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

:root {
    --primary: #6c5ce7;
    --primary-hover: #5b4cdb;
    --bg: #0f0f23;
    --card-bg: #1a1a2e;
    --text: #ffffff;
    --text-muted: #a0a0b0;
    --border: #2d2d44;
    --success: #00d9a5;
    --error: #ff6b6b;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    background-image: 
        radial-gradient(ellipse at top, #1a1a3e 0%, transparent 50%),
        radial-gradient(ellipse at bottom right, #2d1f3d 0%, transparent 50%);
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

header {
    text-align: center;
    margin-bottom: 2rem;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    background: linear-gradient(135deg, #a29bfe, #00d9a5);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

main {
    background: var(--card-bg);
    border-radius: 16px;
    padding: 2rem;
    border: 1px solid var(--border);
}

.upload-section {
    border: 2px dashed var(--border);
    border-radius: 12px;
    padding: 3rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
}

.upload-section:hover,
.upload-section.drag-over {
    border-color: var(--primary);
    background: rgba(108, 92, 231, 0.1);
}

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

.upload-icon {
    width: 64px;
    height: 64px;
    color: var(--text-muted);
}

.hint {
    font-size: 0.875rem;
    color: var(--text-muted);
}

.settings {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-top: 1.5rem;
    flex-wrap: wrap;
}

.settings label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex: 1;
    min-width: 250px;
}

.settings input {
    flex: 1;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    border: 1px solid var(--border);
    background: var(--bg);
    color: var(--text);
    font-size: 0.875rem;
}

.settings input:focus {
    outline: none;
    border-color: var(--primary);
}

.btn-primary,
.btn-secondary {
    padding: 0.5rem 1.5rem;
    border-radius: 8px;
    border: none;
    cursor: pointer;
    font-size: 0.875rem;
    transition: all 0.2s;
}

.btn-primary {
    background: var(--primary);
    color: white;
}

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

.btn-secondary {
    background: var(--border);
    color: var(--text);
}

.btn-secondary:hover {
    background: #3d3d54;
}

.status {
    font-size: 0.75rem;
    color: var(--success);
}

.status.error {
    color: var(--error);
}

.preview-section {
    margin-top: 2rem;
}

.image-compare {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

@media (max-width: 600px) {
    .image-compare {
        grid-template-columns: 1fr;
    }
}

.image-box {
    position: relative;
    border-radius: 12px;
    overflow: hidden;
    background: var(--bg);
    border: 1px solid var(--border);
}

.image-box h3 {
    position: absolute;
    top: 1rem;
    left: 1rem;
    background: rgba(0, 0, 0, 0.7);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: normal;
}

.image-box img {
    width: 100%;
    height: auto;
    display: block;
}

.checkerboard {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        linear-gradient(45deg, #ccc 25%, transparent 25%),
        linear-gradient(-45deg, #ccc 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, #ccc 75%),
        linear-gradient(-45deg, transparent 75%, #ccc 75%);
    background-size: 20px 20px;
    background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
    z-index: 0;
}

#resultImage {
    position: relative;
    z-index: 1;
}

.actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-top: 1.5rem;
}

.loading {
    text-align: center;
    padding: 3rem;
}

.spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 1rem;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

footer {
    text-align: center;
    margin-top: 2rem;
    color: var(--text-muted);
    font-size: 0.875rem;
}

footer a {
    color: var(--primary);
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}