:root {
            --primary: #00FFC8;
            --primary-dark: #00D4A8;
            --primary-light: #66FFDC;
            --accent: #7C3AED;
            --cyan: #38BDF8;
            --success: #00E5A0;
            --warning: #FFB800;
            --bg: #060608;
            --bg-2: #0A0A12;
            --card: #0D0D18;
            --card-2: #121222;
            --text: #EDEDF5;
            --text-secondary: #9A9AB0;
            --text-muted: #666680;
            --border: #1E1E32;
            --radius: 18px;
            --radius-sm: 12px;
            --shadow: 0 8px 30px rgba(0,0,0,0.45);
            --shadow-lg: 0 18px 50px rgba(0,0,0,0.6);
            --gradient: linear-gradient(135deg, #00FFC8, #38BDF8);
            --gradient-soft: linear-gradient(135deg, rgba(0,255,200,0.1), rgba(56,189,248,0.1));
            --glow-green: 0 0 30px rgba(0,255,200,0.3);
            --glow-purple: 0 0 30px rgba(124,58,237,0.3);
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
            color: var(--text);
            background: var(--bg);
            line-height: 1.7;
            overflow-x: hidden;
        }
        a {
            text-decoration: none;
            color: inherit;
        }
        img {
            max-width: 100%;
            display: block;
        }

        .progress-bar {
            position: fixed;
            top: 0;
            left: 0;
            height: 3px;
            background: var(--gradient);
            z-index: 10001;
            width: 0;
            transition: width .2s;
        }

        .trustbar {
            background: #0D0D18;
            color: #B0B0C8;
            font-size: 12px;
            padding: 8px 0;
            position: relative;
            z-index: 10002;
            border-bottom: 1px solid var(--border);
        }
        .trustbar-inner {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 24px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            flex-wrap: wrap;
        }
        .trustbar a {
            color: var(--primary);
        }
        .trustbar a:hover {
            color: var(--primary-light);
        }

        .header {
            position: fixed;
            top: 36px;
            left: 0;
            right: 0;
            z-index: 10000;
            padding: 14px 0;
            transition: all .3s;
        }
        .header.scrolled {
            top: 0;
            background: rgba(6,6,8,0.88);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            box-shadow: 0 1px 0 rgba(255,255,255,0.05);
            border-bottom: 1px solid rgba(30,30,50,0.7);
        }
        .header-inner {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 24px;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 22px;
            font-weight: 800;
            color: #fff;
        }
        .logo img {
            height: 36px;
            width: auto;
        }
        .logo .logo-tag {
            font-size: 11px;
            color: var(--primary);
            border: 1px solid rgba(0,255,200,0.4);
            border-radius: 20px;
            padding: 2px 8px;
            letter-spacing: 0.5px;
        }
        .nav {
            display: flex;
            align-items: center;
            gap: 22px;
            list-style: none;
        }
        .nav a {
            color: var(--text-secondary);
            font-size: 14px;
            font-weight: 500;
            transition: color .2s;
            white-space: nowrap;
            position: relative;
        }
        .nav a::after {
            content: '';
            position: absolute;
            left: 50%;
            bottom: -6px;
            width: 0;
            height: 2px;
            background: var(--gradient);
            transition: all .25s;
            transform: translateX(-50%);
            border-radius: 2px;
        }
        .nav a:hover {
            color: #fff;
        }
        .nav a:hover::after {
            width: 100%;
        }
        .nav a.active {
            color: var(--primary);
        }
        .nav a.active::after {
            width: 100%;
        }
        .nav-cta {
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 11px 22px;
            border-radius: 10px;
            font-size: 15px;
            font-weight: 700;
            cursor: pointer;
            border: none;
            transition: all .25s;
            white-space: nowrap;
        }
        .btn-primary {
            background: var(--gradient);
            color: #060608;
            box-shadow: 0 6px 22px rgba(0,255,200,0.3);
        }
        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 10px 30px rgba(0,255,200,0.45);
        }
        .btn-outline {
            border: 2px solid rgba(0,255,200,0.6);
            color: var(--primary);
            background: transparent;
        }
        .btn-outline:hover {
            background: rgba(0,255,200,0.08);
            color: var(--primary-light);
        }
        .btn-lg {
            padding: 16px 34px;
            font-size: 17px;
            border-radius: 12px;
        }
        .btn-xl {
            padding: 20px 46px;
            font-size: 19px;
            border-radius: 14px;
        }
        .btn-ghost {
            background: rgba(255,255,255,0.05);
            color: #fff;
            border: 1px solid rgba(255,255,255,0.12);
        }
        .btn-ghost:hover {
            background: rgba(255,255,255,0.1);
        }
        .hamburger {
            display: none;
            flex-direction: column;
            gap: 5px;
            cursor: pointer;
            background: none;
            border: none;
            padding: 8px;
        }
        .hamburger span {
            display: block;
            width: 24px;
            height: 2px;
            background: #fff;
            border-radius: 2px;
            transition: all .3s;
        }

        .section {
            padding: 96px 24px;
        }
        .section-inner {
            max-width: 1280px;
            margin: 0 auto;
        }
        .section-label {
            text-align: center;
            font-size: 13px;
            font-weight: 700;
            color: var(--primary);
            text-transform: uppercase;
            letter-spacing: 3px;
            margin-bottom: 14px;
        }
        .section-title {
            text-align: center;
            font-size: clamp(28px, 3.4vw, 40px);
            font-weight: 800;
            margin-bottom: 16px;
            color: #fff;
        }
        .section-desc {
            text-align: center;
            font-size: 17px;
            color: var(--text-secondary);
            max-width: 680px;
            margin: 0 auto 54px;
        }

        /* ========== 智囊中枢主视觉 ========== */
        .faq-hero {
            padding-top: 140px;
            padding-bottom: 60px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .faq-hero-bg {
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 20% 40%, rgba(0,255,200,0.12) 0%, transparent 55%),
                radial-gradient(ellipse at 80% 30%, rgba(56,189,248,0.12) 0%, transparent 55%),
                radial-gradient(ellipse at 50% 100%, rgba(124,58,237,0.07) 0%, transparent 60%);
            z-index: 0;
        }
        .faq-hero-content {
            position: relative;
            z-index: 1;
        }
        .brain-icon {
            font-size: 72px;
            display: block;
            margin-bottom: 18px;
            animation: brain-pulse 3s ease-in-out infinite;
        }
        @keyframes brain-pulse {
            0%,
            100% {
                transform: scale(1);
            }
            50% {
                transform: scale(1.05);
            }
        }
        .faq-search-bar {
            max-width: 560px;
            margin: 30px auto 0;
            display: flex;
            gap: 10px;
        }
        .faq-search-input {
            flex: 1;
            padding: 14px 20px;
            border-radius: 12px;
            border: 1px solid var(--border);
            background: var(--card);
            color: #fff;
            font-size: 15px;
            outline: none;
            transition: all .2s;
        }
        .faq-search-input:focus {
            border-color: var(--primary);
            box-shadow: var(--glow-green);
        }
        .faq-search-input::placeholder {
            color: var(--text-muted);
        }

        /* ========== 分类导航卡片 ========== */
        .category-nav-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 16px;
            margin-top: 40px;
        }
        .category-nav-card {
            background: var(--card);
            border-radius: var(--radius-sm);
            padding: 24px 16px;
            border: 1px solid var(--border);
            text-align: center;
            transition: all .3s;
            cursor: pointer;
        }
        .category-nav-card:hover {
            border-color: var(--primary);
            box-shadow: var(--glow-green);
            transform: translateY(-4px);
        }
        .category-nav-icon {
            font-size: 36px;
            margin-bottom: 10px;
        }
        .category-nav-card h3 {
            font-size: 15px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 4px;
        }
        .category-nav-card p {
            font-size: 11px;
            color: var(--text-muted);
        }

        /* ========== FAQ折叠面板 ========== */
        .faq-category-section {
            margin-bottom: 40px;
        }
        .faq-category-title {
            font-size: 22px;
            font-weight: 700;
            margin-bottom: 18px;
            color: #fff;
            padding-bottom: 10px;
            border-bottom: 2px solid var(--primary);
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .faq-item {
            background: var(--card);
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            margin-bottom: 12px;
            overflow: hidden;
            transition: all .2s;
        }
        .faq-item:hover {
            border-color: rgba(0,255,200,0.3);
        }
        .faq-question {
            padding: 18px 22px;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            color: #fff;
            transition: all .2s;
            gap: 12px;
        }
        .faq-question:hover {
            color: var(--primary);
        }
        .faq-question .arrow {
            transition: transform .3s;
            font-size: 12px;
            color: var(--primary);
            flex-shrink: 0;
        }
        .faq-question.open .arrow {
            transform: rotate(180deg);
        }
        .faq-answer {
            padding: 0 22px;
            max-height: 0;
            overflow: hidden;
            transition: all .35s;
            color: var(--text-secondary);
            font-size: 15px;
            line-height: 1.8;
        }
        .faq-answer.open {
            padding: 0 22px 22px;
            max-height: 800px;
        }
        .faq-answer .step {
            display: flex;
            gap: 10px;
            margin-bottom: 9px;
        }
        .faq-answer .step-num {
            font-weight: 800;
            color: var(--primary);
            min-width: 22px;
            flex-shrink: 0;
        }

        /* ========== 快速诊断器 ========== */
        .diagnostic-section {
            background: var(--bg-2);
            border-top: 1px solid var(--border);
            border-bottom: 1px solid var(--border);
        }
        .diagnostic-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
            margin-top: 40px;
        }
        .diagnostic-card {
            background: var(--card);
            border-radius: var(--radius);
            padding: 28px 22px;
            border: 1px solid var(--border);
            text-align: center;
            transition: all .3s;
            cursor: pointer;
        }
        .diagnostic-card:hover {
            border-color: var(--primary);
            box-shadow: var(--glow-green);
            transform: translateY(-4px);
        }
        .diagnostic-icon {
            font-size: 44px;
            margin-bottom: 12px;
        }
        .diagnostic-card h3 {
            font-size: 17px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 8px;
        }
        .diagnostic-card p {
            font-size: 13px;
            color: var(--text-secondary);
            line-height: 1.6;
        }
        .diagnostic-btn {
            display: inline-block;
            margin-top: 14px;
            padding: 6px 16px;
            border-radius: 16px;
            background: var(--gradient-soft);
            color: var(--primary);
            font-size: 12px;
            font-weight: 700;
            border: 1px solid rgba(0,255,200,0.3);
            transition: all .2s;
        }
        .diagnostic-card:hover .diagnostic-btn {
            background: var(--gradient);
            color: #060608;
        }

        /* ========== 策略库 / 极速秘籍 ========== */
        .strategy-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 20px;
            margin-top: 40px;
        }
        .strategy-card {
            background: var(--card);
            border-radius: var(--radius);
            padding: 28px 24px;
            border: 1px solid var(--border);
            transition: all .3s;
            position: relative;
            overflow: hidden;
        }
        .strategy-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: var(--gradient);
            opacity: 0;
            transition: opacity .3s;
        }
        .strategy-card:hover {
            border-color: rgba(0,255,200,0.5);
            box-shadow: var(--shadow);
            transform: translateY(-4px);
        }
        .strategy-card:hover::before {
            opacity: 1;
        }
        .strategy-icon {
            font-size: 36px;
            margin-bottom: 12px;
        }
        .strategy-card h3 {
            font-size: 18px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 8px;
        }
        .strategy-card p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 12px;
        }
        .strategy-tip {
            background: rgba(0,255,200,0.06);
            border-left: 3px solid var(--primary);
            padding: 10px 14px;
            border-radius: 8px;
            font-size: 13px;
            color: var(--primary);
            font-weight: 600;
        }

        /* ========== 故障排查决策树 ========== */
        .troubleshoot-tree {
            max-width: 800px;
            margin: 40px auto 0;
        }
        .tree-node {
            background: var(--card);
            border-radius: var(--radius-sm);
            padding: 18px 20px;
            border: 1px solid var(--border);
            margin-bottom: 10px;
            text-align: center;
            transition: all .3s;
        }
        .tree-node.question {
            border-left: 4px solid var(--warning);
        }
        .tree-node.solution {
            border-left: 4px solid var(--success);
        }
        .tree-node:hover {
            border-color: var(--primary);
            box-shadow: var(--shadow);
        }
        .tree-node h4 {
            font-size: 15px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 4px;
        }
        .tree-node p {
            font-size: 13px;
            color: var(--text-secondary);
            line-height: 1.6;
        }
        .tree-arrow {
            text-align: center;
            font-size: 20px;
            color: var(--text-muted);
            margin: 4px 0;
        }

        /* ========== 支持渠道 ========== */
        .support-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            margin-top: 40px;
        }
        .support-card {
            background: var(--card);
            border-radius: var(--radius-sm);
            padding: 26px 18px;
            border: 1px solid var(--border);
            text-align: center;
            transition: all .3s;
        }
        .support-card:hover {
            border-color: var(--primary);
            box-shadow: var(--glow-green);
            transform: translateY(-4px);
        }
        .support-icon {
            font-size: 40px;
            margin-bottom: 12px;
        }
        .support-card h3 {
            font-size: 16px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 8px;
        }
        .support-card p {
            font-size: 13px;
            color: var(--text-secondary);
            line-height: 1.6;
            margin-bottom: 8px;
        }
        .support-metric {
            font-size: 22px;
            font-weight: 800;
            color: var(--primary);
        }

        /* ========== 用户评价/反馈 ========== */
        .feedback-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
            margin-top: 40px;
        }
        .feedback-card {
            background: var(--card);
            border-radius: var(--radius-sm);
            padding: 22px 18px;
            border: 1px solid var(--border);
        }
        .feedback-stars {
            color: var(--warning);
            font-size: 13px;
            margin-bottom: 8px;
        }
        .feedback-text {
            font-size: 13px;
            color: var(--text-secondary);
            line-height: 1.6;
            margin-bottom: 10px;
        }
        .feedback-author {
            font-size: 12px;
            font-weight: 700;
            color: #fff;
        }
        .feedback-date {
            font-size: 11px;
            color: var(--text-muted);
        }

        .footer {
            background: #040406;
            color: #9A9AB0;
            padding: 64px 24px 30px;
            border-top: 1px solid var(--border);
        }
        .footer-inner {
            max-width: 1280px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr 1.5fr;
            gap: 40px;
        }
        .footer h4 {
            color: #fff;
            font-size: 15px;
            font-weight: 700;
            margin-bottom: 16px;
        }
        .footer a {
            color: #9A9AB0;
            font-size: 14px;
            display: block;
            margin-bottom: 9px;
            transition: color .2s;
        }
        .footer a:hover {
            color: #fff;
            text-decoration: underline;
        }
        .footer-brand p {
            font-size: 14px;
            line-height: 1.8;
            margin: 14px 0;
        }
        .footer-brand .footer-logo {
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .footer-brand .footer-logo img {
            height: 32px;
        }
        .footer-brand .footer-logo span {
            color: #fff;
            font-size: 20px;
            font-weight: 800;
        }
        .footer-warning {
            margin-top: 20px;
            padding: 12px 16px;
            background: rgba(255,184,0,0.06);
            border: 1px solid rgba(255,184,0,0.22);
            border-radius: 10px;
            font-size: 13px;
            color: var(--warning);
            line-height: 1.7;
        }
        .footer-bottom {
            max-width: 1280px;
            margin: 44px auto 0;
            padding-top: 26px;
            border-top: 1px solid rgba(255,255,255,0.08);
            text-align: center;
            font-size: 13px;
            color: #666680;
        }
        .footer-bottom a {
            color: #9A9AB0;
            display: inline;
        }
        .friend-links {
            margin-top: 20px;
            padding: 16px 0;
            text-align: center;
        }
        .friend-links a {
            display: inline !important;
            margin: 0 8px;
        }

        .sticky-cta {
            position: fixed;
            bottom: 24px;
            right: 24px;
            z-index: 9999;
        }
        .sticky-cta .btn-circle {
            width: 60px;
            height: 60px;
            border-radius: 50%;
            background: var(--gradient);
            color: #060608;
            border: none;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            box-shadow: 0 6px 26px rgba(0,255,200,0.4);
            animation: float 2s ease-in-out infinite;
            text-decoration: none;
        }
        .sticky-cta .btn-circle:hover {
            transform: scale(1.1);
        }

        @keyframes float {
            0%,
            100% {
                transform: translateY(0);
            }
            50% {
                transform: translateY(-10px);
            }
        }

        @media (max-width:1024px) {
            .category-nav-grid,
            .diagnostic-grid,
            .support-grid,
            .feedback-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .strategy-grid {
                grid-template-columns: 1fr;
            }
        }
        @media (max-width:768px) {
            .nav {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 100%;
                left: 0;
                right: 0;
                background: rgba(6,6,8,0.97);
                backdrop-filter: blur(20px);
                padding: 20px;
                gap: 16px;
                border-bottom: 1px solid var(--border);
            }
            .nav.open {
                display: flex;
            }
            .hamburger {
                display: flex;
            }
            .nav-cta {
                display: none;
            }
            .category-nav-grid,
            .diagnostic-grid,
            .support-grid,
            .feedback-grid {
                grid-template-columns: 1fr;
            }
            .faq-search-bar {
                flex-direction: column;
                padding: 0 20px;
            }
            .footer-inner {
                grid-template-columns: 1fr 1fr;
            }
        }