:root {
  --blue: #112a77;
  --red: #e73d2e;
  --orange: #e66a12;
  --yellow: #ffd037;
  --cream: #fff4c6;
  --text: #27324a;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--text);
  background: #fff;
  font-family: "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, sans-serif;
  line-height: 1.8;
  padding-bottom: 110px;
}

img { display: block; max-width: 100%; }
small { font-size: 1em; }

/* ▼ 赤太文字のスタイル（サイズ・余白統一版） ▼ */
.highlight-text {
  color: #e60000;
  font-size: 18px;
  font-weight: 800;
  line-height: 1.4;
  display: inline-block;
  margin: 13px 0;
}

.hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: 20px 0 34px;
  background: url("../images/bg@2x-100.png") center top / cover no-repeat;
}

.hero::before,
.hero::after {
  display: none;
}

.hero__desktop {
  position: relative;
  z-index: 1;
  width: min(1180px, calc(100% - 48px));
  margin-inline: auto;
}

.mobile-only { display: none; }

.hero__period {
  position: relative;
  width: min(48%, 560px);
  margin: 0 auto -14px;
}

.hero__period img { width: 100%; height: auto; }

.hero__headline {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  align-items: center;
  min-height: 288px;
}

.hero__corner-logo { position: absolute; z-index: 3; top: 20px; left: 0; width: 180px; height: auto; }

.hero__title { width: min(82%, 900px); margin-inline: auto; filter: drop-shadow(0 5px 0 rgba(255,255,255,.75)); }

.hero__gift-banner {
  width: min(72%, 720px);
  margin: 0 auto 12px;
  padding: 10px 20px;
  color: #fff;
  border: 3px solid #fff;
  border-radius: 999px;
  background: #ef7a32;
  box-shadow: 0 4px 0 rgba(177,74,31,.24);
  font-size: 20px;
  font-weight: 800;
  line-height: 1.25;
  text-align: center;
}

.hero__gift-banner strong { font-size: 1.12em; }

.hero__float { position: absolute; z-index: 2; color: #ff7a79; line-height: 1; }
.hero__float--shell { right: -10px; bottom: 7px; color: #f3a954; font-size: 76px; transform: rotate(22deg); }

.hero__events {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-top: 6px;
}

.hero-card {
  position: relative;
  min-height: 304px;
  overflow: hidden;
  border: 7px solid #23368d;
  border-radius: 18px 18px 10px 10px;
  box-shadow: 0 8px 0 rgba(28,44,110,.16);
}

.hero-card--beaver { background: #ef3329; }
.hero-card--rice { background: #ffce17; }
.hero-card--okonomi { background: #ff7418; }

.hero-card__brand {
  position: relative;
  z-index: 3;
  display: flex;
  width: 100%;
  height: 65px;
  align-items: center;
  justify-content: center;
}

.hero-card__brand img {
  width: calc(100% - 28px);
  height: 58px;
  object-fit: contain;
}

.hero-card__brand--rice { gap: 22px; }
.hero-card--rice .hero-card__panasonic-logo { width: auto; height: 18px; flex: 0 0 auto; }
.hero-card--rice .hero-card__rice-label { width: auto; height: 42px; max-width: 52%; }

.hero-card__brand--blue { background: #202b87; }
.hero-card__brand--white { background: #fff; }

.hero-card__okonomi-brand {
  position: relative;
  z-index: 3;
  display: flex;
  height: 65px;
  align-items: center;
  justify-content: center;
  gap: 6px;
  margin: 0;
  color: #fff;
  background: #202b87;
}

.hero-card__okonomi-brand img { width: calc(100% - 28px); height: 58px; object-fit: contain; }

.hero-card__photo {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  height: 230px;
}

.hero-card__photo::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(110deg, rgba(14,32,104,.06), transparent 50%);
}

.hero-card__photo img { width: 100%; height: 100%; object-fit: cover; }
.hero-card--rice .hero-card__photo img { object-position: center 56%; }

.hero-card__title {
  position: absolute;
  z-index: 3;
  top: 72px;
  left: 9px;
  width: 72%;
  max-height: 100px;
  object-fit: contain;
  object-position: left top;
  filter: drop-shadow(0 2px 0 rgba(255,255,255,.75));
}

.hero-card__mascot {
  position: absolute;
  z-index: 4;
  top: 75px;
  right: 12px;
  width: 82px;
}

.hero-card time {
  position: absolute;
  z-index: 5;
  right: 0;
  bottom: 0;
  left: 0;
  display: flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  padding: 4px 12px;
  color: #172c81;
  border-top: 3px solid #253a98;
  background: #fff;
  font-size: clamp(19px, 2.1vw, 30px);
  font-weight: 800;
  line-height: 1.2;
  text-align: center;
  white-space: nowrap;
}

.hero-card time span { margin-left: .35em; font-size: max(12px, .66em); }

.section {
  width: min(1120px, calc(100% - 56px));
  margin-inline: auto;
}

.intro {
  display: grid;
  grid-template-columns: .9fr 1.1fr;
  gap: 28px 54px;
  align-items: center;
  padding-block: 52px 62px;
}

.intro__copy h1 {
  margin: 0 0 20px;
  color: var(--blue);
  font-size: clamp(26px, 2.6vw, 35px);
  line-height: 1.35;
  white-space: nowrap;
}

.intro__copy h1 span { color: #e43d2f; }
.intro__copy p { margin: 0 0 16px; font-weight: 600; }
.intro__copy strong { color: #1687aa; }

.intro__photo {
  position: relative;
  margin: 0;
}

.intro__photo::before {
  content: "";
  position: absolute;
  inset: -18px -14px 18px 14px;
  z-index: -1;
  border-radius: 50% 42% 47% 40%;
  background: #d8f3fb;
}

.intro__photo img {
  width: 100%;
  border-radius: 54% 42% 48% 40% / 38% 52% 44% 55%;
}

.adventures {
  position: relative;
  padding: 56px 0 86px;
  overflow: hidden;
  background: var(--cream) url("../images/bg@2x-100.png") center bottom / cover no-repeat;
}

.adventures__inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 28px;
  width: min(1200px, calc(100% - 72px));
  margin-inline: auto;
}

.adventures h2 {
  grid-column: 1 / -1;
  margin: 0 0 6px;
  text-align: center;
  color: var(--blue);
  font-size: clamp(30px, 4vw, 50px);
  letter-spacing: .04em;
  text-shadow: 0 2px 0 #fff;
}

/* ========================================================
   ▼ 完璧なレイアウト修正（ブラウザ差異をなくす王道設定） ▼
   ======================================================== */

.event {
  display: flex;
  flex-direction: column; /* 1. カードの中身を縦並びに強制 */
  height: 100%; /* 2. 3つのカードの高さを確実に揃える */
  min-width: 0;
  margin: 0;
  padding: 16px;
  border: 1px solid rgba(42,49,73,.1);
  border-radius: 18px;
  background: rgba(255,255,255,.96);
  box-shadow: 0 12px 24px rgba(82,68,34,.12);
}

.event__desktop-banner {
  display: none;
}

.event--red { color: #ef3b2c; border-top: 7px solid #d9402d; }
.event--yellow { color: #17358f; border-top: 7px solid #f3c92f; }
.event--orange { color: #f26318; border-top: 7px solid #e96817; }

.event__mobile-content {
  display: flex;
  flex-direction: column;
  flex: 1 1 auto; /* 3. カード内の余白をすべてこのエリアで使う */
  width: 100%;
  min-width: 0;
  color: var(--text);
}

.event__date {
  align-self: flex-start;
  display: inline-block;
  margin: 0 0 10px;
  padding: 4px 12px;
  color: #fff;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 800;
  line-height: 1.25;
}

.event__company {
  margin-left: .65em;
  padding-left: .65em;
  border-left: 1px solid rgba(255,255,255,.7);
  font-size: .9em;
}

.event h3 {
  min-height: 64px;
  margin: 0 0 14px;
  color: #a64123;
  font-size: clamp(18px, 1.7vw, 23px);
  line-height: 1.4;
}

.event__main-photo {
  width: 100%;
  aspect-ratio: 1.64 / 1;
  border-radius: 10px;
  object-fit: cover;
  box-shadow: inset 0 0 0 1px rgba(20,31,65,.08);
}

.event__mobile-content > p:not(.event__date) {
  margin: 14px 2px 12px;
  font-size: 16px;
  line-height: 1.75;
}

.event__points {
  margin: 0 0 14px;
  padding: 12px 12px 12px 29px;
  border-radius: 9px;
  background: #fffaf0;
  font-size: 16px;
  line-height: 1.65;
}

.event--red .event__date, .event--red .event__button { background: #d9402d; }
.event--orange .event__date, .event--orange .event__button { background: #e96817; }
.event--yellow .event__date, .event--yellow .event__button { background: #f3c92f; color: var(--blue); }

.prize {
  position: relative;
  display: flex;
  flex-direction: column;
  flex: 1 1 auto; /* 4. オレンジ枠に余った空間をすべて使わせて伸ばす */
  margin-bottom: 16px; /* 5. ボタンとは絶対に16pxの距離を保つバリア */
  border: 1px dashed #e88935;
  border-radius: 10px;
  background: #fffdf8;
}

.prize__heading {
  display: flex;
  width: 100%;
  min-height: 48px;
  align-items: center;
  gap: 8px;
  padding: 6px 13px;
  border-bottom: 1px dashed #f0bd81;
  background: #fff4e8;
}

.prize__heading p {
  margin: 0;
  color: #d95b26;
  font-size: 16px;
  font-weight: 900;
  line-height: 1.35;
}

.prize__medal {
  width: 38px;
  height: 38px;
  flex: 0 0 38px;
  object-fit: contain;
  mix-blend-mode: multiply;
  filter: drop-shadow(0 3px 4px rgba(143, 48, 20, .22));
}

.prize__body {
  display: flex;
  flex-direction: column;
  flex: 1 1 auto; /* 6. オレンジ枠の中身も下まで伸ばす */
  min-height: 0;
  gap: 12px;
  padding: 13px;
}

.prize__visual { 
  display: flex; 
  width: 100%; 
  min-width: 0; 
  height: 220px; 
  flex: 0 0 220px; /* 写真が潰れるのを防ぐ */
  align-items: center; 
  justify-content: center; 
}
.prize__visual > img { width: auto; height: 100%; max-width: 100%; max-height: 100%; object-fit: contain; }

.prize__details { 
  display: flex;
  flex-direction: column;
  width: 100%; 
  padding-top: 10px; 
  border-top: 1px dashed #f0bd81; 
  margin-top: 0; 
  margin-bottom: auto; /* 7. ★ここが最大の魔法！伸びてできた空洞をすべて「文字の下」に集める */
}

.prize__details h4 { margin: 0 0 7px; color: var(--blue); font-size: 18px; line-height: 1.2; }
.prize__details h4 + p + h4 { margin-top: 13px; }
.prize__details p { margin: 0; color: #dd5422; font-size: 14px; line-height: 1.55; }
.prize__product { max-height: none !important; }
.event--yellow .prize__heading { border-bottom-color: #efd97e; background: #fff9dd; }
.event--yellow .prize__heading p { color: #244a9c; }
.event--orange .prize__heading { background: #fff0e8; }

.event__button {
  display: block;
  position: relative;
  margin-top: 0; /* バリアはオレンジ枠側で張っているのでゼロでOK */
  padding: 11px 35px 11px 15px; /* 矢印分の余白 */
  color: #fff;
  border-radius: 999px;
  text-align: center;
  text-decoration: none;
  font-size: 16px;
  font-weight: 800;
  box-shadow: 0 4px 8px rgba(0,0,0,.16);
  transition: transform .2s ease, filter .2s ease;
}

.event__button::after {
  content: "›";
  position: absolute;
  top: 50%;
  right: 15px;
  font-size: 26px;
  line-height: 1;
  transform: translateY(-50%);
}

.event__button-deadline { display: block; margin-top: 2px; font-size: 14px; line-height: 1.2; }

.event__button:hover { filter: brightness(1.05); transform: translateY(-2px); }

/* ======================================================== */

.about {
  display: grid;
  grid-template-columns: .8fr 1.2fr;
  gap: 42px;
  align-items: center;
  margin-block: 44px 52px;
  padding: 38px;
  border: 1px solid #e7eef6;
  border-radius: 22px;
  background: linear-gradient(135deg, #fff 0%, #f8fcff 100%);
  box-shadow: 0 12px 30px rgba(51,91,129,.08);
}

.about h2 {
  margin: 0 0 18px;
  color: var(--blue);
  font-size: 30px;
  line-height: 1.45;
}

.about h2 span { color: #e43d2f; font-size: 1.35em; }
.about p { margin: 0 0 13px; font-weight: 600; }
.about__gallery { display: grid; grid-template-columns: 1fr 1fr 1fr; grid-template-rows: 190px 190px; gap: 6px; }
.about__gallery img { width: 100%; height: 100%; object-fit: cover; }
.about__gallery img:first-child { grid-row: 1 / 3; }
.about__gallery img:last-child { grid-column: 2 / 4; }

/* ▼ 開催概要エリア（白線デザイン反映版） ▼ */
.overview { 
  padding-bottom: 0; 
  margin-top: 40px; 
}
.overview h2 { margin: 0 0 20px; color: var(--blue); text-align: center; font-size: 30px; letter-spacing: .35em; }

.overview__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 3px;
  margin: 0;
  border: 2px solid #bfd0e5;
  border-radius: 15px;
  background: #fff;
  overflow: hidden;
  box-shadow: 0 3px 8px rgba(24,55,94,.08);
}

.overview__grid > div { 
  padding: 20px 10px; 
  text-align: center; 
  background: #f7f9fc; 
}
.overview__grid > div + div { border-left: none; } 

.overview__grid dt {
  display: inline-block;
  padding-bottom: 3px;
  color: var(--blue);
  border-bottom: 2px solid #ee7040;
  font-size: 18px;
  font-weight: 800;
  line-height: 1.35;
}
.overview__grid dd { margin: 7px 0 0; color: #222; font-weight: 700; line-height: 1.45; }

.overview__deadline {
  display: grid;
  grid-column: 1 / -1;
  grid-template-columns: calc((100% - 9px) / 4) 1fr;
  gap: 3px;
  padding: 0 !important;
  border-top: none;
  background: transparent !important;
}

.overview__deadline::before {
  content: "";
  background: #f7f9fc;
  grid-column: 1;
  grid-row: 1;
}

.overview__deadline dt { 
  grid-column: 1;
  grid-row: 1;
  place-self: center;
  margin: 20px 0;
}

.overview__deadline dd { 
  grid-column: 2;
  display: flex; 
  justify-content: space-evenly; 
  align-items: stretch; 
  gap: 0; 
  margin: 0; 
  padding: 0; 
  background: transparent;
  border-left: none; 
}

.overview__deadline-item { 
  flex: 1; 
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: #f7f9fc;
  padding: 20px 10px;
}

.overview__deadline-item + .overview__deadline-item {
  border-left: 3px solid #fff;
}

.overview__deadline-content { display: inline-block; text-align: center; }
.overview__deadline-item b { display: block !important; color: var(--blue); font-size: 16px; line-height: 1.45; }
.overview__deadline-item time { display: block !important; margin-top: 4px; color: #d45125; font-size: 16px; font-weight: 800; line-height: 1.45; }

.participation-rules {
  max-height: 180px;
  margin-top: 24px;
  padding: 0 16px;
  overflow-y: auto;
  color: #424b59;
  border-top: 1px solid #dce5ef;
  border-bottom: 1px solid #dce5ef;
  font-size: 16px;
  line-height: 1.7;
  scrollbar-color: #92a5ba transparent;
  scrollbar-width: thin;
}

.participation-rules h3 { margin: 14px 0 7px; color: var(--blue); font-size: 20px; line-height: 1.35; text-align: center; }
.participation-rules h4 { margin: 16px 0 3px; color: var(--blue); font-size: 16px; line-height: 1.55; }
.participation-rules p { margin: 8px 0; font-size: .8rem; line-height: 1.15; }
.participation-rules__membership { color: #d45125; font-weight: 800; }
.participation-rules a { color: #1b61a9; overflow-wrap: anywhere; }
.gift-box__note { margin: 28px 0 0; padding-bottom: 28px; color: #ef4a2d; font-size: 28px; font-weight: 800; line-height: 1.4; text-align: center; }

.apply-links {
  margin-bottom: 76px;
  padding: 30px;
  border: 1px solid #dce8f5;
  border-radius: 20px;
  background: linear-gradient(145deg, #fff, #f5fbff);
  box-shadow: 0 12px 26px rgba(51,91,129,.1);
  text-align: center;
}

.apply-links h2 { margin: 0 0 7px; color: var(--blue); font-size: 28px; }
.apply-links > p { margin: 0 0 20px; color: #536278; font-size: 14px; font-weight: 700; }
.apply-links__grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.apply-links__button {
  display: flex;
  min-height: 92px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 13px 26px 13px 12px;
  color: #fff;
  border-radius: 13px;
  box-shadow: 0 4px 0 rgba(95,55,27,.18);
  font-size: 16px;
  font-weight: 900;
  line-height: 1.35;
  position: relative;
  text-decoration: none;
  transition: transform .2s ease, filter .2s ease;
}

.apply-links__button span { margin-bottom: 4px; font-size: 12px; font-weight: 800; }
.apply-links__button::after { 
  content: "›";
  position: absolute; 
  top: 50%; 
  right: 12px; 
  font-size: 25px; 
  line-height: 1; 
  transform: translateY(-50%); 
}

.apply-links__button:hover { filter: brightness(1.05); transform: translateY(-2px); }
.apply-links__button--beaver { background: #d9402d; }
.apply-links__button--rice { color: var(--blue); background: #f3c92f; }
.apply-links__button--okonomi { background: #e96817; }

.entry-strip {
  position: fixed;
  z-index: 30;
  right: 0;
  bottom: 0;
  left: 0;
  display: flex;
  min-height: 100px;
  align-items: center;
  justify-content: center;
  gap: 32px;
  color: #fff;
  text-align: center;
  background: linear-gradient(90deg, #ff531d, #f33d17);
  font-size: 24px;
  line-height: 1.15;
  box-shadow: 0 -5px 18px rgba(108,45,20,.18);
}

.entry-strip__icon { font-size: 56px; }
.entry-strip__button {
  min-width: min(520px, 62vw);
  padding: 16px 42px;
  color: #ef4a1e;
  border: 4px solid #fff;
  border-radius: 999px;
  background: #fff;
  box-shadow: 0 4px 0 rgba(151,45,21,.24);
  font-size: clamp(20px, 2.2vw, 28px);
  font-weight: 800;
  line-height: 1.2;
  text-decoration: none;
  transition: transform .2s ease, box-shadow .2s ease;
}

.entry-strip__button:hover {
  box-shadow: 0 2px 0 rgba(151,45,21,.24);
  transform: translateY(2px);
}

.footer {
  min-height: 210px;
  padding: 66px 7% 28px;
  color: #a1a6af;
  background: #f7f8fa;
  font-size: 10px;
  text-align: center;
}

.footer__company { margin-bottom: 16px; line-height: 1.7; }
.footer__company p { margin: 2px 0; }
.footer__company p:first-child { margin-bottom: 7px; font-size: 12px; font-weight: 800; }
.footer__company a { color: #6f7b8a; }

/* ▼ スマホ用レイアウト ▼ */
@media (max-width: 720px) {
  body { padding-bottom: 84px; font-size: 16px; line-height: 1.75; background: #edf1f7; }
  .desktop-only { display: none; }
  .mobile-only { display: block; }
  
  .hero, main, .footer { width: min(100%, 430px); margin-inline: auto; background-color: #fff; }
  .hero { padding: 7px 0 11px; background: url("../images/bg@2x-100.png") center top / cover no-repeat; }
  .hero::before, .hero::after { display: none; }
  .hero__desktop { display: block; width: calc(100% - 12px); }
  .hero__float { display: none; }
  .hero__corner-logo { top: 5px; left: 5px; width: 80px; }
  .hero__period { width: 66%; margin: 0 auto -7px; }
  .hero__headline { grid-template-columns: 1fr; min-height: 130px; }
  .hero__title { width: 90%; filter: drop-shadow(0 2px 0 rgba(255,255,255,.75)); }
  .hero__gift-banner { width: calc(100% - 46px); margin: 0 auto 10px; padding: 7px 12px; border-width: 2px; font-size: 15px; }
  .hero__events { gap: 3px; margin-top: 5px; }
  
  .hero-card { min-height: 168px; border-width: 3px; border-radius: 8px 8px 5px 5px; box-shadow: 0 3px 0 rgba(28,44,110,.16); }
  .hero-card__brand, .hero-card__okonomi-brand { height: 34px; }
  .hero-card__brand img, .hero-card__okonomi-brand img { width: calc(100% - 8px); height: 30px; }
  .hero-card__brand--rice { gap: 7px; }
  .hero-card--rice .hero-card__panasonic-logo { width: auto; height: 6px; flex: 0 0 auto; }
  .hero-card--rice .hero-card__rice-label { width: auto; height: 14px; max-width: none; }
  .hero-card__photo { height: 134px; }
  .hero-card__title { top: 39px; left: 4px; width: 72%; max-height: 54px; filter: drop-shadow(0 1px 0 rgba(255,255,255,.75)); }
  .hero-card__mascot { top: 40px; right: 3px; width: 36px; }
  .hero-card time { right: 0; bottom: 0; left: 0; min-height: 34px; padding: 2px 3px; border-width: 1px; font-size: 12px; letter-spacing: -.04em; line-height: 1.2; text-align: center; white-space: normal; }
  .hero-card time span { display: block; margin-left: 0; font-size: 12px; }

  .section { width: calc(100% - 30px); }
  .intro { display: block; padding-block: 22px 28px; }
  .intro__copy h1 { margin-bottom: 18px; text-align: center; font-size: 19px; white-space: normal; }
  .intro__copy p { margin-bottom: 10px; font-size: 16px; font-weight: 500; }
  .intro__photo { margin-top: 16px; }
  .intro__photo::before { display: block; inset: -11px -8px 12px 8px; }
  .intro__photo img { border-radius: 54% 42% 48% 40% / 38% 52% 44% 55%; }
  
  .adventures { width: min(100%, 430px); margin-inline: auto; padding: 18px 0 38px; background: var(--cream) url("../images/bg@2x-100.png") center bottom / cover no-repeat; }
  .adventures h2 { display: block; margin: 0 0 16px; font-size: 24px; letter-spacing: .02em; }
  .adventures__inner { display: block; width: calc(100% - 24px); }
  
  .event { height: auto; margin-top: 0; margin-bottom: 16px; padding: 10px; border: 1px solid #eadfd6; border-radius: 7px; box-shadow: 0 3px 10px rgba(47,38,22,.08); }
  .event__desktop-banner { display: none; }
  .event__mobile-content { display: block; color: var(--text); }
  .event__date { display: inline-block; margin: 0 0 7px; padding: 2px 10px; color: #fff; border-radius: 999px; font-size: 12px; font-weight: 800; }
  .event h3 { margin: 0 0 11px; color: #b94623; font-size: 17px; line-height: 1.35; }
  .event__main-photo { width: 100%; aspect-ratio: 1.84 / 1; border-radius: 4px; object-fit: cover; }
  .event__mobile-content > p:not(.event__date) { margin: 10px 2px; font-size: 16px; }
  .event__points { margin: 10px 0; padding: 10px 10px 10px 27px; border-radius: 4px; background: #fffaf0; font-size: 16px; }

  .event--red .event__date, .event--red .event__button { background: #d9402d; }
  .event--yellow .event__date, .event--yellow .event__button { background: #f3c92f; }
  .event--orange .event__date, .event--orange .event__button { background: #e96817; }

  /* スマホ版の調整 */
  .prize { display: flex; flex-direction: column; min-height: 0; height: auto; padding: 0; border-radius: 5px; margin-top: 12px; margin-bottom: 0; }
  .prize__heading { min-height: 42px; gap: 6px; padding: 5px 9px; }
  .prize__heading p { font-size: 16px; }
  .prize__medal { width: 31px; height: 31px; flex-basis: 31px; }
  .prize__body { min-height: 0; gap: 10px; padding: 10px 9px; }
  .prize__visual { height: 200px; flex: 0 0 200px; }
  .prize__visual > img { max-height: 100%; }
  .prize__details { padding-top: 9px; margin-bottom: 0; } /* 空白集めの魔法をスマホではリセット */
  .prize__details h4 { margin-bottom: 4px; font-size: 16px; }
  .prize__details h4 + p + h4 { margin-top: 10px; }
  .prize__details p { font-size: 14px; line-height: 1.45; }
  .prize__product { max-height: none !important; }
  
  /* スマホ版の赤太文字サイズ */
  .highlight-text { font-size: 16px; }

  .event__button { display: block; margin-top: 12px; padding: 8px 30px 8px 15px; color: #fff; border-radius: 999px; text-align: center; text-decoration: none; font-size: 16px; font-weight: 800; box-shadow: 0 2px 4px rgba(0,0,0,.18); }
  .event__button::after { right: 12px; font-size: 22px; }

  .about {
    display: block;
    width: calc(100% - 30px);
    margin: 0 auto 22px;
    padding: 22px 16px 16px;
    border: 1px solid #e4edf5;
    border-radius: 12px;
    background: linear-gradient(145deg, #fff, #f9fcff);
    box-shadow: 0 7px 18px rgba(51,91,129,.08);
  }

  .about h2 { margin-bottom: 14px; font-size: 21px; text-align: center; }
  .about h2 span { font-size: 1.2em; }
  .about p { margin-bottom: 9px; font-size: 16px; font-weight: 500; line-height: 1.75; }
  .about__gallery { grid-template-rows: 104px 104px; gap: 4px; margin-top: 14px; }
  
  /* スマホ版の開催概要エリア（白線デザイン反映・1列グリッド） */
  .overview { padding: 15px 0 0; background: #fff; margin-top: 10px; }
  .overview h2 { margin-bottom: 12px; font-size: 20px; letter-spacing: .2em; }
  
  .overview__grid { 
    grid-template-columns: 1fr 1fr; 
    border: 0; 
    border-radius: 0; 
    box-shadow: none; 
    gap: 3px; 
    background: #fff; 
  }
  .overview__grid > div { min-height: 78px; padding: 10px 5px; background: #f7f9fc; }
  .overview__grid > div + div { border-left: 0; }
  .overview__grid > div:last-child { grid-column: 1 / -1; }
  .overview__grid dt { padding-bottom: 2px; font-size: 17px; }
  .overview__grid dd { font-size: 16px; }

  .overview__deadline { 
    grid-template-columns: 1fr; 
    gap: 3px; 
    padding: 0 !important; 
  }
  
  .overview__deadline dt { margin: 13px 0; }
  
  .overview__deadline dd { 
    grid-column: 1;
    grid-row: 2;
    flex-direction: column; 
    gap: 3px; 
    padding: 0; 
  }
  
  .overview__deadline-item { padding: 16px 10px; width: 100%; }
  .overview__deadline-item + .overview__deadline-item { border-left: none; }

  .participation-rules { max-height: 176px; margin-top: 16px; padding: 0 10px; font-size: 16px; line-height: 1.65; }
  .participation-rules h3 { margin-top: 11px; font-size: 18px; }
  .participation-rules h4 { margin-top: 14px; font-size: 16px; }
  .participation-rules p { margin: 7px 0; }

  .gift-box__note { margin: 18px 0 0; padding-bottom: 18px; color: #ef4a2d; font-size: 20px; font-weight: 800; line-height: 1.4; text-align: center; }

  .apply-links { width: calc(100% - 30px); margin: 0 auto 28px; padding: 18px 12px; border-radius: 10px; }
  .apply-links h2 { margin-bottom: 4px; font-size: 20px; }
  .apply-links > p { margin-bottom: 13px; font-size: 16px; }
  .apply-links__grid { display: block; }
  .apply-links__button { min-height: 62px; margin-top: 8px; padding: 8px 24px 8px 8px; border-radius: 8px; font-size: 14px; }
  .apply-links__button:first-child { margin-top: 0; }
  .apply-links__button span { margin-bottom: 1px; font-size: 12px; }
  .apply-links__button::after { right: 10px; font-size: 22px; }

  .entry-strip {
    left: 50%;
    width: min(100%, 430px);
    min-height: 78px;
    gap: 0;
    padding: 7px 10px;
    transform: translateX(-50%);
  }

  .entry-strip__icon { display: block; flex: 0 0 29px; font-size: 27px; }
  .entry-strip__button { flex: 1; width: auto; min-width: 0; padding: 10px 8px; border-width: 2px; font-size: 13px; }
  .footer { min-height: 60px; padding: 18px 15px 24px; font-size: 10px; }
}