:root {
  --paper: #fff9ea;
  --ink: #293241;
  --muted: #667085;
  --line: rgba(41, 50, 65, 0.16);
  --yellow: #f7d35f;
  --coral: #ff7a6b;
  --sky: #7dc8e8;
  --mint: #84c7a1;
  --plum: #7b5ea7;
  --white: #fffdf6;
  --shadow: 0 18px 50px rgba(41, 50, 65, 0.12);
  font-family: "Noto Sans JP", system-ui, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(90deg, rgba(125, 200, 232, 0.12) 1px, transparent 1px),
    linear-gradient(rgba(247, 211, 95, 0.14) 1px, transparent 1px),
    var(--paper);
  background-size: 42px 42px;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(circle at 8% 12%, rgba(255, 122, 107, 0.22), transparent 24rem),
    radial-gradient(circle at 92% 18%, rgba(132, 199, 161, 0.22), transparent 26rem),
    radial-gradient(circle at 82% 80%, rgba(125, 200, 232, 0.18), transparent 28rem);
  z-index: -2;
}

a {
  color: inherit;
}

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

.skip-link {
  position: fixed;
  left: 1rem;
  top: 1rem;
  transform: translateY(-150%);
  z-index: 20;
  background: var(--ink);
  color: var(--white);
  padding: 0.75rem 1rem;
}

.skip-link:focus {
  transform: none;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
  padding: 0.58rem clamp(1rem, 4vw, 3rem);
  border-bottom: 1px solid transparent;
  transition: background 180ms ease, border-color 180ms ease;
}

.site-header.is-scrolled {
  background: rgba(255, 249, 234, 0.9);
  border-color: var(--line);
  backdrop-filter: blur(12px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  min-height: 36px;
  text-decoration: none;
  font-weight: 900;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  background: var(--yellow);
  border: 2px solid var(--ink);
  box-shadow: 3px 3px 0 var(--ink);
  font-family: "M PLUS Rounded 1c", sans-serif;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.34rem;
}

.button,
.tab {
  min-height: 44px;
  border: 2px solid var(--ink);
  border-radius: 8px;
  text-decoration: none;
  font-weight: 800;
}

.nav-links a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 34px;
  padding: 0.34rem 0.7rem;
  background: rgba(255, 253, 246, 0.72);
  border: 1.5px solid var(--ink);
  border-radius: 999px;
  text-decoration: none;
  font-size: 0.82rem;
  font-weight: 900;
  white-space: nowrap;
}

.hero {
  position: relative;
  min-height: min(610px, calc(100svh - 2rem));
  display: grid;
  grid-template-columns: 1fr;
  align-items: center;
  padding: clamp(3.5rem, 8vw, 7rem) clamp(1rem, 5vw, 5rem) clamp(3rem, 7vw, 5rem);
  overflow: hidden;
}

.hero-art {
  position: absolute;
  inset: 0;
  z-index: -1;
}

.hero-art img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-art::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(255, 249, 234, 0.97) 0%, rgba(255, 249, 234, 0.78) 38%, rgba(255, 249, 234, 0.1) 78%),
    linear-gradient(0deg, var(--paper) 0%, transparent 24%);
}

.hero-copy {
  max-width: 760px;
}

.eyebrow,
.section-kicker {
  margin: 0 0 1rem;
  font-size: 0.78rem;
  font-weight: 900;
  letter-spacing: 0.12em;
  color: var(--plum);
}

h1,
h2,
h3,
p {
  overflow-wrap: anywhere;
}

h1 {
  max-width: 12ch;
  margin: 0;
  font-family: "M PLUS Rounded 1c", sans-serif;
  font-size: clamp(3rem, 7.6vw, 7rem);
  line-height: 0.98;
  letter-spacing: 0;
}

h1 span {
  display: block;
  white-space: nowrap;
}

h2 {
  margin: 0;
  font-family: "M PLUS Rounded 1c", sans-serif;
  font-size: clamp(2rem, 4.8vw, 4.8rem);
  line-height: 1.05;
  letter-spacing: 0;
}

h3 {
  margin: 0 0 0.75rem;
  font-size: clamp(1.12rem, 2vw, 1.45rem);
}

.lead {
  max-width: 46rem;
  margin: 1.5rem 0 0;
  color: #415064;
  font-size: clamp(1.05rem, 1.8vw, 1.28rem);
  line-height: 1.9;
  font-weight: 700;
}

.lead-mobile {
  display: none;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  padding: 0.85rem 1.1rem;
  box-shadow: 4px 4px 0 var(--ink);
  transition: transform 160ms ease, box-shadow 160ms ease;
}

.button:hover {
  transform: translate(2px, 2px);
  box-shadow: 2px 2px 0 var(--ink);
}

.primary {
  background: var(--yellow);
}

.secondary {
  background: var(--white);
}

.event-card {
  justify-self: end;
  width: min(100%, 330px);
  margin-top: 15rem;
  padding: 1rem;
  background: var(--white);
  border: 2px solid var(--ink);
  border-radius: 8px;
  box-shadow: 8px 8px 0 var(--coral);
}

.mascot-card {
  position: relative;
  margin-top: 9rem;
  padding-top: 3.8rem;
}

.guide-crop {
  position: relative;
  width: min(100%, 220px);
  aspect-ratio: 1;
  margin: 0 auto 0.75rem;
  overflow: hidden;
  background: transparent;
  filter: drop-shadow(0 12px 16px rgba(41, 50, 65, 0.16));
}

.mascot-card > .guide-crop {
  position: absolute;
  top: -8.8rem;
  left: 50%;
  width: 220px;
  transform: translateX(-50%);
  z-index: 2;
}

.guide-crop img {
  position: absolute;
  left: 0;
  top: 50%;
  max-width: none;
  width: 340%;
  height: auto;
}

.guide-wave img {
  transform: translate(0, -50%);
}

.guide-point img {
  transform: translate(-33.333%, -50%);
}

.guide-caution img {
  transform: translate(-66.666%, -50%);
}

.event-card p {
  margin: 0 0 0.8rem;
  font-weight: 900;
}

.event-card dl {
  margin: 0;
}

.event-card dl div {
  display: grid;
  grid-template-columns: 4.4rem 1fr;
  gap: 0.75rem;
  padding: 0.65rem 0;
  border-top: 1px dashed var(--line);
}

.event-card dt {
  color: var(--muted);
  font-weight: 800;
}

.event-card dd {
  margin: 0;
  font-weight: 900;
}

.notice-band,
.closing {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
  margin: 0 clamp(1rem, 5vw, 5rem);
  padding: 1rem;
  background: var(--ink);
  color: var(--white);
  border-radius: 8px;
}

.inline-notice {
  margin: 1rem 0 1.4rem;
}

.seller-important {
  justify-content: center;
  gap: clamp(0.85rem, 2vw, 1.35rem);
  margin: 1rem 0 0.9rem;
  background: #fff0a8;
  color: var(--ink);
  border: 2px solid var(--ink);
  box-shadow: 6px 6px 0 var(--coral);
}

.seller-important .notice-label {
  background: var(--coral);
  color: var(--white);
  border: 2px solid var(--ink);
}

.seller-important p {
  font-weight: 900;
  text-align: left;
}

.common-summary {
  margin: -0.4rem 0 1rem;
  padding: 1rem;
  background: var(--white);
  border: 2px solid var(--ink);
  border-radius: 8px;
  box-shadow: 8px 8px 0 var(--sky);
}

.common-summary dl {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
  margin: 0;
}

.common-summary div {
  padding: 0.9rem;
  background: #f8f2e2;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.common-summary dt {
  color: var(--plum);
  font-weight: 900;
}

.common-summary dd {
  margin: 0.15rem 0 0;
  font-weight: 900;
  line-height: 1.6;
}

.notice-band p {
  margin: 0;
  line-height: 1.7;
}

.notice-label {
  flex: 0 0 auto;
  padding: 0.45rem 0.65rem;
  background: var(--yellow);
  color: var(--ink);
  border-radius: 4px;
  font-weight: 900;
}

.section {
  scroll-margin-top: 6rem;
  padding: clamp(4.5rem, 9vw, 8rem) clamp(1rem, 5vw, 5rem);
}

.section-heading {
  position: relative;
  max-width: 860px;
  margin-bottom: 2rem;
}

.section-heading.compact {
  max-width: 680px;
}

.section-heading p:not(.section-kicker) {
  color: #4b5b70;
  font-size: 1.05rem;
  line-height: 1.9;
  font-weight: 600;
}

.section-title-row {
  display: flex;
  align-items: center;
  gap: clamp(0.55rem, 1.5vw, 1rem);
}

.section-title-row h2 {
  flex: 0 1 auto;
}

.section-futaba {
  flex: 0 0 auto;
  width: clamp(74px, 9vw, 116px);
  height: clamp(74px, 9vw, 116px);
  object-fit: contain;
  filter: drop-shadow(0 8px 10px rgba(41, 50, 65, 0.12));
  pointer-events: none;
}

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

.event-summary {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 1.2rem;
  align-items: center;
  margin-bottom: 1.25rem;
  padding: 1rem;
  background: var(--white);
  border: 2px solid var(--ink);
  border-radius: 8px;
  box-shadow: 8px 8px 0 var(--sky);
}

.event-summary .guide-crop {
  width: 100%;
  aspect-ratio: 1.15;
  margin: 0;
}

.event-summary dl {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.65rem;
  margin: 0;
}

.event-summary dl div {
  min-height: 88px;
  padding: 0.8rem;
  background: #f8f2e2;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.event-summary dt {
  color: var(--plum);
  font-weight: 900;
}

.event-summary dd {
  margin: 0.25rem 0 0;
  font-weight: 800;
  line-height: 1.65;
}

.feature-card,
.booth-panel,
.prohibited-card,
.rule-card,
.faq-list details {
  border: 2px solid var(--ink);
  border-radius: 8px;
  background: var(--white);
  box-shadow: var(--shadow);
}

.feature-card {
  min-height: 260px;
  padding: 1.4rem;
  color: inherit;
  text-decoration: none;
  transition: transform 160ms ease, box-shadow 160ms ease;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: 8px 8px 0 var(--ink);
}

.feature-card span {
  display: inline-grid;
  place-items: center;
  width: 3.1rem;
  height: 3.1rem;
  margin-bottom: 1.6rem;
  border: 2px solid var(--ink);
  background: var(--white);
  font-weight: 900;
}

.feature-card .pose-icon {
  width: 5.6rem;
  height: 5.6rem;
  margin-bottom: 1.2rem;
  border: 0;
  background: transparent;
  box-shadow: none;
}

.pose-icon img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  filter: drop-shadow(0 6px 6px rgba(41, 50, 65, 0.12));
}

.feature-card p,
.tab-panel p,
.timeline p,
.faq-list p,
.closing p {
  color: #46566b;
  line-height: 1.85;
}

.feature-card.yellow {
  background: #fff0a8;
}

.feature-card.blue {
  background: #c9ecf8;
}

.feature-card.green {
  background: #d7f0df;
}

.split {
  display: block;
}

.split .section-heading {
  max-width: 960px;
}

.seller-facts {
  display: grid;
  gap: 0.65rem;
  margin: 1.25rem 0 0;
}

.seller-facts div {
  padding: 0.8rem;
  background: var(--white);
  border: 2px solid var(--ink);
  border-radius: 8px;
  box-shadow: 4px 4px 0 var(--yellow);
}

.seller-facts dt {
  color: var(--plum);
  font-weight: 900;
}

.seller-facts dd {
  margin: 0.15rem 0 0;
  line-height: 1.65;
}

.seller-facts dd strong {
  display: block;
  font-family: "M PLUS Rounded 1c", sans-serif;
  font-size: clamp(1.28rem, 2.2vw, 1.65rem);
  font-weight: 900;
  line-height: 1.25;
}

.seller-facts dd span {
  display: block;
  margin-top: 0.35rem;
  color: #4b5b70;
  font-size: 0.95rem;
  font-weight: 800;
  line-height: 1.65;
}

.booth-panel {
  overflow: hidden;
  max-width: 1060px;
  margin-top: clamp(1.6rem, 3vw, 2.4rem);
  padding: 0;
}

.tabs {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.35rem;
  padding: 0.55rem 0.55rem 0;
  background: #f8f2e2;
}

.tab {
  --tab-color: var(--yellow);
  position: relative;
  cursor: pointer;
  min-height: 46px;
  padding: 0.62rem 0.5rem;
  background: color-mix(in srgb, var(--tab-color) 38%, var(--white));
  color: var(--ink);
  font: inherit;
  border-bottom: 2px solid var(--ink);
  border-radius: 8px 8px 0 0;
  box-shadow: none;
  transform: translateY(2px);
  transition: background 160ms ease, transform 160ms ease;
}

.tab[data-tab="items"],
.tab-panel[data-panel="items"] {
  --tab-color: #fff0a8;
}

.tab[data-tab="money"],
.tab-panel[data-panel="money"] {
  --tab-color: #c9ecf8;
}

.tab[data-tab="booth"],
.tab-panel[data-panel="booth"] {
  --tab-color: #d7f0df;
}

.tab.is-active {
  background: var(--tab-color);
  border-bottom-color: transparent;
  transform: translateY(0);
  z-index: 1;
}

.tab-panels {
  padding: clamp(1.1rem, 2.8vw, 1.8rem);
}

.tab-panel {
  display: none;
  padding: clamp(1rem, 2.2vw, 1.25rem);
  background: color-mix(in srgb, var(--tab-color) 78%, var(--white));
  border: 2px solid var(--ink);
  border-radius: 8px;
  box-shadow: 5px 5px 0 color-mix(in srgb, var(--tab-color) 70%, var(--ink));
}

.tab-panel.is-active {
  display: block;
}

.tab-panel h3 {
  display: inline-block;
  margin-bottom: 0.65rem;
  padding: 0.35rem 0.65rem;
  background: var(--white);
  border: 2px solid var(--ink);
  border-radius: 6px;
}

.item-groups {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 0.75rem;
  margin-top: 0.35rem;
}

.item-groups section {
  padding: 0.85rem;
  background: rgba(255, 253, 246, 0.74);
  border: 1.5px solid var(--ink);
  border-radius: 8px;
}

.item-groups h4 {
  margin: 0 0 0.35rem;
  color: var(--plum);
  font-size: 1rem;
  font-weight: 900;
}

.item-groups p {
  margin: 0;
}

.tab-note {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin: 0.9rem 0 0;
  padding: 0.75rem 0.85rem;
  background: var(--white);
  border-left: 6px solid var(--coral);
  border-radius: 8px;
  font-weight: 900;
}

.tab-note p {
  margin: 0;
}

.chat-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0.55rem 0.9rem;
  background: var(--coral);
  color: var(--white);
  border: 2px solid var(--ink);
  border-radius: 999px;
  box-shadow: 3px 3px 0 var(--ink);
  text-decoration: none;
  font-weight: 900;
  line-height: 1.2;
}

.chat-button:hover {
  transform: translate(1px, 1px);
  box-shadow: 2px 2px 0 var(--ink);
}

.tab-panel ul {
  display: grid;
  gap: 0.65rem;
  padding-left: 1.3rem;
  font-weight: 700;
}

.color-field {
  background: #ffd8d3;
  border-block: 2px solid var(--ink);
}

.prohibited-grid,
.rule-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
}

.section-helper {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin: -0.5rem 0 1.25rem;
  padding: 0.8rem 1rem;
  background: var(--white);
  border: 2px solid var(--ink);
  border-radius: 8px;
  box-shadow: 6px 6px 0 var(--yellow);
}

.section-helper .guide-crop {
  flex: 0 0 96px;
  width: 96px;
  margin: 0;
}

.helper-futaba {
  flex: 0 0 96px;
  width: 96px;
  height: 96px;
  object-fit: contain;
  filter: drop-shadow(0 8px 10px rgba(41, 50, 65, 0.12));
}

.section-helper p {
  margin: 0;
  font-weight: 900;
  line-height: 1.7;
}

.section-helper-content {
  display: flex;
  flex: 1;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.prohibited-card {
  min-height: 230px;
  padding: 1.2rem;
}

.rule-card {
  min-height: 170px;
  padding: 1rem;
}

.prohibited-card {
  background: var(--white);
}

.prohibited-card.legal-focus {
  background: #fff0a8;
  box-shadow: 8px 8px 0 var(--coral);
}

.card-badge {
  display: inline-block;
  margin: -0.25rem 0 0.85rem;
  padding: 0.32rem 0.55rem;
  background: var(--ink);
  color: var(--white);
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 900;
}

.prohibited-card strong {
  display: grid;
  place-items: center;
  width: 3rem;
  height: 3rem;
  margin-bottom: 1rem;
  border-radius: 999px;
  background: var(--coral);
  color: var(--white);
  border: 2px solid var(--ink);
  font-size: 1.5rem;
}

.rule-card:nth-child(1) {
  background: #fff0a8;
}

.rule-card:nth-child(2) {
  background: #c9ecf8;
}

.rule-card:nth-child(3) {
  background: #d7f0df;
}

.rule-card:nth-child(4) {
  background: #f4d8ff;
}

.rule-card.refund-rule {
  background: #ffd8d3;
}

.timeline {
  position: relative;
  display: grid;
  gap: 1rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 5rem;
  top: 1rem;
  bottom: 1rem;
  width: 3px;
  background: var(--ink);
}

.timeline li {
  position: relative;
  display: grid;
  grid-template-columns: 8rem 1fr;
  gap: 1rem;
  align-items: start;
}

.timeline time {
  display: inline-grid;
  place-items: center;
  min-height: 48px;
  background: var(--yellow);
  border: 2px solid var(--ink);
  border-radius: 8px;
  font-weight: 900;
  z-index: 1;
}

.timeline div {
  padding: 1rem;
  background: var(--white);
  border: 2px solid var(--ink);
  border-radius: 8px;
}

.timeline p {
  margin: 0;
}

.worksheet-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 1.25rem;
  align-items: center;
  margin-top: 1rem;
  padding: 1.2rem;
  background: #eef8fb;
  border: 2px solid var(--ink);
  border-radius: 8px;
  box-shadow: 8px 8px 0 var(--sky);
}

.worksheet-card h3 {
  margin-bottom: 0.3rem;
}

.worksheet-card p {
  margin: 0;
  line-height: 1.8;
}

.worksheet-label {
  display: inline-block;
  margin-bottom: 0.45rem;
  padding: 0.25rem 0.55rem;
  background: var(--yellow);
  border: 2px solid var(--ink);
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 900;
}

.worksheet-actions {
  display: grid;
  gap: 0.65rem;
  min-width: min(100%, 220px);
}

.faq-section {
  background: #d9f1f7;
}

.faq-list {
  display: grid;
  gap: 0.75rem;
}

.faq-list details {
  padding: 1rem 1.1rem;
}

.faq-list summary {
  cursor: pointer;
  min-height: 44px;
  font-weight: 900;
}

.closing {
  scroll-margin-top: 6rem;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  margin-top: 2rem;
  margin-bottom: 2rem;
  padding: clamp(1.25rem, 3vw, 2rem);
  background: var(--white);
  color: var(--ink);
  box-shadow: 8px 8px 0 var(--mint);
}

.closing p {
  margin-bottom: 0;
}

.closing-actions {
  display: grid;
  gap: 0.7rem;
  min-width: min(100%, 280px);
}

.button.is-pending {
  cursor: default;
}

.back-link {
  grid-column: 1 / -1;
  justify-self: end;
  color: var(--muted);
  font-weight: 900;
  text-decoration: none;
}

.back-link:hover {
  color: var(--ink);
}

.footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
  padding: 2rem clamp(1rem, 5vw, 5rem);
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-weight: 700;
}

.footer p {
  margin: 0;
}

.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 700ms cubic-bezier(0.22, 1, 0.36, 1), transform 700ms cubic-bezier(0.22, 1, 0.36, 1);
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}

@media (max-width: 940px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
  }

  .nav-links {
    justify-content: flex-start;
  }

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

  .hero {
    min-height: auto;
  }

  .event-card {
    justify-self: start;
    margin-top: 0;
  }

  .overview-grid,
  .event-summary dl,
  .prohibited-grid,
  .rule-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .worksheet-card {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 620px) {
  .site-header {
    gap: 0.5rem;
    padding: 0.52rem 0.75rem 0.62rem;
  }

  .brand {
    width: 100%;
    font-size: 0.95rem;
  }

  .brand-mark {
    width: 31px;
    height: 31px;
    box-shadow: 2px 2px 0 var(--ink);
  }

  .nav-links {
    display: grid;
    grid-template-columns: repeat(6, minmax(0, 1fr));
    width: 100%;
    gap: 0.22rem;
    overflow: visible;
    padding-bottom: 0;
  }

  .nav-links a {
    min-width: 0;
    justify-content: center;
    min-height: 31px;
    padding: 0.24rem 0.1rem;
    font-size: 0.62rem;
    line-height: 1.25;
    text-align: center;
  }

  .nav-links a:nth-child(1) {
    grid-column: span 3;
  }

  .nav-links a:nth-child(2) {
    grid-column: span 3;
  }

  .nav-links a:nth-child(3) {
    grid-column: span 2;
  }

  .nav-links a:nth-child(4) {
    grid-column: span 2;
  }

  .nav-links a:nth-child(5) {
    grid-column: span 2;
  }

  .hero {
    padding-top: 2.5rem;
    padding-inline: 1.25rem;
  }

  .section {
    scroll-margin-top: 9.4rem;
  }

  .closing {
    grid-template-columns: 1fr;
    scroll-margin-top: 9.4rem;
  }

  h1 {
    max-width: 100%;
    font-size: clamp(2.45rem, 11.5vw, 3.2rem);
    line-height: 1.03;
  }

  .lead {
    max-width: none;
    font-size: clamp(0.88rem, 3.8vw, 0.98rem);
    line-height: 1.78;
    font-weight: 800;
  }

  .lead-desktop {
    display: none;
  }

  .lead-mobile,
  .lead-mobile span {
    display: block;
  }

  .section-title-row {
    flex-wrap: nowrap;
    gap: 0.45rem;
  }

  .section-title-row h2 {
    min-width: 0;
    font-size: clamp(1.48rem, 6.7vw, 1.72rem);
    line-height: 1.08;
    white-space: nowrap;
  }

  .section-futaba {
    width: clamp(58px, 17vw, 74px);
    height: clamp(58px, 17vw, 74px);
  }

  .hero-actions,
  .notice-band,
  .closing,
  .footer {
    align-items: stretch;
    flex-direction: column;
  }

  .seller-important {
    align-items: center;
    text-align: center;
  }

  .seller-important p {
    text-align: center;
  }

  .hero-actions .button {
    width: calc(100% - 6px);
  }

  .common-summary dl {
    grid-template-columns: 1fr;
  }

  .mascot-card {
    margin-top: 7rem;
    padding-top: 3.4rem;
  }

  .guide-crop {
    width: min(100%, 190px);
    margin-top: 0;
  }

  .mascot-card > .guide-crop {
    top: -6.7rem;
    width: 190px;
  }

  .event-summary {
    grid-template-columns: 1fr;
  }

  .event-summary .guide-crop,
  .section-helper .guide-crop,
  .helper-futaba {
    margin: 0 auto;
  }

  .section-helper {
    align-items: stretch;
    flex-direction: column;
  }

  .section-helper-content {
    align-items: stretch;
    flex-direction: column;
  }

  .tabs {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0.2rem;
    padding-inline: 0.35rem;
  }

  .tab {
    min-height: 40px;
    padding-inline: 0.25rem;
    font-size: 0.9rem;
  }

  .overview-grid,
  .prohibited-grid,
  .rule-grid,
  .item-groups {
    grid-template-columns: 1fr;
  }

  .timeline::before {
    left: 1.45rem;
  }

  .timeline li {
    grid-template-columns: 1fr;
    padding-left: 3rem;
  }

  .timeline time {
    position: absolute;
    left: 0;
    width: 3rem;
    min-height: 3rem;
    font-size: 0.72rem;
  }
}