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

        body {
            background: #faf7f2;
            font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Noto Sans', sans-serif;
            color: #2a241e;
            line-height: 1.45;
        }

        .container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* 导航 */
        .header {
            background: rgba(255, 248, 240, 0.96);
            backdrop-filter: blur(4px);
            position: sticky;
            top: 0;
            z-index: 100;
            border-bottom: 1px solid #f0e2d4;
        }
        .nav {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 16px 0;
            flex-wrap: wrap;
            gap: 16px;
        }
        .logo a {
            font-size: 1.7rem;
            font-weight: 700;
            background: linear-gradient(135deg, #7a4a28, #c47e5a);
            background-clip: text;
            -webkit-background-clip: text;
            color: transparent;
            text-decoration: none;
            letter-spacing: -0.3px;
        }
        .nav-links {
            display: flex;
            gap: 28px;
        }
        .nav-links a {
            text-decoration: none;
            font-weight: 500;
            color: #5a3e2e;
            transition: 0.2s;
        }
        .nav-links a:hover {
            color: #b45f3b;
            transform: translateY(-1px);
        }

        /* Hero 帮助中心 */
        .hero-help {
            text-align: center;
            padding: 48px 0 32px;
        }
        .hero-help h1 {
            font-size: 2.8rem;
            font-weight: 800;
            background: linear-gradient(145deg, #3f2a1b, #9b5e3c);
            background-clip: text;
            -webkit-background-clip: text;
            color: transparent;
            letter-spacing: -0.5px;
        }
        .hero-help p {
            font-size: 1.2rem;
            color: #6c5340;
            margin-top: 12px;
        }

        /* 快速问题标签（创意速查） */
        .quick-tag-grid {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 14px;
            margin: 24px 0 40px;
        }
        .quick-tag {
            background: #fffcf7;
            border: 1px solid #f0e2d4;
            border-radius: 60px;
            padding: 8px 20px;
            font-weight: 500;
            color: #7a5a44;
            transition: all 0.2s;
            cursor: pointer;
            font-size: 0.9rem;
            box-shadow: 0 1px 2px rgba(0,0,0,0.02);
        }
        .quick-tag:hover {
            background: #f5ede4;
            border-color: #cb9a72;
            transform: translateY(-2px);
        }

        /* 主内容区：创意双栏（左侧分类，右侧问答） */
        .help-layout {
            display: flex;
            flex-wrap: wrap;
            gap: 32px;
            margin: 24px 0 48px;
        }
        .help-sidebar {
            flex: 1.2;
            min-width: 200px;
            background: #ffffffcc;
            backdrop-filter: blur(2px);
            border-radius: 48px;
            padding: 28px 20px;
            height: fit-content;
            border: 1px solid #f3e6dc;
        }
        .help-sidebar h3 {
            font-size: 1.5rem;
            color: #5a3e2a;
            margin-bottom: 20px;
            border-left: 5px solid #cb9a72;
            padding-left: 16px;
        }
        .cat-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .cat-btn {
            background: transparent;
            border: none;
            text-align: left;
            font-size: 1rem;
            font-weight: 500;
            padding: 10px 18px;
            border-radius: 100px;
            cursor: pointer;
            color: #6c5340;
            transition: all 0.2s;
        }
        .cat-btn.active {
            background: #e9d9cc;
            color: #8b5a3a;
            font-weight: 600;
        }
        .cat-btn:hover:not(.active) {
            background: #f2e6dc;
        }

        .help-main {
            flex: 3;
            min-width: 260px;
        }
        /* 手风琴问答卡片 */
        .faq-item {
            background: #ffffffdb;
            backdrop-filter: blur(2px);
            border-radius: 36px;
            margin-bottom: 18px;
            border: 1px solid #f0e2d4;
            overflow: hidden;
            transition: 0.1s;
        }
        .faq-question {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 20px 28px;
            font-weight: 700;
            font-size: 1.08rem;
            color: #4f3420;
            cursor: pointer;
            background: #ffffffcc;
        }
        .faq-question span:first-child {
            flex: 1;
            padding-right: 16px;
        }
        .faq-question .arrow {
            transition: transform 0.2s;
            font-size: 1.2rem;
            color: #b68b62;
        }
        .faq-answer {
            padding: 0 28px 0 28px;
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease, padding 0.2s;
            background: #fefcf9;
            border-top: 1px solid #f3e6dc;
            color: #68523e;
            line-height: 1.5;
        }
        .faq-answer.show {
            max-height: 500px;
            padding: 20px 28px 24px 28px;
        }
        .faq-answer code {
            background: #efe2d6;
            padding: 2px 8px;
            border-radius: 20px;
            font-family: monospace;
            font-size: 0.85rem;
        }

        /* 创意小贴士卡片 */
        .pro-tip {
            background: #f5ede4;
            border-radius: 32px;
            padding: 24px;
            margin: 40px 0 28px;
            border-left: 6px solid #cb9a72;
        }
        .pro-tip h4 {
            font-size: 1.3rem;
            color: #7a4a28;
            margin-bottom: 12px;
        }

        /* 下载区 CTA */
        .cta-download {
            background: #efe2d6;
            border-radius: 56px;
            padding: 36px 28px;
            text-align: center;
            margin: 32px 0 48px;
        }
        .btn-download {
            background: #f7bc7a;
            border: none;
            padding: 12px 32px;
            font-size: 1.1rem;
            font-weight: 700;
            border-radius: 60px;
            color: #2b1c10;
            display: inline-block;
            text-decoration: none;
            transition: 0.2s;
            margin-top: 14px;
        }
        .btn-download:hover {
            background: #ffcf97;
            transform: scale(1.02);
        }

        /* 页脚 */
        .footer {
            background: #efe2d6;
            padding: 36px 0 28px;
            margin-top: 20px;
            text-align: center;
            border-top: 1px solid #e2cfbf;
        }
        .footer-links {
            display: flex;
            justify-content: center;
            gap: 32px;
            margin-bottom: 20px;
            flex-wrap: wrap;
        }
        .footer-links a {
            text-decoration: none;
            color: #6e4c32;
            font-weight: 500;
        }
        .footer p {
            color: #755c46;
        }

        @media (max-width: 760px) {
            .container {
                padding: 0 20px;
            }
            .hero-help h1 {
                font-size: 2rem;
            }
            .faq-question {
                padding: 16px 20px;
                font-size: 0.95rem;
            }
        }