/* =========================================================
   慧客云科技 — 官网设计系统
   Ink + paper, one accent, editorial layout, no card mosaics
   ========================================================= */

:root {
  --bg: #f5f3ef;
  --bg-deep: #ebe8e1;
  --surface: #ffffff;
  --ink: #101114;
  --ink-2: #191b1f;
  --muted: #6d6a64;
  --muted-ink: #a8a59f;
  --line: #d9d5cc;
  --line-dark: rgba(245, 243, 239, 0.16);
  --accent: #2a3af0;
  --dark: #0b0c0e;
  --paper-on-dark: #f5f3ef;

  --font-sans: "PingFang SC", "HarmonyOS Sans SC", "Noto Sans SC",
    "Source Han Sans SC", "Microsoft YaHei", system-ui, -apple-system,
    "Segoe UI", sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", "JetBrains Mono", "Roboto Mono",
    "Cascadia Mono", Consolas, monospace;

  --gutter: clamp(20px, 5vw, 80px);
  --maxw: 1320px;
  --header-h: 78px;
  --section-y: clamp(76px, 10vw, 148px);

  --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

img {
  display: block;
  max-width: 100%;
}

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

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  cursor: pointer;
}

::selection {
  background: var(--accent);
  color: #fff;
}

/* ---------- layout primitives ---------- */

.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding-inline: var(--gutter);
}

.section {
  padding-block: var(--section-y);
}

.section--tight {
  padding-block: clamp(48px, 6vw, 92px);
}

.section--paper {
  background: var(--bg);
}

.section--white {
  background: var(--surface);
}

.section--deep {
  background: var(--bg-deep);
}

.section--dark {
  background: var(--dark);
  color: var(--paper-on-dark);
}

.rule {
  height: 1px;
  background: var(--line);
  border: 0;
  margin: 0;
}

/* ---------- type ---------- */

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
}

.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: currentColor;
  opacity: 0.55;
}

.eyebrow--accent {
  color: var(--accent);
}

.eyebrow--light {
  color: rgba(245, 243, 239, 0.62);
}

.display {
  margin: 0;
  font-size: clamp(42px, 7.2vw, 104px);
  font-weight: 700;
  line-height: 1.02;
  letter-spacing: -0.035em;
}

.h2 {
  margin: 0;
  font-size: clamp(30px, 4.4vw, 62px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.03em;
}

.h3 {
  margin: 0;
  font-size: clamp(22px, 2.1vw, 30px);
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: -0.02em;
}

.lede {
  margin: 0;
  font-size: clamp(16px, 1.25vw, 19px);
  line-height: 1.75;
  color: var(--muted);
  max-width: 46ch;
}

.lede--light {
  color: rgba(245, 243, 239, 0.68);
}

.small {
  font-size: 13px;
  line-height: 1.65;
  color: var(--muted);
}

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

.section-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 0.85fr);
  gap: clamp(24px, 5vw, 80px);
  align-items: end;
  padding-bottom: clamp(32px, 4vw, 56px);
  border-bottom: 1px solid var(--line);
}

.section-head--dark {
  border-color: var(--line-dark);
}

.section-head .eyebrow {
  grid-column: 1 / -1;
  margin-bottom: 18px;
}

.section-head .lede {
  justify-self: end;
  max-width: 40ch;
}

/* ---------- buttons / links ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  height: 52px;
  padding: 0 28px;
  border-radius: 2px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.02em;
  transition: background-color 0.35s var(--ease), color 0.35s var(--ease),
    transform 0.35s var(--ease), border-color 0.35s var(--ease);
}

.btn--dark {
  background: var(--ink);
  color: var(--paper-on-dark);
}

.btn--dark:hover {
  background: var(--accent);
}

.btn--light {
  background: var(--paper-on-dark);
  color: var(--ink);
}

.btn--light:hover {
  background: var(--accent);
  color: #fff;
}

.btn--ghost {
  border: 1px solid rgba(245, 243, 239, 0.34);
  color: var(--paper-on-dark);
}

.btn--ghost:hover {
  border-color: var(--paper-on-dark);
  background: rgba(245, 243, 239, 0.08);
}

.btn .arrow {
  display: inline-block;
  transition: transform 0.4s var(--ease);
}

.btn:hover .arrow {
  transform: translateX(4px);
}

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  font-weight: 600;
  padding-bottom: 4px;
  border-bottom: 1px solid currentColor;
  transition: color 0.3s var(--ease), gap 0.3s var(--ease);
}

.link-arrow:hover {
  color: var(--accent);
  gap: 16px;
}

.link-arrow--light:hover {
  color: #fff;
}

/* ---------- header ---------- */

.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 60;
  height: var(--header-h);
  display: flex;
  align-items: center;
  color: var(--paper-on-dark);
  transition: background-color 0.4s var(--ease), color 0.4s var(--ease),
    border-color 0.4s var(--ease), backdrop-filter 0.4s var(--ease);
  border-bottom: 1px solid transparent;
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  height: 100%;
}

.site-header.is-scrolled {
  background: rgba(245, 243, 239, 0.88);
  backdrop-filter: blur(14px) saturate(130%);
  -webkit-backdrop-filter: blur(14px) saturate(130%);
  color: var(--ink);
  border-bottom-color: var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex: none;
}

.brand-logo {
  height: 44px;
  width: auto;
  flex: none;
}

.brand-logo--color {
  display: none;
}

.site-header.is-scrolled .brand-logo--light {
  display: none;
}

.site-header.is-scrolled .brand-logo--color {
  display: block;
}

.nav {
  display: flex;
  align-items: center;
  gap: clamp(18px, 2.6vw, 40px);
  margin-left: auto;
}

.nav a {
  position: relative;
  font-size: 14px;
  font-weight: 500;
  opacity: 0.78;
  padding-block: 6px;
  transition: opacity 0.3s var(--ease);
}

.nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.45s var(--ease);
}

.nav a:hover,
.nav a.is-active {
  opacity: 1;
}

.nav a:hover::after,
.nav a.is-active::after {
  transform: scaleX(1);
  transform-origin: left;
}

.header-cta {
  flex: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 38px;
  padding: 0 18px;
  border: 1px solid currentColor;
  font-size: 13px;
  font-weight: 600;
  transition: background-color 0.35s var(--ease), color 0.35s var(--ease);
}

.site-header.is-scrolled .header-cta:hover {
  background: var(--ink);
  color: var(--paper-on-dark);
}

.site-header:not(.is-scrolled) .header-cta:hover {
  background: var(--paper-on-dark);
  color: var(--ink);
}

.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  place-items: center;
  flex: none;
}

.nav-toggle span {
  display: block;
  width: 20px;
  height: 1px;
  background: currentColor;
  position: relative;
  transition: transform 0.4s var(--ease), opacity 0.3s var(--ease);
}

.nav-toggle span::before {
  content: "";
  position: absolute;
  left: 0;
  top: -6px;
  width: 20px;
  height: 1px;
  background: currentColor;
  transition: transform 0.4s var(--ease);
}

/* mobile menu overlay */
.menu-panel {
  position: fixed;
  inset: 0;
  z-index: 70;
  background: var(--dark);
  color: var(--paper-on-dark);
  padding: calc(var(--header-h) + 24px) var(--gutter) 40px;
  display: flex;
  flex-direction: column;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: opacity 0.4s var(--ease), transform 0.4s var(--ease),
    visibility 0.4s;
}

.menu-panel.is-open {
  opacity: 1;
  visibility: visible;
  transform: none;
}

.menu-panel .menu-close {
  position: absolute;
  top: 20px;
  right: var(--gutter);
  font-size: 13px;
  letter-spacing: 0.08em;
  padding: 10px;
}

.menu-links {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-top: 8vh;
}

.menu-links a {
  font-size: clamp(28px, 7vw, 40px);
  font-weight: 600;
  letter-spacing: -0.02em;
  padding-block: 10px;
  border-bottom: 1px solid var(--line-dark);
}

.menu-foot {
  margin-top: auto;
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: rgba(245, 243, 239, 0.6);
  padding-top: 24px;
}

/* ---------- hero ---------- */

.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  overflow: hidden;
  background: #10131a;
  color: var(--paper-on-dark);
  isolation: isolate;
}

.hero-media {
  position: absolute;
  inset: 0;
  z-index: -2;
  will-change: transform;
}

.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  transform: scale(1.1);
}

.hero-scrim {
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(
      180deg,
      rgba(8, 9, 12, 0.58) 0%,
      rgba(8, 9, 12, 0.28) 38%,
      rgba(8, 9, 12, 0.72) 78%,
      rgba(8, 9, 12, 0.94) 100%
    ),
    linear-gradient(
      90deg,
      rgba(8, 9, 12, 0.72) 0%,
      rgba(8, 9, 12, 0.18) 62%,
      rgba(8, 9, 12, 0.42) 100%
    );
}

.hero-inner {
  padding-top: calc(var(--header-h) + 6vh);
  padding-bottom: clamp(40px, 6vh, 72px);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  flex: 1;
}

.hero-kicker {
  margin-bottom: clamp(22px, 3vh, 40px);
}

.hero .display {
  max-width: 15ch;
  font-size: clamp(46px, 8.4vw, 128px);
  line-height: 0.98;
}

.hero-sub {
  margin: clamp(22px, 3.4vh, 40px) 0 0;
  max-width: 42ch;
  font-size: clamp(15px, 1.3vw, 18px);
  line-height: 1.8;
  color: rgba(245, 243, 239, 0.74);
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 28px;
  margin-top: clamp(26px, 4vh, 48px);
  flex-wrap: wrap;
}

.hero-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding-bottom: 26px;
  border-top: 1px solid rgba(245, 243, 239, 0.18);
  padding-top: 18px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: rgba(245, 243, 239, 0.55);
  text-transform: uppercase;
}

.hero-foot .dotline {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
}

/* page hero (inner pages) */

.page-hero {
  position: relative;
  background: var(--dark);
  color: var(--paper-on-dark);
  padding-top: calc(var(--header-h) + clamp(70px, 10vh, 120px));
  padding-bottom: clamp(56px, 8vh, 96px);
  overflow: hidden;
}

.page-hero .hero-bg {
  position: absolute;
  inset: 0;
  opacity: 0.5;
  z-index: 0;
}

.page-hero .hero-bg img {
  width: 100%;
  height: 112%;
  object-fit: cover;
  object-position: center top;
}

.page-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    180deg,
    rgba(8, 9, 12, 0.82),
    rgba(8, 9, 12, 0.55) 55%,
    rgba(8, 9, 12, 0.95)
  );
  z-index: 1;
}

.page-hero .wrap {
  position: relative;
  z-index: 2;
}

.page-hero .display {
  font-size: clamp(38px, 5.6vw, 82px);
  max-width: 20ch;
  margin-top: 18px;
}

.page-hero .lede {
  margin-top: 26px;
  max-width: 52ch;
}

.page-hero .page-meta {
  display: flex;
  gap: 32px;
  flex-wrap: wrap;
  margin-top: clamp(36px, 6vh, 64px);
  padding-top: 20px;
  border-top: 1px solid var(--line-dark);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(245, 243, 239, 0.55);
}

/* ---------- stats ---------- */

.stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border-top: 1px solid var(--line);
}

.stat {
  padding: clamp(28px, 3.4vw, 46px) clamp(16px, 2vw, 28px);
  border-right: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.stat:last-child {
  border-right: 0;
}

.stat-num {
  font-family: var(--font-mono);
  font-size: clamp(34px, 4.6vw, 58px);
  font-weight: 500;
  line-height: 1;
  letter-spacing: -0.04em;
  font-variant-numeric: tabular-nums;
  display: flex;
  align-items: baseline;
}

.stat-num small {
  font-size: 0.42em;
  margin-left: 4px;
  letter-spacing: 0;
  color: var(--accent);
}

.stat-label {
  font-size: 13px;
  color: var(--muted);
  letter-spacing: 0.02em;
}

.stat--dark .stat-label {
  color: rgba(245, 243, 239, 0.55);
}

.stats--dark {
  border-color: var(--line-dark);
}

.stats--dark .stat {
  border-color: var(--line-dark);
}

/* ---------- service rows ---------- */

.rows {
  border-top: 1px solid var(--line);
}

.row {
  display: grid;
  grid-template-columns: 90px minmax(0, 1.15fr) minmax(0, 1.4fr) 60px;
  gap: clamp(16px, 2.4vw, 40px);
  align-items: start;
  padding: clamp(26px, 3.2vw, 44px) clamp(8px, 1.6vw, 24px);
  border-bottom: 1px solid var(--line);
  transition: background-color 0.4s var(--ease), padding 0.4s var(--ease);
  position: relative;
}

.row:hover {
  background: rgba(255, 255, 255, 0.55);
}

.row:hover .row-index {
  color: var(--accent);
}

.row-index {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
  transition: color 0.4s var(--ease);
  padding-top: 6px;
}

.row-title {
  font-size: clamp(19px, 1.65vw, 24px);
  font-weight: 600;
  letter-spacing: -0.015em;
  line-height: 1.35;
}

.row-desc {
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
  max-width: 46ch;
}

.row-arrow {
  justify-self: end;
  font-size: 18px;
  color: var(--muted);
  transition: transform 0.4s var(--ease), color 0.4s var(--ease);
}

.row:hover .row-arrow {
  color: var(--accent);
  transform: translate(4px, -4px);
}

/* ---------- split ---------- */

.split {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
  gap: clamp(28px, 5vw, 88px);
  align-items: center;
}

.split--reverse .split-media {
  order: 2;
}

.split-media {
  position: relative;
  overflow: hidden;
  background: var(--bg-deep);
  aspect-ratio: 4 / 3;
}

.split-media img {
  width: 100%;
  height: 112%;
  object-fit: cover;
  object-position: center top;
  transition: transform 1.4s var(--ease);
}

.split:hover .split-media img {
  transform: scale(1.03);
}

.split-copy {
  display: flex;
  flex-direction: column;
  gap: clamp(18px, 2.2vw, 28px);
}

.split-copy .h2 {
  max-width: 18ch;
}

.feature-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

.feature-list li {
  display: grid;
  grid-template-columns: 24px minmax(0, 1fr);
  gap: 14px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
  font-size: 14.5px;
  color: var(--muted);
}

.feature-list li b {
  color: var(--ink);
  font-weight: 600;
}

.feature-list li .idx {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--accent);
  padding-top: 4px;
}

/* ---------- cases ---------- */

.case-strip {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(20px, 3vw, 40px);
}

.case-strip .case-media {
  aspect-ratio: 4 / 3;
}

.featured-case {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
  gap: clamp(28px, 4.5vw, 72px);
  align-items: center;
}

.featured-case .case-copy {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.featured-case .case-copy .case-tag {
  align-self: flex-start;
}

.case-copy .link-arrow {
  align-self: flex-start;
}

.case-lead {
  font-size: clamp(26px, 2.6vw, 38px);
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: -0.02em;
  margin: 0;
}

.case-item {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.featured-case .case-media {
  aspect-ratio: 4 / 3;
}

.case-media {
  overflow: hidden;
  background: var(--bg-deep);
  position: relative;
}

.case-media img {
  width: 100%;
  height: 112%;
  object-fit: cover;
  object-position: center top;
  transition: transform 1.2s var(--ease);
}

.case-item:hover .case-media img {
  transform: scale(1.04);
}

.case-meta {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  border-top: 1px solid var(--line);
  padding-top: 14px;
}

.case-name {
  font-size: clamp(17px, 1.5vw, 21px);
  font-weight: 600;
  letter-spacing: -0.01em;
}

.case-tag {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  flex: none;
}

/* ---------- process ---------- */

.process {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  border-top: 1px solid var(--line-dark);
}

.step {
  padding: 24px 18px 0 0;
  border-right: 1px solid var(--line-dark);
  display: flex;
  flex-direction: column;
  gap: 12px;
  position: relative;
}

.step:last-child {
  border-right: 0;
}

.step-num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--muted-ink);
}

.step-title {
  font-size: 16px;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.step-desc {
  font-size: 12.5px;
  line-height: 1.7;
  color: rgba(245, 243, 239, 0.55);
}

.process--light {
  border-color: var(--line);
}

.process--light .step {
  border-color: var(--line);
}

.process--light .step-desc {
  color: var(--muted);
}

.process--light .step-num {
  color: var(--accent);
}

/* ---------- client / trust ---------- */

.trust {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.4fr);
  gap: clamp(28px, 5vw, 80px);
  align-items: start;
}

.logo-words {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 clamp(24px, 4vw, 64px);
  border-top: 1px solid var(--line-dark);
}

.logo-words div {
  padding: 16px 0;
  border-bottom: 1px solid var(--line-dark);
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0.01em;
  color: rgba(245, 243, 239, 0.82);
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.logo-words div span {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  color: rgba(245, 243, 239, 0.4);
}

.logo-words--light {
  border-color: var(--line);
}

.logo-words--light div {
  border-color: var(--line);
  color: var(--ink);
}

.logo-words--light div span {
  color: var(--muted);
}

/* ---------- CTA ---------- */

.cta {
  position: relative;
  background: var(--dark);
  color: var(--paper-on-dark);
  overflow: hidden;
  padding-block: clamp(72px, 11vw, 150px);
}

.cta-bg {
  position: absolute;
  inset: 0;
  opacity: 0.42;
  z-index: 0;
}

.cta-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.cta::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(
    100deg,
    rgba(8, 9, 12, 0.94) 10%,
    rgba(8, 9, 12, 0.6) 60%,
    rgba(8, 9, 12, 0.9) 100%
  );
}

.cta .wrap {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
  gap: clamp(32px, 5vw, 80px);
  align-items: end;
}

.cta .display {
  font-size: clamp(36px, 5.4vw, 78px);
  max-width: 16ch;
}

.cta-side {
  display: flex;
  flex-direction: column;
  gap: 18px;
  align-items: flex-start;
  padding-bottom: 6px;
}

.cta-phone {
  font-family: var(--font-mono);
  font-size: clamp(30px, 3.4vw, 44px);
  letter-spacing: -0.02em;
  line-height: 1.1;
}

.cta-phone span {
  display: block;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  color: rgba(245, 243, 239, 0.5);
  margin-bottom: 10px;
}

.cta--light {
  background: var(--bg);
  color: var(--ink);
  padding-block: clamp(70px, 10vw, 132px);
}

.cta--light::after,
.cta--light .cta-bg {
  display: none;
}

.cta--light .cta-phone {
  color: var(--ink);
}

.cta--light .cta-phone span {
  color: var(--muted);
}

/* ---------- footer ---------- */

.site-footer {
  background: var(--dark);
  color: var(--paper-on-dark);
  padding-top: clamp(56px, 7vw, 90px);
  padding-bottom: 34px;
  border-top: 1px solid var(--line-dark);
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) repeat(2, minmax(0, 0.7fr));
  gap: clamp(28px, 5vw, 72px);
  padding-bottom: clamp(40px, 6vw, 70px);
}

.footer-brand .brand-logo {
  height: 52px;
}

.footer-brand p {
  margin: 22px 0 0;
  font-size: 13.5px;
  line-height: 1.9;
  color: rgba(245, 243, 239, 0.55);
  max-width: 34ch;
}

.footer-col h4 {
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(245, 243, 239, 0.42);
}

.footer-col ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-col a,
.footer-col li {
  font-size: 13.5px;
  color: rgba(245, 243, 239, 0.72);
  transition: color 0.3s var(--ease);
}

.footer-col a:hover {
  color: #fff;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
  padding-top: 22px;
  border-top: 1px solid var(--line-dark);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: rgba(245, 243, 239, 0.38);
}

.footer-bottom a:hover {
  color: rgba(245, 243, 239, 0.75);
}

/* ---------- about page components ---------- */

.intro-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.35fr);
  gap: clamp(28px, 5vw, 90px);
  align-items: start;
}

.statement {
  font-size: clamp(24px, 2.6vw, 36px);
  font-weight: 600;
  line-height: 1.45;
  letter-spacing: -0.02em;
  margin: 0;
  max-width: 22ch;
}

.statement em {
  font-style: normal;
  color: var(--accent);
}

.prose {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.prose p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.95;
  color: var(--muted);
  max-width: 62ch;
}

.prose p strong {
  color: var(--ink);
  font-weight: 600;
}

.brand-matrix {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border-top: 1px solid var(--line);
}

.matrix-item {
  padding: 30px 24px 34px 0;
  border-right: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.matrix-item:last-child {
  border-right: 0;
  padding-right: 0;
}

.matrix-item .idx {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.1em;
  color: var(--accent);
}

.matrix-item h3 {
  margin: 0;
  font-size: 20px;
  font-weight: 600;
  letter-spacing: -0.015em;
}

.matrix-item p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--muted);
}

.matrix-item ul {
  list-style: none;
  margin: 4px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.matrix-item ul li {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.04em;
  color: var(--muted);
  border: 1px solid var(--line);
  padding: 3px 8px;
}

.team-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: clamp(28px, 4vw, 48px);
  border-top: 1px solid var(--line);
}

.team-stat {
  padding: clamp(26px, 3vw, 42px) 24px clamp(22px, 2.6vw, 34px) 0;
  border-right: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.team-stat:last-child {
  border-right: 0;
  padding-right: 0;
}

.team-roles {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  column-gap: clamp(24px, 4vw, 64px);
  margin-top: clamp(32px, 4vw, 56px);
  border-top: 1px solid var(--line);
}

.team-role {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 22px 0 26px;
  border-bottom: 1px solid var(--line);
}

.team-role .r-role {
  font-size: 16px;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.team-role .r-desc {
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--muted);
}

.patents {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 clamp(24px, 4vw, 60px);
}

.patent {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
  font-size: 14px;
}

.patent span {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.promise-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(24px, 4vw, 64px) clamp(28px, 5vw, 80px);
}

.promise h3 {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 600;
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.promise h3 span {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.1em;
  color: var(--accent);
}

.promise p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.85;
  color: var(--muted);
}

.timeline {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--line);
}

.tl-item {
  display: grid;
  grid-template-columns: 110px minmax(0, 1fr);
  gap: clamp(16px, 3vw, 48px);
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
  align-items: baseline;
}

.tl-year {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--accent);
}

.tl-text {
  font-size: 15px;
  color: var(--muted);
  max-width: 62ch;
}

.tl-text b {
  color: var(--ink);
  font-weight: 600;
}

/* ---------- products page ---------- */

.product-section {
  padding-block: clamp(60px, 8vw, 110px);
  border-top: 1px solid var(--line);
}

.product-head {
  display: grid;
  grid-template-columns: 88px minmax(0, 1fr) minmax(0, 0.9fr);
  gap: clamp(20px, 3vw, 48px);
  align-items: start;
  margin-bottom: clamp(32px, 4.4vw, 56px);
}

.product-head .idx {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--accent);
  padding-top: 12px;
}

.product-head .h2 {
  max-width: 16ch;
  font-size: clamp(28px, 3.4vw, 44px);
}

.product-head .lede {
  justify-self: end;
  font-size: 14.5px;
  max-width: 42ch;
}

.version-list {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--line);
}

.version {
  display: grid;
  grid-template-columns: minmax(0, 0.5fr) minmax(0, 1.6fr) 120px;
  gap: clamp(16px, 2.6vw, 40px);
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
  align-items: baseline;
}

.version .v-name {
  font-size: 16px;
  font-weight: 600;
}

.version .v-desc {
  font-size: 13.5px;
  color: var(--muted);
  line-height: 1.8;
}

.version .v-tag {
  justify-self: end;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.system-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border-top: 1px solid var(--line);
}

.system-item {
  padding: 24px 20px 26px 0;
  border-bottom: 1px solid var(--line);
  border-right: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.system-item:nth-child(4n) {
  border-right: 0;
  padding-right: 0;
}

.system-item .s-name {
  font-size: 15px;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.system-item .s-note {
  font-size: 12.5px;
  color: var(--muted);
  line-height: 1.7;
}

.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.chip {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.03em;
  color: var(--muted);
  border: 1px solid var(--line);
  padding: 5px 10px;
  transition: border-color 0.3s var(--ease), color 0.3s var(--ease);
}

.chip:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.cap-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(20px, 3vw, 40px);
}

.cap h4 {
  margin: 0 0 8px;
  font-size: 15px;
  font-weight: 600;
}

.cap p {
  margin: 0;
  font-size: 13.5px;
  color: var(--muted);
  line-height: 1.8;
}

.industry-row {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  border-top: 1px solid var(--line);
}

.industry {
  padding: 20px 16px 22px 0;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.industry:last-child {
  border-right: 0;
}

.industry .i-name {
  font-size: 14.5px;
  font-weight: 600;
}

.industry .i-note {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.04em;
  color: var(--muted);
  margin-top: 6px;
}

/* ---------- contact ---------- */

.contact-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
  gap: clamp(40px, 7vw, 110px);
  align-items: start;
}

.contact-facts {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--line);
}

.fact {
  display: grid;
  grid-template-columns: 110px minmax(0, 1fr);
  gap: 24px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
  align-items: baseline;
}

.fact .f-label {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}

.fact .f-value {
  font-size: 15px;
  line-height: 1.7;
}

.fact .f-value a:hover {
  color: var(--accent);
}

.fact .f-value b {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 500;
  letter-spacing: -0.02em;
}

.address-display {
  margin: 0;
  font-size: clamp(24px, 2.6vw, 36px);
  font-weight: 600;
  line-height: 1.45;
  letter-spacing: -0.02em;
  padding-left: 18px;
  border-left: 2px solid var(--accent);
}

.faq {
  border-top: 1px solid var(--line);
}

.faq-item {
  border-bottom: 1px solid var(--line);
}

.faq-q {
  width: 100%;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 24px;
  padding: 20px 0;
  text-align: left;
  font-size: 15.5px;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.faq-q .plus {
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--muted);
  transition: transform 0.35s var(--ease), color 0.35s var(--ease);
  flex: none;
}

.faq-item.is-open .faq-q .plus {
  transform: rotate(45deg);
  color: var(--accent);
}

.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.45s var(--ease);
}

.faq-a p {
  margin: 0 0 20px;
  font-size: 13.5px;
  line-height: 1.9;
  color: var(--muted);
  max-width: 62ch;
}

.map-band {
  position: relative;
  height: clamp(240px, 36vw, 440px);
  overflow: hidden;
  background: var(--dark);
}

.map-band img {
  width: 100%;
  height: 112%;
  object-fit: cover;
  object-position: center top;
  opacity: 0.55;
}

.map-label {
  position: absolute;
  left: var(--gutter);
  bottom: 28px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--paper-on-dark);
  mix-blend-mode: difference;
}

/* ---------- motion ---------- */

[data-reveal] {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.9s var(--ease), transform 0.9s var(--ease);
  will-change: opacity, transform;
}

[data-reveal].is-in {
  opacity: 1;
  transform: none;
}

[data-reveal-delay="1"] {
  transition-delay: 0.08s;
}
[data-reveal-delay="2"] {
  transition-delay: 0.16s;
}
[data-reveal-delay="3"] {
  transition-delay: 0.24s;
}
[data-reveal-delay="4"] {
  transition-delay: 0.32s;
}

.hero-inner > * {
  animation: heroIn 1.15s var(--ease) both;
}

.hero-inner > *:nth-child(1) {
  animation-delay: 0.15s;
}
.hero-inner > *:nth-child(2) {
  animation-delay: 0.3s;
}
.hero-inner > *:nth-child(3) {
  animation-delay: 0.45s;
}
.hero-inner > *:nth-child(4) {
  animation-delay: 0.58s;
}

@keyframes heroIn {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .hero-inner > * {
    animation: none;
  }
  .split:hover .split-media img,
  .case-item:hover .case-media img {
    transform: none;
  }
}

/* ---------- responsive ---------- */

@media (max-width: 1080px) {
  .nav {
    gap: 22px;
  }
  .section-head {
    grid-template-columns: 1fr;
    align-items: start;
  }
  .section-head .lede {
    justify-self: start;
    max-width: 52ch;
  }
  .row {
    grid-template-columns: 60px minmax(0, 1fr) 40px;
  }
  .row-desc {
    grid-column: 2 / 3;
  }
  .row-arrow {
    grid-row: 1 / span 2;
  }
  .process {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .step {
    border-bottom: 1px solid var(--line-dark);
    padding-bottom: 22px;
  }
  .step:nth-child(3n) {
    border-right: 0;
  }
  .brand-matrix {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .matrix-item:nth-child(2n) {
    border-right: 0;
    padding-right: 0;
  }
  .matrix-item:nth-child(-n + 2) {
    border-bottom: 1px solid var(--line);
  }
  .system-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .system-item:nth-child(3n) {
    border-right: 0;
    padding-right: 0;
  }
  .system-item:nth-child(4n) {
    border-right: 1px solid var(--line);
    padding-right: 20px;
  }
  .industry-row {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .industry:nth-child(3n) {
    border-right: 0;
  }
  .product-head {
    grid-template-columns: 60px minmax(0, 1fr);
  }
  .product-head .lede {
    grid-column: 2 / 3;
    justify-self: start;
    max-width: 60ch;
  }
}

@media (max-width: 900px) {
  :root {
    --header-h: 68px;
  }
  .nav,
  .header-cta {
    display: none;
  }
  .nav-toggle {
    display: grid;
  }
  .hero-foot {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }
  .stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .stat {
    border-bottom: 1px solid var(--line);
  }
  .stat:nth-child(2n) {
    border-right: 0;
  }
  .split {
    grid-template-columns: 1fr;
  }
  .split--reverse .split-media {
    order: 0;
  }
  .featured-case {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  .case-strip {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .cta .wrap {
    grid-template-columns: 1fr;
    align-items: start;
  }
  .process {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .step:nth-child(3n) {
    border-right: 1px solid var(--line-dark);
  }
  .step:nth-child(2n) {
    border-right: 0;
  }
  .footer-top {
    grid-template-columns: 1fr 1fr;
  }
  .footer-brand {
    grid-column: 1 / -1;
  }
  .intro-grid {
    grid-template-columns: 1fr;
  }
  .team-roles {
    grid-template-columns: 1fr;
  }
  .cap-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .contact-layout {
    grid-template-columns: 1fr;
  }
  .trust {
    grid-template-columns: 1fr;
  }
  .patents {
    grid-template-columns: 1fr;
  }
  .promise-grid {
    grid-template-columns: 1fr;
  }
  .system-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .system-item:nth-child(3n) {
    border-right: 1px solid var(--line);
    padding-right: 20px;
  }
  .system-item:nth-child(2n) {
    border-right: 0;
    padding-right: 0;
  }
  .industry-row {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .industry:nth-child(3n) {
    border-right: 1px solid var(--line);
  }
  .industry:nth-child(2n) {
    border-right: 0;
  }
}

@media (max-width: 600px) {
  body {
    font-size: 15px;
  }
  .hero .display {
    font-size: clamp(40px, 12vw, 58px);
  }
  .row {
    grid-template-columns: 1fr 32px;
    gap: 8px;
  }
  .row-index {
    grid-column: 1 / -1;
    padding-top: 0;
  }
  .row-title {
    grid-column: 1 / 2;
  }
  .row-desc {
    grid-column: 1 / 2;
  }
  .row-arrow {
    grid-row: 2 / span 2;
    align-self: start;
  }
  .process {
    grid-template-columns: 1fr;
  }
  .step {
    border-right: 0;
  }
  .team-stat {
    padding-right: 12px;
  }
  .cap-list {
    grid-template-columns: 1fr;
  }
  .system-grid {
    grid-template-columns: 1fr;
  }
  .system-item,
  .system-item:nth-child(2n),
  .system-item:nth-child(3n),
  .system-item:nth-child(4n) {
    border-right: 0;
    padding-right: 0;
  }
  .industry-row {
    grid-template-columns: 1fr;
  }
  .industry,
  .industry:nth-child(2n),
  .industry:nth-child(3n) {
    border-right: 0;
  }
  .case-strip {
    grid-template-columns: 1fr;
  }
  .version {
    grid-template-columns: 1fr;
    gap: 6px;
  }
  .version .v-tag {
    justify-self: start;
  }
  .stat-num {
    font-size: 36px;
  }
  .hero-actions {
    gap: 18px;
  }
  .tl-item {
    grid-template-columns: 1fr;
    gap: 6px;
  }
  .fact {
    grid-template-columns: 1fr;
    gap: 4px;
  }
}