:root { --ink:#252525; --muted:#555555; --line:#dededb; --paper:#fafaf9; --accent:#14213d; --mint:#e5f3e8; --mint-ink:#176b35; }
* { box-sizing:border-box; }
body { margin:0; color:var(--ink); background:var(--paper); font:16px/1.6 Arial, Helvetica, sans-serif; }
main, footer { max-width:1080px; margin:auto; padding-left:28px; padding-right:28px; }
nav { min-height:92px; display:flex; align-items:center; justify-content:space-between; }
a { color:inherit; text-underline-offset:3px; }
.brand { display:inline-flex; align-items:center; font-weight:800; text-decoration:none; letter-spacing:-.04em; font-size:1.15rem; }.brand-mark { display:inline-block; width:23px; height:26px; margin-right:8px; text-align:center; color:white; background:#252d37; border-radius:5px; font:700 29px/26px Georgia, serif; }.brand-accent { color:var(--accent); }.brand-name { font-weight:400; }.google-sheet { color:rgb(15,157,88); }
/* Wordmark: RekodJa — reusable in header and footer */
.wordmark{display:inline;font-family:"Times New Roman",Times,serif;font-weight:700;font-style:normal;color:#000;white-space:nowrap;letter-spacing:normal}
.wordmark-ja{font-weight:400;font-style:italic;color:#0061e9;letter-spacing:normal}
.hero { padding:88px 0 82px; max-width:800px; }.eyebrow,.number { color:var(--accent); font-weight:800; letter-spacing:.11em; text-transform:uppercase; font-size:.73rem; }
h1,h2 { line-height:1.08; letter-spacing:-.055em; margin:0; } h1 { font-size:clamp(3rem,8vw,6.25rem); } h2 { font-size:clamp(1.9rem,4vw,3.2rem); }
.lede { font-size:1.18rem; color:var(--muted); max-width:610px; margin:30px 0; }.button { display:inline-block; color:white; background:var(--accent); text-decoration:none; padding:13px 19px; border-radius:6px; font-weight:700; }
.grid { display:grid; grid-template-columns:repeat(3,1fr); background:white; border:1px solid var(--line); border-radius:6px; overflow:hidden; }.grid article { padding:32px; }.grid article+article { border-left:1px solid var(--line); }.grid h2 { font-size:1.35rem; letter-spacing:-.03em; }.grid p:not(.number),.data>p { color:var(--muted); }
.data { display:grid; grid-template-columns:1fr 1fr; gap:72px; margin:88px 0; align-items:center; }.data h2 { font-size:2.4rem; }.data>p { margin:0; }
footer { min-height:100px; border-top:1px solid var(--line); display:flex; justify-content:space-between; align-items:center; color:var(--muted); font-size:.9rem; } footer > span:last-child { display:flex; gap:20px; }
.legal { max-width:780px; padding-top:52px; padding-bottom:72px; }.legal h1 { font-size:clamp(2.7rem,6vw,4.6rem); }.legal h2 { font-size:1.38rem; letter-spacing:-.03em; margin-top:42px; }.legal p,.legal li { color:var(--muted); }.legal .updated { margin-top:10px; color:var(--muted); }
.tutorial { scroll-margin-top:28px; }
.tutorial-heading { max-width:740px; margin-bottom:32px; }
.tutorial-heading>p:last-child,.tutorial-steps p { color:var(--muted); }
.tutorial-steps { list-style:none; counter-reset:tutorial; padding:0; margin:0; display:grid; gap:20px; }
.tutorial-steps>li { counter-increment:tutorial; position:relative; padding:32px 32px 32px 92px; background:white; border:1px solid var(--line); border-radius:6px; min-width:0; }
.tutorial-steps>li::before { content:counter(tutorial, decimal-leading-zero); position:absolute; left:28px; top:28px; width:42px; height:42px; display:grid; place-items:center; border-radius:50%; background:transparent; border:2px solid #000; color:#000; font-size:.85rem; font-weight:800; }
.tutorial-steps h3 { margin:2px 0 12px; font-size:1.35rem; line-height:1.3; letter-spacing:-.03em; }
.tutorial-steps p { margin:12px 0 0; }
.tutorial-steps strong { color:var(--ink); }
.tutorial-steps p a { color:var(--accent); }
.sheet-example { padding:16px; background:var(--paper); border:1px solid rgba(0,0,0,0.7); border-radius:6px; }
.sheet-example span { display:block; margin-bottom:8px; font-size:.85rem; }
.sheet-example code { font-size:.85rem; overflow-wrap:anywhere; }
.sheet-example mark { background:var(--mint); color:var(--mint-ink); font-weight:700; }
.tutorial-steps figure { margin:24px 0 0; }
.tutorial-steps figure a { display:block; border:1px solid var(--line); border-radius:6px; overflow:hidden; position:relative; }
.tutorial-steps img { display:block; width:100%; height:auto; }
.tutorial-steps figure a > .shot-cursor { position:absolute; width:52px; height:auto; pointer-events:none; filter:drop-shadow(0 3px 4px rgba(0,0,0,.35)); transform:translate(-21px,-2px); }
.compare { display:grid; grid-template-columns:1fr 1fr; gap:16px; margin-top:24px; }
.compare-item { position:relative; margin:0; }
.compare .compare-item { margin:0; }
.compare-badge { position:absolute; top:10px; left:10px; z-index:1; padding:4px 10px; border-radius:999px; color:white; font-size:.78rem; font-weight:800; }
.badge-correct { background:#176b35; }
.badge-wrong { background:#982b2b; }
.compare-item figcaption { margin-top:8px; color:var(--muted); font-size:.85rem; }
.video { margin-top:16px; }
.video iframe { display:block; width:100%; max-width:280px; aspect-ratio:9/16; border:1px solid var(--line); border-radius:6px; }
.tutorial-steps figcaption { margin-top:10px; color:var(--muted); font-size:.85rem; }
a:focus-visible { outline:3px solid var(--accent); outline-offset:4px; }
@media (max-width:700px) { .tutorial-steps>li { padding:24px 20px; }.tutorial-steps>li::before { position:static; margin-bottom:16px; }.tutorial-heading { margin-bottom:24px; }.compare { grid-template-columns:1fr; } }
@media (max-width:700px) { main,footer { padding-left:20px; padding-right:20px; }.hero { padding:55px 0; }.grid,.data { grid-template-columns:1fr; }.grid article+article { border-left:0; border-top:1px solid var(--line); }.data { gap:22px; margin:55px 0; } footer { padding-top:24px; padding-bottom:24px; align-items:flex-start; flex-direction:column; gap:12px; } }