/* ============================================================
   TOHOKU IGNITE 2027 特設サイト — スタイルシート
   tohoku-ignite.jp のデザイントークン・雰囲気を踏襲
   ============================================================ */

/* ----------------------------------------
   デザイントークン
   ---------------------------------------- */
:root {
  --c-red:         #DC2626;
  --c-red-dark:    #B91C1C;
  --c-red-deep:    #991B1B;
  --c-red-soft:    #FEE2E2;
  --c-orange:      #F97316;
  --c-orange-soft: #FFEDD5;
  --c-yellow:      #FBBF24;
  --c-yellow-soft: #FEF3C7;
  --c-gold:        #F59E0B;

  --c-bg:        #FFFEF7;
  --c-bg-warm:   #FFF7E8;
  --c-bg-cream:  #FFFAF0;
  --c-white:     #FFFFFF;
  --c-text:      #1F1F1F;
  --c-text-soft: #4B4B4B;
  --c-muted:     #9CA3AF;
  --c-line:      #F0E8DC;

  --ff-base:    'Noto Sans JP', -apple-system, BlinkMacSystemFont, sans-serif;
  --ff-display: 'Anton', 'Noto Sans JP', sans-serif;
  --ff-script:  'Caveat', cursive;

  --radius-sm:   8px;
  --radius-md:   14px;
  --radius-lg:   20px;
  --radius-xl:   28px;
  --radius-pill: 999px;

  --shadow-sm:  0 2px 8px rgba(220,38,38,0.06);
  --shadow-md:  0 8px 24px rgba(220,38,38,0.10);
  --shadow-lg:  0 16px 40px rgba(220,38,38,0.15);
  --shadow-cta: 0 10px 30px rgba(220,38,38,0.35);

  --max-w:     1240px;
  --pad-x:     clamp(1.25rem, 4vw, 2.5rem);
  --header-h:  80px;

  --t-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --t-med:  0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ----------------------------------------
   リセット
   ---------------------------------------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--ff-base);
  font-weight: 500;
  color: var(--c-text);
  background: var(--c-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img, svg { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }
:focus-visible { outline: 3px solid var(--c-orange); outline-offset: 3px; border-radius: 4px; }

.skip-link {
  position: absolute; top: -100%; left: 1rem; z-index: 9999;
  background: var(--c-red); color: #fff; padding: 0.5rem 1rem;
  border-radius: var(--radius-sm); font-weight: 700;
}
.skip-link:focus { top: 1rem; }

/* ----------------------------------------
   レイアウト
   ---------------------------------------- */
.container { width: 100%; max-width: var(--max-w); margin-inline: auto; padding-inline: var(--pad-x); }
.section    { padding-block: clamp(3rem, 6vw, 5.5rem); position: relative; }

/* ----------------------------------------
   ヘッダー
   ---------------------------------------- */
.header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 254, 247, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--c-line);
  height: var(--header-h);
  display: flex; align-items: center;
}
.header__inner { display: flex; align-items: center; gap: 1.5rem; height: 100%; }

.logo { display: inline-flex; align-items: center; gap: 0.5rem; flex-shrink: 0; }
.logo__flame { width: 32px; height: 38px; filter: drop-shadow(0 2px 4px rgba(220,38,38,0.2)); }
.logo__text  { display: flex; flex-direction: column; line-height: 0.95; }
.logo__text-1 { font-size: 0.72rem; font-weight: 900; letter-spacing: 0.06em; color: var(--c-text); }
.logo__text-2 { font-size: 1.05rem; font-weight: 900; letter-spacing: 0.04em; color: var(--c-red); }
.logo__text-3 { font-size: 0.62rem; font-weight: 700; letter-spacing: 0.08em; color: var(--c-muted); margin-top: 0.1rem; }

.nav { flex: 1; }
.nav__list { display: flex; align-items: center; justify-content: center; gap: 0.1rem; }
.nav__link {
  position: relative; display: block;
  padding: 0.55rem 0.85rem;
  font-size: 0.88rem; font-weight: 700;
  color: var(--c-text-soft);
  transition: color var(--t-fast); white-space: nowrap;
}
.nav__link:hover { color: var(--c-red); }
.nav__link.is-active { color: var(--c-red); }
.nav__link.is-active::after {
  content: ''; position: absolute;
  bottom: -2px; left: 0.85rem; right: 0.85rem;
  height: 3px; border-radius: 2px; background: var(--c-red);
}

.nav__cta {
  display: inline-flex; align-items: center; gap: 0.35rem;
  background: var(--c-red); color: #fff;
  padding: 0.5rem 1.1rem; border-radius: var(--radius-pill);
  font-size: 0.82rem; font-weight: 800;
  transition: background var(--t-fast), transform var(--t-fast);
  white-space: nowrap;
}
.nav__cta:hover { background: var(--c-red-dark); transform: translateY(-1px); }

.hamburger {
  display: none; width: 44px; height: 44px;
  flex-direction: column; justify-content: center; align-items: center; gap: 5px;
  border-radius: var(--radius-sm); flex-shrink: 0;
}
.hamburger__bar { display: block; width: 22px; height: 2.5px; background: var(--c-text); border-radius: 2px; transition: transform var(--t-fast), opacity var(--t-fast); }
.hamburger.is-active .hamburger__bar:nth-child(1) { transform: translateY(7.5px) rotate(45deg); }
.hamburger.is-active .hamburger__bar:nth-child(2) { opacity: 0; }
.hamburger.is-active .hamburger__bar:nth-child(3) { transform: translateY(-7.5px) rotate(-45deg); }

.mobile-nav {
  position: fixed; top: var(--header-h); right: 0;
  width: min(340px, 88vw); height: calc(100dvh - var(--header-h));
  background: var(--c-white); z-index: 99;
  transform: translateX(100%); transition: transform var(--t-med);
  overflow-y: auto; box-shadow: var(--shadow-lg); padding: 1.5rem;
}
.mobile-nav.is-open { transform: translateX(0); }
.mobile-nav__list { display: flex; flex-direction: column; gap: 0.25rem; }
.mobile-nav__link {
  display: block; padding: 0.9rem 1rem;
  font-size: 1rem; font-weight: 700; color: var(--c-text);
  border-radius: var(--radius-sm); transition: background var(--t-fast), color var(--t-fast);
}
.mobile-nav__link:hover { background: var(--c-bg-warm); color: var(--c-red); }
.mobile-nav__cta {
  display: block; text-align: center; margin-top: 1rem;
  background: var(--c-red); color: #fff; padding: 0.85rem 1rem;
  border-radius: var(--radius-md); font-weight: 800; font-size: 1rem;
}
.mobile-nav-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,0.4);
  z-index: 98; opacity: 0; pointer-events: none; transition: opacity var(--t-med);
}
.mobile-nav-overlay.is-active { opacity: 1; pointer-events: auto; }

/* ============================================================
   ヒーロー（動画背景）
   ============================================================ */
.hero {
  position: relative;
  min-height: clamp(580px, 82vh, 780px);
  display: flex; align-items: center;
  background: #0A0A0A;
  overflow: hidden;
  padding: clamp(4rem, 10vw, 7rem) 0 clamp(3rem, 6vw, 5rem);
}

.hero__video-wrap {
  position: absolute; inset: 0; overflow: hidden; z-index: 0;
  pointer-events: none;
  filter: brightness(0.5) saturate(0.9) contrast(1.05);
}
#vimeo-player {
  position: absolute !important; top: 50% !important; left: 50% !important;
  width: 177.78vh !important; height: 100vh !important;
  min-width: 100% !important; min-height: 100% !important;
  transform: translate(-50%, -50%) !important; pointer-events: none !important;
}
#vimeo-player iframe { width: 100% !important; height: 100% !important; border: 0 !important; pointer-events: none !important; }
@media (min-aspect-ratio: 16/9) {
  #vimeo-player { width: 100vw !important; height: 56.25vw !important; }
}

.hero__cover {
  position: absolute; inset: 0; z-index: 1;
  background: #0A0A0A; pointer-events: none; transition: opacity 0.8s ease;
}
.hero__cover.is-hidden { opacity: 0; }

.hero__overlay {
  position: absolute; inset: 0; z-index: 1; pointer-events: none;
  background:
    linear-gradient(180deg, rgba(0,0,0,0.4) 0%, rgba(0,0,0,0.1) 30%, rgba(0,0,0,0.5) 100%),
    radial-gradient(circle at 25% 40%, rgba(220,38,38,0.2), transparent 55%),
    radial-gradient(circle at 80% 65%, rgba(249,115,22,0.14), transparent 50%);
}

.hero__inner {
  position: relative; z-index: 2; width: 100%;
  max-width: var(--max-w); margin-inline: auto; padding-inline: var(--pad-x);
  display: flex; align-items: flex-end; justify-content: space-between;
  gap: 2rem; flex-wrap: wrap;
}

.hero__content { max-width: 720px; }

.hero__eyebrow {
  display: inline-flex; align-items: center; gap: 0.5rem;
  background: var(--c-yellow); color: var(--c-text);
  padding: 0.3rem 0.85rem; border-radius: var(--radius-pill);
  font-size: 0.78rem; font-weight: 900; letter-spacing: 0.1em;
  margin-bottom: 1.25rem;
}

.hero__title {
  font-family: var(--ff-display);
  font-size: clamp(3.2rem, 10vw, 7rem);
  line-height: 0.9; letter-spacing: -0.01em; margin-bottom: 0.5rem;
}
.hero__title-row { display: block; }
.hero__title .l { display: inline-block; font-family: var(--ff-display); font-weight: 900; }
.hero__title .l-1 { color: #F5C842; } .hero__title .l-2 { color: #F2A93E; }
.hero__title .l-3 { color: #ED7D2F; } .hero__title .l-4 { color: #D9492B; }
.hero__title .l-5 { color: #C8302A; } .hero__title .l-6 { color: #B82428; }
.hero__title .l-7 { color: #E8542F; } .hero__title .l-8 { color: #D43A2C; }
.hero__title .l-9 { color: #B82428; } .hero__title .l-10 { color: #9B1B23; }
.hero__title .l-11 { color: #C8302A; } .hero__title .l-12 { color: #B82428; }
.hero__title .l { text-shadow: 0 2px 12px rgba(0,0,0,0.4), 0 0 40px rgba(220,38,38,0.25); }

.hero__year {
  font-family: var(--ff-display); font-size: clamp(1.6rem, 4vw, 2.8rem);
  color: rgba(255,255,255,0.9); letter-spacing: 0.1em; margin-bottom: 1.25rem;
  text-shadow: 0 2px 12px rgba(0,0,0,0.4);
}

.hero__catchcopy {
  font-size: clamp(1rem, 2.2vw, 1.4rem); font-weight: 700; line-height: 1.6;
  color: #fff; text-shadow: 0 2px 14px rgba(0,0,0,0.55); margin-bottom: 2rem;
}

.hero__actions { display: flex; gap: 1rem; flex-wrap: wrap; }

.hero__badge-dates {
  display: flex; flex-direction: column; align-items: flex-end; gap: 0.5rem;
  padding: 1.25rem 1.5rem;
  background: rgba(255,255,255,0.08); border: 1px solid rgba(255,255,255,0.25);
  border-radius: var(--radius-xl); backdrop-filter: blur(8px); color: #fff;
  flex-shrink: 0; align-self: center;
}
.hero__badge-label {
  font-size: 0.7rem; font-weight: 700; letter-spacing: 0.2em; color: var(--c-yellow);
  font-family: var(--ff-display);
}
.hero__badge-date {
  display: flex; align-items: baseline; gap: 0.6rem;
}
.hero__badge-num { font-family: var(--ff-display); font-size: clamp(1.8rem, 3.5vw, 2.4rem); line-height: 1; }
.hero__badge-day { font-family: var(--ff-display); font-size: 0.75rem; letter-spacing: 0.25em; opacity: 0.8; }
.hero__badge-tag { font-size: 0.65rem; font-weight: 700; letter-spacing: 0.1em; color: var(--c-yellow-soft); opacity: 0.85; text-align: right; }
.hero__badge-divider { width: 100%; height: 1px; background: rgba(255,255,255,0.2); }

.hero__scroll-hint {
  position: absolute; bottom: 1.5rem; left: 50%; transform: translateX(-50%);
  z-index: 3; display: flex; flex-direction: column; align-items: center; gap: 0.4rem;
  color: rgba(255,255,255,0.6); font-size: 0.65rem; letter-spacing: 0.2em;
  font-family: var(--ff-display); animation: scroll-hint 2s ease-in-out infinite;
}
.hero__scroll-hint svg { width: 18px; height: 18px; }
@keyframes scroll-hint { 0%,100% { transform: translateX(-50%) translateY(0); opacity:0.6; } 50% { transform: translateX(-50%) translateY(5px); opacity:1; } }

@media (prefers-reduced-motion: reduce) {
  .hero__video-wrap, .hero__cover { display: none; }
  .hero { background: linear-gradient(160deg, #991B1B 0%, #1A0505 100%); }
}

/* ============================================================
   ボタン
   ============================================================ */
.btn-primary {
  display: inline-flex; align-items: center; gap: 0.5rem;
  background: linear-gradient(135deg, var(--c-red) 0%, var(--c-red-dark) 100%);
  color: #fff; padding: 0.9rem 2rem; border-radius: var(--radius-pill);
  font-weight: 800; font-size: 0.95rem; box-shadow: var(--shadow-cta);
  transition: transform var(--t-fast), box-shadow var(--t-fast); position: relative; overflow: hidden;
}
.btn-primary::before {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.2) 0%, transparent 50%);
  pointer-events: none;
}
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 14px 36px rgba(220,38,38,0.45); }

.btn-outline {
  display: inline-flex; align-items: center; gap: 0.5rem;
  border: 2px solid rgba(255,255,255,0.5); color: #fff;
  padding: 0.9rem 2rem; border-radius: var(--radius-pill);
  font-weight: 800; font-size: 0.95rem; backdrop-filter: blur(4px);
  transition: border-color var(--t-fast), background var(--t-fast);
}
.btn-outline:hover { border-color: #fff; background: rgba(255,255,255,0.1); }

.btn-red {
  display: inline-flex; align-items: center; gap: 0.5rem;
  background: var(--c-red); color: #fff;
  padding: 0.75rem 1.75rem; border-radius: var(--radius-pill);
  font-weight: 800; font-size: 0.9rem;
  transition: background var(--t-fast), transform var(--t-fast);
}
.btn-red:hover { background: var(--c-red-dark); transform: translateY(-2px); }

/* ============================================================
   セクション共通
   ============================================================ */
.section-eyebrow {
  display: inline-flex; align-items: center; gap: 0.4rem;
  font-family: var(--ff-display); font-size: 0.78rem;
  letter-spacing: 0.25em; color: var(--c-red); margin-bottom: 0.9rem;
}
.section-eyebrow::before {
  content: ''; display: block; width: 24px; height: 2px; background: var(--c-red); border-radius: 1px;
}

.section-title {
  font-family: var(--ff-display); font-size: clamp(1.8rem, 4vw, 2.8rem);
  line-height: 1.15; letter-spacing: 0.02em; margin-bottom: 1rem;
}

.section-lead {
  font-size: clamp(0.95rem, 1.7vw, 1.1rem); font-weight: 500; line-height: 2;
  color: var(--c-text-soft); max-width: 640px;
}

.link-more {
  display: inline-flex; align-items: center; gap: 0.3rem;
  background: var(--c-red-soft); color: var(--c-red);
  padding: 0.4rem 0.9rem; border-radius: var(--radius-pill);
  font-size: 0.8rem; font-weight: 700;
  transition: background var(--t-fast), color var(--t-fast);
}
.link-more:hover { background: var(--c-red); color: #fff; }

/* ============================================================
   更新情報
   ============================================================ */
.updates { background: var(--c-bg); }
.updates__inner { max-width: 800px; }

.updates__list { display: flex; flex-direction: column; gap: 0; border: 1px solid var(--c-line); border-radius: var(--radius-lg); overflow: hidden; }

.updates__item {
  display: grid; grid-template-columns: auto auto 1fr;
  align-items: center; gap: 1rem; padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--c-line); background: var(--c-white);
  transition: background var(--t-fast);
}
.updates__item:last-child { border-bottom: none; }
.updates__item:hover { background: var(--c-bg-warm); }

.updates__date { font-size: 0.82rem; color: var(--c-muted); font-weight: 600; white-space: nowrap; font-variant-numeric: tabular-nums; }
.updates__badge {
  font-size: 0.65rem; font-weight: 800; letter-spacing: 0.05em;
  padding: 0.15rem 0.6rem; border-radius: var(--radius-pill);
  white-space: nowrap;
}
.updates__badge--new  { background: var(--c-red-soft); color: var(--c-red); }
.updates__badge--info { background: var(--c-yellow-soft); color: var(--c-gold); }
.updates__text { font-size: 0.9rem; font-weight: 600; color: var(--c-text); }
.updates__text a { color: var(--c-red); text-decoration: underline; text-underline-offset: 3px; }
.updates__text a:hover { color: var(--c-red-dark); }

/* ============================================================
   開催概要
   ============================================================ */
.overview { background: var(--c-bg-warm); }

.overview__grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: clamp(2rem, 4vw, 3.5rem);
  align-items: start;
}

.overview__dates {
  background: linear-gradient(135deg, var(--c-red-deep) 0%, var(--c-red-dark) 45%, var(--c-red) 100%);
  color: #fff; border-radius: var(--radius-xl); padding: clamp(2rem, 4vw, 3rem);
  position: relative; overflow: hidden;
}
.overview__dates::before {
  content: '2027'; position: absolute; bottom: -1rem; right: -1rem;
  font-family: var(--ff-display); font-size: 8rem; opacity: 0.08;
  line-height: 1; pointer-events: none; letter-spacing: -0.04em;
}
.overview__dates-label {
  font-family: var(--ff-display); font-size: 0.78rem; letter-spacing: 0.3em;
  color: var(--c-yellow); margin-bottom: 1.25rem;
}
.overview__date-row {
  display: flex; align-items: stretch; gap: 0.75rem; margin-bottom: 0.75rem;
}
.overview__date-card {
  flex: 1; background: rgba(255,255,255,0.1); border: 1px solid rgba(255,255,255,0.2);
  border-radius: var(--radius-md); padding: 1rem 0.75rem; text-align: center;
}
.overview__date-card--pre {
  background: rgba(0,0,0,0.1); border-style: dashed;
}
.overview__date-tag { font-size: 0.65rem; font-weight: 800; letter-spacing: 0.15em; color: var(--c-yellow); margin-bottom: 0.25rem; }
.overview__date-num { font-family: var(--ff-display); font-size: clamp(2rem, 4.5vw, 2.8rem); line-height: 1; }
.overview__date-day { font-family: var(--ff-display); font-size: 0.7rem; letter-spacing: 0.25em; opacity: 0.8; margin-top: 0.25rem; }

.overview__details { display: flex; flex-direction: column; gap: 1rem; }
.overview__detail-card {
  background: var(--c-white); border: 1px solid var(--c-line);
  border-radius: var(--radius-lg); padding: 1.25rem 1.5rem;
  display: grid; grid-template-columns: auto 1fr; gap: 1rem; align-items: start;
}
.overview__detail-icon {
  width: 40px; height: 40px; border-radius: 50%;
  background: linear-gradient(135deg, var(--c-orange), var(--c-red));
  display: flex; align-items: center; justify-content: center; color: #fff; flex-shrink: 0;
}
.overview__detail-icon svg { width: 20px; height: 20px; }
.overview__detail-label { font-size: 0.75rem; font-weight: 700; color: var(--c-muted); letter-spacing: 0.05em; margin-bottom: 0.25rem; }
.overview__detail-value { font-size: 0.95rem; font-weight: 700; color: var(--c-text); line-height: 1.5; }
.overview__detail-value .tbd { color: var(--c-muted); font-weight: 500; font-size: 0.85rem; }

@media (max-width: 768px) {
  .overview__grid { grid-template-columns: 1fr; }
}

/* ============================================================
   コンセプト
   ============================================================ */
.concept { background: var(--c-bg); }
.concept__inner { max-width: 960px; }

.concept__lead {
  font-size: clamp(1.25rem, 2.8vw, 1.85rem); font-weight: 900; line-height: 1.9;
  letter-spacing: 0.04em; margin-bottom: clamp(1.5rem, 3vw, 2.25rem);
}
.concept__accent { color: var(--c-red); }

.concept__body { max-width: 720px; }
.concept__body p {
  font-size: clamp(0.95rem, 1.6vw, 1.05rem); font-weight: 500; line-height: 2.2;
  letter-spacing: 0.05em; color: var(--c-text-soft); margin-bottom: 1.5rem;
}
.concept__body p:last-child { margin-bottom: 0; }

.concept__list { margin-bottom: 1.5rem; }
.concept__list li {
  position: relative; padding-left: 1.5em;
  font-size: clamp(0.95rem, 1.6vw, 1.05rem); font-weight: 500; line-height: 1.9;
  letter-spacing: 0.05em; color: var(--c-text-soft);
}
.concept__list li + li { margin-top: 0.75em; }
.concept__list li::before {
  content: ''; position: absolute; left: 0.1em; top: 0.65em;
  width: 8px; height: 8px; border-radius: 50%;
  background: linear-gradient(135deg, var(--c-orange), var(--c-red));
}

.concept__closing {
  display: flex; align-items: center; gap: 1.25rem; margin-top: 2.5rem;
  padding: 1.75rem 2rem; background: var(--c-bg-warm);
  border-left: 4px solid var(--c-red); border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
}
.concept__closing-flame { width: 36px; flex-shrink: 0; }
.concept__closing-text {
  font-size: clamp(1rem, 2vw, 1.2rem); font-weight: 800; line-height: 1.8; letter-spacing: 0.04em;
}

/* ============================================================
   スポンサー
   ============================================================ */
.sponsors-section { background: var(--c-bg-warm); }

.sponsors-cta-box {
  background: var(--c-white); border: 2px solid var(--c-line);
  border-radius: var(--radius-xl); padding: clamp(2rem, 4vw, 3rem);
  text-align: center; margin-bottom: 2.5rem;
  position: relative; overflow: hidden;
}
.sponsors-cta-box::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 4px;
  background: linear-gradient(90deg, var(--c-yellow), var(--c-orange), var(--c-red));
}
.sponsors-cta-box__title {
  font-size: clamp(1.3rem, 3vw, 1.9rem); font-weight: 900; margin-bottom: 0.75rem; letter-spacing: 0.02em;
}
.sponsors-cta-box__text {
  font-size: clamp(0.9rem, 1.5vw, 1rem); color: var(--c-text-soft); line-height: 1.9;
  max-width: 540px; margin-inline: auto; margin-bottom: 1.75rem;
}

.sponsors-placeholder {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 1rem; margin-top: 2rem;
}
.sponsor-slot {
  aspect-ratio: 2 / 1; border: 2px dashed var(--c-line);
  border-radius: var(--radius-lg); display: flex; flex-direction: column;
  align-items: center; justify-content: center; gap: 0.35rem;
  color: var(--c-muted); font-size: 0.72rem; font-weight: 700; letter-spacing: 0.05em;
}
.sponsor-slot svg { width: 24px; height: 24px; opacity: 0.4; }

/* 協賛ティアバッジ */
.tier-badges {
  display: flex; flex-wrap: wrap; gap: 0.6rem; justify-content: center; margin-top: 1.25rem;
}
.tier-badge {
  display: inline-flex; align-items: center; gap: 0.4rem;
  padding: 0.35rem 0.85rem; border-radius: var(--radius-pill); font-size: 0.75rem; font-weight: 800;
}
.tier-badge--platinum { background: #F8F8F8; color: #555; border: 1px solid #ccc; }
.tier-badge--gold     { background: var(--c-yellow-soft); color: var(--c-gold); }
.tier-badge--silver   { background: #f0f0f0; color: #666; }
.tier-badge--bronze   { background: var(--c-orange-soft); color: var(--c-orange); }

/* ============================================================
   主催・運営
   ============================================================ */
.organizers { background: var(--c-bg); }

.organizers__grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem; margin-top: 2rem;
}
.organizer-card {
  background: var(--c-white); border: 1px solid var(--c-line);
  border-radius: var(--radius-xl); padding: 2rem 2rem 1.75rem;
}
.organizer-card__role {
  font-size: 0.68rem; font-weight: 800; letter-spacing: 0.12em;
  color: var(--c-muted); margin-bottom: 0.6rem;
  text-transform: uppercase;
}
.organizer-card__name {
  font-size: clamp(1rem, 2vw, 1.2rem); font-weight: 900;
  color: var(--c-text); margin-bottom: 0.35rem; line-height: 1.3;
}
.organizer-card__sub { font-size: 0.78rem; color: var(--c-muted); font-weight: 600; line-height: 1.5; }
.organizer-card__badge { margin-top: 0.75rem; }
.organizer-card__dot { display: inline-block; width: 10px; height: 10px; border-radius: 50%; margin-right: 0.5rem; }

/* ============================================================
   フッター
   ============================================================ */
.footer {
  background: var(--c-bg);
  padding: clamp(2rem, 4vw, 3rem) 0 1.5rem;
  border-top: 1px solid var(--c-line);
}
.footer__top {
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap; gap: 1.5rem; padding-bottom: 2rem; border-bottom: 1px solid var(--c-line);
}
.footer__logo { display: flex; align-items: center; gap: 0.6rem; }
.footer__logo-flame { width: 28px; height: 34px; }
.footer__logo-text { font-size: 0.85rem; font-weight: 900; }
.footer__logo-text span { color: var(--c-red); }
.footer__logo-year { font-size: 0.7rem; color: var(--c-muted); margin-top: 0.1rem; font-weight: 700; letter-spacing: 0.1em; }

.footer__nav { display: flex; flex-wrap: wrap; gap: 0; }
.footer__nav-link { padding: 0.4rem 0.85rem; font-size: 0.78rem; color: var(--c-text-soft); font-weight: 600; transition: color var(--t-fast); }
.footer__nav-link:hover { color: var(--c-red); }

.footer__bottom {
  display: flex; justify-content: space-between; align-items: center;
  flex-wrap: wrap; gap: 1rem; padding-top: 1.5rem;
}
.footer__organizers { display: flex; align-items: center; gap: 1rem; flex-wrap: wrap; }
.footer__organizer-label { font-size: 0.68rem; color: var(--c-muted); font-weight: 700; letter-spacing: 0.05em; }
.footer__organizer-name { font-size: 0.78rem; font-weight: 800; }
.footer__copy { font-size: 0.68rem; color: var(--c-muted); }
.footer__back-to-main {
  display: inline-flex; align-items: center; gap: 0.3rem;
  font-size: 0.75rem; color: var(--c-text-soft); font-weight: 600;
  transition: color var(--t-fast);
}
.footer__back-to-main:hover { color: var(--c-red); }

/* ============================================================
   コンテンツ詳細ページ
   ============================================================ */
.page-hero {
  background: linear-gradient(160deg, var(--c-red-deep) 0%, var(--c-red) 100%);
  color: #fff; padding: clamp(3rem, 7vw, 5.5rem) 0 clamp(2.5rem, 5vw, 4rem);
  position: relative; overflow: hidden;
}
.page-hero::before {
  content: ''; position: absolute; top: -100px; right: -100px;
  width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(251,191,36,0.15), transparent 70%);
  border-radius: 50%;
}
.page-hero__eyebrow {
  font-family: var(--ff-display); font-size: 0.75rem; letter-spacing: 0.3em;
  color: var(--c-yellow); margin-bottom: 0.75rem;
}
.page-hero__title {
  font-family: var(--ff-display); font-size: clamp(2rem, 5vw, 3.5rem);
  line-height: 1.1; letter-spacing: 0.02em; margin-bottom: 1rem;
}
.page-hero__desc {
  font-size: clamp(0.95rem, 1.7vw, 1.1rem); font-weight: 500; line-height: 1.9;
  opacity: 0.9; max-width: 620px;
}

.content-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: clamp(1.5rem, 3vw, 2.5rem);
  margin-top: 2rem;
}
.content-card {
  background: var(--c-white); border: 1px solid var(--c-line);
  border-radius: var(--radius-xl); overflow: hidden;
  transition: transform var(--t-med), box-shadow var(--t-med);
}
.content-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.content-card__header {
  padding: 1.75rem 1.75rem 1.25rem;
  background: linear-gradient(135deg, var(--c-bg-warm), var(--c-white));
}
.content-card__icon {
  width: 48px; height: 48px; border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--c-orange), var(--c-red));
  display: flex; align-items: center; justify-content: center; color: #fff;
  margin-bottom: 1rem;
}
.content-card__icon svg { width: 24px; height: 24px; }
.content-card__title { font-size: 1.15rem; font-weight: 900; margin-bottom: 0.35rem; }
.content-card__body { padding: 0 1.75rem 1.75rem; }
.content-card__desc { font-size: 0.9rem; color: var(--c-text-soft); line-height: 1.9; }
.content-card__coming {
  display: inline-flex; align-items: center; gap: 0.35rem; margin-top: 1rem;
  font-size: 0.72rem; font-weight: 800; letter-spacing: 0.08em;
  color: var(--c-muted); background: var(--c-bg-warm);
  padding: 0.3rem 0.75rem; border-radius: var(--radius-pill);
}

@media (max-width: 680px) {
  .content-grid { grid-template-columns: 1fr; }
}

/* ============================================================
   協賛募集ページ
   ============================================================ */
.sponsor-why {
  background: var(--c-bg-warm);
}
.sponsor-why__list {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.25rem; margin-top: 2rem;
}
.sponsor-why__item {
  background: var(--c-white); border-radius: var(--radius-xl); padding: 1.75rem 1.5rem;
  text-align: center;
}
.sponsor-why__num {
  font-family: var(--ff-display); font-size: 2.5rem; color: var(--c-red);
  line-height: 1; margin-bottom: 0.5rem;
}
.sponsor-why__label { font-size: 0.75rem; font-weight: 700; color: var(--c-muted); margin-bottom: 0.75rem; }
.sponsor-why__text { font-size: 0.88rem; font-weight: 700; line-height: 1.6; }

@media (max-width: 680px) {
  .sponsor-why__list { grid-template-columns: 1fr; }
}

.tier-table-wrap { overflow-x: auto; margin-top: 2rem; }
.tier-table {
  width: 100%; border-collapse: collapse; min-width: 600px;
  font-size: 0.88rem;
}
.tier-table th, .tier-table td {
  padding: 1rem 1.25rem; text-align: center;
  border-bottom: 1px solid var(--c-line);
}
.tier-table th { font-weight: 800; font-size: 0.8rem; letter-spacing: 0.05em; }
.tier-table th:first-child, .tier-table td:first-child { text-align: left; font-weight: 700; }
.tier-table thead tr { background: var(--c-bg-warm); }
.tier-table tbody tr:hover { background: var(--c-bg-cream); }
.tier-table .check { color: var(--c-red); font-size: 1rem; }
.tier-table .dash  { color: var(--c-line); }
.tier-table .col-platinum { background: rgba(200,200,200,0.1); }
.tier-table .col-gold     { background: rgba(251,191,36,0.06); }
.tier-table .col-silver   { background: rgba(200,200,210,0.06); }
.tier-table .col-bronze   { background: rgba(249,115,22,0.05); }

/* ============================================================
   FAQ ページ
   ============================================================ */
.faq-section { background: var(--c-bg); }

.faq-list { display: flex; flex-direction: column; gap: 0.75rem; margin-top: 2rem; max-width: 820px; }

.faq-item {
  border: 1px solid var(--c-line); border-radius: var(--radius-lg);
  background: var(--c-white); overflow: hidden;
  transition: border-color var(--t-fast), box-shadow var(--t-fast);
}
.faq-item.is-open { border-color: rgba(220,38,38,0.3); box-shadow: var(--shadow-sm); }

.faq-item__q {
  display: flex; align-items: center; gap: 1rem;
  padding: 1.1rem 1.25rem; cursor: pointer;
  font-size: 0.95rem; font-weight: 700; color: var(--c-text); line-height: 1.5;
  user-select: none;
}
.faq-item__q:hover { background: var(--c-bg-warm); }
.faq-item__label {
  width: 28px; height: 28px; border-radius: 50%; flex-shrink: 0;
  background: linear-gradient(135deg, var(--c-orange), var(--c-red));
  color: #fff; font-family: var(--ff-display); font-size: 0.78rem;
  display: flex; align-items: center; justify-content: center;
}
.faq-item__text { flex: 1; }
.faq-item__chevron { width: 18px; height: 18px; color: var(--c-muted); flex-shrink: 0; transition: transform var(--t-fast); }
.faq-item.is-open .faq-item__chevron { transform: rotate(180deg); }

.faq-item__a { max-height: 0; overflow: hidden; transition: max-height 0.4s ease, padding var(--t-med); padding: 0 1.25rem; }
.faq-item.is-open .faq-item__a { max-height: 500px; padding: 0 1.25rem 1.25rem; }
.faq-item__a p { font-size: 0.9rem; color: var(--c-text-soft); line-height: 2; padding-left: 2.5rem; }

/* ============================================================
   お問合せページ
   ============================================================ */
.contact-section { background: var(--c-bg); }

.contact-form {
  max-width: 680px; background: var(--c-white);
  border: 1px solid var(--c-line); border-radius: var(--radius-xl);
  padding: clamp(2rem, 4vw, 3rem); margin-top: 2rem;
}

.form-group { margin-bottom: 1.5rem; }
.form-label {
  display: block; font-size: 0.82rem; font-weight: 800;
  color: var(--c-text); margin-bottom: 0.4rem; letter-spacing: 0.03em;
}
.form-label .required {
  color: var(--c-red); font-size: 0.7rem; margin-left: 0.3rem; font-weight: 700;
}
.form-input, .form-select, .form-textarea {
  width: 100%; padding: 0.75rem 1rem; font-size: 0.95rem; font-family: inherit;
  border: 1.5px solid var(--c-line); border-radius: var(--radius-md);
  background: var(--c-bg); color: var(--c-text); font-weight: 500;
  transition: border-color var(--t-fast), box-shadow var(--t-fast);
}
.form-input:focus, .form-select:focus, .form-textarea:focus {
  outline: none; border-color: var(--c-red);
  box-shadow: 0 0 0 3px rgba(220,38,38,0.12);
}
.form-textarea { resize: vertical; min-height: 140px; }
.form-select { appearance: none; cursor: pointer; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%239CA3AF' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 0.75rem center; padding-right: 2.5rem; }
.form-hint { font-size: 0.75rem; color: var(--c-muted); margin-top: 0.4rem; }

.form-submit { margin-top: 2rem; display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 1rem; }
.form-privacy { font-size: 0.78rem; color: var(--c-muted); line-height: 1.7; }
.form-privacy a { color: var(--c-red); }

.contact-info { margin-top: 2.5rem; max-width: 680px; }
.contact-info__item { display: flex; align-items: flex-start; gap: 0.75rem; padding: 1rem 0; border-bottom: 1px solid var(--c-line); }
.contact-info__item:last-child { border-bottom: none; }
.contact-info__icon { width: 20px; height: 20px; color: var(--c-red); flex-shrink: 0; margin-top: 0.1rem; }
.contact-info__body { font-size: 0.88rem; line-height: 1.7; }
.contact-info__label { font-weight: 700; color: var(--c-text); }
.contact-info__text  { color: var(--c-text-soft); }

/* ============================================================
   アニメーション
   ============================================================ */
[data-animate] { opacity: 0; transform: translateY(20px); transition: opacity 0.7s ease, transform 0.7s ease; }
[data-animate].is-visible { opacity: 1; transform: translateY(0); }

/* ============================================================
   レスポンシブ
   ============================================================ */
@media (max-width: 1024px) {
  :root { --header-h: 68px; }
  .nav { display: none; }
  .hamburger { display: flex; }
  .hero__badge-dates { display: none; }
}

@media (max-width: 640px) {
  .hero__title { font-size: clamp(2.8rem, 14vw, 4.5rem); }
  .hero__year   { font-size: clamp(1.2rem, 5vw, 1.8rem); }
  .footer__bottom { flex-direction: column; align-items: flex-start; }
  .updates__item { grid-template-columns: 1fr; gap: 0.25rem; }
  .contact-form { padding: 1.5rem; }
}