:root {
  --bg: #fafaf7;
  --paper: #ffffff;
  --ink: #1a1d1b;
  --ink-soft: #3a403d;
  --ink-mute: #7d8280;
  --line: rgba(26,29,27,0.12);
  --line-soft: rgba(26,29,27,0.06);
  --green: #2d4a3a;
  --green-soft: #5f7a6c;
  --accent: #2d4a3a;
  --maxw: 1080px;
  --serif: "Source Han Serif SC", "Noto Serif SC", "Songti SC", "STSong", "SimSun", Georgia, "Times New Roman", serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

.container {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 32px;
}

/* ---- Header ---- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(250, 250, 247, 0.82);
  backdrop-filter: saturate(1.4) blur(14px);
  border-bottom: 1px solid var(--line-soft);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
}
.brand-mark svg { display: block; }
.brand-text strong {
  display: block;
  font-family: var(--serif);
  font-size: 18px;
  letter-spacing: 3px;
  font-weight: 500;
  color: var(--green);
}
.brand-text small {
  display: block;
  font-size: 10.5px;
  letter-spacing: 2.5px;
  color: var(--ink-mute);
  text-transform: uppercase;
  margin-top: 2px;
}
.nav {
  display: flex;
  gap: 34px;
  font-size: 14px;
  color: var(--ink-soft);
  letter-spacing: 1px;
}
.nav a {
  padding: 4px 0;
  border-bottom: 1px solid transparent;
  transition: color .2s ease, border-color .2s ease;
}
.nav a:hover { color: var(--green); border-color: var(--green); }

.nav-toggle {
  display: none;
  width: 36px; height: 36px;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 4px;
  cursor: pointer;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
}
.nav-toggle span {
  display: block;
  width: 16px; height: 1.5px;
  background: var(--ink);
}

/* ---- Shared section ---- */
.section { padding: 120px 0; border-top: 1px solid var(--line-soft); }
.section-num {
  font-family: var(--serif);
  font-size: 12px;
  letter-spacing: 3px;
  color: var(--green);
  margin: 0 0 4px;
}
.section-tag {
  font-size: 11px;
  letter-spacing: 3.5px;
  text-transform: uppercase;
  color: var(--ink-mute);
  margin: 0 0 32px;
}
.section-head { max-width: 680px; margin-bottom: 56px; }
.section-head h2 { margin: 0; }

h2 {
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(26px, 3.4vw, 40px);
  line-height: 1.35;
  color: var(--ink);
  letter-spacing: 0.5px;
  margin: 0 0 20px;
}
h2 em { font-style: normal; color: var(--green); border-bottom: 1px solid var(--green); padding-bottom: 2px; }
h3 { margin: 0; }

.display {
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(32px, 5.4vw, 64px);
  line-height: 1.3;
  letter-spacing: 1px;
  color: var(--ink);
  margin: 0 0 28px;
}
.display .ink {
  color: var(--green);
  position: relative;
  padding: 0 2px;
}

/* ---- Hero ---- */
.hero {
  padding: 140px 0 120px;
  background:
    radial-gradient(60% 80% at 80% 10%, rgba(45,74,58,0.05), transparent 70%),
    linear-gradient(180deg, #fafaf7 0%, #f4f4ee 100%);
}
.eyebrow {
  font-size: 11.5px;
  letter-spacing: 4px;
  text-transform: uppercase;
  color: var(--green);
  margin: 0 0 28px;
  font-weight: 500;
}
.lede {
  font-size: 17px;
  color: var(--ink-soft);
  max-width: 620px;
  margin: 0 0 36px;
  line-height: 1.75;
}
.hero-meta {
  font-size: 13px;
  color: var(--ink-mute);
  letter-spacing: 1px;
}
.hero-meta .dot { margin: 0 12px; color: var(--line); }

/* ---- Philosophy / Method: two-col label layout ---- */
.philosophy-grid, .method-grid {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 80px;
  align-items: start;
}
.col-label .section-tag { margin: 0; }
.col-body p {
  color: var(--ink-soft);
  font-size: 16.5px;
  line-height: 1.85;
  margin: 0 0 16px;
  max-width: 640px;
}

/* ---- Capabilities ---- */
.cap-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  border-top: 1px solid var(--line);
}
.cap {
  padding: 36px 28px 36px 0;
  border-bottom: 1px solid var(--line);
  transition: padding .25s ease;
  position: relative;
}
.cap:nth-child(odd) { border-right: 1px solid var(--line); padding-right: 36px; }
.cap:nth-child(even) { padding-left: 36px; }
.cap:hover { padding-top: 32px; padding-bottom: 40px; }
.cap h3 {
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 500;
  color: var(--ink);
  margin-bottom: 10px;
  display: flex;
  align-items: baseline;
  gap: 12px;
  letter-spacing: 1px;
}
.cap h3 small {
  font-family: -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 11px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--ink-mute);
  font-weight: 400;
}
.cap p { margin: 0; color: var(--ink-soft); font-size: 15px; line-height: 1.75; }

/* ---- Method steps ---- */
.steps {
  list-style: none;
  padding: 0;
  margin: 0;
  counter-reset: step;
}
.steps li {
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: 24px;
  padding: 24px 0;
  border-top: 1px solid var(--line-soft);
}
.steps li:first-child { border-top: 1px solid var(--line); }
.steps li:last-child { border-bottom: 1px solid var(--line); }
.steps li strong {
  font-family: var(--serif);
  font-size: 20px;
  letter-spacing: 4px;
  font-weight: 500;
  color: var(--green);
}
.steps li span {
  color: var(--ink-soft);
  font-size: 15.5px;
  line-height: 1.8;
  max-width: 580px;
}

/* ---- Contact ---- */
.contact { background: #f2f1ea; }
.contact-inner { text-align: left; max-width: 820px; }
.contact .lede { margin-bottom: 48px; }
.contact-ways {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.contact-card {
  background: var(--paper);
  padding: 24px;
  border: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  gap: 6px;
  transition: transform .2s ease, border-color .2s ease;
}
a.contact-card:hover {
  transform: translateY(-2px);
  border-color: var(--green);
}
.contact-label {
  font-size: 11px;
  letter-spacing: 2.5px;
  text-transform: uppercase;
  color: var(--ink-mute);
}
.contact-value {
  font-size: 15.5px;
  color: var(--ink);
  font-family: var(--serif);
  letter-spacing: 0.5px;
}

/* ---- Footer ---- */
.site-footer {
  background: #1a1d1b;
  color: #b9bdb9;
  padding: 40px 0;
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}
.footer-brand-block {
  display: flex;
  gap: 14px;
  align-items: center;
}
.footer-mark svg rect, .footer-mark svg line { stroke: #8ca693; }
.footer-name {
  margin: 0;
  color: #ececea;
  font-family: var(--serif);
  letter-spacing: 2px;
  font-size: 15px;
}
.footer-en {
  margin: 3px 0 0;
  font-size: 12px;
  color: #7d8280;
  letter-spacing: 0.5px;
}
.footer-copy { margin: 0; font-size: 12.5px; letter-spacing: 1px; }

/* ---- Responsive ---- */
@media (max-width: 860px) {
  .philosophy-grid, .method-grid { grid-template-columns: 1fr; gap: 24px; }
  .cap-list { grid-template-columns: 1fr; }
  .cap, .cap:nth-child(odd), .cap:nth-child(even) {
    padding: 28px 0;
    border-right: none;
  }
  .contact-ways { grid-template-columns: 1fr; }
  .section { padding: 88px 0; }
  .hero { padding: 100px 0 88px; }
}
@media (max-width: 620px) {
  .container { padding: 0 24px; }
  .nav { display: none; }
  .nav-toggle { display: inline-flex; }
  .nav.open {
    display: flex;
    position: absolute;
    top: 72px; left: 0; right: 0;
    background: var(--paper);
    padding: 20px 28px;
    flex-direction: column;
    gap: 16px;
    border-bottom: 1px solid var(--line);
  }
  .steps li { grid-template-columns: 1fr; gap: 6px; }
  .hero-meta .dot { display: none; }
  .hero-meta span { display: block; margin: 4px 0; }
}