:root{
  color-scheme:light;
  --bg:#f7f1e8;
  --paper:#fffaf2;
  --card:#ffffff;
  --ink:#2e3a33;
  --ink2:#4c5a51;
  --muted:#5f6d63;
  --line:#e7dccb;
  --accent:#a44e3e;
  --accent-dark:#863b30;
  --accent-soft:#f5e4de;
  --sage:#69806e;
  --sage-soft:#e9efe6;
  --shadow:0 20px 55px rgba(77,59,40,.1);
  --serif:"Songti SC","STSong","Noto Serif CJK SC",serif;
  --sans:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans CJK SC",sans-serif;
}

body[data-topic="typing"]{
  --accent:#4f6c88;
  --accent-dark:#3e5870;
  --accent-soft:#e6edf4;
  --sage:#6c7f91;
  --sage-soft:#eaf0f4;
}

body[data-topic="conjugation"]{
  --accent:#6d5b82;
  --accent-dark:#58466c;
  --accent-soft:#eee8f3;
  --sage:#777086;
  --sage-soft:#efebf3;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;text-size-adjust:100%}
body{
  margin:0;
  min-width:320px;
  background:
    radial-gradient(circle at 90% 8%,rgba(201,106,82,.09),transparent 24rem),
    radial-gradient(circle at 5% 42%,rgba(105,128,110,.08),transparent 28rem),
    var(--bg);
  color:var(--ink);
  font-family:var(--sans);
  font-size:16px;
  line-height:1.75;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit}
button,a{-webkit-tap-highlight-color:transparent}
img{max-width:100%}
.wrap{width:min(1120px,calc(100% - 40px));margin-inline:auto}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.skip-link{position:absolute;left:16px;top:-80px;z-index:100;padding:10px 14px;border-radius:10px;background:var(--ink);color:#fff;text-decoration:none}
.skip-link:focus{top:16px}

.site-header{
  position:sticky;top:0;z-index:20;
  border-bottom:1px solid rgba(231,220,203,.82);
  background:rgba(247,241,232,.9);
  backdrop-filter:blur(18px);
  -webkit-backdrop-filter:blur(18px);
}
.site-header__inner{min-height:72px;display:flex;align-items:center;gap:26px}
.brand{display:inline-flex;align-items:center;gap:10px;flex:none;text-decoration:none;font-family:var(--serif);font-size:21px;font-weight:700;letter-spacing:.02em}
.brand__mark{width:38px;height:38px;border-radius:11px;border:1px solid var(--line);background:var(--paper)}
.site-nav{display:flex;align-items:center;gap:4px;margin-left:auto}
.site-nav a{padding:7px 11px;border-radius:999px;color:var(--muted);font-size:13.5px;text-decoration:none;white-space:nowrap}
.site-nav a:hover,.site-nav a[aria-current="page"]{background:var(--accent-soft);color:var(--accent-dark)}
.header-cta{flex:none;min-height:38px;display:inline-flex;align-items:center;justify-content:center;padding:0 16px;border-radius:999px;background:var(--accent);color:#fff;font-size:13.5px;font-weight:650;text-decoration:none;box-shadow:0 7px 18px rgba(164,78,62,.2)}

.topic-hero{padding:70px 0 64px}
.topic-hero__grid{display:grid;grid-template-columns:minmax(0,1.06fr) minmax(340px,.94fr);gap:60px;align-items:center}
.breadcrumb{display:flex;align-items:center;gap:8px;margin-bottom:25px;color:var(--muted);font-size:12.5px}
.breadcrumb a{text-decoration:none}
.breadcrumb a:hover{color:var(--accent)}
.eyebrow{margin:0 0 14px;color:var(--accent);font-size:12px;font-weight:750;letter-spacing:.13em;text-transform:uppercase}
h1,h2,h3{font-family:var(--serif);line-height:1.28;letter-spacing:-.015em}
h1{max-width:710px;margin:0;font-size:clamp(38px,5.1vw,66px);font-weight:700;text-wrap:balance}
.kana-h1{font-size:clamp(36px,4.6vw,60px)}
.nowrap{display:inline-block}
.lead{max-width:680px;margin:24px 0 0;color:var(--muted);font-size:18px;line-height:1.85}
.hero-actions{display:flex;align-items:center;gap:18px;flex-wrap:wrap;margin-top:31px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:48px;padding:0 21px;border-radius:999px;text-decoration:none;font-size:15px;font-weight:650;transition:transform .15s ease,box-shadow .15s ease,background .15s ease}
.btn:hover{transform:translateY(-1px)}
.btn--primary{background:var(--accent);color:#fff;box-shadow:0 10px 24px rgba(164,78,62,.23)}
.btn--primary:hover{background:var(--accent-dark)}
.btn--outline{border:1px solid var(--line);background:rgba(255,255,255,.68);color:var(--ink2)}
.btn .icon{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.text-link{display:inline-flex;align-items:center;gap:6px;color:var(--muted);font-size:14px;text-underline-offset:4px}
.text-link:hover{color:var(--accent)}
.hero-stats{display:flex;gap:12px;flex-wrap:wrap;margin:31px 0 0;padding:0;list-style:none}
.hero-stats li{min-width:104px;padding:10px 14px;border:1px solid var(--line);border-radius:14px;background:rgba(255,250,242,.7);color:var(--muted);font-size:11.5px}
.hero-stats b{display:block;margin-bottom:1px;color:var(--ink);font-family:var(--serif);font-size:18px}

.topic-visual{position:relative;min-height:400px;display:grid;place-items:center}
.topic-visual::before{content:"";position:absolute;width:330px;height:330px;border-radius:50%;background:var(--accent-soft);opacity:.75;transform:translate(35px,-12px)}
.topic-visual::after{content:"";position:absolute;right:18px;bottom:22px;width:130px;height:130px;border:1px solid rgba(164,78,62,.18);border-radius:50%}
.art-card{position:relative;z-index:1;width:min(100%,396px);padding:25px;border:1px solid var(--line);border-radius:28px;background:var(--paper);box-shadow:var(--shadow)}
.art-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:18px;color:var(--muted);font-size:11.5px;letter-spacing:.08em}
.art-top b{color:var(--ink);font-family:var(--serif);font-size:18px;letter-spacing:.02em}
.kana-art-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:8px}
.kana-art-grid span{aspect-ratio:1;display:grid;place-items:center;border-radius:12px;background:#fff;border:1px solid #efe6d8;font-family:"Hiragino Sans","Yu Gothic",sans-serif;font-size:24px;color:var(--ink2)}
.kana-art-grid span:nth-child(3n){background:var(--accent-soft);color:var(--accent-dark)}
.art-caption{margin-top:18px;color:var(--muted);font-size:11.5px;line-height:1.7}

.typing-stage{display:grid;gap:14px}
.romaji-row,.kana-row{display:flex;align-items:center;justify-content:center;gap:7px;flex-wrap:wrap}
.key{min-width:34px;height:37px;display:grid;place-items:center;padding:0 8px;border-radius:8px;border:1px solid #e4e8ec;background:#fff;box-shadow:0 2px 0 #e6e1d8;font:600 13px/1 var(--sans);color:var(--muted)}
.key.is-hot{background:var(--accent-soft);border-color:transparent;color:var(--accent-dark)}
.typing-arrow{text-align:center;color:var(--sage);font-size:20px;line-height:1}
.kana-result{text-align:center;font-family:"Hiragino Sans","Yu Gothic",sans-serif;font-size:38px;font-weight:600;letter-spacing:.08em;color:var(--ink)}
.kanji-result{margin-top:-7px;text-align:center;color:var(--accent);font-family:var(--serif);font-size:15px}
.typing-keys{display:grid;grid-template-columns:repeat(8,1fr);gap:6px;margin-top:9px;padding-top:17px;border-top:1px solid #eee4d7}
.typing-keys span{height:30px;display:grid;place-items:center;border-radius:6px;background:#f5f0e7;color:#6f7c73;font-size:10.5px}

.conj-card{padding:28px 26px}
.conj-word{font-family:"Hiragino Mincho ProN","Yu Mincho",serif;font-size:45px;line-height:1.2;color:var(--ink)}
.conj-small{display:block;margin-top:4px;color:var(--muted);font-size:12px}
.conj-rows{display:grid;gap:9px;margin-top:22px}
.conj-form{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:11px 13px;border-radius:12px;background:#fff;border:1px solid #efe6d8}
.conj-form span{color:var(--muted);font-size:12px}
.conj-form b{font-family:"Hiragino Sans","Yu Gothic",sans-serif;font-size:18px;font-weight:500;color:var(--ink2)}
.conj-form.is-accent{background:var(--accent-soft);border-color:transparent}
.conj-form.is-accent b{color:var(--accent-dark)}
.conj-note{margin-top:17px;padding-top:15px;border-top:1px solid #eee4d7;color:var(--muted);font-size:11.5px}

.section{padding:66px 0;border-top:1px solid var(--line)}
.section--tint{background:rgba(255,250,242,.55)}
.section-head{display:grid;grid-template-columns:minmax(0,.82fr) minmax(0,1.18fr);gap:54px;align-items:start;margin-bottom:34px}
.section-kicker{margin:0 0 8px;color:var(--accent);font-size:11.5px;font-weight:750;letter-spacing:.11em}
.section h2{margin:0;font-size:clamp(29px,3.5vw,43px);font-weight:700}
.section-intro{margin:6px 0 0;color:var(--muted);font-size:16.5px;line-height:1.9}
.card-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
.card{padding:23px 21px;border:1px solid var(--line);border-radius:19px;background:var(--card);box-shadow:0 8px 24px rgba(77,59,40,.035)}
.card__num{display:grid;place-items:center;width:31px;height:31px;margin-bottom:17px;border-radius:10px;background:var(--accent-soft);color:var(--accent);font-family:var(--serif);font-size:13px;font-weight:700}
.card h3{margin:0 0 8px;font-size:19px}
.card p{margin:0;color:var(--muted);font-size:14px;line-height:1.8}
.card small{display:block;margin-top:12px;color:var(--ink2);font-size:11.5px}

.steps{display:grid;gap:0;margin:0;padding:0;list-style:none;counter-reset:step}
.steps li{position:relative;display:grid;grid-template-columns:40px minmax(0,1fr);gap:17px;padding:0 0 26px;counter-increment:step}
.steps li:last-child{padding-bottom:0}
.steps li::before{content:counter(step,decimal-leading-zero);width:38px;height:38px;display:grid;place-items:center;border-radius:50%;background:var(--accent-soft);color:var(--accent-dark);font-family:var(--serif);font-size:12px;font-weight:700}
.steps li::after{content:"";position:absolute;left:19px;top:44px;bottom:5px;width:1px;background:var(--line)}
.steps li:last-child::after{display:none}
.steps h3{margin:3px 0 5px;font-size:18px}
.steps p{margin:0;color:var(--muted);font-size:14px;line-height:1.8}
.example{display:inline-block;margin-top:8px;padding:4px 9px;border-radius:7px;background:var(--sage-soft);color:#4f6653;font-size:12px}

.split{display:grid;grid-template-columns:minmax(0,.92fr) minmax(0,1.08fr);gap:44px;align-items:start}
.copy p{margin:0 0 15px;color:var(--muted);font-size:15.5px;line-height:1.95}
.copy p:last-child{margin-bottom:0}
.copy strong{color:var(--ink)}
.callout{margin-top:22px;padding:18px 19px;border-left:3px solid var(--accent);border-radius:0 13px 13px 0;background:var(--accent-soft);color:var(--ink2);font-size:14px;line-height:1.85}
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:17px;background:var(--card)}
table{width:100%;border-collapse:collapse;font-size:14px;white-space:nowrap}
th,td{padding:13px 16px;border-bottom:1px solid #efe8dc;text-align:left}
th{background:#fbf7f0;color:var(--ink2);font-size:12px;font-weight:700;letter-spacing:.02em}
tr:last-child td{border-bottom:0}
td:first-child{color:var(--muted)}
td strong{font-family:"Hiragino Sans","Yu Gothic",sans-serif;color:var(--ink);font-weight:600}

.faq{display:grid;gap:10px;margin-top:30px}
.faq details{padding:0 18px;border:1px solid var(--line);border-radius:14px;background:rgba(255,255,255,.78)}
.faq summary{cursor:pointer;padding:16px 26px 16px 0;position:relative;list-style:none;font-family:var(--serif);font-size:16px;font-weight:700}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";position:absolute;right:0;top:12px;color:var(--accent);font-family:var(--sans);font-size:21px;font-weight:400}
.faq details[open] summary::after{content:"−"}
.faq p{margin:0;padding:0 0 17px;color:var(--muted);font-size:14px;line-height:1.85}

.cta-panel{position:relative;overflow:hidden;padding:46px 48px;border-radius:26px;background:var(--ink);color:#fff}
.cta-panel::after{content:"";position:absolute;width:330px;height:330px;right:-70px;top:-145px;border-radius:50%;background:var(--accent);opacity:.18}
.cta-panel__inner{position:relative;z-index:1;display:flex;align-items:center;justify-content:space-between;gap:30px}
.cta-panel h2{max-width:700px;margin:0;color:#fff;font-size:clamp(27px,3.2vw,39px)}
.cta-panel p{max-width:650px;margin:11px 0 0;color:rgba(255,255,255,.68);font-size:14px}
.cta-panel .btn{flex:none;background:#fff;color:var(--ink);box-shadow:none}

.site-footer{padding:36px 0 44px;border-top:1px solid var(--line);color:var(--muted);font-size:12.5px}
.site-footer__inner{display:flex;align-items:flex-start;justify-content:space-between;gap:24px}
.site-footer b{font-family:var(--serif);color:var(--ink);font-size:14px}
.site-footer p{margin:4px 0 0}
.footer-links{display:flex;flex-wrap:wrap;gap:13px}
.footer-links a{text-decoration:none}
.footer-links a:hover{color:var(--accent)}

@media (max-width:900px){
  .topic-hero{padding:48px 0 44px}
  .topic-hero__grid{grid-template-columns:1fr;gap:38px}
  .topic-visual{min-height:330px}
  .section-head,.split{grid-template-columns:1fr;gap:20px}
  .card-grid{grid-template-columns:1fr 1fr}
  .cta-panel__inner{align-items:flex-start;flex-direction:column}
}

@media (max-width:680px){
  .wrap{width:min(100% - 28px,1120px)}
  .site-header__inner{min-height:62px;gap:12px}
  .brand{font-size:19px}
  .brand__mark{width:33px;height:33px}
  .site-nav{max-width:100%;overflow-x:auto;margin-left:0;order:3;padding-bottom:4px}
  .site-header__inner{flex-wrap:wrap;padding:9px 0 6px}
  .header-cta{margin-left:auto;min-height:34px;padding:0 13px}
  .topic-hero__grid{gap:30px}
  h1{font-size:38px}
  .lead{font-size:16px}
  .hero-stats li{flex:1;min-width:92px}
  .topic-visual{min-height:300px}
  .art-card{padding:20px;border-radius:22px}
  .kana-art-grid span{font-size:20px;border-radius:9px}
  .typing-keys{grid-template-columns:repeat(4,1fr)}
  .section{padding:48px 0}
  .card-grid{grid-template-columns:1fr}
  .cta-panel{padding:31px 24px;border-radius:20px}
  .site-footer__inner{flex-direction:column}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .btn{transition:none}
}