:root {
    --ink: #050505;
    --ink-soft: #0d0e0e;
    --paper: #f3f4ef;
    --paper-muted: #a8aaa6;
    --mint: #57ffc3;
    --line: rgba(243, 244, 239, 0.2);
    --line-strong: rgba(243, 244, 239, 0.42);
    --display: 'IBM Plex Sans', 'Noto Sans SC', sans-serif;
    --body: 'IBM Plex Sans', 'Noto Sans SC', sans-serif;
    --mono: 'Fragment Mono', monospace;
    --page-pad: clamp(20px, 4vw, 64px);
}

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

html {
    scroll-behavior: smooth;
    background: var(--ink);
}

body {
    min-width: 320px;
    overflow-x: hidden;
    color: var(--paper);
    background: var(--ink);
    font-family: var(--body);
    font-size: 16px;
    line-height: 1.55;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

a {
    color: inherit;
}

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

button {
    font: inherit;
}

img {
    max-width: 100%;
}

::selection {
    color: var(--ink);
    background: var(--mint);
}

.skip-link {
    position: fixed;
    top: 12px;
    left: 12px;
    z-index: 100;
    padding: 10px 14px;
    color: var(--ink);
    background: var(--mint);
    font-family: var(--mono);
    font-size: 12px;
    text-decoration: none;
    transform: translateY(-160%);
}

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

.site-header {
    position: relative;
    z-index: 20;
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    min-height: 86px;
    padding: 0 var(--page-pad);
    border-bottom: 1px solid var(--line);
    background: var(--ink);
}

.brand-link {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    width: max-content;
    font-family: var(--mono);
    font-size: 11px;
    letter-spacing: 0.08em;
    text-decoration: none;
}

.brand-link img {
    width: 34px;
    height: 34px;
    object-fit: cover;
    border-radius: 7px;
}

.header-label {
    color: var(--paper-muted);
    font-family: var(--mono);
    font-size: 11px;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.header-actions {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 18px;
}

.header-email {
    font-family: var(--mono);
    font-size: 11px;
    letter-spacing: 0.04em;
    text-decoration: none;
}

.header-email {
    color: var(--mint);
}

.lang-switch {
    display: flex;
    align-items: center;
    gap: 1px;
    padding: 2px;
    border: 1px solid var(--line);
    border-radius: 999px;
    background: rgba(243, 244, 239, 0.04);
}

.lang-option {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 36px;
    min-height: 32px;
    padding: 6px 10px;
    border-radius: 999px;
    color: var(--paper-muted);
    font-family: var(--mono);
    font-size: 11px;
    line-height: 1;
    text-decoration: none;
    transition: color 0.2s ease, background-color 0.2s ease;
}

.lang-option:hover {
    color: var(--paper);
}

.lang-option.active {
    color: var(--paper);
    background: rgba(243, 244, 239, 0.12);
}

.hero {
    position: relative;
    display: grid;
    grid-template-columns: minmax(0, 1.5fr) minmax(240px, 0.5fr);
    min-height: calc(100svh - 86px);
    border-bottom: 1px solid var(--line);
}

.hero-main {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    min-width: 0;
    padding: clamp(58px, 8vw, 126px) var(--page-pad) clamp(40px, 6vw, 84px);
    border-right: 1px solid var(--line);
}

.eyebrow {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--mint);
    font-family: var(--mono);
    font-size: 11px;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.eyebrow::before {
    content: '';
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--mint);
}

.hero-title {
    margin: clamp(52px, 8vw, 110px) 0 48px;
    max-width: 1240px;
    font-family: var(--display);
    font-size: clamp(66px, 10.4vw, 176px);
    font-weight: 500;
    letter-spacing: -0.074em;
    line-height: 0.82;
}

.hero-title span {
    display: block;
}

.hero-title strong {
    display: inline-block;
    color: var(--mint);
    font-weight: 500;
    transform: translate3d(var(--mark-shift, 0), 0, 0);
    transition: transform 0.08s linear;
}

.hero-lead {
    max-width: 760px;
    color: #d2d4cf;
    font-size: clamp(19px, 2vw, 30px);
    font-weight: 400;
    letter-spacing: -0.025em;
    line-height: 1.36;
}

.hero-aside {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: clamp(58px, 8vw, 126px) var(--page-pad) clamp(40px, 6vw, 84px);
}

.hero-index {
    color: var(--paper-muted);
    font-family: var(--mono);
    font-size: 11px;
    line-height: 1.9;
    text-transform: uppercase;
}

.hero-aside-bottom {
    display: grid;
    gap: 28px;
}

.hero-cta,
.mail-cta {
    display: inline-flex;
    align-items: center;
    justify-content: space-between;
    gap: 36px;
    min-height: 58px;
    padding: 0 20px;
    color: var(--ink);
    background: var(--mint);
    border: 1px solid var(--mint);
    font-weight: 600;
    text-decoration: none;
    transition: color 0.22s ease, background 0.22s ease;
}

.hero-cta:hover,
.mail-cta:hover {
    color: var(--mint);
    background: transparent;
}

.hero-cta span:last-child,
.mail-cta span:last-child {
    font-family: var(--mono);
}

.location-note {
    color: var(--paper-muted);
    font-family: var(--mono);
    font-size: 10px;
    letter-spacing: 0.09em;
    line-height: 1.8;
    text-transform: uppercase;
}

.workbench {
    position: relative;
    margin: 0;
    border-bottom: 1px solid var(--line);
    background: #111;
}

.workbench img {
    display: block;
    width: 100%;
    height: min(70vw, 860px);
    min-height: 520px;
    object-fit: cover;
    object-position: center 52%;
    filter: grayscale(100%) contrast(1.08) brightness(0.74);
}

.workbench figcaption {
    position: absolute;
    right: var(--page-pad);
    bottom: 24px;
    left: var(--page-pad);
    display: flex;
    justify-content: flex-end;
    gap: 20px;
    color: #fff;
    font-family: var(--mono);
    font-size: 10px;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    text-align: right;
    text-shadow: 0 2px 18px #000;
}

.section {
    padding: clamp(86px, 11vw, 168px) var(--page-pad);
    border-bottom: 1px solid var(--line);
}

.section-heading {
    display: grid;
    grid-template-columns: minmax(180px, 0.42fr) minmax(0, 1fr);
    gap: clamp(28px, 7vw, 120px);
    align-items: start;
    margin-bottom: clamp(64px, 8vw, 118px);
}

.section-number,
.section-kicker {
    color: var(--paper-muted);
    font-family: var(--mono);
    font-size: 11px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.section-title {
    max-width: 980px;
    font-family: var(--display);
    font-size: clamp(42px, 6vw, 94px);
    font-weight: 450;
    letter-spacing: -0.055em;
    line-height: 0.98;
}

.principles {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    border-top: 1px solid var(--line);
}

.principle {
    min-height: 340px;
    padding: 28px 28px 38px 0;
    border-right: 1px solid var(--line);
}

.principle + .principle {
    padding-left: 28px;
}

.principle:last-child {
    border-right: 0;
}

.principle-index {
    display: block;
    margin-bottom: 96px;
    color: var(--mint);
    font-family: var(--mono);
    font-size: 11px;
}

.principle h3 {
    max-width: 330px;
    margin-bottom: 18px;
    font-size: clamp(24px, 2.4vw, 38px);
    font-weight: 500;
    letter-spacing: -0.035em;
    line-height: 1.12;
}

.principle p {
    max-width: 390px;
    color: var(--paper-muted);
    font-size: 15px;
    line-height: 1.68;
}

.opportunities-section {
    padding-right: 0;
    padding-left: 0;
}

.opportunities-section .section-heading {
    padding-right: var(--page-pad);
    padding-left: var(--page-pad);
}

.opportunity-list {
    border-top: 1px solid var(--line-strong);
}

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

.opportunity-toggle {
    display: grid;
    grid-template-columns: 76px minmax(0, 1.2fr) minmax(280px, 0.7fr) 42px;
    align-items: center;
    gap: 24px;
    width: 100%;
    min-height: 148px;
    padding: 22px var(--page-pad);
    color: var(--paper);
    background: transparent;
    border: 0;
    cursor: pointer;
    text-align: left;
    transition: background 0.22s ease;
}

.opportunity-toggle:hover,
.opportunity-toggle[aria-expanded='true'] {
    background: var(--ink-soft);
}

.opportunity-toggle:focus-visible,
.hero-cta:focus-visible,
.mail-cta:focus-visible,
.lang-option:focus-visible,
.brand-link:focus-visible,
.header-email:focus-visible,
.footer-link:focus-visible {
    outline: 2px solid var(--mint);
    outline-offset: 4px;
}

.role-index,
.role-meta,
.role-action {
    font-family: var(--mono);
    font-size: 11px;
}

.role-index,
.role-meta {
    color: var(--paper-muted);
}

.role-title {
    font-size: clamp(28px, 4vw, 58px);
    font-weight: 450;
    letter-spacing: -0.045em;
    line-height: 1;
    transition: transform 0.24s ease;
}

.opportunity-toggle:hover .role-title {
    transform: translateX(10px);
}

.role-meta {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px 20px;
    text-transform: uppercase;
}

.role-status {
    color: var(--mint);
}

.role-action {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border: 1px solid var(--line-strong);
    border-radius: 50%;
    color: var(--mint);
    font-size: 20px;
    transition: color 0.22s ease, background 0.22s ease, transform 0.24s ease;
}

.opportunity-toggle[aria-expanded='true'] .role-action {
    color: var(--ink);
    background: var(--mint);
    border-color: var(--mint);
    transform: rotate(45deg);
}

.opportunity-panel {
    padding: 0 var(--page-pad) clamp(58px, 7vw, 96px) calc(var(--page-pad) + 100px);
    background: var(--ink-soft);
}

.opportunity-panel[hidden] {
    display: none;
}

.panel-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: clamp(28px, 5vw, 86px);
    padding-top: 40px;
    border-top: 1px solid var(--line);
}

.panel-block h3 {
    margin-bottom: 18px;
    color: var(--mint);
    font-family: var(--mono);
    font-size: 11px;
    font-weight: 400;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.panel-block p,
.panel-block li {
    color: #d2d4cf;
    font-size: 15px;
    line-height: 1.72;
}

.panel-block ul {
    display: grid;
    gap: 8px;
    list-style: none;
}

.panel-block li {
    position: relative;
    padding-left: 16px;
}

.panel-block li::before {
    content: '—';
    position: absolute;
    left: 0;
    color: var(--mint);
}

.panel-apply {
    display: flex;
    justify-content: flex-end;
    margin-top: 44px;
}

.panel-apply .mail-cta {
    min-width: min(100%, 360px);
}

.process-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    border-top: 1px solid var(--line);
}

.process-step {
    min-height: 300px;
    padding: 26px 24px 34px 0;
    border-right: 1px solid var(--line);
}

.process-step + .process-step {
    padding-left: 24px;
}

.process-step:last-child {
    border-right: 0;
}

.process-step span {
    display: block;
    margin-bottom: 90px;
    color: var(--mint);
    font-family: var(--mono);
    font-size: 11px;
}

.process-step h3 {
    margin-bottom: 14px;
    font-size: 22px;
    font-weight: 500;
    letter-spacing: -0.025em;
}

.process-step p {
    color: var(--paper-muted);
    font-size: 14px;
    line-height: 1.65;
}

.final-cta {
    display: grid;
    grid-template-columns: minmax(0, 1.25fr) minmax(300px, 0.75fr);
    gap: 60px;
    align-items: end;
    min-height: 68vh;
    padding: clamp(86px, 10vw, 150px) var(--page-pad) 70px;
}

.final-cta h2 {
    max-width: 920px;
    font-size: clamp(58px, 9vw, 146px);
    font-weight: 450;
    letter-spacing: -0.07em;
    line-height: 0.84;
}

.final-cta h2 span {
    display: block;
    color: var(--mint);
}

.final-cta-aside {
    display: grid;
    gap: 22px;
}

.final-cta-aside p {
    color: var(--paper-muted);
    font-size: 15px;
}

.email-fallback {
    width: max-content;
    color: var(--paper);
    font-family: var(--mono);
    font-size: clamp(16px, 1.8vw, 24px);
    text-decoration-color: var(--mint);
    text-underline-offset: 6px;
}

.site-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    min-height: 92px;
    padding: 24px var(--page-pad);
    border-top: 1px solid var(--line);
    color: var(--paper-muted);
    font-family: var(--mono);
    font-size: 10px;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.footer-nav {
    display: flex;
    gap: 22px;
}

.footer-link {
    text-decoration: none;
}

@media (max-width: 980px) {
    .site-header {
        grid-template-columns: 1fr auto;
    }

    .header-label,
    .header-email {
        display: none;
    }

    .hero {
        grid-template-columns: 1fr;
        min-height: auto;
    }

    .hero-main {
        min-height: 76svh;
        border-right: 0;
        border-bottom: 1px solid var(--line);
    }

    .hero-aside {
        display: grid;
        grid-template-columns: 1fr minmax(240px, 0.6fr);
        gap: 34px;
        align-items: end;
        padding-top: 34px;
    }

    .section-heading {
        grid-template-columns: 1fr;
    }

    .principles,
    .panel-grid {
        grid-template-columns: 1fr;
    }

    .principle {
        min-height: 0;
        padding: 28px 0 54px;
        border-right: 0;
        border-bottom: 1px solid var(--line);
    }

    .principle + .principle {
        padding-left: 0;
    }

    .principle:last-child {
        border-bottom: 0;
    }

    .principle-index {
        margin-bottom: 48px;
    }

    .opportunity-toggle {
        grid-template-columns: 48px minmax(0, 1fr) 42px;
    }

    .role-meta {
        grid-column: 2;
        grid-row: 2;
    }

    .role-action {
        grid-column: 3;
        grid-row: 1 / span 2;
    }

    .opportunity-panel {
        padding-left: calc(var(--page-pad) + 72px);
    }

    .process-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .process-step:nth-child(2) {
        border-right: 0;
    }

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

    .final-cta {
        grid-template-columns: 1fr;
        align-items: start;
    }
}

@media (max-width: 640px) {
    .site-header {
        min-height: 68px;
    }

    .brand-link span {
        display: none;
    }

    .brand-link img {
        width: 32px;
        height: 32px;
    }

    .hero-main {
        min-height: 68svh;
        padding-top: 54px;
    }

    .hero-title {
        margin-top: 64px;
        font-size: clamp(62px, 23vw, 96px);
        line-height: 0.88;
    }

    html[lang='en'] .hero-title {
        font-size: clamp(60px, 20vw, 82px);
    }

    html[lang='zh-CN'] .hero-title {
        font-size: clamp(58px, 20vw, 86px);
    }

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

    .workbench img {
        min-height: 440px;
        height: 128vw;
    }

    .workbench figcaption {
        flex-direction: column;
        gap: 8px;
    }

    .section {
        padding-top: 82px;
        padding-bottom: 82px;
    }

    .section-heading {
        margin-bottom: 58px;
    }

    .opportunity-toggle {
        grid-template-columns: 34px minmax(0, 1fr) 36px;
        gap: 12px;
        min-height: 136px;
    }

    .role-title {
        font-size: clamp(26px, 8.2vw, 38px);
    }

    .role-meta {
        grid-template-columns: 1fr;
        font-size: 9px;
    }

    .opportunity-panel {
        padding-right: var(--page-pad);
        padding-left: var(--page-pad);
    }

    .panel-apply {
        justify-content: stretch;
    }

    .panel-apply .mail-cta {
        width: 100%;
    }

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

    .process-step,
    .process-step + .process-step {
        min-height: 240px;
        padding: 24px 0 36px;
        border-right: 0;
        border-bottom: 1px solid var(--line);
    }

    .process-step:last-child {
        border-bottom: 0;
    }

    .process-step span {
        margin-bottom: 62px;
    }

    .final-cta {
        min-height: 72svh;
        gap: 74px;
    }

    .final-cta h2 {
        font-size: clamp(62px, 19vw, 94px);
    }

    .site-footer {
        align-items: flex-start;
        flex-direction: column;
    }
}

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

    *, *::before, *::after {
        animation: none !important;
        transition: none !important;
    }

    .hero-title strong {
        transform: none !important;
    }
}