:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #64748b;
    --light-bg: #f8fafc;
    --dark-bg: #1e293b;
    --text-color: #334155;
    --text-light: #94a3b8;
    --border-color: #e2e8f0;
    --success-color: #10b981;
    --error-color: #ef4444;
    --card-bg: #ffffff;
    --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);

    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 0.75rem;  /* 减小了基础间距 */
    --spacing-lg: 1.25rem;  /* 减小了大间距 */
    --spacing-xl: 1.75rem;  /* 减小了超大间距 */

    --radius-sm: 0.25rem;
    --radius-md: 0.375rem;
    --radius-lg: 0.5rem;
    --radius-full: 9999px;
    
    --transition-speed: 0.3s;
}

.dark-mode {
    --text-color: #e2e8f0;
    --text-light: #94a3b8;
    --border-color: #334155;
    --card-bg: #1e293b;
    --light-bg: #0f172a;
    --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -1px rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--light-bg);
    color: var(--text-color);
    line-height: 1.6;
    transition: background-color var(--transition-speed), color var(--transition-speed);
}

/* 调整整体间距，让页面更紧凑 */
.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: var(--spacing-md);
}

/* 减小各部分之间的间距 */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
}

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

h1 span {
    font-weight: 400;
    font-size: 1.25rem;
    color: var(--text-color);
}

/* Theme Toggle */
.theme-toggle {
    position: relative;
}

.toggle-label {
    display: block;
    width: 50px;
    height: 26px;
    background-color: var(--secondary-color);
    border-radius: var(--radius-full);
    cursor: pointer;
    position: relative;
    transition: background-color var(--transition-speed);
}

.toggle-icon {
    position: absolute;
    top: 3px;
    left: 3px;
    width: 20px;
    height: 20px;
    background-color: white;
    border-radius: 50%;
    transition: transform var(--transition-speed);
}

#darkModeToggle {
    opacity: 0;
    width: 0;
    height: 0;
}

#darkModeToggle:checked + .toggle-label {
    background-color: var(--primary-color);
}

#darkModeToggle:checked + .toggle-label .toggle-icon {
    transform: translateX(24px);
}

/* Button Styles */
.btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-md);
    font-weight: 500;
    cursor: pointer;
    transition: background-color var(--transition-speed), transform 0.1s;
    border: none;
    outline: none;
}

.btn:active {
    transform: scale(0.98);
}

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

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

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

.secondary-btn:hover {
    background-color: #d1d5db;
}

/* Upload Area Styles */
.upload-area {
    margin-bottom: var(--spacing-lg);
}

.drop-zone {
    background-color: var(--card-bg);
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    text-align: center;
    transition: border-color var(--transition-speed);
    box-shadow: var(--card-shadow);
    min-height: 250px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.drop-zone.active {
    border-color: var(--primary-color);
    background-color: rgba(37, 99, 235, 0.05);
}

.drop-zone-prompt {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
}

.icon-wrapper {
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

.main-text {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.sub-text {
    color: var(--text-light);
    margin-bottom: var(--spacing-md);
}

.original-preview-container {
    width: 100%;
    max-width: 500px;
    margin: 0 auto;
}

#originalPreview {
    max-height: 400px;
    max-width: 100%;
    object-fit: contain;
    margin-bottom: var(--spacing-md);
    border-radius: var(--radius-md);
}

.image-info {
    background-color: var(--light-bg);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    text-align: left;
}

/* Compression Panel */
.compression-panel {
    background-color: var(--card-bg);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--card-shadow);
    margin-bottom: var(--spacing-lg);
}

.control-group {
    margin-bottom: var(--spacing-md);
}

.control-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
}

.control-header h3 {
    margin-right: var(--spacing-md);
    white-space: nowrap;
}

h3 {
    font-size: 1.1rem;
    font-weight: 600;
}

.size-display, .dimension-display {
    color: var(--text-light);
    font-size: 0.9rem;
}

.size-display span, .dimension-display span {
    color: var(--primary-color);
    font-weight: 600;
}

.dimension-display {
    margin-left: var(--spacing-md);
    white-space: nowrap;
    font-size: 0.85rem;
}

.slider-container {
    position: relative;
    padding: var(--spacing-md) 0;
}

input[type="range"] {
    width: 100%;
    height: 6px;
    -webkit-appearance: none;
    appearance: none;
    background: var(--border-color);
    outline: none;
    border-radius: var(--radius-full);
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    transition: background var(--transition-speed);
}

input[type="range"]::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    transition: background var(--transition-speed);
    border: none;
}

input[type="range"]:hover::-webkit-slider-thumb {
    background: var(--primary-hover);
}

input[type="range"]:hover::-moz-range-thumb {
    background: var(--primary-hover);
}

.slider-value {
    position: absolute;
    top: -5px;
    color: var(--text-color);
    font-size: 0.9rem;
    font-weight: 600;
    transform: translateX(-50%);
}

/* Toggle Switch */
.toggle-switch {
    position: relative;
    display: inline-block;
    width: 50px;
    height: 26px;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-switch label {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--border-color);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: background-color var(--transition-speed);
}

.toggle-switch label:before {
    position: absolute;
    content: "";
    height: 20px;
    width: 20px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    border-radius: 50%;
    transition: transform var(--transition-speed);
}

.toggle-switch input:checked + label {
    background-color: var(--primary-color);
}

.toggle-switch input:checked + label:before {
    transform: translateX(24px);
}

/* Progress Container */
.progress-container {
    background-color: var(--card-bg);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--card-shadow);
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

.progress-bar-container {
    height: 8px;
    background-color: var(--border-color);
    border-radius: var(--radius-full);
    margin-bottom: var(--spacing-md);
    overflow: hidden;
}

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

.progress-text {
    color: var(--text-light);
}

/* Preview Container */
.preview-container {
    background-color: var(--card-bg);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);  /* 减小内边距 */
    box-shadow: var(--card-shadow);
    margin-bottom: var(--spacing-lg);  /* 减小底部间距 */
}

.preview-container h3 {
    text-align: center;
    margin-bottom: var(--spacing-md);  /* 减小标题下方间距 */
}

.comparison-slider {
    position: relative;
    height: 400px;
    margin-bottom: var(--spacing-lg);
    overflow: hidden;
    border-radius: var(--radius-md);
}

.before-image, .after-image {
    position: absolute;
    top: 0;
    height: 100%;
    width: 100%;
    overflow: hidden;
}

.before-image {
    left: 0;
}

.after-image {
    right: 0;
    width: 50%;
}

.before-image img, .after-image img {
    position: absolute;
    top: 0;
    left: 0;
    max-height: 100%;
    max-width: 100%;
    object-fit: contain;
}

.slider-handle {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 50%;
    width: 4px;
    background-color: var(--primary-color);
    cursor: ew-resize;
    transform: translateX(-50%);
}

slider-handle:before {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 40px;
    height: 40px;
    background-color: var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

slider-handle:after {
    content: "⟷";
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-size: 1.5rem;
}

.label {
    position: absolute;
    top: 10px;
    padding: var(--spacing-xs) var(--spacing-sm);
    background-color: rgba(0, 0, 0, 0.6);
    color: white;
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
}

.before-image .label {
    left: 10px;
}

.after-image .label {
    right: 10px;
}

/* 压缩信息区块调整 */
.compression-info {
    background-color: var(--light-bg);
    padding: var(--spacing-md);  /* 减小内边距 */
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);  /* 减小底部间距 */
    font-size: 0.9rem;  /* 字体稍微小一点 */
    line-height: 1.5;
}

.action-buttons {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    position: relative;
}

/* 改进按钮提示样式 */
.button-tooltip {
    position: absolute;
    bottom: -35px;
    left: 50%;
    transform: translateX(-50%);
    background-color: rgba(0, 0, 0, 0.8);
    color: white;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: 0.85rem;
    opacity: 0;
    transition: opacity 0.2s;
    pointer-events: none;
    white-space: nowrap;
    z-index: 5;
}

/* 添加上升箭头指示 */
.button-tooltip:before {
    content: "";
    position: absolute;
    top: -6px;
    left: 50%;
    transform: translateX(-50%);
    border-width: 0 6px 6px 6px;
    border-style: solid;
    border-color: transparent transparent rgba(0, 0, 0, 0.8) transparent;
}

/* 悬停立即显示提示 */
#newImageBtn:hover + .button-tooltip {
    opacity: 1;
}

/* Toast Container */
.toast-container {
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 1000;
}

.toast {
    background-color: var(--card-bg);
    color: var(--text-color);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    margin-top: var(--spacing-md);
    display: flex;
    align-items: center;
    min-width: 280px;
    animation: fadeIn 0.3s, fadeOut 0.3s 2.7s forwards;
}

.toast.error {
    border-left: 4px solid var(--error-color);
}

.toast.success {
    border-left: 4px solid var(--success-color);
}

.toast-icon {
    margin-right: var(--spacing-sm);
    font-size: 1.25rem;
}

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

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

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

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

/* Responsive Styles */
@media (max-width: 768px) {
    .container {
        padding: var(--spacing-md);
    }

    header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-md);
    }

    .theme-toggle {
        align-self: flex-end;
    }

    .action-buttons {
        flex-direction: column;
    }

    .comparison-slider {
        height: 300px;
    }
}

@media (max-width: 480px) {
    .comparison-slider {
        height: 250px;
    }
}

/* 压缩预览图片样式 */
.compressed-preview {
    width: 100%;
    max-width: 600px;
    margin: 0 auto var(--spacing-lg);
    text-align: center;
}

#compressedPreview {
    max-width: 100%;
    max-height: 400px;
    object-fit: contain;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
}

#compressedPreview:hover {
    transform: translateY(-5px);
    box-shadow: 0 6px 14px rgba(0, 0, 0, 0.15);
}

/* 新的控制布局样式 */
.dimension-controls {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    flex: 1;
}

.dimension-slider-container {
    display: flex;
    align-items: center;
    flex: 1;
    position: relative;
    margin-left: var(--spacing-sm);
}

.dimension-slider-container input[type="range"] {
    flex: 1;
}