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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    min-height: 100vh;
    color: #fff;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 40px 20px;
}

/* 헤더 */
header {
    text-align: center;
    margin-bottom: 40px;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    background: linear-gradient(90deg, #00d4ff, #7b2cbf);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

header p {
    color: #aaa;
    font-size: 1.1rem;
}

/* 업로드 섹션 */
.upload-section {
    display: flex;
    justify-content: center;
}

.upload-box {
    width: 100%;
    max-width: 600px;
    padding: 60px 40px;
    border: 2px dashed #444;
    border-radius: 16px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    background: rgba(255, 255, 255, 0.03);
}

.upload-box:hover {
    border-color: #00d4ff;
    background: rgba(0, 212, 255, 0.05);
}

.upload-box.dragover {
    border-color: #00d4ff;
    background: rgba(0, 212, 255, 0.1);
    transform: scale(1.02);
}

.upload-icon {
    font-size: 4rem;
    margin-bottom: 20px;
}

.upload-box p {
    font-size: 1.2rem;
    margin-bottom: 10px;
}

.upload-hint {
    color: #666;
    font-size: 0.9rem;
}

/* 처리 섹션 */
.process-section {
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.image-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    margin-bottom: 30px;
}

@media (max-width: 768px) {
    .image-container {
        grid-template-columns: 1fr;
    }
}

.image-box {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 16px;
    padding: 20px;
}

.image-box h3 {
    margin-bottom: 15px;
    font-size: 1rem;
    color: #aaa;
}

.image-wrapper {
    position: relative;
    min-height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    overflow: hidden;
    background: #0a0a0a;
}

.image-wrapper.checkered {
    background-image:
        linear-gradient(45deg, #1a1a1a 25%, transparent 25%),
        linear-gradient(-45deg, #1a1a1a 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, #1a1a1a 75%),
        linear-gradient(-45deg, transparent 75%, #1a1a1a 75%);
    background-size: 20px 20px;
    background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
    background-color: #0d0d0d;
}

.image-wrapper img {
    max-width: 100%;
    max-height: 400px;
    object-fit: contain;
}

/* 로딩 */
.loading {
    text-align: center;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid rgba(255, 255, 255, 0.1);
    border-top-color: #00d4ff;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
}

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

.loading p {
    color: #aaa;
    margin-bottom: 15px;
}

.progress-bar {
    width: 200px;
    height: 6px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
    overflow: hidden;
    margin: 0 auto;
}

.progress {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, #00d4ff, #7b2cbf);
    transition: width 0.3s ease;
}

/* 버튼 */
.button-group {
    display: flex;
    justify-content: center;
    gap: 15px;
}

.btn {
    padding: 14px 32px;
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-primary {
    background: linear-gradient(90deg, #00d4ff, #7b2cbf);
    color: #fff;
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(0, 212, 255, 0.3);
}

.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    color: #fff;
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* 푸터 */
footer {
    text-align: center;
    margin-top: 50px;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

footer p {
    color: #666;
    font-size: 0.9rem;
}

footer .hint {
    margin-top: 8px;
    font-size: 0.75rem;
    color: #555;
}