/* ===================================================================
           设计系统  —— Stripe / Linear / Anthropic 风格
        =================================================================== */
        :root {
            /* 配色 - 暖白底 + 单一冷蓝强调色 */
            --color-bg: #FAFAF9;
            --color-bg-card: #FFFFFF;
            --color-bg-elev: #F5F5F4;
            --color-text: #0A0A0A;
            --color-text-muted: #525252;
            --color-text-soft: #737373;
            --color-border: #E7E5E4;
            --color-border-strong: #D6D3D1;
            --color-accent: #2563EB;
            --color-accent-hover: #1D4ED8;
            --color-accent-soft: #EFF6FF;
            --color-success: #16A34A;
            --color-price: #DC2626;
            --footer-bg: #0A0A0A;

            /* 字体栈 */
            --font-display: "Bricolage Grotesque", "PingFang SC", "Source Han Sans CN", -apple-system, BlinkMacSystemFont, sans-serif;
            --font-serif: "Fraunces", "Source Han Serif SC", "Songti SC", Georgia, serif;
            --font-body: "Plus Jakarta Sans", "PingFang SC", "Source Han Sans CN", -apple-system, BlinkMacSystemFont, sans-serif;
            --font-mono: "Geist Mono", "JetBrains Mono", ui-monospace, "SF Mono", monospace;

            /* 阴影 */
            --shadow-sm: 0 1px 2px rgba(10, 10, 10, 0.04);
            --shadow-md: 0 4px 12px rgba(10, 10, 10, 0.06);
            --shadow-lg: 0 12px 32px rgba(10, 10, 10, 0.08);

            --section-y: clamp(4rem, 10vh, 8rem);
        }

        /* 暗黑模式配色（点击月亮图标生效） */
        html.dark {
            --color-bg: #0A0A0A;
            --color-bg-card: #18181B;
            --color-bg-elev: #1F1F23;
            --color-text: #FAFAFA;
            --color-text-muted: #A1A1AA;
            --color-text-soft: #71717A;
            --color-border: #27272A;
            --color-border-strong: #3F3F46;
            --color-accent: #60A5FA;
            --color-accent-hover: #93C5FD;
            --color-accent-soft: #1E293B;
            --footer-bg: #000000;
        }

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

        html {
            font-family: var(--font-body);
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            text-rendering: optimizeLegibility;
        }

        body {
            line-height: 1.6;
            color: var(--color-text);
            background-color: var(--color-bg);
            overflow-x: hidden;
            transition: background-color 0.3s, color 0.3s;
        }

        h1, h2, h3 {
            font-family: var(--font-display);
            letter-spacing: -0.02em;
            color: var(--color-text);
        }

        .num {
            font-family: var(--font-mono);
            font-variant-numeric: tabular-nums;
            font-feature-settings: "tnum";
        }

        /* === 按钮 === */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.75rem 1.5rem;
            border-radius: 0.625rem;
            font-weight: 600;
            font-size: 0.95rem;
            transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
            text-decoration: none;
            border: 1px solid transparent;
            cursor: pointer;
            white-space: nowrap;
            font-family: var(--font-body);
        }
        .btn-primary-new {
            background: var(--color-text);
            color: var(--color-bg);
            box-shadow: var(--shadow-sm);
        }
        .btn-primary-new:hover {
            background: var(--color-accent);
            color: #fff;
            transform: translateY(-1px);
            box-shadow: var(--shadow-md);
        }
        .btn-secondary-new {
            background: transparent;
            color: var(--color-text);
            border-color: var(--color-border-strong);
        }
        .btn-secondary-new:hover {
            background: var(--color-bg-elev);
            border-color: var(--color-text);
        }

        /* === 入场动画 === */
        @keyframes rise-in {
            from { opacity: 0; transform: translateY(12px); }
            to { opacity: 1; transform: translateY(0); }
        }
        .rise-in { animation: rise-in 0.6s cubic-bezier(0.4, 0, 0.2, 1) backwards; }

        /* === 网格背景 === */
        .grid-bg {
            background-image:
                linear-gradient(var(--color-border) 1px, transparent 1px),
                linear-gradient(to right, var(--color-border) 1px, transparent 1px);
            background-size: 64px 64px;
            -webkit-mask-image: radial-gradient(ellipse 80% 50% at 50% 0%, black 40%, transparent 90%);
            mask-image: radial-gradient(ellipse 80% 50% at 50% 0%, black 40%, transparent 90%);
        }

        .badge-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--color-success); }

        /* === Section 通用 === */
        .section { padding: var(--section-y) 1rem; }
        .section-inner { max-width: 1200px; margin: 0 auto; }
        .section-header { text-align: center; margin-bottom: 3.5rem; }
        .section-eyebrow {
            display: inline-block;
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--color-accent);
            letter-spacing: 0.02em;
            margin-bottom: 1rem;
            text-transform: uppercase;
        }
        .section-title {
            font-size: clamp(1.875rem, 4vw, 2.75rem);
            font-weight: 700;
            line-height: 1.15;
            letter-spacing: -0.025em;
            margin-bottom: 0.75rem;
        }
        .section-desc {
            color: var(--color-text-muted);
            font-size: 1.05rem;
            max-width: 560px;
            margin: 0 auto;
            line-height: 1.6;
        }

        /* ===================================================================
           导航
        =================================================================== */
        .nav-main {
            position: sticky; top: 0; z-index: 50;
            background: color-mix(in srgb, var(--color-bg) 85%, transparent);
            backdrop-filter: saturate(180%) blur(20px);
            -webkit-backdrop-filter: saturate(180%) blur(20px);
            border-bottom: 1px solid var(--color-border);
        }
        .nav-inner {
            max-width: 1200px; margin: 0 auto;
            padding: 0.875rem 1.5rem;
            display: flex; align-items: center; gap: 1.5rem;
        }
        .nav-logo {
            display: inline-flex; align-items: center; gap: 0.5rem;
            font-family: var(--font-display); font-weight: 700; font-size: 1.1rem;
            color: var(--color-text); text-decoration: none;
            letter-spacing: -0.01em; flex-shrink: 0;
        }
        .nav-logo svg { width: 22px; height: 22px; color: var(--color-accent); }
        .nav-links {
            flex: 1; display: flex; align-items: center; justify-content: center; gap: 1.75rem;
            margin: 0 1rem; font-size: 0.9rem; color: var(--color-text-muted);
            overflow-x: auto; scrollbar-width: none;
        }
        .nav-links::-webkit-scrollbar { display: none; }
        .nav-links a {
            color: inherit; white-space: nowrap;
            transition: color 0.15s, text-decoration-color 0.15s; font-weight: 500;
            text-decoration: underline; text-decoration-color: var(--color-border-strong);
            text-underline-offset: 5px; text-decoration-thickness: 1.5px;
        }
        .nav-links a:hover { color: var(--color-accent); text-decoration-color: var(--color-accent); }
        .nav-actions { display: flex; align-items: center; gap: 0.5rem; flex-shrink: 0; }
        .nav-icon-btn {
            width: 36px; height: 36px;
            display: inline-flex; align-items: center; justify-content: center;
            background: transparent; border: 1px solid var(--color-border);
            border-radius: 0.5rem; color: var(--color-text-muted);
            cursor: pointer; transition: all 0.15s; font-size: 0.9rem;
        }
        .nav-icon-btn:hover { background: var(--color-bg-elev); color: var(--color-text); }
        @media (max-width: 768px) {
            .nav-inner { padding: 0.75rem 1rem; gap: 0.75rem; }
            .nav-links { margin-left: 0.5rem; gap: 1.25rem; font-size: 0.85rem; }
            .nav-link-extra { display: none; }
            .nav-logo span { display: none; }
            .nav-actions .btn { padding: 0.5rem 0.875rem; font-size: 0.85rem; }
        }

        /* ===================================================================
           Hero
        =================================================================== */
        .hero { position: relative; padding: 3.5rem 1.5rem 6rem; overflow: hidden; background: var(--color-bg); }
        .hero-grid { position: absolute; inset: 0; opacity: 0.5; pointer-events: none; }
        .hero-inner { max-width: 880px; margin: 0 auto; position: relative; z-index: 1; text-align: center; }
        .hero-eyebrow {
            display: inline-flex; align-items: center; gap: 0.5rem;
            padding: 0.375rem 0.875rem;
            border: 1px solid var(--color-border); background: var(--color-bg-card);
            border-radius: 999px; font-size: 0.85rem; color: var(--color-text-muted);
            margin-bottom: 2rem; box-shadow: var(--shadow-sm);
        }
        .hero-eyebrow-divider { color: var(--color-border-strong); }
        .hero-slogan {
            font-family: var(--font-display); font-size: clamp(1rem, 2.4vw, 1.45rem); color: var(--color-text-muted);
            font-weight: 600; letter-spacing: 0.02em;
            margin: 0 auto 1.5rem;
        }
        .hero-slogan::before { content: "— "; opacity: 0.5; }
        .hero-slogan::after { content: " —"; opacity: 0.5; }
        .hero-slogan-em { color: var(--color-accent); font-weight: 800; font-size: 1.18em; letter-spacing: 0.01em; }
        .hero-title {
            font-family: var(--font-serif); font-size: clamp(2.5rem, 6.5vw, 4.75rem);
            font-weight: 400; line-height: 1.05; margin-bottom: 1.5rem;
            letter-spacing: -0.025em; font-variation-settings: "opsz" 96;
        }
        .hero-title-accent {
            font-family: var(--font-serif); font-style: italic; font-weight: 500;
            color: var(--color-text-muted); font-variation-settings: "opsz" 96;
        }
        .hero-subtitle {
            font-size: clamp(1.2rem, 2.3vw, 1.5rem); color: var(--color-text);
            font-weight: 500; line-height: 1.5; max-width: 720px; margin: 0 auto 0.85rem;
        }
        .hero-subtitle strong { font-weight: 700; }
        .hero-meta {
            font-family: var(--font-mono); font-size: 0.82rem; color: var(--color-text-soft);
            margin: 0 auto 2.25rem;
        }
        .hero-meta strong { color: var(--color-text); font-weight: 600; }
        .hero-meta-sep { color: var(--color-border-strong); margin: 0 0.55rem; }
        .hero-cta { display: flex; justify-content: center; gap: 0.75rem; flex-wrap: wrap; margin-bottom: 2.5rem; }
        .hero-trust { display: flex; justify-content: center; gap: 2rem; flex-wrap: wrap; margin-bottom: 2rem; }
        .hero-trust-item {
            display: inline-flex; align-items: center; gap: 0.5rem;
            color: var(--color-text-soft); font-size: 0.875rem; font-weight: 500;
        }
        .hero-trust-item svg { color: var(--color-accent); }
        .hero-contact {
            font-size: 0.875rem; color: var(--color-text-soft);
            display: flex; align-items: center; gap: 0.5rem; flex-wrap: wrap; justify-content: center;
        }
        .hero-contact + .hero-contact { margin-top: 0.5rem; }
        .hero-wechat {
            font-family: var(--font-mono); font-size: 0.85rem; background: var(--color-bg-elev);
            padding: 0.2rem 0.5rem; border-radius: 0.375rem; color: var(--color-text);
            border: 1px solid var(--color-border);
        }
        .hero-wechat-copy {
            font-size: 0.8rem; color: var(--color-accent); background: transparent;
            border: none; cursor: pointer; padding: 0.2rem 0.4rem; border-radius: 0.25rem; font-weight: 600;
        }
        .hero-wechat-copy:hover { background: var(--color-accent-soft); }
        @media (max-width: 768px) {
            .hero { padding: 4rem 1rem; }
            .hero-cta { flex-direction: column; align-items: stretch; }
            .hero-cta .btn { justify-content: center; }
            .hero-trust { gap: 1.25rem; }
        }

        /* ===================================================================
           套餐卡片
        =================================================================== */
        .pricing-section { background: var(--color-bg); border-top: 1px solid var(--color-border); }
        .category-grid { display: grid; grid-template-columns: 1fr; gap: 1.25rem; max-width: 1200px; margin: 0 auto; }
        @media (min-width: 640px) { .category-grid { grid-template-columns: repeat(2, 1fr); } }
        @media (min-width: 1024px) { .category-grid { grid-template-columns: repeat(4, 1fr); } }
        .category-card {
            position: relative; background: var(--color-bg-card);
            border: 1px solid var(--color-border); border-radius: 1.25rem;
            padding: 2.25rem 1.75rem 1.75rem;
            display: flex; flex-direction: column; gap: 1.25rem;
            transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            text-decoration: none; color: inherit; overflow: hidden;
        }
        .category-card::before {
            content: ""; position: absolute; top: 0; left: 0; right: 0;
            height: 4px; background: var(--color-border);
        }
        .category-card:hover { transform: translateY(-3px); }
        .category-head { display: flex; flex-direction: column; gap: 0.25rem; }
        .category-logo {
            width: 44px; height: 44px; border-radius: 0.75rem; background: var(--color-bg-elev);
            display: inline-flex; align-items: center; justify-content: center;
            margin-bottom: 0.5rem; transition: all 0.25s;
        }
        .category-logo svg { width: 24px; height: 24px; color: var(--color-text); }

        /* 品牌色 */
        .category-card--chatgpt::before { background: #10A37F; }
        .category-card--chatgpt:hover { border-color: #10A37F; box-shadow: 0 12px 32px rgba(16, 163, 127, 0.16); }
        .category-card--chatgpt .category-logo { background: rgba(16, 163, 127, 0.1); }
        .category-card--chatgpt .category-logo svg,
        .category-card--chatgpt .category-eyebrow,
        .category-card--chatgpt .category-link { color: #10A37F; }
        .category-card--chatgpt .category-feats li::before { border-color: #10A37F !important; }

        .category-card--gemini::before { background: linear-gradient(90deg, #3186FF 0%, #08B962 33%, #FABC12 66%, #F94543 100%); }
        .category-card--gemini:hover { border-color: #3186FF; box-shadow: 0 12px 32px rgba(49, 134, 255, 0.18); }
        .category-card--gemini .category-logo { background: rgba(49, 134, 255, 0.08); }
        .category-card--gemini .category-eyebrow {
            background: linear-gradient(90deg, #3186FF, #F94543);
            -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; font-weight: 700;
        }
        .category-card--gemini .category-feats li::before { border-color: #3186FF !important; }
        .category-card--gemini .category-link { color: #3186FF; }

        .category-card--grok::before { background: var(--color-text); }
        .category-card--grok:hover { border-color: var(--color-text); box-shadow: var(--shadow-lg); }
        .category-card--grok .category-logo svg { color: var(--color-text); }
        .category-card--grok .category-eyebrow { color: var(--color-text); }
        
        .category-card--grok .category-feats li::before { border-color: var(--color-text) !important; }
        .category-card--grok .category-link { color: var(--color-text); }

        .category-card--claude::before { background: #D97757; }
        .category-card--claude:hover { border-color: #D97757; box-shadow: 0 12px 32px rgba(217, 119, 87, 0.22); }
        .category-card--claude .category-logo { background: rgba(217, 119, 87, 0.12); }
        .category-card--claude .category-logo svg,
        .category-card--claude .category-eyebrow,
        .category-card--claude .category-link { color: #D97757; }
        .category-card--claude .category-feats li::before { border-color: #D97757 !important; }

        .category-eyebrow {
            font-family: var(--font-mono); font-size: 0.7rem; font-weight: 600;
            color: var(--color-text-soft); text-transform: uppercase; letter-spacing: 0.1em;
        }
        .category-name {
            font-family: var(--font-display); font-size: 1.5rem; font-weight: 700;
            color: var(--color-text); letter-spacing: -0.02em; line-height: 1.1; margin-bottom: 0.25rem;
        }
        .category-variants { font-size: 0.85rem; color: var(--color-text-muted); line-height: 1.4; }
        .category-price {
            display: flex; align-items: baseline; gap: 0.2rem; padding: 0.75rem 0;
            border-top: 1px solid var(--color-border); border-bottom: 1px solid var(--color-border);
        }
        .category-currency { font-family: var(--font-mono); font-size: 1rem; color: var(--color-text-muted); }
        .category-amount {
            font-family: var(--font-mono); font-size: 2.5rem; font-weight: 700; color: var(--color-text);
            line-height: 1; letter-spacing: -0.03em; font-variant-numeric: tabular-nums;
        }
        .category-from { font-size: 0.95rem; color: var(--color-text-muted); margin-left: 0.25rem; }
        .category-feats {
            display: flex; flex-direction: column; gap: 0.5rem; font-size: 0.875rem;
            color: var(--color-text-muted); flex: 1; list-style: none; padding: 0;
        }
        .category-feats li { position: relative; padding-left: 1.1rem; line-height: 1.5; }
        .category-feats li::before {
            content: ""; position: absolute; left: 0; top: 0.5rem; width: 0.5rem; height: 0.3rem;
            border-left: 1.5px solid var(--color-accent); border-bottom: 1.5px solid var(--color-accent);
            transform: rotate(-45deg);
        }
        .category-link {
            display: inline-flex; align-items: center; gap: 0.375rem; font-size: 0.9rem;
            font-weight: 600; color: var(--color-accent); margin-top: 0.5rem; transition: gap 0.2s;
        }
        .category-card:hover .category-link { gap: 0.625rem; }

        /* ===================================================================
           服务说明（GEO 引言段）
        =================================================================== */
        .geo-intro { background: var(--color-bg); padding: var(--section-y) 1.5rem; border-top: 1px solid var(--color-border); }
        .geo-intro-inner { max-width: 660px; margin: 0 auto; text-align: center; }
        .geo-intro-eyebrow {
            font-family: var(--font-serif); font-style: italic; font-size: 0.95rem;
            color: var(--color-text-soft); margin-bottom: 1.25rem; display: inline-block;
        }
        .geo-intro-eyebrow::before, .geo-intro-eyebrow::after { content: "·"; margin: 0 0.6rem; color: var(--color-border-strong); }
        .geo-intro-question {
            font-family: var(--font-serif); font-style: italic; font-weight: 400;
            font-size: clamp(1.5rem, 2.6vw, 1.85rem); line-height: 1.35;
            color: var(--color-text); margin-bottom: 2.25rem;
        }
        .geo-intro-divider { width: 36px; height: 1px; background: var(--color-border-strong); margin: 0 auto 2.25rem; border: none; }
        .geo-intro-body {
            font-family: var(--font-body); font-size: 1.05rem; line-height: 1.85;
            color: var(--color-text-muted); text-align: left;
        }
        .geo-intro-body strong { color: var(--color-text); font-weight: 600; }
        .geo-intro-coda {
            margin-top: 2rem; font-family: var(--font-serif); font-style: italic;
            font-size: 0.98rem; color: var(--color-text-soft); text-align: center;
        }
        .geo-intro-coda-mark { margin-right: 0.5rem; color: var(--color-border-strong); font-style: normal; }
        @media (max-width: 720px) { .geo-intro-body { font-size: 0.98rem; line-height: 1.78; } }

        /* ===================================================================
           为什么选择我们
        =================================================================== */
        .features-section { background: var(--color-bg); border-top: 1px solid var(--color-border); }
        .features-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 1.25rem; }
        .feature-card {
            padding: 2rem; background: var(--color-bg-card); border: 1px solid var(--color-border);
            border-radius: 1rem; transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .feature-card:hover { border-color: var(--color-text); transform: translateY(-2px); box-shadow: var(--shadow-md); }
        .feature-icon {
            width: 44px; height: 44px; border-radius: 0.625rem;
            background: var(--color-accent-soft); color: var(--color-accent);
            display: inline-flex; align-items: center; justify-content: center; margin-bottom: 1.25rem;
        }
        .feature-icon svg { width: 22px; height: 22px; }
        .feature-title {
            font-family: var(--font-display); font-size: 1.1rem; font-weight: 700;
            margin-bottom: 0.5rem; color: var(--color-text); letter-spacing: -0.01em;
        }
        .feature-desc { font-size: 0.9rem; color: var(--color-text-muted); line-height: 1.6; }

        /* ===================================================================
           用户评价
        =================================================================== */
        .reviews-section { background: var(--color-bg); border-top: 1px solid var(--color-border); }
        /* 满意度 / 续费率 数字高亮 */
        .review-stats {
            display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem;
            max-width: 760px; margin: 0 auto 3rem;
        }
        @media (max-width: 600px) { .review-stats { gap: 0.5rem; } }
        .review-stat {
            text-align: center; padding: 1.5rem 0.75rem;
            background: var(--color-bg-card); border: 1px solid var(--color-border); border-radius: 1rem;
        }
        .review-stat-num {
            font-family: var(--font-mono); font-size: clamp(1.75rem, 5vw, 2.75rem); font-weight: 700;
            color: var(--color-accent); line-height: 1; letter-spacing: -0.02em;
        }
        .review-stat-label { font-size: 0.85rem; color: var(--color-text-muted); margin-top: 0.5rem; }
        .reviews-grid {
            display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 1.5rem; max-width: 1100px; margin: 0 auto;
        }
        .review-card {
            background: var(--color-bg-card); border: 1px solid var(--color-border);
            border-radius: 1rem; padding: 1.75rem; margin: 0;
            transition: all 0.3s ease; box-shadow: var(--shadow-sm);
            display: flex; flex-direction: column; gap: 1rem;
        }
        .review-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
        .review-stars { color: #F59E0B; font-size: 1rem; letter-spacing: 0.1em; }
        .review-text { font-size: 0.95rem; color: var(--color-text); line-height: 1.65; }
        .review-author {
            display: flex; align-items: center; gap: 0.75rem; margin-top: auto;
            padding-top: 0.75rem; border-top: 1px solid var(--color-border);
        }
        .review-avatar {
            width: 38px; height: 38px; border-radius: 50%; flex-shrink: 0;
            background: var(--color-accent-soft); color: var(--color-accent);
            display: flex; align-items: center; justify-content: center;
            font-family: var(--font-display); font-weight: 700; font-size: 0.95rem;
        }
        .review-name { font-size: 0.875rem; font-weight: 600; color: var(--color-text); }
        .review-meta { font-size: 0.78rem; color: var(--color-text-soft); }
        /* 截图卡片 */
        .review-card--img { padding: 0.75rem; }
        .review-card--img img { width: 100%; height: auto; border-radius: 0.625rem; display: block; }
        .review-card-missing { display: none; }
        /* 图片缺失时显示的占位提示 */
        .review-card--img.img-missing img { display: none; }
        .review-card--img.img-missing {
            aspect-ratio: 9 / 16; max-height: 420px;
            border: 2px dashed var(--color-border-strong);
            display: flex; align-items: center; justify-content: center; text-align: center;
        }
        .review-card--img.img-missing .review-card-missing {
            display: block; color: var(--color-text-soft); font-size: 0.95rem; font-weight: 600; line-height: 1.6;
        }
        .review-card-missing small { font-weight: 400; font-size: 0.78rem; }

        /* ===================================================================
           使用流程 + 客服
        =================================================================== */
        .trust-section { background: var(--color-bg); border-top: 1px solid var(--color-border); }
        .trust-layout { display: grid; grid-template-columns: 1fr; gap: 3rem; align-items: start; }
        @media (min-width: 900px) { .trust-layout { grid-template-columns: 1.4fr 1fr; gap: 4rem; } }
        .trust-main .section-title { text-align: left; }
        .trust-main .section-eyebrow { margin-bottom: 0.75rem; }
        .trust-steps { display: flex; flex-direction: column; gap: 1.5rem; margin-top: 2.5rem; margin-bottom: 2rem; }
        .trust-step { display: flex; gap: 1.25rem; align-items: flex-start; }
        .trust-step-num {
            font-size: 1.5rem; font-weight: 700; color: var(--color-text); opacity: 0.4;
            line-height: 1; flex-shrink: 0; min-width: 2.5rem;
        }
        .trust-step-title {
            font-family: var(--font-display); font-size: 1.05rem; font-weight: 700;
            color: var(--color-text); margin-bottom: 0.375rem; letter-spacing: -0.01em;
        }
        .trust-step-desc { color: var(--color-text-muted); font-size: 0.9rem; line-height: 1.6; }
        .trust-promises {
            display: flex; flex-wrap: wrap; gap: 0.75rem 1.25rem;
            padding-top: 1.5rem; border-top: 1px solid var(--color-border);
        }
        .trust-promise { display: inline-flex; align-items: center; gap: 0.5rem; font-size: 0.875rem; color: var(--color-text-muted); }
        .trust-promise svg { color: var(--color-success); }
        .contact-card {
            padding: 2rem; background: var(--color-bg-card);
            border: 1px solid var(--color-border); border-radius: 1rem;
        }
        .contact-card-eyebrow {
            display: inline-block; font-size: 0.8rem; font-weight: 600; color: var(--color-accent);
            letter-spacing: 0.02em; text-transform: uppercase; margin-bottom: 0.75rem;
        }
        .contact-card-title {
            font-family: var(--font-display); font-size: 1.5rem; font-weight: 700;
            margin-bottom: 0.5rem; color: var(--color-text); letter-spacing: -0.015em;
        }
        .contact-card-desc { color: var(--color-text-muted); font-size: 0.9rem; line-height: 1.6; margin-bottom: 1.5rem; }
        .contact-wechat-row { display: flex; gap: 0.5rem; align-items: center; margin-bottom: 0.75rem; flex-wrap: wrap; }
        .contact-wechat-id {
            flex: 1; min-width: 0; font-family: var(--font-mono); font-size: 0.95rem;
            background: var(--color-bg-elev); border: 1px solid var(--color-border);
            padding: 0.5rem 0.75rem; border-radius: 0.5rem; color: var(--color-text);
            overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
        }
        .contact-copy-btn { flex-shrink: 0; padding: 0.5rem 1rem; font-size: 0.85rem; }
        .contact-card-tip { font-size: 0.8rem; color: var(--color-text-soft); }

        /* 发票服务 + 代理价（trust 区底部） */
        .trust-extras {
            display: grid; grid-template-columns: 1fr; gap: 1.25rem; margin-top: 3rem;
        }
        @media (min-width: 700px) { .trust-extras { grid-template-columns: 1.3fr 1fr; } }
        .extra-card {
            display: flex; align-items: center; gap: 1rem;
            padding: 1.5rem 1.75rem; border-radius: 1rem;
            border: 1px solid var(--color-border); background: var(--color-bg-card);
        }
        .extra-card-icon {
            width: 44px; height: 44px; flex-shrink: 0; border-radius: 0.625rem;
            display: inline-flex; align-items: center; justify-content: center;
            background: var(--color-accent-soft); color: var(--color-accent);
        }
        .extra-card-icon svg { width: 22px; height: 22px; }
        .extra-card-title {
            font-family: var(--font-display); font-size: 1rem; font-weight: 700;
            color: var(--color-text); margin-bottom: 0.2rem;
        }
        .extra-card-desc { font-size: 0.85rem; color: var(--color-text-muted); line-height: 1.5; }
        .extra-card-desc .num { font-weight: 700; color: var(--color-text); }
        .extra-card--reseller { cursor: pointer; transition: border-color 0.2s, transform 0.2s; text-decoration: none; }
        .extra-card--reseller:hover { border-color: var(--color-text); transform: translateY(-2px); }

        /* ===================================================================
           官方背书（证明截图位）
        =================================================================== */
        .proof-section { background: var(--color-bg-elev); border-top: 1px solid var(--color-border); padding-top: 3.5rem; padding-bottom: 5rem; }
        .proof-layout {
            display: grid; grid-template-columns: 1fr; gap: 3rem; align-items: center; max-width: 1180px; margin: 0 auto;
        }
        @media (min-width: 900px) { .proof-layout { grid-template-columns: 1fr 1.15fr; gap: 4rem; } }
        .proof-text .section-eyebrow { margin-bottom: 0.9rem; font-size: 1.1rem; }
        .proof-text .section-title { text-align: left; font-size: clamp(1.9rem, 3.6vw, 2.75rem); }
        .proof-text p { color: var(--color-text-muted); font-size: 1.075rem; line-height: 1.75; margin-top: 1.1rem; }
        .proof-figure { margin: 0; }
        .proof-figure img {
            width: 100%; height: auto; display: block;
            border-radius: 1rem; border: 1px solid var(--color-border); box-shadow: var(--shadow-md);
        }
        /* 还没有截图时的占位框 */
        .proof-placeholder {
            aspect-ratio: 4 / 3; border-radius: 1rem;
            border: 2px dashed var(--color-border-strong); background: var(--color-bg-card);
            display: flex; flex-direction: column; align-items: center; justify-content: center;
            gap: 0.5rem; color: var(--color-text-soft); text-align: center; padding: 1.5rem;
        }
        .proof-placeholder svg { width: 40px; height: 40px; opacity: 0.5; }
        .proof-placeholder span { font-size: 0.85rem; }

        /* ===================================================================
           页脚
        =================================================================== */
        .footer-main { background: var(--footer-bg); color: #A1A1AA; padding: 4rem 1.5rem 0; }
        .footer-inner {
            max-width: 1200px; margin: 0 auto; display: grid;
            grid-template-columns: 1fr; gap: 3rem; padding-bottom: 3rem;
        }
        @media (min-width: 768px) { .footer-inner { grid-template-columns: 1.4fr 2.6fr; gap: 4rem; } }
        .footer-logo {
            display: inline-flex; align-items: center; gap: 0.5rem;
            font-family: var(--font-display); font-weight: 700; font-size: 1.25rem;
            color: #FFFFFF; text-decoration: none; margin-bottom: 0.75rem;
        }
        .footer-logo svg { width: 22px; height: 22px; color: var(--color-accent); }
        .footer-tagline { font-size: 0.9rem; color: #71717A; line-height: 1.6; }
        .footer-cols { display: grid; grid-template-columns: repeat(2, 1fr); gap: 2rem; }
        @media (min-width: 600px) { .footer-cols { grid-template-columns: repeat(4, 1fr); } }
        .footer-col { display: flex; flex-direction: column; gap: 0.75rem; }
        .footer-col-title { color: #FFFFFF; font-size: 0.85rem; font-weight: 600; margin-bottom: 0.25rem; }
        .footer-col a { color: #A1A1AA; text-decoration: none; font-size: 0.875rem; transition: color 0.15s; }
        .footer-col a:hover { color: #FFFFFF; }
        .footer-contact-static { font-size: 0.85rem; color: #71717A; }
        .footer-wechat {
            font-family: var(--font-mono); font-size: 0.8rem; color: #FFFFFF;
            background: #1F1F23; padding: 0.25rem 0.5rem; border-radius: 0.375rem; word-break: break-all;
        }
        .footer-bottom { border-top: 1px solid #1F1F23; padding: 1.5rem 0; }
        .footer-bottom-inner { max-width: 1200px; margin: 0 auto; font-size: 0.8rem; color: #52525B; text-align: center; }

        /* ===================================================================
           悬浮客服按钮 + Toast
        =================================================================== */
        .floating-cs {
            position: fixed; bottom: 1.5rem; right: 1.5rem; z-index: 40;
            width: 48px; height: 48px; border-radius: 50%;
            background: var(--color-text); color: var(--color-bg);
            border: none; cursor: pointer; display: flex; align-items: center; justify-content: center;
            box-shadow: var(--shadow-lg); transition: transform 0.2s, background 0.2s;
        }
        .floating-cs svg { width: 22px; height: 22px; }
        .floating-cs:hover { background: var(--color-accent); color: #fff; transform: scale(1.05); }
        .bookmark-prompt {
            display: none;
            position: fixed; right: 1.5rem; bottom: calc(1.5rem + 48px + 0.75rem); z-index: 45;
            width: 280px; max-width: calc(100vw - 3rem);
            background: var(--color-bg-card); border: 1px solid var(--color-border);
            border-radius: 1rem; box-shadow: var(--shadow-lg);
            padding: 0.9rem 1.1rem; gap: 0.7rem;
        }
        .bookmark-prompt.is-visible { display: flex; align-items: flex-start; animation: bookmark-prompt-in 0.4s cubic-bezier(0.2,0.8,0.2,1); }
        @keyframes bookmark-prompt-in {
            from { opacity: 0; transform: translateY(14px) scale(0.96); }
            to { opacity: 1; transform: translateY(0) scale(1); }
        }
        .bookmark-prompt-close {
            position: absolute; top: 0.35rem; right: 0.5rem;
            width: 22px; height: 22px; border: none; background: transparent; color: var(--color-text-soft);
            font-size: 1.15rem; line-height: 1; cursor: pointer; border-radius: 50%; padding: 0;
        }
        .bookmark-prompt-close:hover { background: var(--color-bg-elev); color: var(--color-text); }
        .bookmark-prompt-icon {
            flex: none; width: 34px; height: 34px; border-radius: 50%; margin-top: 0.1rem;
            background: var(--color-accent-soft); color: var(--color-accent);
            display: flex; align-items: center; justify-content: center;
        }
        .bookmark-prompt-body { flex: 1; min-width: 0; padding-right: 1rem; }
        .bookmark-prompt-title { font-weight: 700; font-size: 0.92rem; margin: 0 0 0.2rem; color: var(--color-text); }
        .bookmark-prompt-desc { font-size: 0.8rem; color: var(--color-text-soft); margin: 0 0 0.6rem; line-height: 1.4; }
        .bookmark-prompt-btn {
            width: 100%; background: var(--color-accent); color: #fff; border: none; border-radius: 0.5rem;
            padding: 0.5rem 0.9rem; font-size: 0.85rem; font-weight: 600; cursor: pointer;
            transition: background 0.15s;
        }
        .bookmark-prompt-btn:hover { background: var(--color-accent-hover); }
        @media (max-width: 480px) {
            /* .floating-cs 的 bottom/right 在所有断点下都是 1.5rem，这里只需收窄卡片宽度，垂直位置沿用基础规则的 calc() */
            .bookmark-prompt { left: 1rem; right: 1rem; width: auto; }
        }
        @media (prefers-reduced-motion: reduce) {
            .bookmark-prompt.is-visible { animation: none; }
        }
        .toast {
            position: fixed; top: 5rem; left: 50%; transform: translateX(-50%);
            background: var(--color-success); color: #fff; padding: 0.75rem 1.5rem;
            border-radius: 0.5rem; box-shadow: var(--shadow-lg); z-index: 60;
            font-size: 0.9rem; transition: opacity 0.3s;
        }

        /* ===================================================================
           子页：页头 + 多档套餐（独立 AI 详情页）
        =================================================================== */
        .nav-links a.is-active { color: var(--color-text); font-weight: 700; }

        .page-header {
            position: relative; padding: 5rem 1.5rem 3.5rem; text-align: center;
            background: var(--color-bg); overflow: hidden; border-bottom: 1px solid var(--color-border);
        }
        .page-header .hero-grid { position: absolute; inset: 0; opacity: 0.4; pointer-events: none; }
        .page-header-inner { max-width: 760px; margin: 0 auto; position: relative; z-index: 1; }
        .page-header-logo {
            width: 64px; height: 64px; border-radius: 1rem; margin: 0 auto 1.25rem;
            display: flex; align-items: center; justify-content: center; background: var(--color-bg-elev);
        }
        .page-header-logo svg { width: 36px; height: 36px; color: var(--color-text); }
        .page-header-eyebrow {
            font-family: var(--font-mono); font-size: 0.75rem; font-weight: 600;
            text-transform: uppercase; letter-spacing: 0.12em; color: var(--color-accent); margin-bottom: 0.75rem;
        }
        .page-header h1 {
            font-family: var(--font-serif); font-weight: 400; font-variation-settings: "opsz" 96;
            font-size: clamp(2.25rem, 5vw, 3.5rem); line-height: 1.1; letter-spacing: -0.02em; margin-bottom: 1rem;
        }
        .page-header p { color: var(--color-text-muted); font-size: 1.05rem; line-height: 1.6; max-width: 560px; margin: 0 auto; }
        .breadcrumb {
            font-size: 0.85rem; color: var(--color-text-soft); margin-bottom: 2rem;
            display: flex; gap: 0.5rem; justify-content: center; align-items: center;
        }
        .breadcrumb a { color: var(--color-text-soft); text-decoration: none; }
        .breadcrumb a:hover { color: var(--color-text); }
        .breadcrumb span { color: var(--color-border-strong); }

        /* 套餐档位卡片网格 */
        .pkg-grid {
            display: grid; grid-template-columns: 1fr; gap: 1.25rem; max-width: 1100px; margin: 0 auto;
        }
        @media (min-width: 640px) { .pkg-grid { grid-template-columns: repeat(2, 1fr); } }
        @media (min-width: 980px) { .pkg-grid { grid-template-columns: repeat(3, 1fr); } }
        .pkg-card {
            position: relative; display: flex; flex-direction: column;
            background: var(--color-bg-card); border: 1px solid var(--color-border);
            border-radius: 1.25rem; padding: 1.75rem; transition: all 0.25s cubic-bezier(0.4,0,0.2,1);
        }
        .pkg-card:hover { transform: translateY(-3px); border-color: var(--color-border-strong); box-shadow: var(--shadow-md); }
        .pkg-card--featured { border-color: var(--color-text); box-shadow: var(--shadow-md); }
        .pkg-badge {
            position: absolute; top: -0.7rem; left: 50%; transform: translateX(-50%);
            background: var(--color-text); color: var(--color-bg);
            font-size: 0.72rem; font-weight: 700; padding: 0.25rem 0.85rem; border-radius: 999px; white-space: nowrap;
        }
        .pkg-name {
            font-family: var(--font-display); font-size: 1.2rem; font-weight: 700;
            color: var(--color-text); margin-bottom: 0.25rem; letter-spacing: -0.01em;
        }
        .pkg-tagline { font-size: 0.85rem; color: var(--color-text-soft); margin-bottom: 1.25rem; }
        .pkg-price { display: flex; align-items: baseline; gap: 0.25rem; margin-bottom: 0.25rem; }
        .pkg-price-cur { font-family: var(--font-mono); font-size: 1.1rem; color: var(--color-text-muted); }
        .pkg-price-num {
            font-family: var(--font-mono); font-size: 2.5rem; font-weight: 700; color: var(--color-text);
            line-height: 1; letter-spacing: -0.03em; font-variant-numeric: tabular-nums;
        }
        .pkg-price-unit { font-size: 0.9rem; color: var(--color-text-muted); }
        .pkg-price-old {
            font-family: var(--font-mono); font-size: 0.9rem; color: var(--color-text-soft);
            text-decoration: line-through; margin-bottom: 1.25rem; display: inline-block;
        }
        .pkg-feats {
            list-style: none; padding: 0; margin: 1.25rem 0; display: flex; flex-direction: column; gap: 0.6rem;
            font-size: 0.875rem; color: var(--color-text-muted); flex: 1;
            border-top: 1px solid var(--color-border); padding-top: 1.25rem;
        }
        .pkg-feats li { position: relative; padding-left: 1.4rem; line-height: 1.5; }
        .pkg-feats li::before {
            content: ""; position: absolute; left: 0; top: 0.4rem; width: 0.5rem; height: 0.3rem;
            border-left: 1.6px solid var(--color-success); border-bottom: 1.6px solid var(--color-success); transform: rotate(-45deg);
        }
        .pkg-card .btn { width: 100%; justify-content: center; margin-top: 0.5rem; }

        /* 子页：常见问题（简单列表） */
        .qa-list { max-width: 760px; margin: 0 auto; display: flex; flex-direction: column; gap: 1rem; }
        .qa-item { background: var(--color-bg-card); border: 1px solid var(--color-border); border-radius: 1rem; padding: 1.5rem 1.75rem; }
        .qa-q { font-family: var(--font-display); font-size: 1rem; font-weight: 700; color: var(--color-text); margin-bottom: 0.5rem; }
        .qa-a { font-size: 0.92rem; color: var(--color-text-muted); line-height: 1.65; }

        /* 子页：还有这些（交叉链接） */
        .more-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 1rem; max-width: 1100px; margin: 0 auto; }
        .more-card {
            display: block; text-decoration: none; padding: 1.5rem;
            background: var(--color-bg-card); border: 1px solid var(--color-border); border-radius: 1rem;
            transition: all 0.25s cubic-bezier(0.4,0,0.2,1);
        }
        .more-card:hover { transform: translateY(-3px); border-color: var(--color-text); box-shadow: var(--shadow-md); }
        .more-card-name { font-family: var(--font-display); font-size: 1.05rem; font-weight: 700; color: var(--color-text); margin-bottom: 0.25rem; }
        .more-card-desc { font-size: 0.85rem; color: var(--color-text-muted); line-height: 1.5; margin-bottom: 0.75rem; }
        .more-card-link { font-size: 0.85rem; font-weight: 600; color: var(--color-accent); }
        /* 子页 hero 标签行 */
        .sub-hero-tags { font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--color-accent); margin-bottom: 1.25rem; }
        .pkg-note { text-align: center; font-size: 0.85rem; color: var(--color-text-soft); margin-top: 1.75rem; }

        /* 导航 Logo：品牌名 + 副标题（两行） */
        .nav-logo-text { display: inline-flex; flex-direction: column; line-height: 1.1; }
        .nav-logo-name { font-family: var(--font-display); font-weight: 700; font-size: 1.1rem; letter-spacing: -0.01em; color: var(--color-text); }
        .nav-logo-sub { font-size: 0.7rem; font-weight: 500; color: var(--color-text-soft); letter-spacing: 0.02em; margin-top: 1px; }
        @media (max-width: 768px) { .nav-logo-sub { display: none; } }

        /* 页脚 Logo：品牌名 + 副标题（两行） */
        .footer-logo-text { display: inline-flex; flex-direction: column; line-height: 1.15; }
        .footer-logo-sub { font-size: 0.72rem; font-weight: 500; color: #71717A; letter-spacing: 0.02em; margin-top: 1px; }

        /* 导航 AI 链接：品牌图标 + 文字 */
        .nav-ai { display: inline-flex; align-items: center; gap: 0.4rem; }
        .nav-ai-ico { display: inline-flex; flex-shrink: 0; }
        .nav-ai-ico svg { width: 18px; height: 18px; display: block; }
        .nav-ai--chatgpt .nav-ai-ico svg { color: #10A37F; }
        .nav-ai--claude .nav-ai-ico svg { color: #D97757; }
        .nav-ai--grok .nav-ai-ico svg { color: var(--color-text); }

        /* Hero 行内 AI 链接：明确可点击 */
        .hero-meta-link {
            color: var(--color-accent); font-weight: 700; text-decoration: none;
            border-bottom: 1.5px solid color-mix(in srgb, var(--color-accent) 45%, transparent);
            padding-bottom: 1px; transition: border-color 0.15s, background 0.15s; border-radius: 2px;
        }
        .hero-meta-link:hover {
            border-bottom-color: var(--color-accent);
            background: var(--color-accent-soft);
        }

/* ============================================================
   浅色高级科技风 · 全站皮肤覆盖（追加层，后定义优先）
============================================================ */
:root{
  --color-bg:#FBFBFD;
  --color-bg-card:#FFFFFF;
  --color-bg-elev:#F4F4F7;
  --color-text:#1D1D1F;
  --color-text-muted:#57575E;
  --color-text-soft:#86868B;
  --color-border:rgba(0,0,0,0.08);
  --color-border-strong:rgba(0,0,0,0.14);
  --color-accent:#4F46E5;
  --color-accent-hover:#4338CA;
  --color-accent-soft:#EEF0FF;
  --grad:linear-gradient(120deg,#7C3AED 0%,#2563EB 50%,#0891B2 100%);
  --shadow-sm:0 1px 3px rgba(0,0,0,.05);
  --shadow-md:0 12px 34px rgba(0,0,0,.09);
  --shadow-lg:0 26px 70px rgba(0,0,0,.13);
  --font-display:-apple-system,BlinkMacSystemFont,"SF Pro Display","Space Grotesk","Inter","PingFang SC","Source Han Sans CN",sans-serif;
  --font-body:-apple-system,BlinkMacSystemFont,"SF Pro Text","Inter","PingFang SC","Source Han Sans CN",sans-serif;
}
/* 极光背景 */
body{position:relative;background:var(--color-bg)}
body::before{content:"";position:fixed;inset:0;z-index:0;pointer-events:none;
  background:
    radial-gradient(55% 45% at 12% -5%,rgba(124,58,237,0.10),transparent 60%),
    radial-gradient(50% 40% at 100% 0%,rgba(8,145,178,0.08),transparent 60%),
    radial-gradient(45% 45% at 50% 108%,rgba(37,99,235,0.07),transparent 60%);}
body>*{position:relative;z-index:1}

/* 渐变小标签 */
.section-eyebrow,.geo-intro-eyebrow{
  background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;color:transparent;font-weight:700;
}
/* Hero 标题：无衬线粗体 + 渐变强调 */
.hero-title{font-family:var(--font-display);font-weight:700;font-style:normal;letter-spacing:-.03em}
.hero-title-accent{font-family:var(--font-display);font-style:normal;font-weight:700;
  background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;color:transparent}

/* 渐变胶囊主按钮 */
.btn{border-radius:999px}
.btn-primary-new{background:var(--grad);color:#fff;border-radius:999px;box-shadow:0 8px 26px rgba(79,70,229,.28)}
.btn-primary-new:hover{background:var(--grad);color:#fff;filter:brightness(1.06);transform:translateY(-2px);box-shadow:0 14px 40px rgba(79,70,229,.42)}
.btn-secondary-new{border-radius:999px;background:rgba(255,255,255,.65);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px)}

/* 卡片：柔和阴影 + 更圆润 */
.card,.category-card,.feature-card,.pkg-card,.contact-card,.review-card,.review-stat,.extra-card,.more-card,.qa-item{
  border-radius:1.25rem;box-shadow:var(--shadow-sm);
}
.category-card:hover,.feature-card:hover,.pkg-card:hover,.more-card:hover,.extra-card--reseller:hover{box-shadow:var(--shadow-md)}

/* 数字渐变高亮 */
.review-stat-num{background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;color:transparent}

/* 导航更通透 */
.nav-main{background:rgba(255,255,255,.72)}

/* 页脚改浅色 */
.footer-main{background:rgba(0,0,0,.02);color:var(--color-text-muted);border-top:1px solid var(--color-border)}
.footer-logo,.footer-col-title{color:var(--color-text)}
.footer-tagline,.footer-contact-static,.footer-logo-sub,.footer-bottom-inner{color:var(--color-text-soft)}
.footer-col a{color:var(--color-text-muted)}
.footer-col a:hover{color:var(--color-text)}
.footer-wechat{color:var(--color-text);background:var(--color-bg-elev);border:1px solid var(--color-border)}
.footer-bottom{border-top:1px solid var(--color-border)}

/* ============================================================
   品牌文字徽标 Ai66.org（带底色，固定品牌渐变）
============================================================ */
.brand-badge{
  display:inline-flex;align-items:baseline;padding:.12rem .5rem;border-radius:.55rem;line-height:1.25;
  background:linear-gradient(135deg,rgba(124,58,237,.12),rgba(37,99,235,.09),rgba(8,145,178,.12));
  border:1px solid rgba(124,58,237,.18);
}
.brand-ai66{
  font-family:var(--font-display);font-weight:800;font-size:1.2rem;letter-spacing:-.01em;
  background:linear-gradient(135deg,#7C3AED 0%,#2563EB 50%,#0891B2 100%);
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;color:transparent;
}
.brand-org{font-weight:600;font-size:.82rem;color:var(--color-text-soft);margin-left:1px}
.footer-logo .brand-ai66{font-size:1.3rem}
/* 移动端仍显示徽标（覆盖旧的隐藏规则） */
@media (max-width:768px){
  .nav-logo .brand-badge{display:inline-flex}
  .nav-logo .brand-ai66,.nav-logo .brand-org{display:inline}
}

/* 子页能力区：每行 3 个，末行居中 */
#capabilities .features-grid{display:flex;flex-wrap:wrap;justify-content:center;gap:1.25rem}
#capabilities .feature-card{flex:1 1 30%;min-width:300px;max-width:373px}

.nav-logo-text,.footer-logo-text{align-items:center}

/* 子页导航 logo：AI 图标在左 */
.nav-logo-mark{display:inline-flex;align-items:center;flex-shrink:0}
.nav-logo-mark svg{display:block}
.nav-logo-text{align-items:center}

/* 移动端：提示导航可横向滑动（右侧渐隐） */
@media (max-width:768px){
  .nav-links{
    justify-content:flex-start;
    -webkit-mask-image:linear-gradient(to right,#000 78%,transparent 100%);
    mask-image:linear-gradient(to right,#000 78%,transparent 100%);
  }
}

/* 移动端导航右缘"可滑动"箭头指示 */
.nav-scroll-arrow{
  position:absolute; top:50%; transform:translateY(-50%);
  display:flex; align-items:center; justify-content:center;
  width:22px; height:22px; border-radius:50%;
  background:var(--color-bg-card); border:1px solid var(--color-border);
  color:var(--color-accent); font-weight:700; font-size:0.95rem; line-height:1;
  box-shadow:-8px 0 12px 2px var(--color-bg); z-index:3; pointer-events:none;
  transition:opacity .25s;
}

/* Grok eyebrow 保持 xAI 原样大小写 */
.category-card--grok .category-eyebrow{text-transform:none}

/* 首屏支付方式醒目提示 */
.hero-pay{
  display:inline-flex; align-items:center; gap:.55rem;
  margin:0 auto 1.75rem; padding:.6rem 1.2rem; border-radius:999px;
  background:linear-gradient(135deg,rgba(124,58,237,.10),rgba(37,99,235,.08),rgba(8,145,178,.10));
  border:1px solid rgba(124,58,237,.20);
  font-size:.98rem; color:var(--color-text); font-weight:600; box-shadow:var(--shadow-sm);
}
.hero-pay svg{ width:19px; height:19px; color:var(--color-accent); flex-shrink:0; }
.hero-pay strong{
  font-weight:800;
  background:linear-gradient(135deg,#7C3AED,#2563EB,#0891B2);
  -webkit-background-clip:text; background-clip:text; -webkit-text-fill-color:transparent;
}
@media (max-width:640px){ .hero-pay{ font-size:.9rem; padding:.5rem 1rem; } }