:root {
            --ink: #07111f;
            --muted: #4f6073;
            --soft: #f6f8fa;
            --line: #d9e1ea;
            --teal: #0f7c80;
            --teal-soft: #e8f5f3;
            --orange: #f47a18;
            --orange-soft: #fff2e8;
            --navy: #071827;
            --shadow: 0 18px 60px rgba(7, 17, 31, 0.10);
            color-scheme: light;
        }
        * { box-sizing: border-box; }
        html { scroll-behavior: smooth; }
        body {
            margin: 0;
            background: #ffffff;
            color: var(--ink);
            font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
            font-size: 15px;
            line-height: 1.55;
            letter-spacing: 0;
            -webkit-font-smoothing: antialiased;
            text-rendering: optimizeLegibility;
        }
        body.lang-zh {
            font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", ui-sans-serif, system-ui, sans-serif;
            line-height: 1.72;
        }
        body:not(.lang-zh) .i18n-zh,
        body.lang-en .i18n-zh,
        body.lang-zh .i18n-en,
        html.lang-en-root .i18n-zh,
        html.lang-zh-root .i18n-en { display: none !important; }
        a { color: inherit; }
        img { max-width: 100%; display: block; }
        .asset-picture { display: block; width: 100%; height: 100%; }
        .asset-picture img { width: 100%; height: 100%; object-fit: cover; }
        .page-shell {
            width: min(100% - 48px, 1480px);
            margin: 0 auto;
            border: 1px solid rgba(202, 211, 221, 0.92);
            border-radius: 8px;
            overflow: hidden;
            background: #fff;
            box-shadow: var(--shadow);
        }
        .site-nav {
            position: sticky;
            top: 0;
            z-index: 80;
            width: min(100% - 48px, 1480px);
            min-height: 64px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: minmax(220px, 1fr) minmax(0, auto) minmax(250px, 1fr);
            gap: 14px;
            align-items: center;
            padding: 10px 20px;
            border: 1px solid rgba(202, 211, 221, 0.92);
            border-bottom: 0;
            border-radius: 8px 8px 0 0;
            background: rgba(255, 255, 255, 0.96);
            box-shadow: 0 14px 44px rgba(7, 17, 31, 0.07);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
        }
        .brand-home {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            min-height: 44px;
            min-width: 0;
            text-decoration: none;
        }
        .site-logo { width: 42px; height: 42px; flex: 0 0 auto; }
        .brand-home b {
            display: block;
            font-size: 18px;
            line-height: 1.05;
            font-weight: 840;
        }
        .brand-home small {
            display: block;
            margin-top: 3px;
            color: var(--muted);
            font-size: 12px;
            line-height: 1.1;
            font-weight: 760;
        }
        .nav-center {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 20px;
            min-width: 0;
        }
        .nav-link {
            position: relative;
            display: inline-flex;
            align-items: center;
            min-height: 36px;
            color: #172033;
            text-decoration: none;
            font-size: 13px;
            font-weight: 780;
            white-space: nowrap;
        }
        .nav-link.active::after,
        .nav-link:hover::after {
            content: "";
            position: absolute;
            left: 0;
            right: 0;
            bottom: 2px;
            height: 2px;
            border-radius: 2px;
            background: var(--teal);
        }
        .nav-actions {
            display: flex;
            align-items: center;
            justify-content: flex-end;
            gap: 8px;
            min-width: 0;
        }
        .nav-lang,
        .nav-site-button {
            min-height: 40px;
            border: 1px solid var(--line);
            border-radius: 6px;
            background: #fff;
            color: var(--ink);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 6px;
            padding: 0 15px;
            text-decoration: none;
            font-size: 13px;
            font-weight: 800;
            white-space: nowrap;
            cursor: pointer;
        }
        .nav-site-button.research { border-color: rgba(15, 124, 128, 0.45); color: #0b666a; }
        .nav-site-button.travel { border-color: rgba(244, 122, 24, 0.48); color: #b74c08; }
        .language-dropdown { position: relative; }
        .language-menu {
            position: absolute;
            right: 0;
            top: calc(100% + 8px);
            min-width: 168px;
            padding: 7px;
            border: 1px solid var(--line);
            border-radius: 8px;
            background: #fff;
            box-shadow: 0 18px 44px rgba(7, 17, 31, 0.12);
            opacity: 0;
            transform: translateY(-4px);
            pointer-events: none;
            transition: opacity .18s ease, transform .18s ease;
        }
        .language-dropdown.is-open .language-menu {
            opacity: 1;
            transform: translateY(0);
            pointer-events: auto;
        }
        .language-option {
            width: 100%;
            min-height: 44px;
            border: 0;
            border-radius: 6px;
            background: transparent;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 14px;
            padding: 9px 10px;
            color: var(--ink);
            text-decoration: none;
            font: inherit;
            font-size: 13px;
            cursor: pointer;
        }
        .language-option.active,
        .language-option:hover { background: var(--soft); }
        .hero-banner {
            position: relative;
            min-height: 318px;
            display: grid;
            place-items: center;
            overflow: hidden;
            border-bottom: 1px solid var(--line);
            isolation: isolate;
        }
        .hero-banner .asset-picture {
            position: absolute;
            inset: 0;
            z-index: -2;
        }
        .hero-banner .asset-picture img { object-position: center 52%; }
        .hero-banner::after {
            content: "";
            position: absolute;
            inset: 0;
            z-index: -1;
            background:
                linear-gradient(90deg, rgba(255,255,255,.78), rgba(255,255,255,.25) 42%, rgba(255,255,255,.02) 70%),
                linear-gradient(180deg, rgba(255,255,255,.65), rgba(255,255,255,.12) 36%, rgba(255,255,255,.06));
        }
        .hero-copy {
            width: min(820px, calc(100% - 52px));
            margin: 0 auto;
            padding: 42px 0 46px;
            text-align: center;
        }
        .hero-copy .eyebrow {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            margin-bottom: 10px;
            color: #0a676c;
            font-size: 13px;
            font-weight: 830;
        }
        .hero-copy h1 {
            margin: 0;
            color: #07111f;
            font-size: 50px;
            line-height: 1.03;
            font-weight: 900;
        }
        .hero-copy h1 .zh-line {
            display: block;
            margin-top: 12px;
            font-size: 36px;
            line-height: 1.16;
            font-weight: 880;
        }
        body.lang-zh .hero-copy h1 {
            font-size: 44px;
            line-height: 1.12;
        }
        body.lang-zh .hero-copy h1 .en-kicker {
            display: block;
            margin-bottom: 9px;
            font-size: 30px;
            line-height: 1.08;
        }
        .hero-copy p {
            width: min(670px, 100%);
            margin: 16px auto 0;
            color: #172235;
            font-size: 17px;
            line-height: 1.55;
            font-weight: 600;
        }
        body.lang-zh .hero-copy p {
            width: min(680px, 100%);
            font-size: 17px;
            line-height: 1.78;
            font-weight: 620;
        }
        .product-row {
            display: grid;
            grid-template-columns: minmax(300px, 360px) minmax(0, 1fr);
            gap: clamp(30px, 4vw, 50px);
            align-items: center;
            padding: clamp(28px, 3.3vw, 46px) clamp(38px, 5vw, 70px);
            border-bottom: 1px solid var(--line);
            background: #fff;
        }
        .product-copy { min-width: 0; }
        .section-title {
            display: flex;
            align-items: center;
            gap: 12px;
            margin: 0 0 5px;
        }
        .section-title .business-svg-icon {
            width: 34px;
            height: 34px;
            flex: 0 0 auto;
        }
        .research-row .business-svg-icon,
        .qa-section .business-svg-icon,
        .news-section .business-svg-icon { color: var(--teal); }
        .travel-row .business-svg-icon { color: var(--orange); }
        .section-title h2 {
            margin: 0;
            font-size: 27px;
            line-height: 1.1;
            font-weight: 900;
        }
        .product-subtitle {
            margin: 0 0 16px 46px;
            color: #172235;
            font-size: 15px;
            line-height: 1.35;
            font-weight: 720;
        }
        .product-copy p {
            max-width: 34em;
            margin: 0 0 18px;
            color: #223249;
            font-size: 14px;
            line-height: 1.55;
            font-weight: 560;
        }
        body.lang-zh .product-copy p,
        body.lang-zh .product-subtitle {
            line-height: 1.76;
        }
        body.lang-zh .product-copy p { max-width: 31em; }
        .feature-list {
            display: grid;
            gap: 9px;
            margin: 0;
            padding: 0;
            list-style: none;
        }
        .feature-list li {
            display: grid;
            grid-template-columns: 18px minmax(0, 1fr);
            gap: 9px;
            align-items: start;
            color: #172235;
            font-size: 14px;
            font-weight: 720;
        }
        .feature-list b {
            width: 16px;
            height: 16px;
            margin-top: 2px;
            border-radius: 999px;
            display: grid;
            place-items: center;
            color: #fff;
            font-size: 10px;
            line-height: 1;
        }
        .research-row .feature-list b { background: var(--teal); }
        .travel-row .feature-list b { background: var(--orange); }
        .screenshot-frame {
            position: relative;
            overflow: hidden;
            border: 1px solid var(--line);
            border-radius: 8px;
            background: #fff;
            box-shadow: 0 12px 34px rgba(7, 17, 31, 0.08);
        }
        .research-shot-crop {
            aspect-ratio: 16 / 7.2;
        }
        .travel-shot-crop {
            aspect-ratio: 16 / 6.7;
        }
        .research-shot-crop .asset-picture img {
            object-position: center top;
        }
        .travel-shot-crop .asset-picture img { object-position: center top; }
        .matrix-language-shot { width: 100%; height: 100%; }
        body.lang-zh .matrix-language-shot.is-en,
        body:not(.lang-zh) .matrix-language-shot.is-zh { display: none; }
        .screenshot-label {
            position: absolute;
            left: 14px;
            bottom: 12px;
            padding: 5px 9px;
            border-radius: 6px;
            background: rgba(255, 255, 255, 0.88);
            color: #243247;
            font-size: 12px;
            font-weight: 820;
            box-shadow: 0 8px 22px rgba(7,17,31,.10);
        }
        .qa-section,
        .news-section {
            padding: clamp(28px, 3.3vw, 44px) clamp(38px, 5vw, 70px);
            border-bottom: 1px solid var(--line);
            background: #fff;
        }
        .section-heading {
            display: grid;
            grid-template-columns: minmax(0, 1fr) auto;
            gap: 20px;
            align-items: end;
            margin-bottom: 16px;
        }
        .section-heading p {
            max-width: 720px;
            margin: 6px 0 0 46px;
            color: var(--muted);
            font-weight: 610;
        }
        body.lang-zh .section-heading p {
            max-width: 780px;
            line-height: 1.78;
        }
        .section-action {
            min-height: 38px;
            border: 1px solid var(--line);
            border-radius: 6px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
            padding: 0 18px;
            color: #0a1727;
            text-decoration: none;
            font-size: 13px;
            font-weight: 820;
            white-space: nowrap;
        }
        .qa-grid {
            display: grid;
            grid-template-columns: repeat(2, minmax(0, 1fr));
            gap: 10px 16px;
        }
        .qa-grid details {
            border: 1px solid var(--line);
            border-radius: 6px;
            background: #fff;
            overflow: hidden;
        }
        .qa-grid summary {
            min-height: 44px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            padding: 0 16px;
            color: #132034;
            font-weight: 800;
            cursor: pointer;
            list-style: none;
        }
        .qa-grid summary::-webkit-details-marker { display: none; }
        .qa-grid summary::after {
            content: "+";
            color: var(--teal);
            font-size: 18px;
            line-height: 1;
            font-weight: 700;
        }
        .qa-grid details[open] summary::after { content: "-"; }
        .qa-grid p {
            margin: 0;
            padding: 0 16px 14px;
            color: var(--muted);
            font-size: 14px;
            font-weight: 560;
        }
        .daily-board {
            display: grid;
            grid-template-columns: repeat(3, minmax(0, 1fr));
            gap: clamp(14px, 2vw, 22px);
        }
        .daily-card {
            border: 1px solid var(--line);
            border-radius: 8px;
            overflow: hidden;
            background: #fff;
        }
        .daily-card h3 {
            margin: 0;
            padding: 10px 14px;
            border-bottom: 1px solid var(--line);
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 10px;
            font-size: 16px;
            line-height: 1.1;
        }
        .daily-card h3 span:first-child { font-weight: 900; }
        .daily-card h3 a {
            color: var(--teal);
            font-size: 12px;
            text-decoration: none;
            font-weight: 800;
        }
        .daily-card.ai h3 { color: #194ed6; }
        .daily-card.technology h3 { color: #07863c; }
        .daily-card.musk h3 { color: #d95d00; }
        .updates-main-feed {
            display: grid;
            gap: 0;
        }
        .update-text-row,
        .update-skeleton-card {
            display: grid;
            gap: 2px;
            min-height: 52px;
            padding: 8px 14px;
            border-bottom: 1px solid #edf1f5;
            text-decoration: none;
            color: var(--ink);
        }
        .update-text-row:last-child,
        .update-skeleton-card:last-child { border-bottom: 0; }
        .item-meta {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            color: var(--muted);
            font-size: 11px;
            font-weight: 760;
        }
        .item-tag { display: none; }
        .item-title {
            margin: 0;
            overflow: hidden;
            color: #132034;
            font-size: 13px;
            line-height: 1.25;
            font-weight: 800;
            text-overflow: ellipsis;
            white-space: nowrap;
        }
        .item-desc { display: none; }
        .updates-placeholder {
            margin: 0;
            padding: 18px 14px;
            color: var(--muted);
            font-size: 13px;
            font-weight: 620;
        }
        .update-skeleton-line {
            display: block;
            height: 9px;
            border-radius: 9px;
            background: linear-gradient(90deg, #eef3f7, #f7fafc, #eef3f7);
        }
        .update-skeleton-line.short { width: 30%; }
        .update-skeleton-line.medium { width: 55%; }
        .update-skeleton-line.long { width: 84%; }
        .site-footer {
            display: grid;
            grid-template-columns: minmax(220px, 1.05fr) minmax(160px, .75fr) minmax(220px, 1fr) minmax(210px, .86fr) minmax(150px, .7fr);
            gap: clamp(22px, 2.5vw, 34px);
            padding: 30px clamp(38px, 5vw, 70px) 18px;
            background: radial-gradient(circle at 16% 20%, rgba(18,80,96,.42), transparent 36%), var(--navy);
            color: #e8f1f6;
        }
        .footer-brand {
            display: grid;
            gap: 12px;
        }
        .footer-brand-row {
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .footer-brand-row .site-logo { background: rgba(255,255,255,.94); border-radius: 999px; }
        .footer-brand b {
            display: block;
            font-size: 18px;
            line-height: 1.08;
            font-weight: 880;
        }
        .footer-brand small,
        .footer-brand p,
        .footer-col span,
        .footer-bottom {
            color: rgba(232, 241, 246, 0.76);
        }
        .footer-brand p {
            margin: 0;
            font-size: 13px;
            line-height: 1.5;
        }
        .footer-col {
            display: grid;
            align-content: start;
            gap: 8px;
            font-size: 13px;
        }
        .footer-col h3 {
            margin: 0 0 5px;
            color: #fff;
            font-size: 14px;
            font-weight: 860;
        }
        .footer-col a {
            color: #fff;
            text-decoration: none;
            font-weight: 660;
        }
        .footer-bottom {
            grid-column: 1 / -1;
            display: flex;
            justify-content: space-between;
            gap: 18px;
            padding-top: 14px;
            border-top: 1px solid rgba(255,255,255,.12);
            font-size: 12px;
        }
        .mobile-menu-glyph {
            display: none;
            width: 34px;
            height: 34px;
            border: 0;
            background: transparent;
            color: var(--ink);
            font-size: 23px;
            line-height: 1;
            cursor: pointer;
        }
        body[data-surface="mobile"] {
            background: #fff;
        }
        body[data-surface="mobile"] .site-nav {
            width: 100%;
            min-height: 49px;
            grid-template-columns: minmax(0, 1fr) auto;
            gap: 6px;
            padding: 8px 14px;
            border: 0;
            border-bottom: 1px solid var(--line);
            border-radius: 0;
            box-shadow: none;
        }
        body[data-surface="mobile"] .site-logo { width: 31px; height: 31px; }
        body[data-surface="mobile"] .brand-home {
            width: 196px;
            min-height: 44px;
        }
        body[data-surface="mobile"] .brand-home b { font-size: 14px; }
        body[data-surface="mobile"] .brand-home span { min-width: 0; }
        body[data-surface="mobile"] .brand-home b {
            max-width: 146px;
            overflow: hidden;
            text-overflow: ellipsis;
            white-space: nowrap;
        }
        body[data-surface="mobile"] .brand-home small { display: none; }
        body[data-surface="mobile"] .nav-center,
        body[data-surface="mobile"] .nav-site-button { display: none; }
        body[data-surface="mobile"] .nav-actions {
            position: fixed;
            right: max(8px, calc(100vw - 382px));
            top: 4px;
            z-index: 120;
            display: flex !important;
            gap: 2px;
            background: rgba(255, 255, 255, 0.92);
        }
        body[data-surface="mobile"] .nav-lang {
            min-height: 44px;
            padding: 0 9px;
            border: 0;
            font-size: 12px;
        }
        body[data-surface="mobile"] .mobile-menu-glyph {
            display: inline-grid;
            place-items: center;
            width: 44px;
            height: 44px;
        }
        body[data-surface="mobile"] .page-shell {
            width: 100%;
            border: 0;
            border-radius: 0;
            box-shadow: none;
        }
        body[data-surface="mobile"] .hero-banner {
            min-height: 252px;
            place-items: start;
            border-bottom: 1px solid var(--line);
        }
        body[data-surface="mobile"] .hero-banner .asset-picture img {
            object-position: center center;
            transform: scale(1.22) translateX(-54px);
            transform-origin: center center;
        }
        body[data-surface="mobile"] .hero-banner::after {
            background:
                linear-gradient(90deg, rgba(255,255,255,.88), rgba(255,255,255,.36) 66%, rgba(255,255,255,.04)),
                linear-gradient(180deg, rgba(255,255,255,.72), rgba(255,255,255,.10));
        }
        body[data-surface="mobile"] .hero-copy {
            width: 100%;
            margin: 0;
            padding: 30px 20px 20px;
            text-align: left;
        }
        body[data-surface="mobile"] .hero-copy .eyebrow { display: none; }
        body[data-surface="mobile"] .hero-copy h1,
        body[data-surface="mobile"].lang-zh .hero-copy h1 {
            width: 292px;
            max-width: calc(100vw - 40px);
            font-size: 27px;
            line-height: 1.14;
        }
        body[data-surface="mobile"] .hero-copy h1 .zh-line,
        body[data-surface="mobile"].lang-zh .hero-copy h1 .en-kicker {
            margin-top: 8px;
            font-size: 20px;
            line-height: 1.22;
        }
        body[data-surface="mobile"] .hero-copy p {
            width: 270px;
            max-width: calc(100vw - 40px);
            margin: 10px 0 0;
            font-size: 13px;
            line-height: 1.5;
            font-weight: 620;
        }
        body[data-surface="mobile"].lang-zh .hero-copy p {
            width: 282px;
            font-size: 13px;
            line-height: 1.62;
        }
        body[data-surface="mobile"] .product-row {
            grid-template-columns: 1fr;
            gap: 16px;
            padding: 26px 20px;
        }
        body[data-surface="mobile"] .section-title h2 { font-size: 21px; }
        body[data-surface="mobile"] .section-title .business-svg-icon {
            width: 25px;
            height: 25px;
        }
        body[data-surface="mobile"] .product-subtitle {
            margin-left: 37px;
            margin-bottom: 13px;
            font-size: 13px;
        }
        body[data-surface="mobile"] .product-copy p {
            font-size: 13px;
            line-height: 1.55;
            margin-bottom: 13px;
        }
        body[data-surface="mobile"] .feature-list { gap: 6px; }
        body[data-surface="mobile"] .feature-list li {
            font-size: 13px;
            grid-template-columns: 16px minmax(0, 1fr);
            gap: 8px;
        }
        body[data-surface="mobile"] .feature-list b {
            width: 15px;
            height: 15px;
            font-size: 9px;
        }
        body[data-surface="mobile"] .research-shot-crop,
        body[data-surface="mobile"] .travel-shot-crop {
            aspect-ratio: 16 / 8.2;
        }
        body[data-surface="mobile"] .qa-section,
        body[data-surface="mobile"] .news-section {
            padding: 24px 20px;
        }
        body[data-surface="mobile"] .section-heading {
            grid-template-columns: 1fr;
            gap: 10px;
            margin-bottom: 12px;
        }
        body[data-surface="mobile"] .section-heading p {
            margin-left: 37px;
            font-size: 13px;
        }
        body[data-surface="mobile"] .section-action { display: none; }
        body[data-surface="mobile"] .qa-grid,
        body[data-surface="mobile"] .daily-board {
            grid-template-columns: 1fr;
            gap: 10px;
        }
        body[data-surface="mobile"] .daily-card:not(:first-child) {
            display: block;
        }
        body[data-surface="mobile"] .daily-card h3 {
            min-height: 38px;
            padding: 9px 12px;
            font-size: 14px;
        }
        body[data-surface="mobile"] .update-text-row,
        body[data-surface="mobile"] .update-skeleton-card {
            min-height: 42px;
            padding: 7px 12px;
        }
        body[data-surface="mobile"] .item-title { font-size: 12px; }
        body[data-surface="mobile"] .site-footer {
            grid-template-columns: 1fr;
            gap: 18px;
            padding: 24px 20px 18px;
        }
        body[data-surface="mobile"] .footer-col { gap: 7px; }
        body[data-surface="mobile"] .footer-bottom {
            display: grid;
            gap: 8px;
        }
        @media (max-width: 1180px) {
            .site-nav {
                grid-template-columns: minmax(210px, 1fr) auto;
            }
            .nav-center { display: none; }
            .product-row {
                grid-template-columns: minmax(280px, 320px) minmax(0, 1fr);
                gap: 28px;
                padding-left: 42px;
                padding-right: 42px;
            }
            .qa-section,
            .news-section,
            .site-footer {
                padding-left: 42px;
                padding-right: 42px;
            }
            .site-footer {
                grid-template-columns: repeat(2, minmax(0, 1fr));
            }
        }
        @media (max-width: 860px) {
            body[data-surface="desktop"] .site-nav,
            body[data-surface="desktop"] .page-shell { width: min(100% - 24px, 520px); }
            body[data-surface="desktop"] .site-nav {
                grid-template-columns: minmax(0, 1fr) auto;
                border-bottom: 1px solid var(--line);
            }
            body[data-surface="desktop"] .nav-site-button { display: none; }
            body[data-surface="desktop"] .product-row,
            body[data-surface="desktop"] .qa-section,
            body[data-surface="desktop"] .news-section {
                padding-left: 22px;
                padding-right: 22px;
            }
            body[data-surface="desktop"] .product-row {
                grid-template-columns: 1fr;
            }
            body[data-surface="desktop"] .daily-board,
            body[data-surface="desktop"] .qa-grid {
                grid-template-columns: 1fr;
            }
            body[data-surface="desktop"] .site-footer {
                grid-template-columns: 1fr;
                padding-left: 22px;
                padding-right: 22px;
            }
            body[data-surface="desktop"] .hero-copy h1 { font-size: 36px; }
            body[data-surface="desktop"] .hero-copy h1 .zh-line { font-size: 26px; }
        }