:root{
  --ink:#1f2420;
  --ink-soft:#5a6358;
  --paper:#faf8f3;
  --paper-alt:#f1ede2;
  --line:#e4ddc9;
  --accent:#c0392b;      /* 朱色 torii red */
  --accent-dark:#9c2d20;
  --accent-soft:#f6e3df;
  --indigo:#2c4a52;      /* 藍 */
  --indigo-soft:#e4edee;
  --gold:#c8963e;
  --ok:#2f8f5b;
  --radius:16px;
  --shadow:0 10px 30px -14px rgba(31,36,32,.25);
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  font-family:"Noto Sans JP","Zen Maru Gothic",system-ui,-apple-system,sans-serif;
  background:var(--paper);
  color:var(--ink);
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:inherit}
.wrap{max-width:1120px;margin:0 auto;padding:0 24px}

/* ---- personalization badge ---- */
.rt-badge{
  background:var(--ink);color:#fff;
  font-size:12px;letter-spacing:.02em;white-space:nowrap;
  padding:8px 14px;border-radius:999px;
  display:flex;align-items:center;gap:7px;flex:none;
}
.rt-badge .dot{width:7px;height:7px;border-radius:50%;background:#8fd4a8;flex:none}
.rt-badge .txt{display:inline}

/* ---- nav ---- */
.topnav{
  position:sticky;top:0;z-index:50;
  background:rgba(250,248,243,.92);backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line);
}
.topnav .inner{display:flex;align-items:center;justify-content:space-between;gap:16px;height:64px;flex-wrap:nowrap}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:19px;letter-spacing:.01em;text-decoration:none;flex:none}
.brand .mark{
  width:34px;height:34px;border-radius:10px;background:var(--accent);
  color:#fff;display:flex;align-items:center;justify-content:center;
  font-size:17px;font-weight:800;box-shadow:0 4px 10px -4px rgba(192,57,43,.6);flex:none;
}
.nav-right{display:flex;align-items:center;gap:14px;min-width:0}
.navlinks{display:flex;gap:4px;align-items:center;overflow-x:auto;scrollbar-width:none;min-width:0}
.navlinks::-webkit-scrollbar{display:none}
.navlinks a{
  font-size:14.5px;font-weight:600;color:var(--ink-soft);white-space:nowrap;
  padding:9px 14px;border-radius:999px;text-decoration:none;transition:.15s;
}
.navlinks a:hover,.navlinks a.active{background:var(--ink);color:#fff}
.navlinks a.active{background:var(--accent)}

@media(max-width:860px){
  .navlinks a{padding:8px 11px;font-size:13.5px}
  .rt-badge .txt{display:none}
  .rt-badge{padding:8px 10px}
}
@media(max-width:620px){
  .navlinks{display:none}
}

/* ---- buttons ---- */
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:13px 24px;border-radius:999px;font-weight:700;font-size:15px;
  text-decoration:none;border:none;cursor:pointer;transition:.15s;
}
.btn-primary{background:var(--accent);color:#fff;box-shadow:0 10px 24px -10px rgba(192,57,43,.65)}
.btn-primary:hover{background:var(--accent-dark);transform:translateY(-1px)}
.btn-dark{background:var(--ink);color:#fff}
.btn-dark:hover{background:#000}
.btn-ghost{background:#fff;color:var(--ink);border:1px solid var(--line)}
.btn-ghost:hover{border-color:var(--ink)}
.btn-lg{padding:16px 30px;font-size:16.5px}
.btn:disabled{opacity:.45;cursor:not-allowed}

/* ---- hero ---- */
.hero{position:relative;overflow:hidden;color:#fff}
.hero-bg{position:absolute;inset:0;background-size:cover;background-position:center}
.hero-scrim{position:absolute;inset:0;background:linear-gradient(180deg,rgba(20,20,18,.35),rgba(15,18,16,.78) 70%,rgba(15,18,16,.92))}
.hero-inner{position:relative;padding:150px 24px 90px;max-width:1120px;margin:0 auto}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.3);
  padding:7px 16px;border-radius:999px;font-size:13px;font-weight:600;letter-spacing:.03em;
  margin-bottom:22px;backdrop-filter:blur(4px);
}
.hero h1{font-size:clamp(34px,5.2vw,58px);line-height:1.18;margin:0 0 20px;font-weight:800;letter-spacing:-.01em}
.hero h1 .accent{color:#ffb199}
.hero p.lead{font-size:18px;line-height:1.75;color:rgba(255,255,255,.88);max-width:620px;margin:0 0 34px}
.hero-ctas{display:flex;gap:14px;flex-wrap:wrap}

/* ---- sections ---- */
section{padding:84px 0}
.section-head{max-width:640px;margin:0 0 48px}
.kicker{color:var(--accent);font-weight:700;font-size:13.5px;letter-spacing:.08em;text-transform:uppercase;margin-bottom:10px;display:block}
.section-head h2{font-size:clamp(26px,3.4vw,38px);margin:0 0 14px;line-height:1.25;font-weight:800}
.section-head p{color:var(--ink-soft);font-size:16.5px;line-height:1.8;margin:0}
.alt{background:var(--paper-alt)}

/* ---- feature grid ---- */
.grid{display:grid;gap:22px}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-2{grid-template-columns:repeat(2,1fr)}
@media(max-width:860px){.grid-3,.grid-2{grid-template-columns:1fr}}

.card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:28px;box-shadow:var(--shadow);
}
.feature-card .icon{
  width:50px;height:50px;border-radius:13px;background:var(--indigo-soft);color:var(--indigo);
  display:flex;align-items:center;justify-content:center;margin-bottom:18px;
}
.feature-card h3{margin:0 0 10px;font-size:18.5px;font-weight:700}
.feature-card p{margin:0;color:var(--ink-soft);font-size:14.8px;line-height:1.75}

/* ---- photo feature row ---- */
.photo-row{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center}
@media(max-width:860px){.photo-row{grid-template-columns:1fr}}
.photo-row img{border-radius:20px;box-shadow:var(--shadow)}
.photo-row.reverse .text{order:2}
.photo-row.reverse .photo{order:1}
.tagline{font-weight:700;color:var(--accent);font-size:13.5px;letter-spacing:.06em;text-transform:uppercase;margin-bottom:12px;display:block}
.photo-row h3{font-size:26px;margin:0 0 14px;font-weight:800;line-height:1.3}
.photo-row p{color:var(--ink-soft);line-height:1.85;font-size:16px;margin:0 0 18px}
.checklist{list-style:none;padding:0;margin:0}
.checklist li{display:flex;gap:10px;align-items:flex-start;margin-bottom:10px;font-size:15px;color:var(--ink)}
.checklist li svg{flex:none;color:var(--ok);margin-top:2px}

/* ---- footer CTA ---- */
.cta-band{
  background:var(--ink);color:#fff;border-radius:24px;padding:60px 40px;text-align:center;
  background-image:linear-gradient(135deg,rgba(192,57,43,.25),rgba(44,74,82,.5)),url("../images/tokyo-night.jpg");
  background-size:cover;background-position:center;
}
.cta-band h2{font-size:clamp(24px,3.2vw,34px);margin:0 0 14px;font-weight:800}
.cta-band p{color:rgba(255,255,255,.82);margin:0 0 28px;font-size:16px}

footer{border-top:1px solid var(--line);padding:36px 0;color:var(--ink-soft);font-size:13.5px}
footer .wrap{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:10px}

/* ---- app shell (dashboard & activities) ---- */
.app-shell{min-height:100vh;background:var(--paper-alt)}
.app-header{
  background:var(--ink);color:#fff;padding:36px 0 70px;position:relative;overflow:hidden;
}
.app-header::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(120deg,rgba(192,57,43,.35),transparent 55%);
}
.app-header .wrap{position:relative}
.app-header-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:28px}
.greet h1{font-size:25px;margin:0 0 6px;font-weight:800}
.greet p{margin:0;color:rgba(255,255,255,.72);font-size:14.5px}
.streak{
  display:flex;align-items:center;gap:8px;background:rgba(255,255,255,.12);
  border:1px solid rgba(255,255,255,.2);padding:8px 16px;border-radius:999px;font-size:14px;font-weight:700;
}
.avatar{
  width:42px;height:42px;border-radius:50%;background:var(--accent);
  display:flex;align-items:center;justify-content:center;font-weight:800;color:#fff;font-size:15px;
}

.app-main{margin-top:-46px;padding-bottom:70px}

.progress-card{
  background:#fff;border-radius:20px;padding:26px 28px;box-shadow:var(--shadow);
  display:grid;grid-template-columns:auto 1fr auto;gap:28px;align-items:center;margin-bottom:28px;
}
@media(max-width:700px){.progress-card{grid-template-columns:1fr;text-align:center}}
.ring{position:relative;width:92px;height:92px}
.ring svg{transform:rotate(-90deg)}
.ring .pct{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:18px}
.progress-mid h3{margin:0 0 6px;font-size:16.5px}
.progress-mid p{margin:0;color:var(--ink-soft);font-size:14px}
.progress-bar{height:8px;background:var(--paper-alt);border-radius:999px;overflow:hidden;margin-top:12px}
.progress-bar>span{display:block;height:100%;background:linear-gradient(90deg,var(--accent),var(--gold));border-radius:999px}

.lesson-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin-top:10px}
@media(max-width:980px){.lesson-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:560px){.lesson-grid{grid-template-columns:1fr}}

.lesson-card{
  background:#fff;border-radius:18px;padding:24px;box-shadow:var(--shadow);
  border:1px solid var(--line);text-decoration:none;color:var(--ink);
  display:flex;flex-direction:column;gap:14px;transition:.15s;position:relative;
}
.lesson-card:hover{transform:translateY(-3px);box-shadow:0 16px 34px -16px rgba(31,36,32,.35)}
.lesson-card .licon{
  width:46px;height:46px;border-radius:12px;display:flex;align-items:center;justify-content:center;
}
.lesson-card h4{margin:0;font-size:16px;font-weight:700}
.lesson-card p{margin:0;font-size:13.3px;color:var(--ink-soft);line-height:1.6}
.lesson-card .badge{
  position:absolute;top:18px;right:18px;font-size:11px;font-weight:700;
  padding:4px 10px;border-radius:999px;
}
.badge-done{background:#e3f4ea;color:var(--ok)}
.badge-new{background:var(--accent-soft);color:var(--accent-dark)}
.badge-locked{background:#eee;color:#999}

.icon-red{background:var(--accent-soft);color:var(--accent)}
.icon-indigo{background:var(--indigo-soft);color:var(--indigo)}
.icon-gold{background:#f8edd8;color:var(--gold)}
.icon-green{background:#e3f4ea;color:var(--ok)}

/* ---- activity shell ---- */
.activity-top{display:flex;align-items:center;justify-content:space-between;gap:18px;margin-bottom:30px;flex-wrap:wrap}
.back-link{display:flex;align-items:center;gap:6px;color:var(--ink-soft);text-decoration:none;font-weight:600;font-size:14px}
.back-link:hover{color:var(--ink)}
.activity-score{
  background:#fff;border:1px solid var(--line);border-radius:999px;padding:8px 18px;
  font-weight:700;font-size:14px;display:flex;align-items:center;gap:8px;box-shadow:var(--shadow);
}
.activity-box{
  background:#fff;border-radius:22px;box-shadow:var(--shadow);padding:44px;max-width:720px;margin:0 auto;
}
@media(max-width:640px){.activity-box{padding:28px 20px}}

/* flashcards */
.card-counter{text-align:center;color:var(--ink-soft);font-size:13.5px;font-weight:600;margin-bottom:18px}
.flip-stage{perspective:1400px;margin:0 auto 26px;max-width:420px}
.flip-card{position:relative;width:100%;height:280px;cursor:pointer}
.flip-card .face{
  position:absolute;inset:0;border-radius:18px;backface-visibility:hidden;
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  transition:transform .5s cubic-bezier(.4,.2,.2,1);text-align:center;padding:20px;
}
.flip-card .front{background:var(--indigo-soft);border:1px solid #d9e6e8}
.flip-card .back{background:var(--accent-soft);transform:rotateY(180deg);border:1px solid #f0d6d1}
.flip-card.flipped .front{transform:rotateY(180deg)}
.flip-card.flipped .back{transform:rotateY(360deg)}
.kanji-big{font-size:64px;font-weight:800;margin-bottom:10px}
.kana{font-size:20px;color:var(--ink-soft);margin-bottom:4px}
.romaji{font-size:14px;color:var(--ink-soft);letter-spacing:.04em}
.meaning-big{font-size:26px;font-weight:800;margin-bottom:8px}
.hint-tap{font-size:12.5px;color:var(--ink-soft);margin-top:10px}
.flip-nav{display:flex;justify-content:center;gap:14px}
.iconbtn{
  width:52px;height:52px;border-radius:50%;background:#fff;border:1px solid var(--line);
  display:flex;align-items:center;justify-content:center;cursor:pointer;box-shadow:var(--shadow);transition:.15s;
}
.iconbtn:hover{border-color:var(--ink)}
.iconbtn.primary{background:var(--accent);color:#fff;border:none}

/* quiz */
.quiz-tabs{display:flex;gap:8px;justify-content:center;margin-bottom:30px}
.quiz-tab{
  padding:9px 18px;border-radius:999px;font-size:13.5px;font-weight:700;cursor:pointer;
  border:1px solid var(--line);background:#fff;color:var(--ink-soft);
}
.quiz-tab.active{background:var(--ink);color:#fff;border-color:var(--ink)}
.q-prompt{text-align:center;margin-bottom:30px}
.q-prompt .label{font-size:13px;font-weight:700;color:var(--accent);text-transform:uppercase;letter-spacing:.06em;margin-bottom:12px;display:block}
.q-prompt .big{font-size:40px;font-weight:800}
.speak-btn{
  width:78px;height:78px;border-radius:50%;background:var(--indigo);color:#fff;border:none;
  display:flex;align-items:center;justify-content:center;margin:0 auto 14px;cursor:pointer;box-shadow:0 10px 26px -10px rgba(44,74,82,.6);
  transition:.15s;
}
.speak-btn:hover{transform:scale(1.05)}
.speak-btn.playing{animation:pulse 1s infinite}
@keyframes pulse{0%{box-shadow:0 0 0 0 rgba(44,74,82,.45)}70%{box-shadow:0 0 0 18px rgba(44,74,82,0)}100%{box-shadow:0 0 0 0 rgba(44,74,82,0)}}
.opt-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
@media(max-width:520px){.opt-grid{grid-template-columns:1fr}}
.opt-card{
  border:2px solid var(--line);background:#fff;border-radius:16px;padding:20px;
  display:flex;flex-direction:column;align-items:center;gap:10px;cursor:pointer;transition:.15s;
}
.opt-card:hover{border-color:var(--indigo)}
.opt-card .oicon{width:54px;height:54px;border-radius:14px;display:flex;align-items:center;justify-content:center}
.opt-card span.lbl{font-weight:700;font-size:14.5px}
.opt-card.correct{border-color:var(--ok);background:#eefbf2}
.opt-card.wrong{border-color:var(--accent);background:var(--accent-soft)}
.opt-card:disabled{cursor:default}
.feedback{text-align:center;margin-top:20px;font-weight:700;min-height:26px}
.feedback.ok{color:var(--ok)}
.feedback.bad{color:var(--accent)}

/* matching */
.match-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px;margin-bottom:10px}
@media(max-width:600px){.match-grid{grid-template-columns:1fr}}
.match-col h4{font-size:13px;text-transform:uppercase;letter-spacing:.05em;color:var(--ink-soft);margin:0 0 14px;text-align:center}
.match-item{
  border:2px solid var(--line);border-radius:14px;padding:16px;margin-bottom:12px;text-align:center;
  cursor:pointer;background:#fff;font-weight:700;font-size:16px;transition:.15s;
}
.match-item.selected{border-color:var(--indigo);background:var(--indigo-soft)}
.match-item.matched{border-color:var(--ok);background:#eefbf2;opacity:.6;cursor:default}
.match-item .oicon{width:40px;height:40px;border-radius:10px;margin:0 auto 8px;display:flex;align-items:center;justify-content:center}

/* pronunciation */
.record-stage{text-align:center}
.target-word{font-size:46px;font-weight:800;margin-bottom:6px}
.target-sub{color:var(--ink-soft);margin-bottom:34px;font-size:15px}
.mic-btn{
  width:110px;height:110px;border-radius:50%;background:var(--accent);color:#fff;border:none;
  display:flex;align-items:center;justify-content:center;margin:0 auto 18px;cursor:pointer;
  box-shadow:0 14px 30px -10px rgba(192,57,43,.6);transition:.15s;
}
.mic-btn.recording{background:#7a1f16;animation:pulse2 1.1s infinite}
@keyframes pulse2{0%{box-shadow:0 0 0 0 rgba(192,57,43,.5)}70%{box-shadow:0 0 0 22px rgba(192,57,43,0)}100%{box-shadow:0 0 0 0 rgba(192,57,43,0)}}
.rec-status{font-size:14px;font-weight:700;color:var(--ink-soft);margin-bottom:26px;min-height:20px}
.wave{display:flex;align-items:flex-end;gap:4px;height:48px;justify-content:center;margin-bottom:26px}
.wave span{width:5px;background:var(--indigo);border-radius:3px;height:8px;transition:height .1s}
.playback-row{display:flex;gap:12px;justify-content:center;align-items:center}
audio{width:260px}
.word-nav{display:flex;justify-content:center;gap:10px;margin-top:30px}
.worddot{width:9px;height:9px;border-radius:50%;background:var(--line)}
.worddot.active{background:var(--accent);width:22px;border-radius:5px}

.toast{
  position:fixed;bottom:26px;left:50%;transform:translateX(-50%) translateY(20px);
  background:var(--ink);color:#fff;padding:13px 22px;border-radius:12px;font-size:14px;font-weight:600;
  box-shadow:var(--shadow);opacity:0;pointer-events:none;transition:.25s;z-index:80;display:flex;align-items:center;gap:8px;
}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}