:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --primary-light: #dbeafe;
    --secondary-color: #7c3aed;
    --success-color: #059669;
    --danger-color: #dc2626;
    --warning-color: #d97706;
    --text-primary: #111827;
    --text-secondary: #4b5563;
    --text-light: #9ca3af;
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-tertiary: #f3f4f6;
    --border-color: #e5e7eb;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --transition: all 0.2s ease;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: #f0f4f8;
    min-height: 100vh;
    color: var(--text-primary);
    line-height: 1.6;
}

.app-container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 20px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.header {
    text-align: center;
    padding: 30px 0 20px;
}

.header-content {
    max-width: 600px;
    margin: 0 auto;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-bottom: 10px;
}

.logo i {
    font-size: 2rem;
    color: var(--primary-color);
}

.logo h1 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
}

.subtitle {
    font-size: 1rem;
    color: var(--text-secondary);
}

.main-content {
    flex: 1;
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: 28px;
    margin-bottom: 20px;
    border: 1px solid var(--border-color);
}

.upload-section {
    margin-bottom: 28px;
}

.upload-tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 16px;
    background: var(--bg-tertiary);
    padding: 4px;
    border-radius: var(--radius-md);
}

.tab-btn {
    flex: 1;
    padding: 10px 18px;
    border: none;
    background: transparent;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

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

.tab-btn.active {
    background: var(--bg-primary);
    color: var(--primary-color);
    box-shadow: var(--shadow-sm);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

.drop-zone {
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-lg);
    padding: 50px 30px;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    background: var(--bg-secondary);
}

.drop-zone:hover,
.drop-zone.drag-over {
    border-color: var(--primary-color);
    background: var(--primary-light);
}

.drop-zone i {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 16px;
}

.drop-zone p {
    font-size: 1.05rem;
    color: var(--text-primary);
    margin-bottom: 6px;
}

.file-hint {
    font-size: 0.85rem;
    color: var(--text-light);
}

.code-input-wrapper {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.code-input-wrapper textarea {
    width: 100%;
    min-height: 180px;
    padding: 14px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-family: 'SF Mono', 'Consolas', 'Courier New', monospace;
    font-size: 0.9rem;
    resize: vertical;
    transition: var(--transition);
    background: var(--bg-secondary);
}

.code-input-wrapper textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    background: var(--bg-primary);
}

.btn {
    padding: 10px 18px;
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

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

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

.btn-primary:hover:not(:disabled) {
    background: var(--primary-hover);
}

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

.btn-secondary:hover:not(:disabled) {
    background: var(--text-primary);
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
}

.btn-outline:hover:not(:disabled) {
    border-color: var(--primary-color);
    color: var(--primary-color);
    background: var(--primary-light);
}

.btn-danger {
    border-color: var(--danger-color);
    color: var(--danger-color);
}

.btn-danger:hover:not(:disabled) {
    background: var(--danger-color);
    color: white;
}

.btn-large {
    padding: 14px 36px;
    font-size: 1rem;
}

.file-list-section {
    margin-bottom: 28px;
}

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 14px;
    flex-wrap: wrap;
    gap: 10px;
}

.section-header h2 {
    font-size: 1.1rem;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 10px;
}

.section-header h2 i {
    color: var(--primary-color);
}

.batch-actions {
    display: flex;
    gap: 8px;
}

.file-list {
    display: grid;
    gap: 8px;
    max-height: 280px;
    overflow-y: auto;
    padding-right: 8px;
}

.file-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 14px;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    border: 1px solid transparent;
    transition: var(--transition);
    cursor: pointer;
}

.file-item:hover {
    border-color: var(--border-color);
}

.file-item.selected {
    background: var(--primary-light);
    border-color: var(--primary-color);
}

.file-checkbox {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: var(--primary-color);
}

.file-preview {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-sm);
    background: var(--bg-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.file-preview img,
.file-preview svg {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

.file-info {
    flex: 1;
    min-width: 0;
}

.file-name {
    font-weight: 500;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    font-size: 0.95rem;
}

.file-size {
    font-size: 0.8rem;
    color: var(--text-light);
}

.file-remove {
    padding: 6px;
    background: transparent;
    border: none;
    color: var(--text-light);
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.file-remove:hover {
    background: rgba(220, 38, 38, 0.1);
    color: var(--danger-color);
}

.settings-section {
    margin-bottom: 28px;
}

.settings-section h2 {
    font-size: 1.1rem;
    color: var(--text-primary);
    margin-bottom: 18px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.settings-section h2 i {
    color: var(--primary-color);
}

.settings-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}

.setting-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.setting-group label {
    font-weight: 500;
    color: var(--text-primary);
    font-size: 0.9rem;
}

.setting-group input[type="text"],
.setting-group input[type="number"],
.setting-group select {
    padding: 9px 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    transition: var(--transition);
    background: var(--bg-primary);
}

.setting-group input:focus,
.setting-group select:focus {
    outline: none;
    border-color: var(--primary-color);
}

.setting-group input[type="range"] {
    width: 100%;
    accent-color: var(--primary-color);
}

.setting-group input[type="range"] + span {
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-align: right;
}

.input-with-unit {
    display: flex;
    gap: 0;
    width: 100%;
}

.input-with-unit input {
    flex: 1;
    min-width: 0;
    border-radius: var(--radius-md) 0 0 var(--radius-md);
    border-right: none;
}

.input-with-unit select {
    width: 70px;
    min-width: 70px;
    flex-shrink: 0;
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    background: var(--bg-tertiary);
    font-size: 0.85rem;
    cursor: pointer;
}

.input-with-unit input:focus,
.input-with-unit select:focus {
    border-color: var(--primary-color);
    z-index: 1;
    position: relative;
}

.color-input-wrapper {
    display: flex;
    gap: 8px;
    align-items: center;
    flex-wrap: wrap;
}

.color-input-wrapper input[type="color"] {
    width: 44px;
    height: 38px;
    padding: 0;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
}

.color-input-wrapper input[type="text"] {
    width: 90px;
    padding: 9px 10px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 0.85rem;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 6px;
    cursor: pointer;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.checkbox-label input[type="checkbox"] {
    width: 16px;
    height: 16px;
    accent-color: var(--primary-color);
}

.preview-section {
    margin-bottom: 28px;
}

.preview-section h2 {
    font-size: 1.1rem;
    color: var(--text-primary);
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.preview-section h2 i {
    color: var(--primary-color);
}

.preview-container {
    display: flex;
    gap: 16px;
    align-items: center;
    flex-wrap: wrap;
}

.preview-item {
    flex: 1;
    min-width: 180px;
}

.preview-item h3 {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.preview-box {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    min-height: 180px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    background-image: 
        linear-gradient(45deg, #e5e7eb 25%, transparent 25%),
        linear-gradient(-45deg, #e5e7eb 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, #e5e7eb 75%),
        linear-gradient(-45deg, transparent 75%, #e5e7eb 75%);
    background-size: 16px 16px;
    background-position: 0 0, 0 8px, 8px -8px, -8px 0px;
}

.preview-box img,
.preview-box svg {
    max-width: 100%;
    max-height: 260px;
    object-fit: contain;
}

.preview-arrow {
    font-size: 1.5rem;
    color: var(--text-light);
}

.action-section {
    text-align: center;
    margin-bottom: 28px;
}

.progress-section {
    margin-bottom: 28px;
    padding: 18px;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.progress-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 10px;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.progress-bar {
    height: 6px;
    background: var(--border-color);
    border-radius: 3px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: var(--primary-color);
    border-radius: 3px;
    transition: width 0.3s ease;
    width: 0%;
}

.results-section {
    margin-bottom: 28px;
}

.results-section h2 {
    font-size: 1.1rem;
    color: var(--success-color);
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.results-list {
    display: grid;
    gap: 12px;
    margin-bottom: 18px;
}

.result-item {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 14px;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.result-preview {
    width: 70px;
    height: 70px;
    border-radius: var(--radius-sm);
    background: var(--bg-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.result-preview img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

.result-info {
    flex: 1;
}

.result-name {
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.result-details {
    font-size: 0.8rem;
    color: var(--text-light);
}

.result-actions {
    display: flex;
    gap: 8px;
}

.results-actions {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
}

.footer {
    text-align: center;
    padding: 16px;
    color: var(--text-secondary);
}

.footer p {
    font-size: 0.85rem;
}

.toast-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.toast {
    padding: 14px 18px;
    background: var(--bg-primary);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: 10px;
    animation: slideIn 0.3s ease;
    max-width: 320px;
    border: 1px solid var(--border-color);
}

.toast.success {
    border-left: 3px solid var(--success-color);
}

.toast.error {
    border-left: 3px solid var(--danger-color);
}

.toast.warning {
    border-left: 3px solid var(--warning-color);
}

.toast i {
    font-size: 1.1rem;
}

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

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

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

.toast-message {
    flex: 1;
    font-size: 0.9rem;
    color: var(--text-primary);
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes slideOut {
    from {
        transform: translateX(0);
        opacity: 1;
    }
    to {
        transform: translateX(100%);
        opacity: 0;
    }
}

.toast.hiding {
    animation: slideOut 0.3s ease forwards;
}

@media (max-width: 768px) {
    .app-container {
        padding: 10px;
    }

    .header {
        padding: 16px 0;
    }

    .logo h1 {
        font-size: 1.35rem;
    }

    .logo i {
        font-size: 1.6rem;
    }

    .subtitle {
        font-size: 0.9rem;
    }

    .main-content {
        padding: 16px 14px;
    }

    .upload-tabs {
        flex-direction: column;
    }

    .tab-btn {
        width: 100%;
    }

    .drop-zone {
        padding: 36px 20px;
    }

    .drop-zone i {
        font-size: 2.5rem;
    }

    .drop-zone p {
        font-size: 0.95rem;
    }

    .settings-grid {
        grid-template-columns: 1fr;
    }

    .preview-container {
        flex-direction: column;
    }

    .preview-arrow {
        transform: rotate(90deg);
    }

    .section-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .batch-actions {
        width: 100%;
    }

    .batch-actions .btn {
        flex: 1;
    }

    .file-item {
        flex-wrap: wrap;
    }

    .file-preview {
        width: 36px;
        height: 36px;
    }

    .result-item {
        flex-wrap: wrap;
    }

    .result-preview {
        width: 50px;
        height: 50px;
    }

    .result-actions {
        width: 100%;
        justify-content: flex-end;
    }

    .toast-container {
        left: 10px;
        right: 10px;
    }

    .toast {
        max-width: 100%;
    }

    .input-with-unit select {
        min-width: 55px;
    }
}

@media (max-width: 480px) {
    .logo {
        flex-direction: column;
        gap: 6px;
    }

    .logo h1 {
        font-size: 1.2rem;
    }

    .btn-large {
        width: 100%;
        padding: 12px 18px;
    }

    .color-input-wrapper {
        flex-direction: column;
        align-items: flex-start;
    }

    .color-input-wrapper input[type="text"] {
        width: 100%;
    }

    .results-actions {
        flex-direction: column;
    }

    .results-actions .btn {
        width: 100%;
    }
}

::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-light);
}