/* リセットCSS */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* カラーパレット */
:root {
  --primary-blue: #3396ce;
  --light-blue: #84c4d5;
  --light-green: #f5f8f6;
  --white: #ffffff;
  --dark-text: #333333;
  --gray-text: #666666;
}

/* ベースフォント */
body {
  font-family: "Noto Sans JP", sans-serif;
  color: var(--dark-text);
  line-height: 1.6;
  background-color: var(--light-green);
}

/* コンテナ */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ヘッダー */
.header {
  background-color: var(--white);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 70px;
}

.logo {
  font-size: 24px;
  font-weight: 900;
  color: var(--primary-blue);
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 30px;
}

.nav-menu a {
  text-decoration: none;
  color: var(--dark-text);
  font-weight: 500;
  transition: color 0.3s ease;
}

.nav-menu a:hover {
  color: var(--primary-blue);
}

.hamburger {
  display: none;
  flex-direction: column;
  cursor: pointer;
}

.hamburger span {
  width: 25px;
  height: 3px;
  background-color: var(--dark-text);
  margin: 3px 0;
  transition: 0.3s;
}

/* メインビジュアル */
.hero {
  height: 100vh;
  background: var(--primary-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  color: var(--white);
  text-align: center;
}

.hero-content {
  z-index: 2;
}

.hero-content img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 0 auto;
}

.hero-logo {
  margin-bottom: 40px;
}

.logo-circle {
  width: 300px;
  height: 300px;
  border: 5px solid var(--white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto;
  background-color: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
}

.logo-text h1 {
  font-size: 36px;
  font-weight: 900;
  line-height: 1.2;
}

.hero-info {
  font-size: 18px;
}

.hero-date {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 10px;
}

.hero-location {
  font-size: 20px;
  margin-bottom: 20px;
}

.hero-mission {
  font-size: 22px;
  font-weight: 700;
  background-color: rgba(255, 255, 255, 0.2);
  padding: 20px;
  border-radius: 10px;
  margin-top: 20px;
}

.hero-decoration {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 1;
}

/* セクション共通 */
section {
  padding: 80px 0;
}

.section-title {
  font-size: 36px;
  font-weight: 900;
  color: var(--primary-blue);
  text-align: center;
  margin-bottom: 50px;
  position: relative;
}

.section-title::after {
  content: "";
  width: 60px;
  height: 4px;
  background-color: var(--light-blue);
  position: absolute;
  bottom: -10px;
  left: 50%;
  transform: translateX(-50%);
}

/* 概要セクション */
.overview {
  background-color: var(--white);
}

.overview-content {
  max-width: 900px;
  margin: 0 auto;
}

.mission-box {
  background: linear-gradient(135deg, var(--primary-blue), var(--light-blue));
  color: var(--white);
  padding: 40px;
  border-radius: 20px;
  text-align: center;
  margin-bottom: 40px;
}

.mission-box h3 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 20px;
}

.mission-text {
  font-size: 20px;
  font-weight: 700;
}

.description {
  text-align: center;
  font-size: 18px;
  color: var(--gray-text);
}

/* 参加方法セクション */
.participation {
  background-color: var(--light-green);
}

.info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
}

.info-item {
  background-color: var(--white);
  padding: 30px;
  border-radius: 15px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.info-item h3 {
  font-size: 20px;
  font-weight: 700;
  color: var(--primary-blue);
  margin-bottom: 15px;
}

.status-notice {
  background-color: #ff6b6b;
  color: var(--white);
  padding: 10px;
  border-radius: 5px;
  text-align: center;
  margin-top: 15px;
}

.qr-placeholder {
  margin-top: 20px;
  text-align: center;
}

.qr-code {
  width: 120px;
  height: 120px;
  background-color: var(--light-green);
  border: 2px dashed var(--light-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto;
  border-radius: 10px;
  color: var(--gray-text);
}

/* スケジュールセクション */
.schedule {
  background-color: var(--white);
}

.schedule-list {
  max-width: 700px;
  margin: 0 auto;
}

.schedule-item {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  align-items: center;
  padding: 20px;
  margin-bottom: 15px;
  background-color: var(--light-green);
  border-radius: 10px;
  border-left: 5px solid var(--light-blue);
}

.schedule-date {
  font-weight: 700;
}

.schedule-event {
  font-weight: 700;
  text-align: right;
}

/* ルールセクション */
.rules {
  background-color: var(--light-green);
  text-align: center;
}

.rules-content p {
  font-size: 18px;
  margin-bottom: 30px;
  color: var(--gray-text);
}

.rules-button {
  display: inline-block;
  background: linear-gradient(135deg, var(--primary-blue), var(--light-blue));
  color: var(--white);
  padding: 15px 40px;
  border-radius: 30px;
  text-decoration: none;
  font-weight: 700;
  font-size: 18px;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.rules-button:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 20px rgba(51, 150, 206, 0.3);
}

/* スポンサーセクション */
.sponsor {
  background-color: var(--white);
}

.sponsor-content {
  max-width: 900px;
  margin: 0 auto;
}

.sponsor-intro {
  font-size: 18px;
  text-align: center;
  margin-bottom: 50px;
  color: var(--gray-text);
}

.sponsor-info {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 40px;
  margin-bottom: 50px;
}

.sponsor-fee {
  background-color: var(--light-green);
  padding: 30px;
  border-radius: 15px;
  text-align: center;
}

.sponsor-fee h3 {
  font-size: 20px;
  font-weight: 700;
  color: var(--primary-blue);
  margin-bottom: 20px;
}

.fee {
  font-size: 28px;
  font-weight: 900;
  color: var(--primary-blue);
}

.sponsor-benefits {
  background-color: var(--light-green);
  padding: 30px;
  border-radius: 15px;
}

.sponsor-benefits h3 {
  font-size: 20px;
  font-weight: 700;
  color: var(--primary-blue);
  margin-bottom: 20px;
}

.sponsor-benefits ul {
  list-style: none;
  margin-bottom: 20px;
}

.sponsor-benefits li {
  padding: 8px 0;
  padding-left: 20px;
  position: relative;
}

.sponsor-benefits li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--primary-blue);
  font-weight: 700;
}

.sponsor-notes p {
  font-size: 14px;
  color: var(--gray-text);
  margin-bottom: 5px;
}

.sponsor-application {
  background-color: var(--light-green);
  padding: 30px;
  border-radius: 15px;
}

.sponsor-application h3 {
  font-size: 20px;
  font-weight: 700;
  color: var(--primary-blue);
  margin-bottom: 20px;
}

.deadline {
  margin-top: 20px;
  padding: 15px;
  background-color: #fff3cd;
  border-left: 4px solid #ffc107;
  border-radius: 5px;
}

.closed {
  text-align: center;
  margin-top: 20px;
  padding: 15px;
  background-color: #ff6b6b;
  color: var(--white);
  border-radius: 5px;
}

/* 資料セクション */
.resources {
  background-color: var(--light-green);
  text-align: center;
}

.resources-content p {
  font-size: 18px;
  margin-bottom: 40px;
  color: var(--gray-text);
}

.resources-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
  max-width: 1000px;
  margin: 0 auto;
}

.resource-item {
  background-color: var(--white);
  padding: 30px;
  border-radius: 15px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.resource-item:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 25px rgba(51, 150, 206, 0.2);
}

.resource-item h3 {
  font-size: 20px;
  font-weight: 700;
  color: var(--primary-blue);
  margin-bottom: 15px;
}

.resource-item p {
  font-size: 16px;
  color: var(--gray-text);
  margin-bottom: 20px;
  line-height: 1.6;
}

.resource-button {
  display: inline-block;
  background: linear-gradient(135deg, var(--primary-blue), var(--light-blue));
  color: var(--white);
  padding: 12px 25px;
  border-radius: 25px;
  text-decoration: none;
  font-weight: 600;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.resource-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 15px rgba(51, 150, 206, 0.3);
}

/* 協賛企業セクション */
.sponsors {
  background-color: var(--white);
  text-align: center;
}

.sponsors-content {
  max-width: 1000px;
  margin: 0 auto;
}

.sponsors-intro {
  font-size: 18px;
  margin-bottom: 10px;
  color: var(--gray-text);
}

.sponsors-note {
  font-size: 14px;
  color: var(--primary-blue);
  font-weight: 600;
  margin-bottom: 50px;
}

.sponsors-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 30px;
  margin-bottom: 50px;
  padding: 0 20px;
}

.sponsor-logo {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 120px;
}

.sponsor-logo img {
  max-width: 100%;
  max-height: 100%;
}

.logo-placeholder {
  width: 100%;
  height: 100%;
  background-color: var(--light-green);
  border: 2px solid var(--light-blue);
  border-radius: 15px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: var(--primary-blue);
  font-size: 16px;
  text-align: center;
  padding: 20px;
  box-sizing: border-box;
  transition: all 0.3s ease;
}

.sponsor-logo:not(.coming-soon) .logo-placeholder {
  background: linear-gradient(135deg, var(--light-green), var(--white));
  cursor: pointer;
}

.sponsor-logo:not(.coming-soon) .logo-placeholder:hover {
  background: linear-gradient(135deg, var(--light-blue), var(--primary-blue));
  color: var(--white);
  border-color: var(--primary-blue);
}

.sponsor-logo.coming-soon .logo-placeholder {
  background-color: #f8f9fa;
  border: 2px dashed #dee2e6;
  color: #adb5bd;
  font-style: italic;
}

.sponsor-recruitment {
  background-color: var(--light-green);
  padding: 30px;
  border-radius: 15px;
  margin-top: 40px;
}

.sponsor-recruitment p {
  font-size: 18px;
  font-weight: 600;
  color: var(--primary-blue);
  margin-bottom: 20px;
}

.sponsor-link-button {
  display: inline-block;
  background: linear-gradient(135deg, var(--primary-blue), var(--light-blue));
  color: var(--white);
  padding: 12px 25px;
  border-radius: 25px;
  text-decoration: none;
  font-weight: 600;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.sponsor-link-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 15px rgba(51, 150, 206, 0.3);
}

/* お問い合わせセクション */
.contact {
  background-color: var(--white);
  text-align: center;
}

.contact-info {
  font-size: 18px;
}

.phone {
  margin-top: 20px;
}

/* フッター */
.footer {
  background-color: var(--dark-text);
  color: var(--white);
  padding: 40px 0;
}

.footer-content {
  text-align: center;
}

.organizers {
  margin-bottom: 20px;
}

.organizers p {
  margin-bottom: 10px;
}

.copyright {
  border-top: 1px solid #555;
  padding-top: 20px;
  color: #ccc;
}

/* レスポンシブデザイン */
@media (max-width: 768px) {
  .nav-menu {
    display: none;
  }

  .hamburger {
    display: none;
  }

  .logo-circle {
    width: 250px;
    height: 250px;
  }

  .logo-text h1 {
    font-size: 28px;
  }

  .hero-date {
    font-size: 20px;
  }

  .hero-location {
    font-size: 18px;
  }

  .hero-mission {
    font-size: 18px;
  }

  .section-title {
    font-size: 28px;
  }

  section {
    padding: 60px 0;
  }

  .info-grid {
    grid-template-columns: 1fr;
  }

  .schedule-item {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .schedule-event {
    text-align: center;
  }

  .sponsor-info {
    grid-template-columns: 1fr;
  }

  .resources-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 15px;
  }

  .logo-circle {
    width: 200px;
    height: 200px;
  }

  .logo-text h1 {
    font-size: 24px;
  }

  .hero-mission {
    font-size: 16px;
    padding: 15px;
  }

  .mission-box {
    padding: 25px;
  }

  .info-item {
    padding: 20px;
  }

  .schedule-item {
    padding: 15px;
  }

  .sponsor-fee,
  .sponsor-benefits,
  .sponsor-application {
    padding: 20px;
  }

  .sponsors-grid {
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 20px;
    padding: 0 10px;
  }

  .sponsor-logo {
    height: 100px;
  }

  .logo-placeholder {
    font-size: 14px;
    padding: 15px;
  }

  .sponsor-recruitment {
    padding: 20px;
    margin-top: 30px;
  }

  .resource-item {
    padding: 20px;
  }
}