/* ===== 基础变量 ===== */
        :root {
            --primary: #2A5CAA;
            --primary-light: #4A7CC8;
            --primary-dark: #1A3F7A;
            --accent: #FF6B35;
            --text: #333333;
            --text-light: #555555;
            --border: #E0E0E0;
            --shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
            --shadow-hover: 0 12px 40px rgba(42, 92, 170, 0.13);
            --radius: 10px;
            --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
        }

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

        body {
            font-family: 'Roboto', sans-serif;
            background: #ffffff;
            color: var(--text);
            padding: 40px 0;
            line-height: 1.5;
        }

        .container {
            max-width: 860px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== 模块标题 ===== */
        .download-header {
            text-align: center;
            margin-bottom: 40px;
        }

        .download-header h2 {
            font-family: 'Montserrat', sans-serif;
            font-size: 2rem;
            font-weight: 800;
            color: var(--primary-dark);
            letter-spacing: -0.5px;
            position: relative;
            display: inline-block;
        }

        .download-header h2::after {
            content: '';
            display: block;
            width: 64px;
            height: 4px;
            background: var(--primary);
            margin: 12px auto 0;
            border-radius: 4px;
        }

        .download-header .sub {
            font-size: 0.95rem;
            color: var(--text-light);
            margin-top: 8px;
        }

        /* ===== 下载列表 ===== */
        .download-grid {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        /* ===== 卡片样式 ===== */
        .download-card {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            background: #ffffff;
            padding: 14px 20px;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            border: 1px solid rgba(42, 92, 170, 0.06);
            text-decoration: none;
            color: var(--text);
            transition: var(--transition);
            cursor: pointer;
            position: relative;
            overflow: hidden;
        }

        /* 顶部装饰线 */
        .download-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 3px;
            background: linear-gradient(90deg, var(--primary), var(--primary-light));
            opacity: 0;
            transition: opacity 0.3s ease;
        }

        .download-card:hover::before {
            opacity: 1;
        }

        .download-card:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-hover);
            border-color: rgba(42, 92, 170, 0.12);
        }

        /* 点击效果 —— 背景变为主色，所有文字变白 */
        .download-card:active {
            transform: translateY(-1px) scale(0.98);
            background: var(--primary);
            border-color: var(--primary);
            box-shadow: 0 4px 16px rgba(42, 92, 170, 0.25);
            transition-duration: 0.08s;
        }

        .download-card:active .file-name,
        .download-card:active .file-meta,
        .download-card:active .file-meta .tag,
        .download-card:active .download-arrow {
            color: #ffffff;
        }

        .download-card:active .file-meta .tag {
            background: rgba(255, 255, 255, 0.18);
        }

        .download-card:active .download-arrow {
            background: rgba(255, 255, 255, 0.18);
            color: #ffffff;
            border-color: rgba(255, 255, 255, 0.2);
        }

        /* ===== 文件信息 ===== */
        .file-info {
            flex: 1;
            min-width: 0;
            display: flex;
            flex-direction: column;
            gap: 2px;
        }

        .file-name {
            font-size: 0.98rem;
            font-weight: 600;
            color: var(--primary-dark);
            transition: var(--transition);
            line-height: 1.4;
            word-break: break-word;
        }

        .file-meta {
            font-size: 0.78rem;
            color: var(--text-light);
            transition: var(--transition);
            display: flex;
            align-items: center;
            gap: 10px;
            flex-wrap: wrap;
        }

        .file-meta .tag {
            display: inline-block;
            padding: 1px 10px;
            border-radius: 12px;
            font-size: 0.6rem;
            font-weight: 600;
            background: #f0f2f5;
            color: var(--text-light);
            letter-spacing: 0.3px;
            transition: var(--transition);
        }

        .file-meta .tag.recommend {
            background: rgba(255, 107, 53, 0.12);
            color: var(--accent);
        }

        /* ===== 下载箭头 ===== */
        .download-arrow {
            flex-shrink: 0;
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: #f0f2f5;
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.1rem;
            font-weight: 300;
            transition: var(--transition);
            border: 1px solid rgba(42, 92, 170, 0.06);
        }

        .download-card:hover .download-arrow {
            background: var(--primary);
            color: #ffffff;
            transform: translateX(3px);
            box-shadow: 0 4px 12px rgba(42, 92, 170, 0.20);
        }

        /* ===== 底部提示 ===== */
        .download-footer {
            margin-top: 28px;
            text-align: center;
        }

        .download-footer .hint {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 8px 20px;
            background: #f8fafc;
            border-radius: 30px;
            font-size: 0.8rem;
            color: var(--text-light);
            border: 1px solid rgba(42, 92, 170, 0.06);
        }

        .download-footer .hint strong {
            color: var(--primary);
            font-weight: 600;
        }

        /* ===== 响应式 ===== */
        @media (max-width: 640px) {
            .container {
                padding: 0 16px;
            }

            .download-header h2 {
                font-size: 1.6rem;
            }

            .download-card {
                padding: 12px 16px;
                gap: 12px;
                flex-wrap: wrap;
            }

            .file-name {
                font-size: 0.88rem;
            }

            .file-meta {
                font-size: 0.7rem;
                gap: 6px;
            }

            .download-arrow {
                width: 30px;
                height: 30px;
                font-size: 0.9rem;
            }

            .download-footer .hint {
                font-size: 0.7rem;
                padding: 6px 14px;
            }
        }

        @media (max-width: 400px) {
            .download-card {
                padding: 10px 12px;
            }
            .file-name {
                font-size: 0.8rem;
            }
            .file-meta {
                font-size: 0.65rem;
            }
            .download-arrow {
                width: 26px;
                height: 26px;
                font-size: 0.8rem;
            }
        }