:root {
    --carbon: #081018;
    --carbon-2: #101820;
    --steel: #25313b;
    --ink: #111820;
    --text: #2b3740;
    --muted: #66747f;
    --line: rgba(16, 24, 32, 0.12);
    --paper: #f4f5f2;
    --panel: #ffffff;
    --cyan: #20b8c8;
    --mint: #6fbf92;
    --amber: #c9a24f;
    --oxide: #b65b4b;
    --shadow: 0 28px 80px rgba(8, 16, 24, 0.18);
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    color: var(--text);
    background: var(--paper);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
    line-height: 1.6;
}

body::selection {
    color: var(--carbon);
    background: var(--cyan);
}

a {
    color: inherit;
    text-decoration: none;
}

img {
    display: block;
    max-width: 100%;
}

.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 20;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    min-height: 76px;
    padding: 14px clamp(20px, 5vw, 72px);
    color: #fff;
    background: rgba(8, 16, 24, 0.46);
    border-bottom: 1px solid rgba(255, 255, 255, 0.09);
    backdrop-filter: blur(20px);
    transition: background 180ms ease, box-shadow 180ms ease;
}

.site-header.is-scrolled {
    background: rgba(8, 16, 24, 0.94);
    box-shadow: 0 14px 40px rgba(0, 0, 0, 0.24);
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    min-width: 0;
}

.brand-mark {
    display: grid;
    width: 44px;
    height: 44px;
    place-items: center;
    color: var(--carbon);
    background: linear-gradient(135deg, #e8d79a, var(--cyan) 54%, var(--mint));
    border-radius: 7px;
    font-size: 14px;
    font-weight: 900;
    letter-spacing: 0;
}

.brand-text strong,
.brand-text small {
    display: block;
}

.brand-text strong {
    color: #fff;
    font-size: 18px;
    line-height: 1.1;
}

.brand-text small {
    margin-top: 4px;
    color: rgba(255, 255, 255, 0.62);
    font-size: 10px;
    letter-spacing: 0;
}

.site-nav {
    display: flex;
    align-items: center;
    gap: clamp(16px, 2.2vw, 32px);
    color: rgba(255, 255, 255, 0.78);
    font-size: 14px;
}

.site-nav a {
    padding: 8px 0;
}

.site-nav a:hover {
    color: #fff;
}

.nav-toggle {
    display: none;
    width: 42px;
    height: 42px;
    padding: 0;
    border: 1px solid rgba(255, 255, 255, 0.22);
    border-radius: 7px;
    background: rgba(255, 255, 255, 0.08);
}

.nav-toggle span {
    display: block;
    width: 18px;
    height: 2px;
    margin: 4px auto;
    background: #fff;
}

.hero {
    position: relative;
    min-height: 100vh;
    padding: 128px clamp(20px, 5vw, 72px) 34px;
    overflow: hidden;
    color: #fff;
    background: #060b10;
    isolation: isolate;
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: -3;
    background:
        radial-gradient(circle at 72% 42%, rgba(32, 184, 200, 0.2), transparent 36%),
        radial-gradient(circle at 48% 82%, rgba(201, 162, 79, 0.14), transparent 30%),
        linear-gradient(135deg, #060b10 0%, #101821 48%, #14231e 100%);
}

.hero-bg::before {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg, rgba(6, 11, 16, 0.94) 0%, rgba(6, 11, 16, 0.72) 42%, rgba(6, 11, 16, 0.24) 100%);
}

.hero-bg::after {
    content: "";
    position: absolute;
    inset: 0;
    opacity: 0.18;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.08) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.08) 1px, transparent 1px);
    background-size: 84px 84px;
    mask-image: linear-gradient(to bottom, transparent, #000 14%, #000 78%, transparent);
}

.hero-canvas {
    position: absolute;
    inset: 0;
    z-index: -2;
    width: 100%;
    height: 100%;
    opacity: 0.92;
}

.hero::after {
    content: "";
    position: absolute;
    inset: 0;
    z-index: -1;
    background:
        linear-gradient(90deg, rgba(6, 11, 16, 0.88) 0%, rgba(6, 11, 16, 0.58) 45%, rgba(6, 11, 16, 0.1) 76%, rgba(6, 11, 16, 0.28) 100%),
        linear-gradient(180deg, rgba(6, 11, 16, 0.06) 0%, rgba(6, 11, 16, 0.22) 76%, rgba(6, 11, 16, 0.78) 100%);
    pointer-events: none;
}

.hero-shell {
    position: relative;
    z-index: 1;
    display: grid;
    min-height: calc(100vh - 196px);
    max-width: 1280px;
    margin: 0 auto;
    align-content: end;
    gap: clamp(34px, 6vh, 76px);
}

.hero-copy {
    max-width: 780px;
    padding-bottom: clamp(12px, 4vh, 46px);
}

.eyebrow,
.section-kicker {
    margin: 0 0 14px;
    color: var(--cyan);
    font-size: 12px;
    font-weight: 900;
    letter-spacing: 0;
    text-transform: uppercase;
}

.hero h1 {
    max-width: 780px;
    margin: 0;
    font-size: clamp(52px, 8vw, 106px);
    line-height: 0.98;
    letter-spacing: 0;
    text-shadow: 0 22px 80px rgba(0, 0, 0, 0.42);
}

.hero-text {
    max-width: 720px;
    margin: 28px 0 0;
    color: rgba(255, 255, 255, 0.76);
    font-size: clamp(17px, 1.45vw, 21px);
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 34px;
}

.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 0 22px;
    border: 1px solid transparent;
    border-radius: 7px;
    font-weight: 900;
}

.button.primary {
    color: var(--carbon);
    background: var(--cyan);
}

.button.secondary {
    color: #fff;
    border-color: rgba(255, 255, 255, 0.24);
    background: rgba(255, 255, 255, 0.08);
}

.hero-indicators {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    border-top: 1px solid rgba(255, 255, 255, 0.18);
}

.hero-indicators div {
    min-width: 0;
    padding: 22px clamp(14px, 2.8vw, 32px) 18px 0;
    border-right: 1px solid rgba(255, 255, 255, 0.12);
}

.hero-indicators div:last-child {
    border-right: 0;
}

.hero-indicators strong,
.hero-indicators span {
    display: block;
}

.hero-indicators strong {
    color: #fff;
    font-size: clamp(22px, 2.6vw, 36px);
    line-height: 1;
}

.hero-indicators span {
    margin-top: 9px;
    color: rgba(255, 255, 255, 0.62);
    font-size: 14px;
}

.section {
    padding: clamp(78px, 9vw, 132px) clamp(20px, 5vw, 72px);
}

.section-heading,
.about-layout,
.platform-layout,
.application-table,
.approach-track,
.contact-layout {
    max-width: 1220px;
    margin: 0 auto;
}

.section-heading {
    margin-bottom: clamp(32px, 5vw, 60px);
}

.section-heading.wide h2 {
    max-width: 900px;
}

.section h2 {
    margin: 0;
    color: var(--ink);
    font-size: clamp(32px, 4.3vw, 56px);
    line-height: 1.12;
    letter-spacing: 0;
}

.about-section {
    background: var(--paper);
}

.about-layout {
    display: grid;
    grid-template-columns: minmax(280px, 0.56fr) minmax(0, 1fr);
    gap: clamp(34px, 6vw, 88px);
    align-items: start;
}

.about-copy {
    padding-top: 4px;
}

.about-copy p {
    margin: 0 0 18px;
    color: var(--muted);
    font-size: 18px;
}

.principle-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
}

.principle-card {
    min-height: 250px;
    padding: 26px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: var(--panel);
    box-shadow: 0 18px 50px rgba(8, 16, 24, 0.07);
}

.principle-card h3 {
    margin: 0 0 18px;
    color: var(--ink);
    font-size: 21px;
    line-height: 1.25;
}

.principle-card p {
    margin: 0;
    color: var(--muted);
}

.platform-section {
    color: #fff;
    background: linear-gradient(180deg, var(--carbon) 0%, #111c20 100%);
}

.platform-layout {
    display: grid;
    grid-template-columns: minmax(280px, 0.48fr) minmax(0, 1fr);
    gap: clamp(34px, 6vw, 84px);
    align-items: start;
}

.platform-heading {
    position: sticky;
    top: 108px;
    margin-bottom: 0;
}

.platform-heading h2,
.platform-section h2 {
    color: #fff;
}

.platform-heading p:last-child {
    margin: 22px 0 0;
    color: rgba(255, 255, 255, 0.64);
    font-size: 17px;
}

.platform-stack {
    display: grid;
    gap: 16px;
}

.stack-card {
    position: relative;
    display: grid;
    grid-template-columns: 70px minmax(150px, 0.45fr) minmax(0, 1fr);
    gap: 24px;
    align-items: start;
    padding: 28px;
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 9px;
    background: rgba(255, 255, 255, 0.055);
}

.stack-card::before {
    content: "";
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    width: 4px;
    background: linear-gradient(180deg, var(--cyan), var(--mint), var(--amber));
}

.stack-card span {
    color: var(--cyan);
    font-size: 28px;
    font-weight: 900;
    line-height: 1;
}

.stack-card h3 {
    margin: 0;
    color: #fff;
    font-size: 23px;
    line-height: 1.2;
}

.stack-card ul {
    margin: 0;
    padding: 0;
    list-style: none;
}

.stack-card li {
    position: relative;
    padding: 0 0 10px 18px;
    color: rgba(255, 255, 255, 0.66);
}

.stack-card li::before {
    content: "";
    position: absolute;
    top: 10px;
    left: 0;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--amber);
}

.applications-section {
    background: #fff;
}

.application-table {
    border-top: 1px solid var(--line);
}

.application-row {
    display: grid;
    grid-template-columns: minmax(160px, 0.28fr) minmax(220px, 0.42fr) minmax(0, 1fr);
    gap: clamp(20px, 4vw, 56px);
    align-items: start;
    padding: clamp(24px, 4vw, 38px) 0;
    border-bottom: 1px solid var(--line);
}

.application-row span {
    color: var(--muted);
    font-size: 12px;
    font-weight: 900;
    text-transform: uppercase;
}

.application-row h3 {
    margin: 0;
    color: var(--ink);
    font-size: clamp(22px, 2.4vw, 30px);
    line-height: 1.2;
}

.application-row p {
    margin: 0;
    color: var(--muted);
    font-size: 17px;
}

.approach-section {
    background: #edf0ec;
}

.approach-track {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
}

.approach-item {
    min-height: 280px;
    padding: 28px;
    border: 1px solid rgba(16, 24, 32, 0.1);
    border-radius: 8px;
    background: var(--panel);
    box-shadow: 0 20px 52px rgba(8, 16, 24, 0.08);
}

.approach-item span {
    display: inline-flex;
    width: 46px;
    height: 46px;
    align-items: center;
    justify-content: center;
    margin-bottom: 34px;
    color: var(--carbon);
    background: var(--amber);
    border-radius: 50%;
    font-weight: 900;
}

.approach-item h3 {
    margin: 0 0 14px;
    color: var(--ink);
    font-size: 23px;
}

.approach-item p {
    margin: 0;
    color: var(--muted);
}

.contact-section {
    color: #fff;
    background: linear-gradient(135deg, #081018 0%, #10251e 58%, #2a2113 100%);
}

.contact-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(320px, 460px);
    gap: clamp(32px, 6vw, 86px);
    align-items: center;
}

.contact-section h2 {
    color: #fff;
}

.contact-section p {
    max-width: 760px;
    color: rgba(255, 255, 255, 0.68);
    font-size: 17px;
}

.contact-card {
    padding: 32px;
    border: 1px solid rgba(255, 255, 255, 0.14);
    border-radius: 9px;
    background: rgba(255, 255, 255, 0.075);
    box-shadow: var(--shadow);
}

.contact-card dl {
    margin: 0;
}

.contact-card div {
    padding: 18px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.13);
}

.contact-card div:first-child {
    padding-top: 0;
}

.contact-card div:last-child {
    padding-bottom: 0;
    border-bottom: 0;
}

.contact-card dt {
    color: rgba(255, 255, 255, 0.52);
    font-size: 13px;
}

.contact-card dd {
    margin: 6px 0 0;
    color: #fff;
    font-size: 18px;
    font-weight: 900;
    word-break: break-word;
}

.site-footer {
    display: flex;
    justify-content: space-between;
    gap: 20px;
    padding: 26px clamp(20px, 5vw, 72px);
    color: rgba(255, 255, 255, 0.58);
    background: #05090d;
    font-size: 14px;
}

.site-footer p {
    margin: 0;
}

@media (max-width: 1020px) {
    .about-layout,
    .platform-layout,
    .contact-layout {
        grid-template-columns: 1fr;
    }

    .platform-heading {
        position: static;
    }

    .principle-grid,
    .approach-track {
        grid-template-columns: 1fr;
    }

    .stack-card {
        grid-template-columns: 56px minmax(0, 1fr);
    }

    .stack-card ul {
        grid-column: 2;
    }

    .application-row {
        grid-template-columns: 1fr;
        gap: 12px;
    }
}

@media (max-width: 900px) {
    .nav-toggle {
        display: block;
    }

    .site-nav {
        position: absolute;
        top: calc(100% + 1px);
        left: 0;
        right: 0;
        display: none;
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        padding: 10px 20px 18px;
        background: rgba(8, 16, 24, 0.96);
    }

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

    .site-nav a {
        padding: 13px 0;
        border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }

    .hero {
        min-height: auto;
        padding-top: 112px;
        padding-bottom: 24px;
    }

    .hero-shell {
        min-height: auto;
        align-content: start;
        gap: 34px;
    }

    .hero-copy {
        padding-bottom: 0;
    }

    .hero-indicators {
        grid-template-columns: 1fr;
    }

    .hero-indicators div {
        border-right: 0;
        border-bottom: 1px solid rgba(255, 255, 255, 0.12);
    }

    .hero-indicators div:last-child {
        border-bottom: 0;
    }
}

@media (max-width: 560px) {
    .site-header {
        min-height: 66px;
        padding: 11px 16px;
    }

    .brand-mark {
        width: 38px;
        height: 38px;
    }

    .brand-text strong {
        font-size: 16px;
    }

    .brand-text small {
        max-width: 150px;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
    }

    .hero,
    .section {
        padding-left: 16px;
        padding-right: 16px;
    }

    .hero h1 {
        font-size: 42px;
    }

    .hero-text {
        margin-top: 20px;
        font-size: 16px;
    }

    .hero-indicators div {
        padding-right: 0;
    }

    .button {
        width: 100%;
    }

    .stack-card {
        display: block;
    }

    .stack-card h3 {
        margin-top: 14px;
    }

    .stack-card ul {
        margin-top: 18px;
    }

    .site-footer {
        display: block;
    }

    .site-footer p + p {
        margin-top: 8px;
    }
}