:root {
  --forest: #1a3c2b;
  --paper: #f7f7f5;
  --charcoal: #3a3a38;
  --coral: #ff8c69;
  --mint: #9effbf;
  --yellow: #f4d35e;
  --ink: #101613;
  --line: rgba(16, 22, 19, 0.68);
  --gutter: clamp(20px, 4vw, 64px);
  --sans: "Arial", "Microsoft YaHei", "PingFang SC", sans-serif;
  --mono: "Consolas", "SFMono-Regular", "Microsoft YaHei", monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--sans);
  line-height: 1.5;
}
a { color: inherit; }
img { display: block; width: 100%; }
button, input, textarea { font: inherit; }

.skip-link {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 30;
  padding: 10px 14px;
  color: var(--paper);
  background: var(--ink);
  transform: translateY(-110%);
}
.skip-link:focus { transform: translateY(0); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  min-height: 72px;
  display: grid;
  grid-template-columns: 70px minmax(210px, 1fr) auto 150px;
  align-items: stretch;
  background: var(--paper);
  border-bottom: 1px solid var(--line);
}
.concept-mark,
.source-entry {
  display: flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  border-right: 1px solid var(--line);
  font-family: var(--mono);
}
.concept-mark {
  color: var(--forest);
  font-size: 22px;
  font-weight: 800;
  letter-spacing: -0.08em;
}
.header-name {
  display: flex;
  align-items: center;
  padding: 0 24px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .04em;
}
.nav-links {
  display: flex;
  align-items: stretch;
}
.nav-links a {
  display: flex;
  align-items: center;
  padding: 0 18px;
  text-decoration: none;
  border-left: 1px solid transparent;
  border-right: 1px solid transparent;
  font-size: 12px;
}
.mobile-nav { display: none; position: relative; }
.mobile-nav summary {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  border-left: 1px solid var(--line);
  cursor: pointer;
  font-family: var(--mono);
  font-size: 11px;
  list-style: none;
}
.mobile-nav summary::-webkit-details-marker { display: none; }
.mobile-nav[open] summary { color: var(--paper); background: var(--forest); }
.mobile-nav nav {
  position: absolute;
  top: 100%;
  right: 0;
  width: min(280px, calc(100vw - 20px));
  display: grid;
  color: var(--paper);
  background: var(--forest);
  border: 1px solid var(--line);
}
.mobile-nav nav a {
  padding: 16px 20px;
  border-bottom: 1px solid rgba(247,247,245,.24);
  text-decoration: none;
  font-size: 13px;
}
.mobile-nav nav a:last-child { border-bottom: 0; }
.mobile-nav nav a:hover,
.mobile-nav nav a:focus-visible { color: var(--ink); background: var(--mint); }
.nav-links a:hover,
.nav-links a:focus-visible {
  color: var(--paper);
  background: var(--forest);
  border-color: var(--forest);
}
.source-entry {
  color: var(--paper);
  background: var(--forest);
  border-right: 0;
  border-left: 1px solid var(--line);
  gap: 12px;
  font-size: 12px;
}

.mosaic-section {
  display: grid;
  grid-template-columns: 70px minmax(0, 1fr);
  border-bottom: 1px solid var(--line);
  scroll-margin-top: 72px;
}
.section-no {
  padding-top: 24px;
  color: var(--paper);
  background: var(--forest);
  border-right: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 28px;
  font-weight: 700;
  text-align: center;
}
.section-body { min-width: 0; }
.section-intro {
  padding: clamp(34px, 5vw, 74px) var(--gutter);
  border-right: 1px solid var(--line);
}
.section-intro h2 {
  margin: 0 0 18px;
  font-size: clamp(34px, 4vw, 58px);
  line-height: .98;
  letter-spacing: -.045em;
}
.section-intro p {
  max-width: 36ch;
  margin: 0;
  color: color-mix(in srgb, currentColor 72%, transparent);
  font-size: 14px;
}
.dark-panel { color: var(--paper); background: var(--forest); }
.coral-panel { background: var(--coral); }
.mint-panel { background: var(--mint); }
.mono {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .06em;
  text-transform: uppercase;
}

.media {
  position: relative;
  min-width: 0;
  margin: 0;
  overflow: hidden;
  background: #fff;
}
.media img {
  height: 100%;
  object-fit: cover;
}
.hero-grid {
  min-height: calc(100vh - 72px);
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(430px, .95fr);
  grid-template-rows: 1fr auto;
}
.hero-copy {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: clamp(64px, 8vw, 132px) var(--gutter);
  color: var(--paper);
  background: var(--forest);
  border-right: 1px solid var(--line);
}
.hero h1 {
  margin: 0;
  font-size: clamp(62px, 6vw, 96px);
  line-height: .98;
  letter-spacing: -.075em;
}
.hero h1 span { display: block; white-space: nowrap; }
.hero h1 span:last-child { color: var(--mint); }
.hero-copy > p:not(.disclosure) {
  max-width: 610px;
  margin: 34px 0 0;
  color: rgba(247, 247, 245, .76);
  font-size: 16px;
}
.hero-actions {
  display: flex;
  align-items: center;
  gap: 24px;
  margin-top: 34px;
}
.button,
.text-link {
  min-height: 46px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  font-size: 13px;
  font-weight: 700;
}
.button { padding: 0 22px; border: 1px solid var(--paper); }
.button-light { color: var(--forest); background: var(--paper); }
.button-light:hover,
.button-light:focus-visible { color: var(--ink); background: var(--mint); }
.text-link { gap: 10px; border-bottom: 1px solid rgba(247,247,245,.6); }
.hero-media { min-height: 620px; }
.location-strip {
  grid-column: 1 / -1;
  min-height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--gutter);
  border-top: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .06em;
}

.product-grid {
  display: grid;
  grid-template-columns: .9fr 1.05fr .9fr 1.35fr;
  min-height: 650px;
}
.product-closeup,
.product-family { border-right: 1px solid var(--line); }
.product-records { display: grid; grid-template-rows: 1fr 1fr; border-right: 1px solid var(--line); }
.product-records article { padding: 34px 26px; }
.product-records article + article { border-top: 1px solid var(--line); }
.product-records h3 { margin: 34px 0 8px; font-size: 24px; }
.product-records p { margin: 0; color: #62625e; font-size: 12px; }

.application-grid {
  display: grid;
  grid-template-columns: .8fr 1.4fr 1.1fr;
  min-height: 520px;
}
.boundary-ledger {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-right: 1px solid var(--line);
}
.boundary-ledger article { padding: 36px 24px; border-right: 1px solid var(--line); }
.boundary-ledger article:last-child { border-right: 0; }
.boundary-ledger span { font-family: var(--mono); font-size: 12px; }
.boundary-ledger h3 { margin: 90px 0 10px; font-size: 20px; }
.boundary-ledger p { margin: 0; font-size: 12px; color: #62625e; }

.project-grid {
  display: grid;
  grid-template-columns: .75fr 1.25fr 1fr;
  min-height: 570px;
}
.project-record {
  padding: clamp(42px, 6vw, 86px) var(--gutter);
  border-right: 1px solid var(--line);
}
.project-record h3 { margin: 48px 0 22px; font-size: clamp(28px, 3vw, 46px); line-height: 1.1; letter-spacing: -.045em; }
.project-record p { max-width: 48ch; color: #62625e; font-size: 13px; }

.material-grid {
  display: grid;
  grid-template-columns: .75fr .9fr 1.55fr;
  min-height: 560px;
}
.process-ledger { display: grid; grid-template-rows: repeat(3, 1fr); border-right: 1px solid var(--line); }
.process-ledger article { padding: 24px 28px; border-bottom: 1px solid var(--line); }
.process-ledger article:last-child { border-bottom: 0; }
.process-ledger h3 { margin: 20px 0 5px; font-size: 19px; }
.process-ledger p { margin: 0; color: #62625e; font-size: 12px; }

.quality-grid {
  display: grid;
  grid-template-columns: .75fr 1.35fr 1.15fr;
  min-height: 560px;
}
.quality-ledger {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  border-right: 1px solid var(--line);
}
.quality-ledger article { padding: 28px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.quality-ledger article:nth-child(2n) { border-right: 0; }
.quality-ledger article:nth-last-child(-n+2) { border-bottom: 0; }
.quality-ledger span { font-family: var(--mono); font-size: 12px; }
.quality-ledger h3 { margin: 58px 0 6px; font-size: 20px; }
.quality-ledger p { margin: 0; color: #62625e; font-size: 12px; }

.development-grid {
  display: grid;
  grid-template-columns: .7fr 1.05fr 1.15fr .7fr;
  min-height: 650px;
}
.timeline-ledger { border-right: 1px solid var(--line); }
.timeline-ledger article { display: grid; grid-template-columns: 64px 1fr; gap: 20px; padding: 25px 28px; border-bottom: 1px solid var(--line); }
.timeline-ledger article:last-child { border-bottom: 0; }
.timeline-ledger time { color: var(--forest); font-family: var(--mono); font-size: 16px; font-weight: 800; }
.timeline-ledger p { margin: 0; font-size: 13px; }
.storage-media { border-right: 1px solid var(--line); }
.green-record { display: flex; flex-direction: column; justify-content: center; padding: 36px; color: var(--paper); background: var(--forest); }
.green-record strong { margin: 50px 0 8px; color: var(--mint); font-family: var(--mono); font-size: clamp(70px, 8vw, 116px); line-height: .8; letter-spacing: -.08em; }
.green-record p { font-size: 18px; font-weight: 700; }
.green-record small { margin-top: 24px; color: rgba(247,247,245,.7); }

.contact-grid {
  display: grid;
  grid-template-columns: .7fr 1.2fr 1.2fr;
}
.inquiry-form,
.source-ledger { padding: clamp(40px, 5vw, 72px) var(--gutter); border-right: 1px solid var(--line); }
.form-heading,
.source-heading { margin-bottom: 36px; }
.form-heading h3,
.source-heading h3 { margin: 10px 0 0; font-size: 32px; }
.inquiry-form { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.form-heading,
.field-wide,
.inquiry-form button,
.form-result { grid-column: 1 / -1; }
.inquiry-form label { display: grid; gap: 9px; font-family: var(--mono); font-size: 11px; }
.inquiry-form input,
.inquiry-form textarea {
  width: 100%;
  color: var(--ink);
  background: transparent;
  border: 0;
  border-bottom: 1px solid var(--line);
  outline: 0;
  padding: 12px 2px;
}
.inquiry-form textarea { border: 1px solid var(--line); padding: 12px; resize: vertical; }
.inquiry-form input:focus,
.inquiry-form textarea:focus { background: rgba(158,255,191,.22); }
.inquiry-form button {
  min-height: 50px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 18px;
  color: var(--paper);
  background: var(--forest);
  border: 0;
  cursor: pointer;
  font-size: 13px;
  font-weight: 700;
}
.inquiry-form button:hover,
.inquiry-form button:focus-visible { color: var(--ink); background: var(--mint); }
.form-result { min-height: 24px; margin: 0; color: var(--forest); font-size: 12px; }
.source-ledger { border-right: 0; }
.source-ledger ol { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--line); }
.source-ledger li { border-bottom: 1px solid var(--line); }
.source-ledger a { min-height: 54px; display: grid; grid-template-columns: 36px 1fr; align-items: center; text-decoration: none; font-size: 12px; }
.source-ledger a span { font-family: var(--mono); }
.source-ledger a:hover,
.source-ledger a:focus-visible { background: var(--mint); }
.source-ledger > p { margin: 26px 0 0; color: #62625e; font-size: 12px; }
.page-footer {
  grid-column: 1 / -1;
  min-height: 88px;
  display: grid;
  grid-template-columns: 70px 1fr auto;
  align-items: center;
  color: var(--paper);
  background: var(--forest);
  border-top: 1px solid var(--line);
}
.footer-mark { font-family: var(--mono); font-size: 20px; font-weight: 800; text-align: center; }
.page-footer p { margin: 0; padding: 0 24px; font-family: var(--mono); font-size: 11px; }
.page-footer a { align-self: stretch; display: flex; align-items: center; gap: 10px; padding: 0 28px; border-left: 1px solid rgba(247,247,245,.28); text-decoration: none; font-size: 12px; }
.page-footer a:hover,
.page-footer a:focus-visible { color: var(--ink); background: var(--mint); }

@media (max-width: 1100px) {
  .site-header { grid-template-columns: 64px 1fr 90px 130px; }
  .nav-links { display: none; }
  .mobile-nav { display: block; }
  .hero-grid { grid-template-columns: 1fr 44%; }
  .hero h1 { font-size: clamp(52px, 6.8vw, 78px); }
  .product-grid { grid-template-columns: .75fr 1fr 1fr; }
  .product-family { grid-column: 1 / -1; min-height: 400px; border-top: 1px solid var(--line); border-right: 0; }
  .application-grid,
  .project-grid,
  .material-grid,
  .quality-grid { grid-template-columns: .75fr 1.25fr; }
  .application-media,
  .project-media,
  .material-media,
  .quality-media { grid-column: 1 / -1; min-height: 460px; border-top: 1px solid var(--line); }
  .development-grid { grid-template-columns: .7fr 1.3fr; }
  .storage-media,
  .green-record { min-height: 480px; border-top: 1px solid var(--line); }
  .contact-grid { grid-template-columns: .7fr 1.3fr; }
  .source-ledger { grid-column: 1 / -1; border-top: 1px solid var(--line); }
}

@media (max-width: 720px) {
  .site-header { min-height: 62px; grid-template-columns: 54px 1fr 68px 104px; }
  .header-name { padding: 0 12px; font-size: 11px; }
  .source-entry { font-size: 10px; }
  .mosaic-section { grid-template-columns: 1fr; scroll-margin-top: 62px; }
  .section-no {
    min-height: 48px;
    display: flex;
    align-items: center;
    padding: 0 16px;
    border-right: 0;
    border-bottom: 1px solid var(--line);
    font-size: 20px;
    text-align: left;
  }
  .hero-grid,
  .product-grid,
  .application-grid,
  .project-grid,
  .material-grid,
  .quality-grid,
  .development-grid,
  .contact-grid { display: grid; grid-template-columns: 1fr; }
  .hero-copy { min-height: 540px; padding: 72px 22px 50px; border-right: 0; }
  .hero h1 { font-size: clamp(42px, 12vw, 54px); line-height: 1.02; }
  .hero-copy > p:not(.disclosure) { font-size: 14px; }
  .hero-actions { align-items: flex-start; flex-direction: column; gap: 14px; }
  .hero-media { min-height: 440px; border-top: 1px solid var(--line); }
  .location-strip { grid-column: auto; min-height: 70px; align-items: flex-start; flex-direction: column; justify-content: center; gap: 4px; padding: 0 20px; }
  .section-intro,
  .project-record,
  .inquiry-form,
  .source-ledger { padding: 42px 22px; border-right: 0; border-bottom: 1px solid var(--line); }
  .product-closeup,
  .product-records,
  .product-family,
  .boundary-ledger,
  .process-ledger,
  .quality-ledger,
  .timeline-ledger,
  .storage-media { border-right: 0; }
  .product-closeup,
  .product-family,
  .application-media,
  .project-media,
  .material-media,
  .quality-media,
  .storage-media { min-height: 360px; }
  .product-records article { min-height: 210px; }
  .boundary-ledger { grid-template-columns: 1fr; }
  .boundary-ledger article { min-height: 190px; border-right: 0; border-bottom: 1px solid var(--line); }
  .boundary-ledger article:last-child { border-bottom: 0; }
  .boundary-ledger h3 { margin-top: 50px; }
  .project-record h3 { font-size: 32px; }
  .process-ledger article { min-height: 160px; }
  .quality-ledger { grid-template-columns: 1fr 1fr; }
  .quality-ledger article { min-height: 180px; padding: 20px; }
  .quality-ledger h3 { margin-top: 40px; }
  .timeline-ledger article { grid-template-columns: 56px 1fr; padding: 22px; }
  .green-record { min-height: 400px; }
  .inquiry-form { grid-template-columns: 1fr; }
  .form-heading,
  .field-wide,
  .inquiry-form button,
  .form-result { grid-column: auto; }
  .page-footer { grid-template-columns: 54px 1fr; }
  .page-footer p { padding: 18px 14px; font-size: 9px; }
  .page-footer a { grid-column: 1 / -1; min-height: 52px; justify-content: space-between; border-top: 1px solid rgba(247,247,245,.28); border-left: 0; }
}

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