:root {
  --ink: #162e3c;
  --ink-raised: #23465a;
  --paper: #e8efed;
  --paper-bright: #f3e4d1;
  --brand-blue: #315670;
  --acorn: #f3ce9a;
  --aqua: #6bbfbf;
  --chestnut: #d09a68;
  --light-text: #f8f4ee;
  --dark-text: #1e3440;
  --light-muted: rgba(248, 244, 238, 0.68);
  --ease-out: cubic-bezier(.22, 1, .36, 1);
  --header-height: 76px;
  --shell: min(1240px, calc(100vw - 96px));
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
  background: var(--ink);
}

body {
  margin: 0;
  color: var(--light-text);
  background: var(--ink);
  font-family: "Avenir Next", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  overflow-x: hidden;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

body.menu-open { overflow: hidden; }
img, svg { display: block; }
img { max-width: 100%; height: auto; }
a { color: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
button { font: inherit; }
::selection { color: var(--ink); background: var(--acorn); }

.scroll-progress {
  position: fixed;
  z-index: 1100;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  pointer-events: none;
  background: var(--aqua);
  transform: scaleX(0);
  transform-origin: left center;
}

.site-header {
  --header-ink: var(--light-text);
  --header-line: rgba(247, 246, 241, 0.16);
  position: fixed;
  z-index: 1000;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  padding: 0 48px;
  color: var(--header-ink);
  border-bottom: 1px solid transparent;
  transition: color .35s var(--ease-out), background-color .35s var(--ease-out), border-color .35s var(--ease-out);
}

.site-header[data-theme="light"] {
  --header-ink: var(--dark-text);
  --header-line: rgba(32, 35, 52, 0.14);
}

.site-header.is-scrolled {
  background: var(--ink);
  border-color: rgba(247, 246, 241, 0.12);
  color: var(--light-text);
}

.site-header.is-scrolled[data-theme="light"] {
  background: var(--paper);
  border-color: rgba(32, 35, 52, 0.12);
  color: var(--dark-text);
}

.header-brand {
  position: relative;
  z-index: 2;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  justify-self: start;
  color: inherit;
  text-decoration: none;
  transition: transform .35s var(--ease-out);
}

.header-brand:hover { transform: translateY(-2px); }

.header-brand:focus-visible,
.site-nav a:focus-visible,
.menu-toggle:focus-visible,
.download-button:focus-visible,
.tab-button:focus-visible,
.contact-list a:focus-visible,
.scroll-cue:focus-visible,
.footer a:focus-visible {
  outline: 3px solid var(--acorn);
  outline-offset: 4px;
}

.header-brand img {
  flex: 0 0 auto;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  clip-path: circle(48.5% at 50% 50%);
  object-fit: cover;
  box-shadow: 0 4px 8px rgba(8, 25, 34, .22);
}

.header-brand span {
  font-size: 15px;
  font-weight: 650;
  letter-spacing: .06em;
  white-space: nowrap;
}

.site-nav { grid-column: 2; }
.site-nav ul {
  display: flex;
  align-items: center;
  gap: clamp(24px, 3vw, 48px);
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-nav a {
  position: relative;
  display: block;
  padding: 7px 0 9px;
  color: inherit;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: .02em;
  text-decoration: none;
  opacity: .66;
  transition: opacity .25s ease;
}

.site-nav a::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  height: 2px;
  background: var(--aqua);
  transform: scaleX(0);
  transform-origin: right center;
  transition: transform .4s var(--ease-out);
}

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

.menu-toggle {
  position: relative;
  z-index: 2;
  display: none;
  justify-self: end;
  width: 42px;
  height: 42px;
  padding: 0;
  color: inherit;
  background: transparent;
  border: 0;
  cursor: pointer;
}

.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  margin-left: auto;
  background: currentColor;
  transition: transform .35s var(--ease-out), width .35s var(--ease-out);
}

.menu-toggle span + span {
  width: 17px;
  margin-top: 7px;
}

.menu-toggle[aria-expanded="true"] { color: var(--light-text); }
.menu-toggle[aria-expanded="true"] span:first-child {
  width: 24px;
  transform: translateY(4.5px) rotate(45deg);
}
.menu-toggle[aria-expanded="true"] span:last-child {
  width: 24px;
  transform: translateY(-4.5px) rotate(-45deg);
}

.section {
  position: relative;
  min-height: 100svh;
  overflow: clip;
  scroll-margin-top: var(--header-height);
}

.section-shell {
  position: relative;
  z-index: 2;
  width: var(--shell);
  min-height: 100svh;
  margin: 0 auto;
}

.hero {
  isolation: isolate;
  background: var(--ink);
}

.hero::before {
  content: "";
  position: absolute;
  z-index: -2;
  top: 0;
  right: 0;
  width: 41vw;
  height: 100%;
  background: #1f4356;
}

.hero::after {
  content: "";
  position: absolute;
  z-index: -1;
  right: clamp(40px, 7vw, 120px);
  bottom: clamp(24px, 7vh, 90px);
  width: clamp(140px, 16vw, 260px);
  height: 10px;
  background: var(--acorn);
}

.hero-orbit {
  position: absolute;
  z-index: -1;
  top: 52%;
  right: -9vw;
  width: min(62vw, 900px);
  aspect-ratio: 1;
  border: 1px solid rgba(107, 191, 191, .28);
  border-radius: 50%;
  transform: translateY(-50%);
}
.hero-orbit::before,
.hero-orbit::after {
  content: "";
  position: absolute;
  border: 1px solid rgba(107, 191, 191, .16);
  border-radius: 50%;
}
.hero-orbit::before { inset: 12%; }
.hero-orbit::after { inset: 26%; }

.hero-shell {
  display: grid;
  grid-template-columns: minmax(320px, .78fr) minmax(520px, 1.22fr);
  align-items: center;
  gap: clamp(24px, 5vw, 88px);
  padding-top: var(--header-height);
}

.hero-copy {
  position: relative;
  z-index: 3;
  padding-left: clamp(0px, 2vw, 28px);
}

.hero-brand {
  display: inline-flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: clamp(30px, 4.5vh, 50px);
}

.hero-logo {
  width: clamp(126px, 11vw, 156px);
  border-radius: 50%;
  clip-path: circle(48.5% at 50% 50%);
  filter: drop-shadow(0 12px 18px rgba(7, 24, 33, .24));
}

.hero-brand-name {
  font-family: "Songti SC", "STSong", "Noto Serif CJK SC", serif;
  font-size: clamp(25px, 2.2vw, 34px);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: .08em;
  white-space: nowrap;
}

.hero h1 {
  max-width: 8em;
  margin: 0;
  font-family: "Songti SC", "STSong", "Noto Serif CJK SC", serif;
  font-size: clamp(44px, 5vw, 76px);
  font-weight: 600;
  line-height: 1.08;
  letter-spacing: .04em;
  text-wrap: balance;
}

.hero-intro {
  max-width: 32em;
  margin: 24px 0 0;
  color: var(--light-muted);
  font-size: clamp(16px, 1.35vw, 19px);
  line-height: 1.8;
  text-wrap: pretty;
}

.download-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  min-width: 178px;
  min-height: 58px;
  margin-top: clamp(28px, 4vh, 44px);
  padding: 14px 24px;
  color: var(--dark-text);
  background: var(--paper-bright);
  border: 0;
  border-radius: 12px;
  box-shadow: 0 18px 40px rgba(7, 9, 15, .24);
  font-weight: 650;
  text-decoration: none;
  transition: transform .35s var(--ease-out), box-shadow .35s var(--ease-out), background-color .35s ease;
}
.download-button:hover {
  background: #fff8ef;
  box-shadow: 0 24px 52px rgba(7, 9, 15, .32);
  transform: translateY(-4px);
}
.download-button:active { transform: translateY(-1px); }

.hero-visual {
  position: relative;
  align-self: end;
  justify-self: end;
  width: min(64vw, 820px);
  margin-right: -3vw;
  will-change: transform;
}
.hero-visual > img {
  position: relative;
  z-index: 2;
  width: 100%;
  filter: drop-shadow(0 40px 42px rgba(5, 8, 16, .25));
  animation: breathe 8s ease-in-out infinite;
}
.hero-block {
  position: absolute;
  z-index: 0;
  top: 19%;
  right: 7%;
  width: 57%;
  height: 56%;
  background: var(--brand-blue);
  clip-path: polygon(14% 0, 100% 0, 100% 84%, 74% 100%, 0 100%, 0 18%);
  opacity: .84;
}
.scroll-cue {
  position: absolute;
  z-index: 3;
  bottom: 28px;
  left: 50%;
  width: 28px;
  height: 50px;
  transform: translateX(-50%);
}
.scroll-cue::before {
  content: "";
  position: absolute;
  top: 0;
  left: 50%;
  width: 1px;
  height: 34px;
  background: rgba(247, 246, 241, .32);
}
.scroll-cue span {
  position: absolute;
  bottom: 3px;
  left: 50%;
  width: 8px;
  height: 8px;
  border-right: 1px solid var(--acorn);
  border-bottom: 1px solid var(--acorn);
  transform: translateX(-50%) rotate(45deg);
  animation: cue 2.4s ease-in-out infinite;
}

.position {
  color: var(--dark-text);
  background: var(--paper);
}
.position-accent {
  position: absolute;
  right: 0;
  bottom: 0;
  width: clamp(170px, 14vw, 230px);
  height: clamp(190px, 18vw, 280px);
  background: var(--brand-blue);
  clip-path: polygon(32% 0, 100% 0, 100% 100%, 0 100%, 0 34%);
}
.position-shell {
  display: grid;
  grid-template-columns: minmax(520px, 1.25fr) minmax(330px, .75fr);
  align-items: center;
  gap: clamp(36px, 7vw, 112px);
  padding: clamp(118px, 14vh, 170px) 0 clamp(72px, 10vh, 120px);
}
.position-visual {
  position: relative;
  margin-left: clamp(-100px, -6vw, -28px);
  will-change: transform;
}
.position-visual::before {
  content: "";
  position: absolute;
  z-index: 0;
  bottom: 4%;
  left: 5%;
  width: 52%;
  height: 42%;
  background: var(--aqua);
  opacity: .62;
}
.position-visual img {
  position: relative;
  z-index: 1;
  width: 100%;
  filter: drop-shadow(0 30px 36px rgba(29, 36, 51, .18));
}
.section-title h2 {
  margin: 0;
  font-family: "Songti SC", "STSong", "Noto Serif CJK SC", serif;
  font-size: clamp(42px, 4.2vw, 66px);
  font-weight: 600;
  line-height: 1.08;
  letter-spacing: .06em;
}
.section-title p {
  margin: 18px 0 0;
  font-size: 13px;
  font-weight: 650;
  line-height: 1;
  letter-spacing: .19em;
  opacity: .72;
}
.position-copy {
  position: relative;
  z-index: 2;
  padding-right: clamp(0px, 2vw, 28px);
}
.position-copy::before {
  content: "";
  position: absolute;
  top: -48px;
  left: 0;
  width: 14px;
  height: 14px;
  background: var(--acorn);
}
.position-text {
  max-width: 430px;
  margin: clamp(48px, 6vh, 72px) 0 0;
  font-size: clamp(18px, 1.55vw, 23px);
  line-height: 1.95;
  letter-spacing: .03em;
}

.features {
  isolation: isolate;
  background: var(--ink-raised);
}
.feature-color-field {
  position: absolute;
  z-index: -1;
  top: 0;
  right: 0;
  width: 37%;
  height: 100%;
  background: var(--brand-blue);
}
.feature-color-field::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 8%;
  width: 52%;
  height: 12px;
  background: var(--acorn);
}
.feature-shell {
  display: grid;
  grid-template-columns: minmax(500px, .95fr) minmax(520px, 1.05fr);
  align-items: center;
  gap: clamp(24px, 4vw, 64px);
  padding: clamp(120px, 15vh, 180px) 0 clamp(82px, 11vh, 128px);
}
.feature-content {
  position: relative;
  z-index: 3;
  display: grid;
  grid-template-columns: minmax(150px, 190px) minmax(300px, 1fr);
  gap: clamp(44px, 5vw, 82px);
}
.feature-heading {
  grid-column: 1 / -1;
  max-width: 12em;
  margin: 0;
  font-family: "Songti SC", "STSong", "Noto Serif CJK SC", serif;
  font-size: clamp(36px, 3.8vw, 56px);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: .04em;
  text-wrap: balance;
}
.tab-list {
  display: flex;
  flex-direction: column;
  align-self: start;
  border-top: 1px solid rgba(247, 246, 241, .18);
}
.tab-button {
  position: relative;
  width: 100%;
  min-height: 64px;
  padding: 18px 0;
  color: rgba(247, 246, 241, .52);
  background: transparent;
  border: 0;
  border-bottom: 1px solid rgba(247, 246, 241, .18);
  text-align: left;
  cursor: pointer;
  transition: color .35s var(--ease-out), padding-left .35s var(--ease-out), font-size .35s var(--ease-out);
}
.tab-button::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: -1px;
  left: 0;
  height: 2px;
  background: var(--acorn);
  transform: scaleX(0);
  transform-origin: right center;
  transition: transform .45s var(--ease-out);
}
.tab-button:hover { color: var(--light-text); }
.tab-button.is-active {
  padding-left: 14px;
  color: var(--acorn);
  font-size: 22px;
  font-weight: 650;
}
.tab-button.is-active::after {
  transform: scaleX(1);
  transform-origin: left center;
}
.tab-panels {
  position: relative;
  min-height: 330px;
  padding-top: 7px;
}
.tab-panel p {
  max-width: 520px;
  margin: 0;
  color: var(--light-text);
  font-size: clamp(18px, 1.45vw, 22px);
  line-height: 1.92;
  letter-spacing: .015em;
}
.tab-panel.is-entering { animation: panel-in .55s var(--ease-out) both; }
.feature-visual {
  position: relative;
  z-index: 2;
  width: min(61vw, 760px);
  margin-right: -9vw;
  will-change: transform;
}
.feature-visual img {
  position: relative;
  z-index: 2;
  width: 100%;
  filter: drop-shadow(0 40px 46px rgba(4, 7, 15, .32));
}
.feature-rule {
  position: absolute;
  z-index: 1;
  top: -7%;
  left: 34%;
  width: 1px;
  height: 118%;
  background: rgba(247, 246, 241, .28);
}
.feature-rule::before,
.feature-rule::after {
  content: "";
  position: absolute;
  left: -5px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
}
.feature-rule::before { top: 0; background: var(--acorn); }
.feature-rule::after { bottom: 0; border: 1px solid var(--light-text); }

.about {
  display: grid;
  grid-template-columns: minmax(0, 44%) minmax(0, 56%);
  color: var(--dark-text);
  background: var(--chestnut);
}
.about-visual {
  position: relative;
  display: flex;
  align-items: center;
  min-height: 100svh;
  padding: clamp(100px, 12vh, 150px) 0 clamp(68px, 9vh, 110px);
  background: var(--ink-raised);
  will-change: transform;
}
.about-visual::before {
  content: "";
  position: absolute;
  top: 18%;
  right: 0;
  width: 32%;
  height: 42%;
  background: var(--brand-blue);
}
.about-visual img {
  position: relative;
  z-index: 2;
  width: min(56vw, 760px);
  max-width: none;
  margin-left: clamp(-70px, -4vw, -24px);
  filter: drop-shadow(0 38px 42px rgba(4, 7, 15, .3));
}
.about-copy {
  display: flex;
  min-height: 100svh;
  align-items: center;
  padding: clamp(110px, 14vh, 170px) clamp(52px, 7vw, 112px) clamp(76px, 10vh, 120px);
}
.about-copy-inner { width: min(100%, 650px); }
.about-copy .section-title p { opacity: .72; }
.about-text {
  margin-top: clamp(44px, 6vh, 72px);
  font-size: clamp(15px, 1.2vw, 18px);
  line-height: 2;
  letter-spacing: .015em;
}
.about-text p { margin: 0; text-indent: 2em; }
.about-text p + p { margin-top: 1.65em; }

.contact {
  display: flex;
  min-height: 100svh;
  flex-direction: column;
  color: var(--dark-text);
  background: var(--paper);
}
.contact-shell {
  display: grid;
  grid-template-columns: minmax(420px, .92fr) minmax(460px, 1.08fr);
  align-items: center;
  gap: clamp(70px, 9vw, 150px);
  flex: 1;
  padding: clamp(116px, 14vh, 166px) 0 clamp(70px, 9vh, 108px);
}
.contact-copy { align-self: center; }
.contact-address { font-style: normal; }
.contact-list {
  margin: clamp(48px, 6vh, 72px) 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid rgba(32, 35, 52, .19);
}
.contact-list li {
  display: grid;
  grid-template-columns: 28px 1fr;
  gap: 18px;
  align-items: center;
  padding: 18px 0;
  border-bottom: 1px solid rgba(32, 35, 52, .19);
  font-size: clamp(14px, 1.1vw, 16px);
  line-height: 1.65;
}
.contact-icon {
  width: 22px;
  height: 22px;
  object-fit: contain;
}
.contact-list a { text-underline-offset: 4px; }
.map-art {
  position: relative;
  justify-self: end;
  width: min(42vw, 560px);
  aspect-ratio: 1.08;
  overflow: hidden;
  background: var(--ink-raised);
  box-shadow: 28px 28px 0 var(--brand-blue);
}
.map-art::before {
  content: "";
  position: absolute;
  right: -1px;
  bottom: -1px;
  width: 28%;
  height: 28%;
  background: var(--acorn);
  clip-path: polygon(100% 0, 100% 100%, 0 100%);
}
.contour {
  position: absolute;
  border: 1px solid rgba(107, 191, 191, .3);
  border-radius: 46% 54% 62% 38% / 42% 45% 55% 58%;
  transform: rotate(-12deg);
}
.contour-one { inset: 7% 11% 13% 8%; }
.contour-two {
  inset: 19% 24% 25% 20%;
  border-color: rgba(107, 191, 191, .4);
  transform: rotate(17deg);
}
.contour-three {
  inset: 32% 36% 35% 33%;
  border-color: rgba(243, 206, 154, .54);
  transform: rotate(-28deg);
}
.map-axis { position: absolute; background: rgba(247, 246, 241, .12); }
.map-axis-x { top: 50%; left: 0; width: 100%; height: 1px; }
.map-axis-y { top: 0; left: 50%; width: 1px; height: 100%; }
.map-pin {
  position: absolute;
  z-index: 3;
  top: 39%;
  left: 57%;
  width: 22px;
  height: 22px;
  border: 6px solid var(--acorn);
  border-radius: 50% 50% 50% 0;
  transform: translate(-50%, -50%) rotate(-45deg);
  box-shadow: 0 0 0 10px rgba(243, 206, 154, .14);
}
.map-pin::after {
  content: "";
  position: absolute;
  inset: -24px;
  border: 1px solid rgba(243, 206, 154, .5);
  border-radius: 50%;
  animation: map-pulse 3.4s ease-out infinite;
}
.footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  width: var(--shell);
  min-height: 76px;
  margin: 0 auto;
  padding: 18px 0;
  color: rgba(32, 35, 52, .68);
  border-top: 1px solid rgba(32, 35, 52, .19);
  font-size: 13px;
  line-height: 1.5;
}
.footer a { text-underline-offset: 4px; }

.reveal { opacity: 1; transform: none; }
.js .reveal {
  opacity: 0;
  transform: translate3d(0, 26px, 0);
  transition: opacity .85s var(--ease-out), transform .85s var(--ease-out);
}
.js .reveal.is-visible { opacity: 1; transform: translate3d(0, 0, 0); }

@keyframes breathe {
  0%, 100% { transform: translate3d(0, 0, 0); }
  50% { transform: translate3d(0, -9px, 0); }
}
@keyframes cue {
  0%, 100% { opacity: .35; transform: translate(-50%, -3px) rotate(45deg); }
  50% { opacity: 1; transform: translate(-50%, 4px) rotate(45deg); }
}
@keyframes panel-in {
  from { opacity: 0; transform: translate3d(16px, 0, 0); }
  to { opacity: 1; transform: translate3d(0, 0, 0); }
}
@keyframes map-pulse {
  0% { opacity: .8; transform: scale(.55); }
  70%, 100% { opacity: 0; transform: scale(1.35); }
}

@media (max-width: 1120px) {
  :root { --shell: min(100% - 64px, 1060px); }
  .site-header { padding: 0 32px; }
  .hero-shell { grid-template-columns: minmax(280px, .72fr) minmax(460px, 1.28fr); }
  .hero-visual { margin-right: -8vw; }
  .position-shell { grid-template-columns: minmax(460px, 1.1fr) minmax(320px, .9fr); gap: 44px; }
  .feature-shell { grid-template-columns: minmax(470px, 1fr) minmax(430px, 1fr); }
  .feature-content { grid-template-columns: 155px 1fr; gap: 38px; }
  .about-copy { padding-right: 56px; padding-left: 56px; }
  .contact-shell { grid-template-columns: minmax(360px, .9fr) minmax(420px, 1.1fr); gap: 64px; }
}

@media (max-width: 880px) {
  :root { --header-height: 70px; --shell: calc(100% - 48px); }
  .site-header { grid-template-columns: 1fr auto; padding: 0 24px; }
  .header-brand img { width: 38px; height: 38px; }
  .header-brand span { font-size: 14px; }
  .menu-toggle { display: block; grid-column: 2; }
  .site-nav {
    position: fixed;
    inset: 0;
    z-index: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--light-text);
    background: var(--ink);
    opacity: 0;
    visibility: hidden;
    transform: translate3d(0, -14px, 0);
    transition: opacity .35s var(--ease-out), visibility .35s, transform .35s var(--ease-out);
  }
  .site-nav.is-open {
    z-index: 1;
    opacity: 1;
    visibility: visible;
    transform: translate3d(0, 0, 0);
  }
  .site-nav ul { flex-direction: column; gap: 18px; }
  .site-nav a {
    padding: 8px 0 12px;
    font-family: "Songti SC", "STSong", "Noto Serif CJK SC", serif;
    font-size: 28px;
    opacity: .58;
  }
  .site-header.is-scrolled[data-theme="light"] .site-nav,
  .site-header[data-theme="light"] .site-nav { color: var(--light-text); }
  .hero::before { width: 48vw; }
  .hero-shell { grid-template-columns: .75fr 1.25fr; gap: 12px; }
  .hero-logo { width: 118px; }
  .hero h1 { font-size: clamp(40px, 6.5vw, 58px); }
  .hero-visual { width: 66vw; margin-right: -12vw; }
  .position-shell { grid-template-columns: 1fr; gap: 24px; padding-top: 116px; }
  .position-visual { width: min(760px, 110%); margin: 0 0 0 -10%; }
  .position-copy { width: min(520px, 100%); margin: 0 0 0 auto; padding: 0 0 80px; }
  .position-copy::before { top: -32px; }
  .feature-color-field { width: 42%; }
  .feature-shell { grid-template-columns: 1fr; gap: 54px; }
  .feature-content { grid-template-columns: 180px 1fr; width: min(680px, 100%); }
  .feature-visual { width: min(820px, 112%); margin: 0 -12% -6% auto; }
  .about { grid-template-columns: 1fr; }
  .about-visual, .about-copy { min-height: auto; }
  .about-visual { min-height: 70svh; padding-top: 100px; }
  .about-visual img { width: min(1000px, 112vw); margin-left: -15vw; }
  .about-copy { padding: 86px 48px 96px; }
  .about-copy-inner { width: min(100%, 720px); margin: 0 auto; }
  .contact-shell { grid-template-columns: 1fr; gap: 72px; }
  .contact-copy { width: min(620px, 100%); }
  .map-art { justify-self: center; width: min(680px, calc(100% - 28px)); margin-right: 28px; }
}

@media (max-width: 620px) {
  :root { --shell: calc(100% - 36px); }
  .site-header { padding: 0 18px; }
  .hero { min-height: 900px; }
  .hero::before { top: auto; bottom: 0; width: 58%; height: 54%; }
  .hero::after { right: 18px; bottom: 42px; width: 136px; height: 7px; }
  .hero-orbit { top: auto; right: -48vw; bottom: -7%; width: 116vw; transform: none; }
  .hero-shell {
    display: flex;
    min-height: 900px;
    flex-direction: column;
    align-items: stretch;
    gap: 26px;
    padding-top: 112px;
  }
  .hero-copy { padding-left: 2px; }
  .hero-brand { gap: 10px; margin-bottom: 26px; }
  .hero-logo { width: 106px; }
  .hero-brand-name { font-size: 24px; }
  .hero h1 { font-size: clamp(42px, 14vw, 58px); }
  .download-button { min-width: 164px; min-height: 54px; margin-top: 30px; }
  .hero-visual { width: 122vw; margin: 6px -33vw 0 auto; }
  .scroll-cue { display: none; }
  .position-accent { width: 140px; height: 150px; }
  .position-shell { gap: 34px; padding: 96px 0 72px; }
  .position-visual { width: 126%; margin-left: -23%; }
  .position-copy { padding-bottom: 168px; }
  .section-title h2 { font-size: clamp(40px, 13vw, 56px); }
  .section-title p { margin-top: 14px; font-size: 11px; }
  .position-text { margin-top: 36px; font-size: 17px; line-height: 1.9; }
  .feature-color-field { top: auto; bottom: 0; width: 48%; height: 46%; }
  .feature-shell { gap: 42px; padding: 96px 0 64px; }
  .feature-content { display: block; width: 100%; }
  .feature-heading { margin-bottom: 34px; font-size: clamp(34px, 10vw, 44px); }
  .tab-list {
    flex-direction: row;
    gap: 22px;
    overflow-x: auto;
    border-top: 0;
    border-bottom: 1px solid rgba(247, 246, 241, .18);
    scrollbar-width: none;
  }
  .tab-list::-webkit-scrollbar { display: none; }
  .tab-button {
    flex: 0 0 auto;
    width: auto;
    min-height: 54px;
    padding: 10px 0 15px;
    border-bottom: 0;
    white-space: nowrap;
  }
  .tab-button.is-active { padding-left: 0; font-size: 19px; }
  .tab-panels { min-height: 300px; padding-top: 34px; }
  .tab-panel p { font-size: 16px; line-height: 1.9; }
  .feature-visual { width: 132%; margin: 0 -30% -3% auto; }
  .feature-rule { left: 43%; }
  .about-visual { min-height: 560px; padding: 94px 0 44px; }
  .about-visual img { width: 142vw; margin-left: -42vw; }
  .about-copy { padding: 72px 18px 82px; }
  .about-text { margin-top: 38px; font-size: 15px; line-height: 1.9; }
  .contact-shell { gap: 58px; padding: 96px 0 80px; }
  .contact-list { margin-top: 40px; }
  .contact-list li { grid-template-columns: 24px 1fr; gap: 14px; padding: 16px 0; font-size: 14px; }
  .contact-icon { width: 20px; height: 20px; }
  .map-art { width: calc(100% - 18px); margin-right: 18px; box-shadow: 18px 18px 0 var(--brand-blue); }
  .footer {
    width: var(--shell);
    min-height: 104px;
    flex-direction: column;
    align-items: flex-start;
    justify-content: center;
    gap: 6px;
    font-size: 12px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: .001ms !important;
  }
  .js .reveal { opacity: 1; transform: none; }
}