:root {
    --bg: #050510;
    --card-bg: rgba(20, 25, 40, 0.7);
    --border: rgba(255, 255, 255, 0.1);
    --primary: #00ffff;
    --text: #f0f4f8;
    --text-muted: #9aa8b8;
}

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

body {
    background-color: var(--bg);
    color: var(--text);
    font-family: 'Inter', sans-serif;
    overflow: hidden;
    /* Hide scrollbars, canvas will take full screen */
}

.hidden {
    display: none !important;
}

/* UI Positioning */
#ui-container {
    position: absolute;
    top: 20px;
    left: 20px;
    z-index: 10;
    width: 380px;
    max-width: calc(100vw - 40px);
}

.glass-panel {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 24px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
    display: flex;
    flex-direction: column;
    gap: 16px;
}

h1 {
    font-size: 1.8rem;
    font-weight: 600;
    letter-spacing: -0.5px;
}

.highlight {
    color: var(--primary);
}

p {
    font-size: 0.95rem;
    color: var(--text-muted);
    line-height: 1.5;
}

/* Upload Zone */
.upload-zone {
    border: 2px dashed var(--border);
    border-radius: 8px;
    padding: 30px 20px;
    text-align: center;
    transition: all 0.3s ease;
    cursor: pointer;
    background: rgba(0, 0, 0, 0.2);
}

.upload-zone:hover,
.upload-zone.dragover {
    border-color: var(--primary);
    background: rgba(0, 255, 255, 0.05);
}

.btn {
    background: var(--primary);
    color: #000;
    font-family: inherit;
    font-weight: 600;
    font-size: 1rem;
    border: none;
    border-radius: 6px;
    padding: 12px 24px;
    cursor: pointer;
    transition: transform 0.2s;
    box-shadow: 0 4px 15px rgba(0, 255, 255, 0.3);
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 255, 255, 0.4);
}

.drop-text {
    margin-top: 10px;
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* Controls */
.controls {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-top: 10px;
    border-top: 1px solid var(--border);
    padding-top: 16px;
    max-height: 40vh;
    overflow-y: auto;
    padding-right: 5px;
}

/* Custom Scrollbar */
.controls::-webkit-scrollbar {
    width: 6px;
}

.controls::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.2);
    border-radius: 4px;
}

.control-row {
    display: flex;
    gap: 10px;
}

.half {
    flex: 1;
}

.input-select {
    width: 100%;
    padding: 8px;
    background: rgba(0, 0, 0, 0.5);
    border: 1px solid var(--border);
    color: var(--text);
    border-radius: 4px;
    outline: none;
    font-family: inherit;
}

.input-select:focus {
    border-color: var(--primary);
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.control-group label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text);
}

input[type="range"] {
    width: 100%;
    accent-color: var(--primary);
}

input[type="color"] {
    width: 40px;
    height: 30px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    background: none;
}

.tip {
    font-size: 0.8rem;
    color: var(--text-muted);
    text-align: center;
    margin-top: 10px;
    opacity: 0.8;
}

/* Canvas Container */
#canvas-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: 1;
    /* Below UI */
}