/* Industrial Algebra - Modern Landing (Top)
   Restored full stylesheet + fixes:
   - fixed header (no band)
   - reliable anchor offset (CSS only)
   - hero overlay darkening with correct stacking (z-index)
   - prevent 1px hero bleed (mask + opaque sections)
 */

:root{
  --bg: #0b1220;
  --panel: rgba(255,255,255,.06);
  --panel2: rgba(255,255,255,.08);
  --text: rgba(255,255,255,.9);
  --muted: rgba(255,255,255,.65);
  --muted2: rgba(255,255,255,.52);
  --border: rgba(148,163,184,.22);
  --shadow: 0 18px 60px rgba(0,0,0,.45);
  --accent1: #7c3aed;
  --accent2: #2563eb;
  --accent3: #06b6d4;
  --good: #22c55e;
  --warn: #f59e0b;
  --radius: 18px;
  --radius2: 26px;
  --maxw: 1160px;
}

/* Light theme overrides */
[data-theme="light"]{
  --bg: #f8fafc;
  --panel: rgba(15,23,42,.05);
  --panel2: rgba(15,23,42,.08);
  --text: rgba(2,6,23,.92);
  --muted: rgba(2,6,23,.62);
  --muted2: rgba(2,6,23,.52);
  --border: rgba(15,23,42,.14);
  --shadow: 0 18px 50px rgba(15,23,42,.12);
}

*{box-sizing:border-box}
html,body{height:100%}

/* Anchor behavior (fixed header offset) */
html{scroll-behavior:smooth; scroll-padding-top:96px;}
:where(section[id]){scroll-margin-top:96px;}

body{
  margin:0;
  color:var(--text);
  background:var(--bg);
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Noto Sans JP", "Hiragino Sans", "Yu Gothic UI", "Yu Gothic", "Meiryo", sans-serif;
  line-height:1.6;
  letter-spacing:.2px;
  /* fixed header space */
  padding-top:84px;
}

a{color:inherit;text-decoration:none}
button, input{font:inherit}
img{max-width:100%;display:block}
svg{display:block}
.container{width:min(var(--maxw), calc(100% - 40px)); margin-inline:auto}

.skiplink{
  position:absolute; left:-999px; top:auto; width:1px; height:1px; overflow:hidden;
}
.skiplink:focus{left:20px; top:12px; width:auto; height:auto; padding:10px 12px; background:var(--panel2); border:1px solid var(--border); border-radius:12px; z-index:9999}

/* Header (fixed, no shadow band) */
.header{
  position:fixed; top:0; left:0; right:0;
  z-index:999;
  background: var(--bg);
  border-bottom: 0;
}
[data-theme="light"] .header{
  border-bottom: 1px solid rgba(15,23,42,.10);
}
.header .row{
  display:flex; align-items:center; justify-content:space-between;
  gap:12px; padding:10px 0;
  flex-wrap:wrap;
}
.brand{display:flex; align-items:center; gap:12px; min-width:240px}
.brand img{width: clamp(200px, 18vw, 240px); height:auto}

.nav{display:flex; align-items:center; gap:14px; flex-wrap:wrap}
.nav a{
  color:var(--muted);
  font-weight:700;
  padding:10px 10px;
  border-radius:12px;
}
.nav a:hover{background:var(--panel); color:var(--text)}

.actions{display:flex; align-items:center; gap:10px}

.btn{
  display:inline-flex; align-items:center; justify-content:center; gap:10px;
  padding:10px 14px;
  border-radius:14px;
  border:1px solid var(--border);
  background:var(--panel);
  color:var(--text);
  font-weight:800;
  cursor:pointer;
  transition: transform .12s ease, background .12s ease, border-color .12s ease;
}
.btn:hover{transform: translateY(-1px); background:var(--panel2)}
.btn.primary{
  border-color: color-mix(in oklab, var(--accent2) 55%, var(--border));
  background: linear-gradient(135deg, color-mix(in oklab, var(--accent1) 60%, transparent), color-mix(in oklab, var(--accent3) 40%, transparent));
  box-shadow: 0 14px 40px rgba(37,99,235,.22);
}
.btn.ghost{background:transparent}
.btn.icon{padding:10px; width:44px}
.btn svg{width:18px; height:18px}

.menuBtn{display:none}

.mobileNav{
  display:none;
  padding:8px 0 18px;
}

/* hidden のときは消す */
.mobileNav[hidden]{
  display:none !important;
}

/* hidden が外れたら表示する */
.mobileNav:not([hidden]){
  display:block;
}

.mobileNav a{
  display:block;
  padding:12px 12px;
  border:1px solid var(--border);
  border-radius:14px;
  background:var(--panel);
  color:var(--text);
  font-weight:800;
}
.mobileNav a + a{margin-top:10px}

/* Hero */
.hero{
  position:relative;
  overflow:hidden;
  z-index:0;
}

/* Background image (bottom layer) */
.heroBg{
  position:absolute; inset:0;
  background: url("/assets/img/hero.jpg") center/cover no-repeat;
  z-index:0;
  opacity: .72; /* dark mode */
}

/* Darkening overlay (must be above heroBg) */
.hero::before{
  content:"";
  position:absolute;
  inset:0;
  z-index:1;
  background: linear-gradient(
    to bottom,
    rgba(0,0,0,.70),
    rgba(0,0,0,.82)
  );
  pointer-events:none;
}

/* Bottom seam mask to prevent 1px bleed */
.hero::after{
  content:"";
  position:absolute;
  left:0; right:0;
  bottom:-2px;
  height:6px;
  background: var(--bg);
  z-index:2;
  pointer-events:none;
}

.hero .content{
  position:relative;
  z-index:3;              /* above overlays */
  padding: 64px 0 56px;   /* balanced after fixed header */
  display:grid;
  grid-template-columns: 1.15fr .85fr;
  gap:34px;
  align-items:center;
}

.hero, .hero *{color:#ffffff}

/* Hero is always "dark": override component colors that were computed from light-mode vars */
.hero .lead{color: rgba(255,255,255,.78) !important;}
.hero .kicker{color: rgba(255,255,255,.82) !important; border-color: rgba(255,255,255,.20) !important; background: rgba(255,255,255,.06) !important;}
.hero .pill{color: rgba(255,255,255,.80) !important; border-color: rgba(255,255,255,.18) !important; background: rgba(255,255,255,.06) !important;}
.hero .pill svg{opacity:.92 !important;}

.hero .heroCard{
  background: rgba(15,23,42,.42) !important;
  border-color: rgba(255,255,255,.16) !important;
}
.hero .heroCardHeader{border-bottom-color: rgba(255,255,255,.14) !important;}
.hero .badge{color: rgba(255,255,255,.70) !important;}
.hero .chip{
  color: rgba(255,255,255,.78) !important;
  border-color: rgba(255,255,255,.18) !important;
  background: rgba(255,255,255,.06) !important;
}
.hero .chip strong{color:#ffffff !important;}

.hero .kv .item{
  background: rgba(255,255,255,.06) !important;
  border-color: rgba(255,255,255,.14) !important;
}
.hero .kv .label{color: rgba(255,255,255,.62) !important;}
.hero .kv .value small{color: rgba(255,255,255,.70) !important;}


.kicker{
  display:inline-flex; align-items:center; gap:10px;
  padding:7px 10px;
  border:1px solid var(--border);
  border-radius:999px;
  background: color-mix(in oklab, var(--panel) 75%, transparent);
  color:var(--muted);
  font-weight:900;
  font-size:12px;
}
.dot{
  width:8px;height:8px;border-radius:99px;
  background: linear-gradient(135deg, var(--accent1), var(--accent3));
  box-shadow: 0 0 0 6px rgba(124,58,237,.10);
}
.h1{
  margin:14px 0 12px;
  font-size: clamp(28px, 3.2vw, 46px);
  line-height:1.12;
  letter-spacing:-.5px;
}
.lead{
  margin:0 0 18px;
  color:var(--muted);
  font-size: clamp(15px, 1.35vw, 18px);
}
.heroCtas{display:flex; gap:10px; flex-wrap:wrap; align-items:center; margin-top:16px}
.metaRow{display:flex; flex-wrap:wrap; gap:10px; margin-top:18px}

.pill{
  display:inline-flex; align-items:center; gap:8px;
  border:1px solid var(--border);
  background: color-mix(in oklab, var(--panel) 65%, transparent);
  padding:8px 10px;
  border-radius:999px;
  color:var(--muted);
  font-weight:900;
  font-size:12px;
}
.pill svg{width:16px;height:16px;opacity:.9}

.heroCard{
  border:1px solid var(--border);
  border-radius: var(--radius2);
  background: color-mix(in oklab, var(--panel) 85%, transparent);
  box-shadow: var(--shadow);
  overflow:hidden;
}
.heroCardHeader{
  padding:16px 16px 10px;
  border-bottom:1px solid var(--border);
  display:flex; align-items:center; justify-content:space-between; gap:12px;
}
.badge{
  font-weight:900;
  font-size:12px;
  letter-spacing:.6px;
  color:color-mix(in oklab, var(--text) 75%, var(--muted));
}
.chip{
  display:inline-flex; align-items:center; gap:8px;
  padding:7px 10px;
  border-radius:999px;
  border:1px solid color-mix(in oklab, var(--border) 80%, transparent);
  background: color-mix(in oklab, var(--panel2) 70%, transparent);
  color:var(--muted);
  font-weight:900;
  font-size:12px;
}
.chip .k{opacity:.85}
.chip strong{color:var(--text)}
.heroCardBody{padding:14px 16px 16px}

.kv{
  display:grid;
  grid-template-columns: 1fr 1fr;
  gap:10px;
}
.kv .item{
  padding:12px;
  border:1px solid var(--border);
  border-radius:16px;
  background: color-mix(in oklab, var(--panel) 65%, transparent);
}
.kv .label{color:var(--muted2); font-weight:900; font-size:12px}
.kv .value{font-weight:950; margin-top:6px; letter-spacing:.2px}
.kv .value small{color:var(--muted); font-weight:900}
.kv .value .ok{color: color-mix(in oklab, var(--good) 75%, var(--text))}
.kv .value .w{color: color-mix(in oklab, var(--warn) 75%, var(--text))}

.section{
  padding:56px 0;
  background: var(--bg);      /* opaque, prevents hero bleed */
  position: relative;
  z-index: 1;
}

.sectionHeader{
  display:flex; align-items:flex-end; justify-content:space-between; gap:14px; margin-bottom:22px;
}
.sectionTitle{
  margin:0;
  font-size: clamp(20px, 2.2vw, 30px);
  letter-spacing:-.3px;
}
.sectionDesc{
  margin:0;
  color:var(--muted);
  font-weight:700;
  max-width: 70ch;
}

.grid3{display:grid; grid-template-columns: repeat(3, 1fr); gap:14px}
.card{
  border:1px solid var(--border);
  border-radius: var(--radius);
  background: color-mix(in oklab, var(--panel) 70%, transparent);
  box-shadow: 0 14px 40px rgba(0,0,0,.14);
  padding:16px;
}
.card h3{margin:0 0 6px; font-size:16px; letter-spacing:-.1px}
.card p{margin:0; color:var(--muted)}
.ico{
  width:42px; height:42px;
  border-radius:16px;
  display:grid; place-items:center;
  border:1px solid color-mix(in oklab, var(--border) 80%, transparent);
  background: linear-gradient(135deg, color-mix(in oklab, var(--accent2) 22%, transparent), color-mix(in oklab, var(--accent3) 16%, transparent));
  margin-bottom:12px;
}
.ico img,.ico svg{width:22px; height:22px; display:block}

.list2{display:grid; grid-template-columns: 1.2fr .8fr; gap:14px; align-items:start}
.panel{
  border:1px solid var(--border);
  border-radius: var(--radius);
  background: color-mix(in oklab, var(--panel) 68%, transparent);
  padding:18px;
}
.ul{margin:10px 0 0; padding:0; list-style:none}
.ul li{
  display:flex; gap:10px;
  padding:10px 0;
  border-top:1px dashed color-mix(in oklab, var(--border) 65%, transparent);
}
.ul li:first-child{border-top:0}
.tick{
  width:22px;height:22px;border-radius:10px;
  display:grid;place-items:center;
  border:1px solid color-mix(in oklab, var(--good) 50%, var(--border));
  background: color-mix(in oklab, var(--good) 12%, transparent);
  flex: 0 0 auto;
  margin-top:1px;
}
.tick svg{width:14px;height:14px}

.split{display:grid; grid-template-columns: 1fr 1fr; gap:14px}
.mini{
  display:flex; justify-content:space-between; gap:10px;
  padding:12px 12px;
  border:1px solid var(--border);
  border-radius:16px;
  background: color-mix(in oklab, var(--panel) 65%, transparent);
}
.mini b{letter-spacing:-.2px}
.mini span{color:var(--muted); font-weight:800}

.logos{display:flex; flex-wrap:wrap; gap:10px; margin-top:12px}
.logoPill{
  border:1px solid var(--border);
  padding:8px 10px;
  border-radius:999px;
  background: color-mix(in oklab, var(--panel) 60%, transparent);
  color:var(--muted);
  font-weight:900;
  font-size:12px;
}

.cta{
  position:relative;
  overflow:hidden;
  border:1px solid var(--border);
  border-radius: var(--radius2);
  background:
  radial-gradient(700px 300px at 10% 30%, rgba(124,58,237,.18), transparent 60%),
  radial-gradient(700px 300px at 90% 70%, rgba(6,182,212,.16), transparent 60%),
  color-mix(in oklab, var(--panel) 70%, transparent);
  box-shadow: var(--shadow);
}
.ctaInner{
  padding:20px;
  display:flex; align-items:center; justify-content:space-between; gap:14px; flex-wrap:wrap;
}
.cta h3{margin:0; font-size:18px}
.cta p{margin:4px 0 0; color:var(--muted); max-width:60ch}

.footer{
  padding:34px 0 46px;
  border-top: 1px solid color-mix(in oklab, var(--border) 70%, transparent);
  color:var(--muted);
}
.footerGrid{
  display:grid;
  grid-template-columns: 1.1fr .9fr .9fr;
  gap:14px;
}
.footer a{color:var(--muted); font-weight:800}
.footer a:hover{color:var(--text)}
.small{font-size:12px; color:var(--muted2); margin-top:12px}
hr.sep{border:0;border-top:1px solid color-mix(in oklab, var(--border) 60%, transparent); margin:14px 0}

.reveal{opacity:0; transform: translateY(10px); transition: opacity .55s ease, transform .55s ease}
.reveal.on{opacity:1; transform:none}

@media (max-width: 820px){
  .hero .content{grid-template-columns: 1fr; padding: 56px 0 42px}
  .grid3{grid-template-columns:1fr}
  .list2{grid-template-columns:1fr}
  .split{grid-template-columns:1fr}
  .nav{display:none}
  .menuBtn{display:inline-flex}
  .footerGrid{grid-template-columns:1fr}
}
.mobileNav{
  display:none;
  padding:8px 0 18px;
}

.mobileNav[hidden]{
  display:none !important;
}

[data-theme="light"] .nav a{color: rgba(2,6,23,.72)}
[data-theme="light"] .nav a:hover{color: rgba(2,6,23,.92)}

.hero .kicker{border-color: rgba(255,255,255,.20); background: rgba(255,255,255,.06); color: rgba(255,255,255,.80)}


/* Hero: mini blocks + generic muted text inside hero */
.hero .mini{border-color: rgba(255,255,255,.14) !important; background: rgba(255,255,255,.06) !important;}
.hero .mini b{color: rgba(255,255,255,.92) !important;}
.hero .mini span{color: rgba(255,255,255,.72) !important;}
.hero .mini{color: rgba(255,255,255,.82) !important;}
.hero .sectionDesc, .hero .label, .hero .muted{color: rgba(255,255,255,.74) !important;}



/* Google Map monochrome tone (professional style) */
.mapMono iframe{
  filter:
  grayscale(80%)
  contrast(92%)
  brightness(96%)
  saturate(60%);
  transition: filter .35s ease;
}
.mapMono:hover iframe{
  filter:none;
}

/* Footer menu spacing */
.footerMenu a{display:block; padding:6px 0; color:var(--muted); font-weight:800}
.footerMenu a:hover{color:var(--text)}


/* =========================
   Lists
   - .ul : UI checklist (tick + flex rows)
   - default ul/ol : document bullets/numbers
   ========================= */

/* Document lists (bullets/numbers) */
main ul:not(.ul),
main ol{
  list-style-position: outside;
  padding-left: 1.4em;
  margin: 1em 0;
}

/* Force list markers to render even if other rules set display:flex */
main ul:not(.ul) > li,
main ol > li{
  display: list-item !important;
  margin: .4em 0;
  line-height: 1.7;
}

/* Nested lists */
main ul:not(.ul) ul{ list-style-type: circle; margin-top: .4em; }
main ul:not(.ul) ul > li{ display:list-item !important; }

/* Keep checklist UI behavior (no markers) */
.ul{
  margin:10px 0 0;
  padding:0;
  list-style:none;
}
.ul li{
  display:flex;
  gap:10px;
  padding:10px 0;
  border-top:1px dashed color-mix(in oklab, var(--border) 65%, transparent);
}
.ul li:first-child{border-top:0}