/* ─── Reset & Base ─────────────────────────────────────────────────────────── */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --color-bg:        #FAFAF7;
  --color-bg-tint:   #F3F3EE;
  --color-text:      #1A1A1A;
  --color-secondary: #555555;
  --color-accent:    #0F2942;
  --color-accent-dk: #0a1f33;
  --color-border:    #E4E4DF;

  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-serif: 'Fraunces', Georgia, serif;

  --max-width: 720px;
  --max-width-narrow: 580px;

  --section-gap: 128px;
  --container-px: 24px;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}

body {
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 1.125rem;
  line-height: 1.7;
}

/* ─── Typography ────────────────────────────────────────────────────────────── */

h1, h2, h3 {
  line-height: 1.15;
}

p {
  color: var(--color-secondary);
}

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

/* ─── Layout Primitives ─────────────────────────────────────────────────────── */

.container {
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--container-px);
}

.container--narrow {
  max-width: var(--max-width-narrow);
}

/* ─── Wordmark ──────────────────────────────────────────────────────────────── */

.wordmark {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent);
}

/* ─── CTA Button ────────────────────────────────────────────────────────────── */

.btn {
  display: inline-block;
  background-color: var(--color-accent);
  color: #fff;
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  padding: 1.125rem 2rem;
  border-radius: 7px;
  transition: background-color 0.15s ease;
  margin-top: 2.5rem;
}

.btn:hover,
.btn:focus-visible {
  background-color: var(--color-accent-dk);
  outline: none;
}

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

/* ─── Site Header ───────────────────────────────────────────────────────────── */

.site-header {
  padding-block: 28px;
  border-bottom: 1px solid var(--color-border);
  background-color: var(--color-bg);
}

/* ─── Hero ──────────────────────────────────────────────────────────────────── */

.hero {
  padding-block: var(--section-gap);
  background: linear-gradient(to bottom, #F5F4EF 0%, var(--color-bg) 100%);
}

.hero-eyebrow {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 1.375rem;
}

.hero-headline {
  font-family: var(--font-serif);
  font-size: clamp(2.25rem, 6vw, 4rem);
  font-weight: 400;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--color-text);
  max-width: 660px;
}

.hero-sub {
  margin-top: 1.75rem;
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--color-secondary);
  max-width: 540px;
}

/* ─── Sections ──────────────────────────────────────────────────────────────── */

.section {
  padding-block: var(--section-gap);
  position: relative;
}

/* Accent dot divider — sits in the top padding of each section */
.section::before {
  content: '';
  position: absolute;
  top: calc(var(--section-gap) / 2 - 4px);
  left: 50%;
  transform: translateX(-50%);
  width: 8px;
  height: 8px;
  background-color: var(--color-accent);
  border-radius: 50%;
  opacity: 0.35;
}

.section--accent-bg {
  background-color: var(--color-bg-tint);
}

.section-heading {
  font-family: var(--font-sans);
  font-size: clamp(1.75rem, 3.75vw, 2.375rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--color-text);
  margin-bottom: 2rem;
  line-height: 1.15;
}

.section-intro {
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--color-secondary);
  max-width: 580px;
  margin-bottom: 3.5rem;
}

/* ─── Prose (paragraph groups) ─────────────────────────────────────────────── */

.prose p {
  font-size: 1.125rem;
  line-height: 1.75;
  color: var(--color-secondary);
  max-width: 640px;
}

.prose p + p {
  margin-top: 1.5rem;
}

/* ─── Problem Diagram ───────────────────────────────────────────────────────── */

.problem-diagram {
  margin-block: 3rem;
}

.diagram-panels {
  display: flex;
  align-items: center;
  gap: 0;
}

.diagram-panel {
  flex: 1;
  min-width: 0;
}

.diagram-panel svg {
  display: block;
  width: 100%;
  height: auto;
}

.diagram-arrow {
  flex: 0 0 40px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.diagram-caption {
  font-style: italic;
  font-size: 0.875rem;
  color: var(--color-secondary);
  text-align: center;
  margin-top: 1.25rem;
  opacity: 0.8;
}

/* ─── Services Grid ─────────────────────────────────────────────────────────── */

.services-grid {
  display: grid;
  gap: 0;
}

.service-item {
  padding-top: 2rem;
  padding-bottom: 2rem;
  border-top: 1px solid var(--color-border);
}

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

.service-num {
  display: block;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  margin-bottom: 0.625rem;
  opacity: 0.7;
}

.service-heading {
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text);
  margin-bottom: 0.75rem;
}

.service-item p {
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-secondary);
  max-width: 600px;
}

/* ─── Footer ────────────────────────────────────────────────────────────────── */

.site-footer {
  border-top: 1px solid var(--color-border);
  padding-block: 40px;
  background-color: var(--color-bg);
}

.footer-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.footer-email {
  font-size: 0.9375rem;
  color: var(--color-secondary);
  transition: color 0.15s ease;
}

.footer-email:hover {
  color: var(--color-accent);
}

.footer-copy {
  margin-top: 1.25rem;
  text-align: center;
  font-size: 0.8125rem;
  color: #999;
}

/* ─── Responsive ────────────────────────────────────────────────────────────── */

@media (max-width: 600px) {
  :root {
    --section-gap: 80px;
    --container-px: 20px;
  }

  .hero-headline {
    font-size: clamp(2.25rem, 9vw, 2.75rem);
  }

  .hero-sub {
    font-size: 1.0625rem;
  }

  .section-heading {
    font-size: clamp(1.625rem, 6vw, 2rem);
  }

  .btn {
    padding: 1rem 1.625rem;
    font-size: 0.9375rem;
  }

  .footer-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }

  /* Diagram: stack panels vertically on mobile */
  .diagram-panels {
    flex-direction: column;
    align-items: stretch;
    gap: 1rem;
  }

  .diagram-arrow {
    justify-content: center;
  }

  .diagram-arrow svg {
    transform: rotate(90deg);
  }
}