:root {
  color: #101b35;
  background: #ffffff;
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans CJK SC", Arial, sans-serif;
  font-synthesis: none;
  text-rendering: optimizeLegibility;
  --blue: #1f6eff;
  --blue-deep: #2558f5;
  --ink: #101b35;
  --muted: #5f6c85;
  --line: #dfe8f5;
  --soft: #f8fbff;
  --shadow: 0 12px 34px rgba(31, 77, 142, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  min-width: 320px;
  scroll-behavior: smooth;
  scroll-padding-top: 92px;
}

body {
  margin: 0;
  min-width: 320px;
  min-height: 100vh;
  color: var(--ink);
  background: #fff;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

button,
a {
  -webkit-tap-highlight-color: transparent;
}

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

svg { width: 1em; height: 1em; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.menu-button .close-icon { display: none; }
.menu-button.is-open .menu-icon { display: none; }
.menu-button.is-open .close-icon { display: block; }

.wide-shell {
  width: min(1450px, calc(100% - 120px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  z-index: 100;
  top: 0;
  height: 94px;
  border-bottom: 1px solid rgba(221, 231, 244, 0.8);
  background: #ffffff;
}

.nav-shell {
  width: min(1505px, calc(100% - 64px));
  height: 100%;
  margin: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  flex: 0 0 auto;
  gap: 13px;
  color: #0c172e;
  font-size: 25px;
  font-weight: 800;
  letter-spacing: -0.5px;
}

.brand img {
  width: 39px;
  height: 39px;
  object-fit: contain;
}

.main-nav {
  align-self: stretch;
  display: flex;
  align-items: center;
  gap: clamp(30px, 3.35vw, 58px);
  margin-left: auto;
}

.main-nav a {
  position: relative;
  display: grid;
  height: 100%;
  place-items: center;
  color: #10172a;
  font-size: 17px;
  font-weight: 650;
  transition: color 0.2s ease;
}

.main-nav a::after {
  position: absolute;
  right: 0;
  bottom: 28px;
  left: 0;
  height: 2px;
  border-radius: 999px;
  background: var(--blue-deep);
  content: "";
  opacity: 0;
  transform: scaleX(0.35);
  transition: 0.2s ease;
}

.main-nav a:hover,
.main-nav a.active {
  color: var(--blue-deep);
}

.main-nav a:hover::after,
.main-nav a.active::after {
  opacity: 1;
  transform: scaleX(1);
}

.nav-actions {
  display: flex;
  flex: 0 0 auto;
  gap: 16px;
  margin-left: clamp(12px, 3vw, 56px);
}

.menu-button {
  display: none;
  padding: 8px;
  border: 0;
  background: transparent;
  color: var(--ink);
  font-size: 26px;
}

.button {
  min-width: 200px;
  height: 58px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 11px;
  border: 1px solid var(--blue);
  border-radius: 999px;
  font-size: 17px;
  font-weight: 700;
  transition: transform 0.2s ease, box-shadow 0.2s ease, filter 0.2s ease;
}

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

.button:focus-visible,
.main-nav a:focus-visible,
.platform-card:focus-visible,
.floating-tools a:focus-visible,
summary:focus-visible {
  outline: 3px solid rgba(31, 110, 255, 0.25);
  outline-offset: 3px;
}

.button.small {
  min-width: 112px;
  height: 44px;
  padding: 0 25px;
  font-size: 16px;
}

.button-primary {
  border-color: transparent;
  color: #fff;
  background: linear-gradient(104deg, #2459f6 0%, #2b91f0 100%);
  box-shadow: 0 12px 28px rgba(37, 91, 246, 0.22);
}

.button-primary:hover {
  box-shadow: 0 16px 34px rgba(37, 91, 246, 0.3);
  filter: saturate(1.05);
}

.button-outline {
  color: #172038;
  background: rgba(255, 255, 255, 0.75);
}

.nav-actions .button-outline {
  color: var(--blue-deep);
}

.hero-section {
  position: relative;
  min-height: 784px;
  overflow: hidden;
  background: #fff;
}

.hero-glow {
  position: absolute;
  z-index: 0;
  border-radius: 50%;
  filter: blur(4px);
  pointer-events: none;
}

.hero-glow-a {
  top: 180px;
  right: -180px;
  width: 680px;
  height: 680px;
  background: radial-gradient(circle, rgba(105, 199, 255, 0.2), rgba(255, 255, 255, 0) 68%);
}

.hero-glow-b {
  bottom: -280px;
  left: 22%;
  width: 720px;
  height: 520px;
  background: radial-gradient(circle, rgba(87, 128, 255, 0.14), rgba(255, 255, 255, 0) 70%);
}

.hero-grid {
  position: relative;
  z-index: 1;
  min-height: 784px;
  padding: 48px 0 76px;
  display: grid;
  grid-template-columns: 42% 58%;
  align-items: center;
}

.hero-copy {
  padding: 28px 0 0 4px;
}

.eyebrow {
  margin: 0 0 22px;
  color: var(--blue);
  font-size: 21px;
  font-weight: 650;
  letter-spacing: 0.5px;
}

.hero-copy h1 {
  margin: 0;
  color: #0d1832;
  font-size: clamp(43px, 4.15vw, 63px);
  line-height: 1.16;
  letter-spacing: -2px;
  white-space: normal;
}

.hero-subtitle {
  margin: 27px 0 22px;
  color: #536078;
  font-size: 22px;
  letter-spacing: 1px;
}

.hero-description {
  max-width: 580px;
  margin: 0 0 34px;
  color: #5f6c85;
  font-size: 18px;
  line-height: 1.85;
}

.hero-actions {
  display: flex;
  gap: 20px;
}

.hero-visual {
  min-width: 0;
  display: flex;
  justify-content: flex-end;
  align-items: center;
  overflow: hidden;
}

.hero-visual img {
  width: min(100%, 800px);
  object-fit: contain;
  filter: drop-shadow(0 26px 32px rgba(45, 85, 150, 0.13));
  transform: translateZ(0);
}

.platform-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 28px;
}

.platform-grid.compact {
  margin-top: 40px;
  gap: 14px;
}

.platform-card {
  position: relative;
  min-height: 164px;
  padding: 26px 24px;
  border: 1px solid var(--line);
  border-radius: 15px;
  background: rgba(255, 255, 255, 0.92);
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  color: inherit;
  font-family: inherit;
  text-align: center;
  cursor: pointer;
  transition: transform 0.24s ease, box-shadow 0.24s ease, border-color 0.24s ease;
}

.platform-card:hover {
  border-color: #a9c8ff;
  box-shadow: 0 18px 36px rgba(31, 77, 142, 0.13);
  transform: translateY(-4px);
}

.platform-card img {
  width: 66px;
  height: 66px;
  object-fit: contain;
}

.platform-card strong,
.platform-card span {
  display: block;
}

.platform-card strong {
  margin-bottom: 8px;
  font-size: 21px;
}

.platform-card span {
  color: var(--blue);
  font-size: 15px;
  font-weight: 650;
}

.platform-arrow {
  position: absolute;
  right: 18px;
  bottom: 18px;
  color: #95a4bb;
}

.platform-grid.compact .platform-card {
  min-height: 96px;
  padding: 18px;
  gap: 10px;
  box-shadow: 0 10px 24px rgba(31, 77, 142, 0.06);
}

.hero-copy .platform-grid.compact .platform-card {
  min-height: 132px;
}

.platform-grid.compact .platform-card img {
  width: 52px;
  height: 52px;
}

.platform-grid.compact .platform-card strong {
  margin: 0;
  font-size: 16px;
}

.section {
  padding: 90px 0;
}

.section-soft {
  background: linear-gradient(180deg, #fbfdff 0%, #f7faff 100%);
}

#features.section {
  padding-top: 8px;
  padding-bottom: 20px;
}

#download.section {
  padding-top: 40px;
}

#download .section-number,
#download .section-title,
#download .section-intro {
  text-align: center;
}

#download .section-intro {
  margin-right: auto;
  margin-left: auto;
}

#guide.section {
  padding-top: 40px;
  padding-bottom: 40px;
}

#guide .section-title,
#guide .section-intro,
#faq .section-title,
#faq .section-intro {
  text-align: center;
}

#guide .section-intro,
#faq .section-intro {
  margin-right: auto;
  margin-left: auto;
}

.section-number {
  display: block;
  margin-bottom: 14px;
  color: #d9e5ff;
  font-size: 46px;
  font-weight: 800;
  letter-spacing: 3px;
}

.section-title,
.feature-copy h2 {
  margin: 0 0 18px;
  color: #101b35;
  font-size: clamp(38px, 3.2vw, 51px);
  line-height: 1.25;
  letter-spacing: -1px;
}

.section-title.left,
.section-intro.left {
  text-align: left;
}

.section-intro,
.feature-copy > p {
  max-width: 720px;
  margin: 0 0 38px;
  color: var(--muted);
  font-size: 18px;
  line-height: 1.8;
}

.feature-panel {
  min-height: 445px;
  padding: 56px;
  border: 1px solid #dce8f7;
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.72);
  box-shadow: 0 16px 42px rgba(38, 83, 144, 0.05);
  display: grid;
  grid-template-columns: 52% 48%;
  align-items: center;
  overflow: hidden;
}

.feature-copy > p {
  max-width: 610px;
}

.feature-points {
  display: flex;
  flex-wrap: wrap;
  gap: 32px;
}

.feature-points span {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-size: 17px;
  font-weight: 700;
}

.feature-points svg {
  width: 48px;
  height: 48px;
  padding: 12px;
  border-radius: 50%;
  color: var(--blue);
  background: #edf4ff;
}

.feature-art {
  width: 100%;
  height: 340px;
  object-fit: contain;
  transform: translateZ(0);
}

.mac-note {
  margin: 24px 0 0;
  color: #77839a;
  text-align: center;
}

.mac-note a {
  color: var(--blue);
  font-weight: 700;
}

.nodes-section {
  position: relative;
  padding-top: 40px;
  padding-bottom: 50px;
  background: #fff;
}

.nodes-grid {
  display: grid;
  grid-template-columns: 44% 56%;
  align-items: center;
  gap: 30px;
}

.region-grid {
  max-width: 580px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.region-card {
  min-height: 78px;
  padding: 14px 18px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  box-shadow: var(--shadow);
  display: flex;
  align-items: center;
  gap: 13px;
}

.region-card img,
.country-code {
  width: 42px;
  height: 42px;
  flex: 0 0 42px;
  object-fit: contain;
}

.country-code {
  border: 1px solid #dbe6f7;
  border-radius: 7px;
  color: var(--blue-deep);
  background: #f4f8ff;
  display: grid;
  place-items: center;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.5px;
}

.region-card strong {
  font-size: 17px;
}

.world-map {
  width: 100%;
  height: 440px;
  object-fit: contain;
  mix-blend-mode: multiply;
  transform: translateZ(0);
}

.scene-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 24px;
}

.scene-card {
  min-height: 165px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #fff;
  box-shadow: var(--shadow);
  display: flex;
  align-items: center;
  gap: 16px;
}

.scene-card img {
  width: 120px;
  height: 112px;
  flex: 0 0 120px;
  object-fit: contain;
  transform: translateZ(0);
}

.scene-card h3 {
  margin: 0 0 8px;
  font-size: 20px;
}

.scene-card p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.65;
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 96px;
}

.step-card {
  position: relative;
  min-height: 138px;
  padding: 32px 28px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #fff;
  box-shadow: var(--shadow);
  display: flex;
  align-items: center;
  gap: 22px;
}

.step-card:not(:last-child)::after {
  position: absolute;
  top: 50%;
  left: 100%;
  width: 96px;
  height: 1px;
  background: var(--blue);
  content: "";
}

.step-card > span {
  width: 54px;
  height: 54px;
  flex: 0 0 54px;
  border-radius: 50%;
  color: #fff;
  background: linear-gradient(145deg, #327bf8, #2259f2);
  box-shadow: 0 8px 20px rgba(31, 110, 255, 0.2);
  display: grid;
  place-items: center;
  font-size: 28px;
  font-weight: 800;
}

.step-card h3 {
  margin: 0 0 8px;
  font-size: 22px;
}

.step-card p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.6;
}

.faq-section {
  border-top: 1px solid #e7eef8;
  padding-top: 55px;
  background: #fbfdff;
}

.faq-list {
  display: grid;
  gap: 7px;
}

.faq-list details {
  border: 1px solid var(--line);
  border-radius: 9px;
  background: #fff;
  box-shadow: 0 4px 14px rgba(31, 77, 142, 0.04);
  overflow: hidden;
}

.faq-list summary {
  min-height: 58px;
  padding: 0 20px;
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  font-size: 17px;
  font-weight: 700;
}

.faq-list summary::-webkit-details-marker {
  display: none;
}

.faq-list summary svg {
  color: #6e7f99;
  transition: transform 0.2s ease;
}

.faq-list details[open] summary svg {
  transform: rotate(180deg);
}

.faq-list details p {
  margin: 0;
  padding: 0 20px 20px;
  color: var(--muted);
  line-height: 1.75;
}

.cta-section {
  padding-top: 40px;
  padding-bottom: 40px;
  text-align: center;
}

.cta-section h2 {
  margin: 0 0 18px;
  font-size: clamp(38px, 3.2vw, 51px);
  letter-spacing: -1px;
}

.cta-section > .wide-shell > p {
  margin: 0;
  color: var(--muted);
  font-size: 18px;
  line-height: 1.8;
}

.hero-actions.centered {
  justify-content: center;
  margin-top: 38px;
}

.cta-section .platform-grid.compact {
  width: min(1000px, 100%);
  margin: 46px auto 0;
}

.support-panel {
  margin-top: 56px;
  padding: 34px 28px 26px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: #fff;
  box-shadow: var(--shadow);
  text-align: left;
}

.support-panel h3 {
  margin: 0 0 20px;
  font-size: 24px;
}

.support-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 22px;
}

.support-grid a {
  min-height: 86px;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: 13px;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 14px;
  transition: 0.2s ease;
}

.support-grid a:hover {
  border-color: #a9c8ff;
  transform: translateY(-2px);
}

.support-grid a > svg:first-child {
  color: var(--blue);
  font-size: 31px;
}

.support-grid a > svg:last-child {
  color: #94a2b7;
}

.support-grid strong,
.support-grid small {
  display: block;
}

.support-grid strong {
  margin-bottom: 5px;
  font-size: 17px;
}

.support-grid small {
  color: var(--muted);
  font-size: 13px;
}

.site-footer {
  padding: 54px 0 20px;
  border-top: 1px solid #e8eef7;
  background: #fff;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr repeat(3, 0.7fr);
  gap: 50px;
}

.footer-grid > div {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 10px;
}

.footer-grid > div:first-child {
  gap: 16px;
}

.footer-grid p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.footer-grid h4 {
  margin: 0 0 3px;
  font-size: 16px;
}

.footer-grid > div:not(:first-child) a {
  color: var(--muted);
  font-size: 14px;
}

.copyright {
  margin: 34px 0 0;
  color: #8996aa;
  text-align: center;
  font-size: 14px;
}

.floating-tools {
  position: fixed;
  z-index: 90;
  top: 51%;
  right: 12px;
  width: 64px;
  border: 1px solid #e5edf8;
  border-radius: 34px;
  background: rgba(255, 255, 255, 0.96);
  box-shadow: 0 12px 32px rgba(30, 70, 130, 0.1);
  overflow: hidden;
  transform: translateY(-50%);
}

.floating-tools a {
  min-height: 78px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 7px;
  font-size: 13px;
  font-weight: 700;
}

.floating-tools a + a {
  border-top: 1px solid #e7eef7;
}

.floating-tools svg {
  font-size: 25px;
}

body.ios-guide-open {
  overflow: hidden;
}

.ios-guide-overlay[hidden] {
  display: none;
}

.ios-guide-overlay {
  position: fixed;
  inset: 0;
  z-index: 9999;
  padding: 20px;
  background: rgba(3, 10, 25, 0.86);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: grid;
  place-items: center;
}

.ios-guide-modal {
  position: relative;
  width: min(468px, calc(100vw - 40px));
  max-height: calc(100vh - 40px);
  overflow: auto;
  padding: 22px 22px 34px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 18px;
  color: #e8edf6;
  background: #121d33;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.5);
  font-size: 16px;
}

.ios-guide-close {
  position: absolute;
  top: 13px;
  right: 16px;
  width: 34px;
  height: 34px;
  padding: 0;
  border: 0;
  outline: 0;
  color: #7f8ba2;
  background: transparent;
  font: 400 25px/1 Arial, sans-serif;
  cursor: pointer;
}

.ios-guide-close:hover {
  color: #fff;
}

.ios-guide-eyebrow {
  margin: 2px 30px 14px;
  color: #8995aa;
  text-align: center;
  font-size: 12px;
  letter-spacing: 1.3px;
}

.ios-guide-tabs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.ios-guide-tab {
  position: relative;
  min-height: 128px;
  padding: 16px 12px 14px;
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 14px;
  color: #e8edf6;
  background: #0b1424;
  font-family: inherit;
  cursor: pointer;
}

.ios-guide-tab[aria-selected="true"] {
  border-color: #6d5efc;
  background: rgba(109, 94, 252, 0.08);
  box-shadow: 0 8px 22px rgba(109, 94, 252, 0.15);
}

.ios-guide-tab[data-mode="webapp"][aria-selected="true"] {
  border-color: #f0b53f;
  background: rgba(240, 181, 63, 0.08);
  box-shadow: 0 8px 22px rgba(240, 181, 63, 0.12);
}

.ios-guide-check {
  position: absolute;
  top: 9px;
  right: 10px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  color: #fff;
  background: #6d5efc;
  display: none;
  text-align: center;
  font-size: 12px;
  font-weight: 800;
  line-height: 18px;
}

.ios-guide-tab[data-mode="webapp"] .ios-guide-check {
  color: #192236;
  background: #eead34;
}

.ios-guide-tab[aria-selected="true"] .ios-guide-check {
  display: block;
}

.ios-guide-tab img {
  width: 48px;
  height: 48px;
  margin: 0 auto 9px;
  border-radius: 11px;
  object-fit: cover;
}

.ios-guide-tab-name {
  display: block;
  font-size: 15px;
  font-weight: 700;
}

.ios-guide-tag {
  display: inline-block;
  margin-top: 7px;
  padding: 2px 8px;
  border-radius: 999px;
  color: #806fff;
  background: rgba(109, 94, 252, 0.12);
  font-size: 12px;
  font-weight: 800;
}

.ios-guide-tab[data-mode="webapp"] .ios-guide-tag {
  color: #efb540;
  background: rgba(240, 181, 63, 0.1);
}

.ios-guide-panel {
  padding-top: 26px;
  text-align: center;
}

.ios-guide-panel[hidden] {
  display: none;
}

.ios-guide-panel-icon {
  width: 58px;
  height: 58px;
  margin: 0 auto 15px;
  border-radius: 14px;
  object-fit: cover;
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.22);
}

.ios-guide-panel h3 {
  margin: 0 0 8px;
  color: #fff;
  font-size: 21px;
  line-height: 1.35;
}

.ios-guide-sub {
  max-width: 360px;
  margin: 0 auto 18px;
  color: #9ba6ba;
  font-size: 14px;
  line-height: 1.65;
}

.ios-guide-warning {
  margin: 0 0 18px;
  padding: 12px 14px;
  border: 1px solid rgba(240, 181, 63, 0.2);
  border-radius: 11px;
  color: #f1bd58;
  background: rgba(240, 181, 63, 0.08);
  display: flex;
  align-items: flex-start;
  gap: 10px;
  text-align: left;
  font-size: 13px;
  line-height: 1.55;
}

.ios-guide-warning strong {
  color: #ffd987;
}

.ios-guide-benefits {
  width: max-content;
  max-width: 100%;
  margin: 0 auto 18px;
  padding: 0;
  list-style: none;
  color: #d7deeb;
  display: grid;
  gap: 9px;
  text-align: left;
  font-size: 14px;
}

.ios-guide-benefits li {
  display: flex;
  align-items: center;
  gap: 9px;
}

.ios-guide-benefits i {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  color: #efb540;
  background: rgba(240, 181, 63, 0.12);
  display: inline-grid;
  place-items: center;
  font-style: normal;
  font-size: 12px;
}

.ios-guide-action {
  width: 100%;
  min-height: 47px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 10px;
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
}

.ios-guide-action.is-primary {
  border: 0;
  background: #6d5efc;
}

.ios-guide-action:hover {
  filter: brightness(1.08);
}

.ios-guide-hint {
  margin: 12px 0 0;
  color: #7f8aa0;
  font-size: 12px;
}

@media (max-width: 1280px) {
  .wide-shell {
    width: min(1180px, calc(100% - 48px));
  }

  .main-nav {
    gap: 26px;
  }

  .nav-actions {
    margin-left: 10px;
  }

  .hero-grid {
    grid-template-columns: 45% 55%;
  }

  .hero-copy h1 {
    font-size: 44px;
  }

  .scene-card {
    padding: 20px 15px;
    gap: 10px;
  }

  .scene-card img {
    width: 96px;
    flex-basis: 96px;
  }
}

@media (max-width: 1020px) {
  .site-header {
    height: 78px;
  }

  .nav-shell {
    width: calc(100% - 36px);
  }

  .menu-button {
    display: grid;
    place-items: center;
    order: 3;
  }

  .main-nav {
    position: absolute;
    top: 78px;
    right: 18px;
    left: 18px;
    height: auto;
    padding: 16px;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: #fff;
    box-shadow: var(--shadow);
    display: none;
    grid-template-columns: repeat(2, 1fr);
    gap: 4px;
  }

  .main-nav.is-open {
    display: grid;
  }

  .main-nav a {
    height: 46px;
    border-radius: 9px;
  }

  .main-nav a::after {
    display: none;
  }

  .main-nav a:hover,
  .main-nav a.active {
    background: #f1f6ff;
  }

  .nav-actions {
    margin-left: auto;
  }

  .nav-actions .button-outline {
    display: none;
  }

  .hero-grid {
    min-height: auto;
    padding: 70px 0;
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .hero-copy {
    text-align: center;
  }

  .hero-description {
    margin-right: auto;
    margin-left: auto;
  }

  .hero-actions {
    justify-content: center;
  }

  .hero-visual {
    justify-content: center;
  }

  .hero-visual img {
    width: min(800px, 100%);
  }

  .platform-grid,
  .scene-grid,
  .support-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .feature-panel,
  .nodes-grid {
    grid-template-columns: 1fr;
  }

  .feature-art {
    order: -1;
  }

  .nodes-copy {
    order: 2;
  }

  .world-map {
    height: 420px;
  }

  .steps-grid {
    gap: 24px;
  }

  .step-card:not(:last-child)::after {
    display: none;
  }

  .footer-grid {
    grid-template-columns: 1.5fr repeat(3, 1fr);
    gap: 30px;
  }
}

@media (max-width: 680px) {
  .wide-shell {
    width: calc(100% - 32px);
  }

  .brand {
    gap: 9px;
    font-size: 19px;
  }

  .brand img {
    width: 33px;
    height: 33px;
  }

  .nav-actions .button.small {
    min-width: 104px;
    height: 40px;
    padding: 0 16px;
    font-size: 14px;
  }

  .hero-grid {
    padding: 52px 0 66px;
  }

  .eyebrow {
    font-size: 17px;
  }

  .hero-copy h1 {
    font-size: 34px;
    white-space: normal;
  }

  .hero-subtitle {
    font-size: 18px;
  }

  .hero-description {
    font-size: 16px;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .button {
    width: 100%;
  }

  .platform-grid,
  .platform-grid.compact,
  .scene-grid,
  .steps-grid,
  .support-grid {
    grid-template-columns: 1fr;
  }

  .hero-copy .platform-grid.compact {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .platform-grid.compact .platform-card {
    min-height: 92px;
  }

  .platform-card {
    min-height: 126px;
  }

  .section {
    padding: 66px 0;
  }

  .section-title,
  .feature-copy h2,
  .cta-section h2 {
    font-size: 34px;
  }

  .feature-panel {
    padding: 30px 22px;
  }

  .feature-art {
    height: 240px;
  }

  .feature-points {
    display: grid;
    gap: 14px;
  }

  .region-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .world-map {
    height: 300px;
  }

  .scene-card img {
    width: 112px;
    flex-basis: 112px;
  }

  .cta-section .platform-grid.compact {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .support-panel {
    padding: 26px 18px;
  }

  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-grid > div:first-child {
    grid-column: 1 / -1;
  }

  .floating-tools {
    display: none;
  }
}

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

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}