:root{
  color-scheme: light;

  --navy:#12304f;
  --blue:#1f5f9e;
  --sky:#2f7ec9;

  --bg:#f5f7fb;
  --bg-gradient:linear-gradient(180deg,#f8fbff 0,#f3f6fb 160px,var(--bg) 160px);
  --surface:#ffffff;
  --surface-alt:#edf3fb;
  --border:#d7e2f0;
  --text:#1f2937;
  --muted:#5f6b7a;
  --heading:#12304f;
  --link:#1f5f9e;

  --success-bg:#edf9f1;
  --success-border:#9fd8ae;
  --success-text:#22653b;
  --warning-bg:#fff6e8;
  --warning-border:#f0c680;
  --warning-text:#8a5b10;
  --danger-bg:#fff1f1;
  --danger-border:#efb0b0;
  --info-bg:#eef6ff;
  --info-border:#9dc2ec;

  --shadow:0 10px 28px rgba(18,48,79,.08);
  --shadow-strong:0 14px 32px rgba(18,48,79,.14);
  --radius:14px;

  --header-bg:rgba(255,255,255,.72);
  --header-border:rgba(18,48,79,.1);
  --header-text:#12304f;
  --header-shadow:0 10px 30px rgba(18,48,79,.10);
  --nav-chip-bg:rgba(18,48,79,.05);
  --nav-chip-border:rgba(18,48,79,.09);
  --nav-chip-hover-bg:rgba(18,48,79,.1);
  --nav-chip-active-bg:var(--navy);
  --nav-chip-active-text:#fff;

  --tag-bg:#eff4fb;
  --tag-text:var(--navy);
  --status-bg:var(--surface-alt);
  --status-text:var(--navy);
  --status-draft-bg:#f2f4f8;
  --status-draft-text:#5d6673;

  --code-bg:#0f2237;
  --code-text:#eff6ff;
  --image-bg:#ffffff;
  --lightbox-bg:rgba(10,20,34,.84);
}

[data-theme="dark"]{
  color-scheme: dark;

  --navy:#1e293b;
  --blue:#60a5fa;
  --sky:#38bdf8;

  --bg:#0b1220;
  --bg-gradient:linear-gradient(180deg,#0c1524 0,#0a1120 220px,var(--bg) 220px);
  --surface:#111a2e;
  --surface-alt:#152037;
  --border:#223350;
  --text:#e6edf8;
  --muted:#94a3b8;
  --heading:#e6edf8;
  --link:#60a5fa;

  --success-bg:rgba(34,101,59,.18);
  --success-border:rgba(110,200,140,.38);
  --success-text:#6edc9a;
  --warning-bg:rgba(138,91,16,.18);
  --warning-border:rgba(240,198,128,.38);
  --warning-text:#f3c56a;
  --danger-bg:rgba(178,52,52,.18);
  --danger-border:rgba(239,176,176,.32);
  --info-bg:rgba(49,130,206,.14);
  --info-border:rgba(96,165,250,.36);

  --shadow:0 10px 28px rgba(0,0,0,.45);
  --shadow-strong:0 14px 32px rgba(0,0,0,.55);

  --header-bg:rgba(13,22,40,.72);
  --header-border:rgba(255,255,255,.08);
  --header-text:#e6edf8;
  --header-shadow:0 10px 30px rgba(0,0,0,.45);
  --nav-chip-bg:rgba(255,255,255,.06);
  --nav-chip-border:rgba(255,255,255,.10);
  --nav-chip-hover-bg:rgba(255,255,255,.12);
  --nav-chip-active-bg:#60a5fa;
  --nav-chip-active-text:#0b1220;

  --tag-bg:rgba(96,165,250,.14);
  --tag-text:#cfe2ff;
  --status-bg:rgba(255,255,255,.06);
  --status-text:#cfe2ff;
  --status-draft-bg:rgba(255,255,255,.05);
  --status-draft-text:#94a3b8;

  --code-bg:#060d1b;
  --code-text:#e2ecff;
  --image-bg:#111a2e;
  --lightbox-bg:rgba(2,6,14,.88);
}

*,
*::before,
*::after{box-sizing:border-box}

html{scroll-behavior:smooth}

body{
  margin:0;
  font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  color:var(--text);
  background:var(--bg);
  background-image:var(--bg-gradient);
  line-height:1.6;
  transition:background-color .2s ease,color .2s ease;
}

a{color:var(--link);text-decoration:none}
a:hover{text-decoration:underline}

/* =========================================================================
   Modern floating header
   ========================================================================= */

.site-header{
  position:sticky;
  top:12px;
  z-index:50;
  padding:0 16px;
  margin-top:12px;
  pointer-events:none;
}

.site-header-inner{
  pointer-events:auto;
  max-width:1180px;
  margin:0 auto;
  padding:8px 10px 8px 18px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  background:var(--header-bg);
  color:var(--header-text);
  border:1px solid var(--header-border);
  border-radius:999px;
  backdrop-filter:saturate(160%) blur(16px);
  -webkit-backdrop-filter:saturate(160%) blur(16px);
  box-shadow:var(--header-shadow);
  transition:background-color .2s ease,border-color .2s ease,box-shadow .2s ease;
}

.brand{
  display:flex;
  flex-direction:column;
  align-items:flex-start;
  gap:1px;
  min-width:0;
  line-height:1.15;
}

.brand-home{
  color:var(--muted);
  font-size:10px;
  font-weight:600;
  letter-spacing:.12em;
  text-transform:uppercase;
  white-space:nowrap;
  overflow:hidden;
  text-overflow:ellipsis;
  max-width:min(60vw,520px);
}

.brand-home:hover{text-decoration:none;color:var(--heading)}

.brand-page{
  color:var(--header-text);
  font-size:16px;
  font-weight:600;
  letter-spacing:-.01em;
  white-space:nowrap;
  overflow:hidden;
  text-overflow:ellipsis;
  max-width:min(60vw,520px);
}

.brand-subtitle,
.brand-mark,
.brand-text,
.brand-title{display:none}

.site-nav{
  display:flex;
  align-items:center;
  gap:6px;
  flex-wrap:nowrap;
}

.site-nav a,
.site-nav button,
.nav-icon-btn{
  color:var(--header-text);
  background:var(--nav-chip-bg);
  border:1px solid var(--nav-chip-border);
  border-radius:999px;
  padding:7px 13px;
  font:inherit;
  font-size:13px;
  font-weight:500;
  cursor:pointer;
  text-decoration:none;
  transition:background-color .18s,border-color .18s,transform .18s,color .18s;
  white-space:nowrap;
}

.site-nav a:hover,
.site-nav button:hover,
.nav-icon-btn:hover{
  background:var(--nav-chip-hover-bg);
  text-decoration:none;
  transform:translateY(-1px);
}

.site-nav a.active{
  background:var(--nav-chip-active-bg);
  color:var(--nav-chip-active-text);
  border-color:transparent;
}

.inline-form{display:inline-flex}
.inline-form button{margin:0}

.site-nav .nav-icon-btn,
.nav-icon-btn{
  width:36px;
  height:36px;
  padding:0;
  display:inline-grid;
  place-items:center;
  line-height:0;
}

.site-nav .nav-icon-btn svg,
.nav-icon-btn svg{width:16px;height:16px;display:block}

.nav-toggle{display:none}

.site-nav-scrim{
  display:none;
  position:fixed;
  inset:0;
  background:rgba(10,18,34,.35);
  z-index:40;
  opacity:0;
  transition:opacity .2s ease;
}

.site-nav-scrim.open{
  display:block;
  opacity:1;
}

/* =========================================================================
   Page shell
   ========================================================================= */

.page-shell{
  max-width:1180px;
  margin:0 auto;
  padding:24px 24px 64px;
}

.hero{
  background:linear-gradient(135deg,var(--navy),var(--blue));
  color:#fff;
  border-radius:22px;
  padding:32px;
  box-shadow:var(--shadow);
  margin-bottom:24px;
}

.hero h1,
.hero h2{
  margin:0 0 10px;
  font-size:34px;
  line-height:1.15;
  letter-spacing:-.03em;
}

.hero p{
  margin:0;
  max-width:760px;
  color:rgba(255,255,255,.82);
  font-size:16px;
}

.hero-meta{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  margin-top:20px;
}

.pill{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:6px 12px;
  border-radius:999px;
  background:rgba(255,255,255,.12);
  border:1px solid rgba(255,255,255,.16);
  font-size:12px;
  color:#fff;
}

.grid{display:grid;gap:20px}
.grid-3{grid-template-columns:repeat(auto-fit,minmax(220px,1fr))}
.grid-2{grid-template-columns:repeat(auto-fit,minmax(280px,1fr))}

.card{
  background:var(--surface);
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:22px;
  box-shadow:var(--shadow);
}

.card h2,
.card h3{
  margin:0 0 10px;
  color:var(--heading);
  line-height:1.25;
}

.card p:last-child,
.card ul:last-child,
.card ol:last-child{margin-bottom:0}

.stats{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(160px,1fr));
  gap:14px;
}

.stat{
  background:var(--surface);
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:18px;
  box-shadow:var(--shadow);
}

.stat strong{
  display:block;
  font-size:28px;
  line-height:1.1;
  color:var(--heading);
}

.stat span{
  display:block;
  color:var(--muted);
  font-size:13px;
  margin-top:6px;
}

.section-title{
  margin:32px 0 16px;
  font-size:24px;
  letter-spacing:-.02em;
  color:var(--heading);
}

.lede{
  margin:0 0 18px;
  color:var(--muted);
  max-width:820px;
}

.callout{
  border-radius:var(--radius);
  border:1px solid var(--info-border);
  background:var(--info-bg);
  padding:16px 18px;
  margin:18px 0;
}

.callout strong{
  display:block;
  color:var(--heading);
  margin-bottom:6px;
}

.callout p:last-child,
.callout ul:last-child,
.callout ol:last-child{margin-bottom:0}

.callout.warning{background:var(--warning-bg);border-color:var(--warning-border)}
.callout.danger{background:var(--danger-bg);border-color:var(--danger-border)}
.callout.success{background:var(--success-bg);border-color:var(--success-border)}

.resource-list{display:grid;gap:14px}

.resource{
  background:var(--surface);
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:18px 20px;
  box-shadow:var(--shadow);
}

.resource-head{
  display:flex;
  justify-content:space-between;
  gap:10px;
  align-items:flex-start;
  flex-wrap:wrap;
}

.resource h3{margin:0;font-size:18px;color:var(--heading)}
.resource h3 a{color:inherit}

.resource p{
  margin:8px 0 0;
  color:var(--muted);
}

.status{
  display:inline-flex;
  align-items:center;
  padding:5px 10px;
  border-radius:999px;
  font-size:12px;
  font-weight:600;
  background:var(--status-bg);
  color:var(--status-text);
}

.status.live{
  background:var(--success-bg);
  color:var(--success-text);
}

.status.queued{
  background:var(--warning-bg);
  color:var(--warning-text);
}

.status.draft{
  background:var(--status-draft-bg);
  color:var(--status-draft-text);
}

.tag-row{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  margin-top:12px;
}

.tag{
  display:inline-flex;
  align-items:center;
  padding:4px 10px;
  border-radius:999px;
  background:var(--tag-bg);
  color:var(--tag-text);
  font-size:12px;
}

/* =========================================================================
   Tool tiles (launchers on /tools/)
   ========================================================================= */

.tool-grid{
  display:grid;
  grid-template-columns:repeat(auto-fill,minmax(200px,1fr));
  gap:16px;
  margin:0;
}

.tool-tile{
  display:flex;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  gap:14px;
  padding:28px 20px;
  background:var(--surface);
  border:1px solid var(--border);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
  color:var(--heading);
  text-decoration:none;
  text-align:center;
  transition:transform .18s ease, box-shadow .18s ease, border-color .18s ease, background-color .18s ease;
  min-height:160px;
}

.tool-tile:hover{
  transform:translateY(-2px);
  box-shadow:var(--shadow-strong);
  border-color:var(--blue);
  text-decoration:none;
  color:var(--heading);
}

.tool-tile:focus-visible{
  outline:2px solid var(--blue);
  outline-offset:3px;
}

.tool-tile-icon{
  width:56px;
  height:56px;
  display:grid;
  place-items:center;
  border-radius:16px;
  background:linear-gradient(135deg,var(--navy),var(--sky));
  color:#fff;
  box-shadow:0 8px 18px rgba(18,48,79,.22);
}

.tool-tile-icon svg{width:28px;height:28px;display:block}

.tool-tile-label{
  font-size:15px;
  font-weight:600;
  letter-spacing:-.01em;
  line-height:1.3;
}

.content-layout{
  display:grid;
  grid-template-columns:minmax(0,1fr) 280px;
  gap:22px;
  align-items:start;
}

.content-body{
  background:var(--surface);
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:28px;
  box-shadow:var(--shadow);
}

.content-body h2,
.content-body h3{
  color:var(--heading);
  margin-top:28px;
  margin-bottom:10px;
}

.content-body h2:first-child{margin-top:0}

.content-body ol,
.content-body ul{padding-left:22px}

.content-body li + li{margin-top:8px}

.sidebar{display:grid;gap:16px}

.sidebar .card{position:sticky;top:92px}

.meta-list{display:grid;gap:10px;margin:0}

.meta-list div{
  padding-bottom:10px;
  border-bottom:1px solid var(--border);
}

.meta-list div:last-child{border-bottom:none;padding-bottom:0}

.meta-list strong{
  display:block;
  font-size:12px;
  text-transform:uppercase;
  letter-spacing:.05em;
  color:var(--muted);
  margin-bottom:4px;
}

.equation{
  background:var(--code-bg);
  color:var(--code-text);
  border-radius:12px;
  padding:14px 16px;
  font-family:"Cascadia Code","Consolas","SFMono-Regular",monospace;
  font-size:14px;
  overflow:auto;
  margin:16px 0;
}

.content-image{
  display:block;
  width:100%;
  max-width:900px;
  margin:16px auto;
  border:1px solid var(--border);
  border-radius:12px;
  background:var(--image-bg);
  box-shadow:var(--shadow);
  cursor:zoom-in;
  transition:transform .18s ease, box-shadow .18s ease;
}

.content-image:hover{
  transform:translateY(-1px);
  box-shadow:var(--shadow-strong);
}

.content-image.narrow{max-width:420px}
.content-image.medium{max-width:620px}
.content-image.wide{max-width:820px}
.content-image.w200{max-width:200px}
.content-image.w250{max-width:250px}
.content-image.w300{max-width:300px}
.content-image.w350{max-width:350px}
.content-image.w400{max-width:400px}
.content-image.w450{max-width:450px}
.content-image.w500{max-width:500px}
.content-image.w600{max-width:600px}
.content-image.w650{max-width:650px}
.content-image.w700{max-width:700px}

.image-grid{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(240px,1fr));
  gap:16px;
  margin:18px 0;
}

.inline-icon{
  display:inline-block;
  vertical-align:middle;
  max-height:1.2em;
  width:auto;
  margin:0 .2em;
}

.inline-icon.sm{max-height:1.5em}
.inline-icon.md{max-height:1.9em}

.image-lightbox{
  position:fixed;
  inset:0;
  z-index:2000;
  display:none;
  align-items:center;
  justify-content:center;
  padding:28px;
  background:var(--lightbox-bg);
  backdrop-filter:blur(6px);
}

.image-lightbox.open{display:flex}

.image-lightbox-backdrop{position:absolute;inset:0}

.image-lightbox-dialog{
  position:relative;
  z-index:1;
  max-width:min(1200px,96vw);
  max-height:90vh;
  display:grid;
  gap:12px;
  justify-items:center;
}

.image-lightbox-dialog img{
  display:block;
  max-width:100%;
  max-height:calc(90vh - 56px);
  border-radius:14px;
  box-shadow:0 20px 50px rgba(0,0,0,.35);
  background:var(--image-bg);
}

.image-lightbox-caption{
  color:#fff;
  text-align:center;
  font-size:14px;
}

.image-lightbox-close{
  position:absolute;
  top:10px;
  right:10px;
  z-index:2;
  width:40px;
  height:40px;
  border:none;
  border-radius:999px;
  background:rgba(255,255,255,.14);
  color:#fff;
  font:inherit;
  font-size:20px;
  cursor:pointer;
}

.small-note{color:var(--muted);font-size:13px}

.footer-note{
  margin-top:28px;
  color:var(--muted);
  font-size:13px;
}

.site-disclaimer{
  margin-top:28px;
  padding:16px 18px;
  border:1px solid var(--warning-border);
  border-radius:var(--radius);
  background:var(--warning-bg);
  color:var(--text);
  font-size:13px;
  line-height:1.6;
}

.site-disclaimer strong{
  display:block;
  margin-bottom:6px;
  color:var(--heading);
}

/* =========================================================================
   Responsive
   ========================================================================= */

@media (max-width:960px){
  .content-layout{grid-template-columns:1fr}
  .sidebar .card{position:static}
}

@media (max-width:780px){
  .site-header{top:8px;margin-top:8px;padding:0 10px}
  .site-header-inner{padding:6px 8px 6px 14px;gap:8px}
  .brand-home{display:none}
  .brand-page{font-size:14px;max-width:60vw}

  .nav-toggle{
    display:inline-grid;
    place-items:center;
  }

  .site-nav{
    position:fixed;
    top:64px;
    right:10px;
    left:10px;
    flex-direction:column;
    align-items:stretch;
    gap:4px;
    padding:10px;
    background:var(--surface);
    border:1px solid var(--border);
    border-radius:16px;
    box-shadow:var(--shadow-strong);
    z-index:45;
    transform:translateY(-8px);
    opacity:0;
    visibility:hidden;
    transition:opacity .18s ease,transform .18s ease,visibility .18s ease;
  }

  .site-nav > * {color:var(--text)}

  .site-nav a,
  .site-nav button,
  .nav-icon-btn{
    width:100%;
    justify-content:flex-start;
    text-align:left;
    border-radius:10px;
    padding:10px 12px;
    color:var(--text);
    background:transparent;
    border-color:transparent;
  }

  .site-nav a:hover,
  .site-nav button:hover,
  .nav-icon-btn:hover{
    background:var(--surface-alt);
    transform:none;
  }

  .site-nav a.active{
    background:var(--nav-chip-active-bg);
    color:var(--nav-chip-active-text);
  }

  .nav-icon-btn{height:auto;width:100%}

  .site-nav.open{
    opacity:1;
    visibility:visible;
    transform:translateY(0);
  }

  .inline-form,
  .inline-form button{width:100%}

  .page-shell{padding:16px}
  .hero{padding:22px}
  .hero h1,.hero h2{font-size:26px}
  .hero p{font-size:15px}
  .content-body{padding:20px}
}

@media (max-width:420px){
  .brand-page{max-width:48vw;font-size:13px}
}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    transition-duration:.001ms !important;
    animation-duration:.001ms !important;
  }
}