:root {
    --bg: #f5f3ee;
    --surface: #ffffff;
    --ink: #15181c;
    --muted: #5d646d;
    --line: #d8d7d1;
    --accent: #2457ff;
    --accent-ink: #ffffff;
    --dark: #11151c;
    --dark-muted: #aab1bc;
    --max: 1320px;
    --reading: 760px;
    --radius: 3px;
    --shadow: 0 20px 60px rgba(15, 20, 30, 0.08);
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--ink);
    font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
    font-size: 18px;
    line-height: 1.62;
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
}

img,
svg {
    max-width: 100%;
}

a {
    color: inherit;
    text-decoration-thickness: 1px;
    text-underline-offset: 0.2em;
}

a:hover {
    color: var(--accent);
}

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

.wrap {
    width: min(calc(100% - 56px), var(--max));
    margin-inline: auto;
}

.skip-link {
    position: absolute;
    top: -100px;
    left: 20px;
    z-index: 1000;
    padding: 10px 14px;
    background: var(--ink);
    color: #fff;
}

.skip-link:focus {
    top: 18px;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    border-bottom: 1px solid rgba(21, 24, 28, 0.08);
    background: rgba(245, 243, 238, 0.94);
    backdrop-filter: blur(14px);
}

.header-inner {
    min-height: 78px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 32px;
}

.wordmark {
    display: inline-flex;
    align-items: baseline;
    gap: 0;
    color: var(--ink);
    font-size: 1.4rem;
    line-height: 1;
    font-weight: 780;
    letter-spacing: -0.045em;
    text-decoration: none;
}

.wordmark span {
    color: var(--accent);
}

.primary-nav {
    display: flex;
    align-items: center;
    gap: 30px;
}

.primary-nav a {
    color: var(--ink);
    font-size: 0.96rem;
    font-weight: 620;
    text-decoration: none;
}

.primary-nav a:hover {
    color: var(--accent);
}

.nav-contact {
    border-bottom: 1px solid var(--ink);
    padding-bottom: 2px;
}

.nav-toggle {
    display: none;
    border: 0;
    background: transparent;
    color: var(--ink);
    font: inherit;
    font-weight: 650;
    cursor: pointer;
}

.hero {
    padding: 104px 0 84px;
    border-bottom: 1px solid var(--line);
}

.hero-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.35fr) minmax(320px, 0.65fr);
    gap: 72px;
    align-items: end;
}

.eyebrow {
    margin: 0 0 22px;
    color: var(--muted);
    font-size: 0.8rem;
    font-weight: 760;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.hero h1,
.page-hero h1 {
    max-width: 980px;
    margin: 0;
    font-size: clamp(3.4rem, 7vw, 7.2rem);
    line-height: 0.94;
    letter-spacing: -0.065em;
    font-weight: 760;
}

.hero h1 .soft {
    color: #7a7d82;
}

.hero-side {
    padding-bottom: 8px;
}

.hero-side p {
    margin: 0 0 26px;
    color: #333a42;
    font-size: clamp(1.15rem, 2vw, 1.4rem);
    line-height: 1.5;
}

.button-row {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 50px;
    padding: 0 18px;
    border: 1px solid var(--ink);
    border-radius: var(--radius);
    background: var(--ink);
    color: #fff;
    font-size: 0.94rem;
    font-weight: 720;
    text-decoration: none;
    transition: transform 160ms ease, background-color 160ms ease, color 160ms ease;
}

.button:hover {
    transform: translateY(-1px);
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
}

.button.secondary {
    background: transparent;
    color: var(--ink);
}

.button.secondary:hover {
    color: #fff;
}

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

.signal-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
}

.signal {
    min-height: 120px;
    padding: 26px 28px;
    border-right: 1px solid var(--line);
}

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

.signal strong {
    display: block;
    margin-bottom: 4px;
    font-size: 1rem;
}

.signal span {
    color: var(--muted);
    font-size: 0.92rem;
}

.section {
    padding: 96px 0;
    border-bottom: 1px solid var(--line);
}

.section.dark {
    background: var(--dark);
    color: #fff;
}

.section-head {
    display: grid;
    grid-template-columns: 0.36fr 0.64fr;
    gap: 48px;
    margin-bottom: 54px;
}

.section-label {
    margin: 7px 0 0;
    color: var(--muted);
    font-size: 0.79rem;
    font-weight: 760;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.dark .section-label {
    color: var(--dark-muted);
}

.section-head h2,
.split-copy h2,
.cta-band h2 {
    margin: 0;
    font-size: clamp(2.2rem, 4.5vw, 4.6rem);
    line-height: 1.04;
    letter-spacing: -0.05em;
}

.section-intro {
    max-width: 770px;
    margin: 22px 0 0;
    color: var(--muted);
    font-size: 1.14rem;
}

.dark .section-intro {
    color: var(--dark-muted);
}

.problem-list,
.service-list,
.note-list {
    border-top: 1px solid var(--line);
}

.dark .problem-list,
.dark .service-list {
    border-color: #313741;
}

.problem-row,
.service-row,
.note-row {
    display: grid;
    grid-template-columns: 110px minmax(0, 0.9fr) minmax(0, 1.1fr) 40px;
    gap: 30px;
    align-items: start;
    padding: 30px 0;
    border-bottom: 1px solid var(--line);
    text-decoration: none;
}

.dark .problem-row,
.dark .service-row {
    border-color: #313741;
}

.row-index {
    color: var(--muted);
    font-size: 0.82rem;
    font-weight: 760;
    letter-spacing: 0.09em;
}

.dark .row-index {
    color: var(--dark-muted);
}

.problem-row h3,
.service-row h3,
.note-row h3 {
    margin: 0;
    font-size: 1.36rem;
    line-height: 1.25;
    letter-spacing: -0.02em;
}

.problem-row p,
.service-row p,
.note-row p {
    margin: 0;
    color: var(--muted);
}

.dark .problem-row p,
.dark .service-row p {
    color: var(--dark-muted);
}

.row-arrow {
    font-size: 1.35rem;
    line-height: 1;
    transition: transform 150ms ease;
}

.problem-row:hover .row-arrow,
.service-row:hover .row-arrow,
.note-row:hover .row-arrow {
    transform: translateX(5px);
}

.split {
    display: grid;
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
    gap: 90px;
    align-items: start;
}

.split-copy p {
    max-width: 690px;
    color: var(--muted);
    font-size: 1.1rem;
}

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

.principle {
    display: grid;
    grid-template-columns: 90px 1fr;
    gap: 24px;
    padding: 24px 0;
    border-bottom: 1px solid var(--line);
}

.principle strong {
    font-size: 1.05rem;
}

.principle p {
    margin: 5px 0 0;
    color: var(--muted);
}

.page-hero {
    padding: 86px 0 68px;
    border-bottom: 1px solid var(--line);
}

.page-hero h1 {
    max-width: 1120px;
    font-size: clamp(3rem, 6vw, 6rem);
}

.page-hero .lead {
    max-width: 850px;
    margin: 34px 0 0;
    color: #3e444b;
    font-size: clamp(1.15rem, 2vw, 1.45rem);
}

.breadcrumbs {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: 0 0 28px;
    color: var(--muted);
    font-size: 0.84rem;
}

.breadcrumbs a {
    color: inherit;
}

.service-detail-grid {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 360px;
    gap: 90px;
}

.prose {
    max-width: var(--reading);
}

.prose h2 {
    margin: 2.7em 0 0.7em;
    font-size: clamp(1.9rem, 3vw, 2.7rem);
    line-height: 1.12;
    letter-spacing: -0.035em;
}

.prose h3 {
    margin: 2em 0 0.6em;
    font-size: 1.35rem;
    line-height: 1.25;
}

.prose p,
.prose li {
    color: #383e45;
}

.prose ul {
    padding-left: 1.2em;
}

.prose li + li {
    margin-top: 0.42em;
}

.prose code {
    padding: 0.08em 0.28em;
    border: 1px solid var(--line);
    background: #eceae4;
    font: 0.9em ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

.prose pre {
    overflow-x: auto;
    padding: 22px;
    background: #15191f;
    color: #f4f6f8;
    font: 0.88rem/1.6 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

.sidebar {
    position: sticky;
    top: 110px;
    border-top: 2px solid var(--ink);
    padding-top: 20px;
}

.sidebar h2 {
    margin: 0 0 14px;
    font-size: 1.25rem;
}

.sidebar p {
    margin: 0 0 18px;
    color: var(--muted);
    font-size: 0.98rem;
}

.sidebar a:not(.button) {
    display: block;
    padding: 10px 0;
    border-top: 1px solid var(--line);
    font-size: 0.94rem;
    text-decoration: none;
}

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

.faq details {
    border-bottom: 1px solid var(--line);
    padding: 0;
}

.faq summary {
    cursor: pointer;
    list-style: none;
    padding: 24px 42px 24px 0;
    font-weight: 700;
    position: relative;
}

.faq summary::-webkit-details-marker {
    display: none;
}

.faq summary::after {
    content: '+';
    position: absolute;
    right: 4px;
    top: 18px;
    font-size: 1.45rem;
    font-weight: 400;
}

.faq details[open] summary::after {
    content: '−';
}

.faq details p {
    max-width: 820px;
    margin: -4px 0 24px;
    color: var(--muted);
}

.cta-band {
    padding: 84px 0;
    background: var(--accent);
    color: #fff;
}

.cta-grid {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 40px;
    align-items: end;
}

.cta-band p {
    max-width: 760px;
    margin: 18px 0 0;
    color: rgba(255,255,255,0.82);
    font-size: 1.08rem;
}

.cta-band .button {
    background: #fff;
    border-color: #fff;
    color: var(--ink);
}

.cta-band .button:hover {
    transform: translateY(-1px);
    background: var(--ink);
    border-color: var(--ink);
    color: #fff;
}

.article-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 12px 24px;
    margin-top: 24px;
    color: var(--muted);
    font-size: 0.9rem;
}

.callout {
    margin: 34px 0;
    padding: 24px 26px;
    border-left: 3px solid var(--accent);
    background: #eeece6;
}

.callout p:first-child {
    margin-top: 0;
}

.callout p:last-child {
    margin-bottom: 0;
}

.site-footer {
    padding: 74px 0 26px;
    background: #0f1319;
    color: #fff;
}

.footer-grid {
    display: grid;
    grid-template-columns: 0.75fr 1.25fr;
    gap: 70px;
    padding-bottom: 54px;
}

.wordmark-footer {
    color: #fff;
    font-size: 1.65rem;
}

.footer-brand p {
    max-width: 430px;
    color: var(--dark-muted);
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.footer-links a {
    display: block;
    margin: 8px 0;
    color: #e5e8ec;
    font-size: 0.93rem;
    text-decoration: none;
}

.footer-links a:hover {
    color: #fff;
    text-decoration: underline;
}

.footer-label {
    margin: 0 0 13px;
    color: #7e8794;
    font-size: 0.76rem;
    font-weight: 760;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.footer-bottom {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 48px;
    padding-top: 22px;
    border-top: 1px solid #2a3039;
    color: #848d99;
    font-size: 0.76rem;
}

.footer-bottom p {
    margin: 0;
}

.trademark-note {
    max-width: 860px;
    justify-self: end;
    text-align: right;
}

.not-found {
    min-height: 72vh;
    display: grid;
    align-items: center;
    padding: 70px 0;
}

.not-found h1 {
    margin: 0 0 20px;
    font-size: clamp(4rem, 12vw, 10rem);
    line-height: 0.9;
    letter-spacing: -0.07em;
}

@media (max-width: 980px) {
    .hero-grid,
    .section-head,
    .split,
    .service-detail-grid,
    .footer-grid,
    .cta-grid {
        grid-template-columns: 1fr;
        gap: 38px;
    }

    .hero-side {
        max-width: 720px;
    }

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

    .signal:nth-child(odd) {
        border-left: 1px solid var(--line);
    }

    .problem-row,
    .service-row,
    .note-row {
        grid-template-columns: 70px minmax(0, 0.9fr) minmax(0, 1.1fr) 30px;
        gap: 20px;
    }

    .sidebar {
        position: static;
        max-width: 760px;
    }

    .footer-links {
        max-width: 760px;
    }

    .footer-bottom {
        grid-template-columns: 1fr;
        gap: 12px;
    }

    .trademark-note {
        justify-self: start;
        text-align: left;
    }
}

@media (max-width: 760px) {
    body {
        font-size: 17px;
    }

    .wrap {
        width: min(calc(100% - 32px), var(--max));
    }

    .header-inner {
        min-height: 70px;
    }

    .nav-toggle {
        display: block;
    }

    .primary-nav {
        display: none;
        position: absolute;
        inset: 70px 0 auto 0;
        padding: 18px 16px 24px;
        border-bottom: 1px solid var(--line);
        background: var(--bg);
        flex-direction: column;
        align-items: stretch;
        gap: 0;
    }

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

    .primary-nav a {
        padding: 14px 0;
        border-bottom: 1px solid var(--line);
        font-size: 1.02rem;
    }

    .nav-contact {
        border-bottom: 0 !important;
    }

    .hero {
        padding: 66px 0 56px;
    }

    .hero-grid {
        gap: 34px;
    }

    .hero h1,
    .page-hero h1 {
        font-size: clamp(2.9rem, 15vw, 5rem);
        line-height: 0.96;
    }

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

    .signal,
    .signal:first-child,
    .signal:nth-child(odd) {
        min-height: auto;
        border-left: 1px solid var(--line);
        border-right: 1px solid var(--line);
        border-bottom: 1px solid var(--line);
    }

    .section {
        padding: 68px 0;
    }

    .section-head {
        margin-bottom: 32px;
    }

    .problem-row,
    .service-row,
    .note-row {
        grid-template-columns: 44px 1fr 24px;
        gap: 14px;
        padding: 24px 0;
    }

    .problem-row p,
    .service-row p,
    .note-row p {
        grid-column: 2 / -1;
        margin-top: 4px;
    }

    .row-arrow {
        grid-column: 3;
        grid-row: 1;
    }

    .principle {
        grid-template-columns: 48px 1fr;
    }

    .footer-links {
        grid-template-columns: 1fr 1fr;
    }

    .cta-band {
        padding: 64px 0;
    }
}

@media (max-width: 520px) {
    .footer-links {
        grid-template-columns: 1fr;
    }

    .button-row,
    .button {
        width: 100%;
    }

    .page-hero {
        padding: 62px 0 48px;
    }
}