/* ==========================================================================
   Teraiso — teraiso.com
   Built to "Teraiso Design System v3". All tokens below are from that file.
   ========================================================================== */

:root {
  /* ink */
  --ink-900: #1A1A1A;
  --ink-600: #565C6D;
  --ink-400: #7A7F8F;
  --body:    #3A3D44;

  /* paper */
  --paper-0:   #FFFFFF;
  --paper-50:  #F7F6F3;
  --paper-100: #EFEDE7;
  --paper-200: #E2DFD6;
  --line-grey: #C7C9D1;

  /* violet — primary accent */
  --violet-600: #6142E0;
  --violet-500: #7C5CFC;
  --violet-100: #EDE7FF;

  /* support accents */
  --orange:      #FF6B35;
  --orange-deep: #C1521E;
  --orange-100:  #FFE3D6;
  --lime:        #D9FF6B;
  --lime-100:    #E9FBCB;
  --lime-deep:   #5C7A00;

  /* spacing — 4px base */
  --s-2:  8px;
  --s-4:  16px;
  --s-6:  24px;
  --s-8:  32px;
  --s-12: 48px;
  --s-16: 64px;

  /* radius */
  --r-sm:   8px;
  --r-md:   14px;
  --r-tile: 18px;
  --r-lg:   20px;
  --r-pill: 999px;

  --shell: 1200px;
  --ease: 160ms ease;
}

/* --------------------------------------------------------------------------
   Fonts
   DEV: index.html currently loads Inter + IBM Plex Mono from Google Fonts so
   the pages preview correctly. BEFORE LAUNCH drop the woff2 files into
   /fonts, delete the <link> tags, and uncomment the @font-face block below.
   Reason: hotlinking Google Fonts sends visitor IPs to Google, which is a
   live GDPR problem for an EU-registered company. See README.md.
   -------------------------------------------------------------------------- */

/*
@font-face { font-family: 'Inter'; src: url('fonts/inter-400.woff2') format('woff2'); font-weight: 400; font-display: swap; }
@font-face { font-family: 'Inter'; src: url('fonts/inter-500.woff2') format('woff2'); font-weight: 500; font-display: swap; }
@font-face { font-family: 'Inter'; src: url('fonts/inter-700.woff2') format('woff2'); font-weight: 700; font-display: swap; }
@font-face { font-family: 'Inter'; src: url('fonts/inter-800.woff2') format('woff2'); font-weight: 800; font-display: swap; }
@font-face { font-family: 'IBM Plex Mono'; src: url('fonts/plexmono-600.woff2') format('woff2'); font-weight: 600; font-display: swap; }
*/

/* ==========================================================================
   Reset & base
   ========================================================================== */

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

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink-900);
  background: var(--paper-50);
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }

a { color: var(--violet-500); text-decoration: none; transition: color var(--ease); }
a:hover { color: var(--violet-600); }

::selection { background: var(--lime); color: var(--ink-900); }

h1, h2, h3, h4 { margin: 0; font-weight: 800; letter-spacing: -0.02em; line-height: 1.15; }
p { margin: 0 0 var(--s-4); }

:focus-visible {
  outline: 2px solid var(--violet-500);
  outline-offset: 3px;
  border-radius: 4px;
}

.skip-link {
  position: absolute; left: -9999px; top: 0;
  background: var(--ink-900); color: #fff;
  padding: 12px 20px; border-radius: 0 0 var(--r-sm) 0; z-index: 100;
}
.skip-link:focus { left: 0; color: #fff; }

/* ==========================================================================
   Layout
   ========================================================================== */

.shell { max-width: var(--shell); margin: 0 auto; padding: 0 var(--s-12); }

section { padding: 80px 0; }
section.tight { padding: 56px 0; }

.bg-paper-0   { background: var(--paper-0); }
.bg-paper-50  { background: var(--paper-50); }
.bg-paper-100 { background: var(--paper-100); }
.bg-violet    { background: var(--violet-100); }

/* full-bleed bands get a hairline so the colour change reads as structure */
.band { border-top: 1px solid var(--paper-200); border-bottom: 1px solid var(--paper-200); }

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: var(--s-6); }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--s-5, 20px); }
.split  { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: var(--s-16); align-items: center; }

/* ==========================================================================
   Type
   ========================================================================== */

.eyebrow {
  font-family: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  font-weight: 600;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--violet-500);
  margin-bottom: var(--s-2);
}
.eyebrow.muted { color: var(--ink-400); letter-spacing: 0.04em; }

.display-xl {
  font-size: clamp(2.75rem, 5vw, 4.75rem);
  line-height: 1.0;
  letter-spacing: -0.03em;
  margin: 0 0 var(--s-6);
  max-width: 20ch;
}

.display-md {
  font-size: clamp(1.75rem, 3.2vw, 2.25rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 0 0 var(--s-6);
  max-width: 22ch;
}

.heading-lg { font-size: 24px; font-weight: 700; line-height: 1.25; letter-spacing: -0.01em; }
.heading-sm { font-size: 17px; font-weight: 700; line-height: 1.3; }

.body-lg { font-size: 18px; line-height: 1.6; color: var(--ink-600); }
.body-md { font-size: 16px; line-height: 1.6; color: var(--body); }
.meta    { font-size: 13.5px; color: var(--ink-400); }

.measure    { max-width: 58ch; }
.measure-sm { max-width: 46ch; }

.lede { font-size: 19px; line-height: 1.6; color: var(--ink-600); max-width: 52ch; margin: 0 0 var(--s-8); }

/* ==========================================================================
   Buttons — pill, always
   ========================================================================== */

.btn {
  display: inline-flex; align-items: center; justify-content: center;
  font-family: inherit; font-weight: 700; font-size: 15px;
  padding: 14px 26px;
  border-radius: var(--r-pill);
  border: 1px solid transparent;
  cursor: pointer;
  text-align: center;
  transition: background var(--ease), transform var(--ease), border-color var(--ease), color var(--ease);
}
.btn-primary   { background: var(--violet-500); color: #fff; }
.btn-secondary { background: var(--paper-100); color: var(--ink-900); border-color: var(--paper-200); }
.btn-outline   { background: transparent; color: var(--ink-900); border-color: var(--line-grey); }
.btn-ghost     { background: transparent; color: var(--ink-900); }
.btn-dark      { background: var(--ink-900); color: #fff; }
.btn-sm        { font-size: 13.5px; padding: 10px 20px; }
.btn-block     { width: 100%; }

.btn:disabled, .btn[aria-disabled="true"] { opacity: 0.4; cursor: not-allowed; }

@media (prefers-reduced-motion: no-preference) {
  .btn-primary:hover:not(:disabled)   { background: var(--violet-600); transform: translateY(-2px); }
  .btn-secondary:hover:not(:disabled) { background: var(--paper-200); transform: translateY(-2px); }
  .btn-outline:hover:not(:disabled)   { background: var(--paper-100); }
  .btn-ghost:hover:not(:disabled)     { background: var(--paper-100); }
  .btn-dark:hover:not(:disabled)      { background: var(--violet-500); transform: translateY(-1px); }
}
@media (prefers-reduced-motion: reduce) {
  .btn-primary:hover   { background: var(--violet-600); }
  .btn-secondary:hover { background: var(--paper-200); }
  .btn-outline:hover, .btn-ghost:hover { background: var(--paper-100); }
  .btn-dark:hover      { background: var(--violet-500); }
}

.btn-row { display: flex; gap: var(--s-4); flex-wrap: wrap; }

/* ==========================================================================
   Badges, chips, tiles
   ========================================================================== */

.badge {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 13px; font-weight: 600;
  padding: 6px 14px; border-radius: var(--r-pill);
  background: var(--paper-100); color: var(--ink-600);
}
.badge::before { content: ''; width: 6px; height: 6px; border-radius: 50%; background: currentColor; }
.badge-hiring  { background: var(--lime-100);   color: var(--lime-deep); }
.badge-product { background: var(--violet-100); color: var(--violet-500); }
.badge-urgent  { background: var(--orange-100); color: var(--orange-deep); }

.chip {
  display: inline-block;
  font-size: 13.5px; font-weight: 500;
  padding: 8px 16px; border-radius: var(--r-pill);
  border: 1px solid var(--line-grey); color: var(--ink-600);
  background: transparent;
}
.chip-on { border-color: var(--violet-500); background: var(--violet-100); color: var(--violet-600); }
.chip-row { display: flex; gap: 10px; flex-wrap: wrap; }

/* signature shape: soft-rounded square, accent rotates violet → orange → lime */
.tile {
  width: 44px; height: 44px;
  border-radius: var(--r-md);
  display: flex; align-items: center; justify-content: center;
  color: #fff; font-weight: 700; font-size: 15px;
  flex: none;
}
.tile-lg { width: 64px; height: 64px; border-radius: var(--r-tile); font-size: 20px; }
.tile-1 { background: var(--violet-500); }
.tile-2 { background: var(--orange); }
.tile-3 { background: var(--lime-deep); }

/* ==========================================================================
   Cards
   ========================================================================== */

.card {
  background: var(--paper-0);
  border: 1px solid var(--paper-200);
  border-radius: var(--r-lg);
  padding: var(--s-6);
}
.card-lg { padding: var(--s-8); }

@media (prefers-reduced-motion: no-preference) {
  .card-hover { transition: transform var(--ease), box-shadow var(--ease), border-color var(--ease); }
  .card-hover:hover { transform: translateY(-4px); box-shadow: 0 12px 28px rgba(26,26,26,0.08); }
}

.card-primary { border-color: var(--violet-500); }

/* stat cards — the proof strip */
.stat-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--s-4); }
.stat {
  background: var(--paper-0);
  border: 1px solid var(--paper-200);
  border-radius: var(--r-md);
  padding: var(--s-6);
}
.stat .value {
  font-size: 40px; font-weight: 800; letter-spacing: -0.03em; line-height: 1;
  color: var(--violet-500); margin-bottom: var(--s-2);
}
.stat .label { font-size: 14px; color: var(--ink-600); line-height: 1.4; }

/* inline stat, label left / value right (design system trustStats) */
.stat-inline {
  background: var(--paper-50);
  border: 1px solid var(--paper-200);
  border-radius: var(--r-md);
  padding: 20px 24px;
  display: flex; justify-content: space-between; align-items: center; gap: var(--s-4);
}
.stat-inline .label { font-size: 14px; color: var(--ink-600); }
.stat-inline .value { font-size: 22px; font-weight: 800; color: var(--violet-500); }

/* ==========================================================================
   Numbered rows — the process
   ========================================================================== */

.steps { border-top: 1px solid var(--paper-200); }
.step {
  display: grid; grid-template-columns: 140px 1fr; gap: var(--s-8);
  padding: var(--s-8) 0;
  border-bottom: 1px solid var(--paper-200);
}
.step .num {
  font-family: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  font-weight: 600; font-size: 12px; letter-spacing: 0.06em; text-transform: uppercase;
  color: var(--violet-500);
}
.step .num span { display: block; color: var(--ink-400); margin-top: 4px; letter-spacing: 0.03em; }
.step h3 { font-size: 20px; font-weight: 700; margin-bottom: var(--s-2); letter-spacing: -0.01em; }
.step p { color: var(--body); margin-bottom: 0; }
.step .yield {
  margin-top: var(--s-4); font-size: 14.5px; color: var(--ink-600);
  padding-left: var(--s-4); border-left: 2px solid var(--orange);
}

/* dash list, orange-deep marker */
.dash-list { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 10px; }
.dash-list li { display: flex; gap: 10px; font-size: 15px; line-height: 1.5; color: var(--body); }
.dash-list li::before { content: '—'; color: var(--orange-deep); flex: none; }
.dash-list.neg li::before { content: '×'; color: var(--ink-400); }

/* inline text highlights — for pulling a phrase out of a long paragraph */
.hl { font-weight: 700; }
.hl-violet { color: var(--violet-500); }
.hl-orange { color: var(--orange-deep); }
.hl-lime   { color: var(--lime-deep); }

/* ==========================================================================
   Forms
   ========================================================================== */

.field { display: flex; flex-direction: column; gap: 6px; margin-bottom: var(--s-4); }
.field label { font-size: 13px; font-weight: 500; color: var(--ink-600); }
.field .hint { font-size: 13px; color: var(--ink-400); line-height: 1.5; }

input[type="text"], input[type="email"], input[type="url"], select, textarea {
  font-family: inherit; font-size: 15px;
  padding: 12px 16px;
  border-radius: var(--r-md);
  border: 1px solid var(--paper-200);
  background: var(--paper-50);
  color: var(--ink-900);
  width: 100%;
  transition: border-color var(--ease), box-shadow var(--ease);
}
textarea { min-height: 120px; resize: vertical; }

input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--violet-500);
  box-shadow: 0 0 0 3px var(--violet-100);
}
input[aria-invalid="true"], textarea[aria-invalid="true"] { border-color: var(--orange-deep); }
.field .error { font-size: 13px; color: var(--orange-deep); }

.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: var(--s-4); }

.form-note { font-size: 13.5px; color: var(--ink-400); margin-top: var(--s-4); }

/* honeypot */
.hp { position: absolute; left: -9999px; opacity: 0; height: 0; overflow: hidden; }

.form-success {
  background: var(--lime-100);
  border: 1px solid var(--lime-deep);
  border-radius: var(--r-lg);
  padding: var(--s-8);
  color: var(--lime-deep);
}
.form-success h3 { color: var(--ink-900); margin-bottom: var(--s-2); font-size: 20px; }
.form-success p { color: var(--body); margin: 0; }

/* ==========================================================================
   FAQ — native details/summary, no JS
   ========================================================================== */

.faq { border-top: 1px solid var(--paper-200); }
.faq details { border-bottom: 1px solid var(--paper-200); }
.faq summary {
  list-style: none; cursor: pointer;
  padding: var(--s-6) 40px var(--s-6) 0;
  font-size: 17px; font-weight: 700; letter-spacing: -0.01em;
  position: relative;
  transition: color var(--ease);
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary:hover { color: var(--violet-500); }
.faq summary::after {
  content: ''; position: absolute; right: 8px; top: 50%;
  width: 9px; height: 9px;
  border-right: 2px solid var(--ink-400); border-bottom: 2px solid var(--ink-400);
  transform: translateY(-70%) rotate(45deg);
  transition: transform var(--ease);
}
.faq details[open] summary::after { transform: translateY(-30%) rotate(-135deg); }
.faq .answer { padding: 0 0 var(--s-6); color: var(--body); max-width: 62ch; }
.faq .answer p:last-child { margin-bottom: 0; }

/* ==========================================================================
   Nav
   ========================================================================== */

.nav {
  position: sticky; top: 0; z-index: 20;
  background: var(--paper-50);
  border-bottom: 1px solid var(--paper-200);
}
.nav-inner {
  max-width: var(--shell); margin: 0 auto;
  padding: 18px var(--s-12);
  display: flex; align-items: center; justify-content: space-between; gap: var(--s-6);
}
.wordmark {
  font-weight: 800; font-size: 20px; letter-spacing: -0.02em; color: var(--ink-900);
}
.wordmark:hover { color: var(--violet-500); }
.nav-links { display: flex; align-items: center; gap: 28px; }
.nav-links a {
  font-size: 13.5px; font-weight: 500; color: var(--ink-600);
}
.nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--violet-500); }
/* the CTA inside .nav-links is the mobile-panel copy only; .nav-cta owns desktop */
.nav-links .btn { display: none; }
.nav-cta { display: flex; align-items: center; gap: var(--s-4); }

.nav-toggle {
  display: none;
  background: transparent; border: 1px solid var(--paper-200);
  border-radius: var(--r-pill); padding: 10px 16px;
  font-family: inherit; font-size: 13.5px; font-weight: 600; color: var(--ink-900);
  cursor: pointer;
}

/* ==========================================================================
   Footer
   ========================================================================== */

.footer { background: var(--paper-100); border-top: 1px solid var(--paper-200); padding: var(--s-16) 0 var(--s-8); }
.footer-cols { display: flex; gap: var(--s-16); flex-wrap: wrap; }
.footer-brand { flex: 1 1 220px; }
.footer-brand .wordmark { font-size: 22px; display: block; margin-bottom: var(--s-2); }
.footer-brand p { font-size: 14px; color: var(--ink-400); margin: 0; }
.footer-col { min-width: 150px; display: flex; flex-direction: column; gap: 10px; }
.footer-col .title {
  font-family: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 11px; color: var(--ink-400); text-transform: uppercase; letter-spacing: 0.06em;
  margin-bottom: 4px;
}
.footer-col a { font-size: 14px; color: var(--ink-600); }
.footer-col a:hover { color: var(--violet-500); }
.footer-legal {
  margin-top: var(--s-12); padding-top: var(--s-6);
  border-top: 1px solid var(--paper-200);
  font-size: 13px; color: var(--ink-400);
  display: flex; justify-content: space-between; gap: var(--s-6); flex-wrap: wrap;
}

/* ==========================================================================
   Utilities
   ========================================================================== */

.stack-2  > * + * { margin-top: var(--s-2); }
.stack-4  > * + * { margin-top: var(--s-4); }
.stack-6  > * + * { margin-top: var(--s-6); }
.stack-8  > * + * { margin-top: var(--s-8); }
.mt-6  { margin-top: var(--s-6); }
.mt-8  { margin-top: var(--s-8); }
.mt-12 { margin-top: var(--s-12); }
.mb-8  { margin-bottom: var(--s-8); }
.mb-12 { margin-bottom: var(--s-12); }
.text-ink-600 { color: var(--ink-600); }
.no-mb { margin-bottom: 0; }

.section-head { margin-bottom: var(--s-12); }
.section-head .display-md { margin-bottom: var(--s-4); }

/* case illustration — wide net of noise funnelling to a properly-read few */
.case-illustration { display: flex; flex-direction: column; gap: var(--s-6); align-items: flex-start; }
.noise-cluster { display: flex; flex-wrap: wrap; gap: 8px; max-width: 230px; }
.noise-cluster span { width: 20px; height: 20px; border-radius: 6px; background: var(--paper-200); flex: none; }
.noise-cluster span:nth-child(3n) { background: var(--line-grey); }
.signal-row { display: flex; gap: var(--s-4); }
.case-illustration .meta { margin: 0; }

/* comparison table — tint the primary column */
.col-embedded { background: var(--violet-100) !important; }
.col-embedded.col-head { color: var(--violet-600) !important; }

/* portrait slot — empty until the photo exists */
.portrait {
  aspect-ratio: 4 / 5;
  border-radius: var(--r-lg);
  background: var(--paper-100);
  border: 1px solid var(--paper-200);
  display: flex; align-items: center; justify-content: center;
  color: var(--ink-400); font-size: 13.5px; text-align: center; padding: var(--s-6);
  overflow: hidden;
}
.portrait img { width: 100%; height: 100%; object-fit: cover; }

/* ==========================================================================
   Responsive
   ========================================================================== */

@media (max-width: 1024px) {
  .shell, .nav-inner { padding-left: var(--s-8); padding-right: var(--s-8); }
  .split { grid-template-columns: 1fr; gap: var(--s-8); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .step { grid-template-columns: 110px 1fr; gap: var(--s-6); }
}

@media (max-width: 720px) {
  section { padding: 56px 0; }
  .shell, .nav-inner { padding-left: var(--s-6); padding-right: var(--s-6); }

  .display-xl { font-size: 2.5rem; letter-spacing: -0.02em; }
  .lede { font-size: 17px; }

  .grid-2, .grid-3, .stat-row, .field-row { grid-template-columns: 1fr; }
  .step { grid-template-columns: 1fr; gap: var(--s-4); }
  .footer-cols { gap: var(--s-8); }
  .footer-legal { flex-direction: column; gap: var(--s-2); }

  .btn-row .btn { flex: 1 1 100%; }

  /* nav collapses */
  .nav-toggle { display: block; }
  .nav-links {
    display: none;
    position: absolute; left: 0; right: 0; top: 100%;
    background: var(--paper-50);
    border-bottom: 1px solid var(--paper-200);
    flex-direction: column; align-items: stretch; gap: 0;
    padding: var(--s-2) var(--s-6) var(--s-6);
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 14px 0; font-size: 16px; border-bottom: 1px solid var(--paper-200); }
  .nav-links .btn { display: inline-flex; margin-top: var(--s-4); padding: 14px 26px; border-bottom: none; }
  .nav-inner { position: relative; }
  .nav-cta .btn { display: none; }
}