/* ============================================================
   Deep Skills - Marketing Site
   Fresh design system. One stylesheet, all nine pages.
   Dark brand family. Amber is the site-wide accent; each skill
   page re-themes the accent tokens via a body.theme-* class
   (palette mirrors docs/Training). Zero dependencies beyond
   Google Fonts via <link>.
   ============================================================ */

/* ---------- design tokens ---------- */
:root{
  /* dark background scale */
  --bg:#07080c;
  --bg-raise:#0c0e14;
  --panel:#11131b;
  --panel-2:#161923;
  --panel-3:#1b1f2b;
  --line:#22252f;
  --line-2:#2d3140;

  /* text scale */
  --text:#edeef4;
  --muted:#99a0af;
  --faint:#6d7383;

  /* the ONE primary accent */
  --accent:#ffb24d;
  --accent-deep:#f5972a;
  --accent-bright:#ffd49b;
  --accent-soft:rgba(255,178,77,.10);
  --accent-line:rgba(255,178,77,.32);
  --accent-glow:rgba(255,178,77,.26);

  /* semantic (sparing use) */
  --good:#5fd0a0;

  /* shape + rhythm */
  --radius:16px;
  --radius-sm:10px;
  --maxw:1120px;
  --nav-h:64px;

  /* type */
  --display:'Space Grotesk',system-ui,sans-serif;
  --body:'Inter',system-ui,-apple-system,'Segoe UI',sans-serif;
  --mono:'JetBrains Mono','SF Mono',ui-monospace,Menlo,monospace;
}

/* ---------- per-skill accent themes (mirrors docs/Training palette) ---------- */
.theme-plan       {--accent:#6ea8ff;--accent-deep:#4f86e0;--accent-bright:#b3d2ff;--accent-soft:rgba(110,168,255,.12);--accent-line:rgba(110,168,255,.34);--accent-glow:rgba(110,168,255,.28)}
.theme-plan-review{--accent:#a98bff;--accent-deep:#8a68f0;--accent-bright:#cfbdff;--accent-soft:rgba(169,139,255,.13);--accent-line:rgba(169,139,255,.34);--accent-glow:rgba(169,139,255,.28)}
.theme-implement  {--accent:#5fd0a0;--accent-deep:#3eb583;--accent-bright:#9fe9c8;--accent-soft:rgba(95,208,160,.13);--accent-line:rgba(95,208,160,.34);--accent-glow:rgba(95,208,160,.26)}
.theme-code-review{--accent:#ffb24d;--accent-deep:#f5972a;--accent-bright:#ffd49b;--accent-soft:rgba(255,178,77,.12);--accent-line:rgba(255,178,77,.34);--accent-glow:rgba(255,178,77,.30)}
.theme-bugfix     {--accent:#ff6b6b;--accent-deep:#ec4f4f;--accent-bright:#ffa8a8;--accent-soft:rgba(255,107,107,.12);--accent-line:rgba(255,107,107,.34);--accent-glow:rgba(255,107,107,.28)}
.theme-docs       {--accent:#46d5d0;--accent-deep:#27b3ae;--accent-bright:#8ceae6;--accent-soft:rgba(70,213,208,.12);--accent-line:rgba(70,213,208,.34);--accent-glow:rgba(70,213,208,.26)}

/* ---------- base ---------- */
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:var(--body);
  background:var(--bg);
  color:var(--text);
  line-height:1.65;
  font-size:16px;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
h1,h2,h3,h4{font-family:var(--display);letter-spacing:-.02em;line-height:1.12;font-weight:700}
p{margin:0}
a{color:var(--accent);text-decoration:none;transition:color .18s ease}
a:hover{color:var(--text)}
img,svg{max-width:100%;height:auto;display:block}
ul,ol{list-style:none}
strong,b{color:#fff;font-weight:600}
code{
  font-family:var(--mono);font-size:.88em;color:#e3e7f2;
  background:var(--panel-3);border:1px solid var(--line);
  padding:.12em .42em;border-radius:6px;white-space:nowrap;
}
pre{
  font-family:var(--mono);font-size:13.5px;line-height:1.7;color:#e3e7f2;
  background:var(--panel);border:1px solid var(--line);border-radius:var(--radius-sm);
  padding:18px 20px;overflow-x:auto;
}
pre code{background:none;border:none;padding:0;white-space:pre}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:4px}

.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}
.narrow{max-width:800px}
.muted{color:var(--muted)}
.faint{color:var(--faint)}
.accent{color:var(--accent)}
.center{text-align:center}

/* ---------- skip link ---------- */
.skip-link{
  position:absolute;left:-9999px;top:0;z-index:200;
  background:var(--accent);color:#0a0a0a;font-weight:600;
  padding:10px 18px;border-radius:0 0 var(--radius-sm) 0;
}
.skip-link:focus{left:0;color:#0a0a0a}

/* ---------- scroll progress ---------- */
#progress{
  position:fixed;top:0;left:0;height:3px;width:0;z-index:140;
  background:linear-gradient(90deg,var(--accent),var(--accent-deep));
  box-shadow:0 0 12px var(--accent-glow);
}

/* ---------- ambient glow ---------- */
.glow{position:fixed;border-radius:50%;filter:blur(130px);opacity:.4;z-index:0;pointer-events:none}
.glow.a{width:560px;height:560px;background:radial-gradient(circle,var(--accent-glow),transparent 70%);top:-220px;right:-160px}
.glow.b{width:620px;height:620px;background:radial-gradient(circle,rgba(255,178,77,.08),transparent 70%);bottom:-260px;left:-260px}
main,section,footer{position:relative;z-index:1}

/* ---------- nav ---------- */
.site-nav{
  position:sticky;top:0;z-index:120;
  background:rgba(7,8,12,.78);
  -webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line);
}
.nav-row{display:flex;align-items:center;justify-content:space-between;height:var(--nav-h);gap:16px}
.brand{
  display:flex;align-items:center;gap:10px;
  font-family:var(--display);font-weight:600;font-size:16px;color:var(--text);white-space:nowrap;
}
.brand:hover{color:var(--text)}
.brand-dot{
  width:11px;height:11px;border-radius:50%;flex:none;
  background:linear-gradient(135deg,var(--accent),var(--accent-deep));
  box-shadow:0 0 16px var(--accent-glow);
}
.nav-menu > ul{display:flex;align-items:center;gap:26px;font-size:14px}
.nav-menu a{color:var(--muted);font-weight:500}
.nav-menu a:hover{color:var(--text)}
.nav-menu a[aria-current="page"]{color:var(--accent)}
.nav-menu .btn{font-size:13.5px;padding:9px 18px}
.nav-menu a.btn[aria-current="page"]{color:#0a0a0a}

/* skills dropdown */
.nav-dropdown{position:relative}
.nav-dropbtn{
  display:inline-flex;align-items:center;gap:7px;
  background:none;border:none;cursor:pointer;
  font:inherit;font-weight:500;font-size:14px;color:var(--muted);
  padding:4px 0;transition:color .18s ease;
}
.nav-dropbtn:hover{color:var(--text)}
.nav-dropbtn::after{
  content:"";width:7px;height:7px;flex:none;margin-top:-3px;
  border-right:1.6px solid currentColor;border-bottom:1.6px solid currentColor;
  transform:rotate(45deg);transition:transform .18s ease;
}
.nav-dropbtn[aria-expanded="true"]::after{transform:rotate(-135deg);margin-top:3px}
.nav-dropbtn.here{color:var(--accent)}
.dropdown{
  position:absolute;top:calc(100% + 12px);left:50%;transform:translateX(-50%);
  min-width:210px;padding:8px;
  background:var(--panel);border:1px solid var(--line-2);border-radius:var(--radius-sm);
  box-shadow:0 18px 44px rgba(0,0,0,.55);
  display:none;flex-direction:column;gap:0;
}
.nav-dropdown.open .dropdown{display:flex}
.dropdown a{
  display:block;padding:9px 14px;border-radius:7px;
  color:var(--muted);font-family:var(--mono);font-size:13px;
}
.dropdown a:hover{color:var(--text);background:var(--panel-3)}
.dropdown a[aria-current="page"]{color:var(--accent);background:var(--accent-soft)}
/* no-JS fallback: open dropdown on hover/focus-within */
html:not(.js) .nav-dropdown:hover .dropdown,
html:not(.js) .nav-dropdown:focus-within .dropdown{display:flex}

/* mobile toggle (hamburger) */
.nav-toggle{
  display:none;flex-direction:column;justify-content:center;gap:5px;
  width:42px;height:38px;padding:0 10px;cursor:pointer;
  background:none;border:1px solid var(--line);border-radius:9px;
}
.nav-toggle span{display:block;height:2px;width:100%;background:var(--text);border-radius:2px;transition:transform .2s ease,opacity .2s ease}
.nav-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

@media(max-width:880px){
  .nav-toggle{display:flex}
  .nav-menu{
    position:absolute;top:var(--nav-h);left:0;right:0;
    background:rgba(9,11,16,.98);border-bottom:1px solid var(--line);
  }
  html.js .nav-menu{display:none}
  html.js .nav-menu.open{display:block}
  .nav-menu > ul{flex-direction:column;align-items:stretch;gap:0;padding:8px 0}
  .nav-menu > ul > li > a,.nav-dropbtn{display:block;width:100%;text-align:left;padding:13px 24px;border-top:1px solid var(--line)}
  .nav-menu > ul > li:first-child > a{border-top:none}
  .nav-dropbtn{display:flex;justify-content:space-between}
  .dropdown{
    position:static;transform:none;min-width:0;display:none;
    border:none;border-radius:0;box-shadow:none;background:var(--bg-raise);padding:0 0 6px;
  }
  .dropdown a{padding:11px 38px;border-radius:0}
  .nav-menu .btn{margin:12px 24px;display:block;text-align:center}
}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:9px;
  font-family:var(--display);font-weight:600;font-size:15px;line-height:1;
  padding:14px 26px;border-radius:11px;cursor:pointer;
  border:1px solid transparent;transition:transform .16s ease,box-shadow .16s ease,background .16s ease,color .16s ease,border-color .16s ease;
  white-space:nowrap;
}
.btn-primary{
  background:linear-gradient(135deg,var(--accent),var(--accent-deep));
  color:#0a0a0a;box-shadow:0 6px 24px var(--accent-glow);
}
.btn-primary:hover{color:#0a0a0a;transform:translateY(-2px);box-shadow:0 10px 30px var(--accent-glow)}
.btn-ghost{
  background:transparent;color:var(--text);border-color:var(--line-2);
}
.btn-ghost:hover{color:var(--text);border-color:var(--accent-line);background:var(--accent-soft)}
.btn-row{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}

/* ---------- hero ---------- */
.hero{padding:96px 0 72px;text-align:center}
.eyebrow{
  display:inline-flex;align-items:center;gap:9px;
  font-size:12px;font-weight:600;letter-spacing:.16em;text-transform:uppercase;
  color:var(--accent);background:var(--accent-soft);
  border:1px solid var(--accent-line);border-radius:100px;
  padding:7px 16px;margin-bottom:28px;
}
.hero h1{font-size:clamp(38px,6.2vw,74px);margin-bottom:8px}
.hero h1 .grad{
  background:linear-gradient(100deg,var(--accent),var(--accent-bright) 55%,var(--accent-deep));
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.hero .sub{
  font-size:clamp(16px,2.2vw,20px);color:var(--muted);
  max-width:640px;margin:22px auto 0;
}
.hero .sub b{color:var(--text)}
.hero .btn-row{margin-top:36px}

/* ---------- sections ---------- */
section{padding:72px 0}
.section-head{max-width:680px;margin:0 auto 48px;text-align:center}
.section-head .kicker{
  font-family:var(--mono);font-size:12.5px;letter-spacing:.14em;text-transform:uppercase;
  color:var(--accent);margin-bottom:14px;
}
.section-head h2{font-size:clamp(27px,3.8vw,40px);margin-bottom:14px}
.section-head p{color:var(--muted);font-size:16.5px}
.band{background:var(--bg-raise);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}

/* ---------- feature / skill grid ---------- */
.grid{display:grid;gap:20px}
.grid.cols-2{grid-template-columns:repeat(2,1fr)}
.grid.cols-3{grid-template-columns:repeat(3,1fr)}
@media(max-width:960px){.grid.cols-3{grid-template-columns:repeat(2,1fr)}}
@media(max-width:640px){.grid.cols-2,.grid.cols-3{grid-template-columns:1fr}}

.card{
  display:flex;flex-direction:column;gap:12px;
  background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);
  padding:26px 26px 24px;
  transition:transform .18s ease,border-color .18s ease,box-shadow .18s ease;
}
a.card{color:inherit}
a.card:hover{transform:translateY(-4px);border-color:var(--accent-line);box-shadow:0 16px 40px rgba(0,0,0,.4)}
.card h3{font-size:19px}
.card p{color:var(--muted);font-size:14.5px;flex:1}
.card .cmd{
  align-self:flex-start;font-family:var(--mono);font-size:12.5px;color:var(--accent);
  background:var(--accent-soft);border:1px solid var(--accent-line);
  border-radius:7px;padding:4px 10px;
}
.card .tag{font-family:var(--mono);font-size:12px;color:var(--faint)}
.card-icon{
  width:42px;height:42px;border-radius:11px;flex:none;
  display:flex;align-items:center;justify-content:center;font-size:19px;
  background:var(--accent-soft);border:1px solid var(--accent-line);
}

/* ---------- callouts ---------- */
.callout{
  display:flex;gap:14px;align-items:flex-start;
  background:var(--accent-soft);border:1px solid var(--accent-line);
  border-radius:var(--radius-sm);padding:18px 20px;
  color:var(--text);font-size:14.5px;
}
.callout .callout-icon{flex:none;font-size:17px;line-height:1.5}
.callout p{color:var(--muted)}
.callout p b,.callout p strong{color:var(--text)}

/* ---------- code chips (install snippets) ---------- */
.chip{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--mono);font-size:13.5px;color:#e3e7f2;
  background:var(--panel);border:1px solid var(--line-2);
  border-radius:10px;padding:11px 18px;white-space:nowrap;
  max-width:100%;overflow-x:auto;
}
.chip::before{content:"$";color:var(--accent);font-weight:600;flex:none}
.chip.no-prompt::before{content:none}

/* ---------- chip stack (multi-line install snippets) ---------- */
.chip-stack{display:flex;flex-direction:column;gap:10px;align-items:center}
.chip-stack .chip{width:100%;max-width:480px;justify-content:flex-start}

/* ---------- text badges (host / cross-assistant band) ---------- */
.badge-row{display:flex;align-items:center;justify-content:center;flex-wrap:wrap;gap:12px}
.badge{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--display);font-weight:600;font-size:14.5px;color:var(--text);
  background:var(--panel);border:1px solid var(--line-2);border-radius:100px;
  padding:10px 22px;white-space:nowrap;
}
.badge::before{
  content:"";width:7px;height:7px;border-radius:50%;flex:none;
  background:linear-gradient(135deg,var(--accent),var(--accent-deep));
  box-shadow:0 0 10px var(--accent-glow);
}

/* ---------- pipeline strip ---------- */
.flow{
  display:flex;align-items:center;justify-content:center;flex-wrap:wrap;gap:10px;
  font-family:var(--mono);font-size:13px;
}
.flow .step{
  background:var(--panel);border:1px solid var(--line-2);border-radius:9px;
  padding:8px 14px;color:var(--text);
}
.flow .arrow{color:var(--faint)}

/* ---------- loop strip (skill pages: receives / hands off) ---------- */
.loop-strip{
  display:grid;grid-template-columns:1fr 1.15fr 1fr;gap:16px;align-items:stretch;
  max-width:920px;margin:0 auto;
}
.loop-cell{
  display:flex;flex-direction:column;gap:6px;
  background:var(--panel);border:1px solid var(--line);border-radius:var(--radius-sm);
  padding:18px 20px;color:inherit;
  transition:transform .18s ease,border-color .18s ease;
}
a.loop-cell:hover{transform:translateY(-3px);border-color:var(--accent-line);color:inherit}
.loop-cell.current{background:var(--accent-soft);border-color:var(--accent-line)}
.loop-label{
  font-family:var(--mono);font-size:11.5px;letter-spacing:.12em;text-transform:uppercase;
  color:var(--faint);
}
.loop-cell.current .loop-label{color:var(--accent)}
.loop-name{font-family:var(--display);font-weight:600;font-size:16px;color:var(--text)}
.loop-desc{font-size:13px;color:var(--muted)}
@media(max-width:760px){.loop-strip{grid-template-columns:1fr}}

/* ---------- prev/next skill nav ---------- */
.skillnav{display:grid;grid-template-columns:1fr 1fr;gap:16px;padding-top:8px;padding-bottom:32px}
.skillnav a{
  display:flex;flex-direction:column;gap:4px;
  background:var(--panel);border:1px solid var(--line);border-radius:var(--radius-sm);
  padding:16px 20px;
  transition:transform .18s ease,border-color .18s ease;
}
.skillnav a:hover{transform:translateY(-3px);border-color:var(--accent-line)}
.skillnav a.next{text-align:right;align-items:flex-end}
.skillnav .dir{font-family:var(--mono);font-size:12px;color:var(--faint)}
.skillnav .name{font-family:var(--display);font-weight:600;font-size:15.5px;color:var(--text)}
@media(max-width:640px){
  .skillnav{grid-template-columns:1fr}
  .skillnav a.next{text-align:left;align-items:flex-start}
}

/* ---------- host matrix table (install) ---------- */
.table-scroll{overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius-sm);background:var(--panel)}
table.matrix{width:100%;min-width:820px;border-collapse:collapse;font-size:14px;text-align:left}
.matrix th,.matrix td{padding:14px 18px;border-bottom:1px solid var(--line);vertical-align:top}
.matrix thead th{
  font-family:var(--mono);font-size:11.5px;letter-spacing:.12em;text-transform:uppercase;
  color:var(--faint);font-weight:500;background:var(--panel-2);white-space:nowrap;
}
.matrix tbody tr:last-child th,.matrix tbody tr:last-child td{border-bottom:none}
.matrix tbody th{font-family:var(--display);font-weight:600;color:var(--text);white-space:nowrap}
.matrix td{color:var(--muted)}
.matrix .yes{color:var(--good)}
.matrix .warn{color:var(--accent)}
.fn{font-size:13px;color:var(--faint);margin-top:16px;line-height:1.6}
.fn sup,sup.fnm{color:var(--accent);font-family:var(--mono);font-size:.75em}

/* ---------- command line + optional copy button ---------- */
.cmd-stack{display:flex;flex-direction:column;gap:10px}
.cmd-stack.center{max-width:560px;margin-left:auto;margin-right:auto}
.cmdline{display:flex;align-items:stretch;gap:8px;width:100%;min-width:0}
.cmdline .chip{flex:1;justify-content:flex-start;min-width:0}
.copy-btn{
  flex:none;font-family:var(--mono);font-size:12px;color:var(--muted);
  background:var(--panel);border:1px solid var(--line-2);border-radius:10px;
  padding:0 14px;cursor:pointer;
  transition:color .16s ease,border-color .16s ease;
}
.copy-btn:hover{color:var(--text);border-color:var(--accent-line)}
.copy-btn.copied{color:var(--good);border-color:var(--good)}
html:not(.js) .copy-btn{display:none}

/* ---------- quickstart steps ---------- */
.steps{counter-reset:step;display:flex;flex-direction:column;gap:16px;max-width:800px;margin:0 auto}
.steps > li{
  counter-increment:step;position:relative;
  background:var(--panel);border:1px solid var(--line);border-radius:var(--radius-sm);
  padding:20px 24px 20px 66px;color:var(--muted);font-size:15px;
}
.steps > li::before{
  content:counter(step,decimal-leading-zero);
  position:absolute;left:20px;top:23px;
  font-family:var(--mono);font-size:13px;color:var(--accent);
}
.steps > li b{color:var(--text)}
.steps .cmd-stack{margin-top:12px}
@media(max-width:640px){.steps > li{padding-left:24px;padding-top:44px}.steps > li::before{top:18px;left:24px}}

/* ---------- stage number (how-it-works cards) ---------- */
.card .num{font-family:var(--mono);font-size:12px;letter-spacing:.16em;color:var(--faint)}

/* ---------- flow steps as links ---------- */
.flow a.step{color:var(--text);transition:border-color .16s ease,color .16s ease}
.flow a.step:hover{border-color:var(--accent-line);color:var(--accent)}

/* ---------- pre highlights (artifact tree) ---------- */
pre .c{color:var(--faint)}
pre .a{color:var(--accent)}

/* ---------- footer ---------- */
.site-footer{
  border-top:1px solid var(--line);background:var(--bg-raise);
  padding:56px 0 40px;margin-top:48px;
}
.footer-cta{text-align:center;margin-bottom:40px}
.footer-cta h2{font-size:clamp(22px,3vw,30px);margin-bottom:10px}
.footer-cta p{color:var(--muted);margin-bottom:22px}
.footer-cta .chip{text-align:left}
.footer-meta{
  display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:14px;
  border-top:1px solid var(--line);padding-top:26px;
  font-size:13.5px;color:var(--faint);
}
.footer-meta a{color:var(--muted)}
.footer-meta a:hover{color:var(--text)}
.footer-links{display:flex;gap:22px;flex-wrap:wrap}
@media(max-width:640px){.footer-meta{flex-direction:column;text-align:center;justify-content:center}}

/* ---------- reveal on scroll ---------- */
html.js .reveal{opacity:0;transform:translateY(16px);transition:opacity .55s ease,transform .55s ease}
html.js .reveal.in{opacity:1;transform:none}

/* ---------- reduced motion ---------- */
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition-duration:.01ms !important;animation-duration:.01ms !important;animation-iteration-count:1 !important}
  html.js .reveal{opacity:1;transform:none}
  .btn-primary:hover,a.card:hover,a.loop-cell:hover,.skillnav a:hover{transform:none}
}

/* ---------- small screens ---------- */
@media(max-width:640px){
  section{padding:56px 0}
  .hero{padding:72px 0 56px}
  .btn{width:100%;max-width:340px}
  .nav-menu .btn{width:auto;max-width:none}
}