:root {
  --ink: #0f2d31; --ink-2: #3d585c; --teal: #1f8a95; --teal-d: #0f3d42; --teal-l: #7fd5dc;
  --bg: #eef4f4; --card: #ffffff; --line: rgba(15, 45, 49, 0.12); --gold: #ffd166; --red: #d64545; --green: #2f9e6b;
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body { font-family: "Noto Sans JP", "Hiragino Sans", "Yu Gothic", Meiryo, system-ui, sans-serif; color: var(--ink); background: var(--bg); line-height: 1.6; font-size: 16px; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; }
.wrap { max-width: 1180px; margin: 0 auto; padding: 0 20px; }

#hdr { background: var(--teal-d); color: #f3f7f7; padding: 18px 0 16px; }
#hdr .wrap { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 24px; }
#hdr .course { font-size: 13px; letter-spacing: 0.14em; color: var(--teal-l); font-weight: 700; width: 100%; }
#hdr .course b { color: var(--gold); }
#hdr h1 { margin: 0; font-size: 22px; font-weight: 900; flex: 1; }
#hdr h1 span { color: var(--teal-l); font-weight: 700; font-size: 18px; }
.hdr-tools { display: flex; gap: 8px; }
.ghost { background: transparent; border: 1.5px solid rgba(243, 247, 247, 0.5); color: #f3f7f7; border-radius: 999px; padding: 6px 14px; font-size: 13px; }
.ghost:hover { background: rgba(255, 255, 255, 0.1); }

#layout { display: grid; grid-template-columns: 260px 1fr; gap: 28px; padding-top: 28px; padding-bottom: 60px; }
#nav { position: sticky; top: 16px; align-self: start; background: var(--card); border-radius: 16px; padding: 16px; border: 1px solid var(--line); }
.nav-title { font-size: 12px; letter-spacing: 0.12em; color: var(--teal); font-weight: 700; margin: 8px 0 6px; }
#nav ol, #nav ul { list-style: none; margin: 0 0 12px; padding: 0; }
#nav li a { display: flex; align-items: center; gap: 10px; padding: 8px 10px; border-radius: 10px; font-size: 14px; color: var(--ink-2); }
#nav li a:hover { background: var(--bg); }
#nav li a.active { background: var(--teal-d); color: #fff; }
#nav .dot { width: 22px; height: 22px; border-radius: 50%; border: 2px solid var(--line); flex: none; display: inline-flex; align-items: center; justify-content: center; font-size: 11px; font-weight: 700; color: var(--ink-2); background: #fff; }
#nav .dot.done { background: var(--green); border-color: var(--green); color: #fff; }
#nav li a.active .dot { border-color: rgba(255,255,255,0.5); }

main { min-width: 0; }
.card { background: var(--card); border-radius: 18px; border: 1px solid var(--line); padding: 24px 28px; margin-bottom: 20px; }
.card h2 { margin: 0 0 6px; font-size: 22px; font-weight: 900; }
.card h3 { margin: 0 0 12px; font-size: 16px; color: var(--teal); letter-spacing: 0.06em; font-weight: 700; display: flex; align-items: center; gap: 10px; }
.card h3 .num { display: inline-flex; width: 28px; height: 28px; border-radius: 50%; background: var(--teal); color: #fff; align-items: center; justify-content: center; font-size: 14px; }
.eyebrow { font-size: 12px; letter-spacing: 0.14em; color: var(--teal); font-weight: 700; }
.badge { display: inline-block; font-size: 12px; padding: 2px 10px; border-radius: 999px; background: var(--bg); color: var(--ink-2); margin-left: 8px; vertical-align: middle; }
.badge.draft { background: #fff3d6; color: #8a5a00; }
.keyword { margin-top: 14px; background: var(--gold); border-radius: 12px; padding: 12px 18px; font-weight: 900; font-size: 18px; }
.keyword small { display: block; font-size: 12px; letter-spacing: 0.14em; font-weight: 700; margin-bottom: 2px; }

.points { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.point { background: var(--bg); border-radius: 14px; padding: 14px 16px; }
.point b { display: block; font-size: 15px; margin-bottom: 4px; }
.point b i { font-style: normal; color: var(--teal); margin-right: 6px; }
.point p { margin: 0; font-size: 13.5px; color: var(--ink-2); }

.q { border: 1px solid var(--line); border-radius: 14px; padding: 16px 18px; margin-bottom: 12px; }
.q .qt { font-weight: 700; margin-bottom: 10px; }
.q .qt i { font-style: normal; color: var(--teal); margin-right: 8px; }
.choice { display: flex; gap: 10px; align-items: flex-start; width: 100%; text-align: left; background: #fff; border: 1.5px solid var(--line); border-radius: 10px; padding: 10px 14px; margin-bottom: 8px; color: var(--ink); }
.choice:hover { border-color: var(--teal); }
.choice .k { flex: none; width: 24px; height: 24px; border-radius: 50%; background: var(--bg); display: inline-flex; align-items: center; justify-content: center; font-size: 12px; font-weight: 700; }
.choice.right { border-color: var(--green); background: #eaf7f0; }
.choice.right .k { background: var(--green); color: #fff; }
.choice.wrong { border-color: var(--red); background: #fbeeee; }
.choice.wrong .k { background: var(--red); color: #fff; }
.choice.picked { border-width: 2px; }
.why { display: none; margin-top: 6px; padding: 10px 14px; border-left: 4px solid var(--teal); background: var(--bg); border-radius: 8px; font-size: 14px; }
.why.show { display: block; }
.score { font-weight: 700; color: var(--teal); margin-top: 6px; }

textarea, input[type="text"], input[type="date"] { width: 100%; font: inherit; border: 1.5px solid var(--line); border-radius: 10px; padding: 10px 12px; background: #fff; color: var(--ink); }
textarea { min-height: 88px; resize: vertical; }
textarea:focus, input:focus { outline: 2px solid var(--teal-l); border-color: var(--teal); }
label.f { display: block; font-size: 13px; font-weight: 700; color: var(--ink-2); margin: 12px 0 4px; }
.saved { font-size: 12px; color: var(--green); margin-top: 4px; height: 16px; }

.case-s { background: var(--bg); border-radius: 12px; padding: 14px 16px; margin-bottom: 12px; }
.case-s b { color: var(--teal); }
.model { display: none; margin-top: 10px; border: 2px dashed var(--teal); border-radius: 12px; padding: 12px 16px; }
.model.show { display: block; }
.model .eyebrow { margin-bottom: 4px; }

.btn { background: var(--teal); color: #fff; border: 0; border-radius: 999px; padding: 10px 20px; font-weight: 700; }
.btn:hover { background: #17727b; }
.btn.sec { background: #fff; color: var(--teal); border: 2px solid var(--teal); }
.btn.gold { background: var(--gold); color: var(--ink); }
.btn[disabled] { opacity: 0.5; cursor: default; }
.row { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin-top: 12px; }
.pager { display: flex; justify-content: space-between; gap: 10px; }

.done-box { border: 2px solid var(--green); background: #eaf7f0; border-radius: 14px; padding: 14px 18px; font-weight: 700; color: #1f6b48; }
.todo-box { border: 2px solid var(--line); border-radius: 14px; padding: 14px 18px; color: var(--ink-2); font-size: 14px; }
.todo-box ul { margin: 6px 0 0; padding-left: 20px; }

/* progress */
.prog { display: grid; gap: 10px; }
.prow { display: grid; grid-template-columns: 34px 1fr 120px; align-items: center; gap: 12px; }
.prow .pn { width: 34px; height: 34px; border-radius: 50%; background: var(--bg); display: flex; align-items: center; justify-content: center; font-weight: 900; color: var(--teal); }
.prow .pn.done { background: var(--green); color: #fff; }
.prow .bar { height: 10px; background: var(--bg); border-radius: 999px; overflow: hidden; }
.prow .bar i { display: block; height: 100%; background: var(--teal); }
.prow .pl { font-size: 14px; }
.prow .pl small { color: var(--ink-2); display: block; }
.cert { margin-top: 18px; padding: 24px; border-radius: 16px; background: var(--teal-d); color: #f3f7f7; text-align: center; }
.cert b { display: block; font-size: 26px; margin: 6px 0 4px; color: var(--gold); }

/* checksheet */
.chk-grid { display: grid; grid-template-columns: 1fr; gap: 8px; }
.chk { display: grid; grid-template-columns: 1fr 150px; gap: 10px; align-items: center; border: 1px solid var(--line); border-radius: 12px; padding: 10px 14px; }
.chk .cn { font-weight: 700; }
.chk .cs { font-size: 12.5px; color: var(--ink-2); }
.jd { text-align: center; border-radius: 999px; padding: 6px 10px; font-weight: 700; font-size: 13px; }
.jd.ok { background: #eaf7f0; color: #1f6b48; }
.jd.anon { background: #fff3d6; color: #8a5a00; }
.jd.ng { background: #fbeeee; color: #a82b2b; }
.gate { display: grid; gap: 8px; }
.gate label { display: flex; gap: 10px; align-items: center; border: 1px solid var(--line); border-radius: 10px; padding: 10px 14px; cursor: pointer; }
.gate input { width: 20px; height: 20px; }
.verdict { margin-top: 12px; padding: 14px 18px; border-radius: 12px; font-weight: 700; }
.verdict.ok { background: #eaf7f0; color: #1f6b48; }
.verdict.ng { background: #fbeeee; color: #a82b2b; }

/* rules doc */
.optlist { display: grid; grid-template-columns: repeat(2, 1fr); gap: 6px 14px; }
.optlist label { display: flex; gap: 8px; align-items: flex-start; font-size: 14px; }
.doc { background: #fff; border: 1px solid var(--line); border-radius: 12px; padding: 28px 32px; font-size: 14.5px; }
.doc h4 { margin: 0 0 4px; font-size: 20px; text-align: center; }
.doc .meta { text-align: right; color: var(--ink-2); font-size: 13px; margin-bottom: 14px; }
.doc h5 { margin: 16px 0 6px; font-size: 15px; border-left: 4px solid var(--teal); padding-left: 8px; }
.doc ul { margin: 0; padding-left: 22px; }
.doc .empty { color: #999; }

/* teacher overlay */
#teacher { position: fixed; inset: 0; background: var(--teal-d); color: #f3f7f7; z-index: 50; display: flex; flex-direction: column; }
#teacher[hidden] { display: none; }
.t-bar { display: flex; align-items: center; gap: 20px; padding: 16px 28px; border-bottom: 1px solid rgba(255,255,255,0.15); }
.t-title { font-weight: 900; font-size: 18px; letter-spacing: 0.1em; color: var(--teal-l); flex: 1; }
.t-timer { display: flex; align-items: center; gap: 8px; }
.t-timer span { font-size: 40px; font-weight: 900; font-variant-numeric: tabular-nums; min-width: 130px; text-align: center; color: var(--gold); }
.t-timer button { background: rgba(255,255,255,0.12); border: 0; color: #fff; border-radius: 999px; padding: 8px 14px; }
.t-timer button:hover { background: rgba(255,255,255,0.22); }
.t-body { flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: center; padding: 40px; text-align: center; }
.t-topic-label { letter-spacing: 0.16em; color: var(--teal-l); font-weight: 700; margin-bottom: 18px; }
.t-topic { font-size: clamp(28px, 4vw, 54px); font-weight: 900; line-height: 1.4; max-width: 1100px; }
.t-topic small { display: block; font-size: 0.45em; color: var(--teal-l); margin-bottom: 14px; font-weight: 700; }
.t-nav { margin-top: 40px; display: flex; gap: 14px; }
.t-nav button { background: transparent; border: 2px solid rgba(255,255,255,0.4); color: #fff; border-radius: 999px; padding: 10px 22px; font-size: 16px; }
.t-nav button:hover { background: rgba(255,255,255,0.12); }
#teacher.alarm .t-timer span { color: var(--red); }

@media (max-width: 860px) {
  #layout { grid-template-columns: 1fr; }
  #nav { position: static; }
  .points { grid-template-columns: 1fr; }
  .optlist { grid-template-columns: 1fr; }
  .chk { grid-template-columns: 1fr; }
  #hdr h1 { font-size: 18px; }
}
@media print {
  #hdr, #nav, .no-print, #teacher { display: none !important; }
  #layout { display: block; padding: 0; }
  .card { border: 0; padding: 0; }
  body { background: #fff; }
}