/* ============================================================
   Infinity Engineering Solutions — design tokens
   Type system: one family (IBM Plex), three roles — serif for
   display, sans for body, mono for numerals/data.
   Color: brand blue/red used as precise accents, not fills.
   ============================================================ */
:root {
  --ink: #0C0E11;
  --ink-panel: #14171B;
  --paper: #F4F1E9;
  --paper-deep: #ECE7DA;
  --white: #FFFFFF;

  --line-on-dark: rgba(247, 245, 240, 0.14);
  --line-on-paper: rgba(12, 14, 17, 0.12);

  --text-on-dark: #F1EEE7;
  --text-dim-on-dark: #9B968C;
  --text-on-paper: #201D18;
  --text-dim-on-paper: #6B665C;

  --blue: #056DB4;
  --blue-deep: #044F82;
  --red: #DF3825;
  --red-deep: #B32C1D;

  --font-display: 'IBM Plex Serif', Georgia, serif;
  --font-body: 'IBM Plex Sans', -apple-system, sans-serif;
  --font-mono: 'IBM Plex Mono', monospace;

  --wrap: 1180px;
  --wrap-narrow: 860px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--text-on-paper);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.12;
  margin: 0 0 0.5em;
  letter-spacing: -0.01em;
}

p { margin: 0 0 1em; max-width: 60ch; }
a { color: inherit; text-decoration: none; }

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 32px; }
.wrap-narrow { max-width: var(--wrap-narrow); margin: 0 auto; padding: 0 32px; }

/* section tone helpers */
.on-dark { background: var(--ink); color: var(--text-on-dark); }
.on-dark h1, .on-dark h2, .on-dark h3, .on-dark h4 { color: var(--white); }
.on-dark p { color: var(--text-dim-on-dark); }
.on-paper { background: var(--paper); color: var(--text-on-paper); }
.on-paper-deep { background: var(--paper-deep); color: var(--text-on-paper); }
.on-paper p, .on-paper-deep p { color: var(--text-dim-on-paper); }

/* ============================================================
   Buttons
   ============================================================ */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  padding: 14px 28px; font-family: var(--font-body); font-weight: 500; font-size: 0.92rem;
  border-radius: 2px; border: 1px solid transparent; cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease, opacity 0.15s ease;
  white-space: nowrap; letter-spacing: 0.01em;
}
.btn-primary { background: var(--red); color: #fff; }
.btn-primary:hover { background: var(--red-deep); }
.btn-ghost-dark { background: transparent; border-color: var(--line-on-dark); color: var(--text-on-dark); }
.btn-ghost-dark:hover { border-color: var(--text-on-dark); }
.btn-ghost { background: transparent; border-color: var(--line-on-paper); color: var(--text-on-paper); }
.btn-ghost:hover { border-color: var(--text-on-paper); }
.btn-small { padding: 10px 18px; font-size: 0.82rem; }
.btn-full { width: 100%; }

/* ============================================================
   Header
   ============================================================ */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(244, 241, 233, 0.88);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line-on-paper);
}
.header-inner { display: flex; align-items: center; gap: 36px; padding-top: 16px; padding-bottom: 16px; }
.brand { display: flex; align-items: center; gap: 12px; margin-right: auto; }
.brand img { height: 32px; width: auto; display: block; }
.brand-word { display: flex; flex-direction: column; line-height: 1; }
.brand-word .b-infinity { font-family: var(--font-display); font-weight: 600; font-size: 1.05rem; color: var(--text-on-paper); }
.brand-word .b-sub { font-size: 0.55rem; font-weight: 500; letter-spacing: 0.1em; color: var(--text-dim-on-paper); margin-top: 2px; }

.main-nav { display: flex; gap: 32px; }
.main-nav a { font-size: 0.88rem; color: var(--text-dim-on-paper); transition: color 0.15s ease; }
.main-nav a:hover { color: var(--text-on-paper); }

.header-actions { display: flex; align-items: center; gap: 24px; }
.phone-link { font-size: 0.86rem; color: var(--text-dim-on-paper); font-family: var(--font-mono); }

.nav-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: 6px; }
.nav-toggle span { width: 20px; height: 1px; background: var(--text-on-paper); display: block; }

/* ============================================================
   Utility bar
   ============================================================ */
.utility-bar { border-bottom: 1px solid var(--line-on-dark); }
.utility-inner {
  display: flex; align-items: center; justify-content: space-between;
  padding: 9px 0; font-size: 0.78rem; color: var(--text-dim-on-dark); font-family: var(--font-mono);
}
.utility-right { display: flex; align-items: center; gap: 10px; }
.utility-right a { color: var(--text-on-dark); }
.utility-right a:hover { color: var(--blue); }
.utility-sep { color: var(--text-dim-on-dark); }

/* ============================================================
   Hero (dark, centered)
   ============================================================ */
.hero {
  position: relative;
  padding-top: 96px;
  padding-bottom: 96px;
  overflow: hidden;
  text-align: center;
}
.hero-bg {
  position: absolute; inset: 0; z-index: 0;
  background-image:
    radial-gradient(ellipse 900px 600px at 20% -10%, rgba(5,109,180,0.22), transparent),
    radial-gradient(ellipse 800px 600px at 100% 0%, rgba(223,56,37,0.14), transparent),
    linear-gradient(var(--line-on-dark) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-on-dark) 1px, transparent 1px);
  background-size: auto, auto, 56px 56px, 56px 56px;
  background-position: center;
  mask-image: linear-gradient(to bottom, black 0%, black 65%, transparent 100%);
}
.hero-bg::after {
  content: '';
  position: absolute; inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.05'/%3E%3C/svg%3E");
}
.hero-inner { position: relative; z-index: 1; max-width: 780px; margin: 0 auto; }

.hero-badge {
  display: inline-block; font-size: 0.82rem; color: var(--text-on-dark);
  border: 1px solid var(--line-on-dark); border-radius: 999px; padding: 9px 20px;
  margin-bottom: 30px; background: rgba(255,255,255,0.03);
}

h1 { font-size: clamp(2.4rem, 5.4vw, 4.2rem); color: var(--white); margin: 0 auto 22px; max-width: 16ch; }
.hero-lede { font-size: 1.1rem; max-width: 52ch; color: var(--text-dim-on-dark); margin: 0 auto 34px; }

.hero-pills { display: flex; justify-content: center; flex-wrap: wrap; gap: 12px; margin-bottom: 40px; }
.hero-pill {
  display: inline-flex; align-items: center; gap: 9px;
  border: 1px solid var(--line-on-dark); border-radius: 999px; padding: 10px 18px;
  font-size: 0.85rem; color: var(--text-on-dark); background: rgba(255,255,255,0.03);
}
.hero-pill svg { color: var(--blue); flex-shrink: 0; }
.hero-pill:nth-child(3) svg { color: var(--red); }

.btn-large { padding: 17px 34px; font-size: 1rem; }

.hero-copy > * { opacity: 0; animation: rise 0.7s ease forwards; }
.hero-copy .hero-badge { animation-delay: 0.05s; }
.hero-copy h1 { animation-delay: 0.15s; }
.hero-copy .hero-lede { animation-delay: 0.26s; }
.hero-copy .hero-pills { animation-delay: 0.36s; }
.hero-copy .btn-large { animation-delay: 0.46s; }
@keyframes rise { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: translateY(0); } }

/* ============================================================
   Section shared
   ============================================================ */
section { padding: 108px 0; }
.section-head { max-width: 560px; margin-bottom: 56px; }
.eyebrow-num { font-family: var(--font-mono); font-size: 0.78rem; color: var(--blue); display: block; margin-bottom: 14px; }
.section-head h2 { font-size: clamp(1.7rem, 2.8vw, 2.4rem); }
.on-dark .eyebrow-num { color: var(--red); }

/* ============================================================
   Services — editorial split, no cards
   ============================================================ */
.services { padding-top: 100px; }
.service-split {
  display: grid;
  grid-template-columns: 1fr 1px 1fr;
  gap: 56px;
}
.service-divider { background: var(--line-on-paper); }
.service-block { padding-top: 4px; }
.service-index { font-family: var(--font-mono); font-size: 0.8rem; color: var(--text-dim-on-paper); display: block; margin-bottom: 18px; }
.service-block h3 { font-size: 1.35rem; display: flex; align-items: center; gap: 12px; }
.service-block h3 svg { flex-shrink: 0; }
.service-blue h3 svg { color: var(--blue); }
.service-red h3 svg { color: var(--red); }

.service-list { list-style: none; padding: 0; margin: 22px 0 0; }
.service-list li {
  padding: 13px 0; border-top: 1px solid var(--line-on-paper);
  color: var(--text-dim-on-paper); font-size: 0.95rem;
}
.service-list li:first-child { border-top: none; }

/* ============================================================
   Clients — masthead-style wordmark row
   ============================================================ */
.clients-strip { padding-top: 0; padding-bottom: 0; }
.client-masthead {
  display: flex; flex-wrap: wrap;
  border-top: 1px solid var(--line-on-paper);
  border-bottom: 1px solid var(--line-on-paper);
}
.client-masthead span {
  font-family: var(--font-display);
  font-size: 1.1rem;
  padding: 26px 36px;
  border-right: 1px solid var(--line-on-paper);
  color: var(--text-on-paper);
}
.client-masthead span:last-child { border-right: none; }

/* ============================================================
   Case studies — editorial accordion, no avatar circles
   ============================================================ */
.case-note {
  font-size: 0.86rem; color: var(--text-dim-on-paper);
  border-left: 2px solid var(--line-on-paper); padding-left: 18px;
  margin: -24px 0 48px; max-width: 640px;
}
.case-note strong { color: var(--text-on-paper); }

.case-list { border-top: 1px solid var(--line-on-paper); }
.case-item { border-bottom: 1px solid var(--line-on-paper); }

.case-toggle {
  width: 100%; display: flex; align-items: baseline; gap: 28px;
  background: none; border: none; cursor: pointer; padding: 26px 0; text-align: left; font-family: inherit;
}
.case-index { font-family: var(--font-mono); font-size: 0.85rem; color: var(--text-dim-on-paper); flex-shrink: 0; width: 28px; }
.case-heading { flex: 1; min-width: 0; display: flex; align-items: baseline; gap: 16px; flex-wrap: wrap; }
.case-name { font-family: var(--font-display); font-weight: 600; font-size: 1.15rem; color: var(--text-on-paper); }
.case-tag { font-size: 0.85rem; color: var(--text-dim-on-paper); }

.case-chevron { flex-shrink: 0; transition: transform 0.2s ease; color: var(--text-dim-on-paper); }
.case-toggle[aria-expanded="true"] .case-chevron { transform: rotate(45deg); }

.case-panel { overflow: hidden; max-height: 0; transition: max-height 0.28s ease; }
.case-item.is-open .case-panel { max-height: 480px; }

.case-panel-inner { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; padding: 4px 0 32px 56px; }
.case-panel-inner h4 {
  font-family: var(--font-mono); font-size: 0.7rem; font-weight: 500; letter-spacing: 0.06em;
  color: var(--text-dim-on-paper); margin-bottom: 8px; text-transform: uppercase;
}
.case-panel-inner p { font-size: 0.93rem; margin-bottom: 0; color: var(--text-dim-on-paper); }
.case-desc { padding: 4px 0 30px 56px; font-size: 0.95rem; color: var(--text-dim-on-paper); max-width: 62ch; margin: 0; }

/* ============================================================
   Story
   ============================================================ */
.story { padding: 96px 0; }
.story-lede {
  font-family: var(--font-display); font-weight: 500; font-style: italic;
  font-size: clamp(1.3rem, 2.4vw, 1.7rem); color: var(--white); line-height: 1.4;
  max-width: none; margin-bottom: 28px;
}
.story-body { font-size: 1.02rem; max-width: none; }

/* ============================================================
   Comparison
   ============================================================ */
.compare-table { border-top: 1px solid var(--line-on-paper); }
.compare-row {
  display: grid; grid-template-columns: 140px 1fr 1fr; gap: 24px;
  padding: 18px 0; border-bottom: 1px solid var(--line-on-paper); align-items: baseline;
}
.compare-head { padding-top: 0; font-family: var(--font-mono); font-size: 0.76rem; letter-spacing: 0.04em; color: var(--text-dim-on-paper); text-transform: uppercase; }
.compare-label { font-family: var(--font-mono); font-size: 0.8rem; color: var(--text-dim-on-paper); }
.compare-no { color: var(--text-dim-on-paper); font-size: 0.95rem; }
.compare-yes { color: var(--text-on-paper); font-size: 0.95rem; font-weight: 500; }
.compare-yes::before { content: '— '; color: var(--blue); }

/* ============================================================
   FAQ
   ============================================================ */
.faq-list { border-top: 1px solid var(--line-on-paper); }
.faq-item { border-bottom: 1px solid var(--line-on-paper); }
.faq-toggle {
  width: 100%; display: flex; align-items: center; justify-content: space-between; gap: 24px;
  background: none; border: none; cursor: pointer; padding: 22px 0; text-align: left;
  font-family: var(--font-body); font-size: 1rem; color: var(--text-on-paper);
}
.faq-chevron { flex-shrink: 0; transition: transform 0.2s ease; color: var(--text-dim-on-paper); }
.faq-toggle[aria-expanded="true"] .faq-chevron { transform: rotate(45deg); }
.faq-panel { overflow: hidden; max-height: 0; transition: max-height 0.28s ease; }
.faq-item.is-open .faq-panel { max-height: 200px; }
.faq-panel p { padding: 0 0 26px; font-size: 0.95rem; color: var(--text-dim-on-paper); max-width: 62ch; }

/* ============================================================
   Process (dark)
   ============================================================ */
.process-list { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(4, 1fr); gap: 40px; }
.process-list li { border-top: 1px solid var(--line-on-dark); padding-top: 24px; }
.process-num { font-family: var(--font-mono); font-size: 0.8rem; margin-bottom: 14px; display: block; }
.process-list li:nth-child(odd) .process-num { color: var(--blue); }
.process-list li:nth-child(even) .process-num { color: var(--red); }
.process-list h3 { font-size: 1.1rem; margin-bottom: 8px; color: var(--white); }
.process-list p { font-size: 0.92rem; }

/* ============================================================
   Contact (dark, elevated paper form)
   ============================================================ */
.contact-inner { display: grid; grid-template-columns: 0.8fr 1.2fr; gap: 64px; align-items: start; }
.contact-info h2 { color: var(--white); }
.contact-details { list-style: none; padding: 0; margin: 26px 0 30px; display: flex; flex-direction: column; gap: 14px; }
.contact-details li { display: flex; align-items: center; gap: 12px; color: var(--text-dim-on-dark); font-size: 0.95rem; font-family: var(--font-mono); }
.contact-details svg { color: var(--red); flex-shrink: 0; }
.contact-details a:hover { color: var(--white); }

.whatsapp-link {
  display: inline-flex; align-items: center; gap: 10px; color: var(--text-on-dark); font-size: 0.9rem;
  border: 1px solid var(--line-on-dark); padding: 11px 20px; border-radius: 2px;
  transition: border-color 0.15s ease;
}
.whatsapp-link:hover { border-color: var(--text-on-dark); }
.whatsapp-link svg { color: #3FBF6F; }

.contact-form {
  background: var(--paper); color: var(--text-on-paper);
  border-radius: 3px; padding: 40px;
  display: flex; flex-direction: column; gap: 20px;
  box-shadow: 0 40px 80px -30px rgba(0,0,0,0.5);
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.contact-form label { display: flex; flex-direction: column; gap: 8px; font-size: 0.82rem; color: var(--text-dim-on-paper); }
.contact-form input, .contact-form select, .contact-form textarea {
  background: var(--white); border: 1px solid var(--line-on-paper); border-radius: 2px; padding: 12px 14px;
  color: var(--text-on-paper); font-family: var(--font-body); font-size: 0.95rem; resize: vertical;
}
.contact-form input:focus, .contact-form select:focus, .contact-form textarea:focus { outline: none; border-color: var(--blue); }
.form-status { font-size: 0.86rem; color: var(--blue); min-height: 1.2em; margin: 0; }
.form-status.is-error { color: var(--red); }

/* ============================================================
   Footer (dark)
   ============================================================ */
.site-footer { border-top: 1px solid var(--line-on-dark); padding: 56px 0 32px; }
.footer-inner { display: grid; grid-template-columns: auto 1fr auto; gap: 32px; align-items: center; }
.footer-brand img { height: 28px; width: auto; opacity: 0.9; }
.footer-links { display: flex; gap: 24px; font-size: 0.86rem; color: var(--text-dim-on-dark); justify-content: center; }
.footer-links a:hover { color: var(--white); }
.footer-copy { font-size: 0.78rem; color: var(--text-dim-on-dark); white-space: nowrap; font-family: var(--font-mono); }

/* ============================================================
   Focus visibility
   ============================================================ */
a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible {
  outline: 2px solid var(--blue); outline-offset: 2px;
}

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 960px) {
  .service-split { grid-template-columns: 1fr; }
  .service-divider { display: none; }
  .why-grid { grid-template-columns: 1fr; }
  .process-list { grid-template-columns: 1fr 1fr; }
  .contact-inner { grid-template-columns: 1fr; }
  .case-panel-inner { grid-template-columns: 1fr; padding-left: 56px; }
  .case-desc { padding-left: 56px; }
  .hero-pills { gap: 8px; }
}

@media (max-width: 760px) {
  .compare-row { grid-template-columns: 1fr; gap: 4px; }
  .compare-label { display: none; }
  .compare-head span:first-child { display: none; }
  .main-nav, .header-actions .phone-link { display: none; }
  .nav-toggle { display: flex; }
  .form-row { grid-template-columns: 1fr; }
  .process-list { grid-template-columns: 1fr; }
  .case-panel-inner { padding-left: 0; }
  .case-desc { padding-left: 0; }
  .case-toggle { gap: 16px; }
  .client-masthead span { padding: 18px 20px; font-size: 0.95rem; }
  .footer-inner { grid-template-columns: 1fr; text-align: center; }
  .footer-links { justify-content: center; }

  .main-nav.is-open {
    display: flex; flex-direction: column; position: absolute; top: 100%; left: 0; right: 0;
    background: var(--paper); border-bottom: 1px solid var(--line-on-paper); padding: 20px 32px; gap: 18px;
  }
}