:root {
    --bg-color: #121212;
    --panel-bg: rgba(30, 30, 30, 0.8);
    --text-color: #e0e0e0;
    --accent-color: #00e5ff;
    --accent-hover: #00b8cc;
    --border-color: #333;
    --font-family: 'Inter', sans-serif;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-family);
    height: 100vh;
    overflow: hidden;
}

.app-container {
    display: flex;
    height: 100%;
}

/* Sidebar */
.sidebar {
    width: 320px;
    background: var(--panel-bg);
    backdrop-filter: blur(10px);
    border-right: 1px solid var(--border-color);
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    overflow-y: auto;
}

.sidebar-header h1 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--accent-color);
    margin-bottom: 20px;
}

.sidebar-header h1 span {
    font-size: 0.8em;
    opacity: 0.7;
    color: #fff;
}

.control-group {
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 20px;
}

.control-group:last-child {
    border-bottom: none;
}

.control-group h3 {
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 12px;
    color: #888;
}

/* Inputs & Sliders */
.file-input-wrapper {
    margin-bottom: 10px;
}

input[type="file"] {
    display: none;
}

.slider-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
    font-size: 0.85rem;
}

.slider-row input[type="range"] {
    width: 60%;
}

select {
    background: #222;
    color: white;
    border: 1px solid #444;
    padding: 4px 8px;
    border-radius: 4px;
    width: 100%;
}

/* Buttons */
.btn {
    display: block;
    width: 100%;
    padding: 10px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.2s;
    text-align: center;
    text-decoration: none;
    font-size: 0.9rem;
}

.btn-primary {
    background: var(--accent-color);
    color: #000;
}

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

.btn-secondary {
    background: #333;
    color: white;
}

.btn-secondary:hover {
    background: #444;
}

.btn-success {
    background: #00c853;
    color: white;
}

.btn-success:hover {
    background: #009624;
}

.btn-icon {
    width: auto;
    padding: 8px 16px;
    font-size: 1.2rem;
    background: #333;
    color: white;
}

.btn-icon:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.btn-group {
    display: flex;
    gap: 10px;
    margin-top: 10px;
}

.action-buttons {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.toggle-group {
    display: flex;
    gap: 20px;
}

.radio-label {
    display: flex;
    align-items: center;
    gap: 6px;
    cursor: pointer;
    font-size: 0.9rem;
}

/* Workspace */
.workspace {
    flex: 1;
    display: flex;
    flex-direction: column;
    position: relative;
    background-image:
        linear-gradient(45deg, #1a1a1a 25%, transparent 25%),
        linear-gradient(-45deg, #1a1a1a 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, #1a1a1a 75%),
        linear-gradient(-45deg, transparent 75%, #1a1a1a 75%);
    background-size: 20px 20px;
    background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
}

.toolbar {
    height: 50px;
    background: var(--panel-bg);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    padding: 0 20px;
    gap: 20px;
}

.tool-select {
    display: flex;
    background: #111;
    border-radius: 6px;
    padding: 2px;
}

.tool-btn {
    background: transparent;
    border: none;
    color: #888;
    padding: 6px 12px;
    cursor: pointer;
    border-radius: 4px;
    font-size: 0.9rem;
}

.tool-btn.active {
    background: #333;
    color: white;
}

.tool-settings {
    display: flex;
    gap: 15px;
    font-size: 0.85rem;
    align-items: center;
}

.canvas-wrapper {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: auto;
    padding: 40px;
}

canvas {
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.5);
    background: #000;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .app-container {
        flex-direction: column;
        overflow-y: auto;
        /* Allow full page scroll */
    }

    .workspace {
        height: 60vh;
        /* Give canvas enough space */
        min-height: 400px;
        order: 1;
        /* Workspace on top */
    }

    .sidebar {
        width: 100%;
        height: auto;
        order: 2;
        /* Controls below */
        border-right: none;
        border-top: 1px solid var(--border-color);
        padding-bottom: 50px;
        /* Spacer for bottom controls */
    }

    .toolbar {
        height: auto;
        flex-wrap: wrap;
        padding: 10px;
        justify-content: center;
    }

    .tool-settings {
        width: 100%;
        justify-content: center;
        margin-top: 10px;
    }

    .control-group {
        padding: 15px 0;
    }

    .btn {
        padding: 12px;
        /* Larger touch target */
    }
}