/* ═══════════════════════════════════════════════════════════
   STRATUM BRIDGE — Stylesheet
   Palette: near-black / off-white / warm grey
   Typography: Cormorant Garamond (display) / EB Garamond (body)
               Josefin Sans (labels / metadata)
   ═══════════════════════════════════════════════════════════ */

/* ── Reset & base ─────────────────────────────────────────── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --ink:        #111010;
  --ink-mid:    #3a3836;
  --ink-light:  #7a7571;
  --paper:      #f2efe9;
  --paper-warm: #e8e3da;
  --paper-dark: #d6d0c6;
  --reverse:    #1a1917;
  --reverse-mid:#2e2c29;
  --accent:     #8a7c6e;
  --rule:       rgba(0,0,0,0.12);
  --rule-light: rgba(255,255,255,0.1);

  --font-display: 'Cormorant Garamond', Georgia, serif;
  --font-body:    'EB Garamond', Georgia, serif;
  --font-label:   'Josefin Sans', 'Gill Sans', sans-serif;

  --max-w: 860px;
  --gutter: 2rem;
  --section-pad: 8rem;
}

html {
  scroll-behavior: smooth;
  font-size: 18px;
}

body {
  background-color: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ── Utility: container ────────────────────────────────────── */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: grid;
  grid-template-columns: 11rem 1fr;
  gap: 0 3rem;
  align-items: start;
}

/* ── Sections ──────────────────────────────────────────────── */
.section {
  padding: var(--section-pad) 0;
  border-top: 1px solid var(--rule);
}

.section--dark {
  background-color: var(--reverse);
  color: var(--paper);
  border-top: none;
}

.section--dark .section-title {
  color: var(--paper);
}

.section--ruled {
  background-color: var(--paper-warm);
}

.section--contact {
  background-color: var(--paper);
}

/* ── Section labels (left column) ─────────────────────────── */
.section-label {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  padding-top: 0.35rem;
}

.label-num {
  font-family: var(--font-label);
  font-size: 0.6rem;
  letter-spacing: 0.18em;
  color: var(--ink-light);
  font-weight: 300;
}

.label-text {
  font-family: var(--font-label);
  font-size: 0.6rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-light);
  font-weight: 300;
}

.section-label--light .label-num,
.section-label--light .label-text {
  color: var(--accent);
}

/* ── Section headings ──────────────────────────────────────── */
.section-title {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(1.6rem, 3.5vw, 2.4rem);
  line-height: 1.2;
  letter-spacing: 0.01em;
  color: var(--ink);
  margin-bottom: 2.5rem;
}

/* ── Body text ─────────────────────────────────────────────── */
.body-text p {
  font-family: var(--font-body);
  font-size: 1.05rem;
  line-height: 1.85;
  color: var(--ink-mid);
  margin-bottom: 1.4rem;
}

.body-text p:last-child {
  margin-bottom: 0;
}

.standout {
  font-family: var(--font-display) !important;
  font-style: italic;
  font-size: 1.2rem !important;
  line-height: 1.7 !important;
  color: var(--ink) !important;
  border-left: 1px solid var(--accent);
  padding-left: 1.5rem;
  margin-top: 2rem !important;
}

/* ── HERO ──────────────────────────────────────────────────── */
.hero {
  min-height: 100svh;
  display: flex;
  align-items: center;
  background-color: var(--paper);
  padding: 5rem var(--gutter) 6rem;
}

.hero-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  width: 100%;
  animation: heroFade 1.2s ease both;
}

@keyframes heroFade {
  from { opacity: 0; transform: translateY(14px); }
  to   { opacity: 1; transform: translateY(0); }
}

.hero-overline {
  font-family: var(--font-label);
  font-size: 0.6rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 300;
  margin-bottom: 2.5rem;
}

.hero-title {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(4rem, 12vw, 9rem);
  line-height: 0.92;
  letter-spacing: -0.01em;
  color: var(--ink);
  margin-bottom: 2.5rem;
}

.hero-subtitle {
  font-family: var(--font-label);
  font-size: 0.65rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-light);
  font-weight: 300;
  margin-bottom: 2.5rem;
}

.hero-rule {
  width: 3rem;
  height: 1px;
  background-color: var(--accent);
  margin-bottom: 2.5rem;
}

.hero-body {
  font-family: var(--font-body);
  font-size: 1.1rem;
  line-height: 1.8;
  color: var(--ink-mid);
  max-width: 36rem;
  margin-bottom: 3.5rem;
}

.cta-link {
  display: inline-block;
  font-family: var(--font-label);
  font-size: 0.65rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--ink);
  padding-bottom: 0.2rem;
  transition: color 0.25s, border-color 0.25s;
  font-weight: 300;
}

.cta-link:hover {
  color: var(--accent);
  border-color: var(--accent);
}

/* ── Logic chain ───────────────────────────────────────────── */
.logic-chain {
  list-style: none;
  margin-bottom: 3rem;
}

.logic-chain li {
  display: flex;
  align-items: baseline;
  gap: 1.4rem;
  padding: 1.1rem 0;
  border-bottom: 1px solid var(--rule-light);
}

.logic-chain li:first-child {
  border-top: 1px solid var(--rule-light);
}

.chain-index {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 0.85rem;
  color: var(--accent);
  min-width: 1.6rem;
  letter-spacing: 0.04em;
}

.chain-label {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 300;
  color: var(--paper);
  letter-spacing: 0.01em;
}

.logic-closing {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1.15rem;
  color: var(--accent);
  letter-spacing: 0.02em;
  margin-top: 0.5rem;
}

/* ── Focus list ─────────────────────────────────────────────── */
.focus-list {
  list-style: none;
}

.focus-list li {
  font-family: var(--font-body);
  font-size: 1.05rem;
  line-height: 1.6;
  color: var(--ink-mid);
  padding: 1rem 0;
  border-bottom: 1px solid var(--rule);
  padding-left: 1rem;
  position: relative;
}

.focus-list li:first-child {
  border-top: 1px solid var(--rule);
}

.focus-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 2px;
  height: 1rem;
  background-color: var(--paper-dark);
}

/* ── Principles ─────────────────────────────────────────────── */
.principles-list {
  display: flex;
  flex-direction: column;
}

.principle-item {
  display: grid;
  grid-template-columns: 1fr 1.6fr;
  gap: 1.5rem;
  padding: 1.4rem 0;
  border-bottom: 1px solid var(--rule);
  align-items: start;
}

.principle-item:first-child {
  border-top: 1px solid var(--rule);
}

.principle-item dt {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 500;
  color: var(--ink);
  letter-spacing: 0.01em;
  padding-top: 0.1rem;
}

.principle-item dd {
  font-family: var(--font-body);
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--ink-mid);
}

/* ── Contact ────────────────────────────────────────────────── */
.contact-body {
  font-family: var(--font-body);
  font-size: 1.1rem;
  line-height: 1.75;
  color: var(--ink-mid);
  margin-bottom: 2rem;
}

.contact-email {
  display: inline-block;
  font-family: var(--font-label);
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--accent);
  padding-bottom: 0.25rem;
  font-weight: 300;
  transition: color 0.25s, border-color 0.25s;
}

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

/* ── Footer ─────────────────────────────────────────────────── */
.footer {
  background-color: var(--reverse);
  padding: 2.5rem var(--gutter);
  text-align: center;
}

.footer p {
  font-family: var(--font-label);
  font-size: 0.58rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-light);
  font-weight: 300;
}

/* ── Responsive ─────────────────────────────────────────────── */
@media (max-width: 700px) {
  :root {
    --section-pad: 5rem;
    --gutter: 1.5rem;
  }

  .container {
    grid-template-columns: 1fr;
    gap: 1.5rem 0;
  }

  .section-label {
    flex-direction: row;
    align-items: center;
    gap: 0.8rem;
    padding-top: 0;
  }

  .hero-title {
    font-size: clamp(3.5rem, 18vw, 6rem);
  }

  .principle-item {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }

  .chain-label {
    font-size: 1.1rem;
  }
}

@media (max-width: 480px) {
  :root {
    --gutter: 1.2rem;
    --section-pad: 4rem;
  }

  .hero {
    min-height: 95svh;
    align-items: flex-end;
    padding-bottom: 4rem;
  }

  .hero-title {
    font-size: clamp(3rem, 19vw, 5rem);
  }

  .focus-list li {
    font-size: 0.97rem;
  }
}