1);
    color: var(--accent);
    width: 16px;
    height: 16px;
    border-radius: 50%;
    display: inline-flex;
    justify-content: center;
    align-items: center;
    font-size: 0.7rem;
    cursor: help;
}

select,
input[type="number"] {
    width: 100%;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border);
    color: var(--text);
    padding: 0.6rem;
    border-radius: 6px;
    font-family: inherit;
    font-size: 0.9rem;
}

select:focus,
input[type="number"]:focus {
    outline: none;
    border-color: var(--primary);
}

.slider-group {
    display: flex;
    align-items: center;
    gap: 1rem;
}

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

.preview-panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.playground {
    flex: 2;
    padding: 2rem;
    overflow: hidden;
    position: relative;
    display: flex;
}

.flex-container {
    display: flex;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.02);
    border: 2px dashed rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    transition: all 0.3s ease;
}

.flex-item {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: white;
    font-weight: 700;
    font-size: 1.5rem;
    display: flex;
    justify-content: center;
    align-items: center;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
    min-width: 60px;
    min-height: 60px;
    padding: 1rem;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    margin: 0;
}

.item-selector-buttons {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-bottom: 1rem;
}

.item-selector-btn {
    width: 40px;
    height: 40px;
    border-radius: 6px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border);
    color: var(--text);
    cursor: pointer;
    font-weight: 600;
}

.item-selector-btn.active {
    background: var(--primary);
    border-color: var(--primary);
}

.code-output {
    flex: 1;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
}

.code-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.code-header h3 {
    font-size: 1rem;
    color: var(--text-muted);
}

pre {
    background: rgba(0, 0, 0, 0.4);
    padding: 1rem;
    border-radius: 8px;
    overflow-y: auto;
    flex: 1;
}

code {
    font-family: 'Fira Code', monospace;
    font-size: 0.9rem;
    color: var(--accent);
}

/* Scrollbar styling */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--secondary);
}