:root {
  --bg: #0E1822;
  --bg-elevated: #152132;
  --text-primary: #E8ECF2;
  --text-secondary: #8A96A6;
  --text-muted: #5C6877;
  --accent: #D98746;
  --accent-dim: #8B5A32;
  --border: #24314A;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 2.5rem;
  --space-8: 3rem;
  --space-9: 4rem;

  --radius: 8px;
  --radius-sm: 6px;
}

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text-primary);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  font-size: 15px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: inherit;
  text-decoration: none;
}

/* Layout container (mobile-first) */
.container {
  max-width: 420px;
  margin: 0 auto;
  padding: 1.75rem 1.75rem 2rem;
}

.page-main .container {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
  padding-top: 3rem;
}

/* Section primitives */
.section {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.eyebrow {
  font-size: 11px;
  letter-spacing: 1.5px;
  font-weight: 500;
  color: var(--text-muted);
  margin: 0;
  text-transform: uppercase;
}

.eyebrow--accent {
  color: var(--accent);
  font-weight: 600;
}

.hero {
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
}

.status-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 11px;
  letter-spacing: 1.5px;
  font-weight: 500;
  color: var(--text-secondary);
  text-transform: uppercase;
}

.status-tag::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
}

.hero__intro {
  margin: 0;
  font-size: 1.5rem;
  line-height: 1.35;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--text-primary);
}

.hero__support {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.55;
  color: var(--text-secondary);
}

.page-title {
  margin: 0;
  font-size: 1.75rem;
  line-height: 1.25;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.page-lede {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.6;
  color: var(--text-secondary);
  max-width: 45ch;
}

/* Back link */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.625rem 1rem 0.625rem 0.875rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 500;
  color: var(--text-primary);
  letter-spacing: 0.01em;
  transition: border-color 0.15s ease, background 0.15s ease;
  align-self: flex-start;
}

.back-link:hover,
.back-link:focus-visible {
  border-color: var(--accent);
  background: #1A2840;
}

.back-link .icon {
  color: var(--accent);
}

/* Service nav (main page) */
.service-nav {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.service-nav__label {
  margin-bottom: 1rem;
}

.service-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 1rem 0;
  border-top: 1px solid var(--border);
  transition: padding 0.15s ease;
}

.service-nav .service-link:last-child {
  border-bottom: 1px solid var(--border);
}

.service-link:hover,
.service-link:focus-visible {
  padding-left: 0.25rem;
  padding-right: 0.25rem;
}

.service-link__title {
  margin: 0 0 0.25rem 0;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.service-link__sub {
  margin: 0;
  font-size: 0.8125rem;
  color: var(--text-secondary);
}

.service-link__index {
  display: none;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--accent);
  font-weight: 600;
}

.service-link__arrow {
  color: var(--accent);
  flex-shrink: 0;
}

/* Problems (numbered list) */
.problems {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.problem-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
}

.problem {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1rem 0;
  border-top: 1px solid var(--border);
}

.problem-grid > .problem:last-child {
  border-bottom: 1px solid var(--border);
}

.problem__num {
  font-size: 13px;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.08em;
  flex-shrink: 0;
}

.problem__text {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.5;
  color: var(--text-primary);
}

/* Process steps (How I work — icon + text) */
.steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.step {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
}

.step .icon {
  color: var(--accent);
  flex-shrink: 0;
  margin-top: 2px;
}

.step__text {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.5;
  color: var(--text-primary);
}

/* Cards (generic) */
.cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.card--link {
  transition: border-color 0.15s ease, transform 0.15s ease;
}

.card--link:hover,
.card--link:focus-visible {
  border-color: var(--accent);
}

.card__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.card__index {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--accent);
  font-weight: 600;
}

.card__icon {
  color: var(--accent);
}

.card__title {
  margin: 0;
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--text-primary);
}

.card__text {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.55;
  color: var(--text-secondary);
}

.card__arrow {
  color: var(--accent);
}

/* Work blocks (Data page) */
.work-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
}

.work-item {
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
  padding: 1rem 0;
  border-top: 1px solid var(--border);
}

.work-list > .work-item:last-child {
  border-bottom: 1px solid var(--border);
}

.work-item__title {
  margin: 0;
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--text-primary);
}

.work-item__text {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.55;
  color: var(--text-secondary);
}

/* Metrics */
.metrics {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.metric {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.metric__value {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent);
}

.metric__label {
  margin: 0;
  font-size: 0.8125rem;
  line-height: 1.4;
  color: var(--text-secondary);
}

.metric__divider {
  display: none;
  width: 1px;
  background: var(--border);
  align-self: stretch;
}

/* Approach block */
.approach {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.approach__title {
  margin: 0;
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
}

.approach__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.625rem;
}

.approach__item {
  display: flex;
  align-items: flex-start;
  gap: 0.625rem;
  font-size: 0.875rem;
  line-height: 1.5;
  color: var(--text-primary);
}

.approach__item::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  flex-shrink: 0;
  margin-top: 0.5rem;
}

/* Callout (Not what I do) */
.callout {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.callout__label {
  margin: 0;
  font-size: 11px;
  letter-spacing: 1.5px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
}

.callout__text {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.6;
  color: var(--text-secondary);
}

/* Footer */
.site-footer {
  margin-top: 1.75rem;
  padding-top: 1.75rem;
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.site-footer__label {
  margin: 0;
  font-size: 11px;
  letter-spacing: 1.5px;
  font-weight: 500;
  color: var(--text-muted);
  text-transform: uppercase;
}

.contact-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.contact-list a {
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
  font-size: 0.875rem;
  color: var(--text-primary);
}

.contact-list a:hover,
.contact-list a:focus-visible {
  color: var(--accent);
}

.contact-list .icon {
  color: var(--accent);
  flex-shrink: 0;
}

.icon {
  width: 16px;
  height: 16px;
  stroke: currentColor;
  fill: none;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  display: inline-block;
  flex-shrink: 0;
}

.icon--lg {
  width: 20px;
  height: 20px;
}

/* Page scaffolding for non-main pages */
.page-stack {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

/* =====================================================
   Tablet: ~768px+
   ===================================================== */
@media (min-width: 768px) {
  .container {
    max-width: 760px;
    padding: 2.5rem 2.5rem 3rem;
  }

  .page-main .container {
    padding-top: 4rem;
    gap: 3.5rem;
  }

  .hero__intro {
    font-size: 2rem;
  }

  .page-title {
    font-size: 2.25rem;
  }

  .hero__support,
  .page-lede {
    font-size: 1rem;
  }

  /* Service links become cards side by side */
  .service-nav {
    gap: 1rem;
  }

  .service-nav__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
  }

  .service-nav__grid .service-link {
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-start;
    gap: 0.75rem;
    padding: 1.25rem;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-top: 1px solid var(--border);
    border-radius: var(--radius);
  }

  .service-nav__grid .service-link:last-child {
    border-bottom: 1px solid var(--border);
  }

  .service-nav__grid .service-link:hover,
  .service-nav__grid .service-link:focus-visible {
    border-color: var(--accent);
    padding: 1.25rem;
  }

  .service-nav__grid .service-link__head {
    display: flex;
    width: 100%;
    justify-content: space-between;
    align-items: center;
  }

  .service-nav__grid .service-link__index {
    display: inline;
  }

  .service-nav__grid .service-link__arrow-mobile {
    display: none;
  }

  /* Problems split into 2 columns */
  .problem-grid {
    grid-template-columns: 1fr 1fr;
    column-gap: 1.5rem;
  }

  .problem-grid .problem {
    border-top: 1px solid var(--border);
  }

  .problem-grid .problem:nth-last-child(-n + 2) {
    border-bottom: 1px solid var(--border);
  }

  .problem-grid > .problem:last-child {
    border-bottom: 1px solid var(--border);
  }

  /* Steps horizontal */
  .steps {
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
  }

  .step {
    flex-direction: column;
    gap: 0.75rem;
    padding: 1.25rem;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius);
  }

  .step .icon {
    margin-top: 0;
  }

  /* Cards 2 per row on tablet */
  .cards {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.25rem;
  }

  /* Work list as horizontal cards */
  .work-list {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.25rem;
  }

  .work-list .work-item {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--bg-elevated);
    padding: 1.5rem;
    gap: 0.5rem;
  }

  .work-list > .work-item:last-child,
  .work-list .work-item {
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
  }

  /* Metrics horizontal */
  .metrics {
    flex-direction: row;
    align-items: center;
    gap: 1.5rem;
    padding: 1.75rem;
  }

  .metric {
    flex: 1;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }

  .metric__value {
    font-size: 2rem;
  }

  .metric__divider {
    display: block;
  }

  /* Approach: 2 columns */
  .approach {
    padding: 1.75rem;
  }

  .approach__list {
    grid-template-columns: 1fr 1fr;
    column-gap: 2rem;
    row-gap: 0.75rem;
  }

  /* Callout: width-limited and centered */
  .callout {
    max-width: 640px;
    margin-left: auto;
    margin-right: auto;
    width: 100%;
  }

  /* Scope grid (DevOps) 2 columns */
  .cards--scope {
    grid-template-columns: repeat(2, 1fr);
  }

  /* Contact list horizontal */
  .contact-list {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 1.5rem;
  }
}

/* =====================================================
   Desktop: ~1024px+
   ===================================================== */
@media (min-width: 1024px) {
  .container {
    max-width: 1100px;
    padding: 3.5rem 4rem 3rem;
  }

  .page-main .container {
    padding-top: 4.5rem;
    gap: 4rem;
  }

  .hero__intro {
    font-size: 2.5rem;
    max-width: 22ch;
  }

  .page-title {
    font-size: 2.75rem;
  }

  .hero__support {
    font-size: 1.125rem;
  }

  .page-lede {
    font-size: 1.125rem;
  }

  /* Problem list stays at 2 columns on desktop (per brief) */
  .problem-grid {
    column-gap: 2rem;
  }

  /* Work list stays 3 columns */
  .work-list {
    gap: 1.5rem;
  }

  /* Cards: 3 per row on desktop where appropriate */
  .cards--scope {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
  }

  /* Approach: keep 2 columns (content is paired) */
  .approach {
    padding: 2rem;
  }
}