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

body {
    font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: #0f0f0f;
    min-height: 100vh;
    padding: 20px;
    position: relative;
    overflow-x: hidden;
}

body::before {
    content: '';
    position: fixed;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: 
        radial-gradient(circle at 20% 50%, rgba(255, 107, 107, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(72, 219, 251, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 40% 20%, rgba(253, 203, 110, 0.15) 0%, transparent 50%);
    animation: gradientShift 15s ease infinite;
    z-index: 0;
}

@keyframes gradientShift {
    0%, 100% { transform: translate(0, 0); }
    50% { transform: translate(-10%, -10%); }
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    background: rgba(255, 255, 255, 0.03);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 24px;
    padding: 50px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    position: relative;
    z-index: 1;
}

.logo {
    text-align: center;
    margin-bottom: 40px;
}

.logo-icon {
    font-size: 3em;
    margin-bottom: 10px;
    display: block;
}

h1 {
    text-align: center;
    color: white;
    margin-bottom: 10px;
    font-size: 2.5em;
    font-weight: 800;
    letter-spacing: -1px;
}

.subtitle {
    text-align: center;
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.95em;
    margin-bottom: 40px;
}

h2 {
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 30px;
    text-align: center;
    font-size: 1.5em;
    font-weight: 600;
}

#uploadSection {
    text-align: center;
    padding: 80px 20px;
}

#imageInput {
    display: none;
}

.upload-btn {
    display: inline-block;
    padding: 18px 50px;
    background: linear-gradient(135deg, #ff6b6b 0%, #ee5a6f 100%);
    color: white;
    border-radius: 50px;
    cursor: pointer;
    font-size: 1.1em;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 10px 30px rgba(255, 107, 107, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.upload-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 15px 40px rgba(255, 107, 107, 0.4);
}

.editor-container {
    display: flex;
    gap: 40px;
    flex-wrap: wrap;
    justify-content: center;
    align-items: flex-start;
}

.canvas-wrapper {
    position: relative;
    display: inline-flex;
    align-items: flex-start;
    gap: 10px;
    border-radius: 12px;
}

.canvas-container {
    position: relative;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

#cropCanvas {
    display: block;
    max-width: 100%;
    height: auto;
    touch-action: none;
    user-select: none;
    -webkit-user-select: none;
}

.row-buttons {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding-top: 10px;
}

.add-row-btn,
.remove-row-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 2px solid rgba(255, 255, 255, 0.3);
    background: rgba(255, 255, 255, 0.1);
    color: white;
    font-size: 1.5em;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    line-height: 1;
}

.add-row-btn {
    border-color: rgba(72, 219, 251, 0.5);
    color: rgba(72, 219, 251, 1);
}

.remove-row-btn {
    border-color: rgba(255, 107, 107, 0.5);
    color: rgba(255, 107, 107, 1);
}

.add-row-btn:hover,
.remove-row-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: scale(1.1);
}

.add-row-btn:hover {
    border-color: rgba(72, 219, 251, 0.8);
    box-shadow: 0 0 15px rgba(72, 219, 251, 0.4);
}

.remove-row-btn:hover {
    border-color: rgba(255, 107, 107, 0.8);
    box-shadow: 0 0 15px rgba(255, 107, 107, 0.4);
}

.grid-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

.grid-line-vertical {
    position: absolute;
    top: 0;
    height: 100%;
    width: 2px;
    background: rgba(255, 255, 255, 0.3);
    box-shadow: 0 0 10px rgba(255, 255, 255, 0.1);
}

.grid-line-horizontal {
    position: absolute;
    left: 0;
    width: 100%;
    height: 2px;
    background: rgba(255, 255, 255, 0.3);
    box-shadow: 0 0 10px rgba(255, 255, 255, 0.1);
}

.controls {
    flex: 1;
    min-width: 280px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    background: rgba(255, 255, 255, 0.03);
    padding: 30px;
    border-radius: 16px;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.controls p {
    color: rgba(255, 255, 255, 0.6);
    text-align: center;
    line-height: 1.6;
    font-size: 0.95em;
}

.process-btn, .reset-btn {
    padding: 16px 35px;
    background: linear-gradient(135deg, #48dbfb 0%, #0abde3 100%);
    color: white;
    border: none;
    border-radius: 50px;
    font-size: 1.05em;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 10px 30px rgba(72, 219, 251, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.process-btn:hover, .reset-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 15px 40px rgba(72, 219, 251, 0.4);
}

.result-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 25px;
    margin-bottom: 40px;
}

.result-item {
    display: flex;
    flex-direction: column;
    gap: 15px;
    align-items: center;
    background: rgba(255, 255, 255, 0.03);
    padding: 20px;
    border-radius: 16px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: all 0.3s ease;
}

.result-item:hover {
    transform: translateY(-5px);
    border-color: rgba(255, 255, 255, 0.2);
}

.result-item canvas {
    width: 100%;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.result-item button {
    padding: 12px 28px;
    background: rgba(255, 255, 255, 0.1);
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 25px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
    font-size: 0.95em;
}

.result-item button:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: scale(1.05);
}

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

.download-all-btn {
    background: linear-gradient(135deg, #fdcb6e 0%, #e17055 100%) !important;
    box-shadow: 0 10px 30px rgba(253, 203, 110, 0.3) !important;
}

.download-all-btn:hover {
    box-shadow: 0 15px 40px rgba(253, 203, 110, 0.4) !important;
}

.mobile-only {
    display: none;
}

.desktop-only {
    display: block;
}

.ad-container {
    margin: 30px 0;
    min-height: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.02);
    border: 1px dashed rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    padding: 20px;
}

.ad-top {
    margin-bottom: 40px;
}

.ad-middle {
    margin: 40px 0;
}

.ad-bottom {
    margin-top: 40px;
}

    @media (max-width: 768px) {
    .mobile-only {
        display: block;
    }
    
    .desktop-only {
        display: none !important;
    }
    
    body {
        padding: 10px;
    }
    
    .container {
        padding: 20px 15px;
        border-radius: 16px;
    }
    
    h1 {
        font-size: 1.8em;
    }
    
    .logo-icon {
        font-size: 2.5em;
    }
    
    .subtitle {
        font-size: 0.9em;
    }
    
    .upload-btn {
        padding: 16px 40px;
        font-size: 1em;
        width: 100%;
        max-width: 300px;
    }
    
    #uploadSection {
        padding: 40px 15px;
    }
    
    .editor-container {
        flex-direction: column;
        gap: 20px;
    }
    
    .canvas-wrapper {
        width: 100%;
        max-width: 100%;
        flex-direction: column;
    }
    
    .canvas-container {
        width: 100%;
    }
    
    .row-buttons {
        flex-direction: row;
        justify-content: center;
        padding-top: 0;
    }
    
    .grid-overlay {
        width: 100%;
    }
    
    #cropCanvas {
        width: 100%;
        height: auto;
        border-radius: 8px;
    }
    
    .controls {
        min-width: 100%;
        padding: 20px;
    }
    
    .controls p {
        font-size: 0.9em;
        line-height: 1.8;
    }
    
    .process-btn, .reset-btn {
        padding: 14px 30px;
        font-size: 1em;
        width: 100%;
    }
    
    .result-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .result-item {
        padding: 15px;
    }
    
    .result-item button {
        width: 100%;
        padding: 12px 24px;
        font-size: 0.95em;
    }
    
    .result-item small {
        display: block;
        text-align: center;
        margin-top: 5px;
    }
    
    .button-group {
        flex-direction: column;
        gap: 12px;
    }
    
    .button-group button {
        width: 100%;
    }
    
    h2 {
        font-size: 1.3em;
    }
    
    .ad-container {
        margin: 20px 0;
        min-height: 80px;
        padding: 15px;
    }
}

/* PWA 설치 안내 박스 */
.info-box {
    padding: 20px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 16px;
}

.install-detail {
    background: rgba(255, 255, 255, 0.05);
    padding: 15px;
    border-radius: 10px;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.install-detail summary {
    cursor: pointer;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.9);
    transition: color 0.3s ease;
}

.install-detail summary:hover {
    color: #48dbfb;
}

.install-detail ol {
    margin-top: 10px;
    padding-left: 20px;
    line-height: 1.8;
    color: rgba(255, 255, 255, 0.7);
}

.install-detail ol li {
    margin: 5px 0;
}

.install-detail ol strong {
    color: rgba(255, 255, 255, 0.9);
}