:root {
    --primary: #4a90e2;
    --secondary: #50e3c2;
    --dark: #2c3e50;
    --light: #f4f7f6;
}

body {
    font-family: 'Segoe UI', sans-serif;
    background-color: var(--light);
    margin: 0;
    display: flex;
    justify-content: center;
}

.app-container {
    width: 100%;
    max-width: 500px;
    padding: 20px;
    background: white;
    min-height: 100vh;
    box-shadow: 0 0 20px rgba(0,0,0,0.1);
}

header h1 { color: var(--dark); text-align: center; margin-bottom: 5px; }
header p { text-align: center; color: #666; font-size: 0.9rem; }

.canvas-wrapper {
    width: 100%;
    margin: 20px 0;
    background: #eee;
    display: flex;
    justify-content: center;
    overflow: hidden;
    border-radius: 12px;
    touch-action: none; /* Penting untuk zoom di mobile */
}

.control-group { margin-bottom: 15px; }
.control-group label { display: block; font-weight: bold; margin-bottom: 8px; font-size: 0.9rem; }

.frame-selector { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 10px; }
.frame-selector button {
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 5px;
    background: white;
    cursor: pointer;
}

input[type="range"] { width: 100%; }

.btn-primary {
    width: 100%;
    padding: 12px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 8px;
    font-weight: bold;
    margin-top: 10px;
}

.btn-secondary {
    width: 100%;
    padding: 10px;
    background: #f1f1f1;
    color: var(--dark);
    border: none;
    border-radius: 8px;
    margin-top: 10px;
}