/* --- START: 全局主题颜色定义 (深海蓝/青色主题) --- */
        :root {
            --color-primary: #1f7a8c; /* 主品牌色：Teal Blue/深海青 */
            --color-secondary: #212121; /* 页脚背景色 */
            --color-accent: #ef4444; /* 行动按钮（下载）色 */
            --color-text-dark: #1f2937;
            --color-text-light: #6b7280;
        }
        /* --- END: 全局主题颜色定义 --- */
        
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
            background-color: #f8f8f8;
            margin: 0;
            padding: 0;
            display: flex;
            flex-direction: column;
            min-height: 10vh;
            padding-top: 3.5rem;
        }
        
        main.content-wrapper {
            max-width: 42rem;
            margin-left: auto;
            margin-right: auto;
            padding: 1rem;
            flex-grow: 1;
            background-color: #ffffff;
            border-radius: 0.75rem;
            box-shadow: 0 0 10px rgba(0, 0, 0, 0.05);
            margin-top: 1rem;
        }

        @media (min-width: 640px) {
            main.content-wrapper {
                padding: 2rem;
                margin-top: 2rem;
            }
        }

        header.header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            background-color: var(--color-primary); /* 使用主品牌色 */
            color: #fff;
            box-shadow: 0 0 8px rgba(31, 122, 140, 0.5); /* 匹配新的主色调 */
            z-index: 1000;
        }

        .nav-container {
            max-width: 45rem;
            margin: 0 auto;
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 0.75rem 1rem;
        }

        .logo {
            font-size: 1.25rem;
            font-weight: 800;
            color: #fff;
            text-decoration: none;
            letter-spacing: 0.5px;
        }

        nav.main-nav {
            display: flex;
            gap: 1.5rem;
        }

        .nav-link {
            color: #fff;
            text-decoration: none;
            font-weight: 500;
            padding: 0.25rem 0;
            transition: color 0.2s;
        }

        .nav-link:hover {
            color: #fff;
            border-bottom: 2px solid #fff;
        }

        @media (max-width: 639px) {
            nav.main-nav {
                display: none;
            }
            .nav-container {
                justify-content: center;
            }
        }


        .intro-header-block {
            display: flex;
            align-items: flex-start;
            background-color: #ffffff;
            border: 1px solid #e5e7eb;
            border-radius: 0.75rem;
            padding: 1rem;
            margin-bottom: 1.5rem;
            box-shadow: 0 1px 2px 0 rgb(0 0 0 / 0.05);
        }

        .cover-image-container {
            margin: 0 1.5rem 0 0;
            overflow: hidden;
            border-radius: 0.5rem;
            box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
            flex-shrink: 0;
            width: 200px;
            height: 140px;
        }

        .cover-image-container img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        
        .intro-text-container {
            padding: 0;
            border: none;
            background: none;
            margin: 0;
            flex-grow: 1;
        }

        .intro-title-right {
            font-size: 1.15rem;
            font-weight: 700;
            color: var(--color-primary); /* 使用主品牌色 */
            margin-top: 0;
            margin-bottom: 0.5rem;
            line-height: 1.2;
        }

        .update-date {
            font-size: 0.8rem;
            font-weight: 500;
            color: var(--color-text-light);
            margin-top: 0.25rem;
            margin-bottom: 0.5rem; 
            text-align: left; 
        }

        @media (max-width: 639px) {
            .intro-header-block {
                flex-direction: column;
                padding: 1rem;
            }
            
            .cover-image-container {
                width: 100%;
                height: 200px;
                margin: 0 0 1rem 0;
            }
            
            .intro-title-right {
                text-align: center;
            }
            
            .update-date {
                text-align: center; 
            }
        }
        
        .description {
            font-size: 14px;
            text-align: left;
            color: #4b5563;
            line-height: 1.625;
            margin: 0;
        }

        .rank-list {
            display: flex;
            flex-direction: column;
            gap: 1rem;
        }
        
        /* ------------------- START: UPDATED LIGHT CARD STYLES ------------------- */
        .rank-item {
            background-color: #ffffff; 
            color: var(--color-text-dark); 
            padding: 1.5rem;
            border-radius: 0.75rem;
            display: flex;
            align-items: flex-start;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05); 
            flex-direction: column; 
            border: 1px solid #e5e7eb; 
        }
        
        .rank-top-row {
            display: flex;
            align-items: center;
            width: 100%;
            margin-bottom: 1rem;
        }

        /* App Logo (Icon) */
        .app-logo {
            flex-shrink: 0;
            width: 3.5rem;
            height: 3.5rem;
            border-radius: 0.75rem; 
            overflow: hidden;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-right: 1rem;
            box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
        }

        .app-logo img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        /* App Info Header (Title, Subtitle) */
        .app-info-header {
            flex-grow: 1;
            display: flex;
            flex-direction: column;
            justify-content: center;
            margin-right: 1rem;
        }

        .app-title-group {
            display: flex;
            align-items: center;
            margin-bottom: 0.25rem;
        }
        
        .app-name {
            font-size: 1.3rem;
            font-weight: 700;
            color: var(--color-text-dark); 
            margin: 0;
        }
        
        .app-subtitle {
            font-size: 0.9rem;
            color: var(--color-text-light); 
            margin: 0;
        }
        
        /* Detailed Description (Below top row) */
        .detailed-description {
            font-size: 0.9rem;
            line-height: 1.7;
            color: #374151;
            margin-top: 0.5rem;
            padding-top: 1rem;
            width: 100%; 
            border-top: 1px solid #e5e7eb; 
            text-align: justify;
        }

        .download-btn {
            flex-shrink: 0;
            margin-left: auto;
            background-color: var(--color-accent); /* 使用行动按钮色 */
            color: #fff;
            font-weight: 700;
            padding: 0.6rem 1.2rem; 
            border-radius: 0.5rem;
            transition-property: background-color;
            transition-duration: 200ms;
            text-decoration: none;
            font-size: 1rem;
        }

        .download-btn:hover {
            background-color: #b91c1c; 
        }
        /* ------------------- END: UPDATED LIGHT CARD STYLES ------------------- */


        /* ------------------- START: RANK NUMBER DESIGN ------------------- */
        .rank-number-badge {
            flex-shrink: 0; 
            width: 2.2rem;
            height: 2.2rem;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 800;
            font-size: 1.15rem;
            color: #fff;
            margin-right: 1.5rem; 
            border-radius: 0.5rem; 
            box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
        }

        /* 1st Place - Gold (Circle + Scale effect) */
        .rank-gold {
            background: linear-gradient(135deg, #FFD700 0%, #FFA500 100%);
            box-shadow: 0 4px 8px rgba(255, 215, 0, 0.5);
            border: 2px solid #FFEB3B;
            transform: scale(1.05); 
            border-radius: 50%;
        }

        /* 2nd Place - Silver */
        .rank-silver {
            background: linear-gradient(135deg, #C0C0C0 0%, #A9A9A9 100%);
            box-shadow: 0 4px 6px rgba(192, 192, 192, 0.4);
            border: 2px solid #E0E0E0;
            font-size: 1.1rem;
        }

        /* 3rd Place - Bronze */
        .rank-bronze {
            background: linear-gradient(135deg, #CD7F32 0%, #A0522D 100%);
            box-shadow: 0 4px 6px rgba(205, 127, 50, 0.4);
            border: 2px solid #F4A460;
            font-size: 1.1rem;
        }

        /* 4th-10th Place - Default Primary Color */
        .rank-default {
            background-color: var(--color-primary); /* 使用主品牌色 */
            color: #fff;
            border: 1px solid #104d58;
            font-weight: 700;
            font-size: 1rem;
        }
        /* ------------------- END: RANK NUMBER DESIGN ------------------- */

        @media (max-width: 639px) {
            .rank-item {
                padding: 1rem;
            }
            
            .rank-top-row {
                margin-bottom: 0.75rem;
            }

            .rank-number-badge {
                width: 1.75rem;
                height: 1.75rem;
                font-size: 1rem;
                margin-right: 0.75rem;
                transform: scale(1) !important; 
            }

            .app-logo {
                width: 3rem;
                height: 3rem;
                margin-right: 0.75rem;
            }

            .app-info-header .app-name {
                font-size: 1.1rem;
            }
            
            .app-subtitle {
                 font-size: 0.8rem;
            }
            
            .download-btn {
                padding: 0.4rem 0.8rem;
                font-size: 0.8rem;
            }
            
            .detailed-description {
                font-size: 0.85rem;
                padding-top: 0.75rem;
            }
        }

        .section-container {
            margin-top: 2rem;
            padding: 1.5rem;
            background-color: #ffffff;
            border-radius: 0.75rem;
            border: 1px solid #e5e7eb;
            box-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.05), 0 2px 4px -2px rgb(0 0 0 / 0.03);
        }

        h2.section-title {
            font-size: 1.25rem;
            font-weight: 700;
            text-align: center;
            color: var(--color-text-dark);
            margin-bottom: 1.5rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid var(--color-primary); /* 使用主品牌色 */
        }

        .summary-content {
            font-size: 1rem;
            line-height: 1.75;
            color: #374151;
            text-align: justify;
        }

        .faq-item {
            margin-bottom: 1.25rem;
            padding-bottom: 1rem;
            border-bottom: 1px dashed #e5e7eb;
        }

        .faq-item:last-child {
            border-bottom: none;
            margin-bottom: 0;
            padding-bottom: 0;
        }
        
        h3.faq-question {
            font-size: 1rem;
            font-weight: 600;
            color: var(--color-primary); /* 使用主品牌色 */
            margin-top: 0;
            margin-bottom: 0.5rem;
            padding-left: 1.5rem;
            position: relative;
        }

        h3.faq-question::before {
            content: "Q";
            position: absolute;
            left: 0;
            top: 0;
            font-weight: 800;
            color: #f08a00; /* 强调色 */
        }

        .faq-answer {
            font-size: 0.95rem;
            color: #4b5563;
            line-height: 1.6;
            padding-left: 1.5rem;
            position: relative;
        }

        .faq-answer::before {
            content: "A";
            position: absolute;
            left: 0;
            top: 0;
            font-weight: 800;
            color: #4CAF50; /* 绿色 */
        }
        
        /* 移除 FAQ 更多链接样式 */
        .faq-more-link { display: none; }


        .related-list {
            display: flex;
            flex-wrap: wrap;
            gap: 0.75rem;
            list-style: none;
            padding: 0;
            margin: 0 auto;
            justify-content: center;
            max-width: 38rem;
        }

        .related-list li {
            background-color: #e6f9ff; /* 浅青色背景 */
            border: 1px solid #b3e6ff;
            border-radius: 0.5rem;
            padding: 0.5rem 1rem;
            transition: background-color 0.2s;
            text-align: center;
            width: calc(50% - 0.375rem); 
            box-sizing: border-box;
        }

        .related-list li:hover {
            background-color: var(--color-primary); /* 悬停变为主品牌色 */
        }
        
        .related-list li:hover a {
             color: #fff;
        }


        .related-list a {
            color: var(--color-primary); /* 使用主品牌色 */
            text-decoration: none;
            font-weight: 500;
            font-size: 0.9rem;
        }
        
        @media (max-width: 639px) {
            .related-list li {
                width: 100%;
            }
        }

        /* ------------------- START: NEW FOOTER STYLES ------------------- */
        footer.footer {
            background-color: var(--color-secondary); /* 深色背景 */
            color: #ccc;
            padding: 3rem 1rem 1rem;
            margin-top: 3rem;
            border-top: 5px solid var(--color-primary); /* 主题色顶部条 */
        }

        .footer-content {
            max-width: 72rem; /* 匹配提供的代码中的 max-w-7xl */
            margin: 0 auto 2rem;
            display: grid;
            grid-template-columns: repeat(2, 1fr); /* 移动端两栏 */
            gap: 2rem;
            padding-bottom: 2rem;
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        }
        
        @media (min-width: 768px) { /* 768px 以上变为五栏 */
            .footer-content {
                grid-template-columns: repeat(5, 1fr);
                gap: 1.5rem;
            }
            .footer-column-qr {
                text-align: center;
            }
        }
        
        .footer-column h4 {
            font-size: 1rem;
            font-weight: 600;
            color: #fff;
            margin-bottom: 1rem;
        }

        .footer-column ul {
            list-style: none;
            padding: 0;
            margin: 0;
            line-height: 1.8;
        }

        .footer-link-item {
            color: #999;
            text-decoration: none;
            font-size: 0.85rem;
            transition: color 0.2s;
        }

        .footer-link-item:hover {
            color: var(--color-primary); /* 悬停使用主色调 */
        }
        
        .footer-bottom {
            max-width: 72rem;
            margin: 0 auto;
            text-align: center;
        }
        
        .footer-bottom-links a {
            color: #ccc;
            margin: 0 0.75rem;
            font-size: 0.85rem;
            text-decoration: none;
        }
        
        .footer-bottom-links a:hover {
            color: var(--color-primary);
        }

        .copyright-text {
            font-size: 0.75rem;
            color: #777;
            margin-top: 0.75rem;
            line-height: 1.6;
        }
        /* ------------------- END: NEW FOOTER STYLES ------------------- */