:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-tertiary: #94a3b8;
    --border-color: #e2e8f0;
    --accent-color: #3b82f6;
    --accent-hover: #2563eb;
    --accent-light: #bfdbfe;
    --card-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    --card-hover-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
    --transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: all 0.2s ease-in-out;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --greeting-color: #475569;
}

.dark-theme {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-tertiary: #94a3b8;
    --border-color: #475569;
    --accent-color: #60a5fa;
    --accent-hover: #93c5fd;
    --accent-light: #1e40af;
    --card-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    --card-hover-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
    --greeting-color: #cbd5e1;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Inter", "PingFang SC", "Microsoft YaHei", "微软雅黑", sans-serif;
}

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    -webkit-transition: var(--transition);
    -moz-transition: var(--transition);
    -ms-transition: var(--transition);
    -o-transition: var(--transition);
    transition: var(--transition);
    min-height: 100vh;
    padding: 24px;
    line-height: 1.5;
    position: relative;
    padding-bottom: 80px;
}

body.no-select {
    user-select: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
}

.header {
    max-width: 1200px;
    margin: 0 auto 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--border-color);
}

.title-container {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.title-row {
    display: flex;
    align-items: center;
    gap: 20px;
}

.main-title {
    font-size: 36px;
    font-weight: 800;
    color: var(--accent-color);
    letter-spacing: -0.8px;
    text-shadow: 0 1px 2px rgba(59, 130, 246, 0.1);
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-icon {
    font-size: 32px;
    line-height: 1;
    animation: iconBounce 3s infinite ease-in-out;
}

@keyframes iconBounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-3px); }
}

.subtitle {
    font-size: 16px;
    color: var(--text-secondary);
    font-weight: 500;
    line-height: 1.6;
    letter-spacing: 0.5px;
    text-shadow: 0 1px 1px rgba(0, 0, 0, 0.02);
    padding-left: 44px;
    max-width: 600px;
}

#backToMainBtn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    text-decoration: none;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-weight: 500;
    font-size: 14px;
    transition: var(--transition);
    cursor: pointer;
    margin-top: 8px;
}

#backToMainBtn:hover {
    background-color: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
    transform: translateY(-1px);
    box-shadow: var(--card-shadow);
}

.theme-switch {
    position: relative;
    width: 64px;
    height: 32px;
    background-color: var(--bg-tertiary);
    border-radius: 16px;
    cursor: pointer;
    border: 1px solid var(--border-color);
    transition: var(--transition);
    display: flex;
    align-items: center;
    padding: 0 2px;
}

.theme-switch::before {
    content: "☀️";
    position: absolute;
    left: 8px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 14px;
    z-index: 1;
}

.theme-switch::after {
    content: "🌙";
    position: absolute;
    right: 8px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 14px;
    z-index: 1;
}

.theme-switch-thumb {
    position: absolute;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background-color: var(--accent-color);
    top: 1px;
    left: 1px;
    transition: var(--transition);
    z-index: 2;
}

.dark-theme .theme-switch-thumb {
    left: calc(100% - 29px);
}

.main-container {
    max-width: 1200px;
    width: 100%;
    margin: 0 auto;
    display: flex;
    gap: 16px;
    padding: 0 16px;
    flex: 1;
    overflow: hidden;
    min-height: 0;
}

.control-panel {
    background-color: var(--bg-secondary);
    border-radius: var(--radius-md);
    padding: 12px;
    border: 1px solid var(--border-color);
    box-shadow: var(--card-shadow);
    width: 280px;
    flex-shrink: 0;
    overflow-y: auto;
    overflow-x: hidden;
    height: calc(100vh - 200px);
}

.control-panel::-webkit-scrollbar {
    width: 6px;
}

.control-panel::-webkit-scrollbar-track {
    background: var(--bg-tertiary);
    border-radius: 3px;
}

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

.control-panel::-webkit-scrollbar-thumb:hover {
    background: var(--accent-color);
}

.control-group {
    margin-bottom: 12px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border-color);
}

.control-group:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.control-label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 6px;
}

.control-input {
    width: 100%;
    padding: 8px 10px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-size: 13px;
    transition: var(--transition);
}

.control-input:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.color-picker {
    display: flex;
    align-items: center;
    gap: 8px;
}

.color-input {
    width: 40px;
    height: 30px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    cursor: pointer;
}

.color-input:hover {
    border-color: var(--accent-color);
}

.range-container {
    display: flex;
    align-items: center;
    gap: 12px;
}

.range-input {
    flex: 1;
    height: 4px;
    background: var(--border-color);
    border-radius: 2px;
    outline: none;
    -webkit-appearance: none;
}

.range-input::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    background: var(--accent-color);
    border-radius: 50%;
    cursor: pointer;
}

.range-value {
    min-width: 36px;
    text-align: center;
    font-size: 12px;
    color: var(--text-secondary);
    font-weight: 500;
    padding: 2px 4px;
    background-color: var(--bg-tertiary);
    border-radius: var(--radius-sm);
}

.button-group {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
    margin-top: 6px;
}

.btn {
    padding: 6px 10px;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    flex: 1;
    min-width: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 4px;
    white-space: nowrap;
}

.btn-primary {
    background-color: var(--accent-color);
    color: white;
    box-shadow: 0 2px 6px rgba(59, 130, 246, 0.15);
}

.btn-primary:hover {
    background-color: var(--accent-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.25);
}

.btn-secondary {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background-color: var(--border-color);
    transform: translateY(-1px);
    box-shadow: var(--card-shadow);
}

.preview-area {
    background-color: var(--bg-secondary);
    border-radius: var(--radius-md);
    padding: 12px;
    border: 1px solid var(--border-color);
    box-shadow: var(--card-shadow);
    display: flex;
    flex-direction: column;
    gap: 8px;
    flex: 1;
    overflow: hidden;
    min-height: 0;
    max-height: calc(100vh - 200px);
    min-width: 0;
}

.presets-sidebar {
    background-color: var(--bg-secondary);
    border-radius: var(--radius-md);
    padding: 12px;
    border: 1px solid var(--border-color);
    box-shadow: var(--card-shadow);
    width: 200px;
    flex-shrink: 0;
    overflow-y: auto;
    overflow-x: hidden;
    max-height: calc(100vh - 200px);
}

.presets-sidebar::-webkit-scrollbar {
    width: 6px;
}

.presets-sidebar::-webkit-scrollbar-track {
    background: var(--bg-tertiary);
    border-radius: 3px;
}

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

.presets-sidebar::-webkit-scrollbar-thumb:hover {
    background: var(--accent-color);
}

.preview-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border-color);
    flex-shrink: 0;
}

.preview-title {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
}

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

.preview-container {
    flex: 1;
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--bg-primary);
    position: relative;
    overflow: hidden;
    min-height: 120px;
    width: 100%;
}

.security-notice {
    text-align: center;
    color: var(--accent-color);
    font-size: 12px;
    font-weight: 500;
    margin-top: 8px;
    padding: 4px 0;
}

.preview-container.has-image {
    border-style: solid;
}

.upload-prompt {
    text-align: center;
    color: var(--text-tertiary);
    cursor: pointer;
    transition: var(--transition);
}

.upload-prompt:hover {
    color: var(--accent-color);
    background-color: var(--bg-tertiary);
}

.upload-icon {
    font-size: 48px;
    margin-bottom: 16px;
}

.upload-prompt p {
    font-size: 14px;
}

.upload-prompt p:last-child {
    font-size: 12px;
    margin-top: 8px;
    opacity: 0.7;
}

.preview-image {
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
    user-select: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    pointer-events: none;
    will-change: transform;
}

.watermark-overlay {
    position: absolute;
    cursor: move;
    user-select: none;
    transform-origin: center;
    border: 2px solid transparent;
    will-change: transform, left, top;
    opacity: 0;
    transition: opacity 0.1s ease;
}

.watermark-overlay.visible {
    opacity: 1;
}

.watermark-overlay:hover {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
    z-index: 200;
}

.watermark-text {
    padding: 12px 18px;
    background-color: transparent;
    color: white;
    border-radius: var(--radius-md);
    white-space: nowrap;
    font-size: 28px;
    font-weight: normal;
    pointer-events: none;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
    font-family: Arial, sans-serif;
}

.watermark-handle {
    position: absolute;
    width: 16px;
    height: 16px;
    background-color: var(--accent-color);
    border-radius: 50%;
    cursor: pointer;
    z-index: 10;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.handle-scale {
    bottom: -8px;
    right: -8px;
    cursor: nw-resize;
}

.handle-rotate {
    top: -8px;
    right: -8px;
    cursor: ne-resize;
}

.watermark-list {
    max-height: 120px;
    overflow-y: auto;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 8px;
    background-color: var(--bg-primary);
    box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.05);
}

.watermark-item {
    padding: 6px 10px;
    margin: 4px 0;
    background-color: var(--bg-secondary);
    border-radius: var(--radius-sm);
    font-size: 13px;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    justify-content: space-between;
    align-items: center;
    border: 1px solid transparent;
}

.watermark-item:hover {
    background-color: var(--accent-light);
    border-color: var(--accent-color);
    transform: translateX(4px);
}

.watermark-item.active {
    background-color: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
    box-shadow: 0 2px 8px rgba(59, 130, 246, 0.2);
}

.watermark-item .watermark-info {
    display: flex;
    align-items: center;
    gap: 8px;
}

.watermark-item .watermark-preview {
    font-weight: 600;
    font-size: 16px;
}

.watermark-item .watermark-details {
    font-size: 12px;
    color: var(--text-tertiary);
    opacity: 0.8;
}

.watermark-item .delete-btn {
    background: none;
    border: none;
    color: var(--text-tertiary);
    cursor: pointer;
    font-size: 16px;
    padding: 4px 8px;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.watermark-item:hover .delete-btn {
    color: var(--text-primary);
    background-color: rgba(0, 0, 0, 0.1);
}

.watermark-item.active .delete-btn {
    color: white;
}

/* 裁剪功能样式 */
.crop-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 50;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.crop-overlay.active {
    opacity: 1;
}

.crop-box {
    position: absolute;
    border: 2px dashed var(--accent-color);
    background-color: rgba(59, 130, 246, 0.1);
    cursor: move;
    min-width: 50px;
    min-height: 50px;
    transition: background-color 0.2s ease, border-color 0.2s ease;
    will-change: left, top, width, height;
}

.crop-box.dragging,
.crop-box.resizing {
    transition: none;
}

.crop-box.dragging {
    cursor: grabbing;
}

.crop-box:hover {
    background-color: rgba(59, 130, 246, 0.2);
}

.crop-handle {
    position: absolute;
    width: 12px;
    height: 12px;
    background-color: var(--accent-color);
    border-radius: 50%;
    z-index: 51;
    transition: var(--transition);
}

.crop-handle:hover {
    transform: scale(1.3);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.3);
}

.crop-handle[data-handle="nw"] { top: -6px; left: -6px; cursor: nw-resize; }
.crop-handle[data-handle="ne"] { top: -6px; right: -6px; cursor: ne-resize; }
.crop-handle[data-handle="sw"] { bottom: -6px; left: -6px; cursor: sw-resize; }
.crop-handle[data-handle="se"] { bottom: -6px; right: -6px; cursor: se-resize; }

.footer-container {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    background-color: var(--bg-primary);
    border-top: 1px solid var(--border-color);
    padding: 12px 24px;
    z-index: 999;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    flex-wrap: wrap;
    gap: 12px 24px;
    color: var(--text-secondary);
    font-size: 13px;
    justify-content: center;
}

.footer-item {
    display: flex;
    align-items: center;
    gap: 6px;
}

.footer-item-label {
    font-weight: 500;
    color: var(--text-primary);
}

.beian-link {
    color: var(--accent-color);
    text-decoration: none;
    transition: var(--transition);
}

.beian-link:hover {
    color: var(--accent-hover);
    text-decoration: underline;
}

/* 详细说明区域样式 */
.info-section {
    margin-top: 60px;
    margin-bottom: 120px;
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.info-card {
    background-color: var(--bg-secondary);
    border-radius: var(--radius-md);
    padding: 24px;
    border: 1px solid var(--border-color);
    box-shadow: var(--card-shadow);
    -webkit-transition: var(--transition);
    -moz-transition: var(--transition);
    -ms-transition: var(--transition);
    -o-transition: var(--transition);
    transition: var(--transition);
}

.info-card:hover {
    box-shadow: var(--card-hover-shadow);
}

.info-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--accent-color);
    margin-bottom: 16px;
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -ms-flex-align: center;
    align-items: center;
    padding-bottom: 12px;
    padding-left: 10px;
    padding-right: 10px;
    border-bottom: 2px solid var(--accent-color);
}

.info-title::before {
    content: "";
    display: inline-block;
    width: 10px;
    height: 10px;
    margin-right: 10px;
    background-color: var(--accent-color);
}

.info-content {
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-orient: vertical;
    -ms-flex-direction: column;
    flex-direction: column;
    gap: 16px;
}

.info-item,
.step-item,
.tech-item,
.faq-item {
    background-color: var(--bg-primary);
    padding: 14px 16px;
    border-radius: var(--radius-sm);
    border-left: 3px solid var(--accent-color);
    -webkit-transition: var(--transition-fast);
    -moz-transition: var(--transition-fast);
    -ms-transition: var(--transition-fast);
    -o-transition: var(--transition-fast);
    transition: var(--transition-fast);
}

.info-item:hover,
.step-item:hover,
.tech-item:hover,
.faq-item:hover {
    border-left-color: var(--accent-hover);
    background-color: var(--bg-tertiary);
}

.info-item h3,
.step-item h3,
.tech-item h3,
.faq-item h3 {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.info-item p,
.step-item p,
.tech-item p,
.faq-item p {
    color: var(--text-secondary);
    line-height: 1.6;
    font-size: 13px;
}

.tips-box {
    background: linear-gradient(135deg, var(--accent-light) 0%, var(--accent-color) 100%);
    padding: 16px 18px;
    border-radius: var(--radius-md);
    color: var(--bg-primary);
}

.tips-box h3 {
    font-size: 15px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--bg-primary);
}

.tips-box ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.tips-box li {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    line-height: 1.5;
}

.tips-box li::before {
    content: '✓';
    font-weight: 700;
    font-size: 14px;
}

@media (max-width: 768px) {
    .info-section {
        margin-top: 40px;
        margin-bottom: 100px;
        gap: 16px;
    }

    .info-card {
        padding: 16px;
    }

    .info-title {
        font-size: 17px;
        margin-bottom: 12px;
        padding-bottom: 10px;
    }

    .info-content {
        gap: 12px;
    }

    .info-item,
    .step-item,
    .tech-item,
    .faq-item {
        padding: 12px;
    }

    .info-item h3,
    .step-item h3,
    .tech-item h3,
    .faq-item h3 {
        font-size: 14px;
        margin-bottom: 6px;
    }

    .info-item p,
    .step-item p,
    .tech-item p,
    .faq-item p {
        font-size: 12px;
    }

    .tips-box {
        padding: 14px;
    }

    .tips-box h3 {
        font-size: 14px;
        margin-bottom: 10px;
    }

    .tips-box li {
        font-size: 12px;
    }
}

/* 说明区域外层容器 - 独立于工具区域 */
.info-section-container {
    max-width: 1200px;
    width: 100%;
    margin: 0 auto;
    padding: 0 16px;
    display: block;
}

/* 工具与说明的分隔样式 */
.section-divider {
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -ms-flex-align: center;
    align-items: center;
    -webkit-box-pack: center;
    -ms-flex-pack: center;
    justify-content: center;
    margin: 60px 0 40px;
    padding: 0 16px;
}

.section-divider::before,
.section-divider::after {
    content: "";
    -webkit-box-flex: 1;
    -ms-flex: 1;
    flex: 1;
    height: 1px;
    background: -webkit-linear-gradient(90deg, transparent, var(--border-color), transparent);
    background: -moz-linear-gradient(90deg, transparent, var(--border-color), transparent);
    background: -ms-linear-gradient(90deg, transparent, var(--border-color), transparent);
    background: -o-linear-gradient(90deg, transparent, var(--border-color), transparent);
    background: linear-gradient(90deg, transparent, var(--border-color), transparent);
}

.divider-line {
    display: none;
}

.divider-text {
    text-align: center;
    padding: 0 24px;
}

.divider-text > span:first-child {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-secondary);
    display: block;
    margin-bottom: 4px;
}

.divider-hint {
    font-size: 12px;
    color: var(--text-tertiary);
    display: block;
    -webkit-animation: bounceDown 2s ease-in-out infinite;
    -moz-animation: bounceDown 2s ease-in-out infinite;
    -ms-animation: bounceDown 2s ease-in-out infinite;
    -o-animation: bounceDown 2s ease-in-out infinite;
    animation: bounceDown 2s ease-in-out infinite;
}

@-webkit-keyframes bounceDown {
    0%, 100% {
        -webkit-transform: translateY(0);
        transform: translateY(0);
        opacity: 0.6;
    }
    50% {
        -webkit-transform: translateY(4px);
        transform: translateY(4px);
        opacity: 1;
    }
}

@-moz-keyframes bounceDown {
    0%, 100% {
        -moz-transform: translateY(0);
        transform: translateY(0);
        opacity: 0.6;
    }
    50% {
        -moz-transform: translateY(4px);
        transform: translateY(4px);
        opacity: 1;
    }
}

@-ms-keyframes bounceDown {
    0%, 100% {
        -ms-transform: translateY(0);
        transform: translateY(0);
        opacity: 0.6;
    }
    50% {
        -ms-transform: translateY(4px);
        transform: translateY(4px);
        opacity: 1;
    }
}

@keyframes bounceDown {
    0%, 100% {
        -webkit-transform: translateY(0);
        -moz-transform: translateY(0);
        -ms-transform: translateY(0);
        transform: translateY(0);
        opacity: 0.6;
    }
    50% {
        -webkit-transform: translateY(4px);
        -moz-transform: translateY(4px);
        -ms-transform: translateY(4px);
        transform: translateY(4px);
        opacity: 1;
    }
}

@media (max-width: 768px) {
    .info-section-container {
        padding: 0 12px;
    }

    .section-divider {
        margin: 40px 0 20px;
        padding: 0 12px;
    }

    .divider-text > span:first-child {
        font-size: 14px;
    }

    .divider-hint {
        font-size: 11px;
    }

    .info-card {
        padding: 16px;
    }

    .info-title {
        font-size: 17px;
        margin-bottom: 12px;
        padding-bottom: 10px;
        padding-left: 8px;
        padding-right: 8px;
    }

    .info-title::before {
        width: 8px;
        height: 8px;
        margin-right: 8px;
    }

    .info-content {
        gap: 12px;
    }

    .info-item,
    .step-item,
    .tech-item,
    .faq-item {
        padding: 12px;
    }

    .info-item h3,
    .step-item h3,
    .tech-item h3,
    .faq-item h3 {
        font-size: 14px;
        margin-bottom: 6px;
    }

    .info-item p,
    .step-item p,
    .tech-item p,
    .faq-item p {
        font-size: 12px;
    }

    .tips-box {
        padding: 14px;
    }

    .tips-box h3 {
        font-size: 14px;
        margin-bottom: 10px;
    }

    .tips-box li {
        font-size: 12px;
    }
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .main-container {
        flex-direction: column;
        gap: 12px;
    }

    .control-panel {
        width: 100%;
        max-height: none;
        overflow: visible;
    }
}

@media (max-width: 768px) {
    .main-title {
        font-size: 28px;
        gap: 8px;
    }

    .logo-icon {
        font-size: 26px;
    }

    .subtitle {
        font-size: 14px;
        padding-left: 34px;
        max-width: 100%;
    }

    .header {
        margin-bottom: 32px;
    }

    .button-group {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }

    .footer-content {
        flex-direction: column;
        gap: 6px;
        text-align: center;
    }

    .control-panel {
        padding: 10px;
    }

    .preview-area {
        padding: 10px;
    }
}

/* 隐藏的SEO内容 */
.seo-hidden-content {
    position: absolute;
    top: -9999px;
    left: -9999px;
    width: 1px;
    height: 1px;
    overflow: hidden;
    visibility: hidden;
}

.preview-rotation-toolbar {
    margin: 4px 0;
    padding: 6px 10px;
    background-color: var(--bg-primary);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    flex-shrink: 0;
}

.preview-rotation-toolbar .control-group {
    margin: 0;
    padding: 0;
    border-bottom: none;
}

.preview-rotation-toolbar .control-label {
    font-size: 12px;
    margin-bottom: 4px;
    color: var(--text-secondary);
}

.preview-rotation-toolbar .range-container {
    gap: 8px;
}

.preview-rotation-toolbar .range-input {
    height: 4px;
}

.preview-rotation-toolbar .range-value {
    min-width: 36px;
    font-size: 13px;
    padding: 1px 4px;
}

.preview-rotation-toolbar .rotation-buttons {
    display: flex;
    gap: 8px;
    margin-top: 6px;
}

.preview-rotation-toolbar .rotation-buttons .btn {
    font-size: 12px;
    padding: 5px 8px;
    min-width: auto;
}

/* 水印模式切换按钮 */
.watermark-mode-tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 12px;
}

.watermark-mode-tab {
    flex: 1;
    padding: 8px 12px;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
    font-size: 13px;
    font-weight: 500;
    text-align: center;
    color: var(--text-secondary);
}

.watermark-mode-tab:hover {
    background-color: var(--border-color);
}

.watermark-mode-tab.active {
    background-color: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
}

/* 快捷修改文字面板 */
.presets-panel {
    max-height: 200px;
    overflow-y: auto;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 8px;
    background-color: var(--bg-primary);
    margin-bottom: 12px;
}

.presets-panel::-webkit-scrollbar {
    width: 6px;
}

.presets-panel::-webkit-scrollbar-track {
    background: var(--bg-tertiary);
    border-radius: 3px;
}

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

.presets-panel::-webkit-scrollbar-thumb:hover {
    background: var(--accent-color);
}

.presets-category {
    margin-bottom: 12px;
}

.presets-category:last-child {
    margin-bottom: 0;
}

.presets-category-title {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 6px;
    padding: 4px 8px;
    background-color: var(--bg-tertiary);
    border-radius: var(--radius-sm);
}

.presets-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 6px;
}

.preset-item {
    padding: 8px 10px;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
    font-size: 12px;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 6px;
}

.preset-item:hover {
    background-color: var(--accent-light);
    border-color: var(--accent-color);
    transform: translateY(-1px);
    box-shadow: var(--card-shadow);
}

.preset-item-icon {
    font-size: 16px;
}

.preset-item-name {
    flex: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}