/* 全局样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.6;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #333;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    padding-top: 70px; /* 为固定顶部留出空间 */
    padding-bottom: 120px; /* 为固定底部留出空间 */
}

/* 顶部导航栏 */
.header {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    padding: 15px 0;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}

.header .container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 0 20px;
}

.lang-switcher {
    display: flex;
    gap: 10px;
}


.lang-switcher button {
    background: rgba(255, 255, 255, 0.9);
    border: 1px solid rgba(255, 255, 255, 0.3);
    padding: 8px 16px;
    cursor: pointer;
    border-radius: 25px;
    transition: all 0.3s ease;
    color: #333;
    font-weight: 500;
    font-size: 14px;
}

.lang-switcher button:hover {
    background: rgba(255, 255, 255, 1);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.lang-switcher button.active {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-color: transparent;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

/* 主要内容容器 */
.container {
    flex: 1;
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px 20px 40px 20px; /* 调整padding，顶部和底部留更多空间 */
    display: flex;
    flex-direction: column;
    gap: 30px;
}

/* 标题区域 */
.title-section {
    text-align: center;
    background: rgba(255, 255, 255, 0.95);
    padding: 50px 40px;
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.title-section h1 {
    font-size: 3.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 20px;
    letter-spacing: -0.02em;
}

.subtitle {
    font-size: 1.2rem;
    color: #666;
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.8;
}


/* 控制区域 */
.controls {
    background: rgba(255, 255, 255, 0.95);
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    display: flex;
    flex-direction: column;
    gap: 20px;
    align-items: center;
}

/* 文件上传区域 */
.file-upload-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
}

#pdf-upload {
    display: none;
}

.upload-label {
    font-size: 18px;
    font-weight: 600;
    padding: 15px 30px;
    border-radius: 50px;
    border: none;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    cursor: pointer;
    display: inline-block;
    transition: all 0.3s ease;
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.3);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.upload-label:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 35px rgba(102, 126, 234, 0.4);
}

.page-selection-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
    width: 100%;
    max-width: 500px;
}

.page-selection-wrapper label {
    font-size: 16px;
    font-weight: 600;
    color: #333;
}

input[type="text"] {
    width: 100%;
    max-width: 400px;
    font-size: 16px;
    padding: 15px 20px;
    border-radius: 10px;
    border: 2px solid #e0e6ed;
    background: white;
    transition: all 0.3s ease;
    text-align: center;
}

input[type="text"]:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

button {
    font-size: 16px;
    font-weight: 600;
    padding: 12px 24px;
    border-radius: 10px;
    border: none;
    background: linear-gradient(135deg, #ff6b6b, #ee5a24);
    color: white;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 6px 20px rgba(238, 90, 36, 0.3);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

button:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(238, 90, 36, 0.4);
}

#file-list-container {
    background: rgba(255, 255, 255, 0.95);
    padding: 25px;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

#file-list-container h2 {
    margin: 0 0 20px 0;
    font-size: 1.4rem;
    font-weight: 600;
    color: #333;
    text-align: center;
}

#file-list {
    list-style-type: none;
    padding: 0;
    display: grid;
    gap: 12px;
}

#file-list li {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    padding: 15px 20px;
    border-radius: 10px;
    border-left: 4px solid #667eea;
    font-size: 14px;
    color: #495057;
    transition: all 0.3s ease;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

#file-list li:hover {
    transform: translateX(5px);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.preview-group {
    width: 100%;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid #007bff;
}

.preview-group-title {
    width: 100%;
    text-align: left;
    font-size: 1.3em;
    color: #0056b3;
    margin-bottom: 10px;
}

#status {
    background: rgba(255, 255, 255, 0.95);
    padding: 20px;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    font-size: 1.1rem;
    color: #495057;
    text-align: center;
    font-weight: 500;
}

#pdf-preview {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    padding: 30px;
    min-height: 400px;
    max-height: 70vh;
    overflow-y: auto;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 20px;
}

#pdf-preview canvas {
    border-radius: 10px;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
    max-width: 100%;
    height: auto;
    transition: all 0.3s ease;
}

#pdf-preview canvas:hover {
    transform: scale(1.02);
    box-shadow: 0 12px 35px rgba(0, 0, 0, 0.2);
}

.preview-group {
    width: 100%;
    margin-bottom: 30px;
    padding: 20px;
    background: rgba(248, 249, 250, 0.8);
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.preview-group-title {
    margin: 0 0 20px 0;
    font-size: 1.3rem;
    font-weight: 600;
    color: #495057;
    text-align: center;
    padding-bottom: 10px;
    border-bottom: 2px solid #667eea;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        padding: 10px 15px 30px 15px; /* 响应式设计下调整padding */
        gap: 20px;
    }
    
    .title-section {
        padding: 30px 20px;
    }
    
    .title-section h1 {
        font-size: 2.5rem;
    }
    
    .subtitle {
        font-size: 1rem;
    }
    
    .controls {
        padding: 20px;
    }
    
    .page-selection-wrapper {
        max-width: 100%;
    }
    
    .header .container {
        flex-direction: column;
        gap: 10px;
        text-align: center;
    }
    
    .lang-switcher {
        padding: 0 15px;
    }
    
    #pdf-preview {
        padding: 15px;
        gap: 15px;
    }
    
    .preview-group {
        padding: 15px;
        margin-bottom: 20px;
    }
}

@media (max-width: 480px) {
    body {
        padding-top: 75px; /* 小屏幕下适当增加顶部空间 */
        padding-bottom: 140px; /* 小屏幕下适当增加底部空间 */
    }
    
    .title-section h1 {
        font-size: 2rem;
    }
    
    .upload-label {
        font-size: 16px;
        padding: 12px 24px;
    }
    
    input[type="text"] {
        font-size: 14px;
        padding: 12px 16px;
    }
    
    button {
        font-size: 14px;
        padding: 10px 20px;
    }
    
    .stats-container {
        margin-top: 30px;
        padding: 15px;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 15px;
    }
    
    .stat-item {
        padding: 15px;
    }
    
    .stat-number {
        font-size: 1.8rem;
    }
    
    .stats-footer {
        text-align: center;
        font-size: 0.8rem;
    }
}

/* === 访问统计样式 === */
.stats-container {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-radius: 15px;
    padding: 20px;
    margin: 30px auto;
    max-width: 800px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.stats-header {
    text-align: center;
    margin-bottom: 15px;
}

.stats-header h3 {
    font-size: 1.4rem;
    color: #2c3e50;
    font-weight: 600;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 15px;
    margin-bottom: 15px;
}

.stat-item {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 18px 12px;
    border-radius: 12px;
    text-align: center;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.stat-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(102, 126, 234, 0.3);
}

.stat-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.1), transparent);
    transition: left 0.5s;
}

.stat-item:hover::before {
    left: 100%;
}

.stat-number {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 5px;
    display: block;
    text-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.stat-label {
    font-size: 0.75rem;
    opacity: 0.9;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 500;
}

.stats-footer {
    text-align: center;
    padding-top: 15px;
    border-top: 1px solid rgba(0, 0, 0, 0.1);
    color: #666;
    font-size: 0.8rem;
}

.last-updated {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
}

/* 加载动画 */
.loading-dot {
    display: inline-block;
    animation: pulse 1.5s infinite;
    color: rgba(255, 255, 255, 0.7);
}

@keyframes pulse {
    0%, 100% { opacity: 0.4; }
    50% { opacity: 1; }
}

/* 数字计数动画 */
.count-up {
    display: inline-block;
    transition: all 0.3s ease;
}

.count-up:hover {
    transform: scale(1.05);
}

/* 错误状态 */
.error-state {
    color: rgba(255, 255, 255, 0.6);
    font-style: italic;
}

/* 响应式适配 - 访问统计 */
@media (max-width: 768px) {
    .stats-container {
        margin: 20px 15px;
        padding: 15px;
    }
    
    .stats-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 10px;
    }
    
    .stat-item {
        padding: 15px 8px;
    }
    
    .stat-number {
        font-size: 1.5rem;
    }
    
    .stat-label {
        font-size: 0.65rem;
    }
    
    .stats-header h3 {
        font-size: 1.2rem;
    }
}

@media (max-width: 480px) {
    .stats-container {
        margin: 15px 10px;
        padding: 12px;
    }
    
    .stats-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 8px;
    }
    
    .stat-item {
        padding: 12px 6px;
    }
    
    .stat-number {
        font-size: 1.3rem;
    }
    
    .stat-label {
        font-size: 0.6rem;
        letter-spacing: 0.3px;
    }
    
    .stats-header h3 {
        font-size: 1.1rem;
    }
    
    .stats-footer {
        font-size: 0.7rem;
        padding-top: 10px;
    }
}