/* ============================================================
   Zarpix Labs: styles.css
   Mixed light/dark editorial system
   ============================================================ */

:root {
  --ink: #15151a;
  --ink-soft: #2a2a32;
  --ink-muted: #5c5c66;
  --paper: #f7f6f2;
  --paper-raised: #ffffff;
  --line: rgba(21, 21, 26, 0.12);
  --line-strong: rgba(21, 21, 26, 0.24);
  --accent: #3d3bf3;
  --accent-soft: rgba(61, 59, 243, 0.08);
  --accent-on-dark: #8886ff;

  --d-bg: #101014;
  --d-bg-raised: #17171d;
  --d-text: #f2f1ec;
  --d-muted: #8f8f9b;
  --d-line: rgba(242, 241, 236, 0.12);

  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-serif: "Instrument Serif", Georgia, serif;

  --max-w: 1200px;
  --pad-x: clamp(1.25rem, 4vw, 3rem);
  --section-y: clamp(4.5rem, 10vw, 8.5rem);

  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  background: var(--paper);
  color: var(--ink);
  line-height: 1.6;
  font-size: 1rem;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; border: none; background: none; }
::selection { background: var(--accent); color: #fff; }
a:focus-visible, button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}
.dark a:focus-visible, .dark button:focus-visible,
.nav.on-dark a:focus-visible, .nav.on-dark button:focus-visible {
  outline-color: var(--accent-on-dark);
}

/* ---------- Type scale ---------- */
h1, h2, h3 { font-weight: 600; letter-spacing: -0.035em; line-height: 1.05; }
.display {
  font-size: clamp(2.75rem, 7vw, 5.25rem);
  letter-spacing: -0.045em;
}
.display .serif,
h2 .serif {
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 400;
  letter-spacing: -0.01em;
}
h2.section-title { font-size: clamp(2rem, 4.5vw, 3.25rem); }
.eyebrow {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-muted);
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.eyebrow::before {
  content: "";
  width: 2rem;
  height: 1px;
  background: currentColor;
  opacity: 0.5;
}
.dark .eyebrow { color: var(--d-muted); }
.lede {
  font-size: clamp(1.05rem, 1.6vw, 1.25rem);
  color: var(--ink-muted);
  max-width: 34em;
}
.dark .lede { color: var(--d-muted); }

/* ---------- Layout ---------- */
.container { max-width: var(--max-w); margin: 0 auto; padding-inline: var(--pad-x); }
section { padding-block: var(--section-y); }
.section-head { display: grid; gap: 1.25rem; margin-bottom: clamp(2.5rem, 6vw, 4.5rem); max-width: 46em; }
.dark { background: var(--d-bg); color: var(--d-text); }

/* ---------- Nav ---------- */
.nav {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  transition: background 0.35s var(--ease), box-shadow 0.35s var(--ease);
}
.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 1.1rem var(--pad-x);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.nav.scrolled {
  background: rgba(247, 246, 242, 0.85);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: 0 1px 0 var(--line);
}
.nav.on-dark { color: var(--d-text); }
.nav.on-dark.scrolled {
  background: rgba(16, 16, 20, 0.8);
  box-shadow: 0 1px 0 var(--d-line);
}
.brand { display: flex; align-items: center; }
/* Single-file lockup: tile + wordmark share one viewBox so they always scale together */
.brand .lockup { height: 3.1rem; width: auto; display: block; }
.lockup-tile { fill: var(--ink); }
.lockup-z { stroke: #ffffff; }
.lockup-name {
  font-family: var(--font-sans);
  font-size: 54px;
  font-weight: 700;
  letter-spacing: -1px;
  fill: var(--ink);
}
.lockup-sub {
  font-family: var(--font-sans);
  font-size: 21px;
  font-weight: 500;
  letter-spacing: 13px;
  fill: var(--ink);
  opacity: 0.55;
}
.nav.on-dark .lockup-tile { fill: #ffffff; }
.nav.on-dark .lockup-z { stroke: var(--ink); }
.nav.on-dark .lockup-name, .nav.on-dark .lockup-sub { fill: var(--d-text); }
/* Nav CTA keeps contrast against whichever glass it sits on */
.nav:not(.on-dark) .btn-light { background: var(--ink); color: var(--paper); }
.nav:not(.on-dark) .btn-light:hover { background: var(--accent); color: #fff; }
.nav-links.open .btn-solid,
.nav.nav .nav-links.open .btn-light { background: var(--d-text); color: var(--ink); }
.nav-links.open .btn-solid:hover,
.nav.nav .nav-links.open .btn-light:hover { background: var(--accent); color: #fff; }
.nav-links { display: flex; align-items: center; gap: 2rem; list-style: none; }
.nav-links a {
  font-size: 0.9rem;
  font-weight: 500;
  opacity: 0.75;
  transition: opacity 0.2s;
  position: relative;
}
.nav-links a:hover, .nav-links a[aria-current="page"] { opacity: 1; }
.nav-links a[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -6px;
  height: 2px;
  background: var(--accent);
}
.nav.on-dark .nav-links a[aria-current="page"]::after { background: var(--accent-on-dark); }
.nav-cta { margin-left: 0.5rem; }

/* Mobile nav */
.nav-toggle { display: none; flex-direction: column; gap: 5px; padding: 6px; position: relative; z-index: 5; }
.nav-toggle span { width: 22px; height: 2px; background: currentColor; transition: transform 0.3s var(--ease), opacity 0.3s; }
.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: 820px) {
  .js .nav-toggle { display: flex; }
  .js .nav-links {
    position: fixed;
    inset: 0;
    background: var(--ink);
    color: var(--d-text);
    flex-direction: column;
    justify-content: center;
    gap: 2.25rem;
    font-size: 1.5rem;
    transform: translateY(-100%);
    visibility: hidden;
    transition: transform 0.45s var(--ease), visibility 0s 0.45s;
  }
  .nav-links.open { transform: translateY(0); visibility: visible; transition: transform 0.45s var(--ease); }
  .js .nav-links a { font-size: 1.4rem; }
  .nav.menu-open { color: var(--d-text); }
  /* No-JS fallback: keep links usable in a compact row */
  html:not(.js) .nav-links { gap: 1rem; }
  html:not(.js) .nav-links a { font-size: 0.85rem; }
  html:not(.js) .nav-cta { display: none; }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 0.85rem 1.6rem;
  border-radius: 999px;
  font-size: 0.92rem;
  font-weight: 550;
  letter-spacing: -0.01em;
  transition: transform 0.25s var(--ease), background 0.25s, color 0.25s, border-color 0.25s;
}
.btn:hover { transform: translateY(-2px); }
.btn .arrow { transition: transform 0.25s var(--ease); }
.btn:hover .arrow { transform: translateX(3px); }
.btn-solid { background: var(--ink); color: var(--paper); }
.btn-solid:hover { background: var(--accent); color: #fff; }
.dark .btn-solid, .btn-light { background: var(--d-text); color: var(--ink); }
.dark .btn-solid:hover, .btn-light:hover { background: var(--accent); color: #fff; }
.btn-sm { padding: 0.55rem 1.15rem; font-size: 0.85rem; }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding-top: clamp(8rem, 18vh, 11rem);
  padding-bottom: clamp(4rem, 9vw, 7rem);
  overflow: hidden;
}
.hero.dark { background: radial-gradient(120% 90% at 70% 0%, #1b1b23 0%, var(--d-bg) 55%); }
.hero .container { position: relative; display: grid; gap: 2rem; }
.hero .display { max-width: 12em; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 1rem; margin-top: 0.5rem; }
.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 2.5rem;
  margin-top: clamp(2rem, 5vw, 3.5rem);
  padding-top: 2rem;
  border-top: 1px solid var(--d-line);
}
.hero-meta div strong { display: block; font-size: 1.35rem; font-weight: 600; letter-spacing: -0.03em; }
.hero-meta div span { font-size: 0.82rem; color: var(--d-muted); }

/* Page hero (light, inner pages) */
.page-hero { padding-top: clamp(8rem, 16vh, 10.5rem); padding-bottom: clamp(3rem, 6vw, 5rem); border-bottom: 1px solid var(--line); }
.page-hero .container { display: grid; gap: 1.5rem; }

/* ---------- Marquee ---------- */
.marquee {
  border-block: 1px solid var(--line);
  padding-block: 1.1rem;
  overflow: hidden;
  white-space: nowrap;
  background: var(--paper-raised);
}
.marquee-track { display: inline-flex; gap: 3.5rem; animation: marquee 36s linear infinite; will-change: transform; }
.marquee span {
  font-size: 0.85rem;
  font-weight: 550;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-muted);
  display: inline-flex;
  align-items: center;
  gap: 3.5rem;
}
.marquee span::after { content: "◆"; font-size: 0.5rem; color: var(--accent); }
@keyframes marquee { to { transform: translateX(-50%); } }
@media (prefers-reduced-motion: reduce) {
  .marquee-track { animation: none; }
  html { scroll-behavior: auto; }
}

/* ---------- Numbered cards / services ---------- */
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); }
.card {
  background: var(--paper);
  padding: clamp(1.75rem, 3vw, 2.5rem);
  display: grid;
  gap: 1rem;
  align-content: start;
  transition: background 0.3s var(--ease);
  position: relative;
}
.card:hover { background: var(--paper-raised); }
.card .num {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 1.05rem;
  color: var(--accent);
}
.card h3 { font-size: 1.35rem; }
.card p { color: var(--ink-muted); font-size: 0.95rem; }
.card ul { list-style: none; display: grid; gap: 0.5rem; padding-top: 0.25rem; }
.card ul li {
  font-size: 0.88rem;
  color: var(--ink-soft);
  padding-left: 1.1rem;
  position: relative;
}
.card ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 5px; height: 5px;
  background: var(--accent);
}
.card .card-link { font-size: 0.88rem; font-weight: 550; color: var(--accent); display: inline-flex; gap: 0.4rem; align-items: center; margin-top: 0.25rem; }
@media (max-width: 900px) { .cards { grid-template-columns: 1fr; } }

/* ---------- Approach (dark, numbered steps) ---------- */
.steps { display: grid; gap: 0; border-top: 1px solid var(--d-line); counter-reset: step; }
.step {
  display: grid;
  grid-template-columns: 5rem 1fr 1.4fr;
  gap: 2rem;
  padding: clamp(1.75rem, 3.5vw, 2.5rem) 0;
  border-bottom: 1px solid var(--d-line);
  align-items: baseline;
}
.step .step-num { font-family: var(--font-serif); font-style: italic; font-size: 1.4rem; color: var(--d-muted); }
.step h3 { font-size: clamp(1.35rem, 2.4vw, 1.85rem); }
.step p { color: var(--d-muted); font-size: 0.98rem; max-width: 34em; }
@media (max-width: 760px) {
  .step { grid-template-columns: 3rem 1fr; }
  .step p { grid-column: 2; }
}

/* ---------- Principles ---------- */
.principles { display: grid; grid-template-columns: repeat(2, 1fr); gap: clamp(2rem, 4vw, 3.5rem) clamp(2.5rem, 5vw, 5rem); }
.principle { display: grid; gap: 0.6rem; }
.principle h3 { font-size: 1.15rem; display: flex; align-items: center; gap: 0.7rem; }
.principle h3::before { content: ""; width: 0.55rem; height: 0.55rem; background: var(--accent); flex-shrink: 0; }
.principle p { color: var(--ink-muted); font-size: 0.95rem; }
@media (max-width: 760px) { .principles { grid-template-columns: 1fr; } }

/* ---------- Service detail (services page) ---------- */
.service-block {
  display: grid;
  grid-template-columns: 1fr 1.35fr;
  gap: clamp(2rem, 5vw, 5rem);
  padding-block: clamp(3rem, 6vw, 5rem);
  border-bottom: 1px solid var(--line);
  scroll-margin-top: 6rem;
}
.service-block:last-of-type { border-bottom: none; }
.service-block .left { position: sticky; top: 7rem; align-self: start; display: grid; gap: 1rem; }
.service-block .num-big {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: clamp(2.5rem, 5vw, 3.5rem);
  color: var(--accent);
  line-height: 1;
}
.service-block h2 { font-size: clamp(1.75rem, 3.5vw, 2.6rem); }
.service-block .right { display: grid; gap: 1.5rem; align-content: start; }
.service-block .right > p { color: var(--ink-muted); font-size: 1.02rem; max-width: 38em; }
.deliverables { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); margin-top: 0.5rem; }
.deliverables div { background: var(--paper); padding: 1.25rem 1.4rem; }
.deliverables strong { display: block; font-size: 0.95rem; font-weight: 600; letter-spacing: -0.01em; margin-bottom: 0.25rem; }
.deliverables span { font-size: 0.85rem; color: var(--ink-muted); }
@media (max-width: 860px) {
  .service-block { grid-template-columns: 1fr; }
  .service-block .left { position: static; }
  .deliverables { grid-template-columns: 1fr; }
}

/* ---------- Engagement models ---------- */
.models { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.25rem; }
.model {
  border: 1px solid var(--d-line);
  padding: clamp(1.5rem, 2.5vw, 2.25rem);
  display: grid;
  gap: 0.9rem;
  align-content: start;
  background: var(--d-bg-raised);
  transition: border-color 0.3s;
}
.model:hover { border-color: rgba(242, 241, 236, 0.35); }
.model .tag { font-size: 0.72rem; font-weight: 600; letter-spacing: 0.14em; text-transform: uppercase; color: var(--accent-on-dark); }
.model h3 { font-size: 1.3rem; }
.model p { color: var(--d-muted); font-size: 0.92rem; }
.model .duration { font-family: var(--font-serif); font-style: italic; font-size: 1rem; color: var(--d-text); opacity: 0.8; }
@media (max-width: 860px) { .models { grid-template-columns: 1fr; } }

/* ---------- CTA band ---------- */
.cta-band { text-align: left; }
.cta-band .container { display: grid; gap: 1.75rem; justify-items: start; }
.cta-band h2 { font-size: clamp(2.25rem, 5.5vw, 4rem); letter-spacing: -0.04em; max-width: 14em; }

/* ---------- Contact page ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.15fr;
  gap: clamp(2.5rem, 6vw, 6rem);
  align-items: start;
}
.contact-info { display: grid; gap: 2rem; }
.contact-info .email-big {
  font-size: clamp(1.3rem, 2.6vw, 1.9rem);
  font-weight: 600;
  letter-spacing: -0.03em;
  text-decoration: underline;
  text-decoration-color: var(--accent);
  text-decoration-thickness: 2px;
  text-underline-offset: 6px;
  transition: color 0.2s;
  overflow-wrap: anywhere;
}
.contact-info .email-big:hover { color: var(--accent); }
.contact-facts { display: grid; gap: 1.25rem; border-top: 1px solid var(--line); padding-top: 1.75rem; }
.contact-facts div strong { display: block; font-size: 0.78rem; font-weight: 600; letter-spacing: 0.14em; text-transform: uppercase; color: var(--ink-muted); margin-bottom: 0.2rem; }
.contact-facts div span { font-size: 0.98rem; }
@media (max-width: 860px) { .contact-grid { grid-template-columns: 1fr; } }

/* Form */
.form { display: grid; gap: 1.4rem; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1.4rem; }
@media (max-width: 560px) { .form-row { grid-template-columns: 1fr; } }
.field { display: grid; gap: 0.45rem; }
.field label { font-size: 0.82rem; font-weight: 600; letter-spacing: 0.02em; }
.field input, .field select, .field textarea {
  font: inherit;
  font-size: 0.95rem;
  padding: 0.8rem 1rem;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  background: var(--paper-raised);
  color: var(--ink);
  transition: border-color 0.2s, box-shadow 0.2s;
  width: 100%;
}
.field select {
  appearance: none;
  -webkit-appearance: none;
  padding-right: 2.75rem;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1.5 6 6.5 11 1.5' fill='none' stroke='%2315151a' stroke-width='1.8' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1.1rem center;
}
.field textarea { resize: vertical; min-height: 8.5rem; }
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.form-note { font-size: 0.82rem; color: var(--ink-muted); }
.form .btn { justify-self: start; }
html:not(.js) .form { display: none; }

/* FAQ */
.faq { display: grid; max-width: 46rem; border-top: 1px solid var(--line); }
.faq-item { border-bottom: 1px solid var(--line); }
.faq-item summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 1.35rem 0;
  font-weight: 600;
  letter-spacing: -0.01em;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "+";
  font-family: var(--font-serif);
  font-size: 1.4rem;
  line-height: 1;
  color: var(--accent);
  transition: transform 0.25s var(--ease);
  flex-shrink: 0;
}
.faq-item[open] summary::after { transform: rotate(45deg); }
.faq-item p { padding-bottom: 1.35rem; color: var(--ink-muted); font-size: 0.96rem; max-width: 38em; }
.form-status { font-size: 0.9rem; font-weight: 550; color: var(--accent); min-height: 1.4em; }

/* ---------- Footer ---------- */
.footer { background: var(--d-bg); color: var(--d-text); padding-block: clamp(3.5rem, 7vw, 5.5rem) 2rem; }
.footer-top {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 2.5rem;
  padding-bottom: 3rem;
  border-bottom: 1px solid var(--d-line);
}
.footer-brand { display: grid; gap: 1rem; justify-items: start; align-content: start; }
.footer-brand img { width: 2.75rem; height: 2.75rem; }
.footer-brand p { color: var(--d-muted); font-size: 0.92rem; max-width: 26em; }
.footer h4 { font-size: 0.75rem; font-weight: 600; letter-spacing: 0.16em; text-transform: uppercase; color: var(--d-muted); margin-bottom: 1.1rem; }
.footer ul { list-style: none; display: grid; gap: 0.7rem; }
.footer ul a { font-size: 0.95rem; opacity: 0.85; transition: opacity 0.2s; }
.footer ul a:hover { opacity: 1; }
.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
  padding-top: 1.75rem;
  font-size: 0.82rem;
  color: var(--d-muted);
}
@media (max-width: 760px) { .footer-top { grid-template-columns: 1fr; } }

/* ---------- Reveal on scroll (only hidden when JS is running) ---------- */
.js .reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.7s var(--ease), transform 0.7s var(--ease); }
.js .reveal.visible { opacity: 1; transform: none; }
.reveal:nth-child(2) { transition-delay: 0.08s; }
.reveal:nth-child(3) { transition-delay: 0.16s; }
.reveal:nth-child(4) { transition-delay: 0.24s; }
@media (prefers-reduced-motion: reduce) {
  .js .reveal { opacity: 1; transform: none; transition: none; }
}

/* ---------- Utilities ---------- */
.section-flush { padding-block: 0; }
.section-tight { padding-top: 0; }
.lede-sm { font-size: 1rem; }
.mb-1 { margin-bottom: 1rem; }
.skip-link {
  position: fixed;
  left: -9999px;
  top: 0;
  background: var(--accent);
  color: #fff;
  padding: 0.6rem 1rem;
  z-index: 200;
}
.skip-link:focus { left: 0; }