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

        body {
            font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;
            background: #F7F9FC;
            color: #1A2C3E;
        }

        .header {
            background: rgba(247, 249, 252, 0.96);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid #E2E8F0;
            position: sticky;
            top: 0;
            z-index: 50;
        }

        .nav-container {
            max-width: 1300px;
            margin: 0 auto;
            padding: 1rem 2rem;
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
        }

        .logo {
            font-size: 1.8rem;
            font-weight: 800;
            letter-spacing: -0.02em;
            color: #1E3A5F;
        }

        .nav-links {
            display: flex;
            gap: 2rem;
        }

        .nav-links a {
            text-decoration: none;
            font-weight: 500;
            color: #4A5A6E;
            transition: 0.2s;
        }

        .nav-links a.active, .nav-links a:hover {
            color: #E86A4F;
        }

        .faq-layout {
            max-width: 1300px;
            margin: 2rem auto 4rem;
            padding: 0 2rem;
            display: flex;
            flex-wrap: wrap;
            gap: 2.5rem;
        }

        .faq-sidebar {
            flex: 1;
            min-width: 220px;
        }

        .faq-sidebar h3 {
            font-size: 1rem;
            text-transform: uppercase;
            letter-spacing: 1px;
            color: #8D9AAA;
            margin-bottom: 1rem;
        }

        .category-list {
            list-style: none;
        }

        .category-list li {
            padding: 0.7rem 1rem;
            margin-bottom: 0.3rem;
            border-radius: 0.8rem;
            cursor: pointer;
            font-weight: 500;
            color: #4A5A6E;
            transition: all 0.2s;
        }

        .category-list li:hover {
            background: #EDF2F7;
        }

        .category-list li.active-cat {
            background: #E86A4F;
            color: white;
        }

        .faq-main {
            flex: 3;
            background: white;
            border-radius: 1.5rem;
            padding: 1.8rem;
            border: 1px solid #E2E8F0;
            box-shadow: 0 4px 12px rgba(0,0,0,0.02);
        }

        .search-bar {
            margin-bottom: 2rem;
        }

        .search-bar input {
            width: 100%;
            padding: 0.9rem 1.2rem;
            border-radius: 60px;
            border: 1px solid #E2E8F0;
            font-size: 0.95rem;
            background: #FEFEFE;
            outline: none;
            transition: 0.2s;
        }

        .search-bar input:focus {
            border-color: #E86A4F;
        }

        .faq-section-title {
            font-size: 1.4rem;
            font-weight: 700;
            color: #1E3A5F;
            margin-bottom: 1.2rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid #F0F4F9;
        }

        .faq-accordion-item {
            border-bottom: 1px solid #EDF2F7;
        }

        .faq-question {
            padding: 1rem 0;
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
            font-weight: 600;
            color: #1A2C3E;
        }

        .faq-question:hover {
            color: #E86A4F;
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease;
            color: #5A6E7F;
            line-height: 1.6;
        }

        .faq-answer.open {
            max-height: 300px;
            padding-bottom: 1rem;
        }

        .indicator {
            font-size: 1.2rem;
            color: #8D9AAA;
        }

        .hot-topics {
            display: flex;
            flex-wrap: wrap;
            gap: 0.6rem;
            margin-top: 1.5rem;
        }

        .hot-tag {
            background: #F0F4F9;
            padding: 0.3rem 1rem;
            border-radius: 40px;
            font-size: 0.8rem;
            cursor: pointer;
            transition: 0.2s;
        }

        .hot-tag:hover {
            background: #E86A4F20;
            color: #E86A4F;
        }

        .contact-box {
            margin-top: 2rem;
            background: #F8FAFE;
            border-radius: 1rem;
            padding: 1.2rem;
            text-align: center;
        }

        .footer {
            background: #F7F9FC;
            border-top: 1px solid #E2E8F0;
            margin-top: 2rem;
        }

        .footer-container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 3rem 2rem 2rem;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
        }

        .footer-col a {
            display: block;
            color: #6B7A8A;
            text-decoration: none;
            margin-bottom: 0.5rem;
            font-size: 0.9rem;
        }

        .footer-col a:hover {
            color: #E86A4F;
        }

        .copyright {
            text-align: center;
            padding: 1.5rem;
            font-size: 0.8rem;
            color: #8D9AAA;
            border-top: 1px solid #E2E8F0;
        }

        @media (max-width: 800px) {
            .faq-layout { flex-direction: column; }
        }