/* ===================================
   ぽこぽ研究所 共通スタイル
   =================================== */

:root{
  --bg0:#120c09;
  --bg1:#1b110c;
  --card:#1b1410cc;
  --card2:#16100ccc;
  --line:#3a2a22;

  --text:#efe7df;
  --muted:#c5b5a8;

  --accent:#7ee1c4;
  --accent2:#d6a06a;
  --accent3:#8a5a3a;

  --shadow: 0 18px 55px rgba(0,0,0,.58);
  --radius: 18px;
  --maxw: 1060px;
}

*{ box-sizing:border-box; }
/* 白い地(=html)が見えないようにする */
html{
  background: var(--bg1);          /* まず色だけでもOK */
  background-color: var(--bg1);
  scroll-behavior: smooth;
}

/* height:100% ではなく min-height に */
html, body{
  min-height: 100%;
}
body{
  min-height: 100vh;
  background-color: var(--bg1);
  margin:0;
  color:var(--text);
  background:
    radial-gradient(1200px 650px at 15% -10%, rgba(214,160,106,.30), transparent 58%),
    radial-gradient(1000px 620px at 85% 0%, rgba(126,225,196,.12), transparent 60%),
    radial-gradient(900px 700px at 50% 115%, rgba(138,90,58,.22), transparent 60%),
    linear-gradient(180deg, var(--bg0), var(--bg1));
  background-attachment: scroll;
  font-family: ui-sans-serif, system-ui, -apple-system, "Hiragino Sans", "Noto Sans JP", "Segoe UI", Arial, sans-serif;
  letter-spacing: .02em;
  overflow-x:hidden;
}
body::before{
  content:"";
  position:fixed; inset:0;
  pointer-events:none;
  background:
    radial-gradient(circle at 20% 30%, rgba(255,255,255,.05), transparent 42%),
    radial-gradient(circle at 75% 45%, rgba(255,255,255,.035), transparent 45%),
    radial-gradient(circle at 45% 90%, rgba(255,255,255,.03), transparent 48%),
    radial-gradient(1200px 700px at 50% 50%, transparent 55%, rgba(0,0,0,.35) 92%);
  mix-blend-mode: overlay;
  opacity:.55;
  filter: blur(.2px);
}
body::after{
  content:"";
  position:fixed; inset:0;
  pointer-events:none;
  background:
    radial-gradient(260px 180px at 30% 20%, rgba(255,255,255,.05), transparent 60%),
    radial-gradient(320px 220px at 65% 30%, rgba(255,255,255,.04), transparent 62%),
    radial-gradient(280px 200px at 50% 55%, rgba(255,255,255,.03), transparent 62%);
  filter: blur(10px);
  opacity:.25;
  animation: steam 14s ease-in-out infinite;
  transform: translateY(0);
}
@keyframes steam{
  0%{ transform: translateY(0) scale(1); opacity:.18; }
  50%{ transform: translateY(-18px) scale(1.02); opacity:.28; }
  100%{ transform: translateY(0) scale(1); opacity:.18; }
}

a{ color:inherit; text-decoration:none; }
a:hover{ text-decoration:underline; text-underline-offset: 3px; }

.wrap{ width:min(var(--maxw), calc(100% - 36px)); margin:0 auto; }

/* ===================================
   ヘッダー
   =================================== */
header{
  position:sticky; top:0; z-index:50;
  backdrop-filter: blur(14px);
  background: linear-gradient(180deg, rgba(18,12,9,.88), rgba(18,12,9,.56));
  border-bottom:1px solid rgba(255,255,255,.06);
}
.header-inner{
  display:flex; align-items:center; justify-content:space-between;
  padding: 18px 0; gap:16px;
}
.brand{ display:flex; align-items:baseline; gap:10px; min-height:34px; }

.title{
  font-size: clamp(18px, 2.4vw, 26px);
  font-weight: 760;
  letter-spacing: .07em;
  position:relative;
  line-height:1.2;
  background: linear-gradient(90deg, #efe7df, #f2d7bf, #cfeee4, #efe7df);
  background-size: 280% 100%;
  -webkit-background-clip: text;
  background-clip:text;
  color: transparent;
  animation: shimmer 7.2s ease-in-out infinite;
  text-shadow: 0 0 18px rgba(126,225,196,.08);
  padding-bottom: 2px;
}
.title::after{
  content:"";
  position:absolute;
  left:0; right:0; bottom:-6px;
  height:2px; border-radius:99px;
  background: linear-gradient(90deg, transparent, rgba(126,225,196,.75), rgba(214,160,106,.85), transparent);
  opacity:.75;
  transform: translateX(-40%);
  animation: scan 2.9s ease-in-out infinite alternate;
}
@keyframes shimmer{
  0%{ background-position: 0% 50%; }
  50%{ background-position: 100% 50%; }
  100%{ background-position: 0% 50%; }
}
@keyframes scan{
  0%   { transform: translateX(-40%); opacity: .35; }
  100% { transform: translateX( 40%); opacity: .85; }
}

/* ===================================
   フッター
   =================================== */
footer{
  margin-top:24px;
  border-top:1px solid rgba(255,255,255,.06);
  padding:18px 0 28px;
  color: var(--muted);
}
.footer-inner{ display:flex; align-items:center; justify-content:space-between; gap:14px; flex-wrap:wrap; }
.footer-links{ display:flex; gap:14px; flex-wrap:wrap; }
.copy{ font-size: 12.5px; opacity:.95; }

/* ===================================
   レスポンシブ
   =================================== */
@media (prefers-reduced-motion: reduce){
  *{ animation:none !important; transition:none !important; scroll-behavior:auto !important; }
}