:root{--bg:#f6f1e4;--ink:#1c3640;--mute:#5f6e72;--card:#fffdf6;--line:#d9d2bd;--accent:#1f8a7a;--red:#c0392b;--paper:#fffdf6}
*{box-sizing:border-box}
body{margin:0;background:var(--bg) linear-gradient(rgba(60,110,120,.07) 1px,transparent 1px) 0 0/100% 28px;color:var(--ink);font-family:"Zen Maru Gothic",system-ui,sans-serif;line-height:1.85;font-size:17px}
.serif{font-family:"Shippori Mincho",serif}
.wrap{max-width:760px;margin:0 auto;padding:0 18px}
a{color:inherit}
.top{padding:36px 0 14px}.kick{font-size:13px;color:var(--mute);letter-spacing:.06em}
h1{font-size:38px;line-height:1.3;margin:6px 0 8px}h1 em{font-style:normal;color:var(--accent)}
.stats{font-size:14px;color:var(--mute)}
.chips{display:flex;gap:8px;flex-wrap:wrap;margin:10px 0}
.chip{border:1px solid var(--line);background:#fff;border-radius:999px;padding:6px 14px;font:inherit;font-size:14px;cursor:pointer}
.chip.on{background:var(--ink);color:#fff;border-color:var(--ink)}
.tools{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:14px 0}
.tool{display:block;text-decoration:none;background:#fff;border:1px solid var(--line);border-left:6px solid var(--accent);border-radius:14px;padding:12px 14px;line-height:1.5}
.tool b{display:block}.tool span{font-size:13px;color:var(--mute)}
.today{background:var(--card);border:1px solid var(--line);border-left:6px solid var(--accent);border-radius:14px;padding:12px 18px;margin:14px 0}.today small{color:var(--mute)}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:14px;margin:14px 0 40px}
.card{position:relative;display:block;text-decoration:none;background:var(--card);border:1px solid var(--line);border-radius:16px;overflow:hidden;box-shadow:0 2px 0 var(--line)}
.card .band{background:var(--accent);color:#fff;font-size:12px;padding:5px 12px;display:flex;justify-content:space-between}
.card .body{padding:12px 14px 16px}.card h3{margin:0 0 6px;font-size:18px;line-height:1.45}.card .qq{font-size:14px;color:var(--mute);line-height:1.6}
.stamp{position:absolute;right:10px;bottom:10px;border:2px solid var(--red);color:var(--red);border-radius:8px;padding:0 8px;font-weight:700;transform:rotate(-8deg);font-size:13px}
.badge{display:inline-block;font-size:12px;border:1px solid #fff9;border-radius:6px;padding:0 8px}
.hero{background:var(--accent);color:#fff;padding:26px 0 24px}
.hero .meta{display:flex;gap:10px;flex-wrap:wrap;font-size:13px;align-items:center;margin-bottom:6px}
.hero h1{font-size:30px;margin:4px 0 10px}.hero .q{font-size:19px;font-weight:700;line-height:1.6}
.back{display:inline-block;margin:14px 0;font-size:14px;color:var(--mute);text-decoration:none}
.sec{margin:30px 0}.sec h2{font-size:22px;margin:0 0 12px;padding-left:12px;border-left:6px solid var(--accent)}
.panel{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:14px 18px}
.step{display:flex;gap:14px;margin:16px 0}
.step .n{flex:none;width:34px;height:34px;border-radius:50%;background:var(--accent);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700}
.step h3{margin:0 0 4px;font-size:19px}.step p{margin:0 0 8px}
.one{background:var(--ink);color:#fff;border-radius:14px;padding:16px 20px;font-size:20px;font-weight:700;margin:26px 0}
.one small{display:block;font-weight:400;opacity:.7;font-size:13px}
.dont{background:#fff3f1;border:2px solid #e8a79d;border-radius:14px;padding:12px 18px;margin:14px 0}
.dont h2{color:var(--red);border-color:var(--red)}.dont li{margin:6px 0}
.safety{background:#fff8e5;border:2px solid #e8c766;border-radius:12px;padding:8px 16px;margin:14px 0;font-size:15px}
ul.tl{padding-left:20px;margin:6px 0}ul.tl li{margin:6px 0}
table.num{width:100%;border-collapse:collapse;font-size:15px;background:#fff}
table.num td,table.num th{border:1px solid var(--line);padding:6px 10px;text-align:left}table.num th{background:#eef5f1}
.src{font-size:13px;color:var(--mute)}
.opt{display:block;width:100%;text-align:left;margin:8px 0;padding:10px 14px;border:2px solid var(--line);background:#fff;border-radius:12px;font:inherit;cursor:pointer}
.opt:hover:not(:disabled){border-color:var(--accent)}
.opt.ok{border-color:#23804f;background:#e8f6ee}.opt.ng{border-color:var(--red);background:#fdeceb}
.why{display:none;margin-top:6px;font-size:15px}.why.show{display:block}
.result{font-weight:700;margin-top:8px}
details{background:#fff;border:1px solid var(--line);border-radius:12px;padding:8px 14px;margin:8px 0}summary{cursor:pointer;font-weight:700}
.btn{display:block;width:100%;text-align:center;font:inherit;font-weight:700;background:var(--ink);color:#fff;border:0;border-radius:14px;padding:12px 8px;cursor:pointer;margin:14px 0}
.btn.on{background:#23804f}
.links{display:flex;flex-wrap:wrap;gap:8px}.links a{background:#fff;border:1px solid var(--line);border-radius:10px;padding:4px 12px;font-size:14px;text-decoration:none}
.note-box{font-size:14px;color:var(--mute);background:#fff;border:1px dashed var(--line);border-radius:10px;padding:8px 14px}
.sel{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.sel select,.fld input{width:100%;font:inherit;padding:10px;border:2px solid var(--line);border-radius:12px;background:#fff}
.verdict{border-radius:14px;padding:14px 18px;margin:14px 0;border:2px solid;font-size:16px}
.v0{background:#e8f6ee;border-color:#23804f}.v1{background:#fff8e5;border-color:#e8c766}.v2,.v3{background:#fdeceb;border-color:var(--red)}
.verdict h2{margin:0 0 6px;font-size:21px}
.fld{margin:12px 0}.fld label{display:block;font-size:14px;color:var(--mute)}
footer{text-align:center;color:var(--mute);font-size:13px;padding:30px 0 50px}
@media(max-width:520px){h1{font-size:32px}.hero h1{font-size:26px}.tools{grid-template-columns:1fr}}
#predict .panel{border:0;padding:0;margin:0;background:none}

/* ===== v2: 実験ノート ===== */
svg.i{width:1.15em;height:1.15em;vertical-align:-.2em;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}
.lab-top{background:linear-gradient(180deg,#1c3640,#244a56);color:#f6f1e4;padding:34px 0 26px;border-bottom:6px solid var(--accent);position:relative;overflow:hidden}
.lab-top .wrap{max-width:980px;position:relative}
.lab-top h1{font-size:44px;margin:8px 0 6px;color:#fffdf6}.lab-top h1 em{color:#7fe0c8}
.lab-top .kick{color:#b8d3cf}.lab-top p{color:#d8e6e3;margin:6px 0 10px;max-width:34em}.lab-top .stats{color:#9fc0bb}
.etiles{display:flex;gap:7px;flex-wrap:wrap;margin:14px 0 4px}
.et{width:46px;height:52px;border:2px solid #fffdf6;border-radius:6px;display:flex;flex-direction:column;align-items:center;justify-content:center;line-height:1;background:rgba(255,255,255,.07);font-family:"Shippori Mincho",serif;color:#fffdf6;position:relative}
.et b{font-size:19px}.et small{position:absolute;top:2px;left:4px;font-size:9px;opacity:.7;font-family:"Zen Maru Gothic",sans-serif}
.et.a{border-color:#7fe0c8;color:#7fe0c8}.et.b{border-color:#f2b66b;color:#f2b66b}.et.c{border-color:#f08f84;color:#f08f84}.et.d{border-color:#9bb8f2;color:#9bb8f2}
.wide{max-width:980px;margin:0 auto;padding:0 18px}
.grid{grid-template-columns:repeat(auto-fill,minmax(270px,1fr));gap:18px}
.card{border:2px solid var(--accent);border-radius:12px;background:var(--paper);box-shadow:3px 3px 0 var(--accent);transition:transform .15s}
.card:hover{transform:translate(-2px,-2px);box-shadow:5px 5px 0 var(--accent)}
.card .thumb{display:block;width:100%;aspect-ratio:16/9;object-fit:cover;background:#e9e3cf;border-bottom:2px solid var(--accent)}
.card .thumb.none{display:flex;align-items:center;justify-content:center;font:800 54px "Shippori Mincho",serif;color:var(--accent);background:repeating-linear-gradient(45deg,#f1ebd6,#f1ebd6 8px,#ece5cc 8px,#ece5cc 16px)}
.card .band{background:transparent;color:var(--accent);font-weight:700;border-bottom:1px dashed var(--line)}
.card .no{font:700 12px "Shippori Mincho",serif;color:var(--mute)}
.tools{grid-template-columns:1fr 1fr}
.tool{border:2px solid var(--ink);border-left:2px solid var(--ink);border-radius:12px;background:var(--paper);box-shadow:3px 3px 0 var(--ink)}
.today{background:#fff6d8;border:2px dashed #d8b84a;border-left:2px dashed #d8b84a;border-radius:12px}
.chip{border:2px solid var(--line);background:var(--paper)}.chip.on{background:var(--ink);border-color:var(--ink)}
.chip svg.i{margin-right:2px}
.hero{background:var(--accent);padding:0;overflow:hidden;position:relative}
.hero .in{max-width:980px;margin:0 auto;display:grid;grid-template-columns:1.1fr 1fr;gap:0;align-items:stretch}
.hero .tx{padding:28px 20px 26px}
.hero .im{background:#e9e3cf;min-height:220px;position:relative}.hero .im img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.hero .im .cap{position:absolute;right:6px;bottom:4px;font-size:10px;color:#fff;background:#0007;border-radius:4px;padding:0 6px}
.hero .im.none{display:none}.hero .in.noim{grid-template-columns:1fr}
.hero h1{font-size:32px}
.cwrap{max-width:760px;margin:0 auto;padding:0 18px}
.sec h2{border-left:0;padding-left:0;display:flex;align-items:center;gap:8px;font-size:23px;border-bottom:3px solid var(--accent);padding-bottom:4px}
.sec h2 svg.i{color:var(--accent)}
.labcard{background:var(--paper);border:2px dashed var(--accent);border-radius:14px;padding:16px 18px;position:relative}
.labcard .tag{position:absolute;top:-13px;left:14px;background:var(--accent);color:#fff;font-size:13px;font-weight:700;padding:1px 12px;border-radius:999px}
.step{background:var(--paper);border:1px solid var(--line);border-radius:14px;padding:14px 16px}
.step .n{border-radius:8px;font-family:"Shippori Mincho",serif;font-size:19px}
.hee,.nowb,.story{border-radius:14px;padding:14px 18px 14px 56px;margin:22px 0;position:relative;font-size:16px}
.hee{background:#fff1c9;border:2px solid #e3bf55}.nowb{background:#e5f3f1;border:2px solid #7cc4b8}.story{background:#efe9ff;border:2px solid #b5a5e6}
.hee:before,.nowb:before,.story:before{position:absolute;left:12px;top:10px;width:34px;height:34px;border-radius:50%;color:#fff;display:flex;align-items:center;justify-content:center;font:700 17px "Shippori Mincho",serif}
.hee:before{content:"へえ";background:#d49a1f;font-size:13px}.nowb:before{content:"今";background:#2a8f80}.story:before{content:"話";background:#7a5fc6}
.hee b,.nowb b,.story b{display:block;margin-bottom:2px}
figure.fig{margin:20px 0;background:var(--paper);border:1px solid var(--line);border-radius:14px;padding:10px}
figure.fig svg{width:100%;height:auto;display:block}figure.fig figcaption{font-size:14px;color:var(--mute);text-align:center;margin-top:4px}
.one{border:3px solid var(--ink);background:var(--ink);box-shadow:4px 4px 0 var(--accent)}
.badge.ai{background:#fffdf6;color:var(--ink)}
@media(max-width:720px){.lab-top h1{font-size:34px}.hero .in{grid-template-columns:1fr}.hero .im{min-height:0;aspect-ratio:16/9}.tools{grid-template-columns:1fr}.et{width:38px;height:44px}}

/* ===== v3: ヒーロー（おうちの化学ラボ） ===== */
.hero2{position:relative;background:#f6e9cf;border-bottom:4px solid var(--accent)}
.h2-stage{position:relative;max-width:1400px;margin:0 auto;line-height:0;overflow:hidden}
.h2-stage>img{display:block;width:100%;height:auto}
.h2-copy{position:absolute;z-index:3;left:24%;top:5%;width:52%;color:var(--ink);line-height:1.6}
.h2-copy .kick{color:#7a6a4c;font-size:14px;letter-spacing:.08em}
.h2-copy h1{font-size:clamp(34px,5.4vw,76px);margin:2px 0 4px;color:var(--ink);text-shadow:0 2px 0 #fff8e6}
.h2-copy h1 em{color:#1f8a7a;font-style:normal}
.h2-copy p{margin:0 0 10px;font-size:clamp(13px,1.45vw,19px);max-width:30em}
.h2-actions{display:flex;gap:14px;align-items:center;flex-wrap:wrap}
.btn2{font:inherit;font-weight:700;border:2px solid var(--ink);background:#fffdf6;color:var(--ink);border-radius:999px;padding:6px 18px;cursor:pointer;box-shadow:3px 3px 0 var(--ink);font-size:clamp(12px,1.2vw,16px)}
.btn2:hover{transform:translate(-1px,-1px);box-shadow:4px 4px 0 var(--ink)}
.h2-actions .stats{color:#7a6a4c;font-size:13px}
.hs{position:absolute;display:block;border-radius:14px;text-decoration:none;z-index:2;outline-offset:2px}
.hs:before{content:"";position:absolute;inset:-4px;border-radius:16px;border:3px solid transparent;transition:.15s}
.hs:hover:before,.hs:focus-visible:before{border-color:#fffdf6;background:rgba(255,253,246,.28);box-shadow:0 0 0 3px var(--ink),0 6px 18px rgba(60,40,10,.25)}
.hs .tg{position:absolute;left:50%;bottom:104%;transform:translateX(-50%) scale(.85);opacity:0;pointer-events:none;white-space:nowrap;background:var(--ink);color:#fffdf6;font:700 13px/1.4 "Zen Maru Gothic",sans-serif;padding:3px 11px;border-radius:999px;transition:.15s;z-index:4}
.hs:hover .tg,.hs:focus-visible .tg{opacity:1;transform:translateX(-50%) scale(1)}
.hs .pulse{position:absolute;left:50%;top:50%;width:14px;height:14px;margin:-7px;border-radius:50%;background:#fffdf6;border:3px solid #1f8a7a;animation:pl 2.6s infinite;opacity:.9}
.hs:hover .pulse{display:none}
@keyframes pl{0%{box-shadow:0 0 0 0 rgba(31,138,122,.55)}70%{box-shadow:0 0 0 14px rgba(31,138,122,0)}100%{box-shadow:0 0 0 0 rgba(31,138,122,0)}}
.fx{position:absolute;inset:0;pointer-events:none;z-index:1}
.bub{position:absolute;border-radius:50%;border:1.5px solid rgba(255,255,255,.95);background:radial-gradient(circle at 30% 30%,rgba(255,255,255,.9),rgba(255,255,255,.25));opacity:0;animation:rise var(--d,3s) linear infinite;animation-delay:var(--dl,0s)}
@keyframes rise{0%{transform:translateY(0) scale(.6);opacity:0}12%{opacity:.95}100%{transform:translateY(var(--h,-60px)) translateX(var(--dx,0)) scale(1.1);opacity:0}}
.steam{position:absolute;width:5.5%;aspect-ratio:1;border-radius:50%;background:radial-gradient(circle,rgba(255,255,255,.8),rgba(255,255,255,0) 70%);filter:blur(2px);opacity:0;animation:steam 4.4s ease-out infinite;animation-delay:var(--dl,0s)}
@keyframes steam{0%{transform:translate(0,0) scale(.5);opacity:0}20%{opacity:.8}100%{transform:translate(var(--dx,10px),-120%) scale(1.5);opacity:0}}
.flame{position:absolute;width:2.2%;aspect-ratio:.55;border-radius:50% 50% 50% 50%/70% 70% 30% 30%;background:radial-gradient(ellipse at 50% 70%,rgba(255,226,120,.9),rgba(255,160,60,.35) 60%,transparent 75%);filter:blur(1.5px);animation:fl .9s ease-in-out infinite alternate;transform-origin:50% 90%}
@keyframes fl{0%{transform:scale(1,1) rotate(-3deg);opacity:.75}100%{transform:scale(1.12,1.2) rotate(3deg);opacity:1}}
.hs.pop{animation:popk .35s}
@keyframes popk{50%{transform:scale(1.08)}}
@media(prefers-reduced-motion:reduce){.bub,.steam,.flame,.hs .pulse{animation:none}.bub{opacity:.7}}
@media(max-width:760px){
 .h2-copy{position:static;width:auto;padding:20px 18px 10px;background:#f6e9cf}
 .h2-copy h1{font-size:40px}
 .h2-copy p{font-size:14px}
 .hs .tg{font-size:11px;padding:2px 8px}
 .hs .pulse{width:8px;height:8px;margin:-4px;border-width:2px;animation:none;box-shadow:none}
}

.tools{grid-template-columns:repeat(auto-fit,minmax(230px,1fr))}

/* ===== v4: コラム（読み物） ===== */
.cwrap.col{max-width:680px;font-size:18px;line-height:2.15}
.col .lede{font-size:20px;line-height:2;color:var(--ink);font-family:"Shippori Mincho",serif;font-weight:600;border-left:5px solid var(--accent);padding:4px 0 4px 18px;margin:10px 0 34px}
.col .cs{margin:44px 0}
.col .cs h2{font-size:26px;line-height:1.5;margin:0 0 16px;border:0;padding:0;display:block}
.col .cs h2:before{content:"";display:block;width:44px;height:4px;background:var(--accent);margin-bottom:12px;border-radius:2px}
.col .cs p{margin:0 0 1.3em;text-align:justify;text-justify:inter-ideograph}
.col .cs:first-of-type>p:first-of-type:first-letter{float:left;font:800 3.4em/1 "Shippori Mincho",serif;color:var(--accent);padding:6px 10px 0 0}
.col figure.fig{margin:26px -20px}
.hitokuchi{background:#fff6d8;border:2px dashed #d8b84a;border-radius:14px;padding:16px 22px;margin:40px 0;font-size:16.5px;line-height:2}
.hitokuchi b{display:inline-block;background:#d49a1f;color:#fff;border-radius:999px;padding:0 14px;font-size:13px;margin-bottom:6px}
.hitokuchi p{margin:0}
.col .emg{margin:44px 0 30px}
.col .closing{font-family:"Shippori Mincho",serif;font-size:19px;line-height:2.1;border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:26px 4px;margin:44px 0;color:var(--ink)}
.colhero h1{font-size:clamp(28px,4vw,40px);line-height:1.5}
@media(max-width:720px){.cwrap.col{font-size:17px;line-height:2.05}.col figure.fig{margin:22px 0}.col .cs h2{font-size:23px}}

/* v5 カテゴリ見出し */
.psec{margin:34px 0 8px;scroll-margin-top:12px}
.phead{display:flex;align-items:center;gap:10px;margin:0 0 14px;padding-bottom:8px;border-bottom:2px solid var(--accent);color:var(--ink);font-size:1.35rem}
.phead svg{width:1.3em;height:1.3em;color:var(--accent)}
.phead small{margin-left:auto;font-size:.8rem;font-weight:400;color:#6b7a80}
a.chip{text-decoration:none;color:inherit}

.intro{max-width:44rem;margin:26px auto 22px;padding:22px 26px;background:var(--paper);border-left:4px solid var(--accent);border-radius:6px;box-shadow:0 1px 0 rgba(0,0,0,.05)}
.intro .kick{font-size:.8rem;letter-spacing:.12em;color:var(--accent);font-weight:700}
.intro h2{margin:4px 0 12px;font-size:1.5rem;color:var(--ink)}
.intro p{line-height:2;margin:0 0 .9em;color:var(--ink)}
.intro p:last-child{margin-bottom:0}

.feat{max-width:60rem;margin:26px auto 10px}
.feat .kick{font-size:.8rem;letter-spacing:.12em;color:var(--accent);font-weight:700}
.feat h2{margin:2px 0 14px;font-size:1.5rem;color:var(--ink)}
.featlist{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px}
.fcard{display:flex;flex-direction:column;gap:6px;padding:16px 18px;background:var(--paper);border-top:3px solid var(--accent);border-radius:6px;text-decoration:none;color:var(--ink);box-shadow:0 1px 3px rgba(0,0,0,.08)}
.fcard .fno{font-size:.75rem;color:var(--accent);font-weight:700}
.fcard b{font-size:1.08rem;line-height:1.5}
.fcard span:last-child{font-size:.85rem;line-height:1.7;color:#4a5a60}
@media(min-width:1000px){.featlist{grid-template-columns:repeat(5,1fr)}}

.report{max-width:44rem;margin:28px auto 0;padding:0 16px;font-size:.85rem;color:#4a5a60;text-align:center}
.report a{color:var(--accent)}