/* Observ, observ.si landing. Static. No framework. */

/* Self-hosted variable fonts. SIL Open Font License 1.1, text in fonts/.
   No third-party font CDN, so no visitor IP is sent to Google. */
@font-face {
  font-family: 'Inter';
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
  src: url('fonts/inter-latin-wght-normal.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: 'JetBrains Mono';
  font-style: normal;
  font-weight: 100 800;
  font-display: swap;
  src: url('fonts/jetbrains-mono-latin-wght-normal.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

:root {
  --paper: #FBFBF8;
  --paper-2: #F3F3EE;
  --ink: #0B0B0C;
  --ink-72: rgba(11, 11, 12, .72);
  --ink-55: rgba(11, 11, 12, .55);
  --ink-40: rgba(11, 11, 12, .40);
  --line: rgba(11, 11, 12, .14);
  --line-2: rgba(11, 11, 12, .26);
  --line-strong: rgba(11, 11, 12, .82);

  --accent: #FF4A1C;
  --accent-hover: #E63F14;
  --accent-ink: #170500;

  --dark: #0B0C0D;
  --on-dark: #F2F2ED;
  --on-dark-60: rgba(242, 242, 237, .62);
  --on-dark-40: rgba(242, 242, 237, .40);
  --on-dark-line: rgba(242, 242, 237, .15);
  --on-dark-line-2: rgba(242, 242, 237, .30);

  --nav-h: 68px;
  --ease: cubic-bezier(.16, 1, .3, 1);
  --sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
img, svg, canvas { display: block; max-width: 100%; }
a { color: inherit; }
h1, h2, h3, h4, p { margin: 0; }
ul { margin: 0; padding: 0; list-style: none; }
button { font: inherit; }
::selection { background: var(--accent); color: var(--accent-ink); }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }

.wrap { width: 100%; max-width: 1200px; margin-inline: auto; padding-inline: clamp(20px, 5vw, 64px); }

.skip {
  position: absolute; left: -9999px; top: 0; z-index: 100;
  background: var(--ink); color: var(--paper); padding: 10px 14px;
  font: 500 12px/1 var(--mono);
}
.skip:focus { left: 8px; top: 8px; }

/* ---------- micro type ---------- */
.lbl { font: 500 11px/1 var(--mono); letter-spacing: .16em; text-transform: uppercase; }
.chip {
  display: inline-flex; align-items: center; gap: .55em;
  font: 500 11px/1 var(--mono); letter-spacing: .15em; text-transform: uppercase;
  color: var(--ink-72); border: 1px solid var(--line-2); padding: 9px 12px;
}
.chip__dot { width: 6px; height: 6px; background: var(--accent); flex: none; }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: .7em;
  font: 600 12px/1 var(--mono); letter-spacing: .1em; text-transform: uppercase;
  text-decoration: none; color: var(--accent-ink); background: var(--accent);
  border: 1px solid var(--accent); padding: 16px 22px; cursor: pointer;
  transition: background .18s var(--ease), border-color .18s var(--ease), transform .18s var(--ease);
}
.btn:hover { background: var(--accent-hover); border-color: var(--accent-hover); transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn__arrow { transition: transform .18s var(--ease); }
.btn:hover .btn__arrow { transform: translateX(3px); }
.btn--sm { padding: 11px 14px; font-size: 11px; }

.link {
  display: inline-block; font: 500 12px/1 var(--mono); letter-spacing: .1em; text-transform: uppercase;
  text-decoration: none; color: var(--ink); border-bottom: 1px solid var(--line-strong);
  padding-bottom: 3px; transition: color .18s, border-color .18s;
}
.link:hover { color: var(--accent); border-color: var(--accent); }

/* ---------- nav ---------- */
.nav {
  position: fixed; inset: 0 0 auto 0; z-index: 50; height: var(--nav-h);
  background: rgba(251, 251, 248, .86);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav__inner { height: 100%; display: flex; align-items: center; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; font: 600 15px/1 var(--mono); letter-spacing: .01em; }
.brand__logo { height: 28px; width: auto; }
.nav__links { display: flex; gap: 28px; margin-left: auto; }
.nav__links a {
  font: 500 11px/1 var(--mono); letter-spacing: .14em; text-transform: uppercase;
  text-decoration: none; color: var(--ink-55); transition: color .15s;
}
.nav__links a:hover { color: var(--ink); }
.nav__bar { position: absolute; left: 0; bottom: -1px; height: 2px; width: 0; background: var(--accent); }

/* ---------- hero ---------- */
.hero { position: relative; padding-top: calc(var(--nav-h) + clamp(40px, 7vw, 92px)); padding-bottom: clamp(60px, 8vw, 112px); }
.hero__grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: clamp(32px, 5vw, 72px); align-items: center; }
.hero__content { max-width: 650px; }
.hero h1 { margin-top: 26px; font: 700 clamp(40px, 5.6vw, 74px)/1.02 var(--sans); letter-spacing: -.042em; }
.hero h1 em { font-style: normal; color: var(--accent); }
.hero__sub { margin-top: 24px; font-size: clamp(16px, 1.5vw, 19px); line-height: 1.55; color: var(--ink-72); max-width: 52ch; }
.hero__actions { display: flex; align-items: center; gap: 26px; flex-wrap: wrap; margin-top: 36px; }
.hero__facts { display: flex; flex-wrap: wrap; gap: 10px 26px; margin-top: 46px; padding-top: 22px; border-top: 1px solid var(--line); }
.hero__facts span { font: 500 11px/1 var(--mono); letter-spacing: .13em; text-transform: uppercase; color: var(--ink-55); }

/* hero schematic panel */
.panel { position: relative; width: 100%; aspect-ratio: 4 / 5; max-height: 640px; border: 1px solid var(--line-2); }
.panel .dither { position: absolute; inset: 0; width: 100%; height: 100%; image-rendering: pixelated; }
.panel__reticle {
  position: absolute; top: 50%; left: 52%; width: min(78%, 380px);
  transform: translate(-50%, -50%); color: var(--ink); opacity: .55; z-index: 2;
}
.panel__scan {
  position: absolute; left: 0; right: 0; height: 1px; z-index: 2;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: .85; animation: scan 6s var(--ease) infinite;
}
@keyframes scan { 0% { top: 9%; } 50% { top: 88%; } 100% { top: 9%; } }
.panel__tag {
  position: absolute; z-index: 3; font: 500 10px/1 var(--mono); letter-spacing: .13em;
  text-transform: uppercase; background: var(--paper); border: 1px solid var(--line-2);
  padding: 7px 9px; color: var(--ink); display: inline-flex; align-items: center; gap: 8px;
}
.panel__tag b { color: var(--accent); font-weight: 600; }
.panel__tag .status { color: var(--ink-55); }
.panel__tag .status::after {
  content: ""; display: inline-block; width: 6px; height: 10px; margin-left: 4px;
  vertical-align: -1px; background: var(--accent); animation: blink 1s steps(1) infinite;
}
@keyframes blink { 50% { opacity: 0; } }
.panel__corner { position: absolute; width: 10px; height: 10px; background: var(--ink); z-index: 3; }
.panel__corner.tl { top: -1px; left: -1px; }
.panel__corner.tr { top: -1px; right: -1px; }
.panel__corner.bl { bottom: -1px; left: -1px; }
.panel__corner.br { bottom: -1px; right: -1px; }

/* ---------- sections ---------- */
.section { padding-block: clamp(72px, 9vw, 124px); border-top: 1px solid var(--line); scroll-margin-top: calc(var(--nav-h) + 16px); }
.section--dark { background: var(--dark); color: var(--on-dark); border-top-color: var(--on-dark-line); }
.section--evidence { background: var(--paper-2); }

.sec-head { max-width: 860px; }
.sec-head h2 { margin-top: 22px; font: 700 clamp(30px, 4.4vw, 54px)/1.04 var(--sans); letter-spacing: -.038em; }
.sec-head p { margin-top: 22px; font-size: clamp(16px, 1.5vw, 18px); line-height: 1.6; color: var(--ink-72); max-width: 62ch; }
.section--dark .chip { color: var(--on-dark-60); border-color: var(--on-dark-line-2); }
.section--dark .sec-head p { color: var(--on-dark-60); }
.section--dark .link { color: var(--on-dark); border-color: var(--on-dark-line-2); }
.section--dark .link:hover { color: var(--accent); border-color: var(--accent); }

/* offer cards */
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line-2); margin-top: clamp(36px, 5vw, 56px); }
.card { background: var(--paper); padding: clamp(22px, 2.8vw, 36px); }
.card__num {
  display: inline-flex; align-items: center; justify-content: center; width: 34px; height: 34px;
  font: 600 12px/1 var(--mono); background: var(--accent); color: var(--accent-ink);
}
.card h3 { margin-top: 22px; font: 600 clamp(18px, 1.9vw, 21px)/1.3 var(--sans); letter-spacing: -.015em; }
.card p { margin-top: 14px; font-size: 15px; line-height: 1.62; color: var(--ink-72); }

/* price band */
.price {
  border: 1px solid var(--line-2); border-top: 0; display: grid; grid-template-columns: 1fr auto;
  gap: 28px; align-items: center; padding: clamp(24px, 3vw, 38px);
}
.price__amount { font: 700 clamp(38px, 5vw, 58px)/1 var(--sans); letter-spacing: -.04em; }
.price__amount small { display: block; margin-top: 12px; font: 500 12px/1.5 var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--ink-55); }
.price__note { margin-top: 16px; font: 500 12px/1.5 var(--mono); letter-spacing: .06em; text-transform: uppercase; color: var(--ink-40); }

/* run pipeline */
.pipe { display: grid; grid-template-columns: repeat(6, 1fr); gap: 1px; background: var(--on-dark-line); border: 1px solid var(--on-dark-line); margin-top: clamp(36px, 5vw, 56px); }
.pipe__step { background: var(--dark); padding: 24px 20px 30px; }
.pipe__num { font: 500 11px/1 var(--mono); letter-spacing: .14em; color: var(--accent); }
.pipe__step h3 { margin-top: 16px; font: 600 15px/1.3 var(--sans); }
.pipe__step p { margin-top: 10px; font-size: 13.5px; line-height: 1.55; color: var(--on-dark-60); }

/* isolation figure */
.iso { margin-top: 26px; border: 1px solid var(--on-dark-line); display: grid; grid-template-columns: 1fr 132px 1fr; }
.iso__node { padding: 24px; }
.iso__node .lbl { color: var(--on-dark-40); }
.iso__node strong { display: block; margin-top: 12px; font: 600 18px/1.3 var(--sans); }
.iso__node span { display: block; margin-top: 8px; font-size: 13.5px; color: var(--on-dark-60); }
.iso__link { display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 10px; border-inline: 1px solid var(--on-dark-line); color: var(--accent); }
.iso__link code { font: 500 11px/1 var(--mono); letter-spacing: .1em; }
.iso__link .arrow { font-size: 16px; }
.iso__cap { margin-top: 16px; font: 500 12px/1.5 var(--mono); letter-spacing: .04em; color: var(--on-dark-40); }

/* scope gate */
.scope-grid { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(28px, 4vw, 64px); margin-top: clamp(36px, 5vw, 56px); }
.scope-list h3 { font: 600 13px/1 var(--mono); letter-spacing: .14em; text-transform: uppercase; color: var(--ink-55); padding-bottom: 16px; border-bottom: 1px solid var(--line-2); }
.scope-list ul { margin-top: 8px; }
.scope-list li { display: flex; gap: 14px; padding: 16px 0; border-bottom: 1px solid var(--line); font-size: 15.5px; line-height: 1.5; }
.scope-list li::before { content: ""; flex: none; width: 7px; height: 7px; margin-top: 7px; background: var(--ink); }
.scope-list--no li::before { background: var(--accent); }

/* finding card */
.finding { border: 1px solid var(--line-2); background: var(--paper); margin-top: clamp(36px, 5vw, 56px); }
.finding__head { display: flex; align-items: center; justify-content: space-between; padding: 14px 20px; border-bottom: 1px solid var(--line); }
.finding__id { font: 500 12px/1 var(--mono); letter-spacing: .14em; color: var(--ink-55); }
.sev { font: 600 11px/1 var(--mono); letter-spacing: .14em; background: var(--accent); color: var(--accent-ink); padding: 7px 10px; }
.finding__title { padding: clamp(20px, 2.6vw, 30px) 20px; font: 600 clamp(19px, 2.2vw, 26px)/1.25 var(--sans); letter-spacing: -.02em; }
.finding__grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1px; background: var(--line); border-top: 1px solid var(--line); }
.finding__cell { background: var(--paper); padding: 18px 20px; }
.finding__cell .lbl { color: var(--ink-40); }
.finding__cell p { margin-top: 10px; font-size: 14.5px; line-height: 1.55; color: var(--ink-72); }

/* close */
.section--close { position: relative; overflow: hidden; padding-block: clamp(90px, 12vw, 168px); }
.close__dither {
  position: absolute; inset: 0; width: 100%; height: 100%; image-rendering: pixelated; opacity: .55;
  -webkit-mask-image: radial-gradient(120% 90% at 78% 42%, #000 0%, transparent 62%);
  mask-image: radial-gradient(120% 90% at 78% 42%, #000 0%, transparent 62%);
}
.close__inner { position: relative; z-index: 2; text-align: center; max-width: 740px; margin-inline: auto; }
.close h2 { font: 700 clamp(34px, 5.4vw, 64px)/1.03 var(--sans); letter-spacing: -.04em; }
.close p { margin: 22px auto 0; font-size: clamp(16px, 1.6vw, 19px); line-height: 1.7; color: var(--on-dark-60); max-width: 60ch; }
.close .btn { margin-top: 34px; }
.close__note { margin-top: 20px; font: 500 12px/1.7 var(--mono); letter-spacing: .14em; text-transform: uppercase; color: var(--on-dark-40); }

/* footer */
.footer { background: var(--dark); color: var(--on-dark); border-top: 1px solid var(--on-dark-line-2); padding-block: clamp(48px, 6vw, 76px); }
.footer__grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr; gap: clamp(28px, 4vw, 60px); }
.footer__brand { display: inline-flex; align-items: center; gap: 10px; font: 600 15px/1 var(--mono); }
.footer__logo { height: 30px; width: auto; }
.footer__tag { margin-top: 16px; font-size: 14px; color: var(--on-dark-60); max-width: 32ch; }
.footer h4 { margin: 0 0 16px; font: 500 11px/1 var(--mono); letter-spacing: .14em; text-transform: uppercase; color: var(--on-dark-40); }
.footer li { margin-bottom: 12px; }
.footer a { font-size: 14px; text-decoration: none; color: var(--on-dark); border-bottom: 1px solid transparent; transition: color .15s, border-color .15s; }
.footer a:hover { color: var(--accent); border-color: var(--accent); }
.footer__bottom {
  display: flex; justify-content: space-between; gap: 20px; flex-wrap: wrap;
  margin-top: clamp(40px, 5vw, 64px); padding-top: 24px; border-top: 1px solid var(--on-dark-line);
  font: 500 12px/1.5 var(--mono); letter-spacing: .04em; color: var(--on-dark-40);
}

/* ---------- legal page ---------- */
.legal { max-width: 780px; }
.legal h1 { margin-top: 26px; font: 700 clamp(34px, 5vw, 56px)/1.04 var(--sans); letter-spacing: -.04em; }
.legal__meta { margin-top: 18px; font: 500 12px/1.6 var(--mono); letter-spacing: .06em; text-transform: uppercase; color: var(--ink-55); }
.legal h2 { margin-top: 52px; padding-top: 26px; border-top: 1px solid var(--line); font: 600 clamp(18px, 2.2vw, 24px)/1.25 var(--sans); letter-spacing: -.02em; }
.legal h3 { margin-top: 26px; font: 600 15px/1.3 var(--sans); }
.legal p { margin-top: 14px; font-size: 15.5px; line-height: 1.7; color: var(--ink-72); }
.legal ul { margin-top: 14px; }
.legal li { position: relative; margin-top: 10px; padding-left: 20px; font-size: 15.5px; line-height: 1.65; color: var(--ink-72); }
.legal li::before { content: ""; position: absolute; left: 0; top: .62em; width: 6px; height: 6px; background: var(--accent); }
.legal a { color: var(--ink); text-decoration: underline; text-decoration-color: var(--line-2); text-underline-offset: 3px; transition: color .15s, text-decoration-color .15s; }
.legal a:hover { color: var(--accent); text-decoration-color: var(--accent); }
.legal code { font: 500 13px/1.5 var(--mono); background: var(--paper-2); border: 1px solid var(--line); padding: 2px 6px; }

/* ---------- reveal ---------- */
.js [data-reveal] {
  opacity: 0; transform: translateY(20px);
  transition: opacity .7s var(--ease), transform .7s var(--ease);
  transition-delay: calc(var(--i, 0) * 70ms);
}
.js [data-reveal].in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .js [data-reveal] { opacity: 1; transform: none; transition: none; }
  .panel__scan { display: none; }
  .panel__tag .status::after { display: none; }
  .btn, .link { transition: none; }
}

/* ---------- responsive ---------- */
@media (max-width: 980px) {
  .hero__grid { grid-template-columns: 1fr; gap: 44px; }
  .panel { max-height: 520px; aspect-ratio: 5 / 4; }
  .pipe { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 820px) {
  .cards { grid-template-columns: 1fr; }
  .price { grid-template-columns: 1fr; }
  .footer__grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 880px) {
  .nav__links { display: none; }
  .nav__inner { justify-content: space-between; }
  .brand { margin-right: auto; }
}
@media (max-width: 720px) {
  .scope-grid { grid-template-columns: 1fr; gap: 36px; }
  .iso { grid-template-columns: 1fr; }
  .iso__link { flex-direction: row; border-inline: 0; border-block: 1px solid var(--on-dark-line); padding: 16px; }
}
@media (max-width: 560px) {
  .pipe { grid-template-columns: 1fr 1fr; }
  .finding__grid { grid-template-columns: 1fr; }
  .footer__grid { grid-template-columns: 1fr; }
  .hero__actions { gap: 18px; }
}
@media (max-width: 420px) {
  .pipe { grid-template-columns: 1fr; }
}