/* Excel やさしい練習帳 */
:root{--g:#1f7a4d;--g2:#2f9e5b;--mint:#e9f6ee;--cream:#fffaf0;--y:#f2c14e;--coral:#ee7d6a;--ink:#183326;--sub:#4b5e53;--line:#d6e6dc;--r:22px}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:70px;-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:var(--ink);background:#fbfdf9;line-height:1.8;font-size:16px}
.wrap{max-width:1120px;margin:0 auto;padding:0 24px}
a{color:var(--g)}button{font:inherit;color:inherit}
:focus-visible{outline:3px solid var(--y);outline-offset:3px;border-radius:6px}
.skip{position:absolute;left:-999px;top:8px;background:#fff;padding:8px 14px;border-radius:8px;z-index:20}.skip:focus{left:12px}
[hidden]{display:none!important}
.top{position:sticky;top:0;z-index:10;background:rgba(251,253,249,.88);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-bottom:1px solid rgba(0,0,0,.06)}
.top .wrap{display:flex;align-items:center;gap:18px;min-height:60px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;text-decoration:none;color:var(--ink);white-space:nowrap}
.mark{width:26px;height:26px;border-radius:8px;background:linear-gradient(135deg,var(--g2),var(--g));box-shadow:inset 0 0 0 4px rgba(255,255,255,.35);display:inline-block;position:relative}
.mark::after{content:"";position:absolute;inset:7px;border:2px solid rgba(255,255,255,.9);border-width:2px 0;}
.top nav{display:flex;gap:2px;overflow-x:auto;margin-left:auto;scrollbar-width:none}.top nav::-webkit-scrollbar{display:none}
.top nav a{white-space:nowrap;text-decoration:none;color:#4a5550;font-size:14px;padding:6px 11px;border-radius:999px}.top nav a:hover{background:var(--mint);color:var(--g)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:0;background:var(--g);color:#fff;font-weight:700;padding:12px 24px;border-radius:999px;cursor:pointer;text-decoration:none;box-shadow:0 10px 22px -12px var(--g);transition:transform .2s}
.btn:hover{transform:translateY(-2px)}.btn.ghost{background:#fff;color:var(--g);box-shadow:inset 0 0 0 1.5px var(--g)}
.hero{padding:56px 0 72px;background:radial-gradient(800px 420px at 90% 0%,#dff2e6,transparent 60%),radial-gradient(600px 400px at 0% 100%,#fff3d6,transparent 60%),var(--cream)}
.hero-grid{display:grid;grid-template-columns:1fr 1.1fr;gap:44px;align-items:center}
.eyebrow{display:inline-block;background:#fff;color:var(--g);font-weight:700;font-size:13px;letter-spacing:.08em;padding:4px 14px;border-radius:999px;margin:0 0 14px}
h1{font-size:clamp(38px,6vw,64px);line-height:1.12;margin:0 0 18px;letter-spacing:-.02em}h1 em{font-style:normal;color:var(--g2)}
.lead{font-size:17px;color:#3a4a41;margin:0 0 24px;max-width:30em}
.cta{display:flex;gap:12px;flex-wrap:wrap;margin-bottom:22px}
.stats{list-style:none;padding:0;margin:0;display:flex;gap:10px;flex-wrap:wrap}.stats li{background:#fff;border-radius:16px;padding:8px 16px;display:flex;gap:6px;align-items:baseline;box-shadow:0 1px 0 rgba(0,0,0,.05)}
.stats b{font-size:24px;color:var(--g)}.stats span{font-size:13px;color:var(--sub);font-weight:600}
.hero-art{margin:0;border-radius:28px;overflow:hidden;box-shadow:0 30px 60px -30px rgba(0,0,0,.4)}.hero-art img,.art img,.course img{display:block;width:100%;height:auto}
.sec{padding:84px 0}.sec.band{background:#fff}
.sh{display:flex;gap:18px;align-items:flex-start;margin-bottom:30px}.sn{font-size:44px;font-weight:800;color:transparent;-webkit-text-stroke:1.5px var(--g2);line-height:1;min-width:58px}
.sh h2{margin:0;font-size:clamp(24px,3vw,32px);letter-spacing:-.01em}.sh p{margin:6px 0 0;color:var(--sub)}
.split{display:grid;grid-template-columns:.85fr 1.15fr;gap:30px;align-items:start}
.art{margin:0;border-radius:var(--r);overflow:hidden;box-shadow:0 22px 44px -30px rgba(0,0,0,.45)}
.lab{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:22px;box-shadow:0 18px 40px -32px rgba(0,0,0,.35)}
.band .lab{background:var(--cream)}
.qtxt{font-size:18px;font-weight:700;margin:0 0 6px}.qtxt b{color:var(--g2);font-size:24px}
.fb{min-height:28px;color:var(--sub);margin:4px 0 10px}.score{margin:0 0 12px;font-weight:700}.score b{color:var(--g)}
.grid-wrap{margin-top:14px;overflow-x:auto}
table.xl{border-collapse:collapse;font-size:14px;background:#fff}
.xl th{background:#eef5f0;color:#55675c;font-weight:600;border:1px solid var(--line);padding:4px 8px;min-width:30px;text-align:center}
.xl td{border:1px solid var(--line);padding:6px 10px}
#cell-grid td{padding:0}.cellbtn{display:block;width:58px;height:34px;border:0;background:#fff;cursor:pointer;transition:background .15s}
.cellbtn:hover{background:var(--mint)}.cellbtn.ok{background:var(--g2);box-shadow:inset 0 0 0 2px var(--g)}.cellbtn.ng{background:#fde2dc}
.fx{display:flex;align-items:center;gap:10px;background:#f4f8f5;border:1px solid var(--line);border-radius:10px;padding:6px 12px;margin-bottom:12px;font-family:ui-monospace,Menlo,monospace}
.fx-l{font-style:italic;color:var(--g);font-weight:700}.fx code.flash{animation:fl .6s}
@keyframes fl{0%{background:#fff3c4}100%{background:transparent}}
.calc-t{width:100%}.num{text-align:right;font-variant-numeric:tabular-nums}.calc-t .hdr td{font-weight:700;background:#f8fbf9}
.qty{white-space:nowrap}.qb{width:26px;height:26px;border-radius:50%;border:1px solid var(--line);background:#fff;cursor:pointer;font-weight:800;color:var(--g)}.qv{display:inline-block;min-width:26px;text-align:center;font-weight:700}
.amt{cursor:pointer}.total td{font-weight:800;background:#fbf6e6}
.calc-out{margin-top:12px}.calc-out p{margin:4px 0}.calc-out code{background:#f4f8f5;padding:2px 6px;border-radius:6px;font-size:13px}.calc-out b{color:var(--g)}
.fmt-cell{display:grid;grid-template-columns:auto 1fr;gap:6px 12px;align-items:center;margin-bottom:14px}
.fmt-label{font-size:12px;color:var(--sub);font-weight:700}#fmt-out{display:block;font-size:34px;font-weight:800;border:2px solid var(--g2);border-radius:10px;padding:8px 14px;background:#fff;font-variant-numeric:tabular-nums;text-align:right}
.fmt-raw{grid-column:2;font-size:13px;color:var(--sub)}
.chips{display:flex;gap:8px;flex-wrap:wrap;margin:8px 0}.chip{border:1.5px solid var(--line);background:#fff;border-radius:999px;padding:6px 14px;font-weight:700;cursor:pointer;font-size:14px}
.chip.on{background:var(--g);border-color:var(--g);color:#fff}.chip.ok{background:#e3f5ea;border-color:var(--g2);color:#1d6b3c}.chip.ng{background:#fde8e3;border-color:var(--coral);color:#9a3b2b}
.tip{font-size:14px;color:var(--sub);margin:10px 0 0}
#chartsvg{width:100%;height:auto;background:#fff;border:1px solid var(--line);border-radius:14px;margin:8px 0 12px}
#chartsvg .gl{stroke:#e8efe9}#chartsvg .lb{font-size:13px;fill:#5b6b61}#chartsvg .bar{fill:var(--g2)}#chartsvg .ln{fill:none;stroke:var(--coral);stroke-width:4;stroke-linecap:round;stroke-linejoin:round}#chartsvg .dot{fill:#fff;stroke:var(--coral);stroke-width:3}
.list{width:100%;margin-top:8px}.sumline{margin:10px 0 0;font-size:14px}.sumline b{color:var(--g);font-size:18px}.sumline code{font-size:12px}
.relcourse{display:flex;flex-wrap:wrap;align-items:baseline;gap:6px 14px;margin-top:22px;padding:14px 20px;border-radius:16px;background:linear-gradient(90deg,var(--mint),#fff8e6);text-decoration:none;color:var(--ink);border:1px solid var(--line)}
.rc-k{font-size:12px;font-weight:700;color:var(--g)}.relcourse b{font-size:16px}.rc-go{margin-left:auto;font-weight:700;color:var(--g)}
.note{font-size:13px;color:var(--sub)}
.tabs{display:flex;gap:8px;flex-wrap:wrap;margin:10px 0 18px}.tab{border:0;background:var(--mint);border-radius:14px;padding:8px 14px;font-weight:700;cursor:pointer;color:var(--g)}.tab[aria-selected="true"]{background:var(--g);color:#fff}
.vlead{font-weight:700;margin:0 0 12px}.vids{list-style:none;padding:0;margin:0 0 18px;display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:12px}
.vid{background:var(--cream);border-radius:16px;padding:10px;display:flex;flex-direction:column;gap:8px}
.vthumb{position:relative;aspect-ratio:16/9;border:0;border-radius:12px;background:linear-gradient(135deg,var(--g2),var(--g));cursor:pointer;color:#fff}
.vthumb:disabled{background:#cfd8d2;cursor:default}.vno{position:absolute;left:10px;top:8px;font-size:12px;font-weight:800;background:rgba(0,0,0,.25);padding:1px 8px;border-radius:999px}
.vplay{display:inline-grid;place-items:center;width:46px;height:46px;border-radius:50%;background:rgba(255,255,255,.95);color:var(--g);font-size:16px}
.vt{font-size:13.5px;font-weight:600;line-height:1.5}.vframe iframe{width:100%;aspect-ratio:16/9;border:0;border-radius:12px}
.vid.playing{grid-column:1/-1}.vid.playing .vthumb{display:none}.soon{color:var(--sub)}
.coupon{display:inline-flex;gap:10px;align-items:center;background:#fff8e1;border:1px solid #f1dd9b;border-radius:999px;padding:6px 16px 6px 6px;font-weight:600;font-size:14px;margin:0 0 20px}
.coupon span{background:var(--g);color:#fff;border-radius:999px;padding:4px 12px;font-family:ui-monospace,Menlo,monospace;letter-spacing:.1em;font-size:12px}
.courses{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}
.course{background:#fff;border:1px solid var(--line);border-radius:var(--r);overflow:hidden;display:flex;flex-direction:column;box-shadow:0 18px 40px -34px rgba(0,0,0,.4)}
.cbody{padding:16px 18px 20px;display:flex;flex-direction:column;gap:8px;flex:1}.cno{font-size:12px;font-weight:800;color:var(--g2)}.course h3{margin:0;font-size:17px;line-height:1.45}.course p{margin:0;font-size:14px;color:var(--sub)}.course .btn{margin-top:auto}
footer{background:#14281d;color:#cfe0d5;padding:40px 0;font-size:13px}footer .f-brand{color:#fff;font-weight:800;display:flex;gap:10px;align-items:center;font-size:15px}
.js .reveal{opacity:0;transform:translateY(18px);transition:opacity .6s,transform .6s}.js .reveal.in{opacity:1;transform:none}
@media (max-width:980px){.hero-grid,.split{grid-template-columns:1fr}.courses{grid-template-columns:1fr 1fr}}
@media (max-width:640px){.wrap{padding:0 18px}.sec{padding:60px 0}.courses{grid-template-columns:1fr}.cellbtn{width:46px}.top nav a{font-size:13px;padding:6px 8px}.sn{font-size:34px;min-width:44px}.rc-go{margin-left:0}.xl td{padding:5px 6px}}
@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}html{scroll-behavior:auto}}
.vsoon{display:inline-block;font-size:12px;font-weight:700;color:#4b5e53;background:rgba(255,255,255,.9);padding:4px 12px;border-radius:999px}