:root {
    --bg-dark: #0f172a;
    --bg-panel: #1e293b;
    --bg-input: #0f172a;
    --border: #334155;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --success: #10b981;
}

* {
    box-sizing: border-box;
}

body {
    background-color: var(--bg-dark);
    color: var(--text-main);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    margin: 0;
    line-height: 1.6;
}

header {
    background: var(--bg-panel);
    border-bottom: 1px solid var(--border);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.brand {
    font-weight: 600;
    color: #fff;
    font-size: 1.1rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.brand i {
    color: var(--accent);
}

.nav a {
    color: var(--text-muted);
    text-decoration: none;
    margin-left: 20px;
    font-size: 0.9rem;
}

.nav a:hover {
    color: var(--accent);
}

.tool-container {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 1rem;
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: 1.5rem;
}

@media (max-width: 900px) {
    .tool-container {
        grid-template-columns: 1fr;
    }
}

.panel {
    background: var(--bg-panel);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 1rem;
}

h2 {
    margin-top: 0;
    color: #fff;
    font-size: 1.1rem;
    margin-bottom: 1rem;
}

/* Preview Area */
.preview-area {
    height: 200px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.preview-box {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--accent), #8b5cf6);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Timeline */
.timeline {
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 15px;
    margin-top: 1rem;
}

.timeline-track {
    position: relative;
    height: 40px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 4px;
    margin-bottom: 10px;
}

.keyframe-marker {
    position: absolute;
    top: 50%;
    transform: translate(-50%, -50%);
    width: 16px;
    height: 16px;
    background: var(--accent);
    border-radius: 50%;
    border: 2px solid #fff;
    cursor: pointer;
    transition: transform 0.1s;
}

.keyframe-marker:hover {
    transform: translate(-50%, -50%) scale(1.2);
}

.keyframe-marker.active {
    background: var(--success);
}

.timeline-labels {
    display: flex;
    justify-content: space-between;
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Controls */
.control-group {
    margin-bottom: 12px;
}

.control-group label {
    display: block;
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 5px;
}

.control-group input,
.control-group select {
    width: 100%;
    padding: 8px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: 4px;
    color: var(--text-main);
    font-size: 0.85rem;
}

.control-group input[type="range"] {
    padding: 0;
    height: 6px;
}

.control-group input[type="color"] {
    height: 35px;
    cursor: pointer;
}

.btn {
    background: var(--accent);
    border: none;
    color: #fff;
    padding: 10px 16px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 600;
    width: 100%;
    margin-top: 10px;
}

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

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

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

/* Code Output */
.code-output {
    background: var(--bg-input);
    border: 1px solid var(--border);
    padding: 12px;
    border-radius: 6px;
    font-family: 'Consolas', monospace;
    font-size: 0.75rem;
    color: var(--success);
    max-height: 180px;
    overflow-y: auto;
    white-space: pre-wrap;
    margin-top: 0.5rem;
}

.keyframe-props {
    display: grid;
    gap: 8px;
}

/* Presets */
.presets-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
}

.preset-btn {
    background: var(--bg-input);
    border: 1px solid var(--border);
    color: var(--text-muted);
    padding: 8px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.8rem;
    transition: all 0.2s;
}

.preset-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
}