:root {
  --sm-ink: #071226;
  --sm-ink-soft: #435068;
  --sm-navy: #020d24;
  --sm-navy-2: #061a3d;
  --sm-blue: #0b63f6;
  --sm-cyan: #28b9ff;
  --sm-coral: #ff4d2f;
  --sm-coral-dark: #e83a20;
  --sm-gold: #f6c858;
  --sm-paper: #ffffff;
  --sm-wash: #f4f7fb;
  --sm-line: #dbe5f2;
  --sm-radius: 12px;
  --sm-shadow: 0 18px 50px rgba(3, 20, 49, 0.14);
  --sm-wrap: 1280px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--sm-ink);
  background: var(--sm-paper);
  font-family: Inter, "Segoe UI", Arial, sans-serif;
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

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

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

button,
input,
textarea,
select {
  font: inherit;
}

.skip-link {
  position: fixed;
  z-index: 200;
  top: 12px;
  left: 12px;
  padding: 10px 14px;
  color: #fff;
  background: var(--sm-navy);
  transform: translateY(-150%);
  transition: transform 160ms ease;
}

.skip-link:focus {
  transform: translateY(0);
}

.wrap {
  width: min(calc(100% - 48px), var(--sm-wrap));
  margin-inline: auto;
}

.site-header {
  position: relative;
  z-index: 50;
  min-height: 82px;
  background: #fff;
  border-bottom: 1px solid #e8eef6;
}

.header-inner {
  min-height: 82px;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 34px;
}

.brand {
  display: inline-flex;
  align-items: baseline;
  font-weight: 950;
  font-style: italic;
  letter-spacing: -3px;
  line-height: 1;
  font-size: 42px;
  color: var(--sm-navy);
}

.brand span {
  color: var(--sm-coral);
}

.main-nav {
  justify-self: center;
  display: flex;
  align-items: center;
  gap: clamp(18px, 2vw, 34px);
  font-size: 15px;
  font-weight: 750;
}

.main-nav a {
  position: relative;
  padding: 27px 0 24px;
  white-space: nowrap;
}

.main-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 18px;
  height: 2px;
  background: var(--sm-coral);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform 160ms ease;
}

.main-nav a:hover::after,
.main-nav a:focus-visible::after,
.main-nav a[aria-current="page"]::after {
  transform: scaleX(1);
}

.header-cta,
.btn {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 22px;
  border: 1px solid transparent;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 850;
  letter-spacing: -0.01em;
  transition: transform 160ms ease, background 160ms ease, border-color 160ms ease;
}

.header-cta,
.btn-primary {
  color: #fff;
  background: var(--sm-coral);
  box-shadow: 0 10px 28px rgba(255, 77, 47, 0.24);
}

.header-cta:hover,
.header-cta:focus-visible,
.btn-primary:hover,
.btn-primary:focus-visible {
  background: var(--sm-coral-dark);
  transform: translateY(-2px);
}

.btn-outline {
  color: #fff;
  border-color: rgba(255, 255, 255, 0.72);
  background: rgba(1, 12, 34, 0.38);
}

.btn-outline:hover,
.btn-outline:focus-visible {
  border-color: var(--sm-cyan);
  background: rgba(11, 99, 246, 0.18);
}

.btn-dark {
  color: #fff;
  background: var(--sm-navy);
}

.btn-dark:hover,
.btn-dark:focus-visible {
  background: var(--sm-blue);
  transform: translateY(-2px);
}

.btn svg {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.mobile-nav {
  display: none;
}

.hero {
  min-height: 650px;
  color: #fff;
  background-color: var(--sm-navy);
  background-image: url("/assets/hero-sm88.webp");
  background-repeat: no-repeat;
  background-size: cover;
  background-position: center;
  overflow: hidden;
}

.hero-inner {
  min-height: 650px;
  display: flex;
  align-items: center;
}

.hero-copy {
  width: min(640px, 50%);
  padding: 70px 0 82px;
}

.hero h1 {
  max-width: 660px;
  margin: 0;
  font-size: clamp(48px, 5.5vw, 76px);
  line-height: 1.02;
  letter-spacing: -0.055em;
  text-wrap: balance;
}

.hero p {
  max-width: 600px;
  margin: 28px 0 0;
  color: #d9e8ff;
  font-size: 19px;
  line-height: 1.68;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}

.hero-note {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 30px;
  color: #a9c1e6;
  font-size: 13px;
  font-weight: 700;
}

.hero-note::before {
  content: "18+";
  display: grid;
  width: 38px;
  height: 38px;
  flex: 0 0 38px;
  place-items: center;
  border: 1px solid #7891b6;
  border-radius: 50%;
  color: #fff;
}

.section {
  padding: 92px 0;
}

.section-heading {
  max-width: 800px;
  margin: 0 auto 46px;
  text-align: center;
}

.section-heading.align-left {
  margin-inline: 0;
  text-align: left;
}

.section-heading h2,
.page-heading h1,
.article-title {
  margin: 0;
  color: var(--sm-ink);
  font-size: clamp(36px, 4.5vw, 56px);
  line-height: 1.08;
  letter-spacing: -0.045em;
  text-wrap: balance;
}

.section-heading p {
  margin: 18px auto 0;
  color: var(--sm-ink-soft);
  font-size: 18px;
}

.section-heading.align-left p {
  margin-left: 0;
}

.experience-rail {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.experience-card {
  min-width: 0;
  overflow: hidden;
  border-radius: var(--sm-radius);
  color: #fff;
  background: var(--sm-navy);
  box-shadow: 0 12px 34px rgba(4, 23, 55, 0.16);
  transition: transform 180ms ease, box-shadow 180ms ease;
}

.experience-card:hover,
.experience-card:focus-within {
  transform: translateY(-6px);
  box-shadow: var(--sm-shadow);
}

.experience-card img {
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.experience-copy {
  min-height: 132px;
  padding: 22px 22px 24px;
  border-top: 2px solid var(--sm-coral);
}

.experience-copy h3 {
  margin: 0;
  font-size: 21px;
  line-height: 1.25;
}

.experience-copy p {
  margin: 9px 0 0;
  color: #b9cae4;
  font-size: 14px;
  line-height: 1.5;
}

.onboarding {
  position: relative;
  color: #fff;
  background: var(--sm-navy);
  overflow: hidden;
}

.onboarding::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(164deg, transparent 0 17%, rgba(11, 99, 246, 0.12) 17.2% 17.5%, transparent 17.8%),
    linear-gradient(12deg, transparent 0 72%, rgba(40, 185, 255, 0.1) 72.2% 72.5%, transparent 72.8%);
  pointer-events: none;
}

.onboarding .section-heading h2,
.onboarding .section-heading p {
  color: #fff;
}

.steps {
  position: relative;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 34px;
  max-width: 1040px;
  margin: 0 auto;
}

.steps::before {
  content: "";
  position: absolute;
  z-index: 0;
  top: 34px;
  left: 16%;
  right: 16%;
  height: 2px;
  background: linear-gradient(90deg, var(--sm-cyan), var(--sm-blue), var(--sm-cyan));
}

.step {
  position: relative;
  z-index: 1;
  text-align: center;
}

.step-number {
  display: grid;
  width: 70px;
  height: 70px;
  margin: 0 auto 22px;
  place-items: center;
  border: 2px solid var(--sm-cyan);
  border-radius: 50%;
  color: #fff;
  background: var(--sm-navy);
  box-shadow: 0 0 0 8px rgba(40, 185, 255, 0.08);
  font-size: 22px;
  font-weight: 900;
}

.step h3 {
  margin: 0;
  font-size: 21px;
}

.step p {
  margin: 9px 0 0;
  color: #aebfd8;
  font-size: 15px;
}

.center-action {
  position: relative;
  z-index: 1;
  margin-top: 42px;
  text-align: center;
}

.promo-band {
  min-height: 520px;
  color: #fff;
  background-color: var(--sm-navy);
  background-image: url("/assets/bonus-sm88.webp");
  background-repeat: no-repeat;
  background-size: cover;
  background-position: center;
}

.promo-inner {
  min-height: 520px;
  display: flex;
  align-items: center;
}

.promo-copy {
  width: min(560px, 49%);
  padding: 70px 0;
}

.promo-copy h2 {
  margin: 0;
  font-size: clamp(42px, 5vw, 66px);
  line-height: 1.06;
  letter-spacing: -0.05em;
}

.promo-copy p {
  margin: 22px 0 30px;
  color: #d6e5fb;
  font-size: 18px;
}

.safety-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.04fr) minmax(0, 1fr);
  align-items: center;
  gap: 70px;
}

.safety-visual {
  overflow: hidden;
  border-radius: var(--sm-radius);
  box-shadow: var(--sm-shadow);
}

.safety-visual img {
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.safety-copy h2 {
  margin: 0 0 28px;
  font-size: clamp(40px, 4.5vw, 58px);
  line-height: 1.06;
  letter-spacing: -0.045em;
}

.check-list {
  margin: 0 0 30px;
  padding: 0;
  list-style: none;
}

.check-list li {
  position: relative;
  padding: 16px 0 16px 44px;
  border-bottom: 1px solid var(--sm-line);
}

.check-list li::before {
  content: "✓";
  position: absolute;
  top: 16px;
  left: 0;
  display: grid;
  width: 27px;
  height: 27px;
  place-items: center;
  border-radius: 50%;
  color: #fff;
  background: var(--sm-blue);
  font-size: 15px;
  font-weight: 900;
}

.knowledge-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr;
  gap: 18px;
}

.knowledge-card {
  display: flex;
  min-width: 0;
  flex-direction: column;
}

.knowledge-card img {
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: var(--sm-radius);
}

.knowledge-card h3 {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
  margin: 18px 8px 0;
  font-size: 21px;
  line-height: 1.35;
  letter-spacing: -0.02em;
}

.knowledge-card h3::after {
  content: "→";
  color: var(--sm-coral);
  font-size: 28px;
  line-height: 1;
}

.knowledge-card:hover h3,
.knowledge-card:focus-visible h3 {
  color: var(--sm-blue);
}

.faq-block {
  padding-top: 0;
}

.faq-list {
  max-width: 1080px;
  margin: 0 auto;
  border-top: 1px solid var(--sm-cyan);
}

.faq-list details {
  border-bottom: 1px solid var(--sm-cyan);
}

.faq-list summary {
  position: relative;
  padding: 22px 50px 22px 0;
  cursor: pointer;
  list-style: none;
  font-weight: 850;
}

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

.faq-list summary::after {
  content: "+";
  position: absolute;
  right: 0;
  color: var(--sm-blue);
  font-size: 30px;
  font-weight: 400;
  line-height: 1;
}

.faq-list details[open] summary::after {
  content: "×";
}

.faq-list details p {
  max-width: 920px;
  margin: -8px 0 24px;
  color: var(--sm-ink-soft);
}

.latest-system {
  padding: 38px 0 0;
}

.latest-system h3 {
  margin: 0 0 18px;
  font-size: 24px;
}

.system-news-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.system-news-card {
  padding: 22px;
  border: 1px solid var(--sm-line);
  border-radius: var(--sm-radius);
  background: #fff;
}

.system-news-card .meta {
  color: var(--sm-blue);
  font-size: 13px;
  font-weight: 800;
}

.system-news-card h4 {
  margin: 8px 0;
  font-size: 19px;
  line-height: 1.35;
}

.system-news-card p {
  margin: 0;
  color: var(--sm-ink-soft);
  font-size: 14px;
}

.pagination {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 22px;
  padding: 0;
  list-style: none;
}

.pagination a,
.pagination span {
  display: inline-grid;
  min-width: 38px;
  min-height: 38px;
  place-items: center;
  padding: 6px 11px;
  border: 1px solid var(--sm-line);
  border-radius: 8px;
  font-size: 14px;
}

.site-footer {
  color: #d8e3f3;
  background: var(--sm-navy);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.25fr repeat(3, 1fr);
  gap: 52px;
  padding: 62px 0 48px;
}

.footer-brand {
  color: #fff;
}

.footer-intro {
  max-width: 320px;
  margin: 20px 0 0;
  color: #9fb1cc;
  font-size: 14px;
}

.footer-column h3 {
  margin: 0 0 16px;
  color: #fff;
  font-size: 15px;
}

.footer-column a {
  display: block;
  width: fit-content;
  margin: 8px 0;
  color: #b5c5dc;
  font-size: 14px;
}

.footer-column a:hover,
.footer-column a:focus-visible {
  color: var(--sm-cyan);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 24px 0 30px;
  border-top: 1px solid rgba(40, 185, 255, 0.34);
  color: #91a4c2;
  font-size: 13px;
}

.age-mark {
  display: inline-grid;
  width: 38px;
  height: 38px;
  flex: 0 0 38px;
  place-items: center;
  margin-right: 10px;
  border: 1px solid #8396b5;
  border-radius: 50%;
  color: #fff;
}

.breadcrumb {
  color: #64738a;
  background: var(--sm-wash);
  border-bottom: 1px solid var(--sm-line);
}

.breadcrumb .wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 14px 0;
  font-size: 13px;
}

.breadcrumb a {
  color: var(--sm-blue);
  font-weight: 750;
}

.page-hero {
  color: #fff;
  background: var(--sm-navy);
}

.page-hero-grid {
  display: grid;
  min-height: 480px;
  grid-template-columns: minmax(0, 1fr) minmax(420px, 0.9fr);
  align-items: center;
  gap: 62px;
  padding: 58px 0;
}

.page-heading h1 {
  color: #fff;
}

.page-heading p {
  max-width: 680px;
  margin: 22px 0 0;
  color: #c2d4ee;
  font-size: 19px;
}

.page-image {
  overflow: hidden;
  border-radius: var(--sm-radius);
  box-shadow: 0 24px 64px rgba(0, 0, 0, 0.32);
}

.page-image img {
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.content-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 72px;
  padding: 76px 0 96px;
}

.prose {
  min-width: 0;
}

.prose > :first-child {
  margin-top: 0;
}

.prose h2 {
  margin: 54px 0 16px;
  font-size: clamp(28px, 3vw, 38px);
  line-height: 1.15;
  letter-spacing: -0.035em;
}

.prose h3 {
  margin: 34px 0 12px;
  font-size: 23px;
  line-height: 1.25;
}

.prose p,
.prose li {
  color: #344258;
}

.prose a {
  color: var(--sm-blue);
  font-weight: 750;
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.prose ul,
.prose ol {
  padding-left: 24px;
}

.prose li + li {
  margin-top: 8px;
}

.prose table {
  width: 100%;
  margin: 26px 0;
  border-collapse: collapse;
  font-size: 15px;
}

.prose th,
.prose td {
  padding: 14px 16px;
  border: 1px solid var(--sm-line);
  text-align: left;
  vertical-align: top;
}

.prose th {
  color: #fff;
  background: var(--sm-navy-2);
}

.prose tr:nth-child(even) td {
  background: var(--sm-wash);
}

.content-note {
  margin: 34px 0;
  padding: 22px 24px;
  border-left: 4px solid var(--sm-coral);
  border-radius: 0 var(--sm-radius) var(--sm-radius) 0;
  background: #fff3ef;
}

.content-note strong {
  display: block;
  margin-bottom: 5px;
  color: var(--sm-coral-dark);
}

.sidebar {
  align-self: start;
  position: sticky;
  top: 24px;
}

.sidebar-block {
  padding: 24px;
  border: 1px solid var(--sm-line);
  border-radius: var(--sm-radius);
  background: var(--sm-wash);
}

.sidebar-block + .sidebar-block {
  margin-top: 18px;
}

.sidebar-block h2 {
  margin: 0 0 15px;
  font-size: 18px;
}

.sidebar-block a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid var(--sm-line);
  color: #344258;
  font-size: 14px;
  font-weight: 700;
}

.sidebar-block a:last-child {
  border-bottom: 0;
}

.sidebar-block a::after {
  content: "→";
  color: var(--sm-coral);
}

.article-header {
  padding: 72px 0 54px;
  background: var(--sm-wash);
}

.article-header .wrap {
  max-width: 980px;
}

.article-kicker {
  margin-bottom: 14px;
  color: var(--sm-blue);
  font-size: 13px;
  font-weight: 850;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.article-meta {
  margin-top: 18px;
  color: #6e7d93;
  font-size: 14px;
}

.article-cover {
  width: min(calc(100% - 48px), 1080px);
  margin: -18px auto 0;
  overflow: hidden;
  border-radius: var(--sm-radius);
  box-shadow: var(--sm-shadow);
}

.article-cover img {
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.article-body {
  width: min(calc(100% - 48px), 900px);
  margin: 0 auto;
  padding: 70px 0 96px;
}

.related-links {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-top: 54px;
}

.related-links a {
  padding: 20px;
  border: 1px solid var(--sm-line);
  border-radius: var(--sm-radius);
  color: var(--sm-ink);
  background: #fff;
  text-decoration: none;
}

.related-links a:hover,
.related-links a:focus-visible {
  border-color: var(--sm-cyan);
  color: var(--sm-blue);
}

:focus-visible {
  outline: 3px solid rgba(40, 185, 255, 0.52);
  outline-offset: 3px;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}

@media (max-width: 1120px) {
  .header-inner {
    gap: 22px;
  }

  .main-nav {
    gap: 16px;
    font-size: 14px;
  }

  .main-nav a:nth-last-child(-n + 2) {
    display: none;
  }

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

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

  .knowledge-card:first-child {
    grid-column: 1 / -1;
  }

  .knowledge-card:first-child img {
    aspect-ratio: 2 / 1;
  }

  .content-layout {
    grid-template-columns: minmax(0, 1fr) 260px;
    gap: 42px;
  }
}

@media (max-width: 860px) {
  .wrap,
  .article-cover,
  .article-body {
    width: min(calc(100% - 32px), var(--sm-wrap));
  }

  .header-inner {
    grid-template-columns: 1fr auto;
    min-height: 72px;
  }

  .site-header {
    min-height: 72px;
  }

  .brand {
    font-size: 36px;
  }

  .main-nav,
  .header-cta {
    display: none;
  }

  .mobile-nav {
    display: block;
    justify-self: end;
  }

  .mobile-nav summary {
    display: grid;
    width: 44px;
    height: 44px;
    cursor: pointer;
    place-items: center;
    border: 1px solid var(--sm-line);
    border-radius: 9px;
    list-style: none;
    font-size: 0;
  }

  .mobile-nav summary::-webkit-details-marker {
    display: none;
  }

  .mobile-nav summary::before {
    content: "";
    width: 20px;
    height: 14px;
    border-top: 2px solid var(--sm-ink);
    border-bottom: 2px solid var(--sm-ink);
    box-shadow: inset 0 5px 0 -3px var(--sm-ink), inset 0 -5px 0 -3px var(--sm-ink);
  }

  .mobile-nav nav {
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    display: grid;
    padding: 12px 16px 18px;
    border-top: 1px solid var(--sm-line);
    background: #fff;
    box-shadow: 0 18px 35px rgba(3, 20, 49, 0.16);
  }

  .mobile-nav nav a {
    padding: 11px 10px;
    border-bottom: 1px solid var(--sm-line);
    font-size: 14px;
    font-weight: 750;
  }

  .hero,
  .hero-inner {
    min-height: 760px;
  }

  .hero {
    background-position: 68% center;
  }

  .hero-copy {
    width: 68%;
  }

  .hero h1 {
    font-size: clamp(46px, 8vw, 64px);
  }

  .safety-grid,
  .page-hero-grid {
    grid-template-columns: 1fr;
  }

  .page-hero-grid {
    gap: 34px;
  }

  .page-image {
    max-width: 680px;
  }

  .content-layout {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
  }

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

@media (max-width: 640px) {
  body {
    font-size: 16px;
  }

  .section {
    padding: 68px 0;
  }

  .hero,
  .hero-inner {
    min-height: 720px;
  }

  .hero {
    background-size: auto 100%;
    background-position: 34% center;
  }

  .hero-inner {
    align-items: flex-end;
  }

  .hero-copy {
    width: 100%;
    padding: 72px 0 58px;
  }

  .hero h1 {
    max-width: 500px;
    font-size: clamp(42px, 12vw, 58px);
  }

  .hero p {
    max-width: 440px;
    font-size: 17px;
  }

  .hero-actions {
    display: grid;
    grid-template-columns: 1fr;
  }

  .btn {
    width: 100%;
  }

  .experience-rail,
  .knowledge-grid,
  .system-news-grid,
  .related-links {
    grid-template-columns: 1fr;
  }

  .knowledge-card:first-child {
    grid-column: auto;
  }

  .knowledge-card:first-child img {
    aspect-ratio: 3 / 2;
  }

  .steps {
    grid-template-columns: 1fr;
  }

  .steps::before {
    top: 32px;
    bottom: 32px;
    left: 34px;
    right: auto;
    width: 2px;
    height: auto;
  }

  .step {
    display: grid;
    grid-template-columns: 70px 1fr;
    gap: 20px;
    text-align: left;
  }

  .step-number {
    grid-row: 1 / span 2;
    margin: 0;
  }

  .step h3 {
    align-self: end;
  }

  .promo-band,
  .promo-inner {
    min-height: 620px;
  }

  .promo-band {
    background-size: auto 100%;
    background-position: 34% center;
  }

  .promo-inner {
    align-items: flex-end;
  }

  .promo-copy {
    width: 100%;
    padding: 58px 0;
  }

  .promo-copy h2 {
    max-width: 470px;
    font-size: 44px;
  }

  .safety-grid {
    gap: 36px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer-bottom {
    align-items: flex-start;
    flex-direction: column;
  }

  .page-hero-grid {
    min-height: auto;
    grid-template-columns: minmax(0, 1fr);
    padding: 46px 0 58px;
  }

  .content-layout {
    padding: 58px 0 72px;
  }

  .prose table {
    display: block;
    overflow-x: auto;
    white-space: nowrap;
  }
}

/* Mobile content-first layout, approved 2026-07-13. */
@media (max-width: 860px) {
  html {
    scroll-padding-top: 64px;
  }

  .site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    min-height: 64px;
    background: rgba(255, 255, 255, 0.96);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
  }

  .header-inner {
    min-height: 64px;
  }

  .mobile-nav nav {
    top: 64px;
    max-height: calc(100vh - 64px);
    overflow-y: auto;
  }

  .experience-card img,
  .knowledge-card img,
  .safety-visual img,
  .page-image img,
  .article-cover img {
    height: auto;
  }
}

@media (max-width: 640px) {
  .wrap,
  .article-cover,
  .article-body {
    width: min(calc(100% - 28px), var(--sm-wrap));
  }

  .section {
    padding: 48px 0;
  }

  .section-heading {
    margin-bottom: 26px;
  }

  .section-heading h2,
  .page-heading h1,
  .article-title {
    font-size: clamp(30px, 9vw, 36px);
  }

  .section-heading p {
    margin-top: 12px;
    font-size: 15.5px;
  }

  .hero,
  .hero-inner {
    min-height: 430px;
  }

  .hero {
    background-size: cover;
    background-position: 44% center;
  }

  .hero-inner {
    align-items: center;
  }

  .hero-copy {
    width: 100%;
    padding: 34px 0 30px;
  }

  .hero h1 {
    max-width: 340px;
    font-size: clamp(34px, 10.5vw, 40px);
  }

  .hero p {
    max-width: 340px;
    margin-top: 16px;
    font-size: 15.5px;
    line-height: 1.55;
  }

  .hero-actions {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px;
    margin-top: 20px;
  }

  .btn {
    min-height: 44px;
    padding: 10px 12px;
    font-size: 13px;
  }

  .hero-note {
    gap: 9px;
    margin-top: 18px;
    font-size: 11px;
    line-height: 1.4;
  }

  .hero-note::before {
    width: 32px;
    height: 32px;
    flex-basis: 32px;
  }

  .experience-rail {
    display: flex;
    gap: 12px;
    overflow-x: auto;
    padding-bottom: 4px;
    scroll-snap-type: x mandatory;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
  }

  .experience-rail::-webkit-scrollbar {
    display: none;
  }

  .experience-card {
    flex: 0 0 min(78%, 280px);
    scroll-snap-align: start;
  }

  .experience-card img {
    height: auto;
    aspect-ratio: 3 / 2;
  }

  .experience-copy {
    min-height: 0;
    padding: 16px 16px 18px;
  }

  .experience-copy h3 {
    font-size: 18px;
  }

  .experience-copy p {
    font-size: 13px;
  }

  .steps {
    gap: 18px;
  }

  .steps::before {
    top: 28px;
    bottom: 28px;
    left: 28px;
  }

  .step {
    grid-template-columns: 58px 1fr;
    gap: 14px;
  }

  .step-number {
    width: 58px;
    height: 58px;
    font-size: 18px;
  }

  .step h3 {
    font-size: 18px;
  }

  .step p {
    font-size: 14px;
  }

  .center-action {
    margin-top: 28px;
  }

  .promo-band,
  .promo-inner {
    min-height: 430px;
  }

  .promo-band {
    background-size: cover;
    background-position: 40% center;
  }

  .promo-copy {
    padding: 40px 0;
  }

  .promo-copy h2 {
    font-size: clamp(32px, 9.5vw, 40px);
  }

  .promo-copy p {
    margin: 16px 0 22px;
    font-size: 15.5px;
  }

  .safety-grid {
    gap: 24px;
  }

  .safety-copy h2 {
    margin-bottom: 18px;
    font-size: clamp(30px, 9vw, 38px);
  }

  .check-list {
    margin-bottom: 22px;
  }

  .check-list li {
    padding: 12px 0 12px 38px;
  }

  .check-list li::before {
    top: 12px;
  }

  .knowledge-grid {
    gap: 24px;
  }

  .knowledge-card img {
    height: auto;
  }

  .knowledge-card h3 {
    margin-top: 12px;
    font-size: 18px;
  }

  .footer-grid {
    padding: 44px 0 36px;
  }

  .page-hero-grid {
    gap: 20px;
    padding: 30px 0 34px;
  }

  .page-heading p {
    margin-top: 14px;
    font-size: 15.5px;
    line-height: 1.6;
  }

  .page-image img {
    height: auto;
    aspect-ratio: 3 / 2;
  }

  .content-layout {
    padding: 42px 0 56px;
  }

  .prose h2 {
    margin-top: 34px;
    font-size: 28px;
  }

  .prose h3 {
    margin-top: 26px;
    font-size: 21px;
  }

  .article-header {
    padding: 44px 0 34px;
  }

  .article-cover img {
    height: auto;
    aspect-ratio: 3 / 2;
  }

  .article-body {
    padding: 44px 0 58px;
  }

  .related-links {
    grid-template-columns: 1fr;
    margin-top: 36px;
  }
}

@media (max-width: 360px) {
  .hero-actions {
    grid-template-columns: 1fr;
  }
}