/* =========================================================
   暗海研究所 / ABYSS LAB — 発光 shinkai
   深海の冷たい発光（シアン/菫/生物発光の緑）。深度でスクロール駆動。
   ========================================================= */

:root{
  --abyss:#03060a;         /* ほぼ黒（開始） */
  --abyss-2:#050d15;       /* 少し青みの黒 */
  --panel:#07131d;
  --cyan:#4fe3d0;
  --blue:#5b8cff;
  --violet:#8a7cff;
  --green:#9cff8f;
  --rose:#ff8f6b;
  --ink:#e7f3f5;
  --mut:#7f9aa6;
  --mut-2:#4f6673;
  --hair:rgba(120,180,200,.14);
  --hair-2:rgba(120,180,200,.08);
  --mono:'IBM Plex Mono',ui-monospace,monospace;
  --grot:'Space Grotesk',system-ui,sans-serif;
  --jp:'Zen Kaku Gothic New',system-ui,sans-serif;
  --depth:0;               /* JSが 0..1 を書き込む */
}

*{box-sizing:border-box}
html{ -webkit-text-size-adjust:100%; }
body{
  margin:0;
  background:var(--abyss);
  color:var(--ink);
  font-family:var(--jp);
  font-weight:400;
  line-height:1.85;
  letter-spacing:.01em;
  overflow-x:hidden;              /* 横スクロール禁止 */
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
h1,h2,h3{margin:0;font-weight:500;letter-spacing:.01em;line-height:1.28}
::selection{background:rgba(79,227,208,.28);color:#fff}

.wrap{max-width:1180px;margin:0 auto;padding:0 40px}

/* ---------- 固定の発光フィールド & ヴェール ---------- */
#field{
  position:fixed; inset:0; z-index:0;
  width:100vw; height:100vh;
  display:block; pointer-events:none;
}
.depth-veil{
  position:fixed; inset:0; z-index:1; pointer-events:none;
  /* 深くなるほど周辺〜全体が沈む */
  background:
    radial-gradient(120% 80% at 50% -10%, rgba(30,70,90,calc(.16 * (1 - var(--depth)))), transparent 60%),
    linear-gradient(180deg, rgba(2,5,9,calc(.2 + .7*var(--depth))), rgba(1,3,6,calc(.35 + .62*var(--depth))));
  transition:background .2s linear;
}
.edge-vignette{
  position:fixed; inset:0; z-index:1; pointer-events:none;
  background:radial-gradient(130% 120% at 50% 42%, transparent 52%, rgba(0,0,0,.72) 100%);
}

/* ---------- ロード幕 ---------- */
.ck-load{ --ck-load-bg:#03060a; --ck-load-fg:var(--cyan); }
.load-inner{ text-align:center; display:grid; gap:18px; justify-items:center; }
.load-code{ font-family:var(--mono); font-size:11px; letter-spacing:.42em; color:var(--cyan); margin:0; text-indent:.42em; }
.ck-load .ck-load__bar{ width:220px; background:rgba(79,227,208,.16); }
.ck-load .ck-load__bar>span{ background:linear-gradient(90deg,var(--cyan),var(--green)); }
.load-note{ font-family:var(--mono); font-size:11px; letter-spacing:.24em; color:var(--mut-2); margin:0; }

/* ---------- 水深HUD ---------- */
.hud{
  position:fixed; top:50%; right:16px; transform:translateY(-50%);
  z-index:40; display:grid; gap:11px; justify-items:end;
  pointer-events:none;
  padding:16px 16px 16px 20px;
  background:rgba(3,9,15,.52);
  backdrop-filter:blur(11px); -webkit-backdrop-filter:blur(11px);
  border:1px solid var(--hair); border-radius:14px;
  box-shadow:0 20px 50px -30px rgba(0,0,0,.9);
}
.hud-num{ font-family:var(--mono); font-weight:500; color:var(--cyan);
  font-size:15px; letter-spacing:.06em; display:flex; align-items:baseline; gap:3px;
  text-shadow:0 0 18px rgba(79,227,208,.4); }
.hud-num span{ font-size:30px; font-weight:600; font-variant-numeric:tabular-nums; }
.hud-num i{ font-style:normal; font-size:13px; color:var(--mut); }
.hud-track{ width:2px; height:150px; background:var(--hair); border-radius:2px; overflow:hidden; position:relative; }
.hud-fill{ position:absolute; left:0; top:0; width:100%; height:0%;
  background:linear-gradient(180deg,var(--cyan),var(--violet)); border-radius:2px; }
.hud-zone{ text-align:right; line-height:1.35; }
.hud-zone b{ display:block; font-size:11.5px; font-weight:500; color:var(--ink); letter-spacing:.08em; }
.hud-zone i{ font-family:var(--mono); font-style:normal; font-size:9.5px; letter-spacing:.24em; color:var(--mut-2); }

/* ---------- ヘッダー ---------- */
.masthead{
  position:fixed; top:0; left:0; right:0; z-index:45;
  display:flex; align-items:center; justify-content:space-between; gap:24px;
  padding:16px 40px;
  background:rgba(4,10,16,.64);
  backdrop-filter:blur(14px); -webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid var(--hair);
  transition:background .4s var(--ck-ease), box-shadow .4s var(--ck-ease);
}
.masthead.is-scrolled{
  background:rgba(3,8,13,.86);
  box-shadow:0 12px 34px -20px rgba(0,0,0,.92);
}
.brand{ display:flex; align-items:center; gap:11px; }
.brand-mark{ width:26px; height:26px; display:block; color:var(--cyan); filter:drop-shadow(0 0 8px rgba(79,227,208,.5)); }
.brand-mark svg{ width:100%; height:100%; fill:none; stroke:currentColor; stroke-width:1.6; stroke-linecap:round; }
.brand-name{ display:grid; line-height:1.05; }
.brand-name b{ font-weight:700; font-size:14px; letter-spacing:.06em; }
.brand-name i{ font-family:var(--mono); font-style:normal; font-size:9px; letter-spacing:.34em; color:var(--mut); }
.mast-nav{ display:flex; gap:26px; }
.mast-nav a{ font-size:12.5px; color:var(--mut); letter-spacing:.04em; transition:color .3s; position:relative; }
.mast-nav a::after{ content:''; position:absolute; left:0; bottom:-5px; width:0; height:1px; background:var(--cyan); transition:width .35s var(--ck-ease); }
.mast-nav a:hover{ color:var(--ink); }
.mast-nav a:hover::after{ width:100%; }
.mast-tag{ font-family:var(--mono); font-size:10px; letter-spacing:.28em; color:var(--mut-2); }

/* ---------- 共通セクション見出し ---------- */
section{ position:relative; z-index:2; }
section[id]{ scroll-margin-top:86px; }
.sec-head{ max-width:760px; margin:0 0 62px; }
.sec-en{ font-family:var(--mono); font-size:11px; letter-spacing:.34em; text-transform:uppercase;
  color:var(--cyan); margin:0 0 18px; display:flex; align-items:center; gap:12px; }
.sec-en::before{ content:''; width:30px; height:1px; background:linear-gradient(90deg,var(--cyan),transparent); }
.sec-jp{ font-size:clamp(30px,4.4vw,52px); font-weight:500; letter-spacing:.02em; line-height:1.24; }
.sec-note{ margin:20px 0 0; color:var(--mut); font-size:15px; max-width:600px; }

/* ======================================================
   1. 入口 / 沈降
   ====================================================== */
.descent{
  min-height:164vh; position:relative;
  display:flex; align-items:flex-start;
}
.descent-stage{
  position:sticky; top:0; height:100vh;
  display:flex; flex-direction:column; justify-content:center;
  max-width:1180px; margin:0 auto; padding:0 40px; width:100%;
}
.kicker{ font-family:var(--mono); font-size:11.5px; letter-spacing:.28em; text-transform:uppercase;
  color:var(--mut); display:inline-flex; align-items:center; gap:12px; margin:0 0 30px; }
.tick{ width:7px; height:7px; border-radius:50%; background:var(--cyan);
  box-shadow:0 0 12px var(--cyan); animation:pulse 2.6s ease-in-out infinite; }
@keyframes pulse{ 0%,100%{opacity:.4;transform:scale(.8)} 50%{opacity:1;transform:scale(1.15)} }
.hero-title{
  font-size:clamp(33px,5.2vw,62px); font-weight:500; line-height:1.24; letter-spacing:.01em;
  max-width:15.5em; color:#eafaff;
}
.hero-title .ht-grad{
  background:linear-gradient(176deg,#f4fcfe 0%, #cdeeeb 46%, #86bcdd 100%);
  -webkit-background-clip:text; background-clip:text; color:transparent;
  filter:drop-shadow(0 0 42px rgba(79,227,208,.16));
}
.hero-lead{ margin:34px 0 0; max-width:52ch; color:#b8d0d6; font-size:16.5px; line-height:2; }
.hero-read{ margin:44px 0 0; display:inline-flex; align-items:center; gap:16px;
  font-family:var(--mono); font-size:12px; letter-spacing:.14em; color:var(--mut);
  padding:12px 18px; border:1px solid var(--hair); border-radius:100px;
  background:rgba(7,19,29,.4); backdrop-filter:blur(4px); }
.hero-read .hr-k{ color:var(--mut-2); letter-spacing:.2em; text-transform:uppercase; font-size:10px; }
.hero-read .hr-v{ color:var(--cyan); font-size:15px; font-weight:500; }
.hero-read .hr-v i{ font-style:normal; font-variant-numeric:tabular-nums; }
.hero-read .hr-b{ width:90px; height:2px; background:var(--hair); border-radius:2px; overflow:hidden; }
.hero-read .hr-b b{ display:block; height:100%; width:0; background:linear-gradient(90deg,var(--cyan),var(--violet)); }

.scroll-cue{ position:absolute; left:50%; bottom:34px; transform:translateX(-50%);
  display:flex; flex-direction:column; align-items:center; gap:10px;
  font-family:var(--mono); font-size:9.5px; letter-spacing:.4em; color:var(--mut-2); z-index:3; }
.scroll-cue span{ width:1px; height:46px; background:linear-gradient(180deg,var(--cyan),transparent); position:relative; overflow:hidden; }
.scroll-cue span::after{ content:''; position:absolute; left:0; top:-50%; width:100%; height:50%;
  background:var(--cyan); animation:drip 2.2s ease-in-out infinite; }
@keyframes drip{ 0%{top:-50%} 60%,100%{top:120%} }

/* ======================================================
   2. なぜ光るのか
   ====================================================== */
.why{ padding:150px 0 130px; }
.why-grid{ display:grid; grid-template-columns:repeat(3,1fr); gap:26px; }
.why-card{
  position:relative; overflow:hidden;
  border:1px solid var(--hair); border-radius:16px;
  padding:0 30px 34px;
  background:linear-gradient(180deg, rgba(9,20,30,.5), rgba(4,10,16,.72));
  transition:transform .5s var(--ck-ease), border-color .5s, box-shadow .5s;
  min-height:390px; display:flex; flex-direction:column;
}
.why-card:hover{ transform:translateY(-6px); border-color:rgba(120,190,210,.3);
  box-shadow:0 30px 60px -30px rgba(0,0,0,.8); }
.why-demo{ width:calc(100% + 60px); height:190px; margin:0 -30px 22px; display:block; }
.why-no{ font-family:var(--mono); font-size:12px; letter-spacing:.2em; color:var(--mut-2); }
.why-card h3{ font-size:24px; font-weight:500; margin:8px 0 12px; letter-spacing:.03em; }
.why-card p{ margin:0; color:var(--mut); font-size:14px; line-height:1.9; flex:1; }
.why-role{ margin-top:20px; font-family:var(--mono); font-size:10.5px; letter-spacing:.2em;
  color:var(--ink); display:inline-flex; align-items:center; gap:9px; }
.why-role::before{ content:''; width:22px; height:1px; }
.why-card[data-hue=green] .why-role::before{ background:var(--green); box-shadow:0 0 8px var(--green); }
.why-card[data-hue=cyan] .why-role::before{ background:var(--cyan); box-shadow:0 0 8px var(--cyan); }
.why-card[data-hue=violet] .why-role::before{ background:var(--violet); box-shadow:0 0 8px var(--violet); }

/* ======================================================
   3. 発光の仕組み
   ====================================================== */
.mechanism{ padding:130px 0 140px; }
.reaction{
  display:grid; grid-template-columns:1fr auto 1fr auto 1fr; align-items:stretch; gap:14px;
  position:relative; padding:40px 34px 58px; margin-bottom:64px;
  border:1px solid var(--hair); border-radius:18px;
  background:linear-gradient(180deg, rgba(9,20,30,.42), rgba(4,10,16,.6));
}
.rx-node{ display:flex; flex-direction:column; gap:4px; padding:22px 18px; text-align:center;
  border:1px solid var(--hair-2); border-radius:12px; background:rgba(5,13,21,.6); }
.rx-node b{ font-size:17px; font-weight:500; letter-spacing:.03em; }
.rx-node i{ font-family:var(--mono); font-style:normal; font-size:11px; letter-spacing:.14em; color:var(--mut); }
.rx-node span{ font-size:11.5px; color:var(--mut-2); margin-top:5px; }
.rx-op{ display:grid; place-items:center; font-size:22px; color:var(--mut-2); font-family:var(--mono); }
.rx-out{ border-color:rgba(79,227,208,.45); background:radial-gradient(120% 130% at 50% 120%, rgba(79,227,208,.16), rgba(5,13,21,.7) 70%); }
.rx-out b{ color:#eafffb; }
.rx-glow{ color:var(--cyan) !important; font-weight:600; letter-spacing:.1em;
  text-shadow:0 0 16px rgba(79,227,208,.7); }
/* 反応の矢印は行をまたいで下段中央へ */
.rx-arrow{ grid-column:1 / -1; display:grid; place-items:center; margin:8px 0 -2px;
  color:var(--cyan); opacity:.7; }
.rx-arrow svg{ width:min(60%,520px); height:24px; fill:none; stroke:currentColor; stroke-width:1.4; stroke-linecap:round; stroke-linejoin:round; }
.rx-arrow svg path{ stroke-dasharray:240; stroke-dashoffset:calc(240 - 240 * var(--p,0)); }
.reaction .rx-out{ grid-column:1 / -1; max-width:360px; margin:0 auto; }

.stats{ display:grid; grid-template-columns:repeat(4,1fr); gap:1px; background:var(--hair-2);
  border:1px solid var(--hair); border-radius:16px; overflow:hidden; }
.stat{ padding:32px 26px; background:linear-gradient(180deg, rgba(7,17,26,.72), rgba(4,9,15,.86)); display:flex; flex-direction:column; gap:14px; }
.stat-num{ font-family:var(--mono); font-weight:600; font-size:clamp(34px,4vw,50px); line-height:1;
  letter-spacing:.01em; font-variant-numeric:tabular-nums;
  background:linear-gradient(160deg,#eafffb,#4fe3d0 70%,#8a7cff);
  -webkit-background-clip:text; background-clip:text; color:transparent; }
.stat-lab{ font-size:13px; color:var(--ink); line-height:1.6; }
.stat-lab i{ display:block; font-style:normal; font-size:11.5px; color:var(--mut-2); margin-top:4px; }

/* ======================================================
   4. ギャラリー
   ====================================================== */
.gallery{ padding:120px 0 40px; }
.gallery-head{ margin-bottom:66px; }
.shot{ margin:0 0 130px; position:relative; }
.shot-media{ position:relative; overflow:hidden; border-radius:8px; background:#01040a;
  box-shadow:0 60px 120px -50px rgba(0,0,0,.9); }
.shot-media img{ width:100%; height:100%; object-fit:cover; will-change:transform;
  transform:scale(1.14); }               /* パララックスの遊び代 */
.shot-media::after{ content:''; position:absolute; inset:0;
  background:radial-gradient(120% 120% at 50% 50%, transparent 55%, rgba(1,3,7,.6)); }
.shot-a .shot-media{ height:78vh; max-width:1180px; margin:0 auto; }
.shot-b .shot-media{ height:88vh; width:100%; }
.shot-b{ padding:0; }
.shot-c .shot-media{ height:82vh; max-width:1180px; margin:0 auto; }
.shot figcaption{ position:absolute; bottom:34px; left:40px; z-index:3;
  display:grid; gap:3px; padding:20px 26px;
  background:linear-gradient(180deg, rgba(3,8,14,.2), rgba(3,8,14,.66));
  backdrop-filter:blur(8px); border:1px solid var(--hair); border-radius:12px; }
.shot-b figcaption{ left:auto; right:40px; }
.cap-idx{ font-family:var(--mono); font-size:10px; letter-spacing:.3em; color:var(--cyan); }
.shot figcaption b{ font-size:24px; font-weight:500; letter-spacing:.04em; margin-top:4px; }
.shot figcaption i{ font-family:var(--mono); font-style:normal; font-size:12px; color:var(--mut); letter-spacing:.08em; }
.cap-depth{ margin-top:9px; font-size:12px; color:var(--mut); letter-spacing:.04em; }
.cap-depth em{ font-family:var(--mono); font-style:normal; color:var(--ink); }
.gallery .wrap{ position:relative; }

/* ======================================================
   5. 名鑑
   ====================================================== */
.index{ padding:120px 0 0; }
.filters{ display:flex; flex-wrap:wrap; align-items:center; gap:18px 30px; margin-bottom:38px;
  padding-bottom:30px; border-bottom:1px solid var(--hair); }
.filt-row{ display:flex; align-items:center; gap:14px; }
.filt-key{ font-family:var(--mono); font-size:10px; letter-spacing:.24em; text-transform:uppercase; color:var(--mut-2); }
.chips{ display:flex; flex-wrap:wrap; gap:8px; }
.chip{ font-family:inherit; font-size:12.5px; color:var(--mut); cursor:pointer;
  border:1px solid var(--hair); background:rgba(7,17,26,.5); border-radius:100px;
  padding:7px 15px; display:inline-flex; align-items:center; gap:8px; transition:all .3s var(--ck-ease); }
.chip:hover{ color:var(--ink); border-color:rgba(120,190,210,.3); }
.chip.is-on{ color:#03060a; background:var(--cyan); border-color:var(--cyan); font-weight:500; }
.chip .dot{ width:8px; height:8px; border-radius:50%; background:var(--c,#fff); box-shadow:0 0 8px var(--c,#fff); }
.chip.is-on .dot{ box-shadow:none; }
.filt-count{ margin:0 0 0 auto; font-family:var(--mono); font-size:12px; color:var(--mut); letter-spacing:.06em; }
.filt-count span{ color:var(--cyan); font-weight:600; }

.idx-head{ display:grid; grid-template-columns:2.4fr 1.1fr 1fr 1.3fr; gap:20px;
  padding:0 26px 14px; font-family:var(--mono); font-size:10px; letter-spacing:.2em;
  text-transform:uppercase; color:var(--mut-2); }
.idx-grid{ display:grid; gap:10px; }
.idx-card{ display:grid; grid-template-columns:2.4fr 1.1fr 1fr 1.3fr; gap:20px; align-items:center;
  padding:22px 26px; border:1px solid var(--hair); border-radius:12px;
  background:linear-gradient(180deg, rgba(8,18,28,.5), rgba(4,10,16,.66));
  transition:transform .4s var(--ck-ease), border-color .4s, background .4s;
  animation:idxIn .5s var(--ck-ease) both; }
@keyframes idxIn{ from{opacity:0;transform:translateY(14px)} to{opacity:1;transform:none} }
.idx-card:hover{ transform:translateX(4px); border-color:rgba(120,190,210,.32);
  background:linear-gradient(180deg, rgba(11,24,36,.7), rgba(5,12,20,.8)); }
.ic-name b{ display:block; font-size:17px; font-weight:500; letter-spacing:.03em; }
.ic-name i{ font-family:var(--mono); font-style:normal; font-size:11.5px; color:var(--mut); letter-spacing:.06em; }
.ic-depth{ font-family:var(--mono); font-size:13px; color:var(--ink); font-variant-numeric:tabular-nums; }
.ic-depth small{ display:block; font-size:10px; color:var(--mut-2); letter-spacing:.16em; margin-top:3px; }
.ic-hue{ display:inline-flex; align-items:center; gap:9px; font-size:13px; color:var(--ink); }
.ic-hue .dot{ width:11px; height:11px; border-radius:50%; background:var(--c); box-shadow:0 0 12px var(--c); }
.ic-role{ font-size:13px; color:var(--mut); }
.ic-role b{ color:var(--ink); font-weight:500; }

/* ---------- フッター ---------- */
.footer{ margin-top:120px; padding:70px 0 60px; border-top:1px solid var(--hair);
  background:linear-gradient(180deg, transparent, rgba(2,5,9,.7)); position:relative; z-index:2; }
.footer-inner{ display:grid; justify-items:center; text-align:center; gap:20px; }
.footer-mark{ width:34px; height:34px; color:var(--cyan); filter:drop-shadow(0 0 10px rgba(79,227,208,.5)); }
.footer-mark svg{ width:100%; height:100%; fill:none; stroke:currentColor; stroke-width:1.5; stroke-linecap:round; }
.footer-tag{ font-size:20px; font-weight:500; letter-spacing:.04em; margin:0; color:var(--ink); }
.footer-nav{ display:flex; gap:24px; flex-wrap:wrap; justify-content:center; }
.footer-nav a{ font-size:12.5px; color:var(--mut); transition:color .3s; }
.footer-nav a:hover{ color:var(--cyan); }
.footer-note{ max-width:660px; margin:6px 0 0; font-size:11.5px; line-height:1.8; color:var(--mut-2); }
.footer-copy{ font-family:var(--mono); font-size:10px; letter-spacing:.2em; color:var(--mut-2); margin:0; }

/* ---- 固定深度HUDとの衝突回避（右寄せコンテンツにHUD幅ぶんの余白を確保） ---- */
@media (min-width:1024px){
  .index .wrap{ padding-right:136px; }   /* 名鑑カードの右端をHUDの内側へ */
  .shot-b figcaption{ right:154px; }     /* PLATE 02 キャプションをHUDの内側へ */
}

/* ======================================================
   レスポンシブ（1280px想定を主に、下でも崩れない範囲）
   ====================================================== */
@media (max-width:1024px){
  .why-grid{ grid-template-columns:1fr; max-width:520px; margin:0 auto; }
  .why-card{ min-height:0; }
  .stats{ grid-template-columns:repeat(2,1fr); }
  .reaction{ grid-template-columns:1fr; gap:10px; }
  .rx-op{ padding:2px; }
  .reaction .rx-arrow{ transform:rotate(90deg); margin:14px 0; }
  .idx-card,.idx-head{ grid-template-columns:1.6fr 1fr 1fr; }
  .idx-head span:last-child,.ic-role{ display:none; }
  .hud{ right:16px; }
  .mast-nav{ display:none; }
}
@media (max-width:640px){
  .wrap,.descent-stage,.masthead{ padding-left:22px; padding-right:22px; }
  .stats{ grid-template-columns:1fr; }
  .idx-card,.idx-head{ grid-template-columns:1.4fr 1fr; }
  .idx-head span:nth-child(3),.ic-hue{ display:none; }
  .shot figcaption{ left:22px; right:22px; bottom:22px; }
  .hud-track{ height:90px; }
}

/* ---------- reduced-motion：発光を静止・粒子を止める ---------- */
@media (prefers-reduced-motion:reduce){
  .tick,.scroll-cue span::after{ animation:none; }
  .idx-card{ animation:none; }
  .depth-veil{ transition:none; }
  .shot-media img{ transform:none; }
}