:root {
    --bg-color: #121212;
    --panel-bg: #1a1a1a;
    --accent: #d4a373;
    --text: #e5e5e5;
    --border: #333;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text);
    font-family: 'Manrope', system-ui, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

.container {
    width: 100%;
    max-width: 900px;
    padding: 2rem;
}

header {
    margin-bottom: 1.5rem;
    text-align: center;
}

header h1 {
    font-family: 'Unbounded', system-ui, sans-serif;
    font-size: 50px;
    margin-bottom: 0.5rem;
    color: #fff;
    font-weight: 700;
}

header p {
    color: #888;
    font-size: 15px;
}

/* --- Showcase Banner Styling --- */
.showcase-banner {
    margin-bottom: 2rem;
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid var(--border);
    background: #0d0d0d;
    max-height: 250px;
    display: flex;
    justify-content: top;
    align-items: top;
}

.showcase-banner img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.workspace {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 2rem;
    background: var(--panel-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 2rem;
}

.controls {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.slider-group {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.9rem;
    color: #aaa;
    background: #222;
    padding: 0.75rem 1rem;
    border-radius: 6px;
    border: 1px solid var(--border);
}

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

.btn {
    display: block;
    text-align: center;
    padding: 0.85rem 1rem;
    border-radius: 6px;
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    text-decoration: none;
    transition: background 0.2s, transform 0.1s;
}

.upload-btn {
    background: #2a2a2a;
    color: #fff;
    border: 1px solid #444;
}

.upload-btn:hover {
    background: #333;
    border-color: #666;
}

.download-btn {
    background: var(--accent);
    color: #121212;
}

.download-btn:hover {
    opacity: 0.9;
}

.download-btn.disabled {
    background: #222;
    color: #555;
    border: 1px solid var(--border);
    opacity: 0.5;
    pointer-events: none;
}

.preview-pane {
    background: #0d0d0d;
    border: 1px dashed var(--border);
    border-radius: 8px;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    min-height: 400px;
    overflow: hidden;
}

canvas {
    max-width: 100%;
    max-height: 500px;
    display: none;
}

.placeholder {
    color: #555;
    font-size: 0.9rem;
}