:root{--bg:#f6f8fb;--card:#ffffff;--ink:#172033;--muted:#667085;--line:#dfe6ef;--brand:#1f5f8b;--brand2:#3a7ca5;--soft:#eaf4fb;--ok:#18855b;--warn:#b45309}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Hiragino Sans","Yu Gothic",Meiryo,sans-serif;line-height:1.75}.app-header{padding:22px 18px;background:linear-gradient(135deg,#ffffff,#eaf4fb);border-bottom:1px solid var(--line);display:flex;justify-content:space-between;gap:16px;align-items:center}.eyebrow{font-size:13px;color:var(--brand);font-weight:700;letter-spacing:.08em}.app-header h1{font-size:24px;margin:4px 0}.app-header p{margin:0;color:var(--muted)}.tabs,.subtabs{display:flex;gap:8px;overflow:auto;padding:10px 12px;background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:5}.tabs button,.subtabs button,.btn,.ghost{border:1px solid var(--line);background:#fff;border-radius:999px;padding:9px 13px;font-weight:700;color:var(--ink);cursor:pointer;white-space:nowrap}.tabs button.active,.subtabs button.active,.btn{background:var(--brand);color:#fff;border-color:var(--brand)}.small{font-size:13px;padding:6px 10px}.ghost{background:#fff}.ghost:hover,.tabs button:hover,.subtabs button:hover{background:#f2f7fb}main{max-width:1180px;margin:0 auto;padding:16px}.card{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:18px;margin:0 0 16px;box-shadow:0 3px 10px rgba(15,23,42,.04)}.notice{background:#fbfdff}.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:14px}.module-card h3{margin:.4em 0}.module-card{border-top:5px solid var(--cat-color,var(--brand))}.category{border-top:5px solid var(--cat-color,var(--brand))}.row{display:flex;gap:10px;align-items:center;flex-wrap:wrap}.space{justify-content:space-between}.pill{display:inline-flex;align-items:center;border:1px solid var(--line);border-radius:999px;padding:4px 10px;background:#f8fafc;color:#475467;font-size:13px}.module-number{font-weight:800;color:var(--brand);background:var(--soft);border-radius:10px;padding:4px 10px}.stats{display:flex;gap:8px;flex-wrap:wrap;margin:10px 0}.muted{color:var(--muted);font-size:14px}.progress{height:9px;background:#edf2f7;border-radius:999px;overflow:hidden}.progress span{display:block;height:100%;background:var(--brand);border-radius:999px}.textbook-layout{display:grid;grid-template-columns:230px 1fr;gap:16px}.lesson-nav{position:sticky;top:62px;align-self:start}.lesson-nav a{display:block;text-decoration:none;color:var(--ink);padding:8px 10px;border-radius:10px}.lesson-nav a:hover{background:#eef6fb}.lesson-section h3{margin-top:0;border-left:5px solid var(--brand);padding-left:10px}.lesson-body{white-space:pre-wrap;font-size:16px}.reference-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:12px}.ref-card{border:1px solid var(--line);border-radius:14px;padding:13px;background:#fcfdff}.diagram{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;white-space:pre-wrap;background:#0f172a;color:#e2e8f0;border-radius:14px;padding:16px;overflow:auto}.case{border-left:5px solid #8b5cf6;background:#fbfaff}.course-unit{border:1px solid var(--line);border-radius:14px;padding:14px;margin-bottom:12px}.course-unit.done{background:#f0fdf4;border-color:#b7ebc6}.reader-item{border-top:1px solid var(--line);padding:14px 0}.reader-title{font-weight:800}.reader-body{white-space:pre-wrap;background:#f8fafc;border:1px solid var(--line);padding:14px;border-radius:12px;max-height:420px;overflow:auto}.hidden{display:none}.searchbox,input,textarea,select{width:100%;border:1px solid var(--line);border-radius:14px;padding:12px;font:inherit;background:#fff}textarea{min-height:160px}.toolbar{display:flex;gap:10px;flex-wrap:wrap;margin:12px 0}.quiz-option{display:block;width:100%;text-align:left;background:#fff;border:1px solid var(--line);border-radius:14px;padding:12px;margin:8px 0;cursor:pointer}.quiz-option.selected{border-color:var(--brand);background:#eef6fb}.quiz-option.correct{border-color:#16a34a;background:#ecfdf5}.quiz-option.wrong{border-color:#dc2626;background:#fef2f2}.explain{background:#f8fafc;border:1px solid var(--line);border-radius:12px;padding:12px;margin-top:10px}.footer{text-align:center;color:var(--muted);font-size:12px;padding:22px}.mark{background:#fff7cc}.danger{color:#b42318}.ok{color:#087443}.workbook li{margin-bottom:8px}@media(max-width:760px){.textbook-layout{display:block}.lesson-nav{position:static}.app-header{display:block}.app-header h1{font-size:20px}.tabs{top:0}main{padding:10px}.card{padding:14px;border-radius:14px}}