*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Hiragino Sans","Hiragino Kaku Gothic ProN","Noto Sans JP","Yu Gothic",sans-serif;color:#1f2328;background:#fff;line-height:1.75;font-size:16px}
.wrap{max-width:1040px;margin:0 auto;padding:0 20px}
a{color:var(--c)}
.top{position:sticky;top:0;z-index:5;background:rgba(255,255,255,.95);border-bottom:1px solid #e6e8eb}
.top .wrap{display:flex;align-items:center;gap:18px;min-height:56px}
.brand{font-weight:800;color:var(--c);text-decoration:none;white-space:nowrap}
.top nav{display:flex;gap:4px;overflow-x:auto;min-width:0;scrollbar-width:none}
.top nav::-webkit-scrollbar{display:none}
.top nav a{white-space:nowrap;text-decoration:none;color:#3b4148;font-size:14px;padding:6px 10px;border-radius:8px}
.top nav a:hover{background:var(--soft);color:var(--c)}
.hero{background:linear-gradient(160deg,var(--soft),#fff 70%);padding:56px 0 44px;border-bottom:1px solid #eef0f2}
.eyebrow{margin:0;color:var(--a);font-weight:700;letter-spacing:.06em;font-size:14px}
h1{font-size:clamp(28px,5vw,44px);line-height:1.25;margin:8px 0 12px;color:var(--c)}
.lead{font-size:18px;max-width:46em;margin:0 0 22px}
.steps{list-style:none;padding:0;margin:0;display:flex;flex-wrap:wrap;gap:10px}
.steps li{background:#fff;border:1px solid #e3e6ea;border-radius:999px;padding:6px 16px 6px 6px;font-weight:600;font-size:15px}
.steps b{display:inline-grid;place-items:center;width:26px;height:26px;border-radius:50%;background:var(--c);color:#fff;margin-right:8px;font-size:13px}
.tts-note{font-size:13px;color:#5b636b;margin:16px 0 0}
.sec{padding:52px 0}
.sec.alt{background:#f7f8f9}
h2{font-size:clamp(22px,3.4vw,30px);margin:0 0 14px;color:#16191d;border-left:6px solid var(--c);padding-left:12px;line-height:1.3}
h3{font-size:18px;margin:0 0 8px;color:var(--c)}
.intro{max-width:48em;margin:0 0 22px}
.small{font-size:13px;color:#5b636b}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(290px,1fr));gap:16px}
.card{background:#fff;border:1px solid #e3e6ea;border-radius:14px;padding:18px 18px 12px}
.card p{margin:0 0 10px}
.ex{list-style:none;padding:0;margin:0}
.ex li,.phr li,.nums li{display:flex;flex-wrap:wrap;align-items:baseline;gap:4px 12px;padding:8px 0;border-top:1px dashed #e3e6ea}
.t{font-weight:800;font-size:20px;color:#16191d}
.r{color:var(--c);font-weight:600}
.ja{color:#3b4148}
.note{flex-basis:100%;font-size:13px;color:#5b636b}
.say{margin-left:auto;border:1px solid var(--c);background:#fff;color:var(--c);border-radius:999px;font-size:13px;padding:2px 12px;cursor:pointer;font-family:inherit}
.say:hover{background:var(--c);color:#fff}
.phr{list-style:none;padding:0;margin:0 0 10px;display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:0 28px}
.nums{list-style:none;padding:0;margin:0 0 10px;display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:0 24px}
.nums b{display:inline-block;min-width:4.2em;color:#5b636b;font-weight:600}
.quiz{background:#fff;border:1px solid #e3e6ea;border-radius:16px;padding:22px;max-width:640px}
.qnum{margin:0;color:var(--a);font-weight:700;font-size:14px}
.qq{font-size:20px;font-weight:700;margin:4px 0 14px}
.choices{display:grid;gap:10px}
.choice{text-align:left;font:inherit;font-size:17px;padding:12px 16px;border:1px solid #d5d9de;border-radius:12px;background:#fff;cursor:pointer}
.choice:hover:not(:disabled){border-color:var(--c)}
.choice.ok{border-color:#2f8a4f;background:#eaf6ee}
.choice.ng{border-color:#c4473a;background:#fbecea}
.fb{min-height:1.5em;margin:12px 0}
.qres{font-size:22px;font-weight:800;color:var(--c);margin:0 0 6px}
.btn{display:inline-block;border:0;background:var(--c);color:#fff;font:inherit;font-weight:700;padding:10px 20px;border-radius:999px;cursor:pointer;text-decoration:none}
.btn:hover{filter:brightness(1.08)}
.btn.off{background:#c9cdd2;cursor:default}
.tips{margin:0;padding-left:1.2em;max-width:46em}
.tips li{margin:6px 0}
.prev{background:#fff;border:1px solid #e3e6ea;border-radius:14px;padding:18px;margin:0 0 16px}
.prev h3{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.kind{display:inline-block;background:var(--soft);color:var(--c);font-size:12px;font-weight:700;padding:2px 10px;border-radius:999px;margin:0}
.lects{margin:0;padding-left:1.4em}
.lects li{padding:6px 0;border-top:1px dashed #e3e6ea}
.lt{margin-right:10px}
.play{border:1px solid var(--a);background:#fff;color:var(--a);border-radius:999px;font:inherit;font-size:13px;padding:2px 12px;cursor:pointer}
.soon{font-size:12px;color:#7a8189;background:#f1f2f4;border-radius:999px;padding:2px 10px;white-space:nowrap}
.frame iframe{display:block;width:100%;max-width:720px;aspect-ratio:16/9;border:0;border-radius:10px;margin:10px 0 4px}
.courses{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:16px}
.course{background:#fff;border:1px solid #e3e6ea;border-radius:16px;padding:20px;display:flex;flex-direction:column;gap:6px}
.course h3{margin:0}
.course p{margin:0}
.course .sub{font-size:14px;color:#3b4148}
.course .meta{font-size:13px;color:#5b636b;margin-bottom:8px}
.course .btn{margin-top:auto;text-align:center}
footer{background:#1f2328;color:#c9cdd2;padding:28px 0;font-size:13px}
footer p{margin:4px 0}
@media (max-width:600px){
 .top .wrap{gap:10px}.brand{font-size:15px}
 .hero{padding:36px 0 30px}.lead{font-size:16px}
 .sec{padding:40px 0}
 .phr,.grid,.courses{grid-template-columns:1fr}
 .nums{grid-template-columns:1fr 1fr}
 .nums li{flex-direction:column;align-items:flex-start;gap:0}
 .nums .say{margin-left:0}
}