/* CSS变量 - 统一设计系统 */
:root {
    --primary-bg: #f8f9fa;
    --primary-text: #2c3e50;
    --secondary-text: #7f8c8d;
    --accent-color: #3498db;
    --accent-light: rgba(52, 152, 219, 0.1);
    --accent-hover: #2980b9;
    --glass-bg: rgba(255, 255, 255, 0.92);
    --glass-border: rgba(255, 255, 255, 0.4);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
    --glass-highlight: rgba(255, 255, 255, 0.6);
    
    /* 统一动画曲线 */
    --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);
    --ease-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);
    --ease-out: cubic-bezier(0, 0, 0.2, 1);
    --ease-in: cubic-bezier(0.4, 0, 1, 1);
    
    /* 统一动画时长 */
    --duration-fast: 150ms;
    --duration-normal: 250ms;
    --duration-slow: 350ms;
    
    /* 统一圆角 */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --radius-2xl: 24px;
    --radius-full: 9999px;
    
    /* 性能优化 */
    --backdrop-blur: blur(20px) saturate(180%);
    --scrollbar-width: 8px;
}

/* 重置和基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Helvetica, Arial, sans-serif;
    background: linear-gradient(135deg, #f5f7fa 0%, #e4edf5 100%);
    color: var(--primary-text);
    overflow: hidden;
    height: 100vh;
    display: flex;
    flex-direction: column;
    will-change: auto;
}

/* 玻璃态设计 - 统一圆角 */
.glass {
    background: var(--glass-bg);
    backdrop-filter: var(--backdrop-blur);
    -webkit-backdrop-filter: var(--backdrop-blur);
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
    border-radius: var(--radius-lg);
    transition: all var(--duration-normal) var(--ease-smooth);
    will-change: transform, opacity, box-shadow;
    transform: translateZ(0);
}

.glass-disabled {
    opacity: 0.5;
    pointer-events: none;
}

.glass:hover:not(.glass-disabled):not(.settings-panel):not(.chapters-panel) {
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.12);
}

/* 应用主体 */
.app-container {
    display: flex;
    flex: 1;
    overflow: hidden;
    padding: 20px;
    gap: 20px;
    position: relative;
}

/* 阅读区域优化 */
.reading-area {
    flex: 1;
    position: relative;
    overflow: hidden;
    border-radius: var(--radius-xl);
}

.content-container {
    height: 100%;
    overflow-y: auto;
    padding: 60px clamp(40px, 5vw, 100px);
    scroll-behavior: smooth;
    scrollbar-width: thin;
    scrollbar-color: rgba(0, 0, 0, 0.2) transparent;
    position: relative;
    -webkit-overflow-scrolling: touch;
}

.content-container::-webkit-scrollbar {
    width: var(--scrollbar-width);
}

.content-container::-webkit-scrollbar-track {
    background: transparent;
    border-radius: var(--radius-full);
}

.content-container::-webkit-scrollbar-thumb {
    background: rgba(0, 0, 0, 0.2);
    border-radius: var(--radius-full);
    transition: background var(--duration-fast) var(--ease-smooth);
}

.content-container::-webkit-scrollbar-thumb:hover {
    background: rgba(0, 0, 0, 0.3);
}

.content {
    max-width: min(800px, 90vw);
    margin: 0 auto;
    line-height: 1.6;
    font-size: 16px;
    transition: all var(--duration-normal) var(--ease-smooth);
    will-change: font-size, line-height, letter-spacing;
}

/* 段落渐显动画 - 性能优化 */
.content p {
    margin-bottom: 1em;
    transition: all var(--duration-normal);
    opacity: 0;
    transform: translateY(20px);
    will-change: transform, opacity;
}

.content p.fade-in {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.6s var(--ease-smooth), transform 0.6s var(--ease-smooth);
}

/* 角部控制容器 */
.corner-control {
    position: fixed;
    z-index: 100;
    transition: all var(--duration-normal) var(--ease-smooth);
    pointer-events: auto;
    will-change: transform, opacity;
}

.corner-control.top-left {
    top: 40px;
    left: 40px;
}

.corner-control.top-right {
    top: 40px;
    right: 40px;
}

.corner-control.bottom-right {
    bottom: 40px;
    right: 40px;
}

/* 角部按钮 - 统一圆角 */
.corner-btn {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    border: 1px solid var(--glass-border);
    background: var(--glass-bg);
    backdrop-filter: var(--backdrop-blur);
    -webkit-backdrop-filter: var(--backdrop-blur);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--duration-fast) var(--ease-smooth);
    box-shadow: var(--glass-shadow);
}

.corner-btn:hover {
    background: rgba(255, 255, 255, 0.95);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15);
}

.corner-btn:active {
    transform: scale(0.95);
}

.corner-btn svg {
    width: 20px;
    height: 20px;
    stroke: var(--primary-text);
    transition: stroke var(--duration-fast);
}

/* 翻页按钮组 - 统一圆角 */
.page-control-group {
    display: flex;
    align-items: center;
    padding: 0;
    border-radius: var(--radius-full);
    border: 1px solid var(--glass-border);
    background: var(--glass-bg);
    backdrop-filter: var(--backdrop-blur);
    -webkit-backdrop-filter: var(--backdrop-blur);
    box-shadow: var(--glass-shadow);
    overflow: hidden;
    height: 56px;
    width: auto;
    gap: 0;
    will-change: transform;
}

/* 翻页按钮 */
.page-btn {
    padding: 0;
    border: none;
    background: transparent;
    color: var(--accent-color);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-family: inherit;
    font-weight: 500;
    transition: all var(--duration-fast) var(--ease-smooth);
    flex-shrink: 0;
    width: 56px;
    height: 56px;
}

.page-btn:hover:not(.glass-disabled) {
    background: rgba(52, 152, 219, 0.1);
}

.page-btn:active:not(.glass-disabled) {
    transform: scale(0.95);
}

.page-btn.glass-disabled {
    opacity: 0.5;
    pointer-events: none;
}

.page-btn svg {
    width: 24px;
    height: 24px;
    stroke: currentColor;
    transition: stroke var(--duration-fast);
}

/* 章节标题容器 */
.chapter-title-container {
    flex: 1;
    min-width: 0;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 16px;
    position: relative;
    overflow: hidden;
    border-left: 1px solid rgba(0, 0, 0, 0.05);
    border-right: 1px solid rgba(0, 0, 0, 0.05);
}

.chapter-title-wrapper {
    width: 100%;
    overflow: hidden;
    white-space: nowrap;
    position: relative;
    display: flex;
    align-items: center;
}

.chapter-title {
    font-size: 14px;
    font-weight: 500;
    color: var(--primary-text);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 100%;
    transition: transform var(--duration-normal) var(--ease-smooth);
    padding: 0 4px;
    text-align: center;
    will-change: transform;
}

/* 标题滚动动画 */
.chapter-title.scrollable {
    animation: scrollTitle 15s linear infinite;
    animation-play-state: paused;
}

.chapter-title.scrollable:hover {
    animation-play-state: running;
}

@keyframes scrollTitle {
    0% {
        transform: translateX(100%);
    }
    5% {
        transform: translateX(100%);
    }
    95% {
        transform: translateX(-100%);
    }
    100% {
        transform: translateX(-100%);
    }
}

/* 简化的滚动动画 - 只滚动一次 */
.chapter-title.scroll-once {
    animation: scrollTitleOnce 8s var(--ease-smooth) forwards;
}

@keyframes scrollTitleOnce {
    0% {
        transform: translateX(0);
    }
    10% {
        transform: translateX(0);
    }
    90% {
        transform: translateX(calc(-100% + 200px));
    }
    100% {
        transform: translateX(calc(-100% + 200px));
    }
}

/* 智能隐藏效果 */
.corner-control, .page-control-group {
    opacity: 0.9;
    transition: opacity 0.3s var(--ease-smooth);
}

.reading-area:hover .corner-control,
.reading-area:hover .page-control-group,
.corner-control:hover,
.page-control-group:hover {
    opacity: 1;
}

/* 设置面板和章节面板 - 统一圆角 */
.settings-panel, .chapters-panel {
    position: fixed;
    top: 20px;
    left: 20px;
    right: auto;
    width: min(320px, 90vw);
    height: calc(100vh - 40px);
    overflow: hidden;
    z-index: 1000;
    transform: translateX(0) translateZ(0);
    transition: all var(--duration-normal) var(--ease-smooth);
    padding: 20px;
    opacity: 1;
    visibility: visible;
    will-change: transform, opacity;
    transform-origin: left center;
    border: 1px solid var(--glass-border);
    display: flex;
    flex-direction: column;
    border-radius: var(--radius-xl);
}

.settings-panel {
    left: auto;
    right: 20px;
    transform-origin: right center;
}

.settings-panel.collapsed, .chapters-panel.collapsed {
    transform: translateX(calc(100% + 20px)) scale(0.95);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.chapters-panel.collapsed {
    transform: translateX(calc(-100% - 20px)) scale(0.95);
}

/* 面板头部 - 统一圆角 */
.settings-header, .chapters-header {
    padding-bottom: 20px;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    margin-bottom: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-shrink: 0;
}

.settings-title, .chapters-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--primary-text);
    display: flex;
    align-items: center;
    gap: 8px;
}

.settings-title::before, .chapters-title::before {
    content: '';
    width: 4px;
    height: 20px;
    background: var(--accent-color);
    border-radius: var(--radius-sm);
}

.settings-close, .chapters-close {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--duration-fast) var(--ease-smooth);
    background: var(--glass-highlight);
}

.settings-close:hover, .chapters-close:hover {
    background: var(--accent-light);
}

/* 面板内容容器 */
.settings-content, .chapters-list-container {
    flex: 1;
    overflow-y: auto;
    position: relative;
    margin-bottom: 20px;
    padding-right: 8px;
    -webkit-overflow-scrolling: touch;
}

.settings-content::-webkit-scrollbar,
.chapters-list-container::-webkit-scrollbar {
    width: 6px;
}

.settings-content::-webkit-scrollbar-track,
.chapters-list-container::-webkit-scrollbar-track {
    background: transparent;
    border-radius: var(--radius-full);
}

.settings-content::-webkit-scrollbar-thumb,
.chapters-list-container::-webkit-scrollbar-thumb {
    background: rgba(0, 0, 0, 0.15);
    border-radius: var(--radius-full);
    transition: background var(--duration-fast);
}

.settings-content::-webkit-scrollbar-thumb:hover,
.chapters-list-container::-webkit-scrollbar-thumb:hover {
    background: rgba(0, 0, 0, 0.25);
}

/* 章节项 - 统一圆角 */
.chapter-item {
    padding: 14px 18px;
    margin-bottom: 8px;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--duration-fast) var(--ease-smooth);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    position: relative;
    font-weight: 400;
    font-size: 14px;
    color: var(--secondary-text);
    will-change: transform, background-color;
}

.chapter-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 4px;
    height: 0;
    background: var(--accent-color);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    transition: all var(--duration-fast) var(--ease-smooth);
}

.chapter-item:hover {
    background: rgba(0, 0, 0, 0.02);
    color: var(--primary-text);
    padding-left: 22px;
}

.chapter-item:hover::before {
    height: 16px;
}

.chapter-item.active {
    background: var(--accent-light);
    color: var(--accent-color);
    font-weight: 500;
    padding-left: 22px;
    box-shadow: 0 0 0 1px rgba(52, 152, 219, 0.2), var(--glass-shadow);
}

.chapter-item.active::before {
    height: 24px;
    background: var(--accent-color);
}

.chapters-info {
    padding-top: 20px;
    border-top: 1px solid rgba(0, 0, 0, 0.05);
    font-size: 12px;
    color: var(--secondary-text);
    text-align: center;
    flex-shrink: 0;
}

/* 设置区域 */
.settings-section {
    margin-bottom: 24px;
    padding-bottom: 20px;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    transition: all var(--duration-normal);
}

.settings-section:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.section-title {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--primary-text);
    padding-right: 40px;
}

.section-title::before {
    content: '';
    width: 4px;
    height: 16px;
    background: var(--accent-color);
    border-radius: var(--radius-sm);
    flex-shrink: 0;
}

.control-group {
    margin-bottom: 16px;
    transition: all var(--duration-normal);
}

.control-group:last-child {
    margin-bottom: 0;
}

.control-label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
    font-size: 14px;
    color: var(--secondary-text);
}

.control-value {
    font-size: 14px;
    color: var(--accent-color);
    font-weight: 600;
    transition: all var(--duration-fast);
}

/* 滑块 - 统一圆角 */
.slider-container {
    display: flex;
    align-items: center;
    gap: 12px;
}

.slider {
    flex: 1;
    height: 6px;
    border-radius: var(--radius-full);
    background: rgba(0, 0, 0, 0.1);
    outline: none;
    -webkit-appearance: none;
    appearance: none;
    transition: all var(--duration-fast);
}

.slider:hover {
    background: rgba(0, 0, 0, 0.15);
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: var(--radius-full);
    background: white;
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(52, 152, 219, 0.3);
    border: 3px solid var(--accent-color);
    transition: all var(--duration-fast) var(--ease-smooth);
}

.slider::-webkit-slider-thumb:hover {
    box-shadow: 0 4px 12px rgba(52, 152, 219, 0.4);
}

.slider::-webkit-slider-thumb:active {
    transform: scale(0.95);
}

.slider::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: var(--radius-full);
    background: white;
    cursor: pointer;
    border: 3px solid var(--accent-color);
    box-shadow: 0 2px 6px rgba(52, 152, 219, 0.3);
    transition: all var(--duration-fast);
}

/* 按钮 - 统一圆角 */
.btn {
    padding: 12px 20px;
    border-radius: var(--radius-md);
    border: none;
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    cursor: pointer;
    font-family: inherit;
    font-size: 14px;
    font-weight: 500;
    transition: all var(--duration-fast) var(--ease-smooth);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    box-shadow: var(--glass-shadow);
    color: var(--primary-text);
    letter-spacing: -0.2px;
    will-change: transform;
}

.btn:hover:not(.glass-disabled) {
    background: rgba(255, 255, 255, 0.95);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
}

.btn:active:not(.glass-disabled) {
    transform: scale(0.98);
}

.btn-primary {
    background: rgba(52, 152, 219, 0.15);
    color: var(--accent-color);
    box-shadow: 0 6px 20px rgba(52, 152, 219, 0.15);
}

.btn-primary:hover:not(.glass-disabled) {
    background: rgba(52, 152, 219, 0.25);
    box-shadow: 0 12px 32px rgba(52, 152, 219, 0.2);
}

/* 字体上传 */
.font-upload {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.font-upload-input {
    display: none;
}

.font-upload-label {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    cursor: pointer;
    padding: 12px;
    border-radius: var(--radius-md);
    background: rgba(0, 0, 0, 0.03);
    transition: all var(--duration-fast) var(--ease-smooth);
}

.font-upload-label:hover {
    background: rgba(0, 0, 0, 0.08);
}

.font-upload-label:active {
    transform: scale(0.98);
}

/* 字体预览区域 */
.font-preview {
    margin-top: 12px;
    padding: 16px;
    border-radius: var(--radius-md);
    background: rgba(0, 0, 0, 0.02);
    border: 1px dashed rgba(0, 0, 0, 0.1);
    font-size: 14px;
    text-align: center;
    transition: all var(--duration-fast);
}

.font-preview-text {
    font-size: 16px;
    margin-bottom: 8px;
    color: var(--primary-text);
}

.font-preview-name {
    font-size: 12px;
    color: var(--secondary-text);
    margin-top: 4px;
}

/* 文件上传区域 - 统一圆角 */
.file-upload-area {
    padding: 60px 40px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    height: 100%;
    gap: 24px;
    cursor: pointer;
    transition: all var(--duration-normal);
    border-radius: var(--radius-xl);
    background: rgba(255, 255, 255, 0.5);
    margin: 16px;
}

.file-upload-area:hover {
    background: rgba(255, 255, 255, 0.7);
}

.upload-icon {
    font-size: 64px;
    color: rgba(52, 152, 219, 0.5);
    margin-bottom: 16px;
    transition: all var(--duration-normal) var(--ease-smooth);
}

.file-upload-area:hover .upload-icon {
    color: rgba(52, 152, 219, 0.7);
}

/* 存储管理按钮 */
.storage-controls {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid rgba(0, 0, 0, 0.05);
}

.storage-controls .btn {
    flex: 1;
    min-width: calc(50% - 5px);
    font-size: 13px;
    padding: 10px 12px;
}

.storage-info {
    font-size: 12px;
    color: var(--secondary-text);
    margin-top: 10px;
    padding: 8px 12px;
    background: rgba(0, 0, 0, 0.03);
    border-radius: var(--radius-md);
}

/* 加载动画 */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(248, 249, 250, 0.9);
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    opacity: 0;
    visibility: hidden;
    transition: all var(--duration-normal) var(--ease-smooth);
}

.loading-overlay.active {
    opacity: 1;
    visibility: visible;
}

.loading-animation {
    display: flex;
    gap: 12px;
}

.loading-block {
    width: 24px;
    height: 24px;
    background: linear-gradient(135deg, var(--accent-color), #2ecc71);
    border-radius: var(--radius-md);
    animation: loading-wave 1.5s var(--ease-bounce) infinite;
}

.loading-block:nth-child(2) {
    animation-delay: 0.2s;
    background: linear-gradient(135deg, #2ecc71, #e74c3c);
}

.loading-block:nth-child(3) {
    animation-delay: 0.4s;
    background: linear-gradient(135deg, #e74c3c, var(--accent-color));
}

@keyframes loading-wave {
    0%, 100% {
        transform: translateY(0) scale(1);
    }
    25% {
        transform: translateY(-20px) scale(1.1);
    }
    50% {
        transform: translateY(0) scale(0.9);
    }
    75% {
        transform: translateY(10px) scale(1.05);
    }
}

/* 提示条 - 统一圆角 */
.toast {
    position: fixed;
    top: 30px;
    left: 50%;
    transform: translateX(-50%) translateY(-100px);
    padding: 18px 32px;
    border-radius: var(--radius-md);
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    z-index: 2000;
    transition: transform var(--duration-normal) var(--ease-bounce), opacity var(--duration-normal);
    max-width: min(400px, 90vw);
    text-align: center;
    opacity: 0;
    font-weight: 500;
    will-change: transform, opacity;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

.toast.success {
    border-left: 4px solid #27ae60;
}

.toast.error {
    border-left: 4px solid #e74c3c;
}

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

/* 设置面板展开时的遮罩 */
.settings-mask, .chapters-mask {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(2px);
    -webkit-backdrop-filter: blur(2px);
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    transition: all var(--duration-normal) var(--ease-smooth);
}

.settings-mask.active, .chapters-mask.active {
    opacity: 1;
    visibility: visible;
}

/* 滚动触发动画 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-up {
    animation: fadeInUp 0.6s var(--ease-smooth) forwards;
}

/* 性能优化：减少重绘 */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}