/* =============================================================
   SX Analytics — Design System
   Minimalist consultancy theme. Single accent (#2563EB).
   ============================================================= */

:root {
  /* Color */
  --color-bg: #FFFFFF;
  --color-bg-subtle: #FAFAFA;
  --color-bg-dark: #0A0A0A;
  --color-text: #0A0A0A;
  --color-text-muted: #6B7280;
  --color-text-on-dark: #FAFAFA;
  --color-text-on-dark-muted: #D4D4D8;
  --color-border: #E5E7EB;
  --color-border-dark: #262626;
  --color-accent: #2563EB;        /* electric blue — single brand accent */
  --color-accent-hover: #1D4ED8;  /* deeper press state */

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

  /* Spacing scale */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* Layout */
  --container-max: 1200px;
  --container-pad: 1.5rem;
  --radius: 8px;
  --radius-lg: 12px;

  /* Motion */
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

/* ----- Reset ----- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
img, svg { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; border: 0; background: none; color: inherit; }

/* ----- Typography ----- */
h1, h2, h3, h4 {
  margin: 0 0 var(--space-6);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.1;
}
h1 { font-size: clamp(2.5rem, 5.5vw + 0.5rem, 4.5rem); font-weight: 700; letter-spacing: -0.035em; }
h2 { font-size: clamp(2rem, 3vw + 0.5rem, 3rem); }
h3 { font-size: 1.375rem; }
p  { margin: 0 0 var(--space-4); color: var(--color-text-muted); }
.lead { font-size: clamp(1.125rem, 1vw + 0.875rem, 1.375rem); line-height: 1.5; color: var(--color-text-muted); max-width: 38em; }

.eyebrow {
  display: inline-block;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-4);
}

/* ----- Layout ----- */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-pad);
}
.section { padding: var(--space-24) 0; }
.section--tight { padding: var(--space-16) 0; }
.section--dark {
  background: var(--color-bg-dark);
  color: var(--color-text-on-dark);
}
.section--dark p, .section--dark .lead { color: var(--color-text-on-dark-muted); }
/* On dark, the accent green stays for buttons + eyebrows + numbers — adds the brand pop everywhere. */
.section--subtle { background: var(--color-bg-subtle); }

.section-head { max-width: 42rem; margin-bottom: var(--space-16); }
.section-head--center { margin-left: auto; margin-right: auto; text-align: center; }

/* ----- Buttons ----- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.875rem 1.5rem;
  font-size: 0.9375rem;
  font-weight: 500;
  border-radius: var(--radius);
  transition: background 160ms var(--ease), color 160ms var(--ease), transform 160ms var(--ease), border-color 160ms var(--ease);
  white-space: nowrap;
}
.btn:active { transform: translateY(1px); }
.btn--primary {
  background: var(--color-accent);
  color: #FFFFFF;
}
.btn--primary:hover { background: var(--color-accent-hover); }
.btn--secondary {
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
}
.btn--secondary:hover { border-color: var(--color-text); }
.section--dark .btn--secondary {
  color: var(--color-text-on-dark);
  border-color: var(--color-border-dark);
}
.section--dark .btn--secondary:hover { border-color: var(--color-text-on-dark); }

/* ----- Header / Nav ----- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--color-border);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}
.nav__brand {
  font-weight: 700;
  font-size: 1.0625rem;
  letter-spacing: -0.02em;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}
.nav__brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  background: var(--color-text);
  color: #FFFFFF;
  border-radius: 6px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0;
}
.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-8);
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav__link {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  font-weight: 500;
  transition: color 140ms var(--ease);
}
.nav__link:hover, .nav__link[aria-current="page"] { color: var(--color-text); }
.nav__cta { display: flex; align-items: center; gap: var(--space-3); }

.nav__toggle {
  display: none;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius);
}
.nav__toggle span {
  display: block;
  width: 18px;
  height: 1.5px;
  background: var(--color-text);
  position: relative;
}
.nav__toggle span::before, .nav__toggle span::after {
  content: '';
  position: absolute;
  left: 0;
  width: 18px;
  height: 1.5px;
  background: var(--color-text);
}
.nav__toggle span::before { top: -6px; }
.nav__toggle span::after  { top: 6px; }

@media (max-width: 820px) {
  .nav__toggle { display: inline-flex; }
  .nav__links, .nav__cta {
    display: none;
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-6) var(--container-pad);
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-4);
  }
  .nav.is-open .nav__links,
  .nav.is-open .nav__cta { display: flex; }
  .nav.is-open .nav__cta { top: auto; border-bottom: 0; padding-top: 0; }
}

/* ----- Hero ----- */
.hero {
  padding: clamp(3rem, 6vw, 5rem) 0 clamp(2rem, 3vw, 3rem);
}
/* When a content section follows the hero directly, tighten the seam —
   the hero already provides bottom breathing room, so the section's
   default 6rem top padding stacks into ~200px of empty air. */
.hero + .section,
.hero + .subnav,
.hero + .subnav + .service-section { padding-top: var(--space-12); }
.hero__inner { max-width: 56rem; }
.hero__title { margin-bottom: var(--space-5, 1.25rem); }
.hero__tagline {
  font-size: clamp(1.125rem, 1vw + 0.875rem, 1.5rem);
  font-weight: 500;
  letter-spacing: -0.01em;
  line-height: 1.35;
  margin: 0 0 var(--space-8);
  color: inherit;
}
.hero__lead { margin-bottom: var(--space-10, var(--space-8)); }
.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-8);
}

/* ----- Services grid ----- */
.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
}
@media (max-width: 900px) {
  .cards { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 560px) {
  .cards { grid-template-columns: 1fr; }
}
.card {
  position: relative;
  padding: var(--space-8);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: border-color 160ms var(--ease), transform 160ms var(--ease);
}
.card:hover { border-color: var(--color-text); transform: translateY(-2px); }
.card__num {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-accent);
  letter-spacing: 0.08em;
  margin-bottom: var(--space-4);
}
.card h3 { margin-bottom: var(--space-3); }
.card p  { margin: 0; }

/* ----- Quiet credential strip below services cards ----- */
.services-footnote {
  text-align: center;
  margin: var(--space-12) 0 0;
  font-size: 0.875rem;
  color: var(--color-text-muted);
  letter-spacing: 0.02em;
}

/* ----- Logo wall ----- */
.logo-wall {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: var(--space-6) var(--space-8);
  align-items: center;
  justify-items: center;
  margin-top: var(--space-12);
}
@media (max-width: 980px) {
  .logo-wall { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 560px) {
  .logo-wall { grid-template-columns: repeat(2, 1fr); }
}
.logo-wall__item {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  min-height: 88px;
  color: var(--color-text-muted);
  font-weight: 600;
  letter-spacing: -0.01em;
  font-size: 1rem;
  opacity: 0.85;
  transition: opacity 160ms var(--ease);
}
.logo-wall__item:hover { opacity: 1; }
.logo-wall__item img {
  max-height: 72px;
  max-width: 180px;
  width: auto;
  height: auto;
  object-fit: contain;
}
.logo-wall__fallback { display: none; }

/* ----- Pillars ----- */
.pillars {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--space-8);
  margin-top: var(--space-12);
}
.pillar__num {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-accent);
  letter-spacing: 0.08em;
  margin-bottom: var(--space-4);
}
.pillar h3 { color: var(--color-text-on-dark); margin-bottom: var(--space-3); }
.pillar p  { color: var(--color-text-on-dark-muted); margin: 0; }

/* ----- CTA strip ----- */
.cta {
  text-align: center;
  padding: var(--space-32) var(--container-pad);
}
.cta h2 { margin-bottom: var(--space-6); }
.cta__actions {
  display: inline-flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-3);
  margin-top: var(--space-6);
}

/* ----- Footer ----- */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: var(--space-16) 0 var(--space-8);
  font-size: 0.9375rem;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr repeat(3, 1fr);
  gap: var(--space-12);
}
@media (max-width: 760px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
.footer__col h4 {
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text);
  margin-bottom: var(--space-4);
}
.footer__col ul { list-style: none; padding: 0; margin: 0; display: grid; gap: var(--space-3); }
.footer__col a { color: var(--color-text-muted); }
.footer__col a:hover { color: var(--color-text); }
.footer__about p { margin-top: var(--space-4); max-width: 22rem; }
.footer__bottom {
  margin-top: var(--space-12);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-4);
  color: var(--color-text-muted);
  font-size: 0.875rem;
}
.footer__social a {
  color: var(--color-text-muted);
  margin-left: var(--space-4);
}
.footer__social a:first-child { margin-left: 0; }
.footer__social a:hover { color: var(--color-text); }

/* Visually flag fields that still hold placeholder content.
   Remove the [data-placeholder] attribute once you've inserted the real value. */
[data-placeholder] {
  background: rgba(234, 88, 12, 0.12);
  color: #B45309;
  padding: 0 0.25rem;
  border-radius: 3px;
  font-style: italic;
}

/* ============================================================
   INNER PAGE COMPONENTS
   Used by services.html, about.html, contact.html
   ============================================================ */

/* ----- Subnav (Services page anchor links) ----- */
.subnav {
  border-bottom: 1px solid var(--color-border);
}
.subnav__inner {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-6);
  padding: var(--space-5, 1.25rem) 0;
}
.subnav a {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  font-weight: 500;
  transition: color 140ms var(--ease);
}
.subnav a:hover { color: var(--color-text); }

/* ----- Service detail section ----- */
.service-section {
  padding: var(--space-24) 0;
}
.service-section + .service-section { border-top: 1px solid var(--color-border); }
.service-section__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-16);
  align-items: start;
}
@media (max-width: 900px) {
  .service-section__inner { grid-template-columns: 1fr; gap: var(--space-10, 2.5rem); }
}
.service-section__num {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-accent);
  letter-spacing: 0.08em;
  margin-bottom: var(--space-4);
  text-transform: uppercase;
}
.service-section h2 {
  font-size: clamp(1.75rem, 2.4vw + 0.5rem, 2.5rem);
  margin-bottom: var(--space-4);
}
.service-section p { font-size: 1.0625rem; line-height: 1.65; color: var(--color-text); }

.deliverables, .tools {
  list-style: none;
  padding: 0;
  margin: 0;
}
.deliverables { display: grid; gap: var(--space-3); }
.deliverables li {
  position: relative;
  padding-left: var(--space-6);
  font-size: 0.9375rem;
  line-height: 1.55;
  color: var(--color-text);
}
.deliverables li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.7em;
  width: 12px;
  height: 1.5px;
  background: var(--color-text);
}

.subhead {
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  margin: var(--space-8) 0 var(--space-4);
}
.tools { display: flex; flex-wrap: wrap; gap: var(--space-2); }
.tools li {
  display: inline-flex;
  align-items: center;
  padding: 0.4rem 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  font-size: 0.8125rem;
  color: var(--color-text);
  background: var(--color-bg);
}

/* ----- About: long-form story ----- */
.story {
  max-width: 42rem;
}
.story p {
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--color-text);
  margin-bottom: var(--space-5, 1.25rem);
}
.story p + p { margin-top: 0; }
.story h2 {
  font-size: 1.5rem;
  margin-top: var(--space-12);
  margin-bottom: var(--space-4);
}
.story h2:first-child { margin-top: 0; }
.story ul {
  margin: 0 0 var(--space-5, 1.25rem);
  padding-left: var(--space-6);
  color: var(--color-text);
  font-size: 1.0625rem;
  line-height: 1.65;
}
.story ul li { margin-bottom: var(--space-2); }
.story a {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}
.story a:hover { color: var(--color-accent-hover); }

/* ----- About: founder bio block ----- */
.bio {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: var(--space-12);
  align-items: start;
  max-width: 760px;
}
@media (max-width: 700px) {
  .bio { grid-template-columns: 1fr; gap: var(--space-6); }
}
.bio__avatar {
  width: 180px;
  height: 180px;
  background: var(--color-bg-subtle);
  border: 1px solid var(--color-border);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3.25rem;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.04em;
}
.bio__name {
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin: 0 0 var(--space-1);
}
.bio__role {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
}
.bio p { font-size: 1rem; line-height: 1.65; }

/* ----- Contact: form + details grid ----- */
.contact-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: var(--space-16);
  align-items: start;
}
@media (max-width: 900px) {
  .contact-grid { grid-template-columns: 1fr; gap: var(--space-12); }
}

.contact-form { display: grid; gap: var(--space-5, 1.25rem); }
.contact-form .field { display: grid; gap: var(--space-2); }
.contact-form label {
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text);
}
.contact-form input,
.contact-form textarea {
  width: 100%;
  padding: 0.85rem 1rem;
  font: inherit;
  font-size: 0.9375rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-bg);
  color: var(--color-text);
  transition: border-color 140ms var(--ease);
}
.contact-form input:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--color-text);
}
.contact-form textarea { resize: vertical; min-height: 140px; }
.contact-form .actions { margin-top: var(--space-2); }

.contact-details > div + div { margin-top: var(--space-10, 2.5rem); }

/* ----- Email block with click-to-copy ----- */
.email-block {
  display: flex;
  align-items: stretch;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--color-bg);
  transition: border-color 140ms var(--ease);
}
.email-block:hover { border-color: var(--color-text); }
.email-block__link {
  flex: 1;
  display: flex;
  align-items: center;
  padding: 0.85rem 1rem;
  font-size: 0.9375rem;
  color: var(--color-text);
  text-decoration: none;
  word-break: break-all;
}
.email-block__link:hover { text-decoration: underline; }
.copy-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 78px;
  padding: 0 1rem;
  border-left: 1px solid var(--color-border);
  background: var(--color-bg-subtle);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-text);
  cursor: pointer;
  transition: background 140ms var(--ease), color 140ms var(--ease);
}
.copy-btn:hover { background: var(--color-text); color: var(--color-bg); }
.copy-btn.is-copied {
  background: var(--color-text);
  color: var(--color-bg);
}
.copy-btn.is-copied .copy-btn__label::before {
  content: '✓ ';
}
.contact-details h3 {
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin: 0 0 var(--space-3);
  color: var(--color-text);
}
.contact-details p { font-size: 1rem; color: var(--color-text); margin: 0; line-height: 1.6; }
.contact-details a { color: var(--color-text); }
.contact-details a:hover { text-decoration: underline; }

.expect {
  list-style: none;
  counter-reset: expect;
  padding: 0;
  margin: 0;
  display: grid;
  gap: var(--space-5, 1.25rem);
}
.expect li {
  counter-increment: expect;
  position: relative;
  padding-left: var(--space-10, 2.5rem);
  font-size: 0.9375rem;
  line-height: 1.55;
  color: var(--color-text);
}
.expect li::before {
  content: counter(expect, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: 0.06em;
}

/* ----- Reveal on scroll ----- */
.reveal {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 600ms var(--ease), transform 600ms var(--ease);
}
.reveal.is-visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}