:root {
  --bg: #ffffff;
  --bg-soft: #f5fbfc;
  --bg-blue: #eaf8fb;
  --ink: #10232a;
  --ink-2: #2f4852;
  --muted: #60747c;
  --line: #dbe9ec;
  --teal: #057c89;
  --teal-dark: #075965;
  --sky: #bfeef4;
  --coral: #e96352;
  --coral-dark: #c94738;
  --shadow: 0 18px 60px rgba(16, 35, 42, 0.1);
  --radius: 8px;
  --radius-lg: 18px;
  --max: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.55;
}

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

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

p {
  margin: 0;
}

main {
  overflow: hidden;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  width: min(100% - 32px, var(--max));
  margin: 0 auto;
  padding: 18px 0;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(16px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  letter-spacing: 0;
}

.brand-mark {
  display: inline-grid;
  width: 36px;
  height: 36px;
  place-items: center;
  border-radius: 10px;
  background: var(--ink);
  color: #ffffff;
  font-size: 13px;
  font-weight: 900;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 22px;
  color: var(--ink-2);
  font-size: 0.95rem;
}

.nav-links a,
.text-link {
  position: relative;
  font-weight: 700;
}

.nav-links a::after,
.text-link::after {
  position: absolute;
  right: 0;
  bottom: -4px;
  left: 0;
  height: 2px;
  background: var(--teal);
  content: "";
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 180ms ease;
}

.nav-links a:hover::after,
.text-link:hover::after {
  transform: scaleX(1);
}

.header-cta,
.button-primary,
.button-secondary,
.amazon-link {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  font-size: 0.95rem;
  font-weight: 800;
  line-height: 1;
  transition:
    transform 180ms ease,
    background 180ms ease,
    border-color 180ms ease;
}

.header-cta,
.button-primary,
.amazon-link {
  border: 1px solid var(--coral);
  background: var(--coral);
  color: #ffffff;
  padding: 0 18px;
}

.button-secondary {
  border: 1px solid var(--line);
  background: #ffffff;
  color: var(--ink);
  padding: 0 18px;
}

.header-cta:hover,
.button-primary:hover,
.button-secondary:hover,
.amazon-link:hover {
  transform: translateY(-1px);
}

.button-primary:hover,
.amazon-link:hover {
  background: var(--coral-dark);
  border-color: var(--coral-dark);
}

.page-section {
  width: min(100% - 32px, var(--max));
  margin: 0 auto;
  padding: 84px 0;
}

.hero {
  display: grid;
  min-height: 680px;
  align-items: center;
  grid-template-columns: minmax(0, 1fr) minmax(340px, 0.95fr);
  gap: 42px;
  width: min(100% - 32px, var(--max));
  margin: 0 auto;
  padding: 62px 0 86px;
}

.hero h1,
.page-hero h1,
.article-header h1 {
  margin: 0;
  color: var(--ink);
  font-size: clamp(3.1rem, 7vw, 6.9rem);
  font-weight: 900;
  letter-spacing: 0;
  line-height: 0.92;
}

.hero h1 {
  max-width: 720px;
  font-size: clamp(3.2rem, 4.7vw, 5rem);
  line-height: 0.96;
}

.hero p,
.page-hero p,
.article-header .lede {
  max-width: 690px;
  margin-top: 24px;
  color: var(--ink-2);
  font-size: clamp(1.08rem, 2vw, 1.35rem);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 34px;
}

.hero-image-wrap {
  position: relative;
}

.hero-image-wrap::before {
  position: absolute;
  inset: 8% 4% -6% 10%;
  z-index: -1;
  border-radius: 42px;
  background: linear-gradient(135deg, var(--bg-blue), #ffffff 70%);
  content: "";
}

.hero-image {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 28px;
  box-shadow: var(--shadow);
}

.hero-image img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.hero-note {
  position: absolute;
  right: 28px;
  bottom: -26px;
  max-width: 270px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: #ffffff;
  box-shadow: var(--shadow);
  padding: 18px;
}

.hero-note strong {
  display: block;
  margin-bottom: 6px;
}

.section-header {
  max-width: 760px;
  margin-bottom: 36px;
}

.section-header.centered {
  margin-right: auto;
  margin-left: auto;
  text-align: center;
}

.section-header h2,
.footer h2 {
  margin: 0;
  color: var(--ink);
  font-size: clamp(2rem, 4vw, 3.6rem);
  font-weight: 900;
  letter-spacing: 0;
  line-height: 1;
}

.section-header p:not(.meta-label) {
  margin-top: 16px;
  color: var(--ink-2);
  font-size: 1.08rem;
}

.meta-label {
  margin-bottom: 10px;
  color: var(--teal-dark);
  font-size: 0.78rem;
  font-weight: 900;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.trust-strip {
  border-block: 1px solid var(--line);
  background: var(--bg-soft);
}

.trust-inner {
  display: grid;
  width: min(100% - 32px, var(--max));
  margin: 0 auto;
  grid-template-columns: repeat(3, 1fr);
}

.trust-item {
  padding: 26px 28px;
  border-right: 1px solid var(--line);
}

.trust-item:first-child {
  border-left: 1px solid var(--line);
}

.trust-item strong {
  display: block;
  margin-bottom: 4px;
  font-size: 1.02rem;
}

.trust-item p {
  color: var(--muted);
  font-size: 0.95rem;
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

.product-card,
.article-card,
.guide-panel,
.city-card,
.disclosure-box,
.source-list,
.faq-item {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: #ffffff;
}

.product-card {
  overflow: hidden;
  transition:
    transform 180ms ease,
    box-shadow 180ms ease;
}

.product-card:hover {
  box-shadow: var(--shadow);
  transform: translateY(-3px);
}

.product-image-link {
  display: block;
  background: linear-gradient(180deg, #f7fcfd, #ffffff);
}

.product-card img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: contain;
  padding: 20px;
}

.product-card-body {
  padding: 20px;
}

.product-card h3,
.article-card h3,
.guide-panel h3,
.city-card h3 {
  margin: 0 0 10px;
  color: var(--ink);
  font-size: 1.32rem;
  line-height: 1.12;
}

.product-card p,
.article-card p,
.guide-panel p,
.city-card p {
  color: var(--muted);
}

.card-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  margin-top: 18px;
}

.amazon-link {
  min-height: 38px;
  padding: 0 14px;
  font-size: 0.82rem;
}

.split-section {
  display: grid;
  align-items: start;
  grid-template-columns: minmax(0, 0.9fr) minmax(320px, 1.1fr);
  gap: 48px;
}

.guide-list {
  display: grid;
  gap: 14px;
}

.guide-panel {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 18px;
  padding: 18px;
}

.guide-panel img {
  width: 110px;
  height: 110px;
  border-radius: 14px;
  background: var(--bg-soft);
  object-fit: contain;
}

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

.article-card {
  overflow: hidden;
}

.article-card img {
  width: 100%;
  aspect-ratio: 16 / 11;
  background: var(--bg-soft);
  object-fit: contain;
  padding: 18px;
}

.article-card > div,
.city-card {
  padding: 22px;
}

.city-card {
  display: flex;
  min-height: 250px;
  flex-direction: column;
  justify-content: space-between;
}

.city-card .text-link {
  margin-top: 18px;
  align-self: flex-start;
}

.band {
  background: var(--bg-soft);
}

.kit-builder {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: var(--line);
}

.kit-step {
  min-height: 260px;
  background: #ffffff;
  padding: 26px;
}

.kit-step span {
  display: grid;
  width: 40px;
  height: 40px;
  place-items: center;
  margin-bottom: 34px;
  border-radius: 50%;
  background: var(--ink);
  color: #ffffff;
  font-weight: 900;
}

.kit-step h3 {
  margin: 0 0 12px;
  font-size: 1.3rem;
  line-height: 1.1;
}

.kit-step p {
  color: var(--muted);
}

.page-hero {
  width: min(100% - 32px, var(--max));
  margin: 0 auto;
  padding: 82px 0 58px;
}

.page-hero h1 {
  max-width: 980px;
  font-size: clamp(3rem, 6vw, 5.4rem);
}

.product-detail {
  display: grid;
  align-items: start;
  grid-template-columns: minmax(320px, 0.85fr) minmax(0, 1.15fr);
  gap: 54px;
}

.product-detail-visual {
  position: sticky;
  top: 92px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 28px;
  background: linear-gradient(180deg, #f7fcfd, #ffffff);
}

.product-detail-visual img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: contain;
  padding: 28px;
}

.detail-block {
  padding: 28px 0;
  border-bottom: 1px solid var(--line);
}

.detail-block:first-child {
  padding-top: 0;
}

.detail-block h2 {
  margin: 0 0 16px;
  font-size: 1.7rem;
  line-height: 1.1;
}

.check-list,
.article-body ul,
.source-list ul {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.check-list li,
.article-body li,
.source-list li {
  position: relative;
  padding-left: 26px;
  color: var(--ink-2);
}

.check-list li::before,
.article-body li::before,
.source-list li::before {
  position: absolute;
  top: 0.7em;
  left: 2px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--teal);
  content: "";
}

.disclosure-box {
  margin: 28px 0;
  padding: 18px 20px;
  background: #fff8f6;
  color: var(--ink-2);
}

.disclosure-box strong {
  color: var(--ink);
}

.article-layout {
  display: grid;
  grid-template-columns: minmax(0, 760px) 320px;
  gap: 52px;
  width: min(100% - 32px, var(--max));
  margin: 0 auto;
  padding: 34px 0 86px;
}

.article-header {
  width: min(100% - 32px, 980px);
  margin: 0 auto;
  padding: 82px 0 26px;
}

.article-header h1 {
  font-size: clamp(2.7rem, 5vw, 5.2rem);
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 16px;
  color: var(--teal-dark);
  font-size: 0.88rem;
  font-weight: 800;
}

.article-body {
  color: var(--ink-2);
  font-size: 1.1rem;
}

.article-body section {
  padding: 34px 0;
  border-bottom: 1px solid var(--line);
}

.article-body h2 {
  margin: 0 0 16px;
  color: var(--ink);
  font-size: 2rem;
  line-height: 1.08;
}

.article-body p + p {
  margin-top: 14px;
}

.article-body ul {
  margin-top: 18px;
}

.article-sidebar {
  position: sticky;
  top: 96px;
  align-self: start;
}

.sidebar-card {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: #ffffff;
}

.sidebar-card img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: contain;
  padding: 22px;
}

.sidebar-card div {
  padding: 20px;
}

.source-list {
  margin-top: 28px;
  padding: 22px;
  background: var(--bg-soft);
}

.source-list h2 {
  margin: 0 0 12px;
  font-size: 1.25rem;
}

.faq-list {
  display: grid;
  gap: 12px;
  margin-top: 24px;
}

.faq-item {
  padding: 20px;
}

.faq-item h3 {
  margin: 0 0 8px;
  font-size: 1.08rem;
}

.city-hero-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 360px;
  gap: 32px;
  align-items: center;
  border: 1px solid var(--line);
  border-radius: 28px;
  background: var(--bg-soft);
  padding: 28px;
}

.city-hero-card img {
  border-radius: 22px;
  background: #ffffff;
  object-fit: contain;
}

.footer {
  border-top: 1px solid var(--line);
  background: var(--ink);
  color: #ffffff;
  padding: 62px 0;
}

.footer-grid {
  display: grid;
  width: min(100% - 32px, var(--max));
  margin: 0 auto;
  grid-template-columns: 1.4fr repeat(3, 1fr);
  gap: 42px;
}

.footer .brand-mark {
  background: #ffffff;
  color: var(--ink);
}

.footer p,
.footer a {
  display: block;
  color: rgba(255, 255, 255, 0.76);
}

.footer a {
  margin-top: 10px;
}

.footer h2 {
  margin-bottom: 12px;
  color: #ffffff;
  font-size: 1rem;
}

.footer-brand {
  margin-bottom: 18px;
}

.small-copy {
  margin-top: 16px;
  font-size: 0.9rem;
}

@media (max-width: 980px) {
  .site-header {
    align-items: flex-start;
    flex-wrap: wrap;
  }

  .nav-links {
    order: 3;
    width: 100%;
    overflow-x: auto;
    padding-bottom: 4px;
  }

  .hero,
  .split-section,
  .product-detail,
  .article-layout,
  .city-hero-card {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
    padding-top: 42px;
  }

  .hero-note,
  .product-detail-visual,
  .article-sidebar {
    position: static;
  }

  .product-grid,
  .article-grid,
  .city-grid,
  .kit-builder,
  .trust-inner,
  .footer-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .trust-item:first-child,
  .trust-item {
    border: 0;
    border-bottom: 1px solid var(--line);
  }
}

@media (max-width: 640px) {
  .header-cta {
    display: none;
  }

  .page-section {
    padding: 58px 0;
  }

  .hero {
    gap: 34px;
  }

  .hero h1,
  .page-hero h1,
  .article-header h1 {
    font-size: 3rem;
    line-height: 0.98;
  }

  .hero-note {
    margin-top: 14px;
    max-width: none;
  }

  .product-grid,
  .article-grid,
  .city-grid,
  .kit-builder,
  .trust-inner,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .guide-panel {
    grid-template-columns: 88px 1fr;
  }

  .guide-panel img {
    width: 88px;
    height: 88px;
  }
}