:root {
  --ink: #171714;
  --ink-soft: #45433d;
  --paper: #f3efe5;
  --paper-deep: #e8e1d3;
  --red: #c43c28;
  --red-dark: #9f2d1e;
  --line: rgba(23, 23, 20, 0.22);
  --line-light: rgba(243, 239, 229, 0.26);
  --serif: "Noto Serif CJK SC", "Source Han Serif SC", "Songti SC", SimSun, serif;
  --sans: "Noto Sans CJK SC", "Source Han Sans SC", "Microsoft YaHei", sans-serif;
  --shell: min(1440px, calc(100% - 64px));
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 90px;
}

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

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 1000;
  opacity: 0.2;
  pointer-events: none;
  background-image:
    radial-gradient(circle at 15% 35%, rgba(0,0,0,.16) 0 .45px, transparent .65px),
    radial-gradient(circle at 78% 62%, rgba(255,255,255,.75) 0 .45px, transparent .7px);
  background-size: 5px 5px, 7px 7px;
  mix-blend-mode: multiply;
}

::selection { color: var(--paper); background: var(--red); }

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

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--red);
  outline-offset: 4px;
}

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 2000;
  padding: 10px 16px;
  color: var(--paper);
  background: var(--ink);
  transform: translateY(-150%);
  transition: transform .2s ease;
}

.skip-link:focus { transform: translateY(0); }
.shell { width: var(--shell); margin-inline: auto; }

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 100;
  background: rgba(243, 239, 229, .9);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(16px);
  transition: transform .35s ease, background-color .35s ease;
}

.site-header.is-hidden { transform: translateY(-100%); }

.header-grid {
  min-height: 78px;
  display: grid;
  grid-template-columns: 3fr 6fr 3fr;
  align-items: center;
}

.brand { display: inline-flex; align-items: center; gap: 13px; width: max-content; }
.brand-mark { width: 34px; height: 34px; }
.brand-name { font-family: var(--serif); font-size: 18px; font-weight: 700; letter-spacing: .14em; }

.site-nav { display: flex; justify-content: center; gap: clamp(24px, 3vw, 56px); }
.site-nav a { position: relative; font-size: 13px; letter-spacing: .08em; }
.site-nav a::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: -9px;
  left: 0;
  height: 1px;
  background: var(--red);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform .3s ease;
}
.site-nav a:hover::after,
.site-nav a:focus-visible::after { transform: scaleX(1); transform-origin: left; }

.header-action { justify-self: end; font-size: 13px; font-weight: 700; letter-spacing: .08em; }
.header-action span { display: inline-block; margin-left: 10px; color: var(--red); transition: transform .2s ease; }
.header-action:hover span { transform: translate(3px, -3px); }
.menu-toggle { display: none; }

.hero {
  min-height: 100svh;
  padding: 152px 0 52px;
  border-bottom: 1px solid var(--line);
}

.hero-grid {
  min-height: calc(100svh - 204px);
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  grid-template-rows: auto 1fr auto;
  column-gap: 24px;
}

.hero-index {
  grid-column: 1 / 4;
  color: var(--ink-soft);
  font-size: 10px;
  letter-spacing: .16em;
  text-transform: uppercase;
}

.hero-copy { grid-column: 1 / 8; grid-row: 2; align-self: center; padding: 54px 0; }
.eyebrow { margin: 0 0 24px; color: var(--red); font-size: 12px; font-weight: 700; letter-spacing: .18em; }

.hero h1,
.section-heading h2,
.method h2,
.about h2,
.cooperation h2 {
  margin: 0;
  font-family: var(--serif);
  font-weight: 500;
  letter-spacing: -.045em;
}

.hero h1 { font-size: clamp(54px, 6.2vw, 104px); line-height: .98; }
.hero h1 em,
.cooperation h2 em { color: var(--red); font-style: normal; }

.hero-intro {
  width: min(570px, 85%);
  margin: 40px 0 0 17%;
  padding-left: 24px;
  border-left: 1px solid var(--red);
}

.hero-intro > p { margin: 0; color: var(--ink-soft); font-size: 16px; line-height: 1.9; }
.hero-actions { display: flex; align-items: center; gap: 30px; margin-top: 30px; }

.button {
  min-height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 28px;
  padding: 0 21px;
  border: 1px solid var(--ink);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .08em;
  transition: background .25s ease, color .25s ease;
}
.button-primary { color: var(--paper); background: var(--ink); }
.button-primary:hover { background: var(--red); border-color: var(--red); }
.text-link { font-size: 13px; border-bottom: 1px solid var(--line); padding: 10px 0; }
.text-link span { margin-left: 8px; color: var(--red); }

.hero-visual {
  grid-column: 9 / 13;
  grid-row: 1 / 3;
  width: 100%;
  max-width: 480px;
  align-self: center;
  justify-self: end;
}

.orbit-board {
  position: relative;
  aspect-ratio: 1;
  border: 1px solid var(--line);
  overflow: hidden;
  background:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 25% 25%;
}

.axis { position: absolute; display: block; background: var(--ink); opacity: .55; }
.axis-h { top: 50%; left: 0; width: 100%; height: 1px; }
.axis-v { top: 0; left: 50%; width: 1px; height: 100%; }
.orbit { position: absolute; border: 1px solid var(--ink); border-radius: 50%; }
.orbit-one { inset: 20%; }
.orbit-two { inset: 6%; opacity: .2; }
.center-mark { position: absolute; top: calc(50% - 8px); left: calc(50% - 8px); width: 16px; height: 16px; background: var(--red); transform: rotate(45deg); }
.signal { position: absolute; width: 9px; height: 9px; background: var(--ink); border-radius: 50%; box-shadow: 0 0 0 8px rgba(23,23,20,.08); }
.signal-a { top: 19%; right: 26%; }
.signal-b { right: 18%; bottom: 26%; background: var(--red); box-shadow: 0 0 0 8px rgba(196,60,40,.1); }
.visual-label { position: absolute; padding: 6px 8px; background: var(--paper); font-size: 12px; letter-spacing: .12em; }
.visual-label b { margin-right: 5px; color: var(--red); font-size: 9px; }
.label-a { top: 9%; left: 5%; }
.label-b { top: 44%; right: 4%; }
.label-c { bottom: 8%; left: 6%; }
.label-d { top: 45%; left: 4%; }
.visual-caption { display: flex; justify-content: space-between; margin: 13px 0 0; color: var(--ink-soft); font-size: 10px; letter-spacing: .14em; }

.hero-note {
  grid-column: 9 / 13;
  grid-row: 3;
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: end;
  gap: 18px;
  justify-self: stretch;
  color: var(--ink-soft);
  font-family: var(--serif);
  font-size: 13px;
  line-height: 1.65;
  text-align: right;
}
.hero-note p { margin: 0; }
.note-line { height: 1px; margin-bottom: 5px; background: var(--line); }

.principles { border-bottom: 1px solid var(--line); }
.principles-grid { min-height: 168px; display: grid; grid-template-columns: 3fr 9fr; align-items: center; gap: 24px; }
.section-kicker { margin: 0; color: var(--red); font-size: 10px; font-weight: 700; letter-spacing: .18em; }
.principle-list { margin: 0; padding: 0; display: grid; grid-template-columns: repeat(4, 1fr); list-style: none; }
.principle-list li { min-height: 74px; display: flex; align-items: flex-end; gap: 15px; padding: 0 18px 10px; border-left: 1px solid var(--line); font-family: var(--serif); font-size: 17px; }
.principle-list span { color: var(--red); font-family: var(--sans); font-size: 9px; }

.section { padding: 150px 0; }
.section-heading { display: grid; grid-template-columns: 8fr 4fr; align-items: end; gap: 24px; margin-bottom: 84px; }
.section-heading h2,
.method h2,
.about h2 { margin-top: 27px; font-size: clamp(42px, 4.5vw, 72px); line-height: 1.13; }
.section-lead { max-width: 400px; margin: 0 0 8px; color: var(--ink-soft); font-size: 15px; line-height: 1.9; }

.service-list { border-top: 1px solid var(--ink); }
.service-card {
  display: grid;
  grid-template-columns: .7fr 1fr 3.3fr 2fr;
  gap: 24px;
  align-items: center;
  min-height: 245px;
  padding: 36px 0;
  border-bottom: 1px solid var(--line);
}
.service-number { align-self: start; color: var(--red); font-size: 11px; }
.service-icon { width: 68px; height: 68px; display: grid; place-items: center; border: 1px solid var(--line); transition: color .3s, background .3s, transform .3s; }
.service-icon svg { width: 42px; fill: none; stroke: currentColor; stroke-width: 1.2; }
.service-card:hover .service-icon { color: var(--paper); background: var(--red); transform: rotate(-4deg); }
.service-content h3 { margin: 0 0 18px; font-family: var(--serif); font-size: clamp(27px, 3vw, 42px); font-weight: 500; }
.service-content p { max-width: 600px; margin: 0; color: var(--ink-soft); font-size: 14px; line-height: 1.85; }
.service-card ul { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--line); }
.service-card li { padding: 11px 2px; border-bottom: 1px solid var(--line); color: var(--ink-soft); font-size: 12px; letter-spacing: .1em; }

.statement { position: relative; padding: 74px 0 128px; overflow: hidden; color: var(--paper); background: var(--ink); }
.statement::after { content: ""; position: absolute; right: -8vw; bottom: -18vw; width: 42vw; aspect-ratio: 1; border: 1px solid var(--line-light); border-radius: 50%; box-shadow: 0 0 0 7vw rgba(243,239,229,.025), 0 0 0 14vw rgba(243,239,229,.018); }
.statement-track { display: flex; align-items: center; gap: 45px; width: max-content; margin-left: -4vw; color: rgba(243,239,229,.08); font-family: var(--serif); font-size: clamp(62px, 9vw, 148px); white-space: nowrap; }
.statement-track i { width: 12px; height: 12px; background: var(--red); transform: rotate(45deg); }
.statement-grid { position: relative; z-index: 1; display: grid; grid-template-columns: 3fr 9fr; gap: 24px; margin-top: 92px; }
.statement blockquote { max-width: 960px; margin: 0; font-family: var(--serif); font-size: clamp(32px, 4.2vw, 66px); line-height: 1.35; letter-spacing: -.035em; }
.statement blockquote::before { content: "“"; color: var(--red); }

.method { background: var(--paper-deep); }
.method-grid { display: grid; grid-template-columns: 5fr 7fr; gap: clamp(50px, 8vw, 130px); }
.method-sticky { align-self: start; position: sticky; top: 130px; }
.method-sticky > p:last-child { max-width: 470px; margin: 35px 0 0; color: var(--ink-soft); font-size: 14px; line-height: 1.9; }
.method-steps { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--ink); }
.method-steps li { display: grid; grid-template-columns: 48px 1fr auto; gap: 20px; padding: 37px 0 42px; border-bottom: 1px solid var(--line); }
.step-index { color: var(--red); font-size: 10px; }
.method-steps h3 { margin: 0 0 14px; font-family: var(--serif); font-size: 27px; font-weight: 500; }
.method-steps p { max-width: 550px; margin: 0; color: var(--ink-soft); font-size: 13px; line-height: 1.8; }
.step-tag { align-self: start; padding: 7px 10px; border: 1px solid var(--line); border-radius: 20px; font-size: 10px; letter-spacing: .1em; white-space: nowrap; }

.capabilities { padding-bottom: 170px; }
.matrix { border-top: 1px solid var(--ink); border-bottom: 1px solid var(--ink); }
.matrix-row { display: grid; grid-template-columns: 1.15fr repeat(4, 1fr); border-bottom: 1px solid var(--line); }
.matrix-row:last-child { border-bottom: 0; }
.matrix-row > * { min-height: 76px; display: flex; align-items: center; padding: 16px 20px; border-left: 1px solid var(--line); font-size: 13px; }
.matrix-row > *:first-child { border-left: 0; }
.matrix-row b { font-family: var(--serif); font-size: 18px; font-weight: 500; }
.matrix-head > * { min-height: 54px; color: var(--ink-soft); font-size: 10px; font-weight: 700; letter-spacing: .14em; }
.matrix-row:not(.matrix-head) span::before { content: ""; width: 5px; height: 5px; margin-right: 10px; background: var(--red); border-radius: 50%; }

.about { color: var(--paper); background: var(--red); }
.about .section-kicker { color: var(--paper); opacity: .7; }
.about-grid { display: grid; grid-template-columns: 5fr 7fr; gap: clamp(50px, 8vw, 130px); }
.about-copy { padding-top: 51px; }
.about-copy > p { max-width: 690px; margin: 0 0 22px; color: var(--paper); font-size: 15px; line-height: 1.95; }
.about-copy .about-lead { color: var(--paper); font-family: var(--serif); font-size: clamp(23px, 2.4vw, 34px); line-height: 1.6; }
.about-values { display: grid; grid-template-columns: repeat(3, 1fr); margin: 64px 0 0; border-top: 1px solid var(--line-light); }
.about-values div { min-height: 135px; padding: 22px 18px; border-left: 1px solid var(--line-light); }
.about-values div:first-child { border-left: 0; }
.about-values dt { margin-bottom: 33px; font-family: var(--serif); font-size: 22px; }
.about-values dd { margin: 0; color: var(--paper); font-size: 11px; line-height: 1.7; }

.cooperation { position: relative; padding: 140px 0 40px; color: var(--paper); background: var(--ink); overflow: hidden; }
.cooperation::before { content: ""; position: absolute; top: -28vw; right: -10vw; width: 58vw; aspect-ratio: 1; border: 1px solid rgba(243,239,229,.08); border-radius: 50%; }
.cooperation-grid { position: relative; display: grid; grid-template-columns: repeat(12, 1fr); column-gap: 24px; }
.cooperation-grid > .section-kicker { grid-column: 1 / 4; color: var(--red); }
.cooperation-main { grid-column: 1 / 8; margin-top: 70px; }
.cooperation h2 { font-size: clamp(46px, 5.4vw, 84px); line-height: 1.16; }
.cooperation-main > p { max-width: 610px; margin: 38px 0 0; color: rgba(243,239,229,.65); font-size: 14px; line-height: 1.9; }
.cooperation-card { grid-column: 9 / 13; grid-row: 1 / 3; padding: 32px; color: var(--ink); background: var(--paper); }
.cooperation-card > p { margin: 0 0 32px; color: var(--red); font-size: 11px; font-weight: 700; letter-spacing: .14em; }
.cooperation-card ul { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--ink); }
.cooperation-card li { display: flex; gap: 14px; padding: 17px 0; border-bottom: 1px solid var(--line); font-family: var(--serif); font-size: 15px; }
.cooperation-card li span { color: var(--red); font-family: var(--sans); font-size: 9px; }
.copy-button { width: 100%; min-height: 54px; display: flex; justify-content: space-between; align-items: center; margin-top: 28px; padding: 0 17px; color: var(--paper); background: var(--red); border: 0; cursor: pointer; font-size: 12px; font-weight: 700; letter-spacing: .08em; transition: background .2s ease; }
.copy-button:hover { background: var(--red-dark); }
.copy-success { display: none; }
.copy-button.is-copied .copy-default { display: none; }
.copy-button.is-copied .copy-success { display: inline; }
.cooperation-foot { grid-column: 1 / 13; display: flex; justify-content: space-between; align-items: center; margin-top: 125px; padding-top: 27px; border-top: 1px solid var(--line-light); color: rgba(243,239,229,.6); font-size: 11px; letter-spacing: .12em; }
.cooperation-foot a { color: var(--paper); }
.cooperation-foot span { margin-left: 10px; color: var(--red); }

.matrix-hint { display: none; }
.reveal { opacity: 1; transform: none; }
.motion-ready .reveal { opacity: 0; transform: translateY(28px); transition: opacity .75s cubic-bezier(.22,1,.36,1), transform .75s cubic-bezier(.22,1,.36,1); }
.motion-ready .reveal.is-visible { opacity: 1; transform: translateY(0); }

@media (max-width: 1020px) {
  :root { --shell: min(100% - 40px, 900px); }
  .header-grid { grid-template-columns: 1fr auto; }
  .header-action { display: none; }
  .menu-toggle { display: inline-flex; align-items: center; gap: 14px; padding: 10px 0; background: transparent; border: 0; cursor: pointer; font-size: 12px; letter-spacing: .08em; }
  .menu-icon { width: 24px; display: grid; gap: 5px; }
  .menu-icon i { display: block; width: 100%; height: 1px; background: var(--ink); transition: transform .25s ease; }
  .menu-toggle[aria-expanded="true"] .menu-icon i:first-child { transform: translateY(3px) rotate(45deg); }
  .menu-toggle[aria-expanded="true"] .menu-icon i:last-child { transform: translateY(-3px) rotate(-45deg); }
  .site-nav { position: absolute; top: 78px; right: 0; left: 0; display: flex; flex-direction: column; gap: 0; padding: 16px 20px 26px; background: var(--paper); border-bottom: 1px solid var(--line); }
  .menu-ready .site-nav { display: none; }
  .menu-ready .site-nav.is-open { display: flex; }
  .site-nav a { width: 100%; padding: 17px 0; border-bottom: 1px solid var(--line); font-family: var(--serif); font-size: 19px; }
  .site-nav a::after { display: none; }
  .hero { min-height: auto; padding-top: 135px; }
  .hero-grid { min-height: auto; row-gap: 48px; }
  .hero-copy { grid-column: 1 / 9; }
  .hero-visual { grid-column: 9 / 13; }
  .hero-note { grid-column: 9 / 13; }
  .hero-intro { margin-left: 8%; }
  .service-card { grid-template-columns: .5fr .8fr 3.2fr 1.7fr; }
  .method-grid,
  .about-grid { gap: 60px; }
  .method-sticky { position: static; }
  .cooperation-main { grid-column: 1 / 8; }
}

@media (max-width: 760px) {
  :root { --shell: calc(100% - 32px); }
  html { scroll-padding-top: 72px; }
  .site-header { backdrop-filter: blur(10px); }
  .header-grid { min-height: 66px; }
  .brand-mark { width: 29px; height: 29px; }
  .brand-name { font-size: 15px; }
  .site-nav { top: 66px; }
  .hero { min-height: auto; padding: 112px 0 32px; }
  .hero-grid { display: block; }
  .hero-index { margin-bottom: 47px; }
  .hero-copy { padding: 0; }
  .hero h1 { font-size: clamp(48px, 14.8vw, 72px); line-height: 1.04; }
  .eyebrow { margin-bottom: 19px; }
  .hero-intro { width: 100%; margin: 32px 0 0; padding-left: 17px; }
  .hero-intro > p { font-size: 14px; line-height: 1.8; }
  .hero-actions { align-items: stretch; flex-direction: column; gap: 8px; }
  .button { width: 100%; justify-content: space-between; }
  .text-link { text-align: center; border: 0; }
  .hero-visual { width: min(100%, 430px); margin: 68px 0 0 auto; }
  .hero-note { display: none; }
  .principles-grid { display: block; padding: 38px 0 18px; }
  .principle-list { grid-template-columns: repeat(2, 1fr); margin-top: 26px; border-top: 1px solid var(--line); }
  .principle-list li { min-height: 72px; padding: 15px 4px 10px; border: 0; border-bottom: 1px solid var(--line); }
  .principle-list li:nth-child(even) { padding-left: 16px; border-left: 1px solid var(--line); }
  .section { padding: 96px 0; }
  .section-heading { display: block; margin-bottom: 51px; }
  .section-heading h2,
  .method h2,
  .about h2 { margin-top: 20px; font-size: clamp(39px, 11vw, 54px); }
  .section-lead { margin-top: 25px; }
  .service-card { grid-template-columns: 42px 1fr; gap: 20px 12px; min-height: 0; padding: 30px 0; }
  .service-number { grid-column: 1; }
  .service-icon { grid-column: 1; grid-row: 2; width: 42px; height: 42px; }
  .service-icon svg { width: 28px; }
  .service-content { grid-column: 2; grid-row: 1 / 3; }
  .service-content h3 { margin-bottom: 12px; }
  .service-card ul { grid-column: 2; display: flex; gap: 7px; border: 0; }
  .service-card li { padding: 6px 9px; border: 1px solid var(--line); border-radius: 20px; font-size: 9px; }
  .statement { padding: 45px 0 90px; }
  .statement-track { gap: 24px; font-size: 56px; }
  .statement-grid { display: block; margin-top: 70px; }
  .statement blockquote { margin-top: 28px; font-size: 31px; }
  .method-grid,
  .about-grid { display: block; }
  .method-sticky > p:last-child { margin-bottom: 55px; }
  .method-steps li { grid-template-columns: 34px 1fr; gap: 12px; padding: 28px 0; }
  .step-tag { display: none; }
  .matrix { overflow-x: auto; -webkit-overflow-scrolling: touch; }
  .matrix-hint { display: block; margin: -27px 0 16px; color: var(--ink-soft); font-size: 11px; }
  .matrix-row { min-width: 680px; }
  .matrix-row > * { min-height: 65px; padding: 12px; }
  .about-copy { padding-top: 45px; }
  .about-values { grid-template-columns: 1fr; margin-top: 45px; }
  .about-values div { min-height: auto; display: grid; grid-template-columns: 76px 1fr; align-items: center; padding: 17px 0; border-left: 0; border-bottom: 1px solid var(--line-light); }
  .about-values dt { margin: 0; }
  .cooperation { padding: 96px 0 30px; }
  .cooperation-grid { display: block; }
  .cooperation-main { margin-top: 45px; }
  .cooperation h2 { font-size: clamp(43px, 12vw, 60px); }
  .cooperation-card { margin-top: 60px; padding: 24px 20px; }
  .cooperation-foot { margin-top: 80px; gap: 20px; }
  .cooperation-foot p { max-width: 180px; margin: 0; line-height: 1.7; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
  .reveal { opacity: 1; transform: none; }
}