/* Atlas 使い方ガイド — LP (/atlas-lp/index.html) の色・書体・ボタンをそのまま使う */
:root{
  --ink:#10151f;--ink-2:#4a5263;--ink-3:#8a91a0;
  --paper:#f6f5f1;--paper-2:#ecebe5;--line:#dbd8cf;
  --deep:#070f1f;--deep-2:#0d1a33;--deep-3:#132546;
  --dl:rgba(255,255,255,.1);--dl2:rgba(255,255,255,.18);
  --sea:#22b0d4;--sea-2:#7fdcf0;--gold:#d4b268;--ok:#41b878;--warn:#e0a94a;
  --serif:'Shippori Mincho B1','Hiragino Mincho ProN','Yu Mincho',serif;
  --sans:'Noto Sans JP','Hiragino Kaku Gothic ProN','Yu Gothic',sans-serif;
  --w:1080px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--sans);color:var(--ink);background:var(--paper);line-height:1.85;font-size:16px;-webkit-font-smoothing:antialiased;overflow-x:hidden}
img,svg{display:block;max-width:100%}
a{color:#158ba8;text-decoration:underline;text-underline-offset:3px}
:focus-visible{outline:2px solid var(--sea);outline-offset:3px}
.wrap{width:min(var(--w),calc(100% - 32px));margin:0 auto}
h1,h2,h3{font-weight:700;line-height:1.4}

/* header (LP と同じ見た目・常に solid) */
.hdr{position:sticky;top:0;z-index:60;padding:14px 0;background:rgba(7,15,31,.92);backdrop-filter:blur(12px);border-bottom:1px solid var(--dl);color:#fff}
.hdr .wrap{display:flex;align-items:center;justify-content:space-between;gap:12px}
.brand{display:flex;align-items:center;gap:10px;font-family:var(--serif);font-size:21px;letter-spacing:.08em;color:#fff;text-decoration:none}
.brand .mark{width:30px;height:30px}
.brand small{font-family:var(--sans);font-size:12px;letter-spacing:.04em;color:var(--sea-2);margin-left:4px}
.hdr nav{display:flex;gap:22px;font-size:14px}
.hdr nav a{color:rgba(255,255,255,.78);text-decoration:none}
.hdr nav a:hover{color:#fff}
@media(max-width:700px){.hdr nav a.opt{display:none}.hdr nav{gap:14px}}

/* hero */
.ghero{background:linear-gradient(180deg,var(--deep),var(--deep-2));color:#fff;padding:64px 0 56px}
.kicker{font-family:var(--serif);color:var(--sea);font-size:14px;letter-spacing:.14em;margin-bottom:10px}
.ghero h1{font-family:var(--serif);font-size:clamp(28px,4.6vw,44px)}
.ghero .lead{color:rgba(255,255,255,.72);max-width:42em;margin-top:14px;font-size:16px}
.crumb{font-size:13px;color:rgba(255,255,255,.6);margin-bottom:14px}
.crumb a{color:rgba(255,255,255,.8)}

main{padding:48px 0 80px}
main section{margin-top:44px}
main section:first-child{margin-top:0}
main h2{font-family:var(--serif);font-size:clamp(22px,3vw,28px);padding-bottom:10px;border-bottom:1px solid var(--line);margin-bottom:18px}
main h3{font-size:18px;margin:26px 0 10px}
main p{margin-top:10px;color:var(--ink)}
main ul,main ol{margin:12px 0 0 1.4em}
main li{margin-top:6px}

/* menu path */
.path{display:inline-block;font-size:14px;background:var(--deep);color:#fff;padding:4px 12px;border-radius:999px;margin:2px 0}
.ui{display:inline-block;font-size:.92em;padding:0 7px;border:1px solid var(--line);border-radius:6px;background:#fff;white-space:nowrap}

/* steps */
ol.steps{list-style:none;margin:16px 0 0;counter-reset:s}
ol.steps>li{counter-increment:s;position:relative;padding:16px 18px 16px 62px;margin-top:12px;background:#fff;border:1px solid var(--line);border-radius:14px}
ol.steps>li::before{content:counter(s);position:absolute;left:16px;top:14px;width:32px;height:32px;border-radius:50%;background:var(--sea);color:#fff;font-family:var(--serif);font-weight:700;display:grid;place-items:center}
ol.steps>li b.t{display:block;font-size:16px}

/* screenshot placeholder */
.shot{margin-top:12px;border:1px dashed var(--ink-3);border-radius:10px;padding:18px;text-align:center;color:var(--ink-3);font-size:13px;background:var(--paper-2)}

/* callouts */
.box{margin-top:16px;padding:16px 18px;border-radius:12px;border:1px solid var(--line);background:#fff}
.box.tip{border-left:5px solid var(--sea)}
.box.warn{border-left:5px solid var(--warn);background:#fffaf0}
.box b.h{display:block;margin-bottom:4px}

/* faq (LP と同じ details) */
.faq{border-top:1px solid var(--ink);margin-top:8px}
.faq details{border-bottom:1px solid var(--line)}
.faq summary{list-style:none;cursor:pointer;padding:18px 40px 18px 0;font-weight:500;position:relative}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"";position:absolute;right:8px;top:50%;width:9px;height:9px;border-right:1.5px solid var(--ink);border-bottom:1.5px solid var(--ink);transform:translateY(-70%) rotate(45deg);transition:.25s}
.faq details[open] summary::after{transform:translateY(-30%) rotate(225deg)}
.faq details p{padding:0 0 18px;color:var(--ink-2);margin:0}

/* index cards */
.cat{margin-top:40px}
.cat h2{display:flex;align-items:baseline;gap:12px}
.cat h2 small{font-family:var(--sans);font-size:13px;color:var(--ink-3);font-weight:400}
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.card{display:flex;flex-direction:column;padding:20px;border:1px solid var(--line);border-radius:16px;background:#fff;color:var(--ink);text-decoration:none;transition:.2s}
.card:hover{border-color:var(--sea);box-shadow:0 10px 24px rgba(7,15,31,.08)}
.card b{font-size:16px}
.card span{font-size:13.5px;color:var(--ink-2);margin-top:6px}
.card i{font-style:normal;font-size:12px;color:#158ba8;margin-top:auto;padding-top:10px}
@media(max-width:900px){.cards{grid-template-columns:1fr 1fr}}
@media(max-width:560px){.cards{grid-template-columns:1fr}}

/* toc */
.toc{padding:16px 18px;background:#fff;border:1px solid var(--line);border-radius:12px;font-size:14px}
.toc ol{margin:6px 0 0 1.3em}

/* table */
.tbl{overflow-x:auto;margin-top:12px}
.tbl table{border-collapse:collapse;width:100%;min-width:520px;font-size:14px;background:#fff}
.tbl th,.tbl td{border:1px solid var(--line);padding:10px 12px;text-align:left;vertical-align:top}
.tbl th{background:var(--paper-2);font-weight:500}

.pager{display:flex;justify-content:space-between;gap:12px;margin-top:56px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:8px;padding:13px 24px;border-radius:999px;font-weight:700;text-decoration:none;white-space:nowrap}
.btn-primary{background:var(--sea);color:#fff}
.btn-primary:hover{background:#1b94b3}
.btn-outline{border:1px solid var(--ink);color:var(--ink)}
.btn-outline:hover{background:var(--ink);color:#fff}

footer{background:#040a17;color:rgba(255,255,255,.55);padding:36px 0 48px;font-size:13px}
footer .wrap{display:flex;flex-wrap:wrap;justify-content:space-between;gap:16px;align-items:center}
footer nav{display:flex;gap:20px;flex-wrap:wrap}
footer a{color:rgba(255,255,255,.7);text-decoration:none}
footer a:hover{color:#fff}
@media(prefers-reduced-motion:reduce){*{transition:none!important}html{scroll-behavior:auto}}