/* グローバルスタイル */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Noto Sans JP', sans-serif;
}

body {
  background-color: #16161a;
  color: #94a1b2;
  line-height: 1.6;
  overflow-x: hidden;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

h1, h2, h3, h4, h5, h6 {
  color: #fffffe;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 20px;
}

h1 {
  font-size: 3.5rem;
  text-transform: uppercase;
}

h2 {
  font-size: 2.5rem;
  margin-top: 60px;
}

h3 {
  font-size: 1.8rem;
}

p {
  margin-bottom: 20px;
  font-size: 1.1rem;
}

section {
  padding: 80px 0;
}

.btn {
  display: inline-block;
  background-color: #7f5af0;
  color: #fffffe;
  padding: 15px 30px;
  border-radius: 5px;
  text-decoration: none;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  transition: transform 0.3s, box-shadow 0.3s;
  border: none;
  cursor: pointer;
}

.btn:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 20px rgba(127, 90, 240, 0.4);
}

/* ヘッダー */
header {
  padding: 20px 0;
  position: fixed;
  width: 100%;
  top: 0;
  z-index: 1000;
  background-color: rgba(22, 22, 26, 0.9);
  backdrop-filter: blur(10px);
  transition: transform 0.3s ease, background-color 0.3s ease;
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.8rem;
  font-weight: 700;
  color: #fffffe;
  text-decoration: none;
}

.logo span {
  color: #7f5af0;
}

/* バーガーメニュー */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 10px;
  z-index: 1001;
}

.menu-toggle span {
  display: block;
  width: 25px;
  height: 2px;
  background-color: #fffffe;
  margin: 5px 0;
  transition: all 0.3s ease;
}

/* ナビゲーション */
.nav-menu {
  display: flex;
}

.nav-menu ul {
  display: flex;
  list-style: none;
}

.nav-menu ul li {
  margin-left: 30px;
}

.nav-menu ul li a {
  text-decoration: none;
  color: #94a1b2;
  font-weight: 500;
  transition: color 0.3s;
  text-transform: uppercase;
  letter-spacing: 1px;
  font-size: 0.9rem;
}

.nav-menu ul li a:hover {
  color: #7f5af0;
}

/* ヒーローセクション */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  padding-top: 160px;
  background: linear-gradient(rgba(22, 22, 26, 0.7), rgba(22, 22, 26, 0.9)), url('../images/hero-banner.png') center/cover no-repeat;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 800px;
  padding: 40px 0;
}

.hero-date {
  display: inline-block;
  background-color: #7f5af0;
  color: #fffffe;
  padding: 12px 24px;
  border-radius: 30px;
  margin-bottom: 30px;
  font-weight: 600;
  letter-spacing: 1px;
  font-size: 1.1rem;
}

.hero-title {
  font-size: 4rem;
  margin-bottom: 30px;
  line-height: 1.1;
}

.hero-subtitle {
  font-size: 1.5rem;
  margin-bottom: 40px;
  color: #fffffe;
}

/* カウントダウン */
.countdown {
  display: flex;
  margin-top: 40px;
  margin-bottom: 30px;
}

.countdown-item {
  margin-right: 30px;
  text-align: center;
}

.countdown-number {
  font-size: 3rem;
  font-weight: 700;
  color: #fffffe;
  line-height: 1;
}

.countdown-label {
  font-size: 0.9rem;
  text-transform: uppercase;
  margin-top: 5px;
}

/* コンセプトセクション */
.concept {
  position: relative;
  overflow: hidden;
}

.section-title {
  text-align: center;
  margin-bottom: 60px;
}

.section-title h2 {
  display: inline-block;
  padding-bottom: 10px;
  position: relative;
}

.section-title h2::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 80px;
  height: 3px;
  background-color: #7f5af0;
}

.concept-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 40px;
  margin-top: 40px;
}

.concept-item {
  background-color: rgba(255, 255, 255, 0.05);
  border-radius: 15px;
  padding: 40px 30px;
  transition: transform 0.3s, box-shadow 0.3s;
  border: 1px solid rgba(127, 90, 240, 0.1);
  backdrop-filter: blur(10px);
}

.concept-item:hover {
  transform: translateY(-10px);
  box-shadow: 0 15px 30px rgba(127, 90, 240, 0.2);
  border-color: rgba(127, 90, 240, 0.3);
}

.concept-icon {
  width: 48px;
  height: 48px;
  margin-bottom: 20px;
}

/* タイムテーブルセクション */
.timetable {
  background-color: rgba(255, 255, 255, 0.02);
}

.timetable-grid {
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: 20px;
  margin-top: 30px;
}

.timetable-row {
  display: contents;
}

.timetable-time {
  padding: 20px;
  font-weight: 600;
  color: #fffffe;
  border-right: 2px solid #7f5af0;
  position: relative;
}

.timetable-time::after {
  content: '';
  position: absolute;
  top: 50%;
  right: -6px;
  transform: translateY(-50%);
  width: 10px;
  height: 10px;
  background-color: #7f5af0;
  border-radius: 50%;
}

.timetable-event {
  padding: 25px;
  background-color: rgba(255, 255, 255, 0.05);
  border-radius: 10px;
  margin-bottom: 15px;
  border: 1px solid rgba(127, 90, 240, 0.1);
  backdrop-filter: blur(10px);
  transition: transform 0.3s, box-shadow 0.3s;
}

.timetable-event:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 20px rgba(127, 90, 240, 0.2);
  border-color: rgba(127, 90, 240, 0.3);
}

.timetable-event h4 {
  margin-bottom: 10px;
  color: #fffffe;
}

/* セッションセクション */
.sessions {
  padding-bottom: 120px;
}

.tab-buttons {
  display: flex;
  justify-content: center;
  margin-bottom: 40px;
}

.tab-button {
  background-color: transparent;
  border: none;
  color: #94a1b2;
  font-size: 1.2rem;
  font-weight: 600;
  padding: 15px 30px;
  cursor: pointer;
  transition: color 0.3s;
  position: relative;
}

.tab-button.active {
  color: #fffffe;
}

.tab-button.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 50px;
  height: 3px;
  background-color: #7f5af0;
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

.session-card {
  background-color: rgba(255, 255, 255, 0.05);
  border-radius: 15px;
  padding: 35px;
  margin-bottom: 30px;
  transition: transform 0.3s, box-shadow 0.3s;
  border: 1px solid rgba(127, 90, 240, 0.1);
  backdrop-filter: blur(10px);
}

.session-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 15px 30px rgba(127, 90, 240, 0.2);
  border-color: rgba(127, 90, 240, 0.3);
}

.session-time {
  display: inline-block;
  background-color: #7f5af0;
  color: #fffffe;
  padding: 5px 15px;
  border-radius: 20px;
  font-size: 0.9rem;
  margin-bottom: 15px;
}

.session-speaker {
  display: flex;
  align-items: center;
  margin-top: 20px;
}

.speaker-image {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  margin-right: 15px;
  object-fit: cover;
}

.speaker-details h5 {
  margin-bottom: 5px;
}

.speaker-company {
  font-size: 0.9rem;
  opacity: 0.8;
}

/* 申し込みセクション */
.register {
  text-align: center;
  padding: 100px 0;
  background: linear-gradient(rgba(22, 22, 26, 0.8), rgba(22, 22, 26, 0.8)), url('../images/hero-banner.png') center/cover fixed no-repeat;
}

.register h2 {
  font-size: 3rem;
  margin-bottom: 30px;
}

.register p {
  max-width: 600px;
  margin: 0 auto 40px;
  font-size: 1.2rem;
}

.register .btn {
  font-size: 1.2rem;
  padding: 20px 40px;
}

/* イベント概要セクション */
.event-info {
  padding: 80px 0;
}

.event-summary {
  background-color: rgba(255, 255, 255, 0.05);
  border-radius: 15px;
  padding: 40px;
  margin-bottom: 40px;
  border: 1px solid rgba(127, 90, 240, 0.1);
  backdrop-filter: blur(10px);
}

.event-summary-content h3 {
  display: flex;
  align-items: center;
  gap: 15px;
  font-size: 1.8rem;
  margin-bottom: 30px;
  color: #fffffe;
}

.info-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: rgba(127, 90, 240, 0.1);
  border-radius: 10px;
}

.event-details-list {
  list-style: none;
  margin-bottom: 30px;
}

.event-details-list li {
  margin-bottom: 20px;
  font-size: 1.1rem;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.9);
}

.event-details-list li strong {
  color: #7f5af0;
  margin-right: 10px;
}

.event-note {
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.6);
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.map-container {
  border-radius: 15px;
  overflow: hidden;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
  border: 1px solid rgba(127, 90, 240, 0.1);
}

.map-container iframe {
  width: 100%;
  height: 450px;
  border: none;
}

/* フッター */
footer {
  background-color: rgba(0, 0, 0, 0.3);
  padding: 60px 0 30px;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
}

.footer-about {
  max-width: 400px;
}

.footer-logo {
  font-size: 2rem;
  font-weight: 700;
  color: #fffffe;
  margin-bottom: 20px;
  display: block;
}

.footer-logo span {
  color: #7f5af0;
}

.social-links {
  display: flex;
  gap: 15px;
  margin-top: 30px;
}

.social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background-color: rgba(255, 255, 255, 0.1);
  border-radius: 50%;
  color: #fffffe;
  text-decoration: none;
  transition: background-color 0.3s;
  position: relative;
}

.social-link img {
  width: 20px;
  height: 20px;
  object-fit: contain;
}

.social-link:hover {
  background-color: #7f5af0;
}

.footer-bottom {
  margin-top: 50px;
  text-align: center;
  font-size: 0.9rem;
  opacity: 0.6;
}

/* レスポンシブデザイン */
@media screen and (max-width: 992px) {
  h1 {
    font-size: 3rem;
  }
  
  .hero-title {
    font-size: 3rem;
  }
  
  .timetable-grid {
    grid-template-columns: 1fr;
  }
  
  .timetable-time {
    border-right: none;
    border-bottom: 2px solid #7f5af0;
    padding: 10px 0;
  }
  
  .timetable-time::after {
    right: auto;
    top: auto;
    left: 0;
    bottom: -6px;
  }
  
  .event-info-wrapper {
    grid-template-columns: 1fr;
    padding: 30px;
  }
  
  .map-container {
    height: 400px;
  }
}

@media screen and (max-width: 768px) {
  header {
    padding: 15px 0;
  }
  
  .header-content {
    flex-direction: column;
  }
  
  .menu-toggle {
    display: block;
  }
  
  .menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }
  
  .menu-toggle.active span:nth-child(2) {
    opacity: 0;
  }
  
  .menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
  }
  
  .nav-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 100%;
    height: 100vh;
    background-color: rgba(22, 22, 26, 0.95);
    backdrop-filter: blur(10px);
    transition: right 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
  }
  
  .nav-menu.active {
    right: 0;
  }
  
  .nav-menu ul {
    flex-direction: column;
    align-items: center;
    gap: 30px;
  }
  
  .nav-menu ul li {
    margin: 0;
  }
  
  .nav-menu ul li a {
    font-size: 1.2rem;
    color: #fffffe;
  }
  
  .hero {
    padding-top: 140px;
    min-height: calc(100vh - 60px);
  }
  
  .hero-content {
    padding: 30px 0;
  }
  
  .hero-date {
    padding: 10px 20px;
    font-size: 1rem;
    margin-bottom: 25px;
  }
  
  .hero-title {
    font-size: 2.5rem;
  }
  
  .hero-subtitle {
    font-size: 1.2rem;
  }
  
  .countdown {
    flex-wrap: wrap;
    justify-content: center;
  }
  
  .countdown-item {
    margin: 10px 20px;
  }
  
  h2 {
    font-size: 2rem;
  }
  
  .footer-content {
    flex-direction: column;
    gap: 40px;
  }
  
  .event-info-wrapper {
    padding: 20px;
  }
  
  .info-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  
  .info-item {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .info-icon-wrapper {
    margin-bottom: 15px;
  }
  
  .event-summary {
    padding: 30px 20px;
  }
  
  .event-details-list li {
    font-size: 1rem;
  }
  
  .map-container iframe {
    height: 350px;
  }
}