:root {
    --bg-color: #f0f2f5;
    --panel-bg: #ffffff;
    --primary-color: #d93b3b;
    --secondary-color: #5a67d8;
    --text-color: #333;
    --border-color: #e2e8f0;
    --shadow-color: rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    flex-direction: column;
    height: 100vh;
    overflow: hidden;
}

header {
    background-color: var(--panel-bg);
    padding: 15px 30px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 4px var(--shadow-color);
    flex-shrink: 0;
}

header h1 {
    font-size: 1.5rem;
    color: var(--primary-color);
}

.button {
    background-color: var(--primary-color);
    color: white;
    padding: 10px 20px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: background-color 0.3s ease;
}

.button:hover {
    background-color: #c53030;
}

.button.alt {
    background-color: #718096;
}

.button.alt:hover {
    background-color: #4a5568;
}

main {
    display: flex;
    flex-grow: 1;
    overflow: hidden;
}

#preview-panel {
    flex: 1;
    padding: 20px;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: #e2e8f0;
}

#preview-frame {
    width: 100%;
    height: 100%;
    border: 8px solid var(--panel-bg);
    border-radius: 12px;
    box-shadow: 0 10px 20px rgba(0,0,0,0.2);
    transform: scale(0.95);
    background-color: white;
}

#settings-panel {
    width: 450px;
    flex-shrink: 0;
    background-color: var(--panel-bg);
    overflow-y: auto;
    padding: 20px;
    border-left: 1px solid var(--border-color);
}

#config-form h2 {
    font-size: 1.25rem;
    color: var(--primary-color);
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--primary-color);
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 8px;
    font-size: 0.9rem;
}

.form-group input[type="text"],
.form-group input[type="file"] {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-family: 'Poppins', sans-serif;
}

.form-group input[type="color"] {
    width: 100%;
    height: 40px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 5px;
    cursor: pointer;
}

.color-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

.form-actions {
    margin-top: 30px;
    border-top: 1px solid var(--border-color);
    padding-top: 20px;
    display: flex;
    justify-content: flex-end;
}