:root {
    --ink: #14181f;
    --ink-soft: #343a44;
    --paper: #f4f5f1;
    --white: #ffffff;
    --blue: #1647d8;
    --blue-dark: #0d2d91;
    --blue-pale: #e8edff;
    --muted: #69717d;
    --line: #cfd3d8;
    --line-dark: rgba(255, 255, 255, 0.2);
    --sans: "IBM Plex Sans", "Noto Sans JP", "Helvetica Neue", Arial, sans-serif;
    --mono: "IBM Plex Mono", "SFMono-Regular", Consolas, monospace;
    --shell: min(1280px, calc(100vw - 64px));
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 86px;
}

body {
    margin: 0;
    color: var(--ink);
    background: var(--paper);
    font-family: var(--sans);
    font-size: 16px;
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

body.nav-open {
    overflow: hidden;
}

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

button {
    color: inherit;
    font: inherit;
}

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

:focus-visible {
    outline: 3px solid var(--blue);
    outline-offset: 4px;
}

h1,
h2,
h3,
p,
ul,
ol,
dl,
dd {
    margin: 0;
}

ul,
ol {
    padding: 0;
    list-style: none;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.skip-link {
    position: fixed;
    top: 12px;
    left: 12px;
    z-index: 1000;
    padding: 10px 16px;
    color: var(--white);
    background: var(--blue);
    font-weight: 600;
    transform: translateY(-180%);
    transition: transform 160ms ease;
}

.skip-link:focus {
    transform: translateY(0);
}

.page-shell {
    width: var(--shell);
    margin-inline: auto;
}

.section {
    padding-block: clamp(88px, 10vw, 148px);
}

.section-label {
    color: var(--blue);
    font: 500 0.72rem/1.4 var(--mono);
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.section-label-light {
    color: #9eb4ff;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    height: 78px;
    background: rgba(244, 245, 241, 0.96);
    border-bottom: 1px solid var(--line);
    transition: box-shadow 180ms ease, background 180ms ease;
}

.site-header.is-scrolled {
    background: rgba(244, 245, 241, 0.9);
    box-shadow: 0 8px 30px rgba(20, 24, 31, 0.06);
    backdrop-filter: blur(14px);
}

.header-inner {
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 32px;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 11px;
    flex: none;
    line-height: 1;
}

.brand-mark {
    width: 32px;
    height: 32px;
    display: grid;
    place-items: center;
    color: var(--white);
    background: var(--ink);
    font-size: 0.9rem;
    font-weight: 600;
}

.brand-name {
    font-size: 1rem;
    font-weight: 600;
    letter-spacing: 0.12em;
}

.brand-place {
    margin-left: 4px;
    padding-left: 14px;
    color: var(--muted);
    border-left: 1px solid var(--line);
    font: 0.66rem/1.2 var(--mono);
    letter-spacing: 0.05em;
}

.primary-nav {
    display: flex;
    align-items: center;
    gap: clamp(18px, 2.1vw, 34px);
}

.primary-nav a {
    color: var(--ink-soft);
    font-size: 0.82rem;
    font-weight: 500;
    white-space: nowrap;
    transition: color 160ms ease;
}

.primary-nav a:hover,
.primary-nav a:focus-visible {
    color: var(--blue);
}

.primary-nav .nav-secondary {
    padding-left: clamp(18px, 2vw, 32px);
    border-left: 1px solid var(--line);
    color: var(--muted);
}

.primary-nav .nav-contact {
    display: inline-flex;
    min-height: 40px;
    align-items: center;
    padding-inline: 18px;
    color: var(--white);
    background: var(--ink);
}

.primary-nav .nav-contact:hover,
.primary-nav .nav-contact:focus-visible {
    color: var(--white);
    background: var(--blue);
}

.menu-toggle {
    display: none;
    width: 44px;
    height: 44px;
    padding: 0;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 6px;
    background: transparent;
    border: 1px solid var(--line);
    cursor: pointer;
}

.menu-toggle span:not(.sr-only) {
    width: 18px;
    height: 1px;
    background: var(--ink);
    transition: transform 160ms ease;
}

.menu-toggle[aria-expanded="true"] span:nth-child(2) {
    transform: translateY(3.5px) rotate(45deg);
}

.menu-toggle[aria-expanded="true"] span:nth-child(3) {
    transform: translateY(-3.5px) rotate(-45deg);
}

.hero {
    border-bottom: 1px solid var(--line);
}

.hero-grid {
    min-height: calc(100svh - 160px);
    display: grid;
    grid-template-columns: minmax(0, 1.13fr) minmax(400px, 0.72fr);
    align-items: center;
    gap: clamp(56px, 8vw, 128px);
    padding-block: clamp(76px, 9vw, 128px);
}

.hero h1 {
    max-width: 820px;
    margin-top: 26px;
    font-size: clamp(3.2rem, 6.2vw, 6.9rem);
    font-weight: 500;
    letter-spacing: -0.066em;
    line-height: 0.95;
}

.hero h1 em {
    color: var(--blue);
    font-style: normal;
}

.hero-summary {
    max-width: 720px;
    margin-top: 35px;
    color: var(--ink-soft);
    font-size: clamp(1rem, 1.3vw, 1.16rem);
    line-height: 1.75;
}

.hero-actions {
    display: flex;
    align-items: center;
    gap: 28px;
    margin-top: 39px;
}

.button {
    min-height: 51px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding-inline: 23px;
    color: var(--white);
    background: var(--ink);
    border: 1px solid var(--ink);
    font-size: 0.86rem;
    font-weight: 600;
    transition: background 160ms ease, border-color 160ms ease;
}

.button:hover {
    background: var(--blue);
    border-color: var(--blue);
}

.button-light {
    color: var(--ink);
    background: var(--white);
    border-color: var(--white);
}

.button-light:hover {
    color: var(--white);
    background: transparent;
    border-color: var(--white);
}

.plain-link {
    padding-block: 8px;
    color: var(--ink);
    border-bottom: 1px solid var(--ink);
    font-size: 0.86rem;
    font-weight: 500;
}

.plain-link:hover {
    color: var(--blue);
    border-color: var(--blue);
}

.product-brief {
    border: 1px solid var(--ink);
    background: var(--white);
}

.brief-head {
    min-height: 45px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-inline: 17px;
    color: var(--white);
    background: var(--ink);
    font: 0.64rem/1 var(--mono);
    letter-spacing: 0.08em;
}

.brief-body {
    padding: 29px 28px 30px;
    border-bottom: 1px solid var(--line);
}

.brief-kicker {
    color: var(--blue);
    font: 500 0.7rem/1.3 var(--mono);
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.brief-body h2 {
    margin-top: 14px;
    font-size: clamp(1.75rem, 2.5vw, 2.5rem);
    font-weight: 500;
    letter-spacing: -0.04em;
    line-height: 1.08;
}

.brief-body > p:last-child {
    margin-top: 16px;
    color: var(--muted);
    font-size: 0.93rem;
}

.brief-facts div {
    display: grid;
    grid-template-columns: 0.9fr 1.1fr;
    gap: 20px;
    padding: 15px 20px;
    border-bottom: 1px solid var(--line);
}

.brief-facts dt {
    color: var(--muted);
    font: 0.66rem/1.45 var(--mono);
    text-transform: uppercase;
}

.brief-facts dd {
    font-size: 0.82rem;
    font-weight: 500;
    line-height: 1.45;
}

.brief-footnote {
    padding: 18px 20px 19px;
    color: var(--muted);
    background: #f7f8fa;
    font-size: 0.76rem;
    line-height: 1.55;
}

.company-strip {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    border-top: 1px solid var(--line);
}

.company-strip div {
    min-height: 94px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    padding: 16px 23px;
    border-right: 1px solid var(--line);
}

.company-strip div:first-child {
    border-left: 1px solid var(--line);
}

.company-strip span {
    color: var(--muted);
    font: 0.65rem/1.3 var(--mono);
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.company-strip strong,
.company-strip a {
    font-size: 0.88rem;
    font-weight: 500;
}

.company-strip a {
    text-decoration: underline;
    text-underline-offset: 3px;
}

.two-column-heading,
.company-heading {
    display: grid;
    grid-template-columns: minmax(180px, 0.48fr) minmax(0, 1.3fr);
    gap: clamp(50px, 9vw, 150px);
    align-items: start;
}

.two-column-heading > div,
.company-heading > div {
    max-width: 900px;
}

.two-column-heading h2,
.section-intro h2,
.claude-intro h2,
.development-copy h2,
.foundation-grid h2,
.company-heading h2,
.contact-inner h2 {
    font-size: clamp(2.5rem, 4.8vw, 5.2rem);
    font-weight: 500;
    letter-spacing: -0.058em;
    line-height: 1.02;
}

.two-column-heading h2,
.company-heading h2 {
    max-width: 890px;
}

.two-column-heading > div > p,
.company-heading > div > p {
    max-width: 700px;
    margin-top: 29px;
    color: var(--muted);
    font-size: 1.03rem;
}

.problem-list {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    margin-top: clamp(56px, 8vw, 105px);
    border-top: 1px solid var(--ink);
}

.problem-list article {
    min-height: 260px;
    display: flex;
    flex-direction: column;
    padding: 21px 22px 25px;
    border-right: 1px solid var(--line);
}

.problem-list article:first-child {
    border-left: 1px solid var(--line);
}

.problem-list article > span {
    color: var(--blue);
    font: 0.72rem/1 var(--mono);
}

.problem-list h3 {
    margin-top: auto;
    font-size: 1.25rem;
    font-weight: 500;
}

.problem-list p {
    margin-top: 13px;
    color: var(--muted);
    font-size: 0.9rem;
}

.product {
    background: var(--white);
    border-block: 1px solid var(--line);
}

.section-intro {
    display: grid;
    grid-template-columns: 0.48fr 1.2fr 0.7fr;
    gap: clamp(38px, 6vw, 90px);
    align-items: start;
}

.section-intro h2 {
    font-size: clamp(2.35rem, 4vw, 4.5rem);
}

.section-intro > p:last-child {
    color: var(--muted);
}

.workflow-table {
    margin-top: clamp(62px, 8vw, 108px);
    border-top: 1px solid var(--ink);
}

.workflow-head,
.workflow-table article {
    display: grid;
    grid-template-columns: 0.24fr 1.45fr 0.6fr;
    gap: 30px;
}

.workflow-head {
    padding: 12px 20px;
    color: var(--muted);
    background: #f2f3f5;
    border-bottom: 1px solid var(--line);
    font: 0.64rem/1.3 var(--mono);
    letter-spacing: 0.06em;
}

.workflow-table article {
    align-items: center;
    padding: 27px 20px;
    border-bottom: 1px solid var(--line);
}

.workflow-number {
    color: var(--blue);
    font: 0.74rem/1 var(--mono);
}

.workflow-table h3 {
    font-size: 1.28rem;
    font-weight: 500;
}

.workflow-table article div p {
    margin-top: 4px;
    color: var(--muted);
    font-size: 0.92rem;
}

.workflow-output {
    padding-left: 17px;
    border-left: 2px solid var(--blue);
    font-size: 0.85rem;
    font-weight: 500;
}

.claude {
    color: var(--white);
    background: #111722;
}

.claude-grid {
    display: grid;
    grid-template-columns: minmax(0, 0.8fr) minmax(580px, 1.2fr);
    gap: clamp(60px, 9vw, 145px);
    align-items: start;
}

.claude-intro h2 {
    margin-top: 25px;
    font-size: clamp(2.7rem, 4.6vw, 5rem);
}

.claude-intro > p:not(.section-label):not(.disclosure) {
    max-width: 600px;
    margin-top: 30px;
    color: rgba(255, 255, 255, 0.7);
    font-size: 1.04rem;
}

.disclosure {
    margin-top: 40px;
    padding-top: 17px;
    color: rgba(255, 255, 255, 0.46);
    border-top: 1px solid var(--line-dark);
    font-size: 0.75rem;
}

.system-flow {
    display: grid;
    grid-template-columns: 1fr 30px 1fr 30px 1fr 30px 1fr;
    align-items: stretch;
}

.flow-column {
    min-height: 315px;
    padding: 20px 16px 24px;
    border: 1px solid var(--line-dark);
}

.flow-primary {
    color: var(--ink);
    background: #aebfff;
    border-color: #aebfff;
}

.flow-label {
    display: block;
    min-height: 43px;
    padding-bottom: 14px;
    color: rgba(255, 255, 255, 0.5);
    border-bottom: 1px solid var(--line-dark);
    font: 0.62rem/1.35 var(--mono);
    letter-spacing: 0.06em;
}

.flow-primary .flow-label {
    color: rgba(20, 24, 31, 0.65);
    border-color: rgba(20, 24, 31, 0.2);
}

.flow-column ul {
    margin-top: 23px;
}

.flow-column li {
    padding: 8px 0;
    color: rgba(255, 255, 255, 0.72);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 0.78rem;
}

.flow-primary li {
    color: var(--ink);
    border-color: rgba(20, 24, 31, 0.14);
    font-weight: 500;
}

.flow-connector {
    position: relative;
    align-self: center;
    height: 1px;
    background: rgba(255, 255, 255, 0.45);
}

.flow-connector::after {
    content: "";
    position: absolute;
    top: -3px;
    right: 0;
    width: 7px;
    height: 7px;
    border-top: 1px solid rgba(255, 255, 255, 0.65);
    border-right: 1px solid rgba(255, 255, 255, 0.65);
    transform: rotate(45deg);
}

.development-grid {
    display: grid;
    grid-template-columns: minmax(0, 0.8fr) minmax(520px, 1fr);
    gap: clamp(60px, 10vw, 160px);
    align-items: start;
}

.development-copy h2 {
    margin-top: 25px;
    font-size: clamp(2.7rem, 4.5vw, 4.8rem);
}

.development-copy > p:not(.section-label) {
    max-width: 590px;
    margin-top: 28px;
    color: var(--muted);
}

.status-note {
    margin-top: 44px;
    padding: 21px 22px 22px;
    background: var(--blue-pale);
    border-left: 3px solid var(--blue);
}

.status-note span,
.evaluation-label {
    display: block;
    color: var(--blue);
    font: 500 0.65rem/1.35 var(--mono);
    letter-spacing: 0.06em;
}

.status-note strong {
    display: block;
    margin-top: 9px;
    font-size: 0.98rem;
    font-weight: 600;
}

.status-note p {
    margin-top: 7px;
    color: var(--muted);
    font-size: 0.78rem;
}

.development-list {
    border-top: 1px solid var(--ink);
}

.development-list li {
    display: grid;
    grid-template-columns: 54px 1fr;
    gap: 20px;
    padding: 25px 0;
    border-bottom: 1px solid var(--line);
}

.development-list li > span {
    color: var(--blue);
    font: 0.73rem/1.5 var(--mono);
}

.development-list h3 {
    font-size: 1.18rem;
    font-weight: 500;
}

.development-list p {
    margin-top: 7px;
    color: var(--muted);
    font-size: 0.91rem;
}

.evaluation-box {
    display: grid;
    grid-template-columns: minmax(0, 0.85fr) minmax(420px, 1.15fr);
    gap: clamp(50px, 8vw, 120px);
    margin-top: clamp(70px, 9vw, 125px);
    padding: clamp(34px, 5vw, 60px);
    color: var(--white);
    background: var(--blue);
}

.evaluation-box .evaluation-label {
    color: rgba(255, 255, 255, 0.64);
}

.evaluation-box h3 {
    margin-top: 15px;
    font-size: clamp(1.65rem, 2.8vw, 2.85rem);
    font-weight: 500;
    letter-spacing: -0.04em;
    line-height: 1.12;
}

.evaluation-box ul {
    border-top: 1px solid rgba(255, 255, 255, 0.45);
}

.evaluation-box li {
    padding: 12px 4px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.24);
    font-size: 0.91rem;
}

.evaluation-box li::before {
    content: "—";
    margin-right: 12px;
    color: rgba(255, 255, 255, 0.58);
}

.foundation {
    background: var(--white);
    border-block: 1px solid var(--line);
}

.foundation-grid {
    display: grid;
    grid-template-columns: minmax(0, 0.95fr) minmax(480px, 0.85fr);
    gap: clamp(70px, 12vw, 190px);
}

.foundation-grid h2 {
    max-width: 720px;
    margin-top: 26px;
    font-size: clamp(2.7rem, 4.6vw, 5rem);
}

.foundation-copy > p {
    color: var(--muted);
    font-size: 1.02rem;
}

.foundation-copy dl {
    margin-top: 47px;
    border-top: 1px solid var(--ink);
}

.foundation-copy dl div {
    display: grid;
    grid-template-columns: 0.8fr 1.2fr;
    gap: 24px;
    padding: 17px 0;
    border-bottom: 1px solid var(--line);
}

.foundation-copy dt,
.record-details dt {
    color: var(--muted);
    font: 0.68rem/1.5 var(--mono);
    text-transform: uppercase;
}

.foundation-copy dd,
.record-details dd {
    font-size: 0.9rem;
    font-weight: 500;
}

.company-heading {
    align-items: start;
}

.company-record {
    display: grid;
    grid-template-columns: 0.8fr 1.25fr 0.65fr;
    gap: clamp(45px, 7vw, 100px);
    margin-top: clamp(60px, 8vw, 105px);
    padding: clamp(30px, 4vw, 48px);
    background: var(--white);
    border: 1px solid var(--ink);
}

.record-title span {
    color: var(--muted);
    font: 0.65rem/1.4 var(--mono);
    letter-spacing: 0.06em;
}

.record-title h3 {
    margin-top: 18px;
    font-family: "Noto Sans JP", var(--sans);
    font-size: clamp(1.45rem, 2.2vw, 2.2rem);
    font-weight: 500;
}

.record-title p {
    margin-top: 5px;
    color: var(--muted);
}

.record-details {
    border-top: 1px solid var(--ink);
}

.record-details div {
    display: grid;
    grid-template-columns: 0.65fr 1.35fr;
    gap: 20px;
    padding: 14px 0;
    border-bottom: 1px solid var(--line);
}

.record-details code {
    font: 500 0.9rem/1.5 var(--mono);
}

.record-details a {
    color: var(--blue);
    text-decoration: underline;
    text-underline-offset: 3px;
}

.record-links {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 13px;
    padding-left: 25px;
    border-left: 1px solid var(--line);
}

.record-links a {
    color: var(--ink-soft);
    border-bottom: 1px solid var(--line);
    font-size: 0.78rem;
    line-height: 1.5;
}

.record-links a:hover {
    color: var(--blue);
    border-color: var(--blue);
}

.contact-panel {
    padding-block: clamp(80px, 9vw, 125px);
    color: var(--white);
    background: var(--blue);
}

.contact-inner {
    display: grid;
    grid-template-columns: minmax(0, 1.1fr) minmax(350px, 0.65fr);
    gap: clamp(60px, 11vw, 170px);
    align-items: end;
}

.contact-inner h2 {
    max-width: 800px;
    margin-top: 24px;
    font-size: clamp(2.8rem, 5vw, 5.5rem);
}

.contact-inner > div:last-child > p {
    color: rgba(255, 255, 255, 0.74);
}

.contact-inner .button {
    margin-top: 28px;
}

.site-footer {
    color: var(--white);
    background: var(--ink);
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.4fr 0.7fr 0.7fr;
    gap: 70px;
    padding-block: 68px;
}

.footer-brand .brand-mark {
    color: var(--ink);
    background: var(--white);
}

.footer-grid > div > p {
    margin-top: 24px;
    color: rgba(255, 255, 255, 0.47);
    font-size: 0.84rem;
}

.footer-grid nav {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 11px;
}

.footer-grid nav a {
    color: rgba(255, 255, 255, 0.67);
    font-size: 0.8rem;
}

.footer-grid nav a:hover {
    color: var(--white);
}

.footer-bottom {
    min-height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    color: rgba(255, 255, 255, 0.35);
    border-top: 1px solid var(--line-dark);
    font: 0.64rem/1 var(--mono);
    letter-spacing: 0.04em;
}

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

    *,
    *::before,
    *::after {
        scroll-behavior: auto !important;
        transition-duration: 0.01ms !important;
    }
}

@media (max-width: 1180px) {
    :root {
        --shell: min(100% - 48px, 1100px);
    }

    .brand-place {
        display: none;
    }

    .primary-nav {
        gap: 20px;
    }

    .primary-nav a {
        font-size: 0.77rem;
    }

    .primary-nav .nav-secondary {
        padding-left: 20px;
    }

    .hero-grid {
        grid-template-columns: minmax(0, 1.05fr) minmax(350px, 0.7fr);
        gap: 55px;
    }

    .claude-grid {
        grid-template-columns: 1fr;
    }

    .system-flow {
        max-width: 900px;
    }

    .company-record {
        grid-template-columns: 0.72fr 1.28fr;
    }

    .record-links {
        grid-column: 1 / -1;
        flex-direction: row;
        flex-wrap: wrap;
        padding: 24px 0 0;
        border-top: 1px solid var(--line);
        border-left: 0;
    }
}

@media (max-width: 900px) {
    :root {
        --shell: calc(100vw - 40px);
    }

    .site-header {
        height: 70px;
    }

    .menu-toggle {
        display: flex;
        z-index: 2;
    }

    .primary-nav {
        position: fixed;
        inset: 70px 0 0;
        display: flex;
        flex-direction: column;
        align-items: flex-start;
        gap: 0;
        padding: 24px 20px 40px;
        background: var(--paper);
        transform: translateX(100%);
        transition: transform 220ms ease;
        overflow-y: auto;
    }

    .primary-nav.is-open {
        transform: translateX(0);
    }

    .primary-nav a,
    .primary-nav .nav-secondary,
    .primary-nav .nav-contact {
        width: 100%;
        min-height: 58px;
        display: flex;
        align-items: center;
        padding: 0;
        color: var(--ink);
        background: transparent;
        border: 0;
        border-bottom: 1px solid var(--line);
        font-size: 0.95rem;
    }

    .primary-nav .nav-contact {
        margin-top: 22px;
        justify-content: center;
        color: var(--white);
        background: var(--ink);
        border: 1px solid var(--ink);
    }

    .hero-grid {
        min-height: auto;
        grid-template-columns: 1fr;
        gap: 58px;
        padding-block: 72px 68px;
    }

    .hero h1 {
        max-width: 700px;
        font-size: clamp(3.4rem, 10vw, 6rem);
    }

    .product-brief {
        max-width: 620px;
    }

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

    .company-strip div:nth-child(3) {
        border-left: 1px solid var(--line);
    }

    .company-strip div:nth-child(-n + 2) {
        border-bottom: 1px solid var(--line);
    }

    .two-column-heading,
    .company-heading,
    .section-intro,
    .development-grid,
    .foundation-grid,
    .contact-inner {
        grid-template-columns: 1fr;
        gap: 32px;
    }

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

    .problem-list article:nth-child(3) {
        border-left: 1px solid var(--line);
    }

    .problem-list article:nth-child(-n + 2) {
        border-bottom: 1px solid var(--line);
    }

    .section-intro h2 {
        max-width: 720px;
    }

    .section-intro > p:last-child {
        max-width: 620px;
    }

    .development-grid {
        gap: 65px;
    }

    .evaluation-box {
        grid-template-columns: 1fr;
        gap: 35px;
    }

    .foundation-grid {
        gap: 60px;
    }

    .contact-inner > div:last-child {
        max-width: 560px;
    }
}

@media (max-width: 680px) {
    :root {
        --shell: calc(100vw - 32px);
    }

    .section {
        padding-block: 78px;
    }

    .brand-mark {
        width: 30px;
        height: 30px;
    }

    .hero-grid {
        padding-block: 63px 56px;
    }

    .hero h1 {
        font-size: clamp(3rem, 15vw, 4.7rem);
        line-height: 0.96;
    }

    .hero-summary {
        margin-top: 28px;
        font-size: 0.98rem;
    }

    .hero-actions {
        align-items: flex-start;
        flex-direction: column;
        gap: 17px;
        margin-top: 31px;
    }

    .button {
        width: 100%;
    }

    .product-brief {
        margin-inline: -1px;
    }

    .brief-body {
        padding: 25px 20px 26px;
    }

    .brief-facts div {
        grid-template-columns: 1fr;
        gap: 5px;
    }

    .company-strip {
        grid-template-columns: 1fr;
        padding-bottom: 16px;
    }

    .company-strip div,
    .company-strip div:nth-child(3) {
        min-height: 78px;
        border-right: 1px solid var(--line);
        border-bottom: 1px solid var(--line);
        border-left: 1px solid var(--line);
    }

    .two-column-heading h2,
    .section-intro h2,
    .claude-intro h2,
    .development-copy h2,
    .foundation-grid h2,
    .company-heading h2,
    .contact-inner h2 {
        font-size: clamp(2.25rem, 11vw, 3.55rem);
    }

    .problem-list {
        grid-template-columns: 1fr;
        margin-top: 52px;
    }

    .problem-list article,
    .problem-list article:nth-child(3) {
        min-height: 205px;
        border-right: 1px solid var(--line);
        border-bottom: 1px solid var(--line);
        border-left: 1px solid var(--line);
    }

    .workflow-head {
        display: none;
    }

    .workflow-table article {
        grid-template-columns: 40px 1fr;
        gap: 14px;
        padding-inline: 8px;
    }

    .workflow-output {
        grid-column: 2;
        padding-left: 13px;
    }

    .system-flow {
        grid-template-columns: 1fr;
    }

    .flow-column {
        min-height: auto;
        padding: 19px 18px 20px;
    }

    .flow-connector {
        width: 1px;
        height: 28px;
        justify-self: center;
        background: rgba(255, 255, 255, 0.45);
    }

    .flow-connector::after {
        top: auto;
        right: -3px;
        bottom: 0;
        transform: rotate(135deg);
    }

    .flow-label {
        min-height: auto;
    }

    .flow-column ul {
        margin-top: 13px;
    }

    .development-list li {
        grid-template-columns: 38px 1fr;
        gap: 12px;
    }

    .evaluation-box {
        padding: 30px 22px;
    }

    .foundation-copy dl div,
    .record-details div {
        grid-template-columns: 1fr;
        gap: 5px;
    }

    .company-record {
        grid-template-columns: 1fr;
        gap: 38px;
        padding: 27px 21px;
    }

    .record-links {
        grid-column: auto;
        flex-direction: column;
        padding-top: 25px;
    }

    .contact-panel {
        padding-block: 75px;
    }

    .contact-inner {
        gap: 43px;
    }

    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 48px 30px;
        padding-block: 54px;
    }

    .footer-grid > div {
        grid-column: 1 / -1;
    }

    .footer-bottom {
        min-height: 78px;
        align-items: flex-start;
        justify-content: center;
        flex-direction: column;
        gap: 8px;
    }
}

@media (max-width: 360px) {
    :root {
        --shell: calc(100vw - 24px);
    }

    .brand-name {
        font-size: 0.92rem;
    }

    .hero h1 {
        font-size: 2.7rem;
    }

    .brief-head {
        padding-inline: 13px;
    }
}