/* ==================== 全局重置 & 基础 ==================== */
        *,
        *::before,
        *::after {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        :root {
            --bg-deep: #0c0a14;
            --bg-surface: #151128;
            --bg-card: #1a1533;
            --bg-card-hover: #221a42;
            --accent: #00e5c7;
            --accent-2: #7c5cff;
            --accent-glow: rgba(0, 229, 199, 0.25);
            --accent-2-glow: rgba(124, 92, 255, 0.25);
            --text-main: #ffffff;
            --text-secondary: #a89fc4;
            --text-tertiary: #6f6790;
            --border-subtle: rgba(124, 92, 255, 0.15);
            --border-glow: rgba(0, 229, 199, 0.3);
            --shadow-soft: 0 8px 40px rgba(0, 0, 0, 0.25);
            --shadow-glow: 0 0 60px rgba(0, 229, 199, 0.08);
            --shadow-faq: 0 0 40px rgba(124, 92, 255, 0.12);
            --radius: 14px;
            --radius-lg: 20px;
            --radius-full: 50px;
            --transition: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
            --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'PingFang SC', 'Microsoft YaHei', sans-serif;
            --gradient-main: linear-gradient(135deg, #00e5c7 0%, #7c5cff 100%);
            --gradient-card: linear-gradient(160deg, rgba(26, 21, 51, 0.95) 0%, rgba(12, 10, 20, 0.98) 100%);
            --gradient-border: linear-gradient(135deg, rgba(0, 229, 199, 0.4), rgba(124, 92, 255, 0.4));
        }

        html {
            scroll-behavior: smooth;
            scroll-padding-top: 80px;
        }

        body {
            font-family: var(--font);
            color: var(--text-main);
            background: var(--bg-deep);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            overflow-x: hidden;
        }

        a {
            text-decoration: none;
            color: inherit;
            transition: var(--transition);
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ==================== 顶部导航（与首页一致，高亮当前页） ==================== */
        .header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: rgba(12, 10, 20, 0.85);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid var(--border-subtle);
            transition: var(--transition);
        }

        .header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 72px;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 20px;
            font-weight: 800;
            color: var(--text-main);
            letter-spacing: -0.5px;
        }

        .logo-icon {
            width: 38px;
            height: 38px;
            background: var(--gradient-main);
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            color: #0c0a14;
            font-weight: 900;
            box-shadow: 0 0 24px var(--accent-glow);
        }

        .logo span {
            background: var(--gradient-main);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .nav {
            display: flex;
            align-items: center;
            gap: 28px;
        }

        .nav a {
            color: var(--text-secondary);
            font-size: 14px;
            font-weight: 500;
            letter-spacing: 0.2px;
            transition: var(--transition);
            position: relative;
            padding: 4px 0;
        }

        .nav a:hover {
            color: var(--text-main);
        }

        .nav a::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--gradient-main);
            border-radius: 2px;
            transition: var(--transition);
        }

        .nav a:hover::after,
        .nav a.active::after {
            width: 100%;
        }

        .nav a.active {
            color: var(--text-main);
            font-weight: 600;
        }

        .nav .lang-btn {
            background: rgba(255, 255, 255, 0.06);
            padding: 6px 16px;
            border-radius: var(--radius-full);
            font-size: 13px;
            color: var(--text-main);
            border: 1px solid var(--border-subtle);
            transition: var(--transition);
            letter-spacing: 0.3px;
        }

        .nav .lang-btn:hover {
            background: rgba(255, 255, 255, 0.12);
            border-color: var(--border-glow);
            box-shadow: 0 0 20px var(--accent-glow);
        }

        .nav .lang-btn::after {
            display: none;
        }

        .mobile-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            cursor: pointer;
            padding: 4px;
            background: none;
            border: none;
        }

        .mobile-toggle span {
            display: block;
            width: 26px;
            height: 2.5px;
            background: var(--text-main);
            border-radius: 2px;
            transition: var(--transition);
        }

        /* ==================== FAQ Hero ==================== */
        .faq-hero {
            padding: 160px 0 70px;
            background: var(--bg-deep);
            position: relative;
            overflow: hidden;
            min-height: 65vh;
            display: flex;
            align-items: center;
        }

        .faq-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background:
                radial-gradient(ellipse at 30% 50%, rgba(0, 229, 199, 0.08) 0%, transparent 55%),
                radial-gradient(ellipse at 70% 50%, rgba(124, 92, 255, 0.10) 0%, transparent 55%);
            pointer-events: none;
        }

        .faq-hero-grid {
            position: absolute;
            inset: 0;
            opacity: 0.04;
            background-image:
                linear-gradient(rgba(0, 229, 199, 0.4) 1px, transparent 1px),
                linear-gradient(90deg, rgba(124, 92, 255, 0.4) 1px, transparent 1px);
            background-size: 45px 45px;
            pointer-events: none;
            mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
            -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
        }

        .faq-hero .container {
            position: relative;
            z-index: 2;
            text-align: center;
            max-width: 850px;
        }

        .faq-hero-badge {
            display: inline-block;
            background: rgba(124, 92, 255, 0.12);
            color: var(--accent-2);
            font-size: 13px;
            font-weight: 600;
            padding: 5px 18px;
            border-radius: var(--radius-full);
            margin-bottom: 20px;
            border: 1px solid rgba(124, 92, 255, 0.25);
            letter-spacing: 0.4px;
        }

        .faq-hero h1 {
            font-size: 44px;
            font-weight: 800;
            line-height: 1.15;
            margin-bottom: 18px;
            letter-spacing: -1px;
        }

        .faq-hero h1 .highlight {
            background: var(--gradient-main);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .faq-hero p.sub {
            font-size: 17px;
            color: var(--text-secondary);
            max-width: 650px;
            margin: 0 auto 28px;
            line-height: 1.75;
        }

        .faq-search {
            max-width: 550px;
            margin: 0 auto;
            display: flex;
            gap: 10px;
            align-items: center;
            background: var(--bg-card);
            border-radius: var(--radius-full);
            padding: 6px 6px 6px 20px;
            border: 1px solid var(--border-subtle);
            transition: var(--transition);
        }

        .faq-search:focus-within {
            border-color: var(--border-glow);
            box-shadow: 0 0 30px var(--accent-glow);
        }

        .faq-search input {
            flex: 1;
            background: transparent;
            border: none;
            outline: none;
            color: var(--text-main);
            font-size: 14px;
            font-family: var(--font);
            letter-spacing: 0.2px;
        }

        .faq-search input::placeholder {
            color: var(--text-tertiary);
        }

        .faq-search button {
            background: var(--gradient-main);
            color: #0c0a14;
            border: none;
            border-radius: var(--radius-full);
            padding: 10px 24px;
            font-size: 13px;
            font-weight: 700;
            cursor: pointer;
            letter-spacing: 0.3px;
            transition: var(--transition);
            white-space: nowrap;
        }

        .faq-search button:hover {
            box-shadow: 0 4px 20px rgba(0, 229, 199, 0.35);
            transform: translateY(-1px);
        }

        /* ==================== 通用标题 ==================== */
        .section-title {
            text-align: center;
            margin-bottom: 52px;
        }
        .section-title h2 {
            font-size: 34px;
            font-weight: 800;
            color: var(--text-main);
            letter-spacing: -0.8px;
            line-height: 1.25;
        }
        .section-title h2 .gradient-text {
            background: var(--gradient-main);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .section-title p {
            color: var(--text-secondary);
            font-size: 17px;
            margin-top: 10px;
        }

        /* ==================== 分类导航（创意版块1） ==================== */
        .faq-categories {
            padding: 60px 0 40px;
            background: var(--bg-surface);
        }
        .category-grid {
            display: grid;
            grid-template-columns: repeat(5, 1fr);
            gap: 16px;
        }
        .category-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: 22px 14px;
            text-align: center;
            border: 1px solid var(--border-subtle);
            transition: var(--transition);
            cursor: pointer;
            box-shadow: var(--shadow-soft);
        }
        .category-card:hover {
            border-color: var(--border-glow);
            box-shadow: var(--shadow-glow);
            transform: translateY(-4px);
            background: var(--bg-card-hover);
        }
        .category-icon {
            font-size: 28px;
            margin-bottom: 8px;
            display: block;
        }
        .category-card h4 {
            font-size: 14px;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 4px;
        }
        .category-card .count {
            font-size: 11px;
            color: var(--text-tertiary);
        }

        /* ==================== 高频问题TOP榜（创意版块2） ==================== */
        .top-questions {
            padding: 60px 0;
            background: var(--bg-surface);
        }
        .top-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }
        .top-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: 22px 20px;
            border: 1px solid var(--border-subtle);
            transition: var(--transition);
            cursor: pointer;
            position: relative;
            overflow: hidden;
            box-shadow: var(--shadow-soft);
        }
        .top-card:hover {
            border-color: var(--border-glow);
            box-shadow: var(--shadow-faq);
            transform: translateY(-3px);
        }
        .top-rank {
            position: absolute;
            top: 8px;
            right: 14px;
            font-size: 48px;
            font-weight: 900;
            color: rgba(255, 255, 255, 0.04);
            line-height: 1;
            pointer-events: none;
        }
        .top-card h4 {
            font-size: 15px;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 8px;
            position: relative;
            z-index: 1;
            line-height: 1.45;
        }
        .top-card p {
            font-size: 12px;
            color: var(--text-tertiary);
            position: relative;
            z-index: 1;
            line-height: 1.6;
        }
        .top-card .view-count {
            display: inline-block;
            font-size: 11px;
            color: var(--accent);
            margin-top: 8px;
            letter-spacing: 0.3px;
            position: relative;
            z-index: 1;
        }

        /* ==================== 详细FAQ（按场景分类，创意版块3） ==================== */
        .faq-detail {
            padding: 70px 0;
            background: var(--bg-deep);
        }
        .faq-detail-list {
            display: flex;
            flex-direction: column;
            gap: 14px;
            max-width: 900px;
            margin: 0 auto;
        }
        .faq-detail-item {
            background: var(--bg-card);
            border-radius: var(--radius);
            border: 1px solid var(--border-subtle);
            overflow: hidden;
            transition: var(--transition);
            box-shadow: var(--shadow-soft);
        }
        .faq-detail-item:hover {
            border-color: var(--border-glow);
            box-shadow: var(--shadow-glow);
        }
        .faq-detail-question {
            padding: 18px 24px;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            font-size: 15px;
            font-weight: 700;
            color: var(--text-main);
            letter-spacing: 0.2px;
            transition: var(--transition);
            background: transparent;
            border: none;
            width: 100%;
            text-align: left;
            font-family: var(--font);
        }
        .faq-detail-question:hover {
            color: var(--accent);
        }
        .faq-detail-question .faq-badge {
            background: var(--gradient-main);
            color: #0c0a14;
            font-size: 11px;
            font-weight: 800;
            padding: 2px 10px;
            border-radius: 4px;
            flex-shrink: 0;
            letter-spacing: 0.5px;
        }
        .faq-detail-question .toggle-icon {
            font-size: 18px;
            color: var(--text-tertiary);
            transition: var(--transition);
            flex-shrink: 0;
        }
        .faq-detail-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.5s cubic-bezier(0.4, 0, 0.2, 1);
            padding: 0 24px;
        }
        .faq-detail-item.open .faq-detail-answer {
            max-height: 600px;
        }
        .faq-detail-item.open .toggle-icon {
            transform: rotate(45deg);
            color: var(--accent);
        }
        .faq-detail-answer-inner {
            padding: 0 0 20px;
            color: var(--text-secondary);
            font-size: 14px;
            line-height: 1.8;
        }
        .faq-detail-answer-inner .step-list {
            list-style: none;
            padding: 0;
            margin-top: 10px;
        }
        .faq-detail-answer-inner .step-list li {
            padding: 8px 0 8px 26px;
            position: relative;
            border-bottom: 1px solid rgba(255, 255, 255, 0.03);
        }
        .faq-detail-answer-inner .step-list li:last-child {
            border-bottom: none;
        }
        .faq-detail-answer-inner .step-list li::before {
            content: '→';
            position: absolute;
            left: 0;
            color: var(--accent);
            font-weight: 700;
        }
        .faq-detail-answer-inner strong {
            color: var(--text-main);
            font-weight: 600;
        }

        /* ==================== 故障排查决策树（创意版块4） ==================== */
        .troubleshoot {
            padding: 70px 0;
            background: var(--bg-surface);
        }
        .troubleshoot-flow {
            max-width: 750px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 16px;
        }
        .flow-node {
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: 20px 24px;
            border: 1px solid var(--border-subtle);
            transition: var(--transition);
            position: relative;
        }
        .flow-node:hover {
            border-color: var(--border-glow);
            box-shadow: var(--shadow-glow);
        }
        .flow-node .flow-question {
            font-size: 15px;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 8px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .flow-node .flow-answer {
            font-size: 13px;
            color: var(--text-secondary);
            line-height: 1.7;
        }
        .flow-node .flow-arrow {
            position: absolute;
            left: 50%;
            bottom: -16px;
            transform: translateX(-50%);
            font-size: 20px;
            color: var(--accent);
            opacity: 0.5;
        }
        .flow-node:last-child .flow-arrow {
            display: none;
        }
        .flow-node .flow-icon {
            font-size: 22px;
            flex-shrink: 0;
        }

        /* ==================== 自助解决工具（创意版块5） ==================== */
        .self-help {
            padding: 70px 0;
            background: var(--bg-deep);
        }
        .self-help-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .self-help-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: 28px 22px;
            text-align: center;
            border: 1px solid var(--border-subtle);
            transition: var(--transition);
            box-shadow: var(--shadow-soft);
        }
        .self-help-card:hover {
            border-color: var(--border-glow);
            box-shadow: var(--shadow-glow);
            transform: translateY(-4px);
        }
        .self-help-icon {
            font-size: 36px;
            margin-bottom: 12px;
            display: block;
        }
        .self-help-card h4 {
            font-size: 16px;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 8px;
        }
        .self-help-card p {
            font-size: 13px;
            color: var(--text-tertiary);
            line-height: 1.65;
        }
        .self-help-card .btn-help {
            display: inline-block;
            background: rgba(255, 255, 255, 0.06);
            color: var(--text-main);
            font-size: 12px;
            font-weight: 600;
            padding: 8px 18px;
            border-radius: var(--radius-full);
            border: 1px solid var(--border-subtle);
            margin-top: 12px;
            transition: var(--transition);
        }
        .self-help-card .btn-help:hover {
            border-color: var(--border-glow);
            box-shadow: 0 0 16px var(--accent-glow);
            background: rgba(255, 255, 255, 0.1);
        }

        /* ==================== 客服响应统计（创意版块6） ==================== */
        .support-stats {
            padding: 70px 0;
            background: var(--bg-surface);
        }
        .support-stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            text-align: center;
        }
        .support-stat-item {
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: 24px 16px;
            border: 1px solid var(--border-subtle);
            transition: var(--transition);
        }
        .support-stat-item:hover {
            border-color: var(--border-glow);
            box-shadow: var(--shadow-glow);
        }
        .support-stat-item .stat-number {
            font-size: 34px;
            font-weight: 900;
            background: var(--gradient-main);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            letter-spacing: -0.5px;
        }
        .support-stat-item .stat-label {
            font-size: 13px;
            color: var(--text-secondary);
            margin-top: 4px;
            letter-spacing: 0.3px;
        }

        /* ==================== 数据统计 ==================== */
        .faq-stats {
            padding: 70px 0;
            background: var(--bg-deep);
            border-top: 1px solid var(--border-subtle);
            border-bottom: 1px solid var(--border-subtle);
        }
        .faq-stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 30px;
            text-align: center;
        }
        .faq-stats-grid .stat-number {
            font-size: 38px;
            font-weight: 900;
            background: var(--gradient-main);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            letter-spacing: -1px;
        }
        .faq-stats-grid .stat-label {
            font-size: 14px;
            color: var(--text-secondary);
            margin-top: 4px;
            letter-spacing: 0.3px;
        }

        /* ==================== 联系支持CTA ==================== */
        .support-cta {
            padding: 70px 0;
            background: var(--bg-surface);
        }
        .cta-container {
            max-width: 700px;
            margin: 0 auto;
            text-align: center;
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            padding: 40px 30px;
            border: 1px solid var(--border-subtle);
            box-shadow: var(--shadow-soft);
        }
        .cta-container h3 {
            font-size: 24px;
            font-weight: 800;
            color: var(--text-main);
            margin-bottom: 12px;
        }
        .cta-container p {
            font-size: 15px;
            color: var(--text-secondary);
            margin-bottom: 20px;
            line-height: 1.7;
        }
        .cta-actions {
            display: flex;
            gap: 14px;
            justify-content: center;
            flex-wrap: wrap;
        }
        .btn-primary {
            display: inline-block;
            background: var(--gradient-main);
            color: #0c0a14;
            font-size: 15px;
            font-weight: 700;
            padding: 13px 32px;
            border-radius: var(--radius-full);
            transition: var(--transition);
            box-shadow: 0 4px 28px rgba(0, 229, 199, 0.3);
            letter-spacing: 0.4px;
            border: none;
            cursor: pointer;
        }
        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 40px rgba(0, 229, 199, 0.45);
        }
        .btn-secondary {
            display: inline-block;
            background: rgba(255, 255, 255, 0.05);
            color: var(--text-main);
            font-size: 14px;
            font-weight: 500;
            padding: 13px 28px;
            border-radius: var(--radius-full);
            border: 1px solid var(--border-subtle);
            transition: var(--transition);
            letter-spacing: 0.3px;
        }
        .btn-secondary:hover {
            background: rgba(255, 255, 255, 0.1);
            border-color: var(--border-glow);
            box-shadow: 0 0 28px var(--accent-glow);
        }

        /* ==================== Footer（与首页一致） ==================== */
        .footer {
            background: var(--bg-deep);
            color: var(--text-secondary);
            padding: 60px 0 32px;
            border-top: 1px solid var(--border-subtle);
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.5fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-brand p {
            font-size: 13px;
            line-height: 1.8;
            max-width: 280px;
            margin-top: 10px;
            color: var(--text-tertiary);
        }
        .footer-col h5 {
            color: var(--text-main);
            font-size: 15px;
            font-weight: 700;
            margin-bottom: 14px;
            letter-spacing: 0.2px;
        }
        .footer-col a {
            display: block;
            font-size: 13px;
            padding: 4px 0;
            color: var(--text-secondary);
            transition: var(--transition);
        }
        .footer-col a:hover {
            color: var(--accent);
        }
        .footer-bottom {
            border-top: 1px solid var(--border-subtle);
            padding-top: 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 12px;
            color: var(--text-tertiary);
        }

        /* ==================== 响应式 ==================== */
        @media (max-width: 1024px) {
            .category-grid {
                grid-template-columns: repeat(3, 1fr);
            }
            .top-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .self-help-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
            .support-stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .faq-stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 768px) {
            .nav {
                display: none;
            }
            .mobile-toggle {
                display: flex;
            }
            .faq-hero h1 {
                font-size: 30px;
            }
            .faq-hero p.sub {
                font-size: 15px;
            }
            .faq-hero {
                padding: 130px 0 50px;
                min-height: auto;
            }
            .category-grid,
            .top-grid,
            .self-help-grid {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .section-title h2 {
                font-size: 26px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .support-stats-grid,
            .faq-stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 16px;
            }
            .faq-search {
                flex-direction: column;
                border-radius: var(--radius);
                padding: 12px;
            }
            .faq-search button {
                width: 100%;
                padding: 12px;
            }
        }

        @media (max-width: 480px) {
            .container {
                padding: 0 14px;
            }
            .faq-hero h1 {
                font-size: 24px;
            }
            .faq-hero p.sub {
                font-size: 13px;
            }
            .section-title h2 {
                font-size: 22px;
            }
            .support-stats-grid .stat-number,
            .faq-stats-grid .stat-number {
                font-size: 28px;
            }
            .faq-detail-question {
                font-size: 13px;
                padding: 14px 16px;
            }
            .faq-detail-answer {
                padding: 0 16px;
            }
        }