/* prob_app.css — 확률과 통계 단원 앱 공용 스타일 (alg_app.css의 틸 변주) */
:root{--panel:#fff;--ink:#1e293b;--sub:#64748b;--line:#e2e8f0;--accent:#0f766e;--accent-d:#134e4a;--accent-bg:#f0fdfa;--green:#16a34a;--green-bg:#f0fdf4;--amber:#d97706;--amber-bg:#fffbeb;--red:#dc2626;--red-bg:#fef2f2;--indigo:#4f46e5}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI','Malgun Gothic',sans-serif;background:#f1f5f9;color:var(--ink);line-height:1.7;-webkit-text-size-adjust:100%}
a{color:var(--accent)}
.crumb{background:#f8fafc;border-bottom:1px solid var(--line);padding:7px 16px;font-size:12px;display:flex;align-items:center;gap:5px;flex-wrap:wrap}
.crumb a{color:var(--sub);text-decoration:none}.crumb a.cur{color:var(--accent);font-weight:600}.crumb span{color:#cbd5e1}
.hero{background:linear-gradient(135deg,#134e4a,#0f766e 60%,#14b8a6);color:#fff;padding:26px 18px 22px;text-align:center}
.hero .badge{display:inline-block;background:rgba(255,255,255,.18);border:1px solid rgba(255,255,255,.3);border-radius:20px;padding:3px 13px;font-size:12px;margin-bottom:10px}
.hero h1{font-size:21px;font-weight:800;letter-spacing:-.3px}.hero p{font-size:13px;opacity:.92;margin-top:6px}
.tabs{position:sticky;top:0;z-index:50;display:flex;background:#042f2e;overflow-x:auto;scrollbar-width:none}.tabs::-webkit-scrollbar{display:none}
.tab{flex:0 0 auto;padding:13px 14px;min-height:44px;color:#99f6e4;font-size:13.5px;font-weight:600;cursor:pointer;border:none;background:none;border-bottom:3px solid transparent;white-space:nowrap}
.tab.active{color:#fff;border-bottom-color:#2dd4bf}
.wrap{max-width:820px;margin:0 auto;padding:22px 16px 70px}
.page{display:none}.page.active{display:block;animation:fade .25s ease}
@keyframes fade{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
.card{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:20px;margin-bottom:16px;box-shadow:0 1px 3px rgba(0,0,0,.04)}
.card h2{font-size:18px;font-weight:800;margin-bottom:6px}.card h3{font-size:15px;font-weight:700;margin:16px 0 8px;color:var(--accent-d)}.card p{font-size:14px;margin-bottom:8px}.lead{color:var(--sub);font-size:13px;margin-bottom:14px}
table{width:100%;border-collapse:collapse;font-size:13px;margin:10px 0}th,td{border:1px solid var(--line);padding:8px 9px;text-align:center}th{background:#f8fafc;font-weight:700}td.l,th.l{text-align:left}
.box{border-radius:10px;padding:13px 15px;margin:10px 0;font-size:13.5px}
.box.g{background:var(--green-bg);border:1px solid #bbf7d0}.box.a{background:var(--amber-bg);border:1px solid #fde68a}.box.b{background:var(--accent-bg);border:1px solid #99f6e4}
.box .t{font-weight:800;margin-bottom:4px}.box.g .t{color:var(--green)}.box.a .t{color:var(--amber)}.box.b .t{color:var(--accent-d)}
.hook{background:linear-gradient(135deg,#f0fdfa,#ccfbf1);border:1px solid #99f6e4;border-radius:12px;padding:16px 18px;margin:12px 0;font-size:14px}.hook .ht{color:var(--accent);font-weight:800;font-size:15px;margin-bottom:6px}
.keeper{background:linear-gradient(135deg,#fffbeb,#fef3c7);border:1px solid #fcd34d;border-radius:12px;padding:15px 17px;margin:12px 0}.keeper .kt{color:#b45309;font-weight:800;font-size:14.5px;margin-bottom:8px}
.keeper ol{margin:0;list-style:none}.keeper li{position:relative;padding:8px 0 8px 34px;font-size:13.5px;border-bottom:1px dashed #fde68a}.keeper li:last-child{border-bottom:none}.keeper li::before{content:"📌";position:absolute;left:4px;top:8px}
.insight{background:var(--accent-bg);border:1px solid #99f6e4;border-radius:12px;padding:14px 16px;margin:12px 0;font-size:13.5px}.insight .it{color:var(--accent);font-weight:800;margin-bottom:5px}
.reallife{background:var(--green-bg);border:1px solid #bbf7d0;border-radius:12px;padding:14px 16px;margin:12px 0}.reallife .rt{color:var(--green);font-weight:800;margin-bottom:8px}
.rgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:9px}.rcell{background:#fff;border:1px solid #bbf7d0;border-radius:9px;padding:10px}.rcell .ri{font-size:22px}.rcell .rn{font-weight:800;font-size:13px;margin:3px 0}.rcell .rd{font-size:11.5px;color:#475569;line-height:1.5}
.industry{background:#eef2ff;border:1px solid #c7d2fe;border-radius:12px;padding:14px 16px;margin:12px 0}.industry .indt{color:var(--indigo);font-weight:800;margin-bottom:8px}
.indrow{display:flex;gap:11px;align-items:flex-start;padding:9px 0;border-bottom:1px solid #e0e7ff}.indrow:last-child{border-bottom:none}.indrow .ii{font-size:24px;flex-shrink:0}.indrow .id2{font-size:13px}.indrow .id2 b{color:#312e81}
.major{display:inline-block;background:#312e81;color:#c7d2fe;border-radius:6px;padding:2px 8px;font-size:10.5px;font-weight:700;margin-top:4px}
.sci{display:flex;gap:13px;align-items:flex-start;background:linear-gradient(135deg,#fffbeb,#fef3c7);border:1px solid #fde68a;border-radius:12px;padding:15px;margin:12px 0}.sci .ava{font-size:34px;line-height:1;flex-shrink:0}.sci .st{font-weight:800;color:#92400e;font-size:14px;margin-bottom:3px}.sci .sd{font-size:13px;color:#78350f}
.toc{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:10px;margin-top:8px}
.toc button{text-align:left;background:var(--accent-bg);border:1px solid #99f6e4;border-radius:10px;padding:12px;cursor:pointer;font:inherit;min-height:44px}.toc .ti{font-size:20px}.toc .tn{font-weight:800;font-size:13.5px;margin-top:4px}.toc .td{font-size:11.5px;color:var(--sub)}
.splink{display:block;background:#fffbeb;border:1.5px dashed #fcd34d;border-radius:12px;padding:12px 14px;margin:12px 0;font-size:13.5px;line-height:1.8}.splink a{font-weight:800;color:#b45309;text-decoration:none;white-space:nowrap}
.fcards{display:grid;grid-template-columns:1fr;gap:9px;margin:10px 0}.fcell{border:1px solid var(--line);border-radius:10px;padding:12px 14px;background:#fff;cursor:pointer}.fcell:hover{border-color:var(--accent);background:var(--accent-bg)}
.fcell .flhs{font-size:15px}.fcell .frhs{display:none;margin-top:6px;padding-top:6px;border-top:1px dashed var(--line);color:var(--accent-d);font-size:14px}.fcell.show .frhs{display:block}.fcell .ftap{font-size:11px;color:var(--sub);float:right}
.widget{background:#fff;border:1px solid var(--line);border-radius:12px;padding:12px;margin:10px 0}.widget canvas{display:block;width:100%;max-width:520px;margin:0 auto;border-radius:8px;touch-action:pan-y}
.row{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin:8px 0 4px;font-size:13px}.row input[type=range]{flex:1;min-width:120px;min-height:44px;accent-color:var(--accent)}.row .v{font-weight:800;color:var(--accent);min-width:50px;text-align:right}
.btns{display:flex;gap:8px;flex-wrap:wrap;margin:8px 0}.btns button{background:#fff;border:1.5px solid #99f6e4;color:var(--accent-d);border-radius:999px;padding:8px 14px;font:inherit;font-weight:700;cursor:pointer;min-height:44px}.btns button.on{background:var(--accent);color:#fff;border-color:var(--accent)}
.out{background:#0f172a;color:#e2e8f0;border-radius:10px;padding:12px 14px;margin-top:8px;font-size:14px;text-align:center;min-height:44px}.out b{color:#5eead4}.out .katex{color:#f1f5f9}
.ladder{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:9px;margin:10px 0}.ladder div{background:#f8fafc;border:1px solid var(--line);border-radius:10px;padding:10px;font-size:13px}.ladder b{display:block;color:var(--accent-d);margin-bottom:3px}
.steps{margin:10px 0}.stepbtn{background:var(--accent);color:#fff;border:none;border-radius:9px;padding:11px 16px;font:inherit;font-weight:700;font-size:13.5px;cursor:pointer;min-height:44px}
.stepwrap{display:none;margin-top:10px}.stepwrap.open{display:block}.step{border:1px solid var(--line);border-radius:10px;padding:11px 14px;margin:8px 0;background:#fff;font-size:14px}.step .sn{display:inline-block;background:var(--accent);color:#fff;border-radius:6px;padding:1px 8px;font-size:12px;font-weight:800;margin-right:6px}.step .why{font-size:12px;color:var(--sub);margin-top:4px}
.ans{background:#ecfdf5;border:2px solid #6ee7b7;border-radius:10px;padding:12px 15px;text-align:center;font-size:16px;font-weight:800;color:#065f46;margin:10px 0}
.quizhud{display:flex;align-items:center;gap:12px;flex-wrap:wrap;background:#0f172a;color:#e2e8f0;border-radius:12px;padding:12px 16px;margin-bottom:14px}.quizhud .qn{font-weight:800;font-size:14px}.quizhud .sc{margin-left:auto;font-size:13px}.quizhud .sc b{color:#5eead4;font-size:16px}
.qbar{flex-basis:100%;height:8px;background:#334155;border-radius:20px;overflow:hidden;margin-top:2px}.qbar > i{display:block;height:100%;background:linear-gradient(90deg,#5eead4,#0f766e)}
.qq{font-size:16px;font-weight:700;text-align:center;margin:10px 0 16px}.qopts{display:grid;gap:10px}
.qopt{border:2px solid var(--line);background:#fff;border-radius:12px;padding:14px;font:inherit;font-size:15px;font-weight:700;cursor:pointer;min-height:52px;text-align:left}.qopt.correct{background:var(--green-bg);border-color:#6ee7b7;color:#065f46}.qopt.wrong{background:var(--red-bg);border-color:#fecaca;color:#991b1b}.qopt.dim{opacity:.5}
.qexp{display:none;margin-top:14px;background:#f8fafc;border:1px solid var(--line);border-radius:10px;padding:13px 15px;font-size:13.5px}.qexp.show{display:block}.qexp .et{font-weight:800;margin-bottom:4px}
.fix{display:inline-block;margin-top:8px;background:#fff7ed;border:1px solid #fed7aa;color:#c2410c;border-radius:999px;padding:9px 12px;font-size:12.5px;font-weight:700;cursor:pointer;min-height:44px}
.qnext{display:none;margin-top:14px;width:100%;background:var(--accent);color:#fff;border:none;border-radius:10px;padding:13px;font:inherit;font-weight:800;font-size:14px;cursor:pointer;min-height:48px}.qnext.show{display:block}
.qdone{text-align:center;padding:10px 0}.qdone .big{font-size:40px;font-weight:800;color:var(--accent)}
.btn{display:inline-block;background:var(--accent);color:#fff;border:none;border-radius:10px;padding:11px 18px;font:inherit;font-weight:700;font-size:13.5px;cursor:pointer;text-decoration:none;min-height:44px}
.chk{display:flex;align-items:flex-start;gap:9px;padding:9px 0;border-bottom:1px solid var(--line);font-size:13.5px}.chk:last-child{border-bottom:none}.chk input{margin-top:4px;width:17px;height:17px;flex-shrink:0;accent-color:var(--accent)}
.tag{display:inline-block;background:var(--accent-bg);color:var(--accent);border:1px solid #99f6e4;border-radius:6px;padding:2px 9px;font-size:11.5px;font-weight:700;margin:3px 4px 0 0}
.deep{display:inline-block;background:#1e293b;color:#e2e8f0;border-radius:6px;padding:1px 8px;font-size:11px;font-weight:700;margin-left:4px}
@media (max-width:640px){.hero h1{font-size:19px}.card{padding:16px}}