:root{
  --bg:#000;
  --panel:#0c0c0e;
  --ink:#f5f5f7;
  --muted:#86868b;
  --line:rgba(255,255,255,.10);
  --maxw:1080px;
  --sans:-apple-system,BlinkMacSystemFont,"SF Pro Display","Segoe UI",system-ui,Helvetica,Arial,sans-serif;
  --jp:"Hiragino Sans","Hiragino Kaku Gothic ProN",-apple-system,"Yu Gothic",Meiryo,sans-serif;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:var(--sans);
  background:var(--bg);
  color:var(--ink);
  line-height:1.5;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

/* ---------- type ---------- */
h1,h2,h3{font-weight:600;letter-spacing:-.025em;line-height:1.06}
h1{font-size:clamp(2.6rem,6.4vw,5rem)}
.kicker{color:var(--muted);font-size:clamp(.92rem,1.4vw,1.05rem);font-weight:500;
  letter-spacing:.01em;margin-bottom:20px}
.sub{color:var(--muted);font-size:clamp(1.06rem,1.7vw,1.32rem);font-weight:400;
  max-width:36ch;margin:22px auto 0;line-height:1.5}

/* ---------- nav ---------- */
.nav{
  position:sticky;top:0;z-index:50;
  display:flex;align-items:center;justify-content:space-between;
  padding:16px clamp(20px,5vw,42px);
  border-bottom:1px solid transparent;transition:background .3s,border-color .3s,backdrop-filter .3s;
}
.nav.scrolled{background:rgba(0,0,0,.6);backdrop-filter:saturate(160%) blur(18px);border-bottom-color:var(--line)}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);
  font-weight:600;font-size:1.18rem;letter-spacing:-.01em}
.brand img{border-radius:8px}
.nav-cta{color:var(--ink);text-decoration:none;font-size:.95rem;font-weight:500;
  padding:8px 16px;border:1px solid var(--line);border-radius:980px;transition:background .2s,border-color .2s}
.nav-cta:hover{background:rgba(255,255,255,.08);border-color:rgba(255,255,255,.25)}

/* ---------- sections ---------- */
section{padding:clamp(50px,7.5vw,96px) clamp(20px,5vw,42px)}
.hero,.statement,.review,.band,.final{max-width:var(--maxw);margin:0 auto;text-align:center}

/* ---------- hero ---------- */
.hero{padding-top:clamp(50px,8vw,96px)}
.hero .sub{max-width:none;margin-bottom:32px}
.cta{display:flex;flex-direction:column;align-items:center;gap:14px}
.appbtn{display:inline-flex;align-items:center;gap:9px;background:#fff;color:#000;
  text-decoration:none;font-weight:500;font-size:1.04rem;padding:13px 26px;border-radius:980px;
  transition:transform .2s,background .2s}
.appbtn:hover{background:#e6e6e9;transform:translateY(-1px)}
.appbtn svg{display:block}

.hero-stage{position:relative;margin-top:clamp(34px,5vw,60px);display:flex;justify-content:center}
.spotlight{position:absolute;top:-8%;left:50%;transform:translateX(-50%);
  width:min(760px,120%);aspect-ratio:1;border-radius:50%;z-index:0;
  background:radial-gradient(circle,rgba(255,255,255,.12),rgba(255,255,255,.03) 38%,transparent 62%);
  filter:blur(8px);pointer-events:none}

/* ---------- device frame ---------- */
.device{
  position:relative;z-index:1;width:min(300px,72vw);
  border-radius:42px;padding:9px;background:#1a1a1c;
  box-shadow:0 1px 0 rgba(255,255,255,.14) inset,0 50px 120px -40px rgba(0,0,0,.9),
    0 0 0 1px rgba(0,0,0,.6);
}
.device-lg{width:min(330px,80vw)}
.device video{display:block;width:100%;border-radius:34px;background:#000}

/* ---------- statement ---------- */
.statement h2{font-size:clamp(1.9rem,4.2vw,3.2rem);max-width:18ch;margin:0 auto;
  color:var(--ink)}
.statement .sub,.review .sub{margin-left:auto;margin-right:auto}

/* ---------- features ---------- */
.features{max-width:var(--maxw);margin:0 auto;display:grid;
  grid-template-columns:repeat(3,1fr);gap:clamp(28px,5vw,64px);
  border-top:1px solid var(--line);padding-top:clamp(44px,6vw,72px)}
.feat h3{font-size:1.35rem;margin-bottom:12px;font-weight:600}
.feat p{color:var(--muted);font-size:1.02rem;line-height:1.5}

/* ---------- review ---------- */
.review h2{font-size:clamp(2rem,4.4vw,3.2rem)}
.review .sub{margin-bottom:8px}

/* ---------- band (no AI) ---------- */
.band{border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.band h2{font-size:clamp(1.9rem,4vw,3rem);margin-bottom:18px}
.band p{color:var(--muted);font-size:clamp(1.05rem,1.6vw,1.25rem);max-width:46ch;margin:0 auto}

/* ---------- final ---------- */
.final h2{font-size:clamp(2.4rem,5.5vw,4rem);margin-bottom:34px}
.final .cta{margin-bottom:16px}
.fineprint{color:var(--muted);font-size:.95rem}

/* ---------- footer ---------- */
.footer{max-width:var(--maxw);margin:0 auto;border-top:1px solid var(--line);
  padding:34px clamp(20px,5vw,42px);display:flex;align-items:center;gap:24px;
  font-size:.9rem;color:var(--muted)}
.footer>span:first-child{color:var(--ink);font-weight:600}
.footer nav{display:flex;gap:22px;margin-left:auto}
.footer a{color:var(--muted);text-decoration:none;transition:color .2s}
.footer a:hover{color:var(--ink)}

/* ---------- reveal ---------- */
.reveal-ready .reveal{opacity:0;transform:translateY(20px);
  transition:opacity .8s cubic-bezier(.16,.8,.3,1),transform .8s cubic-bezier(.16,.8,.3,1)}
.reveal-ready .reveal.is-visible{opacity:1;transform:none}
.d1{transition-delay:.08s}.d2{transition-delay:.16s}.d3{transition-delay:.24s}
@media(prefers-reduced-motion:reduce){.reveal{opacity:1!important;transform:none!important}}

/* ---------- responsive ---------- */
@media(max-width:760px){
  .features{grid-template-columns:1fr;gap:40px;text-align:center}
  .footer{flex-wrap:wrap;gap:14px}
  .footer nav{margin-left:0;width:100%;order:3}
}

/* ---------- library ---------- */
.library{max-width:var(--maxw);margin:0 auto;text-align:center}
.lib-head{max-width:640px;margin:0 auto clamp(30px,4vw,48px)}
.posters{display:flex;flex-wrap:wrap;justify-content:center;gap:clamp(12px,1.5vw,18px)}
.poster{width:clamp(108px,13.5vw,150px);aspect-ratio:2/3;object-fit:cover;
  border-radius:14px;border:1px solid var(--line);background:#111;
  filter:brightness(.82) saturate(.96);
  transition:transform .35s cubic-bezier(.16,.8,.3,1),filter .35s,box-shadow .35s;
  cursor:pointer;will-change:transform}
.poster:hover{transform:translateY(-8px) scale(1.04);filter:brightness(1.08) saturate(1.06);
  box-shadow:0 26px 52px -16px rgba(0,0,0,.85),0 0 0 1px rgba(255,255,255,.2)}
.posters:hover .poster:not(:hover){filter:brightness(.5) saturate(.85)}
@media(prefers-reduced-motion:reduce){.poster{transition:filter .3s}.poster:hover{transform:none}}

/* ---------- word pages (SEO) ---------- */
.word{max-width:760px;margin:0 auto;padding:clamp(36px,6vw,72px) clamp(20px,5vw,42px)}
.crumb{margin-bottom:30px}
.crumb a{color:var(--muted);text-decoration:none;font-size:.95rem}
.crumb a:hover{color:var(--ink)}
.word-hero{text-align:center;padding-bottom:clamp(34px,5vw,52px);border-bottom:1px solid var(--line);margin-bottom:clamp(36px,6vw,54px)}
.word-hero h1{font-size:clamp(2.2rem,5vw,3.4rem)}
.jlpt{display:inline-block;font-size:.78rem;font-weight:600;color:var(--muted);border:1px solid var(--line);border-radius:999px;padding:4px 13px;margin-bottom:22px}
.kanji{font-family:var(--jp);font-size:clamp(4rem,15vw,6.5rem);line-height:1.05;font-weight:700}
.kanji ruby rt{font-size:.24em;color:var(--muted);font-weight:500}
.word-romaji{color:var(--muted);font-size:1.18rem;margin-top:14px;letter-spacing:.02em}
.word-meaning{font-size:clamp(1.35rem,3vw,1.9rem);font-weight:600;margin-top:12px}
.word-block{margin-bottom:clamp(40px,6vw,60px)}
.word-block h2{font-size:1.35rem;margin-bottom:18px;font-weight:600}
.examples{list-style:none;display:flex;flex-direction:column;gap:10px}
.examples li{display:flex;justify-content:space-between;gap:20px;align-items:center;padding:14px 18px;background:var(--panel);border:1px solid var(--line);border-radius:12px}
.ex-jp{font-family:var(--jp);font-size:1.15rem}
.ex-g{color:var(--muted);text-align:right}
.scenes{display:flex;flex-direction:column;gap:14px}
.scene{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:20px 22px}
.scene-jp{font-family:var(--jp);font-size:1.38rem;line-height:2;margin-bottom:10px}
.scene-jp ruby rt{font-size:.5em;color:var(--muted);font-weight:400}
.scene-en{color:var(--muted);font-style:italic}
.scene figcaption{margin-top:10px;font-size:.78rem;color:var(--muted);text-transform:uppercase;letter-spacing:.09em}
.word-cta{text-align:center;border-top:1px solid var(--line);padding-top:clamp(38px,6vw,52px)}
.word-cta h2{font-size:clamp(1.5rem,3.4vw,2.1rem);margin-bottom:14px}
.word-cta p{color:var(--muted);max-width:46ch;margin:0 auto 24px}
.word-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(148px,1fr));gap:13px;margin-bottom:clamp(48px,8vw,76px)}
.word-card{display:flex;flex-direction:column;align-items:center;text-align:center;gap:11px;
  padding:26px 18px;background:var(--panel);border:1px solid var(--line);border-radius:18px;
  text-decoration:none;transition:transform .25s,border-color .25s,background .25s}
.word-card:hover{transform:translateY(-5px);border-color:rgba(255,255,255,.26);background:#141416}
.wc-jlpt{font-size:.66rem;font-weight:700;letter-spacing:.05em;padding:3px 10px;
  border-radius:999px;border:1px solid transparent;color:var(--muted)}
.wc-kanji{font-family:var(--jp);font-size:2.15rem;font-weight:700;color:var(--ink);line-height:1.1}
.wc-mean{color:var(--muted);font-size:.92rem;line-height:1.35}

/* JLPT level colors (match app: N5 green, N4 teal, N3 blue, N2 orange, N1 red) */
.jlpt.n5,.wc-jlpt.n5{color:#30d158;background:rgba(48,209,88,.15);border-color:rgba(48,209,88,.32)}
.jlpt.n4,.wc-jlpt.n4{color:#40c8e0;background:rgba(64,200,224,.15);border-color:rgba(64,200,224,.32)}
.jlpt.n3,.wc-jlpt.n3{color:#0a84ff;background:rgba(10,132,255,.16);border-color:rgba(10,132,255,.34)}
.jlpt.n2,.wc-jlpt.n2{color:#ff9f0a;background:rgba(255,159,10,.15);border-color:rgba(255,159,10,.32)}
.jlpt.n1,.wc-jlpt.n1{color:#ff453a;background:rgba(255,69,58,.15);border-color:rgba(255,69,58,.32)}

/* nav: right-side links */
.nav-right{display:flex;align-items:center;gap:22px}
.nav-link{color:var(--muted);text-decoration:none;font-size:.95rem;font-weight:500;transition:color .2s}
.nav-link:hover{color:var(--ink)}

/* word-page scene clips */
.scene-clip{border-radius:12px;overflow:hidden;margin-bottom:14px;background:#000;aspect-ratio:16/9}
.scene-clip video{display:block;width:100%;height:100%;object-fit:cover}

/* target word highlight + romaji + example furigana */
.tw{color:#8b5cf6;font-weight:600}
.scene-jp .tw rt,.tw rt{color:#a78bfa}
.scene-romaji{color:#7c8398;font-size:.95rem;font-style:italic;margin-top:5px}
.ex-text{display:flex;flex-direction:column;gap:2px}
.ex-jp ruby rt{font-size:.5em;color:var(--muted);font-weight:400}
.ex-romaji{color:#7c8398;font-size:.82rem;font-style:italic}