/* ==========================================================================
   Rankus AI — rankusai.com
   Mobile-first. Every layout rule below starts at phone width and only
   widens at a breakpoint, so nothing has to be undone for small screens.
   ========================================================================== */

@font-face{
  font-family:'Manrope';
  font-style:normal;
  font-weight:200 800;          /* variable axis: one file covers every weight */
  font-display:swap;
  src:url('/assets/manrope.woff2') format('woff2');
}
@font-face{
  font-family:'IBM Plex Mono';
  font-style:normal;
  font-weight:400;
  font-display:swap;
  src:url('/assets/ibm-plex-mono-regular.woff2') format('woff2');
}
@font-face{
  font-family:'IBM Plex Mono';
  font-style:normal;
  font-weight:500;
  font-display:swap;
  src:url('/assets/ibm-plex-mono-medium.woff2') format('woff2');
}

:root{
  --accent:#1554F0;
  --accent-dark:#0B2B7A;
  --accent-mid:#3B74FF;
  --ink:#0B1220;

  --ground:#ffffff;
  --ground-tint:#F5F8FF;      /* chips, hero panel accents */
  --ground-soft:#FAFCFF;      /* footer, trust bar */
  --ground-icon:#EEF3FF;      /* icon tiles */

  --muted:#4A5670;
  --muted-2:#616E86;          /* darkened from #7A879F: 4.5:1+ vs every ground it sits on */
  --muted-3:#C3CDE2;          /* muted text on dark grounds */

  --line:#E6EBF5;
  --line-soft:#F0F3FA;
  --line-blue:#D6E0FA;

  --sans:'Manrope',system-ui,-apple-system,'Segoe UI',Helvetica,Arial,sans-serif;
  --mono:'IBM Plex Mono',ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  --gutter:20px;
  --maxw:1180px;

  /* Type scale. clamp() carries each size from phone to desktop, so there is
     no separate mobile font-size rule anywhere below. */
  --fs-display:clamp(2.1rem,7.6vw,3.625rem);     /* hero h1     → 58px */
  --fs-title:clamp(1.7rem,5.2vw,2.375rem);       /* section h2  → 38px */
  --fs-title-sm:clamp(1.5rem,4.4vw,2.125rem);    /* narrower h2 → 34px */
  --fs-card-title:clamp(1.2rem,3.4vw,1.3125rem); /* def card h3 → 21px */
  --fs-lead:clamp(1.0625rem,2.6vw,1.1563rem);    /* 17–18.5px   */
  --fs-body:1rem;
  --fs-small:.875rem;
  --fs-eyebrow:.75rem;
  --fs-mono-label:.75rem;
}

*,*::before,*::after{ box-sizing:border-box; margin:0; padding:0; }

html{ -webkit-text-size-adjust:100%; scroll-behavior:smooth; }
@media (prefers-reduced-motion:reduce){
  html{ scroll-behavior:auto; }
  *,*::before,*::after{ animation-duration:.01ms !important; animation-iteration-count:1 !important; transition-duration:.01ms !important; }
}

body{
  background:var(--ground);
  color:var(--ink);
  font:400 var(--fs-body)/1.55 var(--sans);
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}

img,svg,video{ display:block; max-width:100%; height:auto; }
a{ color:var(--accent); text-decoration:none; }
a:hover{ color:var(--accent-dark); text-decoration:underline; }
:focus-visible{ outline:3px solid var(--accent); outline-offset:2px; }

.wrap{ width:100%; max-width:var(--maxw); margin-inline:auto; padding-inline:var(--gutter); }

.mono-label{
  font-family:var(--mono); font-size:var(--fs-mono-label);
  letter-spacing:.08em; text-transform:uppercase; color:var(--muted-2);
}

.skip{
  position:absolute; left:-9999px; top:0; z-index:100;
  background:var(--ink); color:#fff; padding:12px 18px; font-weight:700;
}
.skip:focus{ left:0; }

/* --------------------------------------------------------------- header -- */
.site-header{
  position:sticky; top:0; z-index:30;
  background:rgba(255,255,255,.92);
  backdrop-filter:saturate(180%) blur(10px);
  border-bottom:1px solid var(--line);
}
.site-header__inner{
  display:flex; align-items:center; gap:14px;
  padding-block:14px;
}
.logo{ display:inline-flex; align-items:center; gap:9px; font-weight:800; font-size:1.125rem; letter-spacing:-.02em; text-decoration:none; color:var(--ink); }
.logo:hover{ text-decoration:none; }
.logo__mark{
  width:26px; height:26px; border-radius:7px; background:var(--accent);
  display:flex; align-items:center; justify-content:center; flex:0 0 auto;
  box-shadow:0 4px 12px rgba(21,84,240,.28);
}

.nav{ display:none; }                      /* phones use the menu button    */
.nav a{ font-size:var(--fs-small); font-weight:600; text-decoration:none; color:var(--muted); white-space:nowrap; padding:9px 14px; border-radius:8px; }
.nav a:hover{ color:var(--accent); background:var(--ground-tint); text-decoration:none; }

.btn{
  display:inline-flex; align-items:center; justify-content:center; gap:10px;
  font:700 .9375rem/1 var(--sans); text-decoration:none; cursor:pointer;
  padding:14px 22px; min-height:44px; border:1px solid transparent; border-radius:10px;
  transition:background-color .15s ease,color .15s ease,border-color .15s ease;
}
.btn:hover{ text-decoration:none; }
.btn--primary{ background:var(--accent); color:#fff; box-shadow:0 8px 20px rgba(21,84,240,.22); }
.btn--primary:hover{ background:var(--accent-dark); color:#fff; }
.btn--ghost{ background:#fff; color:var(--ink); border-color:#D8DFEC; }
.btn--ghost:hover{ border-color:var(--accent); color:var(--accent); }
.btn--small{ padding:11px 18px; font-size:.875rem; }
.btn--header{ margin-left:auto; }

.menu-toggle{
  display:inline-flex; align-items:center; justify-content:center; flex:0 0 auto;
  width:44px; height:44px; background:none; border:1px solid var(--line); border-radius:9px; cursor:pointer;
  margin-left:auto;
}
.menu-toggle span{ position:relative; display:block; width:18px; height:2px; background:var(--ink); }
.menu-toggle span::before,.menu-toggle span::after{ content:''; position:absolute; left:0; width:18px; height:2px; background:var(--ink); }
.menu-toggle span::before{ top:-6px; }
.menu-toggle span::after{ top:6px; }
.menu-toggle[aria-expanded="true"] span{ background:transparent; }
.menu-toggle[aria-expanded="true"] span::before{ top:0; transform:rotate(45deg); }
.menu-toggle[aria-expanded="true"] span::after{ top:0; transform:rotate(-45deg); }

.mobile-nav{ display:none; border-top:1px solid var(--line); background:#fff; }
.mobile-nav[data-open="true"]{ display:block; }
.mobile-nav a{
  display:block; padding:15px var(--gutter); font-weight:700; text-decoration:none; color:var(--ink);
  border-bottom:1px solid var(--line-soft);
}
.mobile-nav a:last-child{ border-bottom:0; }

/* ----------------------------------------------------------------- hero -- */
.hero{ position:relative; overflow:hidden; padding-block:44px 40px; }
.hero__grid{ display:grid; gap:36px; position:relative; }
.hero__kicker{
  display:inline-flex; align-items:center; gap:8px; padding:7px 13px;
  border:1px solid var(--line-blue); background:var(--ground-tint); border-radius:999px;
  font-family:var(--mono); font-size:.75rem; letter-spacing:.06em; text-transform:uppercase; color:var(--accent);
}
.hero__kicker::before{ content:''; width:6px; height:6px; border-radius:50%; background:var(--accent); box-shadow:0 0 0 3px rgba(21,84,240,.16); }
h1{ font-size:var(--fs-display); font-weight:800; line-height:1.05; letter-spacing:-.035em; margin-block:20px 18px; }
.hero__lead{ font-size:var(--fs-lead); line-height:1.6; color:var(--muted); max-width:46ch; }
.hero__actions{ display:flex; flex-direction:column; gap:12px; margin-top:26px; }
.hero__actions .btn{ width:100%; }
.hero__meta{
  margin-top:22px; display:flex; gap:22px; flex-wrap:wrap;
  font-size:.8125rem; color:var(--muted-2); font-family:var(--mono);
}

/* anatomy panel -------------------------------------------------------- */
.anatomy{
  border:1px solid var(--line); border-radius:18px; padding:20px; background:#fff;
  box-shadow:0 24px 60px rgba(11,18,32,.07);
}
.anatomy__label{ margin-bottom:14px; }
.anatomy__query{
  border:1px solid var(--line-blue); background:var(--ground-tint); border-radius:12px;
  padding:15px; margin-bottom:14px; font-size:.9375rem; line-height:1.6; color:var(--ink);
}
.anatomy__steps{ display:grid; gap:10px; }
.anatomy__step{
  display:flex; gap:12px; align-items:flex-start; padding:12px 14px;
  border:1px solid var(--line); border-radius:11px;
}
.anatomy__num{
  width:22px; height:22px; border-radius:6px; color:#fff; font-size:.6875rem; font-weight:700;
  display:flex; align-items:center; justify-content:center; flex:0 0 auto; font-family:var(--mono);
}
.anatomy__step:nth-child(1) .anatomy__num{ background:var(--accent); }
.anatomy__step:nth-child(2) .anatomy__num{ background:#5A8BF5; color:var(--ink); }
.anatomy__step:nth-child(3) .anatomy__num{ background:#9FBAF8; color:var(--ink); }
.anatomy__step h4{ font-size:.9688rem; font-weight:700; margin-bottom:3px; }
.anatomy__step p{ font-size:.8125rem; color:var(--muted); line-height:1.55; }
.anatomy__foot{
  margin-top:16px; padding-top:14px; border-top:1px dashed var(--line);
  font-size:.75rem; color:var(--muted-2); font-family:var(--mono);
}

/* ------------------------------------------------------------- systems -- */
.systems{ border-block:1px solid var(--line); background:var(--ground-soft); }
.systems__inner{
  padding-block:22px; display:flex; flex-wrap:wrap; gap:20px; align-items:center; justify-content:space-between;
}
.systems__list{ display:flex; flex-wrap:wrap; gap:20px 26px; font-weight:700; font-size:.9688rem; color:var(--ink); }

/* -------------------------------------------------------------- sections -- */
.section{ padding-block:52px; }
.section--tight{ padding-block:0 52px; }
.section__eyebrow{ font-size:.875rem; font-weight:800; letter-spacing:.1em; text-transform:uppercase; color:var(--muted); margin-bottom:20px; }
h2{ font-size:var(--fs-title); font-weight:800; line-height:1.1; letter-spacing:-.03em; }
.section__lead{ font-size:var(--fs-small); color:var(--muted); max-width:60ch; margin-top:10px; line-height:1.6; }

/* AEO/GEO definition cards ---------------------------------------------- */
.definitions__grid{ display:grid; gap:18px; margin-top:30px; }
.def-card{ border:1px solid var(--line); border-radius:16px; padding:26px; background:#fff; }
.def-card__icon{
  width:44px; height:44px; border-radius:12px; background:var(--ground-icon); border:1px solid var(--line-blue);
  display:flex; align-items:center; justify-content:center; margin-bottom:18px;
}
.def-card__eyebrow{ font-family:var(--mono); font-size:.6875rem; letter-spacing:.08em; text-transform:uppercase; color:var(--accent); margin-bottom:8px; }
.def-card h3{ font-size:var(--fs-card-title); font-weight:700; margin-bottom:10px; letter-spacing:-.01em; }
.def-card p{ font-size:.9375rem; line-height:1.65; color:var(--muted); margin-bottom:16px; }
.def-card ul{ list-style:none; display:grid; gap:8px; font-size:.9063rem; color:var(--muted); }
.def-card li{ display:flex; gap:9px; }
.def-card li::before{ content:'·'; color:var(--accent); font-weight:700; }

/* ----------------------------------------------------------- mechanics -- */
.mechanics__intro-visual{ display:none; }
.mechanics__grid{ display:grid; gap:28px; margin-top:36px; }
.mech-diagram{
  display:flex; flex-direction:column; justify-content:center;
  border:1px solid var(--line); border-radius:18px; padding:22px; background:#fff;
  box-shadow:0 24px 60px rgba(11,18,32,.07);
}
.mech-diagram__label{ margin-bottom:16px; }
.mech-diagram svg{ width:100%; height:auto; }
.mech-diagram__foot{
  margin-top:16px; padding-top:14px; border-top:1px dashed var(--line);
  font-size:.75rem; color:var(--muted-2); font-family:var(--mono);
}
.mechanics__steps{ display:grid; gap:14px; }
.mechanics__step{ display:flex; gap:14px; align-items:flex-start; padding:18px; border:1px solid var(--line); border-radius:14px; background:#fff; }
.mechanics__num{
  width:26px; height:26px; border-radius:7px; background:var(--accent); color:#fff; font-size:.75rem; font-weight:700;
  display:flex; align-items:center; justify-content:center; flex:0 0 auto; font-family:var(--mono);
}
.mechanics__step:nth-child(2) .mechanics__num{ background:#5A8BF5; color:var(--ink); }
.mechanics__step:nth-child(3) .mechanics__num{ background:#9FBAF8; color:var(--ink); }
.mechanics__step h3{ font-size:1.0625rem; font-weight:700; margin-bottom:8px; letter-spacing:-.01em; }
.mechanics__step p{ font-size:.9063rem; line-height:1.65; color:var(--muted); }

.mechanics__close{ margin-top:40px; padding-top:36px; border-top:1px solid var(--line); }
.mechanics__close h3{ font-size:1.0625rem; font-weight:700; margin-bottom:14px; letter-spacing:-.01em; }
.mechanics__close-text > p{ font-size:.9688rem; line-height:1.7; color:var(--muted); max-width:74ch; }
.mech-tags{ list-style:none; display:flex; flex-wrap:wrap; gap:10px; margin-top:20px; }
.mech-tags li{
  font-family:var(--mono); font-size:.6875rem; letter-spacing:.04em; text-transform:uppercase;
  color:var(--accent); background:var(--ground-tint); border:1px solid var(--line-blue);
  border-radius:999px; padding:8px 14px;
}
.mechanics__cta{ margin-top:20px; font-size:.9688rem; color:var(--muted); }
.mechanics__cta a{ font-weight:700; }

/* --------------------------------------------------------------- posts -- */
.latest__head{ display:flex; justify-content:space-between; align-items:flex-end; gap:20px; flex-wrap:wrap; margin-bottom:24px; }
.latest__grid{ display:grid; gap:16px; }
.post-card{
  display:flex; flex-direction:column; gap:12px; min-height:170px;
  border:1px solid var(--line); border-radius:14px; padding:22px; background:#fff; text-decoration:none; color:inherit;
}
.post-card:hover{ border-color:var(--accent); box-shadow:0 12px 28px rgba(21,84,240,.09); text-decoration:none; }
.post-card__meta{ display:flex; justify-content:space-between; align-items:center; font-family:var(--mono); font-size:.6875rem; letter-spacing:.08em; text-transform:uppercase; }
.post-card__tag{ color:var(--accent); }
.post-card__date{ color:var(--muted-2); }
.post-card__title{ font-size:1.0313rem; font-weight:700; line-height:1.35; }
.post-card:hover .post-card__title{ color:var(--accent); }
.post-card__excerpt{ font-size:.875rem; line-height:1.55; color:var(--muted); }
.post-card__foot{ margin-top:auto; display:flex; align-items:center; gap:8px; font-size:.8125rem; color:var(--muted-2); }
.post-card__foot svg{ flex:0 0 auto; }

.blog-empty{ border-top:1px solid var(--line); padding-top:26px; color:var(--muted); font-size:1rem; }

/* stat band -------------------------------------------------------------- */
.statband{ position:relative; overflow:hidden; background:var(--ground-tint); border-block:1px solid var(--line); }
.statband__inner{ padding-block:44px; }
.statband__grid{ display:grid; gap:28px; margin-top:8px; }
.statband__num{ font-size:clamp(2rem,6vw,2.75rem); font-weight:800; letter-spacing:-.03em; color:var(--accent); }
.statband__label{ font-size:.9375rem; color:var(--muted); margin-top:8px; line-height:1.55; }

/* -------------------------------------------------------------- glossary -- */
.glossary{
  display:grid; gap:1px; background:var(--line); border:1px solid var(--line); border-radius:16px; overflow:hidden; margin-top:24px;
}
.glossary__item{ background:#fff; padding:24px; }
.glossary__word{ font-weight:700; font-size:1.0313rem; margin-bottom:8px; }
.glossary__def{ font-size:.9063rem; line-height:1.6; color:var(--muted); }

/* --------------------------------------------------------------- cta band -- */
.cta-band{
  position:relative; overflow:hidden; border-radius:18px; padding:36px 28px;
  background:var(--ink); color:#fff; display:grid; gap:22px; align-items:center;
}
.cta-band h2,.cta-band h3{ color:#fff; }
.cta-band p{ color:var(--muted-3); font-size:1rem; line-height:1.6; }
.cta-band .btn--primary{ justify-self:start; }

/* --------------------------------------------------------------- footer -- */
.site-footer{ background:var(--ground-soft); color:var(--muted); padding-block:44px 0; border-top:1px solid var(--line); }
.site-footer__top{ display:grid; gap:30px; padding-bottom:34px; }
.site-footer .logo{ color:var(--ink); }
.site-footer__tagline{ font-size:var(--fs-small); margin-top:14px; max-width:34ch; line-height:1.6; }
.site-footer__social{ display:flex; gap:8px; margin-top:20px; }
.site-footer__social a{
  width:36px; height:36px; border-radius:10px; border:1px solid var(--line); background:#fff;
  display:flex; align-items:center; justify-content:center;
}
.site-footer__social a:hover{ border-color:var(--accent); background:var(--ground-tint); }
.site-footer__cols{ display:grid; gap:26px; }
.site-footer h3{ font-family:var(--mono); font-size:.75rem; font-weight:700; letter-spacing:.08em; text-transform:uppercase; color:var(--ink); margin-bottom:12px; }
.site-footer li{ list-style:none; }
.site-footer li + li{ margin-top:8px; }
.site-footer a{ font-size:var(--fs-small); text-decoration:none; color:var(--muted); }
.site-footer a:hover{ color:var(--accent); }
.site-footer__legal{ margin-top:20px; padding-block:18px; border-top:1px solid var(--line); font-size:.8438rem; display:flex; justify-content:space-between; flex-wrap:wrap; gap:10px; }

/* -------------------------------------------------------------- journal -- */
.teasers{ display:grid; }
.teaser{
  display:block; text-decoration:none; padding-block:26px;
  border-top:1px solid var(--line); color:inherit;
}
.teaser > span{ display:block; }
.teaser__kicker{ font-family:var(--mono); font-size:.6875rem; font-weight:700; letter-spacing:.1em; text-transform:uppercase; color:var(--accent); }
.teaser__title{ font-size:clamp(1.1875rem,4vw,1.375rem); font-weight:800; letter-spacing:-.02em; line-height:1.2; margin-top:10px; }
.teaser:hover .teaser__title{ color:var(--accent); }
.teaser:hover{ text-decoration:none; }
.teaser__excerpt{ font-size:.9375rem; color:var(--muted); margin-top:8px; max-width:60ch; }
.teaser__meta{ font-size:.75rem; color:var(--muted-2); margin-top:10px; font-family:var(--mono); }

/* --------------------------------------------------------- standing pages -- */
.legal{ padding-block:44px 64px; }
.legal .kicker{ color:var(--accent); font-family:var(--mono); font-size:.75rem; font-weight:700; letter-spacing:.1em; text-transform:uppercase; }
.legal h1{ margin-top:12px; }
.legal .eff{ color:var(--muted-2); font-size:.875rem; margin-top:10px; }
.legal .intro{ margin-top:20px; max-width:62ch; color:var(--muted); font-size:1.0625rem; line-height:1.65; }
.legal h2{ font-size:1.375rem; font-weight:800; letter-spacing:-.01em; margin-top:40px; padding-top:20px; border-top:1px solid var(--line); }
.legal h3{ font-size:1.0625rem; font-weight:700; margin-top:20px; }
.legal p{ margin-top:12px; max-width:66ch; color:var(--muted); line-height:1.65; }
.legal ul{ margin-top:12px; padding-left:20px; }
.legal li{ margin:8px 0; max-width:64ch; color:var(--muted); line-height:1.65; }
.legal a{ font-weight:600; }
.legal strong{ font-weight:700; color:var(--ink); }
.legal .table{ margin-top:16px; border-top:1px solid var(--line); }
.legal .row{ display:grid; gap:6px; padding:16px 0; border-bottom:1px solid var(--line); }
.legal .row b{ font-size:.9375rem; color:var(--ink); }
.legal .row span{ font-size:.9063rem; color:var(--muted); }
.legal .card{ margin-top:16px; border:1px solid var(--line); border-radius:14px; padding:22px; background:var(--ground-tint); }
.legal .card b{ display:block; font-size:.9063rem; margin-bottom:6px; color:var(--muted); }
.legal .card a.big{ font-size:1.125rem; font-weight:700; }
.legal .links{ display:flex; gap:20px; margin-top:16px; flex-wrap:wrap; }

/* author bio block (about page + post byline share this look) ------------- */
.bio{ display:flex; flex-direction:column; gap:16px; margin-top:26px; border:1px solid var(--line); border-radius:16px; padding:24px; background:#fff; }
.bio__avatar{ width:72px; height:72px; border-radius:50%; object-fit:cover; background:var(--ground-icon); border:1px solid var(--line-blue); flex:0 0 auto; }
.bio__name{ font-size:1.25rem; font-weight:800; letter-spacing:-.01em; margin:0 0 6px; }
.bio .role{ font-family:var(--mono); font-size:.75rem; color:var(--accent); text-transform:uppercase; letter-spacing:.08em; margin-bottom:10px; }
.bio p{ font-size:.9688rem; line-height:1.65; color:var(--muted); max-width:60ch; }
.bio__link{ display:inline-flex; align-items:center; gap:6px; margin-top:14px; font-weight:700; font-size:.9375rem; color:var(--accent); }
.bio__link:hover{ color:var(--accent-dark); }

/* =========================================================== breakpoints == */
@media (min-width:600px){
  :root{ --gutter:28px; }
  .hero__actions{ flex-direction:row; }
  .hero__actions .btn{ width:auto; }
  .definitions__grid{ grid-template-columns:1fr 1fr; }
  .mechanics__grid{ grid-template-columns:1.1fr .9fr; }
  .latest__grid{ grid-template-columns:repeat(2,1fr); }
  .statband__grid{ grid-template-columns:repeat(3,1fr); }
  .glossary{ grid-template-columns:repeat(2,1fr); }
  .site-footer__cols{ grid-template-columns:repeat(2,1fr); }
  .cta-band{ grid-template-columns:1fr auto; padding:40px; }
  .bio{ flex-direction:row; align-items:flex-start; }
  .bio__avatar{ width:96px; height:96px; }
}

@media (min-width:900px){
  :root{ --gutter:40px; }
  .nav{ display:flex; gap:6px; margin-left:32px; }
  .menu-toggle{ display:none; }
  .mobile-nav{ display:none !important; }
  .site-header__inner{ padding-block:16px; }

  .hero{ padding-block:88px 64px; }
  .hero__grid{ grid-template-columns:1.05fr .95fr; gap:56px; align-items:center; }

  .section{ padding-block:82px; }
  .latest__grid{ grid-template-columns:repeat(4,1fr); }
  .site-footer__top{ grid-template-columns:1.4fr repeat(2,1fr); }
  .site-footer__cols{ display:contents; }
}

@media (min-width:1000px){
  .mechanics__intro{ display:grid; grid-template-columns:minmax(0,1fr) minmax(240px,300px); gap:48px; align-items:center; }
  .mechanics__intro-visual{ display:flex; flex-direction:column; align-items:center; gap:14px; }
  .mechanics__intro-visual svg{ width:100%; height:auto; max-width:280px; }
  .mechanics__intro-visual-label{ text-align:center; }

  .mechanics__close{ display:grid; grid-template-columns:minmax(0,1fr) minmax(200px,260px); gap:48px; align-items:center; }
  .mech-tags{ display:grid; grid-template-columns:1fr 1fr; gap:10px; margin-top:0; align-self:center; }
  .mech-tags li{ text-align:center; }
}