:root {
    --ink: #141414;
    --muted: #5e5a54;
    --line: rgba(20, 20, 20, 0.12);
    --paper: #f3f1eb;
    --white: #ffffff;
    --black: #090909;
    --accent: #d6ff3f;
    --accent-ink: #101400;
    --header: 76px;
    --max: 1180px;
    --shadow: 0 24px 60px rgba(0, 0, 0, 0.18);
    --font: "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Microsoft YaHei", "Source Han Sans SC", "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    font-family: var(--font);
    color: var(--ink);
    background: var(--paper);
    font-size: 16px;
    line-height: 1.7;
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
}
body.nav-lock { overflow: hidden; }
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button, input, textarea { font-family: inherit; }
h1, h2, h3, p { margin: 0; }
ul, ol { margin: 0; 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);
    border: 0;
}
.skip-link {
    position: absolute;
    left: 16px;
    top: -40px;
    background: var(--accent);
    color: var(--accent-ink);
    padding: 8px 12px;
    z-index: 100;
}
.skip-link:focus { top: 12px; }

.container {
    width: min(var(--max), calc(100% - 48px));
    margin: 0 auto;
}

.site-header {
    position: fixed;
    inset: 0 0 auto 0;
    z-index: 40;
    height: var(--header);
    color: #fff;
    background: rgba(9, 9, 9, 0.96);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}
html { scroll-padding-top: var(--header); }
section[id] { scroll-margin-top: var(--header); }
.header-inner {
    height: 100%;
    width: min(var(--max), calc(100% - 48px));
    margin: 0 auto;
    display: flex;
    align-items: center;
    gap: 28px;
}
.brand {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-right: auto;
}
.brand-mark {
    width: 36px;
    height: 36px;
    border-radius: 9px;
    background: var(--accent);
    color: var(--accent-ink);
    display: grid;
    place-items: center;
    font-weight: 700;
    letter-spacing: -0.04em;
}
.brand-text {
    display: flex;
    flex-direction: column;
    line-height: 1.1;
}
.brand-text strong { font-size: 16px; font-weight: 650; letter-spacing: 0.04em; }
.brand-text em {
    font-style: normal;
    font-size: 11px;
    letter-spacing: 0.22em;
    opacity: 0.62;
}
.site-nav ul {
    display: flex;
    gap: 4px;
}
.site-nav a {
    display: block;
    padding: 8px 12px;
    font-size: 14px;
    color: rgba(255, 255, 255, 0.72);
    border-radius: 999px;
}
.site-nav a:hover,
.site-nav a.is-active { color: #fff; }
.site-nav a.is-active { background: rgba(255, 255, 255, 0.08); }
.header-cta {
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 999px;
    padding: 8px 16px;
    font-size: 14px;
}
.header-cta:hover { background: #fff; color: var(--black); }
.nav-toggle {
    display: none;
    width: 42px;
    height: 42px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 10px;
    background: transparent;
    padding: 0;
    position: relative;
}
.nav-toggle span {
    position: absolute;
    left: 11px;
    right: 11px;
    height: 1.5px;
    background: #fff;
}
.nav-toggle span:first-of-type { top: 16px; }
.nav-toggle span:last-of-type { top: 24px; }
.nav-toggle[aria-expanded="true"] span:first-of-type { top: 20px; transform: rotate(40deg); }
.nav-toggle[aria-expanded="true"] span:last-of-type { top: 20px; transform: rotate(-40deg); }

.hero {
    position: relative;
    min-height: 100vh;
    background: var(--black);
    color: #fff;
    padding: calc(var(--header) + 48px) 0 0;
    overflow: hidden;
}
.hero-grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.045) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.045) 1px, transparent 1px);
    background-size: 72px 72px;
    mask-image: radial-gradient(ellipse at 70% 20%, #000 20%, transparent 72%);
}
.hero-layout {
    position: relative;
    display: grid;
    grid-template-columns: 1.15fr 0.85fr;
    gap: 64px;
    align-items: end;
    padding-bottom: 72px;
}
.eyebrow {
    margin-bottom: 20px;
    font-size: 13px;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--accent);
}
.hero h1 {
    font-size: clamp(48px, 6.4vw, 88px);
    line-height: 1.02;
    letter-spacing: -0.045em;
    font-weight: 650;
}
.lede {
    max-width: 460px;
    margin-top: 24px;
    color: rgba(255, 255, 255, 0.68);
    font-size: 17px;
}
.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 36px;
}
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 0 22px;
    border-radius: 999px;
    border: 1px solid transparent;
    font-size: 15px;
    cursor: pointer;
    transition: transform 0.2s ease, background 0.2s ease, color 0.2s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: var(--accent); color: var(--accent-ink); font-weight: 650; }
.btn-primary:hover { background: #e7ff7a; }
.btn-ghost { border-color: rgba(255, 255, 255, 0.22); color: #fff; }
.btn-ghost:hover { background: #fff; color: var(--black); }

.hero-board {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 28px;
    padding: 22px;
    box-shadow: var(--shadow);
    backdrop-filter: blur(10px);
}
.board-head {
    display: flex;
    justify-content: space-between;
    font-size: 12px;
    letter-spacing: 0.18em;
    color: rgba(255, 255, 255, 0.5);
    padding: 6px 8px 16px;
}
.board-list li {
    display: flex;
    gap: 16px;
    align-items: center;
    padding: 16px 10px;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
}
.board-list .idx {
    color: var(--accent);
    font-variant-numeric: tabular-nums;
    font-size: 13px;
    width: 28px;
}
.board-list strong { display: block; font-size: 18px; font-weight: 600; letter-spacing: -0.02em; }
.board-list small { color: rgba(255, 255, 255, 0.52); font-size: 13px; }

.trust-strip {
    position: relative;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
}
.trust-inner {
    display: flex;
    align-items: center;
    gap: 28px;
    min-height: 84px;
}
.trust-label {
    flex: none;
    font-size: 12px;
    letter-spacing: 0.18em;
    color: rgba(255, 255, 255, 0.45);
}
.trust-inner ul {
    display: flex;
    flex-wrap: wrap;
    gap: 10px 28px;
}
.trust-inner li {
    font-size: 18px;
    letter-spacing: 0.08em;
    color: rgba(255, 255, 255, 0.86);
}

.section { padding: 112px 0; }
.section-index {
    display: block;
    margin-bottom: 14px;
    font-size: 12px;
    letter-spacing: 0.2em;
    color: #8a847a;
}
.section-index.light { color: rgba(255, 255, 255, 0.45); }
.section-kicker h2,
.section-heading h2,
.contact-intro h2 {
    font-size: clamp(36px, 4vw, 56px);
    letter-spacing: -0.045em;
    line-height: 1.05;
    font-weight: 650;
}
.section-kicker p,
.section-heading > p {
    margin-top: 14px;
    color: var(--muted);
    font-size: 16px;
}
.section-heading {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    gap: 24px;
    margin-bottom: 40px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--line);
}

.about { background: var(--paper); }
.about-layout {
    display: grid;
    grid-template-columns: 0.8fr 1.2fr;
    gap: 72px;
}
.about-body h3 {
    font-size: 28px;
    letter-spacing: -0.03em;
    line-height: 1.35;
    margin-bottom: 18px;
}
.about-body p { color: #3c3934; margin-bottom: 14px; font-size: 17px; }
.name-split {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin: 28px 0 22px;
}
.name-split div {
    background: var(--white);
    border: 1px solid var(--line);
    border-radius: 18px;
    padding: 20px 22px;
}
.name-split strong {
    display: block;
    font-size: 28px;
    letter-spacing: 0.08em;
}
.name-split span { color: var(--muted); }
.text-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-weight: 650;
    border-bottom: 1px solid var(--ink);
    padding-bottom: 2px;
}
.text-link:hover { color: #3d4d00; border-color: #3d4d00; }

.services { background: #ebe8e1; }
.service-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}
.service-card {
    background: var(--white);
    border-radius: 24px;
    padding: 28px 28px 32px;
    min-height: 250px;
    display: flex;
    flex-direction: column;
    border: 1px solid transparent;
    transition: transform 0.25s ease, border-color 0.25s ease;
}
.service-card:hover {
    transform: translateY(-4px);
    border-color: var(--ink);
}
.service-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: auto;
}
.service-top .idx {
    font-size: 13px;
    letter-spacing: 0.14em;
    color: #8d877e;
}
.service-top svg { width: 36px; height: 36px; }
.service-card h3 {
    margin-top: 48px;
    font-size: 28px;
    letter-spacing: -0.03em;
}
.service-card p { margin-top: 10px; color: var(--muted); max-width: 36em; }

.advantages { background: var(--paper); }
.advantage-list { border-top: 1px solid var(--line); }
.advantage-list li {
    display: grid;
    grid-template-columns: 140px 1fr;
    gap: 24px;
    align-items: center;
    padding: 32px 12px;
    border-bottom: 1px solid var(--line);
    transition: background 0.2s ease, color 0.2s ease;
}
.advantage-list .num {
    font-size: 42px;
    letter-spacing: -0.05em;
    color: #b7b1a6;
    font-variant-numeric: tabular-nums;
}
.advantage-list h3 { font-size: 26px; letter-spacing: -0.03em; }
.advantage-list p { margin-top: 6px; color: var(--muted); max-width: 46em; }
@media (hover: hover) {
    .advantage-list li:hover { background: var(--black); color: #fff; border-radius: 18px; }
    .advantage-list li:hover .num,
    .advantage-list li:hover p { color: rgba(255, 255, 255, 0.62); }
    .advantage-list li:hover .num { color: var(--accent); }
}

.partners { background: var(--white); }
.partner-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    border: 1px solid var(--line);
    border-radius: 24px;
    overflow: hidden;
}
.partner-grid li {
    min-height: 180px;
    display: grid;
    place-items: center;
    border-right: 1px solid var(--line);
    background: var(--paper);
}
.partner-grid li:last-child { border-right: 0; }
.partner-grid span {
    font-size: clamp(22px, 2vw, 30px);
    letter-spacing: 0.12em;
    font-weight: 650;
}
.partner-grid li:hover { background: var(--black); color: var(--accent); }

.contact {
    background: var(--black);
    color: #fff;
}
.contact-layout {
    display: grid;
    grid-template-columns: 0.9fr 1.1fr;
    gap: 72px;
    align-items: start;
}
.contact-lead { margin-top: 16px; color: rgba(255, 255, 255, 0.62); font-size: 18px; }
.contact-list { margin-top: 40px; display: grid; gap: 22px; }
.contact-list span {
    display: block;
    font-size: 12px;
    letter-spacing: 0.16em;
    color: rgba(255, 255, 255, 0.45);
    margin-bottom: 4px;
}
.contact-list a { border-bottom: 1px solid rgba(214, 255, 63, 0.7); }
.contact-list strong { font-weight: 550; }
.contact-form {
    background: #141414;
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 28px;
    padding: 28px;
}
.field { margin-bottom: 18px; }
.field label {
    display: block;
    font-size: 13px;
    color: rgba(255, 255, 255, 0.55);
    margin-bottom: 6px;
}
.field input,
.field textarea {
    width: 100%;
    background: transparent;
    border: 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.18);
    color: #fff;
    padding: 10px 0 12px;
    font-size: 16px;
    outline: none;
    resize: none;
}
.field input:focus,
.field textarea:focus { border-bottom-color: var(--accent); }
.field input:user-invalid,
.field textarea:user-invalid { border-bottom-color: #ff8d7a; }
.form-note {
    min-height: 1.4em;
    margin-top: 14px;
    font-size: 14px;
    color: var(--accent);
}

.site-footer {
    background: #050505;
    color: rgba(255, 255, 255, 0.72);
    padding: 64px 0 28px;
}
.footer-top {
    display: grid;
    grid-template-columns: 1.4fr 1fr 1fr;
    gap: 32px;
    padding-bottom: 36px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}
.footer-brand strong {
    display: block;
    color: #fff;
    font-size: 22px;
    letter-spacing: -0.03em;
}
.footer-brand p { margin-top: 8px; }
.site-footer h3 {
    color: #fff;
    font-size: 14px;
    letter-spacing: 0.12em;
    font-weight: 600;
    margin-bottom: 14px;
}
.site-footer li + li { margin-top: 8px; }
.site-footer a:hover { color: var(--accent); }
.footer-bottom {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
    padding-top: 22px;
    font-size: 13px;
    color: rgba(255, 255, 255, 0.48);
}

:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
}

@media (max-width: 900px) {
    .nav-toggle { display: block; }
    .header-cta { display: none; }
    .site-nav {
        position: fixed;
        inset: var(--header) 0 0 0;
        background: #090909;
        transform: translateY(-12px);
        opacity: 0;
        visibility: hidden;
        pointer-events: none;
    }
    .site-nav.is-open {
        opacity: 1;
        visibility: visible;
        pointer-events: auto;
        transform: none;
    }
    .site-nav ul { flex-direction: column; padding: 20px 24px; gap: 4px; }
    .site-nav a { font-size: 22px; padding: 14px 4px; border-radius: 0; }
    .hero-layout,
    .about-layout,
    .contact-layout,
    .footer-top,
    .service-grid { grid-template-columns: 1fr; }
    .partner-grid { grid-template-columns: 1fr 1fr; }
    .partner-grid li:nth-child(2) { border-right: 0; }
    .partner-grid li { border-bottom: 1px solid var(--line); min-height: 120px; }
    .section-heading { flex-direction: column; align-items: flex-start; }
    .advantage-list li { grid-template-columns: 64px 1fr; }
    .hero { min-height: auto; }
    .hero-layout { gap: 36px; padding-bottom: 48px; }
    .section { padding: 80px 0; }
}

@media (max-width: 640px) {
    .container,
    .header-inner { width: min(var(--max), calc(100% - 32px)); }
    .hero h1 { font-size: 42px; }
    .name-split,
    .partner-grid { grid-template-columns: 1fr; }
    .partner-grid li { border-right: 0; }
    .advantage-list li { grid-template-columns: 1fr; gap: 8px; }
    .trust-inner { flex-direction: column; align-items: flex-start; padding: 18px 0; }
}

@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    *, *::before, *::after {
        animation: none !important;
        transition: none !important;
    }
}