:root{
  --bg:#0a0605;--bg2:#140a08;--panel:#1a0e0b;
  --gold:#d8b768;--gold-bright:#f1da9a;--gold-deep:#9c7c3a;
  --crimson:#a31f1f;--crimson-deep:#6e1313;--rose:#c0354a;
  --ink:#f4ece0;--muted:#b6a892;--line:rgba(216,183,104,.22);
  --serif:"Shippori Mincho B1",serif;--gothic:"Zen Kaku Gothic New",sans-serif;
  --display:"Cinzel",serif;--garamond:"Cormorant Garamond",serif;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--ink);font-family:var(--gothic);line-height:1.9;letter-spacing:.03em;overflow-x:hidden;-webkit-font-smoothing:antialiased}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
.wrap{max-width:860px;margin:0 auto;padding:0 28px}
.gold-text{background:linear-gradient(180deg,#fbecc0 0%,#e6c878 38%,#b8923f 64%,#f3e2ab 100%);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;color:transparent}

/* header */
header{position:fixed;top:0;left:0;right:0;z-index:50;display:flex;align-items:center;justify-content:space-between;padding:16px 34px;transition:background .4s,padding .4s,border-color .4s;border-bottom:1px solid transparent}
header.scrolled{background:rgba(10,6,5,.85);backdrop-filter:blur(14px);padding:12px 34px;border-bottom:1px solid var(--line)}
.brand{font-family:var(--display);font-size:1.4rem;letter-spacing:.32em;font-weight:700;padding-left:.32em}
.brand small{display:block;font-family:var(--serif);font-size:.5rem;letter-spacing:.5em;color:var(--muted);font-weight:500;margin-top:2px;padding-left:.5em}
.hnav{display:flex;gap:24px;align-items:center}
.hnav a{font-family:var(--serif);font-size:.85rem;letter-spacing:.08em;color:var(--gold-bright)}
.hnav a:hover{color:var(--gold)}

/* button */
.btn-cta{display:inline-block;font-family:var(--serif);font-weight:700;letter-spacing:.1em;font-size:.92rem;padding:14px 34px;border-radius:2px;color:#000;background:linear-gradient(180deg,#f6e3ab,#d8b768 55%,#b08a3c);border:1px solid #f0d99a;box-shadow:0 6px 22px rgba(176,138,60,.32);transition:transform .25s,box-shadow .25s,filter .25s}
.btn-cta:hover{transform:translateY(-2px);box-shadow:0 10px 30px rgba(176,138,60,.5);filter:brightness(1.06)}

/* article */
.article{padding:128px 0 96px}
.bg-texture{background:radial-gradient(circle at 12% 0%,rgba(74,42,82,.12),transparent 42%),radial-gradient(circle at 90% 100%,rgba(176,138,60,.06),transparent 45%),var(--bg)}
.crumbs{font-size:.76rem;color:var(--muted);margin-bottom:26px;letter-spacing:.04em}
.crumbs a{color:var(--gold-deep)}
.crumbs a:hover{color:var(--gold-bright)}
.crumbs span{color:var(--muted);margin:0 6px}
.eyebrow{font-family:var(--display);letter-spacing:.34em;font-size:.66rem;color:var(--gold);text-transform:uppercase;display:block;margin-bottom:16px}
.article h1{font-family:var(--serif);font-weight:800;font-size:clamp(1.75rem,4.6vw,2.7rem);line-height:1.5;letter-spacing:.03em;margin-bottom:20px}
.article h1 .gold-text{filter:drop-shadow(0 2px 12px rgba(176,138,60,.3))}
.lead{color:var(--muted);font-size:1.02rem;line-height:2.1}
.meta-row{display:flex;gap:16px;align-items:center;color:var(--gold-deep);font-size:.72rem;letter-spacing:.12em;font-family:var(--display);margin:26px 0 8px;border-bottom:1px solid var(--line);padding-bottom:24px}

.prose{margin-top:8px}
.toc{border:1px solid var(--line);border-radius:8px;padding:26px 30px;margin:10px 0 44px;background:linear-gradient(180deg,rgba(26,14,11,.5),rgba(10,6,5,.2))}
.toc .tt{font-family:var(--display);letter-spacing:.24em;font-size:.64rem;color:var(--gold);margin-bottom:16px}
.toc ol{margin:0;padding-left:1.4em;color:#d9cebb}
.toc li{margin-bottom:10px;line-height:1.6;font-family:var(--serif);letter-spacing:.03em}
.toc a{color:var(--ink);border-bottom:1px solid transparent;transition:color .3s,border-color .3s}
.toc a:hover{color:var(--gold-bright);border-color:var(--gold-deep)}
.prose h2{scroll-margin-top:90px;font-family:var(--serif);font-weight:700;font-size:1.38rem;letter-spacing:.05em;line-height:1.6;margin:50px 0 18px;padding-left:16px;border-left:3px solid var(--gold-deep)}
.prose h3{font-family:var(--serif);font-weight:700;font-size:1.12rem;margin:32px 0 12px;color:var(--gold-bright);letter-spacing:.04em}
.prose p{color:#d9cebb;font-size:.98rem;line-height:2.1;margin-bottom:20px}
.prose strong{color:var(--gold-bright);font-weight:700}
.prose ul,.prose ol{margin:0 0 20px 1.3em;color:#d9cebb}
.prose li{margin-bottom:9px;line-height:1.95}
.prose a{color:var(--gold-bright);border-bottom:1px solid var(--gold-deep);transition:color .3s}
.prose a:hover{color:var(--gold)}
.prose blockquote{margin:24px 0;padding:18px 24px;border-left:3px solid var(--crimson);background:rgba(108,18,18,.1);color:#e0d4c0;font-family:var(--serif);font-size:.96rem;line-height:1.95;border-radius:0 6px 6px 0}
.ptable-wrap{overflow-x:auto;margin:8px 0 24px;-webkit-overflow-scrolling:touch}
.ptable{width:100%;border-collapse:collapse;font-size:.9rem;min-width:520px}
.ptable th,.ptable td{border:1px solid var(--line);padding:13px 15px;text-align:left;vertical-align:top;line-height:1.75}
.ptable th{background:rgba(216,183,104,.09);color:var(--gold-bright);font-family:var(--serif);font-weight:700;letter-spacing:.04em;white-space:nowrap}
.ptable td{color:#d9cebb}
.ptable .ka{font-family:var(--serif);color:var(--gold-bright);font-weight:700;white-space:nowrap}
.ptable small{display:block;color:var(--muted);font-weight:500;font-size:.74rem;margin-top:2px}

/* interactive tools */
.tool{border:1px solid var(--gold-deep);border-radius:10px;padding:26px 28px;margin:34px 0;background:linear-gradient(180deg,rgba(108,18,18,.14),rgba(10,6,5,.4))}
.tool .tool-h{font-family:var(--serif);font-weight:700;font-size:1.16rem;letter-spacing:.04em;margin-bottom:6px;color:var(--ink)}
.tool .tool-sub{color:var(--muted);font-size:.84rem;margin-bottom:18px;line-height:1.7}
.tool .row{display:flex;gap:12px;flex-wrap:wrap;align-items:flex-end}
.tool .fld label{display:block;font-size:.72rem;color:var(--gold);letter-spacing:.06em;margin-bottom:6px}
.tool input,.tool select{background:#160c0a;border:1px solid var(--line);color:var(--ink);padding:11px 12px;border-radius:4px;font-family:inherit;font-size:1rem}
.tool input{width:92px}
.tool select{min-width:82px;cursor:pointer}
.tool input:focus,.tool select:focus{outline:none;border-color:var(--gold)}
.tool .btn-run{font-family:var(--serif);font-weight:700;letter-spacing:.08em;font-size:.95rem;padding:12px 28px;border-radius:2px;color:#000;background:linear-gradient(180deg,#f6e3ab,#d8b768 55%,#b08a3c);border:1px solid #f0d99a;cursor:pointer;transition:filter .25s,transform .25s}
.tool .btn-run:hover{filter:brightness(1.07);transform:translateY(-1px)}
.tool .result{margin-top:22px;border-top:1px solid var(--line);padding-top:20px;display:none}
.tool .result.show{display:block;animation:toolfade .5s ease}
@keyframes toolfade{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
.tool .res-line{font-family:var(--serif);font-size:1.02rem;margin-bottom:10px;letter-spacing:.04em;color:var(--ink)}
.tool .res-line b{color:var(--gold-bright);font-size:1.3rem;margin-left:6px}
.tool .res-note{color:var(--muted);font-size:.82rem;line-height:1.85;margin-top:10px}
.tool .res-note a{color:var(--gold-bright);border-bottom:1px solid var(--gold-deep)}
.tool .err{color:#e8a0a0;font-size:.88rem}
.tool table.mei{width:100%;border-collapse:collapse;margin:4px 0 6px}
.tool table.mei td{border:1px solid var(--line);padding:10px 6px;text-align:center;white-space:nowrap}
.tool table.mei .lbl{color:var(--gold);font-size:.72rem;background:rgba(216,183,104,.07)}
.tool table.mei .gz{font-family:var(--serif);font-size:1.4rem;color:var(--ink)}
.tool table.mei .day .gz,.tool table.mei td.day{color:var(--gold-bright)}
.tool .ban-wrap{display:flex;gap:20px;flex-wrap:wrap;justify-content:center;margin:12px 0 4px}
.tool .ban-block{flex:1 1 240px;max-width:300px}
.tool .ban-block .ban-h{text-align:center;font-family:var(--serif);color:var(--gold);font-size:.8rem;letter-spacing:.04em;margin-bottom:7px}
.tool table.ban{border-collapse:collapse;width:100%;table-layout:fixed}
.tool table.ban td{border:1px solid var(--line);height:62px;text-align:center;vertical-align:middle;padding:3px;background:rgba(10,6,5,.3)}
.tool table.ban .dir{display:block;font-size:.58rem;color:var(--muted);margin-bottom:2px}
.tool table.ban .st{font-family:var(--serif);font-size:.92rem;color:var(--ink)}
.tool table.ban td.c{background:radial-gradient(circle,rgba(216,183,104,.25),rgba(108,18,18,.18));border-color:var(--gold)}
.tool table.ban td.c .st{color:var(--gold-bright);font-weight:700}
.tool table.ban td.cn{color:var(--gold)}
.tool table.mei td.duo{cursor:pointer;transition:background .2s}
.tool table.mei td.duo:hover{background:rgba(216,183,104,.14)}
.cta-box{margin:52px 0 0;border:1px solid var(--gold-deep);border-radius:8px;padding:32px 34px;background:linear-gradient(180deg,rgba(108,18,18,.16),rgba(10,6,5,.25));text-align:center}
.cta-box .eyebrow{margin-bottom:10px}
.cta-box h3{font-family:var(--serif);font-weight:700;font-size:1.25rem;letter-spacing:.05em;margin-bottom:12px;border:0;padding:0;color:var(--ink)}
.cta-box p{color:var(--muted);font-size:.9rem;margin-bottom:22px;line-height:1.9}

/* related */
.related{margin-top:64px;border-top:1px solid var(--line);padding-top:36px}
.related .rt{font-family:var(--display);letter-spacing:.28em;font-size:.66rem;color:var(--gold);margin-bottom:22px}
.related a{display:block;padding:16px 0;border-bottom:1px solid var(--line);font-family:var(--serif);font-size:1rem;letter-spacing:.04em;color:var(--ink);transition:color .3s;display:flex;justify-content:space-between;gap:14px;align-items:center}
.related a::after{content:"→";color:var(--gold-deep);flex-shrink:0}
.related a:hover{color:var(--gold-bright)}

/* column index */
.col-head{text-align:center;margin-bottom:54px}
.col-head .eyebrow{margin-bottom:14px}
.col-head h1{font-family:var(--serif);font-weight:800;font-size:clamp(1.9rem,5vw,2.8rem);letter-spacing:.08em}
.col-head p{color:var(--muted);margin-top:18px;font-size:.96rem}
.col-list{display:flex;flex-direction:column;gap:20px}
.col-card{display:block;border:1px solid var(--line);border-radius:8px;padding:30px 32px;background:linear-gradient(180deg,rgba(26,14,11,.6),rgba(10,6,5,.25));transition:transform .4s,border-color .4s,box-shadow .4s}
.col-card:hover{transform:translateY(-4px);border-color:var(--gold-deep);box-shadow:0 16px 40px rgba(0,0,0,.5)}
.col-card .tag{display:inline-block;font-family:var(--display);font-size:.6rem;letter-spacing:.2em;color:var(--gold);border:1px solid var(--gold-deep);border-radius:999px;padding:4px 12px;margin-bottom:14px}
.col-card h2{font-family:var(--serif);font-weight:700;font-size:1.3rem;letter-spacing:.04em;line-height:1.5;margin-bottom:10px}
.col-card p{color:var(--muted);font-size:.9rem;line-height:1.9}

/* footer */
footer{background:#070403;border-top:1px solid var(--line);padding:50px 0 36px}
.foot-row{max-width:860px;margin:0 auto;padding:0 28px;display:flex;justify-content:space-between;align-items:center;gap:24px;flex-wrap:wrap}
.foot-row .brand{font-size:1.4rem}
.foot-row .links{display:flex;gap:24px;flex-wrap:wrap}
.foot-row .links a{font-family:var(--serif);font-size:.85rem;color:var(--muted);transition:color .3s}
.foot-row .links a:hover{color:var(--gold-bright)}
.foot-bottom{max-width:860px;margin:28px auto 0;padding:22px 28px 0;border-top:1px solid var(--line);color:#6a5c48;font-size:.74rem;letter-spacing:.06em}
.foot-bottom .disclaimer{color:#5a4d3c;font-size:.7rem;line-height:1.8;margin-top:12px}

@media(max-width:680px){
  header{padding:14px 20px}
  .brand{font-size:1.2rem}
  .hnav{gap:16px}
  .hnav a{font-size:.78rem}
}