/* ============================================================
 *  NORTHSLINE — Editorial / Apple-prime
 *  Clean. Generous. Confident. Minimal.
 *  Type: Instrument Serif (display) + Instrument Sans (body)
 * ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Instrument+Sans:ital,wght@0,400..700;1,400..700&family=Instrument+Serif:ital@0;1&display=swap');

:root {
  --color-bone:    #f5f5f3;
  --color-paper:   #fbfbf9;
  --color-ink:     #1d1d1f;
  --color-vellum:  #e2e2de;
  --color-graphite: #6e6e73;
  --color-ash:     #86868b;

  --font-title: 'Instrument Serif', serif;
  --font-body:  'Instrument Sans', sans-serif;

  --spacing-12: 12px;
  --spacing-16: 16px;
  --spacing-20: 20px;
  --spacing-28: 28px;
  --spacing-40: 40px;
  --spacing-60: 60px;
  --spacing-80: 80px;
  --spacing-100: 100px;
  --spacing-120: 120px;
  --spacing-160: 160px;

  --radius-cards: 12px;
  --radius-buttons: 980px;

  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --max-width: 1080px;
  --reading-width: 720px;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  background-color: var(--color-bone);
  color: var(--color-ink);
  font-family: var(--font-body);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  line-height: 1.5;
  letter-spacing: -0.003em;
}

/* ============================================================
 *  FOCUS
 * ============================================================ */
:focus-visible {
  outline: 2px solid var(--color-ink);
  outline-offset: 3px;
  border-radius: 2px;
}
.navbar-link:focus-visible,
.btn-pill:focus-visible {
  outline: 2px solid var(--color-ink);
  outline-offset: 4px;
  border-radius: 4px;
}

.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--color-ink);
  color: var(--color-bone);
  padding: 8px 16px;
  z-index: 1000;
  transition: top 0.3s ease;
}
.skip-link:focus { top: 0; }

/* ============================================================
 *  NAVBAR — Apple-style frosted, barely there
 * ============================================================ */
.navbar-pill {
  position: fixed;
  top: 16px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 100;
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 8px 8px 8px 16px;
  background: rgba(251, 251, 249, 0.72);
  backdrop-filter: saturate(1.8) blur(20px);
  -webkit-backdrop-filter: saturate(1.8) blur(20px);
  border: 1px solid rgba(0, 0, 0, 0.06);
  border-radius: 9999px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.03), 0 8px 30px rgba(0,0,0,0.04);
}

.navbar-pill .logo-mark {
  width: 26px;
  height: 26px;
  flex-shrink: 0;
}

.navbar-link {
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 400;
  color: var(--color-ink);
  text-decoration: none;
  letter-spacing: -0.01em;
  white-space: nowrap;
  transition: opacity 0.2s ease;
  padding: 6px 4px;
}
.navbar-link:hover { opacity: 0.5; }
.navbar-link--active { opacity: 0.4; }

.navbar-link--accent {
  background: var(--color-ink);
  color: var(--color-bone);
  padding: 7px 18px;
  border-radius: 9999px;
  font-size: 14px;
  font-weight: 400;
  letter-spacing: -0.01em;
  transition: opacity 0.2s ease;
}
.navbar-link--accent:hover { opacity: 0.82; }

/* ============================================================
 *  NAVBAR — PRODUCTS DROPDOWN
 * ============================================================ */
.navbar-products {
  position: relative;
}

.navbar-products__trigger {
  cursor: pointer;
  background: none;
  border: none;
  font-family: var(--font-body);
  color: var(--color-ink);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.navbar-products__trigger::after {
  content: '';
  display: inline-block;
  width: 5px;
  height: 5px;
  border-right: 1.5px solid var(--color-graphite);
  border-bottom: 1.5px solid var(--color-graphite);
  transform: rotate(45deg) translateY(-2px);
  transition: transform 0.2s ease;
}

.navbar-products[data-open] .navbar-products__trigger::after {
  transform: rotate(225deg) translateY(1px);
}

.navbar-products__menu {
  position: absolute;
  top: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%) translateY(-4px);
  min-width: 160px;
  background: rgba(251, 251, 249, 0.92);
  backdrop-filter: saturate(1.8) blur(20px);
  -webkit-backdrop-filter: saturate(1.8) blur(20px);
  border: 1px solid rgba(0, 0, 0, 0.06);
  border-radius: 14px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.03), 0 8px 30px rgba(0,0,0,0.06);
  padding: 6px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
  z-index: 200;
}

.navbar-products[data-open] .navbar-products__menu {
  opacity: 1;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}

.navbar-products__item {
  display: block;
  padding: 8px 14px;
  font-size: 14px;
  font-weight: 400;
  color: var(--color-ink);
  text-decoration: none;
  border-radius: 8px;
  letter-spacing: -0.01em;
  transition: background 0.15s ease, opacity 0.15s ease;
}

.navbar-products__item:hover {
  background: rgba(0, 0, 0, 0.04);
}

.navbar-products__item--active {
  color: var(--color-ash);
  pointer-events: none;
}

/* ============================================================
 *  STRUCTURAL
 * ============================================================ */
.section {
  width: 100%;
  position: relative;
  overflow: hidden;
}

/* ============================================================
 *  HERO
 * ============================================================ */
.hero-section {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  background-color: var(--color-bone);
  padding: var(--spacing-20);
  padding-top: 120px;
}

.hero-image {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(0.92);
  z-index: 0;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, rgba(245,245,243,0.15) 0%, rgba(245,245,243,0.75) 60%, var(--color-bone) 100%);
  z-index: 1;
}

.hero-content-cluster {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  margin-top: auto;
  margin-bottom: auto;
  gap: var(--spacing-28);
  z-index: 5;
  position: relative;
}

.hero-subheading {
  font-family: var(--font-title);
  font-size: clamp(48px, 9vw, 96px);
  font-weight: 400;
  line-height: 0.95;
  letter-spacing: -0.02em;
  color: var(--color-ink);
}

.hero-body {
  font-size: clamp(17px, 1.8vw, 21px);
  line-height: 1.5;
  color: var(--color-graphite);
  max-width: 520px;
  text-align: center;
  letter-spacing: -0.01em;
}

.hero-wordmark-wrapper {
  width: 100%;
  overflow: hidden;
  display: flex;
  justify-content: center;
  pointer-events: none;
  margin-bottom: -40px;
  position: relative;
  z-index: 2;
}

.hero-wordmark {
  font-family: var(--font-title);
  font-size: clamp(80px, 24vw, 420px);
  font-weight: 400;
  line-height: 0.82;
  letter-spacing: -0.05em;
  color: var(--color-ink);
  white-space: nowrap;
  opacity: 0.07;
}

/* ============================================================
 *  MANIFEST / LEDGER
 * ============================================================ */
.manifest-ledger-section {
  background-color: var(--color-paper);
  padding: var(--spacing-160) var(--spacing-40);
  border-top: 1px solid var(--color-vellum);
}

.ledger-container {
  max-width: var(--max-width);
  margin: 0 auto;
}

.ledger-intro {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: baseline;
  gap: var(--spacing-60);
  padding-bottom: var(--spacing-80);
  border-bottom: 1px solid var(--color-vellum);
}

.ledger-title {
  font-family: var(--font-title);
  font-size: clamp(40px, 6vw, 72px);
  line-height: 0.92;
  color: var(--color-ink);
  font-weight: 400;
  letter-spacing: -0.02em;
}

.ledger-body {
  font-size: 18px;
  line-height: 1.55;
  color: var(--color-graphite);
  max-width: 480px;
  letter-spacing: -0.01em;
}

.ledger-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-40);
  margin-top: var(--spacing-80);
}

.ledger-card {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-16);
}

.ledger-card__num {
  font-size: 12px;
  font-weight: 600;
  color: var(--color-ash);
  letter-spacing: 0.04em;
}

.ledger-card__heading {
  font-family: var(--font-title);
  font-size: clamp(26px, 3vw, 36px);
  font-weight: 400;
  color: var(--color-ink);
  letter-spacing: -0.01em;
  line-height: 1.05;
}

.ledger-card__text {
  font-size: 16px;
  line-height: 1.55;
  color: var(--color-graphite);
  letter-spacing: -0.01em;
}

/* ============================================================
 *  PILLARS (known page)
 * ============================================================ */
.pillars-section {
  background-color: var(--color-ink);
  padding: var(--spacing-160) var(--spacing-40);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-80);
}

.section-heading {
  font-family: var(--font-title);
  font-size: clamp(40px, 7vw, 96px);
  font-weight: 400;
  line-height: 0.9;
  letter-spacing: -0.02em;
  text-align: center;
}
.section-heading--light { color: var(--color-paper); }

.pillars-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-40);
  width: 100%;
  max-width: var(--max-width);
}

.feature-vignette {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-28);
}

.feature-vignette__caption {
  font-family: var(--font-title);
  font-size: clamp(22px, 2.5vw, 30px);
  color: var(--color-paper);
  letter-spacing: -0.01em;
  text-align: center;
}

.feature-vignette__image {
  width: 240px;
  height: 240px;
  border-radius: 50%;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.12);
}
.feature-vignette__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ============================================================
 *  PROVENANCE
 * ============================================================ */
.provenance-section {
  background-color: var(--color-bone);
  border-top: 1px solid var(--color-ink);
}

.provenance-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-height: 80vh;
}

.provenance-split__visual {
  position: relative;
  width: 100%;
  height: 100%;
}
.provenance-split__visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: filter 0.8s ease;
}
.provenance-split:hover .provenance-split__visual img {
  filter: brightness(1.02);
}

.provenance-split__content {
  padding: var(--spacing-120) var(--spacing-60);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
  gap: var(--spacing-28);
  border-left: 1px solid var(--color-ink);
  background: var(--color-paper);
}

/* text-only provenance variant */
.provenance-split--text {
  display: block;
  min-height: auto;
}
.provenance-split--text .provenance-split__content {
  border-left: none;
  border-top: 1px solid var(--color-ink);
  padding: var(--spacing-120) var(--spacing-40);
  max-width: var(--reading-width);
  margin: 0 auto;
}

.provenance-tag {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--color-graphite);
}

.provenance-heading {
  font-family: var(--font-title);
  font-size: clamp(40px, 5vw, 64px);
  font-weight: 400;
  line-height: 0.95;
  letter-spacing: -0.02em;
}

.provenance-description {
  font-size: 18px;
  line-height: 1.55;
  color: var(--color-graphite);
  max-width: 500px;
  margin-bottom: var(--spacing-16);
  letter-spacing: -0.01em;
}

.provenance-spec-links {
  display: flex;
  gap: var(--spacing-16);
}

/* ============================================================
 *  PULL QUOTE
 * ============================================================ */
.pull-quote-section {
  background-color: var(--color-ink);
  padding: var(--spacing-160) var(--spacing-40);
  display: flex;
  justify-content: center;
}

.pull-quote-container {
  max-width: var(--reading-width);
  text-align: center;
}

.pull-quote {
  font-family: var(--font-title);
  font-size: clamp(28px, 5vw, 52px);
  line-height: 1.15;
  color: var(--color-paper);
  font-weight: 400;
  font-style: italic;
  letter-spacing: -0.02em;
}

/* ============================================================
 *  FAQ
 * ============================================================ */
.faq-section {
  background-color: var(--color-paper);
  padding: var(--spacing-160) var(--spacing-40);
  border-top: 1px solid var(--color-vellum);
}

.faq-container {
  max-width: var(--reading-width);
  margin: 0 auto;
}

.faq-heading {
  font-family: var(--font-title);
  font-size: clamp(36px, 5vw, 56px);
  font-weight: 400;
  line-height: 0.95;
  letter-spacing: -0.02em;
  text-align: center;
  margin-bottom: var(--spacing-80);
}

.faq-item {
  border-bottom: 1px solid var(--color-vellum);
}
.faq-item:first-child { border-top: 1px solid var(--color-vellum); }

.faq-toggle {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-28) 0;
  background: none;
  border: none;
  cursor: pointer;
  font-family: var(--font-body);
  font-size: 17px;
  font-weight: 400;
  color: var(--color-ink);
  text-align: left;
  list-style: none;
  letter-spacing: -0.01em;
  transition: opacity 0.2s ease;
}
.faq-toggle::-webkit-details-marker { display: none; }
.faq-toggle:hover { opacity: 0.55; }

.faq-toggle::after {
  content: '+';
  flex-shrink: 0;
  margin-left: 20px;
  font-size: 22px;
  font-weight: 300;
  color: var(--color-ash);
  transition: transform 0.3s ease;
}
.faq-item[open] .faq-toggle::after {
  content: '\2212';
}

.faq-answer {
  padding-bottom: var(--spacing-28);
}
.faq-answer p {
  font-size: 16px;
  line-height: 1.55;
  color: var(--color-graphite);
  max-width: 620px;
  letter-spacing: -0.01em;
}

/* ============================================================
 *  CONTACT
 * ============================================================ */
.contact-section {
  background-color: var(--color-bone);
  padding: var(--spacing-160) var(--spacing-40);
  border-top: 1px solid var(--color-vellum);
  display: flex;
  justify-content: center;
}

.contact-container {
  max-width: var(--reading-width);
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-28);
}

.contact-heading {
  font-family: var(--font-title);
  font-size: clamp(36px, 5vw, 56px);
  font-weight: 400;
  line-height: 0.95;
  letter-spacing: -0.02em;
}

.contact-body {
  font-size: 18px;
  line-height: 1.55;
  color: var(--color-graphite);
  max-width: 500px;
  letter-spacing: -0.01em;
}

/* ============================================================
 *  TECH SPECS
 * ============================================================ */
.spec-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0 var(--spacing-40);
  max-width: 760px;
  margin: 0 auto;
}

.spec-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: var(--spacing-16) 0;
  border-bottom: 1px solid var(--color-vellum);
}
.spec-row:first-child { border-top: 1px solid var(--color-vellum); }
.spec-row:hover { opacity: 0.65; }

.spec-row__label {
  font-size: 13px;
  color: var(--color-graphite);
  letter-spacing: -0.005em;
  font-weight: 400;
}

.spec-row__value {
  font-size: 15px;
  font-weight: 400;
  color: var(--color-ink);
  letter-spacing: -0.01em;
}

/* ============================================================
 *  BUTTONS — Apple style: pill, solid, no border
 * ============================================================ */
.btn-pill {
  background: var(--color-ink);
  color: var(--color-bone);
  font-size: 15px;
  font-weight: 400;
  padding: 13px 30px;
  border-radius: var(--radius-buttons);
  text-decoration: none;
  display: inline-block;
  border: none;
  letter-spacing: -0.01em;
  transition: opacity 0.2s ease;
}
.btn-pill:hover { opacity: 0.82; }

.ghost-link {
  font-size: 14px;
  text-decoration: none;
  color: var(--color-ink);
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
}
.ghost-link:hover { border-color: var(--color-ink); }

/* ============================================================
 *  REVEAL
 * ============================================================ */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.8s var(--ease-out-expo), transform 0.8s var(--ease-out-expo);
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}
.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }

@keyframes navDrop {
  from { opacity: 0; transform: translateX(-50%) translateY(-10px); }
  to   { opacity: 1; transform: translateX(-50%) translateY(0); }
}
.navbar-pill {
  animation: navDrop 0.5s var(--ease-out-expo) 0.1s backwards;
}

.logo-mark {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  transition: opacity 0.3s ease;
}
.logo-mark img { width: 100%; height: 100%; object-fit: cover; }
.logo-mark:hover { opacity: 0.7; }

/* ============================================================
 *  FOOTER
 * ============================================================ */
.footer-field {
  position: relative;
  width: 100%;
  padding: 50px 60px 40px;
  background-image: url('assets/footer-image.jpg');
  background-size: cover;
  background-position: center;
  background-attachment: fixed;
  background-repeat: no-repeat;
  overflow: hidden;
}

.footer-field__card {
  position: relative;
  background: var(--color-paper);
  padding: 48px 60px 28px;
  z-index: 2;
}

.footer-field__wordmark {
  font-family: 'Instrument Sans', sans-serif;
  font-weight: 700;
  font-size: clamp(60px, 18vw, 200px);
  line-height: 0.9;
  letter-spacing: -0.05em;
  text-align: center;
  margin: 0 0 32px;
  background-image: url('assets/footer-image.jpg');
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  background-attachment: fixed;
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  text-transform: lowercase;
}
.footer-field__wordmark::first-letter { text-transform: uppercase; }

.footer-field__nav {
  display: flex;
  align-items: baseline;
  gap: 24px;
  margin-bottom: 20px;
}

.footer-field__nav-label {
  font-size: 12px;
  font-weight: 700;
  color: var(--color-ink);
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.footer-field__nav-links {
  display: flex;
  gap: 28px;
  align-items: baseline;
  flex-wrap: wrap;
}

.footer-field__nav-links a {
  font-size: 13px;
  font-weight: 400;
  color: var(--color-ink);
  text-decoration: none;
  transition: opacity 0.2s ease;
}
.footer-field__nav-links a:hover { opacity: 0.5; }

.footer-field__bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
}

.footer-field__copyright { font-size: 11px; color: var(--color-ash); }

.footer-field__legal {
  display: flex;
  gap: 8px;
  align-items: center;
  font-size: 11px;
  color: var(--color-ash);
}
.footer-field__legal a {
  color: var(--color-ash);
  text-decoration: none;
  transition: color 0.2s ease;
}
.footer-field__legal a:hover { color: var(--color-ink); }
.footer-field__legal-sep { color: var(--color-vellum); }

/* ============================================================
 *  RESPONSIVE
 * ============================================================ */
@media (max-width: 1024px) {
  .hero-wordmark { font-size: 20vw; }
  .pillars-grid { grid-template-columns: 1fr; gap: var(--spacing-80); }
  .ledger-intro { grid-template-columns: 1fr; gap: var(--spacing-28); }
  .ledger-grid { grid-template-columns: 1fr; gap: var(--spacing-40); }
  .provenance-split { grid-template-columns: 1fr; }
  .provenance-split__content {
    border-left: none;
    border-top: 1px solid var(--color-ink);
    padding: var(--spacing-80) var(--spacing-20);
  }
  .navbar-pill { gap: 16px; padding: 7px 7px 7px 14px; }
  .footer-field { padding: 40px 40px 30px; }
  .footer-field__card { padding: 36px 40px 20px; }
  .footer-field__nav-links { gap: 20px; }
}

@media (max-width: 768px) {
  :root {
    --spacing-160: 100px;
    --spacing-120: 80px;
    --spacing-100: 64px;
    --spacing-80: 56px;
  }
  .navbar-pill { gap: 10px; padding: 6px 6px 6px 12px; top: 10px; }
  .navbar-link { font-size: 12px; }
  .navbar-link--accent { padding: 5px 14px; font-size: 12px; }
  .logo-mark { width: 22px; height: 22px; }
  .hero-section { padding: 90px var(--spacing-20) var(--spacing-20); min-height: 92vh; }
  .hero-wordmark { font-size: 30vw; }
  .spec-grid { grid-template-columns: 1fr; }
  .footer-field { padding: 24px 16px 20px; }
  .footer-field__card { padding: 28px 20px 20px; }
  .footer-field__wordmark { font-size: clamp(40px, 14vw, 80px); margin-bottom: 20px; }
  .footer-field__nav { flex-direction: column; gap: 10px; margin-bottom: 18px; }
  .footer-field__nav-links { gap: 16px; }
  .footer-field__bottom { flex-direction: column; gap: 14px; align-items: flex-start; }
}

@media (max-width: 640px) {
  :root {
    --spacing-160: 80px;
    --spacing-120: 64px;
  }
  .navbar-pill { gap: 8px; padding: 5px 5px 5px 10px; }
  .navbar-link { font-size: 11px; }
  .navbar-link--accent { padding: 5px 12px; font-size: 11px; }
  .feature-vignette__image { width: 200px; height: 200px; }
  .footer-field__wordmark { font-size: clamp(32px, 12vw, 56px); }
}

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .navbar-pill { animation: none; }
  html { scroll-behavior: auto; }
}