@charset "UTF-8";

/* ==========================================================================
   Reset & Base Styles
   ========================================================================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden; /* スクロールなし */
}

body {
  /* 欧文: DIN 2014 > Dosis(Google Fonts)
     和文: Noto Sans JP(Google Fonts) > サンセリフ標準 */
  font-family: "DIN 2014", "Dosis", "Noto Sans JP", sans-serif;
  color: #ffffff;
  background-color: #000000;
  -webkit-font-smoothing: antialiased;
}

/* ==========================================================================
   Background Video
   ========================================================================== */
.video-bg {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  height: 100dvh; /* スマホのアドレスバー考慮 */
  z-index: -1;
  overflow: hidden;
}

.video-bg video {
  width: 100%;
  height: 100%;
  object-fit: cover; /* 全画面いっぱいにリサイズカバー */
  object-position: center;
}

.video-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  /* 上部（透明度30%）から下部（透明度70%）にかけて黒のグラデーション */
  background: linear-gradient(
    to bottom,
    rgba(0, 0, 0, 0.9) 0%,
    rgba(0, 0, 0, 0.6) 50%,
    rgba(0, 0, 0, 0.3) 100%
  );
}

/* ==========================================================================
   Layout Wrapper
   ========================================================================== */
.wrapper {
  display: flex;
  flex-direction: column;
  width: 100%;
  height: 100vh;
  height: 100dvh;
  padding: 20px 30px;
}

/* Header */
.header {
  flex-shrink: 0;
}

.site-logo img {
  height: 36px;
  width: auto;
  display: block;
}

/* Main Content (画面中央寄せ) */
.main-content {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.container {
  width: 100%;
  max-width: 800px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
}

/* ==========================================================================
   Components
   ========================================================================== */

/* Hero Title */
.hero-title {
  font-size: clamp(2.5rem, 6vw, 4.2rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: 0.02em;
}

.hero-subtitle {
  font-size: clamp(1.2rem, 3vw, 2rem);
  font-weight: 400;
  opacity: 0.9;
  margin-top: 4px;
}

/* Date */
.hero-date {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 15px;
  font-size: clamp(1.4rem, 3.5vw, 2.2rem);
  font-weight: 700;
}

.hero-date .divider {
  width: 1px;
  height: 24px;
  background-color: rgba(255, 255, 255, 0.4);
}

.hero-date small {
  font-size: 0.6em;
  font-weight: 400;
}

/* Location Badge */
.hero-location {
  display: inline-flex;
  align-items: center;
  background: rgba(22, 60, 138, 0.85); /* 青のカプセル背景 */
  padding: 6px 20px;
  border-radius: 50px;
  font-size: 0.95rem;
  backdrop-filter: blur(4px);
}

.hero-location .badge {
  font-weight: 700;
  margin-right: 12px;
  text-transform: lowercase;
}

.hero-location .location-text {
  font-family: "Yu Gothic Medium", "游ゴシック Medium", YuGothic, sans-serif;
  font-size: 0.9rem;
}

/* Sponsor Area */
.sponsor-section {
  width: 100%;
  margin-top: 5px;
}

.section-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 8px;
  opacity: 0.8;
}

.sponsor-list {
  display: flex;
  justify-content: center;
  gap: 12px;
  list-style: none;
  flex-wrap: wrap;
}

.sponsor-item {
  width: 110px;
  height: 36px;
  background-color: rgba(255, 255, 255, 0.25);
  border-radius: 2px;
}

/* Links Area */
.links-section {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
  margin-top: 5px;
}

.backnumber {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.btn-blue {
  display: inline-block;
  background: #1e4596;
  color: #ffffff;
  text-decoration: none;
  padding: 8px 30px;
  border-radius: 50px;
  font-size: 0.95rem;
  font-weight: 700;
  transition: background-color 0.2s ease;
}

.btn-blue:hover {
  background: #2856b6;
}

.text-link {
  color: #ffffff;
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  border-bottom: 1px solid rgba(255, 255, 255, 0.4);
  padding-bottom: 2px;
}

.text-link .arrow {
  font-size: 0.7em;
  margin-left: 4px;
}

/* Countdown Timer */
.hero-countdown {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  /*background: rgba(0, 0, 0, 0.4);*/
  padding: 10px 24px;
  border-radius: 8px;
  /*border: 1px solid rgba(255, 255, 255, 0.15);*/
  backdrop-filter: blur(4px);
}

.countdown-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 44px;
}

.countdown-item .number {
  font-size: 1.6rem;
  font-weight: 700;
  line-height: 1;
  font-variant-numeric: tabular-nums; /* 数字の横幅を固定してガタつきを防止 */
}

.countdown-item .unit {
  font-size: 0.6rem;
  font-weight: 400;
  opacity: 0.7;
  margin-top: 4px;
  letter-spacing: 0.05em;
}

.hero-countdown .colon {
  font-size: 1.2rem;
  font-weight: 700;
  opacity: 0.6;
  margin-top: -6px; /* 数字の中心高さに合わせる調整 */
}

/* ==========================================================================
   Responsive (SP / Mobile)
   ========================================================================== */
@media (max-width: 768px) {
  .wrapper {
    padding: 15px 20px;
  }

  .container {
    gap: 14px;
  }

  .site-logo img {
    height: 28px;
  }

  .hero-date {
    gap: 10px;
  }

  .sponsor-item {
    width: 60px; /* スマホ時に要素をコンパクトに */
    height: 26px;
  }

  .hero-location {
    padding: 5px 14px;
    font-size: 0.8rem;
  }
}