:root{
 --ink:#0d1b2a;--ink-2:#1b2b3f;--text:#14202e;--muted:#5c6b7c;--line:rgba(13,27,42,.08);
 --bg:#f3f6f9;--bg-2:#e9eff5;--card:rgba(255,255,255,.82);--card-solid:#fff;
 --glacier:#4aa3c9;--glacier-d:#1f6f93;--glacier-l:#dff1f8;
 --warm:#e2733b;--warm-l:#fdebe1;--hot:#d6453b;--gold:#e8b23a;
 --r:20px;--r-s:12px;--sh:0 1px 2px rgba(13,27,42,.05),0 8px 28px -10px rgba(13,27,42,.18);
 --sh-h:0 2px 4px rgba(13,27,42,.06),0 18px 40px -14px rgba(13,27,42,.28);
 --jp:"Zen Kaku Gothic New","Hiragino Sans","Noto Sans JP",system-ui,sans-serif;
 --latin:"Cormorant Garamond","Times New Roman",serif;
 --ease:cubic-bezier(.2,.7,.2,1);color-scheme:light dark}
@media (prefers-color-scheme:dark){:root{
 --text:#e7eef5;--muted:#9fb0c2;--line:rgba(255,255,255,.08);--bg:#0a141f;--bg-2:#0f1c2a;
 --card:rgba(22,36,52,.72);--card-solid:#142334;--glacier:#6cc3e6;--glacier-d:#8fd4f0;--glacier-l:rgba(108,195,230,.14);
 --warm:#f0915e;--warm-l:rgba(240,145,94,.14);--hot:#ff7a6e;--sh:0 1px 2px rgba(0,0,0,.3),0 10px 30px -12px rgba(0,0,0,.6);--sh-h:0 18px 44px -14px rgba(0,0,0,.7)}}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:122px;-webkit-text-size-adjust:100%}
body{margin:0;font:400 16px/1.75 var(--jp);color:var(--text);background:var(--bg);letter-spacing:.02em;-webkit-font-smoothing:antialiased;
 background-image:radial-gradient(1200px 600px at 100% 0,var(--glacier-l),transparent 60%),radial-gradient(900px 500px at 0 40%,var(--bg-2),transparent 70%)}
a{color:var(--glacier-d)}
/* hero */
.hero{position:relative;height:min(92svh,820px);min-height:520px;overflow:hidden;color:#fff;isolation:isolate;background:var(--ink)}
.hero-img{position:absolute;inset:-4% 0 -12%;will-change:transform}
.hero-img img{width:100%;height:100%;object-fit:cover;object-position:50% 40%;animation:kb 28s var(--ease) both alternate infinite}
@keyframes kb{from{transform:scale(1.04)}to{transform:scale(1.16) translate3d(-1.5%,1%,0)}}
.hero-scrim{position:absolute;inset:0;background:linear-gradient(180deg,rgba(13,27,42,.35) 0%,rgba(13,27,42,0) 28%,rgba(13,27,42,.15) 50%,rgba(13,27,42,.82) 86%,var(--bg) 100%)}
@media (prefers-color-scheme:dark){.hero-scrim{background:linear-gradient(180deg,rgba(10,20,31,.45),rgba(10,20,31,0) 28%,rgba(10,20,31,.25) 50%,rgba(10,20,31,.9) 88%,var(--bg))}}
.hero-text{position:absolute;left:0;right:0;bottom:56px;padding:0 24px;max-width:1080px;margin:0 auto;animation:rise 1.1s .15s var(--ease) both}
@keyframes rise{from{opacity:0;transform:translateY(18px)}to{opacity:1;transform:none}}
.eyebrow{margin:0 0 6px;font:600 12px/1 var(--jp);letter-spacing:.32em;text-transform:uppercase;opacity:.85}
.hero h1{margin:0;font-weight:500;line-height:.92;text-shadow:0 2px 30px rgba(0,0,0,.35)}
.latin{font-family:var(--latin);display:block;font-size:clamp(3.2rem,15vw,7.5rem);letter-spacing:-.01em}
.latin.year{font-style:italic;font-size:clamp(2.3rem,10vw,5rem);color:#cfeaf6}
.lead{margin:14px 0 0;font-size:1rem;font-weight:500;opacity:.95;letter-spacing:.08em}
.updated{display:inline-flex;align-items:center;gap:8px;margin:14px 0 0;padding:6px 14px;border-radius:99px;font-size:.82rem;background:rgba(255,255,255,.14);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border:1px solid rgba(255,255,255,.22)}
.dot{width:7px;height:7px;border-radius:50%;background:#7ee0a5;box-shadow:0 0 0 4px rgba(126,224,165,.25)}
.scroll-cue{position:absolute;left:50%;bottom:12px;transform:translateX(-50%);color:#fff;opacity:.75;padding:10px;animation:bob 2.4s ease-in-out infinite}
@keyframes bob{50%{transform:translate(-50%,6px)}}
/* sticky bar */
.bar{position:sticky;top:0;z-index:20;background:color-mix(in srgb,var(--bg) 72%,transparent);backdrop-filter:saturate(1.6) blur(18px);-webkit-backdrop-filter:saturate(1.6) blur(18px);border-bottom:1px solid var(--line)}
#nav{display:flex;gap:6px;overflow-x:auto;overscroll-behavior-x:contain;padding:8px 16px 4px;scrollbar-width:none;max-width:1120px;margin:0 auto}
#nav::-webkit-scrollbar,.seg::-webkit-scrollbar{display:none}
#nav a{flex:0 0 auto;display:inline-flex;align-items:center;padding:0 15px;min-height:44px;white-space:nowrap;border-radius:99px;font-size:.88rem;font-weight:500;color:var(--text);text-decoration:none;background:var(--card);border:1px solid var(--line);transition:background .25s,color .25s,transform .2s}
#nav a.on{background:var(--ink);color:#fff;border-color:var(--ink)}
@media (prefers-color-scheme:dark){#nav a.on{background:var(--glacier);color:#06121c;border-color:var(--glacier)}}
#nav a:active{transform:scale(.96)}
.seg-wrap{max-width:1120px;margin:0 auto;padding:4px 16px 10px}
.seg{display:flex;overflow-x:auto;scrollbar-width:none;padding:4px;gap:2px;border-radius:99px;background:var(--bg-2);border:1px solid var(--line);width:max-content;max-width:100%}
.seg button{flex:0 0 auto;font:500 .84rem/1 var(--jp);color:var(--muted);background:none;border:0;border-radius:99px;padding:10px 14px;min-height:44px;cursor:pointer;transition:all .25s var(--ease)}
.seg button[aria-selected=true]{background:var(--card-solid);color:var(--text);box-shadow:0 1px 3px rgba(13,27,42,.15)}
/* layout */
main{max-width:1120px;margin:0 auto;padding:8px 16px 40px}
.sec{padding-top:36px}
.sh{display:flex;gap:14px;align-items:center;margin:0 0 16px}
.si{flex:0 0 auto;width:44px;height:44px;padding:11px;border-radius:14px;fill:none;stroke:var(--glacier-d);stroke-width:1.7;stroke-linejoin:round;stroke-linecap:round;background:var(--glacier-l)}
.sh h2{margin:0;font-size:1.42rem;font-weight:700;letter-spacing:.06em;line-height:1.3}
.sub{margin:2px 0 0;font-size:.8rem;color:var(--muted);display:flex;flex-wrap:wrap;gap:4px 10px;align-items:center}
.freq{font-size:.7rem;padding:1px 8px;border-radius:99px;border:1px solid var(--line);color:var(--muted)}
.h3{margin:26px 0 10px;font-size:.95rem;font-weight:700;letter-spacing:.1em;color:var(--muted);display:flex;align-items:center;gap:10px}
.h3::after{content:"";flex:1;height:1px;background:var(--line)}
.grid{display:grid;gap:14px}
@media (min-width:720px){.grid{grid-template-columns:repeat(2,1fr)}}
@media (min-width:1040px){.grid{grid-template-columns:repeat(3,1fr)}.grid.vids{grid-template-columns:repeat(4,1fr)}}
/* card */
.card{position:relative;background:var(--card);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border:1px solid var(--line);border-radius:var(--r);padding:18px 18px 12px;box-shadow:var(--sh);transition:transform .35s var(--ease),box-shadow .35s var(--ease);display:flex;flex-direction:column}
@media (hover:hover){.card:hover{transform:translateY(-3px);box-shadow:var(--sh-h)}}
.card:active{transform:scale(.99)}
.card.slim{padding:14px 16px}
.card.closed{opacity:.5;filter:grayscale(.9)}
.card.closed:hover{transform:none}
.ch{display:flex;gap:8px;align-items:flex-start;justify-content:space-between}
.ct{min-width:0}
.eb{margin:0 0 2px;font-size:.74rem;font-weight:500;letter-spacing:.08em;color:var(--glacier-d)}
.date{font-weight:700}
.card h4{margin:0;font-size:1.04rem;font-weight:700;line-height:1.5;letter-spacing:.03em}
.card h4 a{color:inherit;text-decoration:none}
.desc{margin:8px 0 0;font-size:.9rem;color:var(--muted);line-height:1.7}
.price{margin:10px 0 0;display:flex;flex-wrap:wrap;align-items:baseline;gap:4px 6px}
.price .lbl{font-size:.72rem;color:var(--muted);padding:1px 7px;border:1px solid var(--line);border-radius:6px;margin-right:2px;align-self:center}
.num{font-family:var(--latin);font-weight:600;font-size:1.9rem;line-height:1;letter-spacing:.01em}
.unit{font-size:.8rem;font-weight:500;margin-right:6px}
.sep{width:1px;height:18px;background:var(--line);margin:0 6px;align-self:center}
.na{font-size:.78rem;font-weight:700;color:var(--hot)}
.price .na:first-child{font-size:.95rem;color:var(--muted)}
.reg{margin:4px 0 0;font-size:.8rem;color:var(--muted)}
.off{margin-left:8px;padding:1px 7px;border-radius:6px;background:var(--glacier-l);color:var(--glacier-d);font-weight:700}
.dl{display:flex;flex-wrap:wrap;gap:6px 10px;align-items:center;margin:12px 0 0}
.dl-l{font-size:.82rem;color:var(--muted)}
.chip{display:inline-flex;align-items:center;gap:5px;padding:4px 11px;border-radius:99px;font-size:.8rem;font-weight:500;background:var(--glacier-l);color:var(--glacier-d)}
.chip svg{width:14px;height:14px}
.chip b{font-family:var(--latin);font-size:1.15rem;line-height:1;font-weight:600}
.chip.warm{background:var(--warm-l);color:var(--warm)}
.chip.hot{background:var(--hot);color:#fff;box-shadow:0 6px 16px -6px var(--hot)}
.chip.done{background:var(--bg-2);color:var(--muted)}
.bdg{display:flex;flex-wrap:wrap;gap:6px;margin-top:10px}
.badge{display:inline-flex;align-items:center;font-size:.7rem;font-weight:700;letter-spacing:.06em;padding:3px 9px;border-radius:6px;margin-left:4px}
.bdg .badge{margin:0}
.badge.check{background:#fff3cc;color:#7a5a00}
.badge.warn{background:var(--warm-l);color:var(--warm);border:1px solid color-mix(in srgb,var(--warm) 35%,transparent)}
.badge.mute{background:var(--bg-2);color:var(--muted)}
@media (prefers-color-scheme:dark){.badge.check{background:rgba(232,178,58,.16);color:var(--gold)}}
.acts{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}
.btn{display:inline-flex;align-items:center;gap:6px;min-height:44px;padding:10px 16px;border-radius:12px;font-size:.88rem;font-weight:500;text-decoration:none;color:#fff;background:var(--ink);transition:transform .2s var(--ease),background .2s}
@media (prefers-color-scheme:dark){.btn{background:var(--glacier);color:#06121c}}
.btn:hover{background:var(--ink-2)}.btn:active{transform:scale(.96)}
.btn.ghost{background:transparent;color:var(--text);border:1px solid color-mix(in srgb,var(--text) 22%,transparent)}
.btn .ext{width:13px;height:13px;opacity:.7}
.pr{font-size:.64rem;font-weight:700;letter-spacing:.08em;padding:1px 5px;border-radius:4px;background:var(--gold);color:#1a1300}
.pending{font-size:.84rem;color:var(--muted);padding:8px 0}
.cf{display:flex;justify-content:space-between;align-items:center;gap:8px;margin-top:auto;padding-top:10px;border-top:1px dashed var(--line);margin-top:14px}
.cf .src{display:inline-flex;align-items:center;min-height:40px;font-size:.82rem;font-weight:500;text-decoration:none}
.cf .src::after{content:"↗";margin-left:4px;font-size:.75rem}
.cf time{font-size:.72rem;color:var(--muted)}
/* star */
.star{flex:0 0 auto;width:44px;height:44px;margin:-8px -8px 0 0;border:0;background:none;cursor:pointer;border-radius:50%;display:grid;place-items:center;-webkit-tap-highlight-color:transparent;transition:background .2s}
.star svg{width:24px;height:24px;fill:none;stroke:var(--muted);stroke-width:1.6;stroke-linejoin:round;transition:fill .25s,stroke .25s,transform .3s var(--ease)}
.star:hover{background:var(--bg-2)}
.star.on svg{fill:var(--gold);stroke:var(--gold)}
.star.pop svg{animation:pop .5s var(--ease)}
@keyframes pop{0%{transform:scale(.6) rotate(-20deg)}55%{transform:scale(1.3) rotate(8deg)}100%{transform:none}}
/* guide */
.kvs{margin:10px 0 0;display:grid;gap:4px}
.kv{display:grid;grid-template-columns:5.2em 1fr;gap:8px;font-size:.86rem}
.kv dt{color:var(--muted)}.kv dd{margin:0}
.blk{margin-top:14px}
.blk h5{margin:0 0 6px;font-size:.76rem;letter-spacing:.14em;color:var(--muted);font-weight:700}
.pt{width:100%;border-collapse:collapse;font-size:.86rem}
.pt tr+tr{border-top:1px solid var(--line)}
.pt th{text-align:left;font-weight:500;padding:6px 0}.pt th small{display:block;color:var(--muted);font-size:.72rem}
.pt td{text-align:right;white-space:nowrap}.pt .num{font-size:1.25rem}
.li{margin:4px 0;font-size:.88rem}
.acc{background:var(--card);border:1px solid var(--line);border-radius:var(--r);margin:0 0 12px;box-shadow:var(--sh);overflow:hidden}
.acc summary{list-style:none;display:flex;align-items:center;gap:10px;padding:16px 18px;min-height:56px;font-weight:700;cursor:pointer;letter-spacing:.06em}
.acc summary::-webkit-details-marker{display:none}
.cnt{font-family:var(--latin);font-size:1.15rem;color:var(--glacier-d);margin-left:auto}
.chev{width:20px;height:20px;color:var(--muted);transition:transform .3s var(--ease)}
.acc[open] .chev{transform:rotate(180deg)}
.acc .body{padding:0 12px 14px}
.acc .card{box-shadow:none;background:var(--card-solid)}
.band{height:180px;margin:44px -16px 0;background:url(assets/band-800.webp) center 60%/cover;position:relative}
@media (min-width:800px){.band{height:300px;background-image:url(assets/band-1600.webp);background-attachment:fixed;border-radius:var(--r);margin:48px 0 0}}
.band::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,var(--bg),transparent 30%,transparent 70%,var(--bg))}
@media (min-width:800px){.band::after{display:none}}
/* fav */
.favblk{margin-bottom:18px}.favblk .grid{margin-top:12px}
.hint{display:flex;gap:14px;align-items:center;padding:18px;border-radius:var(--r);border:1.5px dashed color-mix(in srgb,var(--glacier) 45%,transparent);background:var(--glacier-l)}
.hint .si{background:var(--card-solid);stroke:var(--gold)}
.hint p{margin:0;font-size:.9rem;color:var(--text)}
/* videos */
.vid{padding:10px 10px 14px}
.thumb{position:relative;display:block;border-radius:14px;overflow:hidden;aspect-ratio:16/9;background:var(--bg-2);margin-bottom:10px}
.thumb img{width:100%;height:100%;object-fit:cover;transition:transform .6s var(--ease)}
.vid:hover .thumb img{transform:scale(1.05)}
.play{position:absolute;right:10px;bottom:10px;width:40px;height:40px;border-radius:50%;display:grid;place-items:center;background:rgba(13,27,42,.6);backdrop-filter:blur(6px)}
.play svg{width:18px;height:18px;fill:#fff;margin-left:2px}
.vid .eb,.vid h4,.vid .meta,.vid .desc,.vid .bdg{padding:0 6px}
.vid h4{font-size:.95rem}
.meta{margin:4px 0 0;font-size:.76rem;color:var(--muted)}
.empty,.loading{margin:0;padding:22px;border-radius:var(--r);text-align:center;color:var(--muted);background:var(--card);border:1px dashed var(--line);letter-spacing:.2em}
/* footer */
.site-foot{max-width:1120px;margin:0 auto;padding:28px 20px 48px;border-top:1px solid var(--line);font-size:.78rem;color:var(--muted)}
.site-foot p{margin:6px 0}.disclosure{color:var(--text)}
/* reveal */
.reveal{opacity:0;transform:translateY(14px)}
.reveal.in{opacity:1;transform:none;transition:opacity .6s var(--ease),transform .6s var(--ease),box-shadow .35s var(--ease)}
@media (prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}.reveal{opacity:1;transform:none}}
.num,.chip b,.cnt{font-variant-numeric:lining-nums tabular-nums}
/* privacy page */
.doc{max-width:760px;margin:0 auto;padding:24px 20px 60px}
.doc h1{font-size:1.6rem;letter-spacing:.06em;margin:18px 0 6px}.doc h2{font-size:1.1rem;margin:30px 0 8px;letter-spacing:.06em}
.doc p,.doc li{font-size:.94rem;color:var(--text)}.doc .back{display:inline-flex;min-height:44px;align-items:center;text-decoration:none}
.draft{position:sticky;top:0;z-index:5;background:var(--hot);color:#fff;text-align:center;font-weight:700;padding:10px;letter-spacing:.1em}
.brand{font:700 clamp(2.2rem,11.2vw,7.8rem)/1.05 var(--jp);white-space:nowrap;margin:4px 0 0;letter-spacing:.04em;text-shadow:0 2px 30px rgba(0,0,0,.35)}
.latin-i{font-family:var(--latin);font-style:italic;font-size:1.25em;letter-spacing:.06em;text-transform:none;color:#cfeaf6}
.foot-brand{font-weight:700;font-size:1.05rem;letter-spacing:.12em;color:var(--text)}
.draft-tag{display:inline-block;font-size:.72rem;font-weight:700;letter-spacing:.1em;color:var(--warm);border:1px solid color-mix(in srgb,var(--warm) 45%,transparent);border-radius:6px;padding:2px 8px}
.search-wrap{max-width:1120px;margin:0 auto;padding:18px 16px 0}
.search{display:flex;align-items:center;gap:10px;padding:0 16px;min-height:52px;border-radius:16px;background:var(--card);border:1px solid var(--line);box-shadow:var(--sh)}
.search svg{width:20px;height:20px;color:var(--muted);flex:0 0 auto}
.search input{flex:1;min-width:0;border:0;background:none;font:400 16px var(--jp);color:var(--text);outline:none;padding:14px 0}
.search:focus-within{border-color:var(--glacier)}
.cnt2{margin-left:auto;font-size:.76rem;font-weight:500;color:var(--muted);letter-spacing:.02em;white-space:nowrap}
.hits{margin:0 0 10px;font-size:.84rem;color:var(--muted)}
.mini-h{margin:14px 4px 6px;font-size:.76rem;font-weight:700;letter-spacing:.1em;color:var(--muted)}
.names{list-style:none;margin:0;padding:0 2px;display:flex;flex-wrap:wrap;gap:6px}
.names li{font-size:.84rem;padding:6px 10px;border-radius:10px;background:var(--bg-2);line-height:1.4}
.names li small{margin-left:6px;font-size:.7rem;color:var(--muted)}
.names li a{color:var(--text);text-decoration:none}
.names li.off{opacity:.5;text-decoration:line-through}
.more{grid-column:1/-1;justify-self:center;margin-top:4px}
#nav a.nav-search,#nav a.nav-fav{display:inline-grid;place-items:center;padding:0;width:44px;background:var(--glacier-l);color:var(--glacier-d)}
.search-wrap{scroll-margin-top:130px}

.social a{display:inline-flex;align-items:center;gap:8px;min-height:44px;font-weight:500;color:var(--text);text-decoration:none}.social svg{flex:0 0 auto}

/* nav: favorite chip (icon) / in-group jump links */
#nav a.nav-fav{color:var(--gold)}
#nav a.nav-fav.on{color:var(--gold)}
.sec-cont{padding-top:28px}
.jumps{display:flex;flex-wrap:wrap;gap:6px;margin:-6px 0 14px}
.jumps a{display:inline-flex;align-items:center;min-height:44px;padding:0 14px;border-radius:12px;font-size:.84rem;font-weight:500;text-decoration:none;color:var(--glacier-d);background:var(--glacier-l)}
.jumps a:first-child{background:var(--card-solid);color:var(--text);border:1px solid var(--line)}
.jumps a:first-child::before{content:"●";font-size:.5rem;margin-right:6px;color:var(--glacier)}
/* lessons kind toggle */
.seg.lk{margin:0 0 14px}
.seg button small{margin-left:6px;font-size:.72rem;color:var(--muted);font-variant-numeric:tabular-nums}
.date.tbd{color:var(--muted);font-weight:500}