:root {
  --navy: #082f82;
  --blue: #0758b8;
  --orange: #f45a0b;
  --pink: #eb2877;
  --yellow: #ffe100;
  --line: #8bc8ef;
  --pale: #f3faff;
  --ink: #111827;
  --container: 1200px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: #fff;
  color: var(--ink);
  font-family: "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif;
  font-weight: 600;
  line-height: 1.7;
}
img { display: block; max-width: 100%; }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}
.container {
  width: min(calc(100% - 40px), var(--container));
  margin-inline: auto;
}
.hero {
  padding: 24px 0 10px;
  background: linear-gradient(180deg, #e9f8ff 0%, #fff 100%);
}
.hero__frame {
  overflow: hidden;
  border-radius: 18px;
  box-shadow: 0 14px 34px rgba(3, 54, 120, .14);
}
.hero__image { width: 100%; height: auto; }
.section { padding: 34px 0 0; }
.overview__inner {
  overflow: hidden;
  border: 2px solid #c5e6f8;
  border-radius: 18px;
  background: #fff;
  text-align: center;
}
.overview__introduction {
  padding: 30px 42px 26px;
  background: linear-gradient(145deg, #fff 10%, #edf8ff 100%);
}
.overview__introduction h2 {
  max-width: 1000px;
  margin: 0 auto 16px;
  color: var(--navy);
  font-size: clamp(23px, 2.5vw, 34px);
  font-weight: 900;
  line-height: 1.5;
}
.overview__introduction > p {
  max-width: 960px;
  margin: 0 auto;
  font-size: 16px;
  line-height: 1.85;
}
.overview__organizer { display: inline-block; font-size: 14px; }
.overview__introduction > .overview__ranking {
  margin-top: 17px;
  color: var(--blue);
  font-size: 15px;
  font-weight: 900;
}
.overview__reward {
  padding: 23px 35px 25px;
  border-top: 1px solid #ffd0e1;
  background: linear-gradient(145deg, #fff 10%, #fff2f7 100%);
}
.overview__reward p { margin: 0; font-size: 15px; font-weight: 800; line-height: 1.9; }
.overview__reward .overview__reward-highlight {
  margin: 4px 0;
  color: var(--pink);
  font-size: clamp(17px, 2.1vw, 25px);
  font-weight: 900;
  line-height: 1.65;
}
.overview__reward-highlight strong { font-family: Arial, sans-serif; font-size: 1.22em; }
.section-title-row {
  display: grid;
  grid-template-columns: minmax(30px, 1fr) auto minmax(30px, 1fr);
  align-items: center;
  gap: 18px;
  margin-bottom: 20px;
  color: var(--navy);
}
.section-title-row span { height: 2px; background: linear-gradient(90deg, transparent, #2f65b7); }
.section-title-row span:last-child { background: linear-gradient(90deg, #2f65b7, transparent); }
.section-title-row h2 {
  margin: 0;
  font-size: clamp(24px, 3vw, 38px);
  font-weight: 900;
  line-height: 1.25;
  text-align: center;
  letter-spacing: .03em;
}
.challenge-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}
.challenge-card {
  position: relative;
  min-height: auto;
  overflow: hidden;
  border: 2px solid var(--line);
  border-radius: 18px;
  background: linear-gradient(145deg, #fff 15%, #eef8ff 100%);
}
.challenge-card--walk { border-color: #ff9d68; }
.challenge-card__content {
  position: relative;
  z-index: 1;
  width: 100%;
  padding: 28px 22px 22px 34px;
  text-align: center;
}
.challenge-card__eyebrow {
  margin: 0 0 8px;
  color: var(--orange);
  font-size: clamp(22px, 2.4vw, 32px);
  font-weight: 900;
}
.challenge-card--run .challenge-card__eyebrow { color: var(--blue); }
.challenge-card__app {
  margin: 0 0 10px;
  color: #111;
  font-size: 14px;
  font-weight: 800;
  line-height: 1.15;
}
.challenge-card__app strong { display: block; font-size: 36px; }
.challenge-card__app--tatta {
  color: var(--blue);
  font-family: Arial, sans-serif;
  font-size: 41px;
  font-weight: 900;
}
.challenge-card__label { margin: 8px 0 0; font-size: 15px; }
.challenge-card__target {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 5px;
  margin: 0;
  color: var(--orange);
  font-family: Arial, sans-serif;
  line-height: 1;
}
.challenge-card--run .challenge-card__target { color: var(--blue); }
.challenge-card__target strong { font-size: clamp(40px, 5vw, 66px); letter-spacing: -.05em; }
.challenge-card__target span { font-size: 20px; font-weight: 900; }
.challenge-card__note { margin: 18px 0 0; font-size: 14px; line-height: 1.6; }
.challenge-card__download { margin-top: 18px; }
.challenge-card__download > p {
  margin: 0 0 8px;
  color: #37465e;
  font-size: 14px;
  font-weight: 900;
  line-height: 1.55;
}
.challenge-card__download > a {
  display: inline-block;
  padding: 9px 12px;
  border: 1px solid currentColor;
  border-radius: 999px;
  background: rgba(255, 255, 255, .95);
  color: var(--orange);
  font-size: 14px;
  font-weight: 900;
  line-height: 1.5;
  text-decoration: none;
  transition: background .2s ease, color .2s ease;
}
.challenge-card--run .challenge-card__download > a { color: var(--blue); }
.challenge-card__download > a:hover,
.challenge-card__download > a:focus-visible { background: var(--orange); color: #fff; }
.challenge-card--run .challenge-card__download > a:hover,
.challenge-card--run .challenge-card__download > a:focus-visible { background: var(--blue); color: #fff; }
.challenge-card__person {
  position: absolute;
  z-index: 0;
  right: -5%;
  bottom: -2%;
  width: 42%;
  max-height: 94%;
  object-fit: contain;
  object-position: bottom right;
}
.challenge-card--walk .challenge-card__content {
  width: 100%;
  margin-left: auto;
  padding-right: 22px;
  padding-left: 10px;
}
.challenge-card__person--walk {
  right: auto;
  left: 3%;
  width: 32%;
  max-height: 90%;
  object-position: bottom left;
}
.challenge-card__person--run {
  right: 1%;
  width: 34%;
  max-height: 90%;
}
.event-entry__inner {
  padding: 20px 24px;
  border: 2px solid #c5e6f8;
  border-radius: 16px;
  background: linear-gradient(145deg, #fff, #f3faff);
  color: var(--navy);
  text-align: center;
}
.event-entry__inner > p { margin: 0 0 8px; font-size: 18px; font-weight: 900; }
.event-entry__inner a {
  color: var(--blue);
  font-weight: 900;
  text-decoration-thickness: 2px;
  text-underline-offset: 4px;
}
.event-entry__official { display: inline-block; font-size: 15px; }
.step-grid {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 0;
  overflow: hidden;
  margin: 0;
  padding: 0;
  border: 2px solid var(--line);
  border-radius: 18px;
  background: #fff;
  list-style: none;
}
.step-card {
  position: relative;
  min-height: 300px;
  padding: 22px 14px 18px;
  text-align: center;
}
.step-card + .step-card { border-left: 1px solid #cfe9fa; }
.step-card__number {
  display: grid;
  width: 38px;
  height: 38px;
  margin: 0 auto 20px;
  place-items: center;
  border-radius: 50%;
  background: var(--pink);
  color: #fff;
  font-family: Arial, sans-serif;
  font-weight: 900;
}
.step-card__icon {
  display: grid;
  width: 88px;
  height: 88px;
  margin: 0 auto 18px;
  place-items: center;
  border-radius: 22px;
  background: linear-gradient(145deg, #eff9ff, #d6efff);
  box-shadow: inset 0 0 0 1px #b9dff7;
}
.step-card__icon img { width: 72px; height: 72px; object-fit: contain; }
.step-card h3 { margin: 0; color: #0b225b; font-size: 15px; line-height: 1.55; }
.step-card p { margin: 10px 0 0; color: #53627b; font-size: 14px; line-height: 1.55; }
.participation__reward {
  margin: 14px 0 0;
  color: var(--pink);
  font-size: clamp(15px, 2vw, 21px);
  font-weight: 900;
  text-align: center;
}

.panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(430px, 1fr);
  align-items: center;
  gap: 38px;
  padding: 38px 42px;
  border: 2px solid var(--line);
  border-radius: 18px;
  background:
    radial-gradient(circle at 95% 10%, rgba(70, 181, 239, .16), transparent 36%),
    linear-gradient(145deg, #fff, var(--pale));
}
.section-kicker {
  margin: 0 0 2px;
  color: var(--pink);
  font-size: 14px;
  font-weight: 900;
  letter-spacing: .08em;
}
.registration h2 {
  margin: 0 0 14px;
  color: var(--navy);
  font-size: clamp(26px, 3vw, 38px);
  font-weight: 900;
  line-height: 1.3;
}
.registration__intro > p:not(.section-kicker) { margin: 0; font-size: 15px; }
.note-list {
  display: grid;
  gap: 6px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}
.note-list li {
  position: relative;
  padding-left: 21px;
  font-size: 14px;
}
.note-list li::before {
  position: absolute;
  left: 0;
  color: var(--pink);
  content: "●";
  font-size: 14px;
}
.app-downloads { display: grid; grid-template-columns: repeat(2, minmax(195px, 1fr)); gap: 16px; }
.download-card {
  display: flex;
  min-height: 270px;
  align-items: center;
  justify-content: center;
  padding: 12px 8px;
  border: 1px solid #b9dcf4;
  border-radius: 12px;
  background: #fff;
  color: var(--navy);
  text-align: center;
  text-decoration: none;
  flex-direction: column;
  transition: transform .2s ease, box-shadow .2s ease;
}
.download-card:hover,
.download-card:focus-visible { transform: translateY(-3px); box-shadow: 0 10px 22px rgba(5, 67, 145, .13); }
.download-card:focus-visible,
.challenge-card__download > a:focus-visible,
.event-entry__inner a:focus-visible,
.cta-button:focus-visible,
.footer__phone:focus-visible,
.faq-item summary:focus-visible { outline: 3px solid var(--yellow); outline-offset: 4px; }
.download-card img { width: 180px; height: auto; max-width: none; flex: 0 0 180px; }
.download-card strong { margin-top: 5px; font-size: 14px; }
.download-card span { color: #5a6b83; font-size: 14px; }
.receive__subtitle {
  margin: -5px auto 22px;
  color: #445875;
  font-size: 15px;
  text-align: center;
}
.receive-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  overflow: hidden;
  margin: 0;
  padding: 0;
  border: 2px solid var(--line);
  border-radius: 18px 18px 0 0;
  background: linear-gradient(180deg, #fff, #f5fbff);
  list-style: none;
}
.receive-card {
  display: flex;
  align-items: center;
  padding: 25px 20px 22px;
  text-align: center;
  flex-direction: column;
}
.receive-card + .receive-card { border-left: 1px dashed #9dcdf0; }
.receive-card__heading { display: flex; min-height: 48px; align-items: center; gap: 10px; }
.receive-card__heading span {
  display: grid;
  width: 36px;
  height: 36px;
  flex: 0 0 36px;
  place-items: center;
  border-radius: 50%;
  background: var(--pink);
  color: #fff;
  font-family: Arial, sans-serif;
  font-weight: 900;
}
.receive-card h3 { margin: 0; color: #0b225b; font-size: 16px; }
.receive-card__phone-image {
  width: auto;
  height: 280px;
  max-width: 100%;
  margin: 18px 0;
  object-fit: contain;
}
.receive-card > p { margin: 0; color: #51627a; font-size: 14px; }
.receive__note {
  display: flex;
  padding: 16px 24px;
  border: 2px solid var(--line);
  border-top: 0;
  border-radius: 0 0 18px 18px;
  background: #edf8ff;
  text-align: center;
  flex-direction: column;
}
.receive__note strong { color: var(--navy); }
.receive__note span { font-size: 14px; }
.shop-cta {
  position: relative;
  overflow: hidden;
  margin-top: 36px;
  background: linear-gradient(100deg, #e90068, #ed2979);
  color: #fff;
}
.shop-cta__inner {
  position: relative;
  display: grid;
  min-height: 210px;
  grid-template-columns: 1fr auto;
  align-items: start;
  gap: 30px;
  padding-top: 30px;
}
.shop-cta__copy { display: flex; position: relative; z-index: 2; align-items: center; gap: 20px; }
.shop-cta__icon {
  display: grid;
  width: 82px;
  height: 82px;
  flex: 0 0 82px;
  place-items: center;
  border: 4px solid #fff;
  border-radius: 18px;
  color: #fff;
  font-size: 30px;
  font-weight: 900;
}
.shop-cta h2 { margin: 0; font-size: clamp(23px, 3vw, 36px); font-weight: 900; line-height: 1.35; }
.shop-cta p { margin: 4px 0 0; font-size: 16px; }
.cta-button {
  position: relative;
  z-index: 2;
  display: flex;
  min-width: 310px;
  min-height: 64px;
  align-items: center;
  justify-content: center;
  margin-top: 12px;
  padding: 12px 28px;
  border: 2px solid #fff;
  border-radius: 999px;
  background: var(--yellow);
  color: #111;
  font-size: 18px;
  font-weight: 900;
  text-decoration: none;
  box-shadow: 0 10px 22px rgba(111, 0, 44, .25);
  transition: background .2s ease, transform .2s ease;
}
.cta-button:hover { background: #ffd000; transform: translateY(-2px); }
.cta-button span { margin-left: 15px; font-size: 34px; line-height: 1; transition: transform .2s ease; }
.cta-button:hover span { transform: translateX(4px); }
.shop-cta__street {
  position: absolute;
  z-index: 1;
  bottom: -1px;
  left: 0;
  width: min(73%, 860px);
  height: 92px;
  object-fit: contain;
  object-position: left bottom;
}
.faq { padding-bottom: 42px; }
.faq-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px 28px; }
.faq-item { border-bottom: 1px solid #c9dff1; }
.faq-item summary {
  position: relative;
  display: flex;
  min-height: 56px;
  align-items: center;
  padding: 10px 38px 10px 0;
  color: var(--navy);
  font-size: 15px;
  font-weight: 900;
  list-style: none;
  cursor: pointer;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  position: absolute;
  right: 8px;
  color: var(--pink);
  content: "＋";
  font-size: 24px;
}
.faq-item[open] summary::after { content: "−"; }
.qa-badge {
  display: grid;
  width: 28px;
  height: 28px;
  flex: 0 0 28px;
  margin-right: 10px;
  place-items: center;
  border-radius: 50%;
  color: #fff;
  font-family: Arial, sans-serif;
  font-size: 14px;
  font-weight: 900;
}
.qa-badge--q { background: var(--navy); }
.qa-badge--a { background: var(--pink); }
.faq-item__answer { display: flex; padding: 0 0 16px; }
.faq-item__answer p { margin: 1px 0 0; font-size: 14px; font-weight: 500; }
.footer { background: linear-gradient(90deg, #07318d, #0756b8); color: #fff; }
.footer__inner {
  display: flex;
  min-height: 86px;
  align-items: center;
  justify-content: center;
  gap: 22px;
}
.footer p { margin: 0; }
.footer__label { padding-right: 22px; border-right: 1px solid rgba(255,255,255,.65); font-size: 14px; }
.footer__org { font-size: 19px; font-weight: 900; }
.footer__phone { color: #fff; font-family: Arial, sans-serif; font-size: 28px; font-weight: 900; text-decoration: none; }
.footer__hours { font-size: 14px; }

@media (max-width: 900px) {
  .step-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .step-card:nth-child(4) { border-left: 0; border-top: 1px solid #cfe9fa; }
  .step-card:nth-child(5), .step-card:nth-child(6) { border-top: 1px solid #cfe9fa; }
  .panel { grid-template-columns: 1fr; }
  .app-downloads { width: min(100%, 430px); margin-inline: auto; }
  .receive-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .receive-card:nth-child(3) { border-left: 0; }
  .receive-card:nth-child(n+3) { border-top: 1px dashed #9dcdf0; }
  .shop-cta__inner { grid-template-columns: 1fr; padding-bottom: 104px; }
  .cta-button { width: fit-content; margin: 0; }
  .shop-cta__street { width: 100%; }
}

@media (max-width: 767px) {
  .container { width: min(calc(100% - 28px), var(--container)); }
  .hero { padding-top: 14px; }
  .hero__frame { border-radius: 10px; box-shadow: 0 8px 20px rgba(3, 54, 120, .12); }
  .section { padding-top: 28px; }
  .overview__introduction { padding: 23px 17px 20px; }
  .overview__introduction h2 { margin-bottom: 12px; font-size: 22px; line-height: 1.55; }
  .overview__introduction > p { font-size: 14px; }
  .overview__organizer { font-size: 14px; }
  .overview__introduction > .overview__ranking { margin-top: 13px; font-size: 14px; }
  .overview__reward { padding: 19px 15px 20px; }
  .overview__reward p { font-size: 14px; line-height: 1.8; }
  .overview__reward .overview__reward-highlight { font-size: 18px; }
  .overview__desktop-break { display: none; }
  .section-title-row { gap: 10px; margin-bottom: 14px; }
  .section-title-row h2 { font-size: 23px; }
  .challenge-grid { grid-template-columns: 1fr; gap: 12px; }
  .challenge-card { min-height: auto; }
  .challenge-card__content { width: 100%; padding: 22px 10px 18px 20px; }
  .challenge-card__target strong { font-size: 42px; }
  .challenge-card__download { margin-top: 15px; }
  .challenge-card__download > p { font-size: 14px; }
  .challenge-card__download > a { padding: 8px 9px; font-size: 14px; }
  .challenge-card__person { right: -6%; width: 43%; }
  .challenge-card--walk .challenge-card__content { width: 100%; margin-left: auto; padding-right: 8px; padding-left: 4px; }
  .challenge-card__person--walk { right: auto; left: 1%; width: 32%; }
  .challenge-card__person--run { right: 1%; width: 34%; }
  .event-entry__inner { padding: 17px 13px; }
  .event-entry__inner > p { font-size: 15px; }
  .event-entry__official { font-size: 14px; line-height: 1.6; }
  .step-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .step-card { min-height: 256px; padding: 18px 10px 16px; }
  .step-card:nth-child(odd) { border-left: 0; }
  .step-card:nth-child(n+3) { border-top: 1px solid #cfe9fa; }
  .step-card__icon { width: 72px; height: 72px; }
  .step-card__icon img { width: 60px; height: 60px; }
  .panel { gap: 28px; padding: 26px 20px; }
  .app-downloads { width: min(100%, 250px); grid-template-columns: 1fr; margin: 0 auto; }
  .download-card img { width: 180px; height: auto; flex-basis: 180px; }
  .receive__subtitle { margin: -2px auto 18px; font-size: 14px; }
  .receive-grid { grid-template-columns: 1fr; }
  .receive-card + .receive-card { border-left: 0; border-top: 1px dashed #9dcdf0; }
  .receive-card { padding: 22px 18px; }
  .receive__note { padding: 16px 18px; }
  .shop-cta__inner { gap: 18px; padding-top: 24px; padding-bottom: 94px; }
  .shop-cta__copy { align-items: flex-start; gap: 12px; }
  .shop-cta__icon { width: 54px; height: 54px; flex-basis: 54px; border-width: 3px; border-radius: 12px; font-size: 20px; }
  .shop-cta h2 { font-size: 22px; }
  .shop-cta p { font-size: 14px; }
  .cta-button { min-width: 0; width: 100%; min-height: 58px; font-size: 16px; }
  .shop-cta__street { height: 80px; }
  .faq-grid { grid-template-columns: 1fr; gap: 0; }
  .footer__inner { min-height: 0; padding: 24px 0; gap: 5px; text-align: center; flex-direction: column; }
  .footer__label { padding: 0; border-right: 0; }
  .footer__phone { font-size: 27px; }
}

@media (max-width: 390px) {
  .step-grid { grid-template-columns: 1fr; }
  .step-card { min-height: auto; }
  .step-card + .step-card { border-left: 0; border-top: 1px solid #cfe9fa; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}
.img_center {
  text-align: center;
  margin: 0 auto 16px;
  max-width: 100px;
  width: 100%;
}
.caution {
  color: var(--pink);
}