/* ============ Site grain background ============ */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  background:
    radial-gradient(1200px 600px at 80% -10%, rgba(184, 157, 139, 0.18), transparent 60%),
    radial-gradient(900px 500px at -10% 30%, rgba(140, 157, 142, 0.15), transparent 60%);
  pointer-events: none;
  z-index: 0;
}

main, header, footer { position: relative; z-index: 1; }

/* ============ Navigation ============ */
.site-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 50;
  padding: 18px 0;
  transition: backdrop-filter var(--dur-base) var(--ease-out),
              background-color var(--dur-base) var(--ease-out),
              border-color var(--dur-base) var(--ease-out),
              padding var(--dur-base) var(--ease-out);
  border-bottom: 1px solid transparent;
}
.site-nav.is-scrolled {
  background: var(--glass-strong);
  -webkit-backdrop-filter: saturate(180%) blur(18px);
  backdrop-filter: saturate(180%) blur(18px);
  border-bottom: 1px solid var(--line);
  padding: 12px 0;
}
.nav-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-5);
}
.brand {
  display: flex;
  align-items: baseline;
  gap: var(--sp-3);
  font-family: var(--font-display);
}
.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px; height: 28px;
  border: 1px solid var(--ink);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.02em;
  align-self: center;
}
.brand-name { font-size: var(--fs-md); letter-spacing: -0.01em; font-weight: 600; }
.brand-domain { font-size: var(--fs-xs); color: var(--ink-mute); letter-spacing: 0.06em; }

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--sp-7);
  list-style: none;
  margin: 0; padding: 0;
}
.nav-links a {
  font-size: var(--fs-sm);
  color: var(--ink-soft);
  letter-spacing: 0.02em;
  position: relative;
  padding: 4px 0;
}
.nav-links a::after {
  content: "";
  position: absolute;
  left: 0; right: 100%;
  bottom: 0;
  height: 1px;
  background: var(--ink);
  transition: right var(--dur-base) var(--ease-out);
}
.nav-links a:hover { color: var(--ink); }
.nav-links a:hover::after { right: 0; }

.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  padding: 10px 18px;
  border: 1px solid var(--ink);
  font-size: var(--fs-sm);
  background: var(--ink);
  color: var(--bg);
  transition: background var(--dur-fast) var(--ease-out), color var(--dur-fast) var(--ease-out);
}
.nav-cta:hover { background: transparent; color: var(--ink); }

.nav-toggle {
  display: none;
  width: 36px; height: 36px;
  border: 1px solid var(--line);
  align-items: center;
  justify-content: center;
}
.nav-toggle span,
.nav-toggle span::before,
.nav-toggle span::after {
  display: block;
  width: 16px; height: 1px;
  background: var(--ink);
  position: relative;
}
.nav-toggle span::before,
.nav-toggle span::after {
  content: "";
  position: absolute; left: 0;
}
.nav-toggle span::before { top: -5px; }
.nav-toggle span::after { top: 5px; }

/* ============ Hero ============ */
.hero {
  position: relative;
  padding-top: clamp(140px, 18vh, 220px);
  padding-bottom: var(--section-pad);
  overflow: hidden;
  isolation: isolate;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, transparent 60%, var(--bg) 100%);
  pointer-events: none;
  z-index: -1;
}

#cursor-glow {
  position: absolute;
  width: 600px; height: 600px;
  border-radius: 50%;
  pointer-events: none;
  background: radial-gradient(circle at center,
    rgba(140, 157, 142, 0.35) 0%,
    rgba(184, 157, 139, 0.18) 30%,
    transparent 60%);
  transform: translate(-50%, -50%);
  filter: blur(60px);
  opacity: 0;
  transition: opacity var(--dur-slow) var(--ease-out);
  z-index: -1;
}
.hero:hover #cursor-glow { opacity: 1; }

.hero-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-5);
  margin-bottom: var(--sp-7);
  font-size: var(--fs-xs);
  color: var(--ink-mute);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.hero-meta-row {
  display: flex;
  gap: var(--sp-6);
  flex-wrap: wrap;
}
.hero-meta-row span { display: inline-flex; align-items: center; gap: var(--sp-2); }
.hero-meta-row span::before {
  content: "";
  width: 6px; height: 6px;
  background: var(--accent-sage);
  border-radius: 50%;
}

.hero-title {
  font-size: var(--fs-3xl);
  max-width: 18ch;
  letter-spacing: -0.045em;
  font-weight: 500;
}
.hero-title .accent { color: var(--accent-sage); font-style: italic; font-weight: 400; }
.hero-title .clay { color: var(--accent-clay); font-style: italic; font-weight: 400; }

.hero-sub {
  margin-top: var(--sp-6);
  max-width: 56ch;
  font-size: var(--fs-md);
  color: var(--ink-soft);
  line-height: 1.65;
}

.hero-actions {
  margin-top: var(--sp-7);
  display: flex;
  gap: var(--sp-4);
  flex-wrap: wrap;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--sp-5);
  margin-top: var(--sp-10);
  padding-top: var(--sp-7);
  border-top: 1px solid var(--line);
}
.hero-stat-num {
  font-size: var(--fs-xl);
  font-weight: 500;
  letter-spacing: -0.02em;
  color: var(--ink);
}
.hero-stat-label {
  font-size: var(--fs-xs);
  color: var(--ink-mute);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-top: var(--sp-2);
}

/* ============ Section base ============ */
section.block {
  padding-top: var(--section-pad);
  padding-bottom: var(--section-pad);
  position: relative;
}
.section-head {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: var(--sp-7);
  align-items: end;
  margin-bottom: var(--sp-9);
}
.section-head .lead {
  font-size: var(--fs-md);
  color: var(--ink-soft);
  line-height: 1.65;
  max-width: 60ch;
}

/* ============ Capability strip ============ */
.capability-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.capability-cell {
  background: var(--bg);
  padding: var(--sp-7) var(--sp-5);
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
  transition: background var(--dur-base) var(--ease-out);
}
.capability-cell:hover { background: var(--bg-alt); }
.capability-cell .num {
  font-size: var(--fs-xs);
  color: var(--ink-mute);
  letter-spacing: 0.16em;
}
.capability-cell h4 { font-size: var(--fs-md); }
.capability-cell p { font-size: var(--fs-sm); color: var(--ink-soft); line-height: 1.6; }

/* ============ Solutions filterable grid ============ */
.solutions-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--sp-5);
  margin-bottom: var(--sp-7);
  padding: var(--sp-5) 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.toolbar-group {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  flex-wrap: wrap;
}
.toolbar-label {
  font-size: var(--fs-xs);
  color: var(--ink-mute);
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.solutions-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--sp-4);
}

/* ============ Approach (process) ============ */
.process-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--sp-2);
}
.process-row {
  display: grid;
  grid-template-columns: 80px 1fr 1.4fr 120px;
  align-items: center;
  gap: var(--sp-5);
  padding: var(--sp-6) var(--sp-3);
  border-bottom: 1px solid var(--line-soft);
  transition: background var(--dur-base) var(--ease-out), padding-left var(--dur-base) var(--ease-out);
}
.process-row:hover {
  background: var(--bg-alt);
  padding-left: var(--sp-5);
}
.process-row .num {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--ink-mute);
  letter-spacing: 0.18em;
}
.process-row h4 { font-size: var(--fs-md); }
.process-row p { color: var(--ink-soft); font-size: var(--fs-sm); }
.process-row .duration {
  text-align: right;
  font-size: var(--fs-xs);
  color: var(--ink-mute);
  letter-spacing: 0.08em;
}

/* ============ Why band ============ */
.why-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--sp-4);
}

/* ============ Contact ============ */
.contact-wrap {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-9);
  align-items: start;
}
.contact-info {
  display: grid;
  gap: var(--sp-5);
}
.contact-row {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: var(--sp-5);
  padding: var(--sp-4) 0;
  border-bottom: 1px solid var(--line-soft);
  font-size: var(--fs-sm);
}
.contact-row .k {
  color: var(--ink-mute);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  font-size: var(--fs-xs);
  padding-top: 4px;
}
.contact-row .v { color: var(--ink); line-height: 1.55; }
.contact-row .v a:hover { color: var(--accent-sage); }

/* ============ Footer ============ */
.site-footer {
  padding-top: var(--sp-9);
  padding-bottom: var(--sp-7);
  border-top: 1px solid var(--line);
  background: var(--bg-alt);
  font-size: var(--fs-sm);
  color: var(--ink-soft);
}
.footer-top {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: var(--sp-6);
  margin-bottom: var(--sp-8);
}
.footer-brand h4 {
  font-size: var(--fs-lg);
  margin-bottom: var(--sp-2);
}
.footer-brand .zh-sub {
  font-size: var(--fs-sm);
  color: var(--ink-mute);
  letter-spacing: 0.06em;
  margin-bottom: var(--sp-4);
}
.footer-col h5 {
  font-size: var(--fs-xs);
  color: var(--ink-mute);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  margin: 0 0 var(--sp-4) 0;
  font-weight: 500;
}
.footer-col ul { list-style: none; margin: 0; padding: 0; display: grid; gap: var(--sp-2); }
.footer-col a { color: var(--ink-soft); }
.footer-col a:hover { color: var(--ink); }

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--sp-4);
  padding-top: var(--sp-5);
  border-top: 1px solid var(--line);
  font-size: var(--fs-xs);
  color: var(--ink-mute);
  letter-spacing: 0.06em;
}