:root{
  --navy:#0055A1; --navy-d:#003B73; --cyan:#00AEE6; --cyan-d:#0088B8;
  --tint:#EEF7FC; --tint2:#F6FAFD; --line:#D5E6F2;
  --ink:#1B2533; --sub:#4E5B6B; --ok:#0B7A5C; --ok-t:#E7F6F1; --ng:#C8102E; --ng-t:#FDEEF0;
  --accent:#F39800;
  --font:"Hiragino Sans","Hiragino Kaku Gothic ProN","Yu Gothic UI","Yu Gothic","Meiryo",sans-serif;
  --radius:16px; --hdr:68px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:calc(var(--hdr) + 12px)}
body{font-family:var(--font);color:var(--ink);background:#fff;line-height:1.75;font-size:16px;-webkit-text-size-adjust:100%}
img{max-width:100%;height:auto;display:block}
a{color:var(--navy)}
button{font:inherit;cursor:pointer}
[hidden]{display:none!important}
.wrap{width:min(1160px,100% - 32px);margin-inline:auto}
.wrap.narrow{width:min(860px,100% - 32px)}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:2px solid transparent;border-radius:999px;padding:12px 26px;font-weight:700;text-decoration:none;line-height:1.3;transition:background .15s,color .15s,border-color .15s,transform .1s;cursor:pointer;text-align:center}
.btn:active{transform:translateY(1px)}
.btn-primary{background:var(--navy);color:#fff}
.btn-primary:hover{background:var(--navy-d)}
.btn-ghost{background:#fff;color:var(--navy);border-color:var(--navy)}
.btn-ghost:hover{background:var(--tint)}
.btn-accent{background:var(--accent);color:#fff}
.btn-accent:hover{background:#D98700}
.btn-white{background:#fff;color:var(--navy)}
.btn-white:hover{background:var(--tint)}
.btn-sm{padding:8px 18px;font-size:14px}
.btn-lg{padding:16px 36px;font-size:17px}
.btn:focus-visible,a:focus-visible,input:focus-visible,.choice input:focus-visible+span{outline:3px solid var(--cyan);outline-offset:2px}

/* header */
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.96);backdrop-filter:saturate(1.4) blur(8px);border-bottom:1px solid var(--line)}
.hdr{height:var(--hdr);display:flex;align-items:center;justify-content:space-between;gap:16px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);min-width:0}
.brand-mark{width:34px;height:34px;border-radius:10px;background:linear-gradient(135deg,var(--navy),var(--cyan));flex:none;position:relative}
.brand-mark:after{content:"";position:absolute;inset:9px;border:3px solid #fff;border-radius:50%}
.brand-text{display:flex;flex-direction:column;line-height:1.25;min-width:0}
.brand-text b{font-size:16px;color:var(--navy);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.brand-text small{font-size:11px;color:var(--sub)}
.gnav{display:flex;align-items:center;gap:22px}
.gnav a:not(.btn){color:var(--ink);text-decoration:none;font-size:15px;font-weight:600}
.gnav a:not(.btn):hover{color:var(--navy)}
.menu-btn{display:none;width:44px;height:44px;border:0;background:none;flex-direction:column;justify-content:center;align-items:center;gap:5px;flex:none}
.menu-btn span{display:block;width:24px;height:2px;background:var(--navy);border-radius:2px;transition:transform .2s,opacity .2s}
.menu-btn[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.menu-btn[aria-expanded="true"] span:nth-child(2){opacity:0}
.menu-btn[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* hero */
.hero{background:linear-gradient(160deg,#F2FAFE 0%,#E3F2FB 60%,#D6ECF9 100%);overflow:hidden}
.hero-in{display:grid;grid-template-columns:1.05fr 1fr;gap:48px;align-items:center;padding:64px 0 72px}
.kicker{display:inline-block;font-size:14px;font-weight:700;color:var(--cyan-d);letter-spacing:.06em;margin-bottom:12px}
.hero h1{font-size:clamp(30px,4.2vw,46px);line-height:1.3;color:var(--navy);font-weight:800;margin-bottom:18px}
.lead{color:var(--sub);font-size:16px;margin-bottom:24px}
.steps{list-style:none;display:flex;flex-wrap:wrap;gap:10px;margin-bottom:28px}
.steps li{display:flex;align-items:center;gap:8px;background:#fff;border:1px solid var(--line);border-radius:999px;padding:6px 16px 6px 6px;font-size:14px;font-weight:700}
.steps li span{width:26px;height:26px;border-radius:50%;background:var(--navy);color:#fff;display:grid;place-items:center;font-size:13px}
.hero-cta{display:flex;flex-wrap:wrap;gap:12px}
.hero-visual{position:relative}
.hero-in>*,.player-layout>*,.cur-grid>*,.dl-list>*{min-width:0}
.hero-visual img{border-radius:14px;box-shadow:0 24px 50px rgba(0,60,120,.22)}
.hero-badge{position:absolute;top:-14px;right:-10px;background:var(--ok);color:#fff;font-weight:800;padding:8px 18px;border-radius:999px;box-shadow:0 6px 16px rgba(0,0,0,.18)}

/* sections */
.sec{padding:80px 0}
.sec-tint{background:var(--tint2)}
.sec-head{margin-bottom:34px}
.sec-en{font-size:13px;font-weight:800;letter-spacing:.14em;color:var(--cyan-d)}
.sec-head h2{font-size:clamp(24px,3vw,32px);color:var(--navy);line-height:1.35;margin-top:4px}
.sec-head h2:after{content:"";display:block;width:56px;height:4px;border-radius:2px;background:var(--cyan);margin-top:14px}
.sec-lead{color:var(--sub);margin-top:16px}

/* player */
.player-layout{display:grid;grid-template-columns:1fr;gap:28px}
.player-layout.has-list{grid-template-columns:1fr 320px}
.player{position:relative;aspect-ratio:16/9;border-radius:14px;overflow:hidden;background:#0A1E33;box-shadow:0 14px 34px rgba(0,40,90,.18)}
.player video{position:absolute;inset:0;width:100%;height:100%;background:#000;display:block}
.chapters{margin-top:18px;background:var(--tint2);border:1px solid var(--line);border-radius:var(--radius);padding:16px 18px}
.chapters-h{font-weight:800;color:var(--navy);font-size:14px;margin-bottom:10px}
.chapters ol{list-style:none;display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:8px}
.chapters button{width:100%;text-align:left;border:1px solid var(--line);background:#fff;border-radius:10px;padding:8px 12px;font-size:14px;line-height:1.5;color:var(--ink);display:flex;gap:10px;align-items:baseline}
.chapters button b{color:var(--cyan-d);flex:none;font-variant-numeric:tabular-nums}
.chapters button:hover{border-color:#9CCBE8}
.chapters button[aria-current="true"]{border-color:var(--navy);background:var(--tint);font-weight:700}
.player-facade{position:absolute;inset:0;border:0;padding:0;background:#000;cursor:pointer;display:block;width:100%}
.player-facade img{width:100%;height:100%;object-fit:cover;opacity:.92;transition:opacity .2s}
.player-facade:hover img{opacity:1}
.play-ico{position:absolute;left:50%;top:50%;width:88px;height:62px;transform:translate(-50%,-50%);background:rgba(200,16,46,.95);border-radius:18px;display:grid;place-items:center;box-shadow:0 8px 24px rgba(0,0,0,.35)}
.play-ico:after{content:"";border-left:24px solid #fff;border-top:15px solid transparent;border-bottom:15px solid transparent;margin-left:6px}
.player-empty{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;color:#fff;text-align:center;padding:20px}
.player-empty img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:.18;filter:blur(6px)}
.player-empty b{position:relative;font-size:22px}
.player-empty span{position:relative;font-size:14px;color:#CFE6F5}
.player-title{font-size:20px;color:var(--navy);margin-top:18px;line-height:1.45}
.player-note{color:var(--sub);font-size:14px;margin-top:4px}
.playlist{background:var(--tint2);border:1px solid var(--line);border-radius:var(--radius);padding:18px;align-self:start}
.playlist-h{font-weight:800;color:var(--navy);margin-bottom:10px}
.playlist ol{list-style:none;display:flex;flex-direction:column;gap:8px}
.playlist button{width:100%;text-align:left;border:1px solid var(--line);background:#fff;border-radius:10px;padding:10px 12px;font-size:14px;line-height:1.5;color:var(--ink);display:flex;gap:10px}
.playlist button b{color:var(--cyan-d);flex:none}
.playlist button[aria-current="true"]{border-color:var(--navy);background:var(--tint);font-weight:700}

/* curriculum */
.cur-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.cur-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;display:flex;flex-direction:column}
.cur-card img{aspect-ratio:16/9;object-fit:cover;border-bottom:1px solid var(--line)}
.cur-body{padding:14px 16px 18px}
.cur-no{display:inline-block;font-size:12px;font-weight:800;color:#fff;background:var(--navy);border-radius:6px;padding:1px 8px;margin-bottom:6px}
.cur-card.ex .cur-no{background:var(--cyan-d)}
.cur-body h3{font-size:16px;line-height:1.45;color:var(--ink);margin-bottom:4px}
.cur-body p{font-size:13px;color:var(--sub);line-height:1.6}

/* downloads */
.dl-list{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.dl-item{display:flex;gap:18px;align-items:flex-start;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px}
.dl-ico{flex:none;width:52px;height:64px;border-radius:6px;background:var(--ng);color:#fff;font-weight:800;font-size:13px;display:grid;place-items:end center;padding-bottom:10px;position:relative}
.dl-ico:before{content:"";position:absolute;top:0;right:0;border-left:14px solid #E9798A;border-bottom:14px solid #E9798A;border-top:14px solid #fff;border-right:14px solid #fff}
.dl-body{flex:1;min-width:0}
.dl-body h3{font-size:17px;line-height:1.45;color:var(--ink)}
.dl-body p{font-size:14px;color:var(--sub);margin:6px 0 14px}
.dl-body .size{font-size:12px;color:var(--sub);margin-left:10px}

/* quiz */
.quiz-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:32px;text-align:center}
.quiz-meta{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-bottom:22px}
.quiz-meta div{background:var(--tint);border-radius:12px;padding:14px 8px}
.quiz-meta dt{font-size:13px;color:var(--sub)}
.quiz-meta dd{font-size:18px;font-weight:800;color:var(--navy)}
.quiz-status{font-size:14px;color:var(--sub);margin-bottom:18px;min-height:1.5em}
.quiz-status.ok{color:var(--ok);font-weight:700}
.q-item{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px;margin-bottom:16px;scroll-margin-top:calc(var(--hdr) + 16px)}
.q-item legend{float:left;width:100%;font-weight:700;font-size:16px;line-height:1.65;margin-bottom:14px;display:flex;gap:12px}
.q-item legend .qn{flex:none;background:var(--navy);color:#fff;border-radius:8px;padding:0 10px;height:28px;line-height:28px;font-size:14px}
.q-item fieldset{border:0}
.choices{clear:both;display:flex;flex-direction:column;gap:8px}
.choice{display:block;position:relative}
.choice input{position:absolute;opacity:0;width:1px;height:1px}
.choice span{display:flex;gap:12px;align-items:flex-start;border:2px solid var(--line);border-radius:12px;padding:12px 14px;font-size:15px;line-height:1.6;cursor:pointer;transition:border-color .12s,background .12s}
.choice span:before{content:"";flex:none;width:20px;height:20px;border-radius:50%;border:2px solid #9DB3C7;margin-top:2px;background:#fff}
.choice:hover span{border-color:#9CCBE8}
.choice input:checked+span{border-color:var(--navy);background:var(--tint)}
.choice input:checked+span:before{border-color:var(--navy);box-shadow:inset 0 0 0 4px #fff;background:var(--navy)}
.q-item.wrong{border-color:#F2B8C0;background:var(--ng-t)}
.q-item.right{border-color:#A9DCCB}
.q-mark{display:none;margin-top:12px;font-size:14px;font-weight:700;border-radius:10px;padding:10px 14px}
.q-item.wrong .q-mark{display:block;color:var(--ng);background:#fff;border:1px solid #F2B8C0}
.q-item.right .q-mark{display:block;color:var(--ok);background:var(--ok-t)}
.q-item.unanswered{border-color:var(--accent);box-shadow:0 0 0 3px rgba(243,152,0,.2)}
.quiz-submit{position:sticky;bottom:0;background:rgba(246,250,253,.96);backdrop-filter:blur(6px);padding:16px 0;display:flex;align-items:center;justify-content:space-between;gap:16px;border-top:1px solid var(--line);z-index:5}
.quiz-progress{font-size:14px;color:var(--sub);font-weight:700}
.result h3{font-size:24px;line-height:1.4;margin-bottom:8px}
.result .score{font-size:56px;font-weight:800;line-height:1.1;margin:10px 0}
.result .score small{font-size:22px;color:var(--sub)}
.result.pass h3,.result.pass .score{color:var(--ok)}
.result.fail h3,.result.fail .score{color:var(--navy)}
.result p{color:var(--sub);margin-bottom:6px}
.result .wrong-list{list-style:none;text-align:left;margin:18px auto 22px;max-width:620px;display:flex;flex-direction:column;gap:8px}
.result .wrong-list li{background:var(--ng-t);border:1px solid #F2B8C0;border-radius:10px;padding:10px 14px;font-size:14px}
.result .wrong-list b{color:var(--ng)}
.result-actions{display:flex;flex-wrap:wrap;gap:12px;justify-content:center;margin-top:18px}

/* certificate */
.cert-form{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px;display:grid;gap:18px}
.cert-form label{display:flex;flex-direction:column;gap:6px;font-weight:700;font-size:15px}
.cert-form input{font:inherit;font-weight:400;border:2px solid var(--line);border-radius:10px;padding:12px 14px;font-size:16px}
.cert-form input:focus{border-color:var(--navy);outline:none}
.req,.opt{font-size:11px;font-weight:700;border-radius:4px;padding:1px 6px;margin-left:8px;vertical-align:middle}
.req{background:var(--ng);color:#fff}
.opt{background:#E3EAF0;color:var(--sub)}
.cert-form .btn{justify-self:start}
.cert-stage{margin-top:8px}
.certificate{background:#fff;aspect-ratio:297/210;width:100%;padding:3.2%;box-shadow:0 14px 34px rgba(0,40,90,.18);border-radius:6px;container-type:inline-size}
.cert-frame{height:100%;border:2px solid var(--navy);outline:6px solid var(--tint);outline-offset:-12px;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:4% 6%;position:relative}
.cert-en{font-size:clamp(9px,1.5cqi,14px);letter-spacing:.3em;color:var(--cyan-d);font-weight:700}
.cert-title{font-size:clamp(24px,6cqi,56px);color:var(--navy);font-weight:800;letter-spacing:.2em;margin:1.5% 0 3%}
.cert-org{font-size:clamp(12px,2.2cqi,20px);color:var(--sub);min-height:1em}
.cert-name{font-size:clamp(20px,4.6cqi,42px);font-weight:800;border-bottom:2px solid var(--ink);padding:0 4% 1%;margin-bottom:4%}
.cert-name small{font-size:.5em;margin-left:.6em;font-weight:600}
.cert-body{font-size:clamp(11px,2cqi,18px);line-height:1.9;margin-bottom:4%}
.cert-info{display:flex;gap:6%;justify-content:center;font-size:clamp(10px,1.7cqi,15px);margin-bottom:3%}
.cert-info div{display:flex;gap:.8em}
.cert-info dt{color:var(--sub);white-space:nowrap}
.cert-info dd{font-weight:700;white-space:nowrap}
.cert-issuer{font-size:clamp(14px,2.6cqi,24px);font-weight:800;color:var(--navy);letter-spacing:.08em}
.cert-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:20px;justify-content:center}
.cert-sync{margin-top:12px;text-align:center;font-size:13px;color:var(--sub)}
.cert-sync.ok{color:var(--navy)}
.cert-sync.ng{color:var(--ng);font-weight:700}

/* CTA */
.cta-band{background:linear-gradient(120deg,var(--navy-d),var(--navy) 55%,#0077C8);color:#fff;padding:64px 0}
.cta-in{display:flex;align-items:center;justify-content:space-between;gap:32px}
.cta-en{font-size:13px;letter-spacing:.14em;font-weight:800;color:#9BE3FA}
.cta-band h2{font-size:clamp(22px,2.8vw,30px);line-height:1.4;margin:4px 0 10px}
.cta-band p{color:#D8ECFA}
.ext{font-size:.9em}

/* footer */
.site-footer{background:#0B2540;color:#C9D7E5;font-size:14px;padding:48px 0 24px}
.ftr{display:flex;justify-content:space-between;gap:32px;flex-wrap:wrap;padding-bottom:28px;border-bottom:1px solid rgba(255,255,255,.12)}
.ftr-name{font-size:17px;font-weight:800;color:#fff;margin-bottom:8px}
.ftr-co p{line-height:1.8}
.ftr-links{list-style:none;display:grid;grid-template-columns:repeat(2,auto);gap:8px 32px;align-content:start}
.ftr-links a{color:#E6EEF6;text-decoration:none}
.ftr-links a:hover{text-decoration:underline}
.ftr-links a:after{content:" ↗";font-size:.8em;opacity:.6}
.ftr-bottom{padding-top:18px;font-size:12px;color:#9FB2C6;display:flex;justify-content:space-between;gap:24px;flex-wrap:wrap}
.ftr-bottom p:first-child{max-width:820px}

/* responsive */
@media (max-width:1024px){
  .cur-grid{grid-template-columns:repeat(2,1fr)}
  .player-layout.has-list{grid-template-columns:1fr}
}
@media (max-width:860px){
  :root{--hdr:60px}
  .menu-btn{display:flex}
  .gnav{position:fixed;top:var(--hdr);left:0;right:0;background:#fff;flex-direction:column;align-items:stretch;gap:0;padding:8px 16px 20px;border-bottom:1px solid var(--line);box-shadow:0 12px 24px rgba(0,40,90,.12);transform:translateY(-8px);opacity:0;visibility:hidden;transition:opacity .15s,transform .15s,visibility .15s}
  .gnav.open{opacity:1;visibility:visible;transform:none}
  .gnav a:not(.btn){padding:14px 4px;border-bottom:1px solid var(--line)}
  .gnav .btn{margin-top:14px}
  .hero-in{grid-template-columns:1fr;gap:32px;padding:40px 0 48px}
  .hero-visual{order:-1}
  .dl-list{grid-template-columns:1fr}
  .cta-in{flex-direction:column;align-items:flex-start}
  .sec{padding:56px 0}
}
@media (max-width:560px){
  .cur-grid{grid-template-columns:1fr}
  .quiz-card{padding:22px 16px}
  .quiz-meta dd{font-size:15px}
  .q-item{padding:18px 14px}
  .quiz-submit{flex-direction:column;align-items:stretch;text-align:center}
  .ftr-links{grid-template-columns:1fr}
  .btn-lg{padding:14px 24px;font-size:16px}
  .hero-cta .btn{flex:1}
}

/* print: certificate only */
@media print{
  @page{size:A4 landscape;margin:0}
  html,body{background:#fff}
  .site-header,.site-footer,main>section:not(#certificate),#certificate .sec-head,#certForm,.cert-actions,.cert-sync{display:none!important}
  #certificate,#certStage{display:block!important;padding:0;margin:0}
  #certificate .wrap{width:auto;margin:0}
  #certDoc{width:297mm;height:209mm;box-shadow:none;border-radius:0;padding:10mm;aspect-ratio:auto;overflow:hidden;break-inside:avoid;page-break-after:avoid}
  *{-webkit-print-color-adjust:exact;print-color-adjust:exact}
}