* {
  margin: 0;
  padding: 0;
  position: relative;
  scroll-behavior: smooth;
}

ul {
  list-style: none;
}

a {
  text-decoration: none;
  outline: none;
}

picture {
  display: block;
  line-height: 0;
  font-size: 0;
}

picture img {
  display: block;
  width: 100%;
  height: auto;
}

html,
body {
  width: 100%;
  margin: 0;
  padding: 0;
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue",
    Arial, "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Hiragino Sans GB",
    "Yu Gothic", Meiryo, sans-serif;
  background-color: #071045;
}

body {
  position: relative;
  width: 100%;
  height: 100%;
  overflow-x: hidden;
  overflow-y: auto;
}

.header__logo {
  width: 100%;
  height: auto;
  display: flex;
  align-items: center;
  justify-content: center;
  box-sizing: border-box;
  margin: 0;
  padding: 15px 0;
  background-color: #003399;
}

.header__image {
  width: 100%;
  position: relative;
  height: auto;
  display: block;
  margin: 0;
  padding: 0;
  background-color: #1a1008;
  line-height: 0;
}

.header__image-campaign {
  display: block;
  width: 100%;
  height: auto;
  margin: 0 auto;
}

.header__logo-image {
  width: 290px;
  height: auto;
}

@media screen and (max-width: 768px) {
  .header__logo-image {
    width: 200px;
    height: auto;
    display: block;
    margin: 0 auto;
  }
}

.campaign-wrapper {
  background-color: #a93e3e;
  background-image: url("../images/confetti_bg.png");
  background-size: 1920px 1440px;
  background-repeat: repeat;
  background-position: top center;
}

@media screen and (max-width: 768px) {
  .campaign-wrapper {
    background-size: 768px;
    background-position: center;
  }
}

@media screen and (max-width: 480px) {
  .campaign-wrapper {
    background-size: 480px;
    background-position: center;
  }
}

.container {
  width: 100%;
  max-width: 960px;
  margin: 0 auto;
  padding: 50px 0;
  box-sizing: border-box;
}

@media screen and (max-width: 1040px) {
  .container {
    width: 90%;
  }
}

/* リード＋賞品＋応募（1ブロック） */
.campaign-entry {
  background: #fff url("../images/entry_bg.jpg") center / cover no-repeat;
  border-radius: 16px;
  padding: 48px 32px 40px;
  text-align: center;
  box-sizing: border-box;
}

@media screen and (max-width: 768px) {
  .campaign-entry {
    padding: 32px 16px 28px;
    background-image: url("../images/entry_bg_sp.jpg");
    background-position: center top;
  }
}

.campaign-entry__title {
  margin: 0 auto 28px;
  line-height: 1;
}

.campaign-entry__title-image {
  width: 100%;
  max-width: 780px;
  height: auto;
  display: block;
  margin: 0 auto;
}

@media screen and (max-width: 768px) {
  .campaign-entry__title {
    margin-bottom: 20px;
  }
}

.campaign-lead {
  margin-bottom: 28px;
}

.campaign-lead__body {
  font-size: 20px;
  font-weight: bold;
  color: #333;
  line-height: 1.7;
  margin-bottom: 10px;
}

@media screen and (max-width: 480px) {
  .campaign-lead__body {
    font-size: 15px;
  }
}

.campaign-lead__prize {
  font-size: 18px;
  color: #333;
  line-height: 1.7;
}

.campaign-lead__prize strong {
  color: #a2282c;
  font-weight: 800;
  text-decoration: underline;
  text-decoration-color: rgba(162, 40, 44, 0.3);
  text-underline-offset: 3px;
}

@media screen and (max-width: 480px) {
  .campaign-lead__prize {
    font-size: 14px;
  }
}

.campaign-entry__prize {
  max-width: 420px;
  margin: 0 auto 22px;
}

.campaign-entry__prize-image {
  width: 100%;
  height: auto;
  display: block;
}

.campaign-entry__prize-caption {
  font-size: 18px;
  font-weight: 700;
  color: #333;
  line-height: 1.6;
  margin-bottom: 28px;
}

.campaign-entry__prize-caption strong {
  color: #a2282c;
  font-weight: 800;
  /* 蛍光ペン風の淡い黄色ライン */
  background: linear-gradient(
    transparent 52%,
    #fff3a8 52%,
    #fff3a8 94%,
    transparent 94%
  );
  padding: 0 0.1em;
}

@media screen and (max-width: 480px) {
  .campaign-entry__prize-caption {
    font-size: 15px;
  }
}

/* CSS応募ボタン */
.entry-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-width: 320px;
  max-width: 100%;
  padding: 18px 40px;
  background: linear-gradient(180deg, #f5d76e 0%, #e8b923 55%, #d4a017 100%);
  color: #1a1a1a;
  font-size: 20px;
  font-weight: bold;
  letter-spacing: 0.08em;
  border-radius: 999px;
  box-shadow:
    0 4px 0 #b8860b,
    0 8px 16px rgba(0, 0, 0, 0.18);
  transition:
    transform 0.15s ease,
    box-shadow 0.15s ease;
  box-sizing: border-box;
}

.entry-cta::after {
  content: "";
  display: block;
  width: 10px;
  height: 10px;
  border-top: 3px solid #1a1a1a;
  border-right: 3px solid #1a1a1a;
  transform: rotate(45deg);
  margin-left: 4px;
}

.entry-cta:hover {
  transform: translateY(-2px);
  box-shadow:
    0 6px 0 #b8860b,
    0 10px 20px rgba(0, 0, 0, 0.2);
}

.entry-cta:active {
  transform: translateY(2px);
  box-shadow:
    0 2px 0 #b8860b,
    0 4px 8px rgba(0, 0, 0, 0.15);
}

@media screen and (max-width: 768px) {
  .entry-cta {
    min-width: 0;
    width: 100%;
    padding: 16px 24px;
    font-size: 18px;
  }
}

@media screen and (max-width: 480px) {
  .entry-cta {
    gap: 6px;
    padding: 12px 16px;
    font-size: 14px;
    letter-spacing: 0.04em;
  }

  .entry-cta::after {
    width: 8px;
    height: 8px;
    border-top-width: 2px;
    border-right-width: 2px;
    margin-left: 2px;
  }
}

@media screen and (max-width: 375px) {
  .entry-cta {
    padding: 11px 12px;
    font-size: 13px;
    letter-spacing: 0.02em;
  }
}

#scroll-top {
  display: none;
  position: fixed;
  right: 20px;
  bottom: 20px;
  width: 50px;
  height: 50px;
  background-color: #fff;
  border-radius: 10px;
  border: 2px solid #a93e3e;
  cursor: pointer;
  z-index: 1000;
  background-image: url("../images/scroll-icon.png");
  background-size: 30%;
  background-repeat: no-repeat;
  background-position: center;
}

@media screen and (max-width: 768px) {
  #scroll-top {
    width: 25px;
    height: 25px;
    right: 10px;
    bottom: 10px;
    background-size: 25%;
    border-radius: 5px;
  }
}

#scroll-top.show-scroll-icon {
  display: block;
}

.sp-only {
  display: none;
}

@media screen and (max-width: 768px) {
  .sp-only {
    display: block;
  }
}