* {
    box-sizing: border-box;
}

html, body {
    margin: 0;
}

body {
    background: #efede8;
    display: flex;
    justify-content: center;
    padding: 0;
}

/* ---- accessibility: skip link ---- */

.skip-link {
    position: absolute;
    top: 0;
    left: 0;
    transform: translateY(-100%);
    z-index: 20;
    background: #14171a;
    color: #fafaf8;
    font-family: 'IBM Plex Mono', monospace;
    font-size: 13px;
    padding: 12px 20px;
    text-decoration: none;
    border-radius: 0 0 7px 0;
    transition: transform .15s ease;
}

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

/* ---- design reference: Guanxin homepage, direction "3b" ---- */

/* ---- self-hosted fonts (no Google Fonts API) ---- */

@font-face {
    font-family: 'IBM Plex Sans';
    src: url('fonts/IBMPlexSans-Regular.woff2') format('woff2');
    font-weight: 400;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: 'IBM Plex Sans';
    src: url('fonts/IBMPlexSans-Medium.woff2') format('woff2');
    font-weight: 500;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: 'IBM Plex Sans';
    src: url('fonts/IBMPlexSans-SemiBold.woff2') format('woff2');
    font-weight: 600;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: 'IBM Plex Sans';
    src: url('fonts/IBMPlexSans-Bold.woff2') format('woff2');
    font-weight: 700;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: 'IBM Plex Mono';
    src: url('fonts/IBMPlexMono-Regular.woff2') format('woff2');
    font-weight: 400;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: 'IBM Plex Mono';
    src: url('fonts/IBMPlexMono-Medium.woff2') format('woff2');
    font-weight: 500;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: 'IBM Plex Mono';
    src: url('fonts/IBMPlexMono-SemiBold.woff2') format('woff2');
    font-weight: 600;
    font-style: normal;
    font-display: swap;
}

/* ================= OPTION A — "Dossier" (IBM Plex, technical) ================= */

.a {
    --ink: #14171a;
    --sub: #5a6068;
    --line: #e2e2df;
    --acc: #ce3728;
    --paper: #fafaf8;
    width: 100%;
    max-width: 1200px;
    background: var(--paper);
    color: var(--ink);
    font-family: 'IBM Plex Sans',sans-serif;
    font-size: 16px;
    line-height: 1.5;
}

.a * {
    box-sizing: border-box;
}

.a .mono {
    font-family: 'IBM Plex Mono',monospace;
}

.a-nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 48px;
    border-bottom: 1px solid var(--line);
    position: sticky;
    top: 0;
    background: rgba(250,250,248,.92);
    backdrop-filter: blur(6px);
    z-index: 5;
}

.a-logo {
    font-family: 'IBM Plex Mono',monospace;
    font-weight: 600;
    font-size: 16px;
    letter-spacing: .02em;
}

.a-logo span {
    color: var(--acc);
}

.a-navlinks {
    display: flex;
    gap: 26px;
    font-family: 'IBM Plex Mono',monospace;
    font-size: 12.5px;
    color: var(--sub);
}

.a-navlinks a {
    text-decoration: none;
}

.a-navr {
    display: flex;
    align-items: center;
    gap: 18px;
    font-family: 'IBM Plex Mono',monospace;
    font-size: 12px;
    color: var(--sub);
}

.a-avail {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    color: var(--ink);
}

.a-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: #2ea36a;
    box-shadow: 0 0 0 3px rgba(46,163,106,.18);
}

.a-lang b {
    color: var(--ink);
}

.a-hero {
    padding: 66px 48px 54px;
    display: grid;
    grid-template-columns: 1.35fr .9fr;
    gap: 48px;
    border-bottom: 1px solid var(--line);
    background-image: linear-gradient(var(--line) 1px,transparent 1px),linear-gradient(90deg,var(--line) 1px,transparent 1px);
    background-size: 38px 38px;
    background-position: -1px -1px;
}

.a-kicker {
    font-family: 'IBM Plex Mono',monospace;
    font-size: 12px;
    color: var(--acc);
    letter-spacing: .06em;
    text-transform: uppercase;
    margin-bottom: 22px;
}

.a-h1 {
    font-size: 53px;
    line-height: 1.04;
    letter-spacing: -.022em;
    font-weight: 600;
    margin: 0 0 22px;
    max-width: 15ch;
}

.a-lead {
    font-size: 18.5px;
    line-height: 1.55;
    color: var(--sub);
    max-width: 44ch;
    margin: 0 0 30px;
}

.a-lead b {
    color: var(--ink);
    font-weight: 600;
}

.a-cta {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
    align-items: center;
}

.a-btn {
    font-family: 'IBM Plex Mono',monospace;
    font-size: 13px;
    padding: 13px 22px;
    border-radius: 7px;
    text-decoration: none;
    border: 1px solid var(--ink);
    display: inline-block;
}

.a-btn.p {
    background: var(--ink);
    color: var(--paper);
}

.a-btn.g {
    color: var(--ink);
}

.a-specs {
    border: 1px solid var(--ink);
    background: #fff;
    align-self: start;
}

.a-specs-h {
    font-family: 'IBM Plex Mono',monospace;
    font-size: 11px;
    letter-spacing: .08em;
    text-transform: uppercase;
    color: var(--sub);
    padding: 12px 18px;
    border-bottom: 1px solid var(--line);
    display: flex;
    justify-content: space-between;
}

.a-spec {
    display: flex;
    justify-content: space-between;
    gap: 14px;
    padding: 14px 18px;
    border-bottom: 1px solid var(--line);
}

.a-spec:last-child {
    border-bottom: 0;
}

.a-specs dl,
.a-cred dl {
    margin: 0;
}

.a-spec .k {
    font-family: 'IBM Plex Mono',monospace;
    font-size: 11.5px;
    color: var(--sub);
    letter-spacing: .03em;
    margin: 0;
}

.a-spec .v {
    font-weight: 600;
    font-size: 14px;
    text-align: right;
    margin: 0;
}

.a-spec .v small {
    display: block;
    font-weight: 400;
    color: var(--sub);
    font-size: 11.5px;
    font-family: 'IBM Plex Mono',monospace;
}

.a-logos {
    padding: 26px 48px;
    border-bottom: 1px solid var(--line);
    display: flex;
    align-items: center;
    gap: 34px;
    flex-wrap: wrap;
}

.a-logos .lb {
    font-family: 'IBM Plex Mono',monospace;
    font-size: 11px;
    color: var(--sub);
    letter-spacing: .05em;
    text-transform: uppercase;
}

.a-logos .lg {
    font-weight: 600;
    font-size: 15px;
    color: #41474d;
    letter-spacing: .01em;
}

.a-sec {
    padding: 60px 48px;
    border-bottom: 1px solid var(--line);
}

.a-sech {
    display: flex;
    align-items: baseline;
    gap: 16px;
    margin-bottom: 36px;
}

.a-secn {
    font-family: 'IBM Plex Mono',monospace;
    font-size: 12px;
    color: var(--acc);
}

.a-sect {
    font-size: 15px;
    font-weight: 600;
    letter-spacing: .01em;
}

.a-secd {
    margin-left: auto;
    font-size: 14px;
    color: var(--sub);
    max-width: 40ch;
    text-align: right;
}

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

.a-svc-i {
    padding: 28px 30px 30px;
    border-top: 1px solid var(--line);
    border-left: 1px solid var(--line);
}

.a-svc-i:nth-child(odd) {
    border-left: 0;
}

.a-svc-n {
    font-family: 'IBM Plex Mono',monospace;
    font-size: 12px;
    color: var(--sub);
    margin-bottom: 14px;
}

.a-svc-t {
    font-size: 21px;
    font-weight: 600;
    letter-spacing: -.01em;
    margin: 0 0 10px;
}

.a-svc-p {
    font-size: 14.5px;
    color: var(--sub);
    line-height: 1.55;
    margin: 0;
}

.a-work {
    display: grid;
    grid-template-columns: repeat(3,1fr);
    gap: 1px;
    background: var(--line);
    border: 1px solid var(--line);
}

.a-w {
    background: #fff;
    padding: 0;
}

.a-wimg {
    aspect-ratio: 4/3;
    background: repeating-linear-gradient(45deg,#eeeeeb 0 9px,#f6f6f3 9px 18px);
    position: relative;
    border-bottom: 1px solid var(--line);
}

.a-wtag {
    position: absolute;
    top: 12px;
    left: 12px;
    font-family: 'IBM Plex Mono',monospace;
    font-size: 10px;
    letter-spacing: .06em;
    color: var(--sub);
    background: rgba(255,255,255,.85);
    padding: 4px 8px;
    border-radius: 4px;
}

.a-wph {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.a-wb {
    padding: 18px 20px 22px;
}

.a-wc {
    font-family: 'IBM Plex Mono',monospace;
    font-size: 11px;
    color: var(--acc);
    margin-bottom: 7px;
}

.a-wt {
    font-size: 17px;
    font-weight: 600;
    margin: 0 0 6px;
    letter-spacing: -.01em;
}

.a-wp {
    font-size: 13.5px;
    color: var(--sub);
    line-height: 1.5;
    margin: 0;
}

.a-labs {
    padding: 60px 48px;
    background: var(--ink);
    color: #eef0f2;
    border-bottom: 1px solid var(--ink);
}

.a-labs .a-secn {
    color: #ff8a6a;
}

.a-labs-g {
    display: grid;
    grid-template-columns: 1.1fr .9fr;
    gap: 44px;
    align-items: center;
    margin-top: 8px;
}

.a-labs h3 {
    font-size: 34px;
    letter-spacing: -.02em;
    font-weight: 600;
    margin: 0 0 16px;
    line-height: 1.1;
}

.a-labs p {
    color: #a7adb4;
    font-size: 15.5px;
    line-height: 1.6;
    margin: 0 0 22px;
}

.a-labs .buy {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.a-labs .a-btn {
    border-color: #454b52;
}

.a-labs .a-btn.p {
    background: #ff8a6a;
    color: var(--ink);
    border-color: #ff8a6a;
}

.a-labs .a-btn.g {
    color: #eef0f2;
}

.a-labs-card {
    background: #1c2024;
    border: 1px solid #2a2f34;
    border-radius: 10px;
    padding: 22px;
    margin: 0;
}

.a-labs-card .row {
    display: flex;
    justify-content: space-between;
    padding: 12px 0;
    border-bottom: 1px solid #2a2f34;
    font-size: 14px;
}

.a-labs-card .row:last-child {
    border-bottom: 0;
}

.a-labs-card .row .k {
    color: #a7adb4;
    font-family: 'IBM Plex Mono',monospace;
    font-size: 12px;
    margin: 0;
}

.a-labs-card .row .v {
    font-weight: 600;
    margin: 0;
}

.a-about {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 44px;
}

.a-about p {
    font-size: 15.5px;
    line-height: 1.65;
    color: #33383d;
    margin: 0 0 16px;
}

.a-about p b {
    color: var(--ink);
}

.a-cred {
    border: 1px solid var(--line);
    border-radius: 8px;
    overflow: hidden;
    align-self: start;
}

.a-cred .a-spec {
    border-color: var(--line);
}

.a-foot {
    padding: 54px 48px 40px;
    display: grid;
    grid-template-columns: 1.4fr 1fr;
    gap: 40px;
    align-items: end;
}

.a-foot .big {
    font-size: 40px;
    letter-spacing: -.02em;
    font-weight: 600;
    line-height: 1.05;
    margin: 0 0 16px;
}

.a-foot .em {
    font-family: 'IBM Plex Mono',monospace;
    font-size: 14px;
    color: var(--acc);
    text-decoration: none;
}

.a-foot .meta {
    font-family: 'IBM Plex Mono',monospace;
    font-size: 12px;
    color: var(--sub);
    line-height: 1.8;
}

.a-foot .han {
    color: var(--ink);
}

/* ---- brand logo + refined red (turn 2) ---- */

@keyframes gx-assemble {
    0% {
        opacity: 0;
        transform: rotate(-26deg) scale(.5) translateY(16px);
    }

    55% {
        opacity: 1;
    }

    100% {
        opacity: 1;
        transform: none;
    }

}

@keyframes gx-float {
    0%, 100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-6px);
    }

}

.gx-float {
    display: inline-block;
    animation: gx-float 6.5s ease-in-out infinite;
}

.gx-mark {
    display: block;
    animation: gx-assemble 1s cubic-bezier(.2,.75,.25,1) both;
}

.a.v2 {
    --acc: #ce3728;
}

.a.v2 .a-labs .a-secn {
    color: #ff8f73;
}

.a.v2 .a-labs .a-btn.p {
    background: #ff8f73;
    border-color: #ff8f73;
}

.a-brand {
    display: flex;
    align-items: center;
    gap: 11px;
}

.a-brand img {
    height: 30px;
    width: auto;
    display: block;
}

.b.v2 {
    --acc: #d93a2a;
}

.b-brand {
    display: flex;
    align-items: center;
    gap: 12px;
}

.b-brand img {
    height: 34px;
    width: auto;
    display: block;
}

/* ---- turn 3: care woven into the Dossier ---- */

.a-mani {
    padding: 52px 48px;
    border-bottom: 1px solid var(--line);
    background: linear-gradient(90deg,rgba(217,58,42,.05),rgba(217,58,42,.02));
}

.a-mani .lead-k {
    font-family: 'IBM Plex Mono',monospace;
    font-size: 12px;
    letter-spacing: .06em;
    text-transform: uppercase;
    color: var(--acc);
    margin-bottom: 18px;
}

.a-mani p {
    font-size: 28px;
    line-height: 1.4;
    letter-spacing: -.016em;
    font-weight: 500;
    margin: 0;
    max-width: 34ch;
    color: var(--ink);
}

.a-mani em {
    color: var(--acc);
    font-style: normal;
}

.a-hpair .a-h1 .l2 {
    display: block;
    color: var(--acc);
}

.a-secn.care {
    color: var(--acc);
}

.a-outc {
    display: block;
    font-family: 'IBM Plex Mono',monospace;
    font-size: 11px;
    color: var(--sub);
    margin-bottom: 7px;
    letter-spacing: .02em;
}

/* ---- responsive: tablet & mobile breakpoints ---- */

.a-navtoggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    width: 44px;
    height: 44px;
    padding: 0;
    border: 1px solid var(--line);
    border-radius: 6px;
    background: none;
    cursor: pointer;
}

.a-navtoggle span {
    display: block;
    width: 16px;
    height: 1.5px;
    background: var(--ink);
}

.a-navdrawer {
    display: contents;
}

@media (max-width: 1024px) {
    .a-hero.a-hpair {
        grid-template-columns: 1fr;
    }

    .a-hero.a-hpair .a-specs {
        margin-top: 8px;
    }

    .a-about {
        grid-template-columns: 1fr;
    }

    .a-about .a-cred {
        margin-top: 8px;
    }

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

    .a-labs-g {
        grid-template-columns: 1fr;
    }

    /* nav switches to hamburger/drawer here (not at the 640px content
       breakpoint) because the horizontal nav itself runs out of room
       and wraps mid-word well before 640px — see design.md §8 */
    .a-navtoggle {
        display: flex;
    }

    .a-navdrawer {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        background: var(--paper);
        border-bottom: 1px solid var(--line);
        padding: 8px 24px 20px;
        z-index: 6;
    }

    .a-nav.is-open .a-navdrawer {
        display: flex;
    }

    .a-navlinks {
        flex-direction: column;
        gap: 4px;
    }

    .a-navlinks a {
        padding: 14px 0;
        border-bottom: 1px solid var(--line);
    }

    .a-navr {
        padding-top: 12px;
        justify-content: space-between;
    }
}

@media (max-width: 640px) {
    .a-nav {
        padding: 16px 24px;
    }

    .a-hero,
    .a-mani,
    .a-sec,
    .a-labs,
    .a-foot,
    .a-logos {
        padding-left: 24px;
        padding-right: 24px;
    }

    .a-h1 {
        font-size: 36px;
    }

    .a-svc {
        grid-template-columns: 1fr;
    }

    .a-svc-i {
        border-left: 0;
    }

    .a-work {
        grid-template-columns: 1fr;
    }

    .a-foot {
        grid-template-columns: 1fr;
        align-items: start;
        gap: 28px;
    }
}