:root {
    --nav-bg: #e6eef1;
    --nav-border: #c9d9e0;
    --ink: #173447;
    --ink-soft: #577080;
    --blue: #0f5c84;
    --blue-dark: #0b4667;
    --blue-light: #dbeaf0;
    --cyan: #39a8b8;
    --paper: #ffffff;
    --surface: #f2f6f7;
    --line: #dce6e9;
    --green: #20896b;
    --shadow: 0 18px 45px rgba(29, 68, 88, 0.12);
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 88px;
}

body {
    color: var(--ink);
    background: var(--surface);
    font-family: "Microsoft YaHei", "Segoe UI", Arial, sans-serif;
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
}

a {
    color: inherit;
}

button,
a {
    -webkit-tap-highlight-color: transparent;
}

button,
input {
    font: inherit;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    color: #163a52;
    background: rgba(230, 238, 241, 0.96);
    border-bottom: 1px solid var(--nav-border);
    box-shadow: 0 2px 8px rgba(30, 62, 80, 0.14);
    backdrop-filter: blur(12px);
}

.nav-inner {
    width: min(1200px, calc(100% - 40px));
    height: 64px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.brand {
    display: inline-flex;
    align-items: center;
    text-decoration: none;
}

.brand img {
    display: block;
    width: 116px;
    height: 44px;
    object-fit: contain;
}

.site-nav {
    display: flex;
    align-items: center;
    gap: 4px;
}

.site-nav a {
    padding: 8px 18px;
    color: #496979;
    border-radius: 4px;
    font-size: 15px;
    text-decoration: none;
    transition: color 0.2s, background-color 0.2s;
}

.site-nav a:hover,
.site-nav a:focus-visible {
    color: #123f5a;
    background: rgba(26, 82, 118, 0.08);
}

.site-nav a.active {
    color: #0f4f73;
    background: #d2e2e9;
    font-weight: 600;
}

.nav-toggle {
    display: none;
    width: 44px;
    height: 44px;
    padding: 10px;
    background: transparent;
    border: 0;
    cursor: pointer;
}

.nav-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    margin: 5px auto;
    background: var(--blue-dark);
    transition: transform 0.2s, opacity 0.2s;
}

.hero {
    position: relative;
    overflow: hidden;
    min-height: 590px;
    display: grid;
    align-items: center;
    background:
        linear-gradient(112deg, rgba(241, 247, 248, 0.98) 0%, rgba(235, 244, 246, 0.96) 58%, rgba(218, 236, 239, 0.92) 100%),
        repeating-linear-gradient(0deg, transparent 0 39px, rgba(15, 92, 132, 0.08) 40px),
        repeating-linear-gradient(90deg, transparent 0 39px, rgba(15, 92, 132, 0.08) 40px);
    border-bottom: 1px solid var(--line);
}

.hero::before,
.hero::after {
    content: "";
    position: absolute;
    border: 1px solid rgba(15, 92, 132, 0.12);
    border-radius: 50%;
    transform: rotate(-16deg);
}

.hero::before {
    width: 680px;
    height: 260px;
    right: -170px;
    top: 54px;
    box-shadow: 0 0 0 28px rgba(15, 92, 132, 0.025), 0 0 0 62px rgba(15, 92, 132, 0.02);
}

.hero::after {
    width: 460px;
    height: 180px;
    left: -180px;
    bottom: 42px;
    box-shadow: 0 0 0 24px rgba(15, 92, 132, 0.025);
}

.hero-grid {
    position: relative;
    z-index: 1;
    width: min(1200px, calc(100% - 40px));
    margin: 0 auto;
    display: grid;
    grid-template-columns: minmax(0, 1.08fr) minmax(390px, 0.92fr);
    align-items: center;
    gap: 76px;
    padding: 74px 0 82px;
}

.eyebrow,
.section-kicker {
    color: var(--blue);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.16em;
    text-transform: uppercase;
}

.hero h1 {
    margin-top: 16px;
    color: #16384e;
    font-size: clamp(42px, 5vw, 66px);
    line-height: 1.17;
    letter-spacing: -0.035em;
}

.hero h1 span {
    color: var(--blue);
}

.hero-lead {
    max-width: 630px;
    margin-top: 24px;
    color: var(--ink-soft);
    font-size: 17px;
    line-height: 1.9;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 32px;
}

.button {
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 11px 23px;
    border: 1px solid transparent;
    border-radius: 6px;
    font-size: 15px;
    font-weight: 600;
    text-decoration: none;
    transition: transform 0.2s, box-shadow 0.2s, background-color 0.2s;
}

.button:hover {
    transform: translateY(-2px);
}

.button:focus-visible,
.text-link:focus-visible,
.copy-hash:focus-visible,
.nav-toggle:focus-visible {
    outline: 3px solid rgba(57, 168, 184, 0.38);
    outline-offset: 3px;
}

.button-primary {
    color: #fff;
    background: var(--blue);
    border-color: var(--blue);
    box-shadow: 0 10px 24px rgba(15, 92, 132, 0.22);
}

.button-primary:hover {
    background: var(--blue-dark);
    box-shadow: 0 13px 30px rgba(15, 92, 132, 0.27);
}

.button-secondary {
    color: var(--blue-dark);
    background: rgba(255, 255, 255, 0.62);
    border-color: #abc3cc;
}

.button-secondary:hover {
    background: #fff;
}

.release-line {
    margin-top: 22px;
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 6px 14px;
    color: #607887;
    font-size: 13px;
}

.release-line strong {
    color: #24516b;
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: #2c9c72;
    box-shadow: 0 0 0 4px rgba(44, 156, 114, 0.12);
}

.survey-visual {
    position: relative;
    min-height: 420px;
    overflow: hidden;
    background:
        radial-gradient(circle at 56% 44%, rgba(255, 255, 255, 0.88), rgba(255, 255, 255, 0.25) 38%, transparent 58%),
        repeating-linear-gradient(0deg, transparent 0 31px, rgba(27, 103, 132, 0.09) 32px),
        repeating-linear-gradient(90deg, transparent 0 31px, rgba(27, 103, 132, 0.09) 32px),
        #dcebef;
    border: 1px solid rgba(86, 133, 151, 0.35);
    border-radius: 18px 18px 54px 18px;
    box-shadow: var(--shadow);
}

.survey-visual::before {
    content: "";
    position: absolute;
    inset: 42px 55px 70px 48px;
    border: 1px dashed rgba(15, 92, 132, 0.26);
    border-radius: 46% 54% 42% 58%;
    transform: rotate(-13deg);
    box-shadow: 0 0 0 24px rgba(15, 92, 132, 0.025), 0 0 0 54px rgba(15, 92, 132, 0.02);
}

.grid-label {
    position: absolute;
    color: rgba(29, 76, 98, 0.58);
    font: 11px Consolas, monospace;
    letter-spacing: 0.08em;
}

.label-north { top: 18px; left: 20px; }
.label-east { right: 18px; bottom: 16px; }

.survey-axis {
    position: absolute;
    background: rgba(15, 92, 132, 0.24);
}

.axis-x { left: 50%; top: 25px; bottom: 25px; width: 1px; }
.axis-y { top: 50%; left: 25px; right: 25px; height: 1px; }

.survey-point {
    position: absolute;
    width: 10px;
    height: 10px;
    border: 2px solid #fff;
    border-radius: 50%;
    background: var(--cyan);
    box-shadow: 0 0 0 5px rgba(57, 168, 184, 0.16);
}

.point-a { left: 19%; top: 27%; }
.point-b { right: 20%; top: 31%; }
.point-c { right: 28%; bottom: 24%; }

.survey-line {
    position: absolute;
    height: 2px;
    background: rgba(57, 168, 184, 0.55);
    transform-origin: left center;
}

.line-a { width: 58%; left: 20%; top: 28%; transform: rotate(4deg); }
.line-b { width: 42%; left: 52%; top: 48%; transform: rotate(56deg); }

.hz-mark {
    position: absolute;
    left: 50%;
    top: 45%;
    transform: translate(-50%, -50%);
    text-align: center;
}

.hz-mark span {
    display: block;
    color: var(--blue-dark);
    font: 700 92px/1 "Segoe UI", Arial, sans-serif;
    letter-spacing: -0.08em;
}

.hz-mark small {
    color: #527585;
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 0.25em;
}

.coordinate-card {
    position: absolute;
    left: 20px;
    right: 20px;
    bottom: 20px;
    padding: 13px 16px;
    display: grid;
    grid-template-columns: 1fr auto auto;
    gap: 4px 18px;
    align-items: center;
    color: #d8edf2;
    background: rgba(16, 54, 76, 0.91);
    border-left: 4px solid var(--cyan);
    box-shadow: 0 9px 22px rgba(17, 54, 73, 0.2);
    font-family: Consolas, monospace;
}

.coordinate-card span,
.coordinate-card small {
    color: #8bb6c1;
    font-size: 9px;
    letter-spacing: 0.08em;
}

.coordinate-card strong {
    font-size: 12px;
    font-weight: 500;
}

.coordinate-card small {
    grid-column: 1 / -1;
}

.section {
    width: min(1200px, calc(100% - 40px));
    margin: 0 auto;
    padding: 86px 0 0;
}

.section-heading {
    max-width: 760px;
}

.section-heading h2,
.update-card h2,
.contact-cta h2 {
    margin-top: 8px;
    color: #183a4e;
    font-size: clamp(27px, 3.3vw, 39px);
    line-height: 1.3;
    letter-spacing: -0.02em;
}

.section-heading > p:last-child {
    margin-top: 13px;
    color: var(--ink-soft);
}

.heading-row {
    max-width: none;
    display: flex;
    justify-content: space-between;
    align-items: end;
    gap: 40px;
}

.heading-row > p {
    max-width: 440px;
    margin: 0 0 4px;
    text-align: right;
}

.suite-overview {
    display: grid;
    grid-template-columns: 1fr 0.9fr;
    align-items: end;
    gap: 70px;
}

.metric-strip {
    min-height: 122px;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    background: var(--paper);
    border: 1px solid var(--line);
    border-top: 3px solid var(--blue);
    box-shadow: 0 12px 32px rgba(29, 68, 88, 0.07);
}

.metric-strip div {
    padding: 24px 18px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.metric-strip div + div {
    border-left: 1px solid var(--line);
}

.metric-strip strong {
    color: var(--blue);
    font-size: 30px;
    line-height: 1;
}

.metric-strip span {
    margin-top: 8px;
    color: #667d89;
    font-size: 12px;
}

.download-featured {
    margin-top: 30px;
    display: grid;
    grid-template-columns: minmax(0, 1.35fr) minmax(300px, 0.65fr);
    background: var(--paper);
    border: 1px solid #cadde3;
    box-shadow: var(--shadow);
}

.product-identity {
    padding: 38px 42px;
    display: flex;
    align-items: flex-start;
    gap: 26px;
    background:
        linear-gradient(135deg, rgba(219, 234, 240, 0.6), transparent 58%),
        repeating-linear-gradient(90deg, transparent 0 54px, rgba(15, 92, 132, 0.035) 55px);
}

.product-icon {
    width: 52px;
    height: 52px;
    flex: 0 0 auto;
    display: grid;
    place-items: center;
    padding: 11px;
    background: #e3eff2;
    border: 1px solid #c4dbe2;
    border-radius: 8px;
}

.product-icon img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.product-icon-large {
    width: 78px;
    height: 78px;
    padding: 16px;
}

.badge {
    display: inline-flex;
    align-items: center;
    min-height: 24px;
    padding: 3px 9px;
    color: #4e6a78;
    background: #e9f0f2;
    border: 1px solid #d4e1e5;
    border-radius: 3px;
    font-size: 11px;
    font-weight: 700;
}

.badge-primary {
    color: #fff;
    background: var(--blue);
    border-color: var(--blue);
}

.product-identity h3,
.download-card h3,
.capability-card h3 {
    color: #1d4055;
}

.product-identity h3 {
    margin-top: 11px;
    font-size: 27px;
}

.product-identity p {
    max-width: 670px;
    margin-top: 10px;
    color: var(--ink-soft);
}

.download-meta {
    padding: 34px;
    background: #f8fbfc;
    border-left: 1px solid var(--line);
}

.download-meta dl {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.download-meta dt {
    color: #78909c;
    font-size: 11px;
}

.download-meta dd {
    margin-top: 2px;
    color: #24495d;
    font-size: 14px;
    font-weight: 600;
}

.button-wide {
    width: 100%;
    margin-top: 24px;
}

.checksum {
    margin-top: 15px;
}

.checksum summary {
    color: #577281;
    font-size: 12px;
    cursor: pointer;
}

.hash-row {
    margin-top: 8px;
    display: flex;
    gap: 8px;
    align-items: center;
}

.hash-row code {
    min-width: 0;
    flex: 1;
    overflow-wrap: anywhere;
    color: #4e6571;
    font: 10px/1.5 Consolas, monospace;
}

.copy-hash {
    flex: 0 0 auto;
    padding: 4px 8px;
    color: var(--blue);
    background: transparent;
    border: 1px solid #b8cdd4;
    border-radius: 3px;
    font-size: 11px;
    cursor: pointer;
}

.download-grid {
    margin-top: 18px;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
}

.download-card {
    position: relative;
    padding: 28px 30px;
    background: var(--paper);
    border: 1px solid var(--line);
    border-left: 4px solid #8db5c3;
    transition: transform 0.2s, box-shadow 0.2s;
}

.download-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 14px 32px rgba(29, 68, 88, 0.09);
}

.download-card-top {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 16px;
}

.download-card h3 {
    margin-top: 18px;
    font-size: 20px;
}

.download-card > p {
    min-height: 52px;
    margin-top: 7px;
    color: var(--ink-soft);
    font-size: 14px;
}

.compact-meta {
    margin-top: 18px;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.compact-meta span {
    padding: 4px 8px;
    color: #647d89;
    background: #f0f5f6;
    font-size: 11px;
}

.text-link {
    margin-top: 20px;
    display: inline-flex;
    gap: 8px;
    align-items: center;
    color: var(--blue);
    font-size: 14px;
    font-weight: 700;
    text-decoration: none;
}

.text-link span {
    transition: transform 0.2s;
}

.text-link:hover span {
    transform: translateX(4px);
}

.checksum-compact {
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px solid var(--line);
}

.product-section {
    padding-bottom: 10px;
}

.product-grid {
    margin-top: 30px;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    background: var(--paper);
    border-top: 1px solid var(--line);
    border-left: 1px solid var(--line);
}

.capability-card {
    position: relative;
    min-height: 265px;
    padding: 28px;
    border-right: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
}

.capability-index {
    position: absolute;
    top: 22px;
    right: 24px;
    color: #b1c5cc;
    font: 13px Consolas, monospace;
}

.capability-card h3 {
    margin-top: 22px;
    font-size: 18px;
}

.capability-card p {
    margin-top: 8px;
    color: var(--ink-soft);
    font-size: 13px;
}

.included {
    position: absolute;
    left: 28px;
    bottom: 24px;
    color: var(--green);
    font-size: 11px;
    font-weight: 700;
}

.product-pair {
    display: flex;
}

.product-pair .product-icon + .product-icon {
    margin-left: -8px;
    background: #f0e9df;
    border-color: #e1d1b8;
}

.update-card {
    padding: 42px 48px;
    display: grid;
    grid-template-columns: 1fr auto;
    align-items: center;
    gap: 50px;
    color: #d5e8ee;
    background:
        linear-gradient(115deg, rgba(15, 74, 105, 0.97), rgba(19, 59, 78, 0.96)),
        repeating-linear-gradient(90deg, transparent 0 60px, rgba(255, 255, 255, 0.04) 61px);
    border-left: 5px solid var(--cyan);
    box-shadow: var(--shadow);
}

.update-card .section-kicker {
    color: #80d2dc;
}

.update-card h2 {
    color: #fff;
    font-size: clamp(25px, 3vw, 35px);
}

.update-card p:last-child {
    margin-top: 11px;
    color: #b9d0d8;
}

.update-flow {
    display: flex;
    align-items: center;
    gap: 9px;
    white-space: nowrap;
}

.update-flow span {
    padding: 9px 12px;
    color: #e4f4f7;
    background: rgba(255, 255, 255, 0.07);
    border: 1px solid rgba(255, 255, 255, 0.13);
    font-size: 12px;
}

.update-flow i {
    color: #72c8d4;
    font-style: normal;
}

.faq-section {
    display: grid;
    grid-template-columns: 0.65fr 1.35fr;
    gap: 70px;
    padding-bottom: 86px;
}

.faq-list {
    border-top: 1px solid #bfd0d5;
}

.faq-list details {
    padding: 20px 4px;
    border-bottom: 1px solid #ccdadd;
}

.faq-list summary {
    color: #244b60;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
}

.faq-list p {
    margin-top: 12px;
    padding-right: 30px;
    color: var(--ink-soft);
    font-size: 13px;
}

.faq-list code {
    padding: 2px 5px;
    color: #214e66;
    background: #e3ecef;
    border-radius: 3px;
    font-family: Consolas, monospace;
}

.contact-cta {
    min-height: 190px;
    padding: 46px max(30px, calc((100% - 1200px) / 2));
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 32px;
    color: #dbeef2;
    background: #17394d;
    border-top: 1px solid #2b5268;
}

.contact-cta p {
    color: #78c4d0;
    font-size: 13px;
    font-weight: 700;
}

.contact-cta h2 {
    color: #fff;
    font-size: clamp(23px, 3vw, 32px);
}

.button-light {
    flex: 0 0 auto;
    color: #17394d;
    background: #fff;
}

.site-footer {
    padding: 20px;
    color: #aaa;
    background: #1a1a2e;
    text-align: center;
    font-size: 13px;
    line-height: 1.8;
}

.site-footer a {
    color: #3498db;
    text-decoration: none;
}

.site-footer a:hover {
    text-decoration: underline;
}

@media (max-width: 980px) {
    .hero-grid {
        grid-template-columns: 1fr 0.78fr;
        gap: 34px;
    }

    .survey-visual {
        min-height: 360px;
    }

    .coordinate-card {
        grid-template-columns: 1fr;
    }

    .coordinate-card strong:last-of-type {
        display: none;
    }

    .suite-overview,
    .faq-section {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .download-featured {
        grid-template-columns: 1fr;
    }

    .download-meta {
        border-top: 1px solid var(--line);
        border-left: 0;
    }

    .product-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .update-card {
        grid-template-columns: 1fr;
        gap: 28px;
    }

    .update-flow {
        white-space: normal;
    }
}

@media (max-width: 760px) {
    .nav-inner {
        width: calc(100% - 30px);
    }

    .brand img {
        width: 90px;
        height: 34px;
    }

    .nav-toggle {
        display: block;
    }

    .nav-toggle[aria-expanded="true"] span:nth-child(1) {
        transform: translateY(7px) rotate(45deg);
    }

    .nav-toggle[aria-expanded="true"] span:nth-child(2) {
        opacity: 0;
    }

    .nav-toggle[aria-expanded="true"] span:nth-child(3) {
        transform: translateY(-7px) rotate(-45deg);
    }

    .site-nav {
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        display: none;
        padding: 10px 15px 16px;
        flex-direction: column;
        align-items: stretch;
        background: #e6eef1;
        border-bottom: 1px solid var(--nav-border);
        box-shadow: 0 9px 18px rgba(30, 62, 80, 0.14);
    }

    .site-nav.open {
        display: flex;
    }

    .site-nav a {
        min-height: 42px;
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .hero {
        min-height: 0;
    }

    .hero-grid {
        width: calc(100% - 30px);
        grid-template-columns: 1fr;
        gap: 38px;
        padding: 58px 0 48px;
    }

    .hero h1 {
        font-size: clamp(36px, 11vw, 50px);
    }

    .hero-lead {
        font-size: 15px;
    }

    .survey-visual {
        min-height: 330px;
        border-radius: 14px 14px 42px 14px;
    }

    .section {
        width: calc(100% - 30px);
        padding-top: 66px;
    }

    .heading-row {
        display: block;
    }

    .heading-row > p {
        margin-top: 12px;
        text-align: left;
    }

    .metric-strip,
    .download-grid,
    .product-grid {
        grid-template-columns: 1fr;
    }

    .metric-strip div {
        min-height: 102px;
    }

    .metric-strip div + div {
        border-top: 1px solid var(--line);
        border-left: 0;
    }

    .product-identity {
        padding: 28px 24px;
        flex-direction: column;
    }

    .download-meta,
    .download-card,
    .capability-card {
        padding: 25px 24px;
    }

    .included {
        left: 24px;
    }

    .download-card > p {
        min-height: 0;
    }

    .update-card {
        padding: 32px 25px;
    }

    .update-flow {
        flex-direction: column;
        align-items: stretch;
        text-align: center;
    }

    .update-flow i {
        transform: rotate(90deg);
    }

    .faq-section {
        padding-bottom: 66px;
    }

    .contact-cta {
        padding: 38px 22px;
        flex-direction: column;
        align-items: flex-start;
    }
}

@media (max-width: 420px) {
    .hero-actions .button {
        width: 100%;
    }

    .release-line {
        align-items: flex-start;
    }

    .survey-visual {
        min-height: 290px;
    }

    .hz-mark span {
        font-size: 74px;
    }

    .download-meta dl {
        grid-template-columns: 1fr;
    }
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        transition-duration: 0.01ms !important;
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
    }
}