/* ============================================================
   SECOND SKIN — premium beauty-editorial design system
   ============================================================ */
:root{
  --bg:#FBF7F2;            /* warm ivory */
  --bg-2:#F4ECE1;          /* deeper cream panel */
  --paper:#FFFFFF;
  --ink:#2A2622;           /* warm near-black */
  --ink-soft:#6F665B;
  --ink-faint:#A99E90;
  --line:#E8DECF;
  --line-2:#DBCDB8;
  --clay:#BD7A62;          /* dusty terracotta-rose */
  --clay-deep:#8A4F3C;
  --rose:#D69A86;
  --gold:#C2A06A;
  --glow-1:#FBE3D2;
  --glow-2:#F3D0CE;
  --glow-3:#E9D8C2;
  --ok:#5E8C6A;
  --warn:#B06A4F;
  --serif:"Fraunces","Georgia",serif;
  --sans:"Inter",system-ui,-apple-system,"Segoe UI",sans-serif;
  --mono:"Spline Sans Mono",ui-monospace,"SFMono-Regular","Menlo",monospace;
  --maxw:760px;
  --shadow:0 1px 2px rgba(60,40,30,.04),0 12px 40px -18px rgba(80,50,35,.22);
  --shadow-sm:0 1px 3px rgba(60,40,30,.06);
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;background:var(--bg);color:var(--ink);
  font-family:var(--sans);font-size:18px;line-height:1.7;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
}
img{max-width:100%}
a{color:var(--clay-deep)}

/* reading progress */
#progress{position:fixed;top:0;left:0;height:3px;width:0;z-index:60;
  background:linear-gradient(90deg,var(--clay),var(--gold));transition:width .1s ease}

/* layout shell */
.wrap{display:grid;grid-template-columns:260px minmax(0,1fr);gap:0;max-width:1180px;margin:0 auto}
@media(max-width:900px){.wrap{grid-template-columns:1fr}}

/* side nav */
.nav{position:sticky;top:0;align-self:start;height:100vh;padding:38px 26px;
  border-right:1px solid var(--line);overflow-y:auto}
.nav .brandmark{font-family:var(--serif);font-weight:600;font-size:20px;letter-spacing:.16em;
  text-transform:uppercase;line-height:1.1;margin-bottom:4px}
.nav .brandmark span{display:block;font-size:10px;letter-spacing:.34em;color:var(--clay);margin-top:6px}
.nav ol{list-style:none;margin:28px 0 0;padding:0;counter-reset:n}
.nav li{margin:0 0 2px}
.nav a{display:flex;gap:10px;align-items:baseline;padding:7px 10px;border-radius:8px;
  text-decoration:none;color:var(--ink-soft);font-size:13.5px;line-height:1.35;transition:.15s}
.nav a .nn{font-family:var(--mono);font-size:11px;color:var(--ink-faint);min-width:22px}
.nav a:hover{background:var(--bg-2);color:var(--ink)}
.nav a.active{background:#fff;color:var(--clay-deep);box-shadow:var(--shadow-sm);font-weight:500}
.nav a.active .nn{color:var(--clay)}
.nav .navfoot{margin-top:26px;padding-top:18px;border-top:1px solid var(--line);
  font-size:11px;color:var(--ink-faint);line-height:1.6}
@media(max-width:900px){.nav{display:none}}

/* main column */
.main{padding:0 0 120px}
.col{max-width:var(--maxw);margin:0 auto;padding:0 28px}

/* ---------- COVER ---------- */
.cover{position:relative;overflow:hidden;padding:96px 0 70px;margin-bottom:30px;
  border-bottom:1px solid var(--line)}
.cover .glow{position:absolute;inset:-30% -10% auto -10%;height:560px;z-index:0;filter:blur(8px);
  background:
    radial-gradient(60% 80% at 78% 18%,var(--glow-2),transparent 60%),
    radial-gradient(55% 70% at 20% 30%,var(--glow-1),transparent 62%),
    radial-gradient(70% 90% at 60% 80%,var(--glow-3),transparent 60%);
  opacity:.9}
.cover .col{position:relative;z-index:1}
.brandbar{display:flex;align-items:center;gap:13px;margin-bottom:28px}
.brlogo{width:38px;height:38px;border-radius:50%;border:1px solid var(--line);object-fit:cover;flex:none;background:#fff}
.brandbar .brmark{font-family:var(--serif);font-weight:600;font-size:15px;letter-spacing:.2em;
  text-transform:uppercase;color:var(--ink)}
.brandbar .brtag{font-family:var(--serif);font-style:italic;font-size:13px;color:var(--clay);letter-spacing:.01em}
.eyebrow{font-size:12px;letter-spacing:.32em;text-transform:uppercase;color:var(--clay);
  font-weight:600;margin-bottom:22px}
.cover h1{font-family:var(--serif);font-weight:600;font-size:clamp(40px,7vw,72px);line-height:1.02;
  letter-spacing:-.01em;margin:0 0 8px}
.cover h1 .ss{display:block;font-size:.5em;letter-spacing:.02em;color:var(--clay-deep);
  font-style:italic;font-weight:400;margin-top:14px}
.cover .sub{font-size:20px;line-height:1.55;color:var(--ink-soft);max-width:560px;margin:24px 0 0}
.cover .meta-row{display:flex;flex-wrap:wrap;gap:10px 22px;margin-top:32px;align-items:center;
  font-size:13px;color:var(--ink-faint);letter-spacing:.04em}
.pill{display:inline-block;background:#fff;border:1px solid var(--line-2);border-radius:999px;
  padding:6px 14px;font-size:12.5px;color:var(--clay-deep);font-weight:500;letter-spacing:.02em}
.promise{margin:40px 0 0;padding:26px 28px;background:#fff;border:1px solid var(--line);
  border-radius:16px;box-shadow:var(--shadow);font-size:17px;line-height:1.6}
.promise b{font-family:var(--serif);font-weight:600;color:var(--clay-deep)}
.whatsin{margin-top:26px;display:flex;flex-wrap:wrap;gap:8px}
.whatsin .chip{font-size:12.5px;padding:6px 12px;border-radius:8px;background:var(--bg-2);
  border:1px solid var(--line);color:var(--ink-soft)}

/* ---------- MODULE ---------- */
.module{padding:64px 0 0;scroll-margin-top:20px}
.module .head{margin-bottom:30px}
.modnum{font-family:var(--mono);font-size:13px;color:var(--clay);letter-spacing:.2em}
.kicker{font-size:11.5px;letter-spacing:.28em;text-transform:uppercase;color:var(--ink-faint);
  font-weight:600;margin:18px 0 10px}
.module h2{font-family:var(--serif);font-weight:600;font-size:clamp(30px,4.6vw,44px);line-height:1.05;
  letter-spacing:-.01em;margin:0}
.lede{font-size:20px;line-height:1.55;color:var(--ink-soft);margin:18px 0 0;
  font-family:var(--serif);font-weight:400;font-style:italic}
.module h3{font-family:var(--sans);font-weight:650;font-size:15px;letter-spacing:.04em;
  text-transform:uppercase;color:var(--clay-deep);margin:42px 0 4px}
.module p{margin:16px 0}
.src{color:var(--clay);font-size:.82em;font-style:normal;white-space:nowrap}

/* lists */
.module ul,.module ol{margin:14px 0;padding-left:0;list-style:none}
.module ul li,.module ol li{position:relative;padding-left:30px;margin:11px 0;line-height:1.6}
.module ul li::before{content:"";position:absolute;left:6px;top:12px;width:6px;height:6px;
  border-radius:50%;background:var(--clay)}
.module ol{counter-reset:li}
.module ol li{counter-increment:li}
.module ol li::before{content:counter(li);position:absolute;left:0;top:1px;width:22px;height:22px;
  border-radius:50%;background:var(--bg-2);border:1px solid var(--line-2);color:var(--clay-deep);
  font-size:12px;font-weight:700;display:flex;align-items:center;justify-content:center;
  font-family:var(--mono)}

/* keyword chips */
.kw{display:flex;flex-wrap:wrap;gap:8px;margin:18px 0}
.kw span{font-size:13.5px;padding:7px 13px;border-radius:8px;background:#fff;border:1px solid var(--line-2);
  color:var(--ink);font-family:var(--mono);letter-spacing:-.01em}

/* callouts */
.callout{margin:26px 0;padding:20px 22px 20px 24px;border-radius:14px;border:1px solid var(--line);
  background:#fff;box-shadow:var(--shadow-sm);position:relative}
.callout::before{content:"";position:absolute;left:0;top:14px;bottom:14px;width:4px;border-radius:4px;background:var(--clay)}
.callout .ct{font-size:12px;letter-spacing:.14em;text-transform:uppercase;font-weight:700;
  margin-bottom:8px;display:flex;align-items:center;gap:8px}
.callout .ic{font-size:15px}
.callout.tip::before{background:var(--gold)} .callout.tip .ct{color:var(--clay-deep)}
.callout.note::before{background:var(--ink-faint)} .callout.note .ct{color:var(--ink-soft)}
.callout.warn{background:#fdf4ef} .callout.warn::before{background:var(--warn)} .callout.warn .ct{color:var(--warn)}
.callout.ethics{background:#f3f6f2} .callout.ethics::before{background:var(--ok)} .callout.ethics .ct{color:var(--ok)}
.callout p{margin:0}

/* prompt cards */
.prompt{margin:22px 0;border:1px solid var(--line-2);border-radius:14px;background:#fff;
  overflow:hidden;box-shadow:var(--shadow-sm);transition:.18s}
.prompt:hover{box-shadow:var(--shadow);transform:translateY(-1px)}
.prompt .ph{display:flex;align-items:flex-start;justify-content:space-between;gap:14px;
  padding:15px 16px 11px;border-bottom:1px dashed var(--line-2)}
.prompt .pt{font-weight:650;font-size:15px;letter-spacing:.01em}
.prompt .tags{display:flex;flex-wrap:wrap;gap:6px;margin-top:7px}
.prompt .tags i{font-style:normal;font-size:10.5px;letter-spacing:.08em;text-transform:uppercase;
  color:var(--clay);background:var(--glow-1);border-radius:5px;padding:3px 7px;font-weight:600}
.copy{flex:none;cursor:pointer;border:1px solid var(--line-2);background:var(--bg);border-radius:8px;
  font-family:var(--mono);font-size:11.5px;letter-spacing:.06em;color:var(--clay-deep);
  padding:7px 12px;transition:.15s;white-space:nowrap}
.copy:hover{background:var(--clay);color:#fff;border-color:var(--clay)}
.copy.done{background:var(--ok);color:#fff;border-color:var(--ok)}
.prompt .pbody{font-family:var(--mono);font-size:13.5px;line-height:1.62;color:#3a342d;
  padding:15px 16px;white-space:pre-wrap;word-break:break-word;background:
   linear-gradient(180deg,#fffdfa,#fff)}
.prompt .pnote{font-size:13.5px;color:var(--ink-soft);font-style:italic;padding:0 16px 15px;line-height:1.5}
.prompt .pnote::before{content:"↳ ";color:var(--clay);font-style:normal}

/* table */
.tablewrap{margin:22px 0;border:1px solid var(--line-2);border-radius:14px;overflow:hidden;box-shadow:var(--shadow-sm)}
table{width:100%;border-collapse:collapse;font-size:14.5px;background:#fff}
thead th{background:var(--bg-2);text-align:left;font-weight:650;font-size:12px;letter-spacing:.08em;
  text-transform:uppercase;color:var(--clay-deep);padding:12px 14px}
tbody td{padding:12px 14px;border-top:1px solid var(--line);vertical-align:top;line-height:1.45}
tbody tr td:first-child{font-weight:600;color:var(--ink)}
tbody tr:nth-child(even){background:#fdfbf8}

/* pull quote */
.pquote{margin:34px 0;padding:6px 0 6px 26px;border-left:3px solid var(--clay);
  font-family:var(--serif);font-style:italic;font-size:25px;line-height:1.3;color:var(--clay-deep)}
.pquote cite{display:block;font-family:var(--sans);font-style:normal;font-size:13px;
  letter-spacing:.08em;text-transform:uppercase;color:var(--ink-faint);margin-top:12px}

/* stats */
.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:26px 0}
@media(max-width:560px){.stats{grid-template-columns:1fr}}
.stat{background:#fff;border:1px solid var(--line);border-radius:14px;padding:20px 18px;box-shadow:var(--shadow-sm)}
.stat .v{font-family:var(--serif);font-weight:600;font-size:34px;line-height:1;color:var(--clay-deep)}
.stat .l{font-size:13px;color:var(--ink-soft);margin-top:9px;line-height:1.4}

/* steps */
.steps{margin:22px 0;counter-reset:st}
.step{display:flex;gap:16px;padding:16px 0;border-top:1px solid var(--line)}
.step:first-child{border-top:0}
.step .sn{counter-increment:st;flex:none;width:34px;height:34px;border-radius:50%;
  background:linear-gradient(135deg,var(--clay),var(--rose));color:#fff;font-family:var(--mono);
  font-weight:700;font-size:14px;display:flex;align-items:center;justify-content:center}
.step .sn::before{content:counter(st)}
.step .sh{font-weight:650;font-size:15.5px;margin-bottom:3px}
.step .sb{color:var(--ink-soft);font-size:15px;line-height:1.55}

/* before/after slider */
.ba{margin:24px 0}
.bawrap{position:relative;border-radius:16px;overflow:hidden;border:1px solid var(--line-2);
  aspect-ratio:5/4;max-width:520px;box-shadow:var(--shadow);user-select:none}
.balayer{position:absolute;inset:0;display:flex;align-items:flex-end;padding:18px}
.balayer.after{background:
  radial-gradient(120% 90% at 70% 20%,#f6ddc8,#e7b89c 55%,#d99e7e);}
.balayer.before{background:
  radial-gradient(120% 90% at 70% 20%,#d8c2ad,#b49b86 55%,#9c8068);
  clip-path:inset(0 50% 0 0)}
.balabel{font-family:var(--mono);font-size:12px;letter-spacing:.04em;color:#fff;
  background:rgba(40,30,25,.42);backdrop-filter:blur(3px);padding:7px 11px;border-radius:8px;line-height:1.3;max-width:60%}
.balayer.after .balabel{margin-left:auto}
.bahandle{position:absolute;top:0;bottom:0;left:50%;width:2px;background:#fff;box-shadow:0 0 0 1px rgba(0,0,0,.06);pointer-events:none}
.bahandle::after{content:"⇆";position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);
  width:38px;height:38px;border-radius:50%;background:#fff;color:var(--clay-deep);
  display:flex;align-items:center;justify-content:center;font-size:15px;box-shadow:var(--shadow)}
.barange{position:absolute;inset:0;width:100%;margin:0;opacity:0;cursor:ew-resize}
.bacap{font-size:13px;color:var(--ink-faint);font-style:italic;margin-top:10px;max-width:520px}

/* divider */
.hr{height:1px;background:var(--line);margin:40px 0;border:0}

/* ---------- VAULT ---------- */
.vault{margin-top:80px;padding-top:30px;border-top:2px solid var(--line-2)}
.vault .vintro{font-size:18px;color:var(--ink-soft);margin:10px 0 6px}
.vcat{margin-top:40px}
.vcat h3{font-family:var(--serif);font-weight:600;font-size:24px;text-transform:none;letter-spacing:0;
  color:var(--ink);margin:0 0 4px}
.vgrid{display:block}

/* ---------- APPENDIX ---------- */
.appendix{margin-top:80px;padding-top:30px;border-top:2px solid var(--line-2)}
.appendix h3{font-family:var(--serif);font-weight:600;font-size:22px;text-transform:none;letter-spacing:0;color:var(--ink);margin:36px 0 8px}
.check li::before{content:"✓"!important;background:none!important;color:var(--ok)!important;
  font-weight:800;top:2px!important;left:2px!important;width:auto!important;height:auto!important}
dl.gloss{margin:8px 0}
dl.gloss dt{font-weight:650;margin-top:14px;color:var(--clay-deep)}
dl.gloss dd{margin:2px 0 0;color:var(--ink-soft);font-size:15.5px;line-height:1.5}

/* footer */
.foot{max-width:var(--maxw);margin:90px auto 0;padding:30px 28px 0;border-top:1px solid var(--line);
  color:var(--ink-faint);font-size:13px;line-height:1.7}
.foot .fb{font-family:var(--serif);letter-spacing:.16em;text-transform:uppercase;color:var(--clay);font-size:14px}

/* toast */
#toast{position:fixed;left:50%;bottom:28px;transform:translateX(-50%) translateY(20px);
  background:var(--ink);color:#fff;padding:11px 20px;border-radius:10px;font-size:14px;
  opacity:0;pointer-events:none;transition:.25s;z-index:80}
#toast.show{opacity:1;transform:translateX(-50%) translateY(0)}

/* ---------- prompt builder ---------- */
.builder{margin:24px 0;border:1px solid var(--line-2);border-radius:16px;background:linear-gradient(180deg,#fff,#fdfaf6);box-shadow:var(--shadow);overflow:hidden}
.bgrid{display:grid;grid-template-columns:1fr 1fr}
@media(max-width:620px){.bgrid{grid-template-columns:1fr}}
.bslot{padding:12px 15px;border-bottom:1px solid var(--line);border-right:1px solid var(--line)}
.bslot label{display:block;font-size:10px;letter-spacing:.16em;text-transform:uppercase;color:var(--clay);font-weight:700;margin-bottom:6px}
.bslot select{width:100%;border:1px solid var(--line-2);border-radius:8px;background:#fff;padding:9px 10px;font-family:var(--sans);font-size:13.5px;color:var(--ink);cursor:pointer}
.bout{padding:15px 16px;background:var(--bg-2);border-top:1px solid var(--line-2)}
.blab{display:flex;justify-content:space-between;align-items:center;margin-bottom:9px}
.blab span{font-size:10.5px;letter-spacing:.16em;text-transform:uppercase;color:var(--ink-faint);font-weight:700}
.btext{font-family:var(--mono);font-size:13px;line-height:1.62;color:#3a342d;white-space:pre-wrap;word-break:break-word}

/* ---------- generated-image figures + gallery + lightbox ---------- */
figure.shot{margin:24px 0}
figure.shot img{width:100%;border-radius:16px;border:1px solid var(--line-2);box-shadow:var(--shadow);display:block;cursor:zoom-in}
figure.shot figcaption{font-size:13px;color:var(--ink-faint);font-style:italic;margin-top:10px}
figure.shot figcaption .gtag{font-style:normal;font-size:10.5px;letter-spacing:.08em;text-transform:uppercase;color:var(--clay);background:var(--glow-1);border-radius:5px;padding:3px 7px;font-weight:600;margin-right:8px}
.gallery{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;margin:24px 0}
@media(max-width:600px){.gallery{grid-template-columns:1fr}}
.gallery figure{margin:0}
.lightbox{position:fixed;inset:0;background:rgba(20,14,11,.88);backdrop-filter:blur(6px);display:none;align-items:center;justify-content:center;z-index:90;padding:28px;cursor:zoom-out}
.lightbox.open{display:flex}
.lightbox img{max-width:92vw;max-height:90vh;border-radius:12px;box-shadow:0 30px 90px rgba(0,0,0,.55)}

/* ---------- video ---------- */
figure.vid{margin:26px 0}
.vbadge{display:inline-block;font-size:10px;letter-spacing:.12em;text-transform:uppercase;color:#fff;background:var(--clay);border-radius:6px;padding:4px 10px;font-weight:700;margin-bottom:9px}
figure.vid video{width:100%;border-radius:16px;border:1px solid var(--line-2);box-shadow:var(--shadow);display:block;background:#000}
figure.vid figcaption{font-size:13px;color:var(--ink-faint);font-style:italic;margin-top:10px}

/* ---------- before/after with real images ---------- */
.balayer.imgbg{background-size:cover;background-position:center top}

/* ---------- scroll reveal ---------- */
.reveal{opacity:0;transform:translateY(18px);transition:opacity .6s ease,transform .6s cubic-bezier(.2,.7,.2,1)}
.reveal.in{opacity:1;transform:none}
@media print{.reveal{opacity:1!important;transform:none!important}}

/* ============================================================
   PRINT / PDF
   ============================================================ */
@page{size:A4;margin:18mm 16mm;
  @bottom-center{content:"SECOND SKIN · Billy Richards · billyrichards.com";
    font-family:"Inter",sans-serif;font-size:8pt;color:#A99E90}
  @bottom-right{content:counter(page);font-family:"Spline Sans Mono",monospace;font-size:8pt;color:#A99E90}}
@media print{
  body{background:#fff;font-size:10.5pt;line-height:1.5}
  .dlpdf{display:none!important}
  #progress,.nav,#toast,.copy,.barange,.bahandle{display:none!important}
  .wrap{display:block;max-width:none}
  .main{padding:0}
  .col{max-width:none;padding:0}
  .cover{min-height:auto;padding:10mm 0 8mm;page-break-after:always;border:0}
  .cover .glow{opacity:.5}
  .module{page-break-before:always;padding-top:4mm}
  .vault,.appendix{page-break-before:always}
  .prompt,.callout,.tablewrap,.ba,.step,.stat{page-break-inside:avoid}
  .prompt:hover{transform:none;box-shadow:var(--shadow-sm)}
  .cover h1{font-size:34pt}
  .module h2{font-size:22pt}
  .lede{font-size:13pt}
  a{color:var(--ink);text-decoration:none}
  .balayer.before{clip-path:inset(0 50% 0 0)} /* show both halves */
  .stats{grid-template-columns:repeat(3,1fr)}
}