:root {
    --primary-color: #ff5e9e;
    --secondary-color: #ffb6c1;
    --accent-color: #ff6b6b;
    --background-color: #f8f9fa;
    --card-background: #ffffff;
    --text-color: #333333;
    --text-secondary: #666666;
    --border-color: #e0e0e0;
    --success-color: #4caf50;
    --warning-color: #ff9800;
    --error-color: #f44336;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 8px 15px rgba(0, 0, 0, 0.2);
}

[data-theme="dark"] {
    --primary-color: #ff7eb6;
    --secondary-color: #ffb6c1;
    --accent-color: #ff6b6b;
    --background-color: #1a1a1a;
    --card-background: #2a2a2a;
    --text-color: #f0f0f0;
    --text-secondary: #b0b0b0;
    --border-color: #444444;
    --success-color: #66bb6a;
    --warning-color: #ffa726;
    --error-color: #ef5350;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
    --shadow-hover: 0 8px 15px rgba(0, 0, 0, 0.4);
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
    overflow-x: hidden;
    transition: background-color 0.3s, color 0.3s;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

header {
    background: linear-gradient(to left, var(--secondary-color), var(--primary-color));
    color: white;
    padding: 25px 0;
    box-shadow: var(--shadow);
    position: relative;
    z-index: 1000;
    overflow: hidden;
}

header::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="100" height="100" viewBox="0 0 100 100"><rect width="100" height="100" fill="none"/><path d="M0,0 L100,100 M100,0 L0,100" stroke="rgba(255,255,255,0.1)" stroke-width="0.5"/></svg>');
    background-size: 10px 10px;
    pointer-events: none;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
    position: relative;
    z-index: 2;
}

.header-main {
    display: flex;
    align-items: center;
    gap: 20px;
    flex-wrap: wrap;
}

.header-logo {
    height: 96px;
    width: auto;
    border-radius: 16px;
    display: block;
}

@media (max-width: 968px) {
    .header-main {
        flex-direction: column;
        text-align: center;
        gap: 12px;
    }

    .title-area {
        text-align: center;
    }

    .header-logo {
        height: 96px;
        margin: 0 auto;
    }

    .header-actions {
        margin-top: 8px;
        justify-content: center;
    }
}

.header-main h1 {
    font-size: 2.2rem;
    margin-bottom: 8px;
    letter-spacing: -0.5px;
}

.header-main p {
    font-size: 1rem;
    opacity: 0.9;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
    background: rgba(0, 0, 0, 0.1);
    padding: 5px 10px;
    border-radius: 60px;
    backdrop-filter: blur(8px);
}

.github-button, .theme-toggle {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(255, 255, 255, 0.2);
    border: none;
    border-radius: 40px;
    padding: 8px 18px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.25s ease;
    color: white;
    text-decoration: none;
    font-family: inherit;
    backdrop-filter: blur(4px);
}

.github-button i, .theme-toggle i {
    font-size: 1.2rem;
}

.github-button span {
    display: inline-block;
}

.theme-toggle {
    padding: 8px;
    border-radius: 50%;
    width: 44px;
    justify-content: center;
}

.github-button:hover, .theme-toggle:hover {
    background: rgba(255, 255, 255, 0.35);
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
}

.main-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    margin-top: 30px;
}

.panel {
    background-color: var(--card-background);
    border-radius: 12px;
    padding: 25px;
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
    transition: background-color 0.3s;
}

.panel-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 2px solid var(--border-color);
}

.panel-title {
    font-size: 1.5rem;
    color: var(--primary-color);
    font-weight: 600;
}

.upload-area {
    border: 2px dashed var(--border-color);
    border-radius: 10px;
    padding: 40px 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
    background-color: rgba(255, 105, 180, 0.05);
    margin-bottom: 20px;
}

.upload-area:hover {
    border-color: var(--primary-color);
    background-color: rgba(255, 105, 180, 0.1);
}

.upload-area.dragover {
    border-color: var(--accent-color);
    background-color: rgba(255, 107, 107, 0.1);
}

.upload-area.has-image {
    display: none;
}

.upload-icon {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.upload-text {
    font-size: 1.1rem;
    margin-bottom: 10px;
}

.upload-hint {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

input[type="file"] {
    display: none;
}

.image-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 400px;
    border-radius: 10px;
    overflow: hidden;
    background-color: #f5f5f5;
    position: relative;
}

[data-theme="dark"] .image-container {
    background-color: #2a2a2a;
}

.image-container.has-image {
    background-color: transparent;
}

.image-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--text-secondary);
}

.image-placeholder i {
    font-size: 4rem;
    margin-bottom: 15px;
    opacity: 0.3;
}

.preview-image {
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
}

.image-info {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(to top, rgba(0, 0, 0, 0.7), transparent);
    color: white;
    padding: 15px;
    font-size: 0.9rem;
}

.controls-panel {
    grid-column: 1 / -1;
    background-color: var(--card-background);
    border-radius: 12px;
    padding: 25px;
    box-shadow: var(--shadow);
    transition: background-color 0.3s;
}

.controls-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 2px solid var(--border-color);
}

.controls-title {
    font-size: 1.5rem;
    color: var(--primary-color);
    font-weight: 600;
}

.parameters {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 20px;
}

.parameter-group {
    display: flex;
    flex-direction: column;
}

.parameter-label {
    font-weight: 600;
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 5px;
    color: var(--text-color);
}

.parameter-control {
    padding: 10px 15px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 1rem;
    transition: border-color 0.3s;
    background-color: var(--card-background);
    color: var(--text-color);
}

.parameter-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(255, 105, 180, 0.2);
}

.button {
    padding: 12px 24px;
    border: none;
    border-radius: 6px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    justify-content: center;
}

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

.button-primary:hover {
    background-color: var(--secondary-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(255, 105, 180, 0.3);
}

.button-secondary {
    background-color: var(--secondary-color);
    color: white;
}

.button-secondary:hover {
    background-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(255, 182, 193, 0.3);
}

.button-success {
    background-color: var(--success-color);
    color: white;
}

.button-success:hover {
    background-color: #45a049;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(76, 175, 80, 0.3);
}

.button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
}

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

.output-actions {
    margin-top: 20px;
    display: flex;
    gap: 10px;
    justify-content: center;
}

.download-items {
    display: flex;
    gap: 10px;
    justify-content: center;
}

.toast {
    position: fixed;
    bottom: 20px;
    right: 20px;
    padding: 15px 20px;
    border-radius: 6px;
    color: white;
    font-weight: 500;
    box-shadow: var(--shadow);
    transform: translateY(100px);
    opacity: 0;
    transition: transform 0.3s, opacity 0.3s;
    z-index: 1000;
    display: flex;
    align-items: center;
    gap: 10px;
}

.toast.show {
    transform: translateY(0);
    opacity: 1;
}

.toast-success {
    background-color: var(--success-color);
}

.toast-error {
    background-color: var(--error-color);
}

.toast-loading {
    background-color: #607d8b;
}

.toast-warning {
    background-color: var(--warning-color);
}

.loading-spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 1s ease-in-out infinite;
}

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

.hidden {
    display: none !important;
}

footer {
    position: relative;
    z-index: 1000;
    margin-top: 50px;
    padding: 30px 0;
    text-align: center;
    color: var(--text-secondary);
    border-top: 1px solid var(--border-color);
    transition: color 0.3s;
}

.footer-links {
    margin-top: 12px;
    display: flex;
    justify-content: center;
    gap: 24px;
    flex-wrap: wrap;
}

.footer-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: all 0.2s;
    font-size: 0.9rem;
}

.footer-link:hover {
    color: var(--accent-color);
    text-decoration: underline;
    transform: translateY(-1px);
}

@media (max-width: 968px) {
    .main-layout {
        grid-template-columns: 1fr;
    }

    .controls-panel {
        grid-column: 1;
    }

    header .container {
        flex-direction: column;
        text-align: center;
    }

    .header-main {
        text-align: center;
    }

    .header-actions {
        justify-content: center;
    }

    .github-button span {
        display: inline;
    }
}

.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.9);
    z-index: 2000;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.modal.active {
    display: flex;
    opacity: 1;
}

.comparison-container {
    position: relative;
    width: 90%;
    max-width: 1000px;
    height: 80vh;
    background: #1a1a1a;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    display: flex;
    flex-direction: column;
}

.comparison-container .image-container {
    flex: 1;
    position: relative;
    overflow: hidden;
    min-height: 0;
}

.image-wrapper {
    position: relative;
    width: 100%;
    height: 100%;
}

.comparison-image {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.comparison-image:first-child {
    clip-path: polygon(0 0, 50% 0, 50% 100%, 0 100%);
}

.slider {
    position: absolute;
    top: 0;
    left: 50%;
    width: 4px;
    height: 100%;
    background: rgba(255, 255, 255, 0.8);
    z-index: 10;
    transform: translateX(-50%);
    cursor: col-resize;
    transition: background 0.2s;
}

.slider:hover {
    background: white;
    width: 6px;
}

.slider-handle {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 50px;
    height: 50px;
    background: white;
    border-radius: 50%;
    transform: translate(-50%, -50%);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
    color: var(--primary-color);
    font-size: 1.2rem;
}

.comparison-controls {
    padding: 20px;
    background: #2a2a2a;
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    gap: 20px;
}

.comparison-labels {
    grid-column: 2;
    justify-self: center;
    display: flex;
    gap: 20px;
}

.comparison-actions {
    grid-column: 3;
    justify-self: end;
    display: flex;
    gap: 10px;
}

#viewerImage {
    max-width: 95vw;
    max-height: 95vh;
    object-fit: contain;
    border-radius: 8px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
    user-select: none;
    -webkit-user-drag: none;
}

.click-guard {
    position: fixed;
    inset: 0;
    z-index: 999;
    cursor: wait;
}

.click-feedback {
    position: fixed;
    pointer-events: none;
    z-index: 10000;
    color: var(--text-secondary);
    font-size: 1.5rem;
    font-weight: 500;
    animation: clickFade 1.0s ease-out forwards;
}

@keyframes clickFade {
    0%   { opacity: 1; transform: translateY(0); }
    100% { opacity: 0; transform: translateY(-30px); }
}

.click-guard.hidden {
    display: none;
}

@media (max-width: 768px) {
    .comparison-container {
        width: 95%;
        height: 70vh;
    }

    .comparison-controls {
        grid-template-columns: 1fr;
        justify-items: center;
        gap: 15px;
    }

    .comparison-labels {
        grid-column: 1;
    }

    .comparison-actions {
        grid-column: 1;
        justify-self: center;
    }

    .output-actions {
        flex-direction: column;
        align-items: center;
    }

    #compareBtn, .download-items {
        max-width: 320px;
        width: 80%;
    }

    #downloadBtn {
        flex: 1;
    }
}