/* NicoVault guides – matches the dark theme of nicovault.com */
:root{
  --bg:#0b1222; --bg-2:#060d1d; --card:#111b30; --line:#1a2846;
  --text:#e6ecf7; --head:#e8eefb; --muted:#9fb0cf; --accent:#5b8dff; --accent-2:#b4dbff;
  --good:#3ecf8e; --warn:#f5b94a; --bad:#ff6b6b;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--text);font-family:"Public Sans","Segoe UI",system-ui,sans-serif;font-size:17px;line-height:1.65}
a{color:var(--accent-2)}
a:hover{color:#fff}
.wrap{max-width:1160px;margin:0 auto;padding:0 16px}

/* header */
.top{position:sticky;top:0;z-index:10;background:rgba(6,13,29,.92);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.top .wrap{display:flex;align-items:center;gap:24px;height:64px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--head)}
.brand .mark{width:34px;height:34px;border-radius:9px;background:linear-gradient(145deg,#3b7bff,#1f5fe0);display:grid;place-items:center;flex:none}
.brand b{display:block;font-size:16px;line-height:1.1}
.brand small{display:block;font-size:12px;color:var(--accent-2);line-height:1.2}
.top nav{display:flex;gap:20px;margin-left:auto;align-items:center}
.top nav a{color:var(--muted);text-decoration:none;font-size:15px}
.top nav a:hover{color:#fff}
.top nav a.btn{color:#fff}
@media (max-width:760px){.top nav a.hide-sm{display:none}}

.btn{display:inline-block;background:var(--accent);color:#fff;text-decoration:none;font-weight:600;font-size:16px;border-radius:10px;padding:13px 20px;line-height:1.2}
.btn:hover{background:#4a7cf0;color:#fff}
.btn.ghost{background:transparent;border:1px solid var(--line);color:var(--head)}
.btn.ghost:hover{border-color:var(--accent)}
.btn.sm{padding:9px 14px;font-size:15px}

/* article */
.crumbs{font-size:14px;color:var(--muted);margin:28px 0 0}
.crumbs a{color:var(--muted);text-decoration:none}
.crumbs a:hover{color:#fff}
article{max-width:760px;margin:0 auto;padding:8px 0 40px}
.eyebrow{font-size:12px;letter-spacing:.12em;text-transform:uppercase;color:var(--accent);font-weight:600;margin:28px 0 10px}
h1{font-size:44px;line-height:1.1;font-weight:800;letter-spacing:-.01em;color:var(--head);margin:0 0 18px}
h2{font-size:28px;line-height:1.2;font-weight:700;color:var(--head);margin:48px 0 14px}
h3{font-size:20px;line-height:1.3;font-weight:700;color:var(--head);margin:28px 0 8px}
p{margin:0 0 16px}
.lead{font-size:19px;color:var(--muted)}
.meta{font-size:14px;color:var(--muted);margin:-4px 0 26px}
ul,ol{padding-left:22px;margin:0 0 18px}
li{margin:6px 0}
strong{color:var(--head)}
code,kbd{font-family:Consolas,"Cascadia Mono",monospace;font-size:15px;background:#0a1530;border:1px solid var(--line);border-radius:6px;padding:1px 6px;color:var(--accent-2)}
pre{background:#0a1530;border:1px solid var(--line);border-radius:10px;padding:14px 16px;overflow-x:auto;margin:0 0 18px}
pre code{background:none;border:0;padding:0;font-size:15px}

.box{background:var(--card);border-radius:14px;padding:22px 24px;margin:24px 0}
.box h2,.box h3{margin-top:0}
.box.alert{border-left:4px solid var(--warn)}
.box ol,.box ul{margin-bottom:0}

.steps{counter-reset:s;list-style:none;padding:0}
.steps>li{counter-increment:s;position:relative;padding-left:48px;margin:18px 0}
.steps>li::before{content:counter(s);position:absolute;left:0;top:0;width:32px;height:32px;border-radius:50%;background:#16264a;color:var(--accent-2);font-weight:700;display:grid;place-items:center;font-size:15px}

table{width:100%;border-collapse:collapse;margin:8px 0 22px;font-size:16px}
th,td{text-align:left;padding:11px 12px;border-bottom:1px solid var(--line);vertical-align:top}
th{color:var(--muted);font-weight:600;font-size:14px;text-transform:uppercase;letter-spacing:.06em}
.tag{display:inline-block;font-size:13px;font-weight:700;border-radius:999px;padding:2px 10px;white-space:nowrap}
.tag.good{background:rgba(62,207,142,.14);color:var(--good)}
.tag.mid{background:rgba(245,185,74,.14);color:var(--warn)}
.tag.bad{background:rgba(255,107,107,.14);color:var(--bad)}
@media (max-width:600px){table,thead,tbody,tr,th,td{display:block}thead{display:none}tr{border-bottom:1px solid var(--line);padding:8px 0}td{border:0;padding:4px 0}}

details{background:var(--card);border-radius:12px;padding:0 20px;margin:10px 0}
summary{cursor:pointer;padding:16px 0;font-weight:600;color:var(--head);list-style:none}
summary::-webkit-details-marker{display:none}
summary::after{content:"+";float:right;color:var(--accent);font-weight:700}
details[open] summary::after{content:"–"}
details>div{padding:0 0 16px;color:var(--text)}

.cta{background:linear-gradient(160deg,#13244a,#0f1a33);border:1px solid var(--line);border-radius:16px;padding:28px;margin:40px 0}
.cta h2{margin:0 0 8px;font-size:26px}
.cta p{color:var(--muted)}
.cta .row{display:flex;gap:12px;flex-wrap:wrap;margin-top:6px}
.cta small{display:block;color:var(--muted);font-size:14px;margin-top:14px}

.related{border-top:1px solid var(--line);margin-top:44px;padding-top:8px}
.related ul{list-style:none;padding:0}
.related li{margin:10px 0}

/* guides index */
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:16px;margin:24px 0 40px}
.cards a{display:block;background:var(--card);border-radius:14px;padding:22px;text-decoration:none;color:var(--text);border:1px solid transparent}
.cards a:hover{border-color:var(--accent)}
.cards b{display:block;color:var(--head);font-size:19px;line-height:1.3;margin-bottom:8px}
.cards span{color:var(--muted);font-size:15px}

footer{background:var(--bg-2);color:var(--muted);font-size:14px;padding:30px 0 40px;margin-top:20px}
footer .wrap{display:flex;flex-wrap:wrap;gap:18px 24px;align-items:center}
footer a{color:var(--muted);text-decoration:none}
footer a:hover{color:#fff}
footer .sp{margin-left:auto}

@media (max-width:600px){
  h1{font-size:32px}
  h2{font-size:24px}
  body{font-size:16px}
  .lead{font-size:17px}
  .top nav{gap:14px}
}