:root {
    --bg-color: #050505;
    --surface-color: #121212;
    --text-primary: #ffffff;
    --text-secondary: #a1a1aa;
    --accent-color: #3b82f6;
    --border-color: #27272a;
    --font-main: 'Outfit', 'Noto Sans SC', sans-serif;
}

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

body {
    font-family: var(--font-main);
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 2rem;
}

.app-container {
    background-color: var(--surface-color);
    border-radius: 24px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    width: 100%;
    max-width: 1300px;
    padding: 3rem;
    border: 1px solid var(--border-color);
}

header {
    text-align: center;
    margin-bottom: 3rem;
}

header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    margin-bottom: 0.5rem;
    background: linear-gradient(135deg, #fff 0%, #cbd5e1 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -0.02em;
}

header p {
    color: var(--text-secondary);
}

main {
    display: grid;
    grid-template-columns: 350px 1fr;
    gap: 3rem;
    align-items: start;
}

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

.input-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.input-group label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
}

textarea {
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1rem;
    color: var(--text-primary);
    font-family: var(--font-main);
    font-size: 1rem;
    resize: vertical;
    transition: all 0.2s ease;
}

textarea:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.2);
}

.theme-options {
    margin-top: 0.5rem;
}

.theme-options label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
    display: block;
    margin-bottom: 0.5rem;
}

.color-chips {
    display: flex;
    gap: 0.75rem;
}

.chip {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 2px solid transparent;
    cursor: pointer;
    transition: transform 0.2s;
    position: relative;
}

.chip:hover {
    transform: scale(1.1);
}

.chip.active::after {
    content: '';
    position: absolute;
    top: -4px;
    right: -4px;
    bottom: -4px;
    left: -4px;
    border-radius: 50%;
    border: 2px solid var(--text-primary);
    box-shadow: 0 0 10px var(--accent-color);
}

.primary-btn {
    margin-top: 1rem;
    background: linear-gradient(135deg, var(--accent-color) 0%, #2563eb 100%);
    color: white;
    border: none;
    padding: 1rem;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.5rem;
    transition: opacity 0.2s;
}

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

.preview-area {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.canvas-wrapper {
    width: 100%;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    line-height: 0;
    background: #000;
}

/* Make canvas responsive but maintain aspect ratio in view */
canvas {
    width: 100% !important;
    height: auto !important;
    display: block;
}

.preview-hint {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

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

    .app-container {
        padding: 1.5rem;
    }
}

.style-selector {
    display: flex;
    gap: 1rem;
    margin-top: 0.5rem;
}

.radio-label {
    cursor: pointer;
}

.radio-label input {
    display: none;
}

.radio-btn {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-secondary);
    font-size: 0.9rem;
    transition: all 0.2s;
}

.radio-label input:checked+.radio-btn {
    background: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
    box-shadow: 0 0 10px var(--accent-color);
}