/* ============================================================
   習陵祭 2026 「青春爆裂」 — Core Stylesheet
   ============================================================ */

/* ---------- Font stack ---------- */
/* 筆文字（毛筆）風フォント。Google Fonts の Yuji Syuku / Kaisei Opti を主軸に、
   端末内蔵の日本語毛筆・楷書系フォントへフォールバックする構成。 */
:root {
  --font-brush: "Yuji Syuku", "Kaisei Opti", "HiraMinProN-W6", "Hiragino Mincho ProN",
    "Yu Mincho", "YuMincho", "HGS行書体", "HG正楷書体-PRO", serif;
  --font-impact: "Kaisei Opti", "Yuji Syuku", "Hiragino Mincho ProN", "Yu Mincho", serif;
  --font-ui: "Zen Kaku Gothic New", "Hiragino Sans", "Noto Sans JP", system-ui, sans-serif;

  /* ---------- Palette : 熱・爆裂 ---------- */
  --ink: #0b0608;
  --paper: #f7efe3;
  --blaze-1: #fff3a8;
  --blaze-2: #ffb400;
  --blaze-3: #ff5a1f;
  --blaze-4: #e01b3c;
  --blaze-5: #8a0f52;
  --sakura: #ff8fb8;
  --sky: #2b6fe0;

  --shell-x: clamp(18px, 5vw, 84px);
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: auto;
}
body {
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-ui);
  font-weight: 500;
  overflow-x: hidden;
  line-height: 1.75;
  letter-spacing: .02em;
  -webkit-font-smoothing: antialiased;
}
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; }
::selection { background: var(--blaze-3); color: #fff; }

/* 和紙のざらつき + 燃え残りのノイズ */
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 9000;
  pointer-events: none;
  opacity: .22;
  mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)' opacity='.55'/%3E%3C/svg%3E");
}

/* ============================================================
   Typography — 筆文字
   ============================================================ */
.brush {
  font-family: var(--font-brush);
  font-weight: 400;
  line-height: 1.02;
  letter-spacing: .04em;
  text-shadow: 0 0 .04em rgba(0,0,0,.35);
}

/* 炎グラデーションが背後で動く文字 */
.blaze-text {
  background-image: linear-gradient(
    100deg,
    var(--blaze-1) 0%,
    var(--blaze-2) 18%,
    var(--blaze-3) 38%,
    var(--blaze-4) 58%,
    var(--blaze-3) 74%,
    var(--blaze-2) 88%,
    var(--blaze-1) 100%
  );
  background-size: 320% 100%;
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
  animation: blazeFlow 5.5s linear infinite;
  filter: drop-shadow(0 0 22px rgba(255, 90, 31, .55))
          drop-shadow(0 0 60px rgba(224, 27, 60, .35));
}
@keyframes blazeFlow {
  0%   { background-position:   0% 50%; }
  100% { background-position: 320% 50%; }
}

/* 白抜き墨文字（画像の上でよく効く） */
.ink-text {
  color: #fff;
  text-shadow:
    0 2px 0 rgba(0,0,0,.35),
    0 0 30px rgba(0,0,0,.55),
    0 0 90px rgba(0,0,0,.45);
}

/* 縦書き（PCのみ・スマホでは自動解除） */
.vertical {
  writing-mode: vertical-rl;
  text-orientation: upright;
  font-feature-settings: "vkrn" 1;
}

/* ============================================================
   Loader
   ============================================================ */
#loader {
  position: fixed;
  inset: 0;
  z-index: 9500;
  display: grid;
  place-items: center;
  background: radial-gradient(circle at 50% 60%, #2a0710 0%, #0b0608 65%);
  transition: opacity .7s ease, visibility .7s ease;
}
#loader.done { opacity: 0; visibility: hidden; }
#loader .load-mark {
  font-family: var(--font-brush);
  font-size: clamp(48px, 14vw, 130px);
  line-height: 1;
  letter-spacing: .1em;
}
#loader .load-bar {
  margin-top: 26px;
  width: min(240px, 60vw);
  height: 3px;
  background: rgba(255,255,255,.16);
  overflow: hidden;
  border-radius: 99px;
}
#loader .load-bar span {
  display: block;
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--blaze-2), var(--blaze-4));
  transition: width .25s ease;
}
#loader .load-num {
  margin-top: 12px;
  font-size: 11px;
  letter-spacing: .35em;
  color: rgba(255,255,255,.55);
}

/* ============================================================
   Header
   ============================================================ */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 800;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px var(--shell-x);
  background: linear-gradient(180deg, rgba(11,6,8,.72), rgba(11,6,8,0));
  backdrop-filter: blur(2px);
  transition: background .4s ease, padding .4s ease;
}
.site-header.solid {
  background: rgba(11,6,8,.9);
  backdrop-filter: blur(14px) saturate(1.2);
  border-bottom: 1px solid rgba(255,180,0,.16);
}
.brand {
  display: flex;
  align-items: baseline;
  gap: 10px;
}
.brand .brand-mark {
  font-family: var(--font-brush);
  font-size: clamp(21px, 3.4vw, 27px);
  line-height: 1;
  letter-spacing: .06em;
}
.brand .brand-year {
  font-size: 10px;
  letter-spacing: .3em;
  color: rgba(255,255,255,.6);
}

.nav-desktop {
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.8vw, 26px);
  font-size: 13px;
  letter-spacing: .12em;
}
.nav-desktop a { position: relative; padding: 4px 0; color: rgba(255,255,255,.82); }
.nav-desktop a::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 0; height: 2px;
  background: linear-gradient(90deg, var(--blaze-2), var(--blaze-4));
  transition: width .32s cubic-bezier(.2,.8,.2,1);
}
.nav-desktop a:hover { color: #fff; }
.nav-desktop a:hover::after { width: 100%; }
.nav-desktop a.is-current { color: var(--blaze-2); }

.nav-toggle {
  display: none;
  width: 46px; height: 40px;
  background: none;
  border: 1px solid rgba(255,255,255,.28);
  border-radius: 4px;
  color: #fff;
  position: relative;
  cursor: pointer;
}
.nav-toggle i, .nav-toggle i::before, .nav-toggle i::after {
  position: absolute;
  left: 50%;
  width: 20px; height: 1.5px;
  background: currentColor;
  transform: translateX(-50%);
  transition: transform .3s ease, opacity .3s ease;
}
.nav-toggle i { top: 50%; margin-top: -.75px; }
.nav-toggle i::before { content: ""; top: -6px; left: 0; transform: none; }
.nav-toggle i::after  { content: ""; top:  6px; left: 0; transform: none; }
body.nav-open .nav-toggle i { background: transparent; }
body.nav-open .nav-toggle i::before { transform: translateY(6px) rotate(45deg); }
body.nav-open .nav-toggle i::after  { transform: translateY(-6px) rotate(-45deg); }

/* Drawer */
.nav-drawer {
  position: fixed;
  inset: 0;
  z-index: 790;
  display: grid;
  place-content: center;
  gap: 4px;
  background: radial-gradient(circle at 70% 20%, #3a0a17 0%, #0b0608 70%);
  opacity: 0;
  visibility: hidden;
  transition: opacity .45s ease, visibility .45s ease;
}
body.nav-open .nav-drawer { opacity: 1; visibility: visible; }
.nav-drawer a {
  font-family: var(--font-brush);
  font-size: clamp(30px, 9vw, 54px);
  line-height: 1.3;
  text-align: center;
  opacity: 0;
  transform: translateY(24px) scale(.9);
  transition: opacity .5s ease, transform .5s cubic-bezier(.16,1,.3,1);
}
body.nav-open .nav-drawer a { opacity: 1; transform: none; }
.nav-drawer a:nth-child(1) { transition-delay: .08s; }
.nav-drawer a:nth-child(2) { transition-delay: .14s; }
.nav-drawer a:nth-child(3) { transition-delay: .20s; }
.nav-drawer a:nth-child(4) { transition-delay: .26s; }
.nav-drawer a:nth-child(5) { transition-delay: .32s; }
.nav-drawer a:nth-child(6) { transition-delay: .38s; }
.nav-drawer a:hover { color: var(--blaze-2); }

/* ============================================================
   Buttons — 爆裂ボタン
   ============================================================ */
.btn-blast {
  --btn-h: 60px;
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  min-height: var(--btn-h);
  padding: 0 34px;
  border: 0;
  border-radius: 999px;
  font-family: var(--font-impact);
  font-size: clamp(15px, 2.4vw, 18px);
  letter-spacing: .16em;
  color: #fff;
  cursor: pointer;
  overflow: hidden;
  isolation: isolate;
  background: linear-gradient(120deg, var(--blaze-4), var(--blaze-3) 45%, var(--blaze-2));
  background-size: 220% 100%;
  box-shadow:
    0 10px 34px -8px rgba(255, 90, 31, .75),
    0 0 0 1px rgba(255, 220, 150, .38) inset;
  transition: transform .32s cubic-bezier(.16,1,.3,1), box-shadow .32s ease, background-position .6s ease;
}
.btn-blast::before {
  /* 走る閃光 */
  content: "";
  position: absolute;
  inset: -40% -10%;
  z-index: -1;
  background: conic-gradient(from 0deg, transparent 0 65%, rgba(255,255,255,.85) 78%, transparent 88% 100%);
  opacity: 0;
  transition: opacity .3s ease;
  animation: spinFlare 2.4s linear infinite;
}
@keyframes spinFlare { to { transform: rotate(1turn); } }
.btn-blast:hover {
  transform: translateY(-3px) scale(1.035);
  background-position: 100% 0;
  box-shadow:
    0 16px 46px -8px rgba(255, 60, 40, .9),
    0 0 0 1px rgba(255, 240, 200, .6) inset;
}
.btn-blast:hover::before { opacity: .5; }
.btn-blast:active { transform: translateY(0) scale(.985); }
.btn-blast .arrow { transition: transform .3s ease; }
.btn-blast:hover .arrow { transform: translateX(6px); }

.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 54px;
  padding: 0 28px;
  border: 1px solid rgba(255,255,255,.4);
  border-radius: 999px;
  font-size: 14px;
  letter-spacing: .16em;
  backdrop-filter: blur(6px);
  background: rgba(0,0,0,.22);
  transition: border-color .3s ease, background .3s ease, transform .3s ease, color .3s ease;
}
.btn-ghost:hover {
  border-color: var(--blaze-2);
  color: var(--blaze-2);
  background: rgba(0,0,0,.45);
  transform: translateY(-2px);
}

/* ============================================================
   Scroll stage (Top page)
   ============================================================ */
#scroll-stage {
  position: relative;
}
/* 背景シーケンス canvas を全画面固定 */
#seq-wrap {
  position: fixed;
  inset: 0;
  z-index: 0;
  overflow: hidden;
  background: #0b0608;
}
#seq-canvas {
  position: absolute;
  top: 50%; left: 50%;
  width: 100%; height: 100%;
  transform: translate(-50%, -50%);
  object-fit: cover;
  will-change: transform, filter;
}
/* 熱の被膜 */
#seq-veil {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(ellipse at 50% 78%, rgba(255,120,20,.34), transparent 62%),
    linear-gradient(180deg, rgba(11,6,8,.62) 0%, rgba(11,6,8,.14) 34%, rgba(11,6,8,.3) 62%, rgba(11,6,8,.86) 100%);
  mix-blend-mode: multiply;
  opacity: .9;
}
#seq-heat {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(circle at 50% 100%, rgba(255,90,31,.45), transparent 58%);
  mix-blend-mode: screen;
  opacity: 0;
}

/* スクロール量を生む本体。高さは JS が (パネル数 × 1画面強) で設定 */
#scroll-stage { position: relative; z-index: 2; }

/* 画面に固定される器（Sticky）。この中でパネルが入れ替わる */
.stack {
  position: sticky;
  top: 0;
  height: 100svh;
  overflow: hidden;
}

/* 各パネル：器の中で重なり、スクロール量に応じて入れ替わる */
.panel {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  padding: clamp(84px, 12vh, 140px) var(--shell-x) clamp(60px, 10vh, 120px);
  will-change: transform, opacity;
  backface-visibility: hidden;
}
.panel-inner {
  width: min(1180px, 100%);
  text-align: center;
  transform: scale(var(--fit, 1));       /* JS による自動フィット */
  transform-origin: center center;
}
/* JS 未起動 / GSAP 失敗時のフォールバック：通常フローで全部読める */
html.no-js-stack .stack { position: relative; height: auto; overflow: visible; }
html.no-js-stack .panel { position: relative; inset: auto; min-height: 100svh; }

/* ---- Panel 1 : Hero ---- */
.hero-eyebrow {
  font-size: clamp(10px, 2.6vw, 13px);
  letter-spacing: .5em;
  color: rgba(255,255,255,.82);
  margin: 0 0 clamp(18px, 4vh, 34px);
  text-indent: .5em;
}
.hero-title {
  margin: 0;
  font-size: clamp(74px, 22vw, 260px);
  display: flex;
  justify-content: center;
  flex-wrap: nowrap;
  gap: clamp(2px, .8vw, 14px);
}
.hero-title .ch {
  display: inline-block;
  will-change: transform, opacity, filter;
}
.hero-sub {
  margin: clamp(14px, 3.4vh, 30px) 0 0;
  font-family: var(--font-brush);
  font-size: clamp(19px, 5vw, 40px);
  letter-spacing: .3em;
  text-indent: .3em;
}
.hero-meta {
  margin: clamp(22px, 5vh, 44px) 0 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px 22px;
  font-size: clamp(11px, 2.8vw, 14px);
  letter-spacing: .2em;
  color: rgba(255,255,255,.9);
}
.hero-meta span { display: inline-flex; align-items: center; gap: 8px; }
.hero-meta .dot { width: 5px; height: 5px; border-radius: 50%; background: var(--blaze-2); }

.scroll-cue {
  position: absolute;
  left: 50%;
  bottom: clamp(20px, 5vh, 46px);
  transform: translateX(-50%);
  z-index: 3;
  display: grid;
  justify-items: center;
  gap: 8px;
  font-size: 9px;
  letter-spacing: .4em;
  color: rgba(255,255,255,.7);
}
.scroll-cue .line {
  width: 1px; height: 46px;
  background: linear-gradient(180deg, rgba(255,255,255,.85), transparent);
  animation: cueDrop 1.8s ease-in-out infinite;
  transform-origin: top;
}
@keyframes cueDrop {
  0%, 100% { transform: scaleY(.25); opacity: .35; }
  45%      { transform: scaleY(1);  opacity: 1; }
}

/* ---- 汎用セクションヘッド ---- */
.sec-num {
  display: inline-block;
  font-size: 11px;
  letter-spacing: .42em;
  color: var(--blaze-2);
  margin-bottom: clamp(14px, 3vh, 26px);
  padding: 5px 16px;
  border: 1px solid rgba(255,180,0,.42);
  border-radius: 999px;
  background: rgba(0,0,0,.3);
}
.sec-title {
  margin: 0;
  font-size: clamp(46px, 13vw, 150px);
  line-height: .98;
}
.sec-lead {
  margin: clamp(20px, 4vh, 38px) auto 0;
  max-width: 44em;
  font-size: clamp(14px, 3.6vw, 18px);
  line-height: 2.1;
  color: rgba(255,255,255,.9);
  text-shadow: 0 2px 18px rgba(0,0,0,.8);
}
.sec-actions {
  margin-top: clamp(30px, 6vh, 56px);
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 14px 18px;
}

/* ---- カード群 ---- */
.card-row {
  margin: clamp(28px, 6vh, 52px) auto 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 14px;
  max-width: 1000px;
  text-align: left;
}
.blast-card {
  position: relative;
  padding: 22px 20px 20px;
  border-radius: 16px;
  border: 1px solid rgba(255,255,255,.16);
  background: linear-gradient(160deg, rgba(30,10,14,.72), rgba(11,6,8,.62));
  backdrop-filter: blur(10px);
  overflow: hidden;
  transition: transform .4s cubic-bezier(.16,1,.3,1), border-color .4s ease, box-shadow .4s ease;
}
.blast-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 12% 0%, rgba(255,140,40,.3), transparent 62%);
  opacity: 0;
  transition: opacity .45s ease;
}
.blast-card:hover {
  transform: translateY(-8px);
  border-color: rgba(255,180,0,.55);
  box-shadow: 0 20px 50px -18px rgba(255,90,31,.6);
}
.blast-card:hover::before { opacity: 1; }
.blast-card .card-k {
  position: relative;
  font-family: var(--font-brush);
  font-size: clamp(26px, 5.6vw, 38px);
  line-height: 1.1;
  margin-bottom: 10px;
}
.blast-card .card-t {
  position: relative;
  font-size: 10px;
  letter-spacing: .34em;
  color: var(--blaze-2);
  margin-bottom: 12px;
}
.blast-card .card-d {
  position: relative;
  font-size: 13.5px;
  line-height: 1.95;
  color: rgba(255,255,255,.82);
}
.blast-card .card-go {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 16px;
  font-size: 12px;
  letter-spacing: .16em;
  color: #fff;
}
.blast-card .card-go .arrow { transition: transform .3s ease; }
.blast-card:hover .card-go .arrow { transform: translateX(6px); }

/* ---- カウントダウン ---- */
.countdown {
  margin: clamp(26px, 5vh, 44px) auto 0;
  display: flex;
  justify-content: center;
  gap: clamp(10px, 3vw, 28px);
}
.countdown .cd-cell {
  min-width: clamp(66px, 18vw, 110px);
  padding: 14px 8px 12px;
  border-radius: 14px;
  border: 1px solid rgba(255,255,255,.2);
  background: rgba(0,0,0,.42);
  backdrop-filter: blur(8px);
}
.countdown .cd-v {
  font-family: var(--font-impact);
  font-size: clamp(28px, 8vw, 52px);
  line-height: 1;
  font-variant-numeric: tabular-nums;
}
.countdown .cd-l {
  margin-top: 8px;
  font-size: 9.5px;
  letter-spacing: .3em;
  color: rgba(255,255,255,.62);
}

/* ---- Split reveal 文字 ---- */
.reveal-word { display: inline-block; overflow: hidden; vertical-align: bottom; }
.reveal-word > span { display: inline-block; will-change: transform; }

/* ---- 火花 canvas ---- */
#sparks {
  position: fixed;
  inset: 0;
  z-index: 700;
  pointer-events: none;
}

/* ============================================================
   Footer
   ============================================================ */
.site-footer {
  position: relative;
  z-index: 5;
  background: #070405;
  border-top: 1px solid rgba(255,180,0,.18);
  padding: clamp(52px, 9vh, 92px) var(--shell-x) 34px;
}
.footer-grid {
  max-width: 1180px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr;
  gap: 34px;
}
.footer-grid h3 {
  font-family: var(--font-brush);
  font-size: 30px;
  margin: 0 0 12px;
}
.footer-grid p, .footer-grid li {
  font-size: 13px;
  color: rgba(255,255,255,.66);
  line-height: 2;
}
.footer-grid ul { list-style: none; margin: 0; padding: 0; }
.footer-grid ul a:hover { color: var(--blaze-2); }
.footer-note {
  max-width: 1180px;
  margin: 40px auto 0;
  padding-top: 20px;
  border-top: 1px solid rgba(255,255,255,.1);
  font-size: 11px;
  letter-spacing: .12em;
  color: rgba(255,255,255,.4);
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  justify-content: space-between;
}

/* ============================================================
   Sub pages
   ============================================================ */
.sub-hero {
  position: relative;
  min-height: 74svh;
  display: grid;
  place-items: end center;
  padding: clamp(120px, 20vh, 200px) var(--shell-x) clamp(46px, 8vh, 76px);
  overflow: hidden;
  isolation: isolate;
}
.sub-hero .sub-bg {
  position: absolute;
  inset: 0;
  z-index: -2;
  background-size: cover;
  background-position: center;
  transform: scale(1.12);
  will-change: transform;
}
.sub-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(180deg, rgba(11,6,8,.82), rgba(11,6,8,.36) 42%, rgba(11,6,8,.95));
}
.sub-hero .sub-inner { text-align: center; }
.sub-hero h1 {
  margin: 0;
  font-size: clamp(48px, 15vw, 148px);
  line-height: .98;
}
.sub-hero .sub-en {
  margin: 16px 0 0;
  font-size: clamp(10px, 2.6vw, 13px);
  letter-spacing: .48em;
  color: rgba(255,255,255,.72);
}

.sub-body {
  position: relative;
  z-index: 2;
  background: linear-gradient(180deg, #0b0608, #120a0c 60%, #0b0608);
  padding: clamp(56px, 10vh, 110px) var(--shell-x) clamp(70px, 12vh, 130px);
}
.sub-body .wrap { max-width: 1040px; margin: 0 auto; }
.sub-body h2 {
  font-family: var(--font-brush);
  font-size: clamp(32px, 8vw, 62px);
  line-height: 1.2;
  margin: clamp(48px, 8vh, 82px) 0 clamp(18px, 3vh, 26px);
}
.sub-body h2:first-child { margin-top: 0; }
.sub-body h3 {
  font-family: var(--font-impact);
  font-size: clamp(19px, 4.4vw, 26px);
  margin: 34px 0 12px;
  color: var(--blaze-2);
}
.sub-body p { font-size: clamp(14px, 3.5vw, 16px); line-height: 2.1; color: rgba(255,255,255,.86); }
.rule {
  height: 2px;
  border: 0;
  margin: clamp(40px, 7vh, 70px) 0;
  background: linear-gradient(90deg, var(--blaze-4), var(--blaze-2), transparent);
  opacity: .7;
}

/* テーブル（タイムテーブル等） */
.tbl-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; }
table.tt {
  width: 100%;
  min-width: 540px;
  border-collapse: collapse;
  font-size: 14px;
}
table.tt th, table.tt td {
  padding: 14px 12px;
  text-align: left;
  border-bottom: 1px solid rgba(255,255,255,.12);
  vertical-align: top;
}
table.tt thead th {
  font-size: 11px;
  letter-spacing: .24em;
  color: var(--blaze-2);
  border-bottom-color: rgba(255,180,0,.4);
  white-space: nowrap;
}
table.tt td.time {
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
  color: #fff;
  font-weight: 700;
}
table.tt tbody tr { transition: background .25s ease; }
table.tt tbody tr:hover { background: rgba(255,120,30,.09); }

/* リスト */
ul.spark-list { list-style: none; padding: 0; margin: 20px 0 0; }
ul.spark-list li {
  position: relative;
  padding-left: 26px;
  margin-bottom: 12px;
  font-size: 14.5px;
  line-height: 1.95;
  color: rgba(255,255,255,.86);
}
ul.spark-list li::before {
  content: "";
  position: absolute;
  left: 4px; top: .78em;
  width: 8px; height: 8px;
  border-radius: 50%;
  background: linear-gradient(120deg, var(--blaze-2), var(--blaze-4));
  box-shadow: 0 0 12px rgba(255,120,30,.9);
}

/* 情報グリッド */
.info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 14px;
  margin-top: 26px;
}
.info-box {
  padding: 22px;
  border-radius: 14px
  ;border: 1px solid rgba(255,255,255,.14);
  background: rgba(255,255,255,.035);
}
.info-box .k { font-size: 10.5px; letter-spacing: .3em; color: var(--blaze-2); }
.info-box .v { margin-top: 10px; font-size: 16px; line-height: 1.8; color: #fff; }

.back-home {
  margin-top: clamp(52px, 9vh, 90px);
  display: flex;
  justify-content: center;
}

/* fade-up 汎用 */
.fu { opacity: 0; transform: translateY(38px); }

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 900px) {
  .footer-grid { grid-template-columns: 1fr; gap: 26px; }
}
@media (max-width: 780px) {
  .nav-desktop { display: none; }
  .nav-toggle { display: block; }
  /* スマホでは縦書きを解除して崩れを防ぐ */
  .vertical { writing-mode: horizontal-tb; }
  .hero-title { gap: 0; }
  .panel { padding-left: 16px; padding-right: 16px; }
  .card-row { grid-template-columns: 1fr; }
}
@media (max-width: 420px) {
  .hero-title { font-size: 21vw; }
  .sec-title  { font-size: 15vw; }
}

/* アクセシビリティ: モーション低減 */
@media (prefers-reduced-motion: reduce) {
  .blaze-text { animation: none; }
  .scroll-cue .line { animation: none; }
  .btn-blast::before { animation: none; }
}