/* =========================================================
   SEPTIM LABS — site stylesheet
   v2 — tech-forward · sans-only · neon-accent · dark default
   Default theme = dark. Light is a fully-supported toggle.
   Per-product neon set via --p (cyan/violet/magenta/lime/etc).
   ========================================================= */

/* ── Base tokens ─────────────────────────────────────────── */
:root, [data-theme="dark"] {
  --bg:        #050507;
  --bg-1:      #0a0b0e;
  --bg-2:      #101116;
  --bg-3:      #181a21;
  --ink:       #eef0f4;
  --ink-2:     #9aa0ad;
  --ink-3:     #5b6070;
  --ink-4:     #353945;
  --line:      rgba(255,255,255,.06);
  --line-2:    rgba(255,255,255,.12);
  --line-3:    rgba(255,255,255,.22);
  --shade:     rgba(255,255,255,.025);
  --field-bg:  rgba(255,255,255,.03);
  --field-bg-2:rgba(255,255,255,.06);

  /* the neon palette — each product gets exactly one */
  --n-cyan:    #00ffd1;
  --n-aqua:    #22d3ee;
  --n-blue:    #3b82f6;
  --n-violet:  #7c5cff;
  --n-iris:    #a855f7;
  --n-magenta: #ff3d8a;
  --n-rose:    #f43f5e;
  --n-coral:   #ff6b4a;
  --n-amber:   #ffb020;
  --n-gold:    #fbbf24;
  --n-lime:    #caff00;
  --n-mint:    #4ade80;
  --n-teal:    #14b8a6;
  --n-red:     #ff4d4d;

  /* default site accent (cyan). product pages override --p */
  --p:         var(--n-cyan);
  --p-soft:    color-mix(in srgb, var(--p) 14%, transparent);
  --p-glow:    color-mix(in srgb, var(--p) 50%, transparent);
  --accent:    var(--p);
  --accent-soft: var(--p-soft);

  --grain-mix: overlay;
  color-scheme: dark;
}

[data-theme="light"] {
  --bg:        #ffffff;
  --bg-1:      #f7f8fa;
  --bg-2:      #f0f1f5;
  --bg-3:      #e6e8ee;
  --ink:       #0a0b0e;
  --ink-2:     #4a4f5b;
  --ink-3:     #777d8a;
  --ink-4:     #b4b8c2;
  --line:      rgba(10,11,14,.08);
  --line-2:    rgba(10,11,14,.16);
  --line-3:    rgba(10,11,14,.28);
  --shade:     rgba(10,11,14,.025);
  --field-bg:  rgba(10,11,14,.025);
  --field-bg-2:rgba(10,11,14,.05);

  --n-cyan:    #00b894;
  --n-aqua:    #0891b2;
  --n-blue:    #2563eb;
  --n-violet:  #6244e6;
  --n-iris:    #8b3fd6;
  --n-magenta: #d6276c;
  --n-rose:    #c51d3e;
  --n-coral:   #d94e2c;
  --n-amber:   #b87100;
  --n-gold:    #a37500;
  --n-lime:    #6a8a00;
  --n-mint:    #2d8b50;
  --n-teal:    #0d8b7a;
  --n-red:     #d23030;

  --grain-mix: multiply;
  color-scheme: light;
}

/* ── Type ────────────────────────────────────────────────── */
:root{
  --sans:'Geist', 'Inter', system-ui, -apple-system, sans-serif;
  --mono:'Geist Mono', 'JetBrains Mono', ui-monospace, Menlo, monospace;
  /* legacy --serif retained but maps to sans (no serifs anywhere) */
  --serif: var(--sans);
}

*{box-sizing:border-box}
/* Reserve space above any anchor scroll target so the fixed nav doesn't
   clip it. Same value applied as scroll-margin-top on every heading +
   common pill/eyebrow elements so in-page links and the back-forward
   cache restoration both land below the nav, not behind it. */
html{scroll-padding-top:96px}
html,body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--sans);
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
  transition:background .35s ease, color .35s ease}
body{min-height:100vh;overflow-x:hidden;font-feature-settings:"ss01","cv11"}
h1,h2,h3,h4,h5,h6,.eyebrow,.section-label,.coming-soon-badge,.article-hero,.hero,[id]{scroll-margin-top:96px}
::selection{background:var(--p);color:#000}

a{color:inherit}
hr{border:0;border-top:1px solid var(--line);margin:0}

/* ── Crosshair / grid helpers ────────────────────────────── */
.bg-grid{
  background-image:
    linear-gradient(to right, var(--line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line) 1px, transparent 1px);
  background-size: 80px 80px;
}
.bg-dotgrid{
  background-image:radial-gradient(var(--line-2) 1px, transparent 1px);
  background-size:24px 24px;
}

/* ── Nav ─────────────────────────────────────────────────── */
/* Transparent at top of page (so it never blocks the hero / first
   heading), fills in with the bg + blur once the user scrolls past
   8px. Class `.scrolled` is toggled by site.js on scroll. */
nav.nav{position:fixed;top:0;left:0;right:0;z-index:50;display:flex;align-items:center;
  justify-content:space-between;padding:14px clamp(20px,4vw,40px);
  font-family:var(--mono);font-size:11.5px;letter-spacing:.02em;
  background:transparent;
  backdrop-filter:none;-webkit-backdrop-filter:none;
  border-bottom:1px solid transparent;
  transition:background .25s ease, backdrop-filter .25s ease, border-color .25s ease}
nav.nav.scrolled{
  background:color-mix(in srgb, var(--bg) 78%, transparent);
  backdrop-filter:blur(20px) saturate(140%);-webkit-backdrop-filter:blur(20px) saturate(140%);
  border-bottom-color:var(--line)}
nav.nav .brand{display:flex;align-items:center;gap:10px;color:var(--ink);text-decoration:none;font-weight:500}
nav.nav .brand .mark{width:24px;height:24px;display:inline-block;color:var(--p);flex-shrink:0;filter:drop-shadow(0 0 6px color-mix(in srgb,var(--p) 45%, transparent))}
nav.nav .brand .mark svg{width:100%;height:100%;display:block;overflow:visible}
nav.nav .brand b{font-weight:600;letter-spacing:.04em}
nav.nav .brand .num{color:var(--p);font-weight:600}
nav.nav .brand .ver{color:var(--ink-3);margin-left:6px;font-weight:400;font-family:var(--mono);font-size:10px;letter-spacing:.06em}
nav.nav .links{display:flex;gap:6px;align-items:center}
nav.nav .links a{text-decoration:none;color:var(--ink-2);padding:8px 12px;border-radius:6px;
  position:relative;transition:color .2s, background .2s;font-weight:500}
nav.nav .links a:hover{color:var(--ink);background:var(--shade)}
nav.nav .links a.active{color:var(--ink)}
nav.nav .links a.active::before{content:"";position:absolute;left:12px;right:12px;bottom:2px;height:1px;background:var(--p);box-shadow:0 0 8px var(--p)}
nav.nav .links a[data-p="contact"]{color:var(--ink);border:1px solid var(--line-2);margin-left:6px}
nav.nav .links a[data-p="contact"]:hover{border-color:var(--p);color:var(--p);background:transparent}

/* Theme toggle (mono pill) */
.theme-toggle{appearance:none;border:1px solid var(--line-2);background:transparent;color:var(--ink-2);
  font:inherit;font-family:var(--mono);font-size:10.5px;letter-spacing:.08em;
  width:48px;height:24px;border-radius:99px;display:inline-flex;align-items:center;
  padding:2px;cursor:default;position:relative;transition:border-color .25s, background .25s;margin-left:6px}
.theme-toggle::before{content:"";width:18px;height:18px;border-radius:99px;background:var(--ink);transition:transform .35s cubic-bezier(.2,.8,.2,1), background .25s}
[data-theme="light"] .theme-toggle::before{transform:translateX(22px);background:var(--ink)}
.theme-toggle:hover{border-color:var(--p)}

/* ── Language selector ───────────────────────────────────
   Globe icon + the word "Language" cycling through all 10 supported
   languages every 1.6s. Always visible in the nav so people SEE that
   localized content exists. Click → dropdown menu of all languages. */
.lang-wrap{position:relative;margin-left:8px;display:inline-flex;align-items:center}
.lang-btn{appearance:none;border:1px solid var(--line-2);background:transparent;color:var(--ink-2);
  font:inherit;font-family:var(--mono);font-size:10.5px;letter-spacing:.08em;text-transform:uppercase;
  display:inline-flex;align-items:center;gap:6px;padding:5px 10px 5px 8px;border-radius:99px;
  cursor:pointer;transition:border-color .25s, color .25s, background .25s;min-width:118px;justify-content:center}
.lang-btn:hover,.lang-btn[aria-expanded="true"]{border-color:var(--p);color:var(--p);background:color-mix(in srgb,var(--p) 6%,transparent)}
.lang-cycle{display:inline-block;min-width:60px;text-align:center;font-weight:500;letter-spacing:.06em;
  text-transform:none}
.lang-arrow{font-size:10px;opacity:.7;margin-left:2px}
/* Hidden by default. The HTML [hidden] attribute should normally do this,
   but display:flex would override it — explicit rule keeps it dismissed
   until the user clicks the button. */
.lang-menu[hidden]{display:none}
.lang-menu{position:absolute;top:calc(100% + 8px);right:0;min-width:200px;
  background:color-mix(in srgb,var(--bg) 92%,transparent);
  backdrop-filter:blur(14px) saturate(140%);-webkit-backdrop-filter:blur(14px) saturate(140%);
  border:1px solid var(--line-2);border-radius:10px;padding:6px;
  box-shadow:0 12px 36px -12px color-mix(in srgb,#000 60%,transparent);z-index:60;
  display:flex;flex-direction:column;gap:1px}
.lang-menu .lang-opt{display:flex;align-items:center;justify-content:space-between;
  padding:9px 12px;border-radius:6px;color:var(--ink-2);text-decoration:none;
  font-family:var(--sans);font-size:13px;letter-spacing:0;text-transform:none;font-weight:500;
  transition:background .15s,color .15s}
.lang-menu .lang-opt:hover{background:var(--shade);color:var(--ink)}
.lang-menu .lang-opt.active{color:var(--p);background:color-mix(in srgb,var(--p) 10%,transparent)}
.lang-menu .lang-opt.active::before{content:"✓ ";color:var(--p);margin-right:4px;font-weight:700}
.lang-menu .lang-name{flex:1}
.lang-menu .lang-code{font-family:var(--mono);font-size:10px;letter-spacing:.12em;color:var(--ink-3);
  text-transform:uppercase;border:1px solid var(--line);border-radius:4px;padding:2px 6px;margin-left:10px}
.lang-menu .lang-opt.active .lang-code{color:var(--p);border-color:color-mix(in srgb,var(--p) 40%,transparent)}
@media (max-width: 880px){
  .lang-btn{min-width:0;padding:5px 8px}
  .lang-cycle{min-width:48px;font-size:10px}
  .lang-menu{right:auto;left:0}
}

/* ── Type primitives ─────────────────────────────────────── */
.eyebrow{font-family:var(--mono);font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--ink-2);
  display:inline-flex;align-items:center;gap:10px}
.eyebrow .num{color:var(--p);font-weight:500}
.eyebrow .div{width:24px;height:1px;background:var(--line-2)}
.eyebrow .dot{width:7px;height:7px;border-radius:50%;background:var(--p);box-shadow:0 0 12px var(--p)}

.h-display{font-weight:600;letter-spacing:-.04em;line-height:.96;font-size:clamp(3rem,7vw,6rem);margin:0}
.h-section{font-size:clamp(2rem,4vw,3.4rem);font-weight:600;letter-spacing:-.035em;line-height:1.02;margin:0}
/* italic emphasis -> upright but with the neon accent + monospace flavor */
.h-display em, .h-section em{font-style:normal;color:var(--p);font-weight:600}
em.tk, .tk{font-style:normal;color:var(--p);font-weight:600}

.lead{font-size:clamp(15.5px,1.3vw,18px);line-height:1.6;color:var(--ink-2);max-width:62ch;text-wrap:pretty}
.lead em{font-style:normal;color:var(--ink);font-weight:500}

.mono-line{font-family:var(--mono);font-size:11.5px;color:var(--ink-3);letter-spacing:.04em}
.mono-line .pre{color:var(--p);opacity:.9;margin-right:6px}
.mono-line .sep{color:var(--ink-4);padding:0 10px}

/* ── Buttons ─────────────────────────────────────────────── */
.btn{
  --bx:0;--by:0;
  position:relative;display:inline-flex;align-items:center;gap:10px;
  padding:13px 18px;border-radius:6px;
  font:500 13.5px/1 var(--sans);letter-spacing:-.005em;
  cursor:default;text-decoration:none;color:#000;
  background:var(--p);
  transform:translate(var(--bx),var(--by));
  transition:transform .3s cubic-bezier(.2,.8,.2,1), background .2s, box-shadow .25s, color .2s;
  box-shadow:0 0 0 1px color-mix(in srgb, var(--p) 60%, transparent),
             0 0 28px -6px var(--p-glow);
}
.btn .arr{display:inline-block;transition:transform .3s cubic-bezier(.2,.8,.2,1)}
.btn:hover{box-shadow:0 0 0 1px var(--p), 0 0 38px -4px var(--p-glow)}
.btn:hover .arr{transform:translateX(3px)}
.btn.ghost{background:transparent;color:var(--ink);box-shadow:inset 0 0 0 1px var(--line-2)}
.btn.ghost:hover{box-shadow:inset 0 0 0 1px var(--p);color:var(--p)}
[data-theme="light"] .btn{color:#fff}

/* a thin code-bracketed link */
.lnk{color:var(--p);text-decoration:none;font-family:var(--mono);font-size:12px;letter-spacing:.04em;
  display:inline-flex;align-items:center;gap:6px;transition:gap .25s, opacity .2s}
.lnk::before{content:"[";color:var(--ink-4)}
.lnk::after{content:"]";color:var(--ink-4)}
.lnk:hover{gap:10px}

/* ── Section chrome ──────────────────────────────────────── */
section.bay{position:relative;padding:clamp(80px,10vw,140px) clamp(20px,5vw,72px);border-bottom:1px solid var(--line)}
.bay-head{display:flex;align-items:flex-end;justify-content:space-between;gap:32px;margin-bottom:56px;flex-wrap:wrap}
.bay-head .h-section{margin-top:18px;max-width:22ch}

/* ── Reveal ──────────────────────────────────────────────── */
.reveal{opacity:0;transform:translateY(20px);transition:opacity .7s ease, transform .7s ease}
.reveal.in{opacity:1;transform:none}
.reveal-stagger>*{opacity:0;transform:translateY(16px);transition:opacity .6s ease, transform .6s ease}
.reveal-stagger.in>*{opacity:1;transform:none}

/* ── Footer ──────────────────────────────────────────────── */
footer.foot{padding:64px clamp(20px,5vw,72px) 32px;border-top:1px solid var(--line);
  display:grid;grid-template-columns:1.6fr repeat(4,1fr);gap:48px;align-items:flex-start;background:var(--bg-1)}
footer.foot .col h4{font-family:var(--mono);font-size:10.5px;letter-spacing:.12em;text-transform:uppercase;color:var(--ink-3);margin:0 0 14px;font-weight:500}
footer.foot .col a{display:block;color:var(--ink-2);text-decoration:none;font-size:13.5px;line-height:1.9;transition:color .2s}
footer.foot .col a:hover{color:var(--p)}
footer.foot .about{color:var(--ink-2);font-size:13.5px;line-height:1.55;max-width:36ch}
footer.foot .about em{font-style:normal;color:var(--ink);font-weight:500}
.foot-bot{padding:18px clamp(20px,5vw,72px);border-top:1px solid var(--line);display:flex;justify-content:space-between;
  font-family:var(--mono);font-size:10.5px;color:var(--ink-3);letter-spacing:.08em;text-transform:uppercase;background:var(--bg-1);flex-wrap:wrap;gap:16px;align-items:center}
.foot-bot .status{display:inline-flex;align-items:center;gap:8px}
.foot-bot .status .dot{width:6px;height:6px;border-radius:50%;background:var(--n-lime);box-shadow:0 0 8px var(--n-lime);animation:pulse 2.4s infinite}

/* ── Subtle grain ─────────────────────────────────────────── */
.grain{position:fixed;inset:0;pointer-events:none;z-index:1;opacity:.04;mix-blend-mode:var(--grain-mix);
  background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='160' height='160'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2' stitchTiles='stitch'/></filter><rect width='100%' height='100%' filter='url(%23n)' opacity='.7'/></svg>")}
[data-theme="light"] .grain{opacity:.05}

/* ── Forms ───────────────────────────────────────────────── */
input,textarea,select{
  background:var(--field-bg);color:var(--ink);
  border:1px solid var(--line-2);border-radius:4px;padding:12px 14px;font:14px/1.4 var(--sans);
  outline:none;transition:border-color .2s, background .2s, box-shadow .2s;width:100%
}
input:focus,textarea:focus,select:focus{border-color:var(--p);background:var(--field-bg-2);box-shadow:0 0 0 3px var(--p-soft)}
label{font-family:var(--mono);font-size:10.5px;letter-spacing:.1em;color:var(--ink-3);text-transform:uppercase}

/* ── Status pills / tags ─────────────────────────────────── */
.pill{display:inline-flex;align-items:center;gap:6px;font-family:var(--mono);font-size:10.5px;letter-spacing:.08em;text-transform:uppercase;padding:4px 9px;border-radius:99px;border:1px solid var(--line-2);color:var(--ink-2)}
.pill .d{width:6px;height:6px;border-radius:50%;background:var(--p);box-shadow:0 0 8px var(--p)}
.pill.ok{color:var(--n-lime);border-color:color-mix(in srgb,var(--n-lime) 40%,transparent)}.pill.ok .d{background:var(--n-lime);box-shadow:0 0 8px var(--n-lime)}
.pill.warn{color:var(--n-amber);border-color:color-mix(in srgb,var(--n-amber) 40%,transparent)}.pill.warn .d{background:var(--n-amber);box-shadow:0 0 8px var(--n-amber)}
.pill.err{color:var(--n-red);border-color:color-mix(in srgb,var(--n-red) 40%,transparent)}.pill.err .d{background:var(--n-red);box-shadow:0 0 8px var(--n-red)}

/* ── Code symbol decorations ─────────────────────────────── */
.bracket{font-family:var(--mono);color:var(--ink-4)}
.glyph-fade{color:var(--ink-4);font-family:var(--mono)}

@keyframes pulse{0%{box-shadow:0 0 0 0 color-mix(in srgb, var(--n-lime) 55%, transparent)}80%{box-shadow:0 0 0 8px transparent}100%{box-shadow:0 0 0 0 transparent}}
@keyframes blink{50%{opacity:.25}}
.cursor{display:inline-block;width:.55em;height:1em;background:var(--p);vertical-align:-2px;margin-left:2px;animation:blink 1.05s steps(2) infinite}

/* ── Reduced motion ──────────────────────────────────────── */
@media (prefers-reduced-motion: reduce){
  *{animation-duration:.001s !important;transition-duration:.001s !important}
}

/* ── Mobile ──────────────────────────────────────────────── */
@media (max-width:980px){
  footer.foot{grid-template-columns:1fr 1fr;gap:32px}
}
@media (max-width:780px){
  nav.nav .links a:not(.theme-wrap):not([data-p="contact"]){display:none}
  footer.foot{grid-template-columns:1fr 1fr;gap:24px}
}

/* ── Cite-this popover (global, used by every blog post) ───────────────── */
#cite-popover{
  z-index: 1000;
  width: min(420px, calc(100vw - 24px));
  background: var(--bg-1);
  color: var(--ink);
  border: 1px solid var(--line-2);
  border-radius: 12px;
  box-shadow: 0 24px 60px -20px rgba(0,0,0,0.6), 0 0 0 1px rgba(255,255,255,0.04);
  font-family: var(--sans);
  padding: 10px 12px 14px;
  animation: cite-pop-in .18s ease-out;
}
@keyframes cite-pop-in{
  from { opacity: 0; transform: translateY(-4px) }
  to   { opacity: 1; transform: translateY(0) }
}
#cite-popover .cite-popover-head{
  display: flex; align-items: center; justify-content: space-between;
  font-family: var(--mono); font-size: 10.5px; letter-spacing: .12em;
  color: var(--ink-3); padding: 4px 4px 8px; border-bottom: 1px solid var(--line);
}
#cite-popover .cite-popover-head b{ color: var(--p); font-weight: 500 }
#cite-popover .cite-close{
  background: transparent; border: 0; color: var(--ink-2); font-size: 18px;
  line-height: 1; cursor: pointer; padding: 2px 8px; border-radius: 6px;
}
#cite-popover .cite-close:hover{ background: var(--shade); color: var(--ink) }
#cite-popover .cite-row{ margin-top: 10px }
#cite-popover .cite-row-head{
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 4px;
}
#cite-popover .cite-row-label{
  font-family: var(--mono); font-size: 10.5px; letter-spacing: .1em;
  text-transform: uppercase; color: var(--ink-2);
}
#cite-popover .cite-copy{
  font-family: var(--mono); font-size: 10.5px; letter-spacing: .08em;
  text-transform: uppercase; padding: 3px 10px; border-radius: 99px;
  border: 1px solid var(--p); color: var(--p);
  background: color-mix(in srgb, var(--p) 8%, transparent);
  cursor: pointer; transition: background .15s, transform .12s;
}
#cite-popover .cite-copy:hover{ background: color-mix(in srgb, var(--p) 18%, transparent) }
#cite-popover .cite-copy:active{ transform: scale(.96) }
#cite-popover .cite-copy.copied{
  background: var(--p); color: var(--bg);
}
#cite-popover .cite-row-body{
  font-family: var(--mono); font-size: 11.5px; line-height: 1.5;
  color: var(--ink); background: var(--bg);
  border: 1px solid var(--line); border-radius: 8px;
  padding: 8px 10px; margin: 0;
  white-space: pre-wrap; word-break: break-word; overflow-wrap: anywhere;
  max-height: 160px; overflow-y: auto;
}
.cite-this .pill{ user-select: none }
.cite-this .pill:hover{
  background: color-mix(in srgb, var(--p) 18%, transparent);
  cursor: pointer;
}
.cite-this .pill:focus-visible{
  outline: 2px solid var(--p); outline-offset: 2px;
}