/* =========================================================
   Epinmart — design tokens
   Single source of truth for brand colours, type & spacing.
   ========================================================= */
:root {
  /* Brand palette (placeholder — confirm against brand assets) */
  --color-brand: #0b6b3a;          /* deep green */
  --color-brand-dark: #084f2b;
  --color-brand-light: #e8f3ec;
  --color-accent: #f0a323;         /* warm gold */

  --color-text: #1b2421;
  --color-muted: #5a6b63;
  --color-bg: #ffffff;
  --color-bg-alt: #f6f8f7;
  --color-border: #dfe6e2;

  /* Typography */
  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --fs-base: 1rem;
  --fs-sm: 0.875rem;
  --fs-lg: 1.25rem;
  --fs-h1: clamp(2rem, 5vw, 3.25rem);
  --fs-h2: clamp(1.5rem, 3.5vw, 2.25rem);
  --lh-base: 1.6;
  --lh-tight: 1.2;

  /* Spacing scale */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2rem;
  --space-6: 3rem;
  --space-7: 5rem;

  /* Layout */
  --container-max: 72rem;
  --radius: 0.5rem;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.08), 0 4px 16px rgba(0, 0, 0, 0.06);
}

/* =========================================================
   Reset / base
   ========================================================= */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  line-height: var(--lh-base);
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 {
  line-height: var(--lh-tight);
  margin: 0 0 var(--space-3);
}
h1 { font-size: var(--fs-h1); }
h2 { font-size: var(--fs-h2); }

p { margin: 0 0 var(--space-3); }

a {
  color: var(--color-brand);
  text-decoration: none;
}
a:hover,
a:focus { text-decoration: underline; }

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

:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}

/* =========================================================
   Layout helpers
   ========================================================= */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--space-4);
}

.section {
  padding-block: var(--space-7);
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--color-brand);
  color: #fff;
  padding: var(--space-2) var(--space-3);
  z-index: 100;
}
.skip-link:focus {
  left: var(--space-3);
  top: var(--space-3);
}

/* =========================================================
   Buttons
   ========================================================= */
.btn {
  display: inline-block;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius);
  font-weight: 600;
  border: 2px solid transparent;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease;
}
.btn:hover,
.btn:focus { text-decoration: none; }

.btn--primary {
  background: var(--color-brand);
  color: #fff;
}
.btn--primary:hover,
.btn--primary:focus { background: var(--color-brand-dark); }

.btn--ghost {
  border-color: var(--color-brand);
  color: var(--color-brand);
}
.btn--ghost:hover,
.btn--ghost:focus { background: var(--color-brand-light); }

/* =========================================================
   Header / navigation
   ========================================================= */
.site-header {
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg);
  position: sticky;
  top: 0;
  z-index: 50;
}
.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 4rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-text);
  font-weight: 700;
}
.brand:hover { text-decoration: none; }
.brand__mark {
  width: 2.5rem;
  height: 2.5rem;
  display: block;
}
.brand__name { font-size: var(--fs-lg); }

.nav-toggle {
  display: inline-flex;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: 0;
  padding: var(--space-2);
  cursor: pointer;
}
.nav-toggle__bar {
  width: 24px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
}

.primary-nav { display: none; }
.primary-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
}
.primary-nav a {
  color: var(--color-text);
  font-weight: 500;
}
.primary-nav a[aria-current="page"] { color: var(--color-brand); }

/* Mobile nav open state */
.primary-nav.is-open {
  display: block;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-4);
  box-shadow: var(--shadow);
}
.primary-nav.is-open ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.nav-cta { margin-top: var(--space-3); display: inline-block; }

/* Desktop — wider breakpoint so the 7-item nav has room (otherwise mobile menu) */
@media (min-width: 64rem) {
  .nav-toggle { display: none; }
  .primary-nav {
    display: flex;
    align-items: center;
    gap: var(--space-4);
  }
  .primary-nav ul {
    display: flex;
    gap: var(--space-4);
  }
  .nav-cta { margin-top: 0; white-space: nowrap; }
}

/* =========================================================
   Hero (home placeholder)
   ========================================================= */
.hero {
  background: var(--color-brand-light);
}
.hero__inner {
  display: grid;
  gap: var(--space-4);
  text-align: center;
  padding-block: var(--space-7);
}
.hero p { color: var(--color-muted); font-size: var(--fs-lg); max-width: 42rem; margin-inline: auto; }
.hero__actions {
  display: flex;
  gap: var(--space-3);
  justify-content: center;
  flex-wrap: wrap;
}

.lede { font-size: var(--fs-lg); color: var(--color-muted); }

/* =========================================================
   Footer
   ========================================================= */
.site-footer {
  margin-top: var(--space-7);
  background: var(--color-brand-dark);
  color: #d7e5dd;
}
.site-footer a { color: #fff; }
.site-footer__inner {
  display: grid;
  gap: var(--space-5);
  padding-block: var(--space-6);
}
.site-footer__heading {
  font-size: var(--fs-sm);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #fff;
  margin-bottom: var(--space-2);
}
.site-footer ul { list-style: none; margin: 0; padding: 0; display: grid; gap: var(--space-2); }
.site-footer__legal {
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  padding-block: var(--space-3);
  font-size: var(--fs-sm);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-4);
  justify-content: space-between;
}
.site-footer__legal p { margin: 0; }

@media (min-width: 48rem) {
  .site-footer__inner {
    grid-template-columns: 2fr 1fr 1fr;
  }
}

/* =========================================================
   Phase 1 — content components
   ========================================================= */

/* Section variants */
.section--alt { background: var(--color-bg-alt); }
.section--brand {
  background: var(--color-brand);
  color: #fff;
}
.section--brand h2 { color: #fff; }
.section--brand p { color: rgba(255, 255, 255, 0.9); }

.section__title {
  text-align: center;
  margin-bottom: var(--space-5);
}

.narrow { max-width: 48rem; }
.center { text-align: center; }
.muted { color: var(--color-muted); }

/* Page header band */
.page-head {
  background: var(--color-brand-light);
  padding-block: var(--space-6);
}
.page-head .lede { margin-bottom: 0; }

/* Cards */
.cards {
  display: grid;
  gap: var(--space-4);
}
.card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-4);
  box-shadow: var(--shadow);
}
.card h3 { margin-top: 0; }
.card p:last-child { margin-bottom: 0; }

@media (min-width: 48rem) {
  .cards { grid-template-columns: repeat(3, 1fr); }
}

/* Steps */
.steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-4);
  counter-reset: step;
}
.step {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-4);
}
.step h3 { margin: var(--space-2) 0; }
.step p:last-child { margin-bottom: 0; }
.step__num {
  display: grid;
  place-items: center;
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 50%;
  background: var(--color-brand);
  color: #fff;
  font-weight: 700;
}
.steps + .center { margin-top: var(--space-5); }

@media (min-width: 48rem) {
  .steps { grid-template-columns: repeat(3, 1fr); }
  .steps--vertical { grid-template-columns: 1fr; max-width: 48rem; margin-inline: auto; }
  .steps--vertical .step { display: grid; grid-template-columns: auto 1fr; column-gap: var(--space-4); }
  .steps--vertical .step__num { grid-row: span 2; }
  .steps--vertical .step h3 { margin-top: 0; }
}

/* Gateway diagram */
.diagram {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}
.diagram__col--stack {
  display: grid;
  gap: var(--space-2);
}
.diagram__arrow {
  font-size: var(--fs-h2);
  color: var(--color-brand);
  transform: rotate(90deg);
}
.node {
  display: inline-grid;
  place-items: center;
  text-align: center;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius);
  border: 2px solid var(--color-border);
  background: var(--color-bg);
  font-weight: 600;
  min-width: 9rem;
}
.node--gateway {
  border-color: var(--color-brand);
  background: var(--color-brand);
  color: #fff;
}
.node--inst { border-color: var(--color-accent); }

@media (min-width: 48rem) {
  .diagram { flex-direction: row; justify-content: center; }
  .diagram__arrow { transform: none; }
}

/* Stats */
.stat {
  font-size: clamp(2.5rem, 8vw, 4rem);
  font-weight: 800;
  line-height: 1;
  margin: 0;
}
.stat__label {
  font-size: var(--fs-lg);
  margin: var(--space-2) 0 var(--space-4);
}

/* Forms */
.contact-grid {
  display: grid;
  gap: var(--space-6);
}
.form__row {
  display: grid;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}
.form label { font-weight: 600; }
.form input,
.form textarea {
  font: inherit;
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-bg);
}
.form input:focus,
.form textarea:focus {
  outline: 3px solid var(--color-accent);
  outline-offset: 1px;
}
.contact-aside h2 { font-size: var(--fs-lg); }

@media (min-width: 48rem) {
  .contact-grid { grid-template-columns: 2fr 1fr; align-items: start; }
}

/* =========================================================
   Phase 2 — service & case study
   ========================================================= */

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: var(--fs-sm);
  font-weight: 700;
  color: var(--color-brand);
  margin-bottom: var(--space-2);
}

/* Exam body cards */
.body-card { text-align: center; }
.body-card__abbr {
  display: inline-grid;
  place-items: center;
  min-width: 4rem;
  padding: var(--space-2) var(--space-3);
  margin-bottom: var(--space-3);
  border-radius: var(--radius);
  background: var(--color-brand-light);
  color: var(--color-brand-dark);
  font-weight: 800;
  letter-spacing: 0.03em;
}
.body-card h3 { margin-bottom: var(--space-2); }

/* Case study stat grid */
.stat-grid {
  display: grid;
  gap: var(--space-5);
  text-align: center;
}
.stat-block .stat { color: var(--color-brand); }
.stat-block .stat__label { margin: var(--space-2) 0 0; color: var(--color-muted); }

@media (min-width: 48rem) {
  .stat-grid { grid-template-columns: repeat(3, 1fr); }
}

/* =========================================================
   Phase 3 — developer / API section
   ========================================================= */

.note {
  border-left: 4px solid var(--color-accent);
  background: var(--color-bg-alt);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius);
}

.code {
  background: #0d1f17;
  color: #e6f1ea;
  padding: var(--space-4);
  border-radius: var(--radius);
  overflow-x: auto;          /* never break the page layout on narrow screens */
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: var(--fs-sm);
  line-height: 1.5;
}
.code code {
  font-family: inherit;
  white-space: pre;
}
.section--alt .code,
.section .code { margin-bottom: var(--space-4); }