/* =========================================================
   TrAItFold.AI — "Intelligence, folded in."
   Design system: folded light. Angular facets, crease seams,
   one warm accent held back for the AI inside the wordmark.
   ========================================================= */

/* ---------- tokens ---------- */
:root {
  /* colour */
  --ink:        #070812;
  --ink-2:      #0B0D19;
  --surface:    #10121F;
  --surface-2:  #161930;
  --line:       rgba(160, 168, 214, 0.14);
  --line-soft:  rgba(160, 168, 214, 0.08);

  --iris:       #7C6CFF;
  --iris-dim:   #5B4EE0;
  --cyan:       #4DD9E6;
  --amber:      #FFC46B;

  --paper:      #F2F3FA;
  --muted:      #9AA0BD;
  --muted-2:    #6E7492;

  --grad-fold:  linear-gradient(115deg, var(--iris) 0%, var(--cyan) 100%);

  /* type */
  --font-display: "Space Grotesk", system-ui, sans-serif;
  --font-body:    "Inter", system-ui, -apple-system, sans-serif;
  --font-mono:    "JetBrains Mono", ui-monospace, "SFMono-Regular", monospace;

  --fs-xs:   clamp(0.75rem, 0.72rem + 0.15vw, 0.8125rem);
  --fs-sm:   clamp(0.875rem, 0.85rem + 0.15vw, 0.9375rem);
  --fs-base: clamp(1rem, 0.96rem + 0.2vw, 1.0625rem);
  --fs-lg:   clamp(1.125rem, 1.05rem + 0.4vw, 1.3125rem);
  --fs-xl:   clamp(1.375rem, 1.2rem + 0.8vw, 1.75rem);
  --fs-2xl:  clamp(1.875rem, 1.5rem + 1.8vw, 3rem);
  --fs-3xl:  clamp(2.375rem, 1.75rem + 3vw, 4.25rem);

  /* space */
  --sp-1: 0.5rem;
  --sp-2: 0.875rem;
  --sp-3: 1.25rem;
  --sp-4: 2rem;
  --sp-5: 3rem;
  --sp-6: clamp(3.5rem, 2rem + 6vw, 7rem);

  /* motion */
  --dur:  260ms;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);

  --shell: 1180px;
  --radius: 14px;
}

/* ---------- reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
  font-size: var(--fs-base);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img, svg, canvas { display: block; max-width: 100%; }
h1, h2, h3 { margin: 0; font-family: var(--font-display); line-height: 1.08; font-weight: 700; letter-spacing: -0.02em; }
p  { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
a  { color: inherit; text-decoration: none; }

:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 4px;
}

.skip-link {
  position: absolute; left: -9999px; top: 0; z-index: 100;
  background: var(--iris); color: #fff; padding: 0.75rem 1.25rem; border-radius: 0 0 8px 0;
}
.skip-link:focus { left: 0; }

.shell { width: min(100% - 2.5rem, var(--shell)); margin-inline: auto; }

/* ---------- shared atoms ---------- */
.eyebrow {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
  margin-bottom: var(--sp-3);
}

.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: 0.5rem;
  min-height: 48px;
  padding: 0.8rem 1.6rem;
  border: 1px solid transparent;
  border-radius: 10px;
  font-family: var(--font-body);
  font-size: var(--fs-sm);
  font-weight: 600;
  letter-spacing: 0.01em;
  cursor: pointer;
  transition: transform var(--dur) var(--ease),
              background-color var(--dur) var(--ease),
              border-color var(--dur) var(--ease),
              box-shadow var(--dur) var(--ease);
}
.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }

.btn--primary {
  background: var(--iris);
  color: #fff;
  box-shadow: 0 8px 26px -12px var(--iris);
}
.btn--primary:hover { background: #8B7CFF; box-shadow: 0 14px 34px -12px var(--iris); }

.btn--ghost {
  background: rgba(160, 168, 214, 0.05);
  border-color: var(--line);
  color: var(--paper);
}
.btn--ghost:hover { border-color: rgba(124, 108, 255, 0.55); background: rgba(124, 108, 255, 0.09); }

.btn--sm { min-height: 40px; padding: 0.5rem 1.05rem; }
.btn--block { width: 100%; margin-top: auto; }

/* ---------- wordmark ---------- */
.wordmark { display: inline-flex; align-items: center; gap: 0.6rem; }
.wordmark__mark { display: grid; place-items: center; }
.wordmark__text {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: -0.015em;
}
.wordmark__ai  { color: var(--amber); }
.wordmark__tld { color: var(--muted-2); font-weight: 500; }

/* ---------- header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  border-bottom: 1px solid transparent;
  transition: background-color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.site-header.is-stuck {
  background: rgba(7, 8, 18, 0.82);
  backdrop-filter: blur(14px) saturate(160%);
  border-bottom-color: var(--line-soft);
}
.site-header__inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: var(--sp-3);
  padding-block: 1rem;
}
.site-nav { display: flex; align-items: center; gap: 1.75rem; }
.site-nav a {
  font-size: var(--fs-sm);
  color: var(--muted);
  transition: color var(--dur) var(--ease);
}
.site-nav a:hover { color: var(--paper); }
.site-nav .btn { color: #fff; }

.nav-toggle {
  display: none;
  width: 46px; height: 46px;
  background: none; border: 1px solid var(--line); border-radius: 10px;
  cursor: pointer;
  place-items: center; gap: 5px;
}
.nav-toggle span {
  display: block; width: 18px; height: 1.5px; background: var(--paper);
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}
.nav-toggle[aria-expanded="true"] span:first-child { transform: translateY(3.25px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:last-child  { transform: translateY(-3.25px) rotate(-45deg); }

/* ---------- hero ---------- */
.hero {
  position: relative;
  min-height: min(92vh, 860px);
  display: flex; align-items: center;
  padding-block: var(--sp-6) var(--sp-6);
  overflow: hidden;
}
.hero__canvas { position: absolute; inset: 0; width: 100%; height: 100%; z-index: 0; }
/* Veil keeps text legible but must not smother the fold field behind it:
   it stays open on the right, where the canvas has room to show. */
.hero__veil {
  position: absolute; inset: 0; z-index: 1;
  background:
    radial-gradient(72% 78% at 6% 50%, rgba(7,8,18,0.95) 0%, rgba(7,8,18,0.72) 40%, transparent 76%),
    linear-gradient(180deg, rgba(7,8,18,0.60) 0%, transparent 24%, rgba(7,8,18,0.72) 90%, var(--ink) 100%);
}
.hero__inner { position: relative; z-index: 2; max-width: 60rem; }

.hero__title {
  font-size: var(--fs-3xl);
  max-width: 19ch;
  text-wrap: balance;
  margin-bottom: var(--sp-3);
}
.hero__lede {
  font-size: var(--fs-lg);
  color: var(--muted);
  max-width: 54ch;
  margin-bottom: var(--sp-4);
}
.hero__actions { display: flex; flex-wrap: wrap; gap: 0.85rem; margin-bottom: var(--sp-5); }

.hero__slogan {
  position: relative;
  display: flex; align-items: center; gap: 1rem;
  font-family: var(--font-display);
  font-size: var(--fs-lg);
  font-weight: 500;
  color: var(--paper);
  letter-spacing: -0.01em;
}
.hero__crease {
  display: block; width: 56px; height: 2px; flex: none;
  background: var(--grad-fold);
  box-shadow: 0 0 18px rgba(124, 108, 255, 0.6);
}

/* ---------- capability strip ---------- */
.strip { border-block: 1px solid var(--line-soft); background: var(--ink-2); }
.strip__inner {
  display: grid; gap: var(--sp-3);
  padding-block: var(--sp-4);
  grid-template-columns: minmax(0, 1fr);
}
.strip__lead { font-size: var(--fs-lg); color: var(--paper); max-width: 46ch; }
.strip__tags { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.strip__tags li {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--muted);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.35rem 0.8rem;
}
@media (min-width: 880px) {
  .strip__inner { grid-template-columns: 0.9fr 1.1fr; align-items: center; gap: var(--sp-4); }
}

/* ---------- crease seam ---------- */
.seam {
  height: 1px;
  background: linear-gradient(90deg, transparent 0%, rgba(124,108,255,0.5) 22%, rgba(77,217,230,0.5) 62%, transparent 100%);
  opacity: 0.55;
}
.seam--flip {
  background: linear-gradient(90deg, transparent 0%, rgba(255,196,107,0.45) 30%, rgba(124,108,255,0.5) 74%, transparent 100%);
}

/* ---------- generic section ---------- */
.section { padding-block: var(--sp-6); }
.section--alt { background: var(--ink-2); }

.section__head { max-width: 62ch; margin-bottom: var(--sp-5); }
.section__title { font-size: var(--fs-2xl); margin-bottom: var(--sp-3); }
.section__lede { font-size: var(--fs-lg); color: var(--muted); }

/* ---------- pillars ---------- */
.pillars {
  display: grid; gap: var(--sp-3);
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 300px), 1fr));
}
.pillar {
  position: relative;
  display: flex; flex-direction: column;
  padding: var(--sp-4);
  background: var(--surface);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
/* the fold: a lit crease along the top-left corner */
.pillar::before {
  content: ""; position: absolute; top: 0; left: 0;
  width: 74px; height: 74px;
  background: var(--grad-fold);
  clip-path: polygon(0 0, 100% 0, 0 100%);
  opacity: 0.14;
  transition: opacity var(--dur) var(--ease);
}
.pillar:hover { transform: translateY(-4px); border-color: rgba(124,108,255,0.34); }
.pillar:hover::before { opacity: 0.3; }

.pillar__glyph { margin-bottom: var(--sp-3); }
.pillar__title { font-size: var(--fs-xl); margin-bottom: var(--sp-2); }
.pillar__body { color: var(--muted); margin-bottom: var(--sp-3); }
.pillar__list { display: grid; gap: 0.55rem; margin-top: auto; }
.pillar__list li {
  position: relative;
  padding-left: 1.15rem;
  font-size: var(--fs-sm);
  color: var(--paper);
}
.pillar__list li::before {
  content: ""; position: absolute; left: 0; top: 0.62em;
  width: 7px; height: 7px;
  background: var(--iris);
  clip-path: polygon(0 0, 100% 50%, 0 100%);
}

/* ---------- packages ---------- */
.packages {
  display: grid; gap: var(--sp-3);
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 265px), 1fr));
  align-items: stretch;
}
.pkg {
  position: relative;
  display: flex; flex-direction: column;
  padding: var(--sp-4) var(--sp-3);
  background: var(--surface);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.pkg:hover { transform: translateY(-4px); border-color: rgba(124,108,255,0.34); }

.pkg--featured {
  background: linear-gradient(168deg, var(--surface-2) 0%, var(--surface) 62%);
  border-color: rgba(124, 108, 255, 0.45);
  box-shadow: 0 24px 60px -34px var(--iris);
}
.pkg__badge {
  position: absolute; top: -11px; left: var(--sp-3);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  background: var(--amber);
  color: #1A1200;
  padding: 0.22rem 0.6rem;
  border-radius: 4px;
  font-weight: 500;
}
.pkg__kicker {
  font-family: var(--font-display);
  font-size: var(--fs-lg);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.3rem;
}
.pkg__term {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--cyan);
  letter-spacing: 0.05em;
  margin-bottom: var(--sp-2);
}
.pkg__pitch { color: var(--paper); font-size: var(--fs-sm); margin-bottom: var(--sp-3); }
.pkg__list { display: grid; gap: 0.5rem; margin-bottom: var(--sp-3); }
.pkg__list li {
  position: relative;
  padding-left: 1.1rem;
  font-size: var(--fs-sm);
  color: var(--muted);
}
.pkg__list li::before {
  content: ""; position: absolute; left: 0; top: 0.6em;
  width: 6px; height: 6px;
  background: var(--cyan);
  clip-path: polygon(0 0, 100% 50%, 0 100%);
}
/* Pin the "best for" block and the CTA to the card floor together, so the
   four cards align across the row regardless of how long each list is. */
.pkg__for {
  font-size: var(--fs-xs);
  color: var(--muted-2);
  border-top: 1px solid var(--line-soft);
  padding-top: var(--sp-2);
  margin-top: auto;
  margin-bottom: var(--sp-3);
}
.pkg .btn--block { margin-top: 0; }
.pkg__for span {
  display: block;
  font-family: var(--font-mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 0.15rem;
}
.packages__note {
  margin-top: var(--sp-4);
  color: var(--muted);
  font-size: var(--fs-sm);
  max-width: 56ch;
}

/* ---------- process ---------- */
.steps {
  display: grid; gap: var(--sp-3);
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 235px), 1fr));
  counter-reset: none;
}
.step {
  position: relative;
  padding: var(--sp-4) var(--sp-3) var(--sp-3);
  border-top: 2px solid var(--line);
  transition: border-color var(--dur) var(--ease);
}
.step:hover { border-top-color: var(--iris); }
.step__num {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  color: var(--amber);
  letter-spacing: 0.1em;
  margin-bottom: var(--sp-2);
}
.step__title { font-size: var(--fs-lg); margin-bottom: var(--sp-1); }
.step__body { font-size: var(--fs-sm); color: var(--muted); }

/* ---------- why ---------- */
.why__grid { display: grid; gap: var(--sp-5); }
.why__items { display: grid; gap: var(--sp-3); grid-template-columns: repeat(auto-fit, minmax(min(100%, 260px), 1fr)); }
.why__item {
  padding-left: var(--sp-3);
  border-left: 2px solid var(--line);
  transition: border-color var(--dur) var(--ease);
}
.why__item:hover { border-left-color: var(--cyan); }
.why__item h3 { font-size: var(--fs-lg); margin-bottom: var(--sp-1); }
.why__item p { font-size: var(--fs-sm); color: var(--muted); }
@media (min-width: 980px) {
  .why__grid { grid-template-columns: 0.85fr 1.15fr; gap: var(--sp-5); align-items: start; }
}

/* ---------- contact ---------- */
.contact__grid { display: grid; gap: var(--sp-5); }
@media (min-width: 980px) {
  .contact__grid { grid-template-columns: 0.9fr 1.1fr; gap: var(--sp-5); align-items: start; }
}

.contact__meta {
  margin: var(--sp-4) 0 0;
  display: grid; grid-template-columns: auto 1fr; gap: 0.55rem var(--sp-3);
  font-size: var(--fs-sm);
}
.contact__meta dt {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--muted-2);
}
.contact__meta dd { margin: 0; color: var(--paper); }
.contact__meta a { color: var(--cyan); border-bottom: 1px solid rgba(77,217,230,0.35); }
.contact__meta a:hover { border-bottom-color: var(--cyan); }

.form {
  display: grid; gap: var(--sp-3);
  padding: var(--sp-4);
  background: var(--surface);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
}
.form__row { display: grid; gap: var(--sp-3); grid-template-columns: repeat(auto-fit, minmax(min(100%, 200px), 1fr)); }

.field { display: grid; gap: 0.4rem; }
.field label {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--muted);
}
.field input,
.field select,
.field textarea {
  width: 100%;
  min-height: 48px;
  padding: 0.7rem 0.9rem;
  background: var(--ink);
  border: 1px solid var(--line);
  border-radius: 9px;
  color: var(--paper);
  font-family: var(--font-body);
  font-size: var(--fs-sm);
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.field textarea { min-height: 128px; resize: vertical; line-height: 1.6; }
.field input::placeholder,
.field textarea::placeholder { color: var(--muted-2); }
.field input:focus,
.field select:focus,
.field textarea:focus {
  outline: none;
  border-color: var(--iris);
  box-shadow: 0 0 0 3px rgba(124, 108, 255, 0.18);
}
.field input[aria-invalid="true"],
.field textarea[aria-invalid="true"] { border-color: #FF8B8B; }

.field select {
  appearance: none;
  background-image: linear-gradient(45deg, transparent 50%, var(--muted) 50%),
                    linear-gradient(135deg, var(--muted) 50%, transparent 50%);
  background-position: calc(100% - 19px) 21px, calc(100% - 13px) 21px;
  background-size: 6px 6px, 6px 6px;
  background-repeat: no-repeat;
  padding-right: 2.4rem;
}
.field select option { background: var(--surface); color: var(--paper); }

/* honeypot — off-screen but focusable-free */
.hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }

.form__status { font-size: var(--fs-sm); min-height: 1.2em; }
.form__status.is-ok   { color: var(--cyan); }
.form__status.is-err  { color: #FF9B9B; }
.form__fineprint { font-size: var(--fs-xs); color: var(--muted-2); }

/* ---------- footer ---------- */
.site-footer { border-top: 1px solid var(--line-soft); background: var(--ink-2); padding-block: var(--sp-5); }
.site-footer__inner { display: grid; gap: var(--sp-4); }
@media (min-width: 880px) {
  .site-footer__inner { grid-template-columns: 1.1fr 1fr 1fr; align-items: start; }
}
.site-footer__slogan {
  margin-top: 0.6rem;
  font-family: var(--font-display);
  color: var(--muted);
  font-size: var(--fs-sm);
}
.site-footer__nav { display: grid; gap: 0.55rem; align-content: start; }
.site-footer__nav a { font-size: var(--fs-sm); color: var(--muted); }
.site-footer__nav a:hover { color: var(--paper); }
.site-footer__contact { display: grid; gap: 0.6rem; align-content: start; }
.site-footer__contact a { font-size: var(--fs-sm); color: var(--cyan); }
.site-footer__legal { font-size: var(--fs-xs); color: var(--muted-2); }

/* ---------- reveal ---------- */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 620ms var(--ease), transform 620ms var(--ease);
  transition-delay: calc(var(--reveal-delay, 0) * 85ms);
}
.reveal.is-in { opacity: 1; transform: none; }

/* ---------- responsive nav ---------- */
@media (max-width: 860px) {
  .nav-toggle { display: grid; }
  .site-nav {
    position: fixed; inset: 64px 0 auto;
    flex-direction: column; align-items: stretch;
    gap: 0;
    padding: var(--sp-3) 1.25rem var(--sp-4);
    background: rgba(7, 8, 18, 0.97);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--line-soft);
    transform: translateY(-14px);
    opacity: 0; pointer-events: none;
    transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease);
  }
  .site-nav.is-open { opacity: 1; transform: none; pointer-events: auto; }
  .site-nav a { padding-block: 0.9rem; border-bottom: 1px solid var(--line-soft); font-size: var(--fs-base); }
  .site-nav .btn { margin-top: var(--sp-3); border-bottom: none; justify-content: center; }
}

/* ---------- reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .reveal { opacity: 1; transform: none; }
  .btn:hover, .pkg:hover, .pillar:hover { transform: none; }
}