:root{
  --ink:#2b2f3a; --sub:#8a90a0;
  --green:#22b573; --green-soft:#d8f6e6; --green-line:#bdeed4;
  --blue:#3f7ff5; --blue-soft:#e2ecff;
  --orange:#ff9a3d; --orange-soft:#ffedd8;
  --pink:#ff6f9c; --pink-soft:#ffe3ec;
  --purple:#9b7bf0; --purple-soft:#eee5ff;
  --yellow:#f4c94b; --yellow-soft:#fff4d6; --yellow-ink:#a37a00;
  --teal:#22b5a8; --teal-soft:#d6f5f1;
  --bg:#fbfbfd; --card:#ffffff; --line:#edeef4; --r:20px; --r-lg:26px;
}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:"Hiragino Maru Gothic ProN","Hiragino Kaku Gothic ProN","Noto Sans JP",-apple-system,BlinkMacSystemFont,sans-serif;
  color:var(--ink);background:var(--bg);line-height:1.75;-webkit-font-smoothing:antialiased;overflow-x:hidden}
a{color:inherit}
.wrap{max-width:800px;margin:0 auto;padding:0 20px}
img{max-width:100%;display:block}
svg{display:block}
header.site{background:rgba(255,255,255,.9);backdrop-filter:blur(6px);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:30}
header.site .wrap{display:flex;align-items:center;justify-content:space-between;height:64px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none}
.brand img{height:38px;width:auto;border-radius:6px}
.nav{display:flex;gap:6px;font-size:13.5px;font-weight:700}
.nav a{text-decoration:none;color:var(--sub);padding:8px 14px;border-radius:999px;transition:.15s}
.nav a:hover{background:var(--green-soft);color:var(--green)}
.nav a.on{background:var(--green);color:#fff}
.hero{position:relative;padding:30px 0 26px;background:transparent}
.hero .wrap{position:relative}
.crumbs{display:flex;gap:6px;align-items:center;flex-wrap:wrap;margin-bottom:14px}
.crumb-pill{font-size:12.5px;font-weight:700;color:var(--sub);text-decoration:none;background:#fff;border:1px solid var(--line);border-radius:999px;padding:5px 12px}
.crumb-pill:hover{color:var(--green);border-color:var(--green-line)}
.crumb-sep{color:#d3d6e0;font-size:12px}
.subject-badge{display:inline-flex;align-items:center;gap:7px;font-size:12.5px;font-weight:800;border-radius:999px;padding:6px 14px;margin-bottom:14px}
.subject-badge svg{width:15px;height:15px}
h1{font-size:32px;font-weight:800;letter-spacing:.01em}
.lead{margin-top:10px;color:var(--sub);font-size:15px;max-width:58ch;font-weight:600}
section.block{padding:24px 0}
h2{font-size:19px;font-weight:800;display:flex;align-items:center;gap:10px;margin-bottom:16px}
.h2-icon{width:32px;height:32px;border-radius:11px;display:grid;place-items:center;flex:none}
.h2-icon svg{width:18px;height:18px}
.sub-note{font-size:12.5px;color:var(--sub);margin:-6px 0 14px;font-weight:600}
.feature{background:var(--card);border:1px solid var(--line);border-radius:var(--r-lg);overflow:hidden;box-shadow:0 14px 34px rgba(60,60,110,.08)}
.feature .video{position:relative;padding-top:56.25%;background:#000}
.feature .video iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.feature .fbar{display:flex;align-items:center;justify-content:space-between;gap:14px;padding:18px 20px;flex-wrap:wrap}
.feature .ftitle{font-weight:800;font-size:16px}
.feature .ftitle small{display:block;font-weight:700;color:var(--sub);font-size:12px;margin-top:3px}
.btn-pdf{display:inline-flex;align-items:center;gap:8px;background:var(--green);color:#fff;text-decoration:none;border-radius:999px;padding:13px 22px;font-weight:800;font-size:14.5px;white-space:nowrap;box-shadow:0 10px 22px rgba(34,181,115,.30);border:none;cursor:pointer;font-family:inherit}
.btn-pdf svg{width:17px;height:17px}
.btn-pdf:hover{background:#1a9c62}
.btn-pdf.ghost{background:#fff;color:var(--green);border:1.5px solid var(--green-line);box-shadow:none;padding:9px 15px;font-size:12.5px}
.btn-pdf.ghost svg{width:15px;height:15px}
.btn-pdf.ghost:hover{background:var(--green-soft)}
.filters{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:16px}
.chip{font-size:13px;font-weight:800;border-radius:999px;padding:9px 18px;cursor:pointer;user-select:none;transition:.12s;-webkit-tap-highlight-color:transparent}
.chip.all{background:#eef0f4;color:var(--ink)}
.chip.lesson{background:var(--blue-soft);color:var(--blue)}
.chip.exam{background:var(--pink-soft);color:var(--pink)}
.chip.drill{background:var(--yellow-soft);color:var(--yellow-ink)}
.chip:hover{filter:brightness(.97)}
.chip.active.all{background:var(--ink);color:#fff}
.chip.active.lesson{background:var(--blue);color:#fff}
.chip.active.exam{background:var(--pink);color:#fff}
.chip.active.drill{background:var(--yellow-ink);color:#fff}
.mats{display:grid;gap:12px}
.mat{display:flex;gap:14px;align-items:center;background:var(--card);border:1px solid var(--line);border-radius:18px;padding:12px 14px;transition:.15s}
.mat:hover{border-color:var(--green-line);box-shadow:0 10px 22px rgba(60,60,110,.07);transform:translateY(-1px)}
.mat .thumb{width:112px;flex:none;aspect-ratio:16/10;border-radius:12px;overflow:hidden;position:relative;background:var(--blue-soft);text-decoration:none;display:block}
.mat .thumb img{width:100%;height:100%;object-fit:cover}
.mat .thumb .play{position:absolute;inset:0;display:grid;place-items:center}
.mat .thumb .play span{width:32px;height:32px;border-radius:50%;background:rgba(30,32,44,.55);display:grid;place-items:center}
.mat .thumb .play svg{width:14px;height:14px}
.mat .body{flex:1;min-width:0}
.mat .body .t{font-weight:800;font-size:14.5px}
.mat .body .tags{margin-top:5px;display:flex;gap:6px;flex-wrap:wrap}
.tg{font-size:10.5px;font-weight:800;border-radius:999px;padding:3px 10px}
.tg.lesson{background:var(--blue-soft);color:var(--blue)}
.tg.exam{background:var(--pink-soft);color:var(--pink)}
.tg.drill{background:var(--yellow-soft);color:var(--yellow-ink)}
.tg.matome{background:var(--green-soft);color:var(--green)}
.demo{background:var(--card);border:1px solid var(--line);border-radius:var(--r-lg);overflow:hidden;box-shadow:0 14px 34px rgba(60,60,110,.06)}
.demo .tag{display:inline-flex;align-items:center;gap:6px;font-size:12.5px;font-weight:700;color:var(--purple);background:var(--purple-soft);margin:14px 0 0 18px;padding:6px 12px;border-radius:999px}
.demo .tag svg{width:14px;height:14px}
.demo .stage{background:linear-gradient(180deg,#fdfcff,#f5f3fd);margin-top:12px}
canvas{display:block;width:100%}
.demo .panel{display:flex;flex-wrap:wrap;gap:16px 24px;align-items:center;padding:16px 20px;border-top:1px solid var(--line)}
.ctrl{display:flex;flex-direction:column;gap:5px;min-width:150px;flex:1}
.ctrl label{font-size:12.5px;color:var(--sub);font-weight:700;display:flex;justify-content:space-between}
.ctrl label b{color:var(--purple);font-variant-numeric:tabular-nums}
input[type=range]{width:100%;accent-color:var(--purple)}
.btn-play{display:inline-flex;align-items:center;gap:6px;background:var(--purple);color:#fff;border:0;border-radius:999px;padding:11px 20px;font-family:inherit;font-weight:800;cursor:pointer;font-size:13.5px;box-shadow:0 8px 18px rgba(155,123,240,.3)}
.btn-play svg{width:13px;height:13px}
.btn-play:hover{background:#8362e6}
.demo-note{font-size:12px;color:var(--sub);margin-top:10px;font-weight:600}
.demo-note b{color:var(--purple)}
.prep{background:var(--card);border:1.5px dashed #e2e4ee;border-radius:var(--r-lg);padding:30px 20px;text-align:center;color:var(--sub);font-weight:700;font-size:13.5px}
.prep .pico{width:46px;height:46px;border-radius:14px;background:var(--purple-soft);color:var(--purple);display:grid;place-items:center;margin:0 auto 10px}
.prep .pico svg{width:24px;height:24px}
.related{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.related a{background:var(--card);border:1.5px solid var(--line);border-radius:18px;padding:18px 10px;text-decoration:none;text-align:center;transition:.15s}
.related a:hover{border-color:var(--green-line);transform:translateY(-2px);box-shadow:0 10px 22px rgba(60,60,110,.07)}
.related .k{display:block;font-size:10.5px;color:var(--sub);font-weight:700;margin-bottom:8px}
.related .icon-tile{width:44px;height:44px;border-radius:13px;margin:0 auto 8px;display:grid;place-items:center;background:var(--green-soft);color:var(--green)}
.related .icon-tile svg{width:23px;height:23px}
.related .name{font-weight:800;font-size:14px}
.hub-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.hub-tile{background:var(--card);border:1.5px solid var(--line);border-radius:22px;padding:24px 14px;text-decoration:none;text-align:center;transition:.15s;position:relative}
.hub-tile:hover{transform:translateY(-3px);box-shadow:0 14px 28px rgba(60,60,110,.09)}
.hub-tile .tile-ico{width:56px;height:56px;border-radius:17px;display:grid;place-items:center;margin:0 auto 10px}
.hub-tile .tile-ico svg{width:29px;height:29px}
.hub-tile .tname{font-weight:800;font-size:16px}
.hub-tile .tdesc{font-size:11.5px;color:var(--sub);font-weight:600;margin-top:3px}
.hub-tile.soon{opacity:.62}
.hub-tile .soon-badge{position:absolute;top:10px;right:10px;font-size:10px;font-weight:800;color:var(--sub);background:var(--line);border-radius:999px;padding:2px 9px}
.unit-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
.unit-card{display:flex;align-items:center;gap:12px;background:var(--card);border:1px solid var(--line);border-radius:16px;padding:14px 16px;text-decoration:none;transition:.15s}
.unit-card:hover{border-color:var(--green-line);transform:translateY(-1px);box-shadow:0 10px 20px rgba(60,60,110,.06)}
.unit-card .uico{width:40px;height:40px;border-radius:12px;flex:none;display:grid;place-items:center;background:var(--blue-soft);color:var(--blue)}
.unit-card .uico svg{width:21px;height:21px}
.unit-card .uname{font-weight:800;font-size:15px}
.unit-card .ucount{font-size:11.5px;color:var(--sub);font-weight:600;margin-top:2px}
.about{border:1px solid var(--line);border-radius:16px;overflow:hidden;background:var(--card)}
.arow{display:flex;gap:12px;padding:15px 18px;border-bottom:1px solid var(--line);font-size:14px}
.arow:last-child{border-bottom:none}
.arow .ak{width:130px;flex:none;color:var(--sub);font-weight:700}
.arow .av{font-weight:700}
footer.site{padding:30px 0 60px;text-align:center}
footer.site .fchip{display:inline-flex;align-items:center;gap:9px;background:#fff;border:1px solid var(--line);border-radius:999px;padding:10px 18px;font-size:12.5px;color:var(--sub);font-weight:700}
footer.site .fchip img{height:22px;border-radius:4px}
footer.site a.yt{color:var(--green);text-decoration:none}
.page{position:relative}
.bg{position:absolute;inset:0;z-index:0;pointer-events:none;overflow:hidden}
.bg svg{position:absolute}
.hero,main.wrap,footer.site{position:relative;z-index:1}
@media(max-width:640px){
  h1{font-size:26px}
  .related{grid-template-columns:1fr}
  .hub-grid{grid-template-columns:repeat(2,1fr)}
  .unit-grid{grid-template-columns:1fr}
  .mat{flex-wrap:wrap}
  .mat .thumb{width:96px}
  .nav a:not(.on){display:none}
}