/* ============================================================================
   Data Bastion — Splash
   Engineered. Stratified. Quiet.
   Consumes tokens.css. No raw hexes. No gradients. No shadows. Radius ≤ 4px.
   ============================================================================ */

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

html, body {
  margin: 0;
  padding: 0;
  background: var(--db-slate-bg);
  color: var(--db-ink-100);
  font-family: var(--db-font-body);
  font-size: var(--db-size-body);
  line-height: var(--db-leading-base);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-feature-settings: var(--db-font-feature-tabular);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a { color: inherit; text-decoration: none; }
a:hover { color: var(--db-bastion-amber); }
ul { list-style: none; padding: 0; margin: 0; }
code, .mono { font-family: var(--db-font-mono); font-size: 0.92em; }

/* Stratified background: a hairline grid + a single amber thread.
   Pure background pattern — no SVG, no images, no JS. */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, var(--db-slate-hairline) 1px, transparent 1px);
  background-size: 96px 100%;
  opacity: 0.35;
  z-index: 0;
}
body::after {
  content: "";
  position: fixed;
  top: 0; bottom: 0;
  left: 50%;
  width: 1px;
  background: var(--db-bastion-amber);
  opacity: 0.10;
  pointer-events: none;
  z-index: 0;
}

main, header, section, footer { position: relative; z-index: 1; }

/* ============================================================================
   TOP BAR
   ============================================================================ */
.topbar {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24px 48px;
  border-bottom: 1px solid var(--db-slate-hairline);
}

.brand {
  display: flex;
  align-items: center;
  gap: 16px;
  color: var(--db-ink-100);
}
.brand-mark { color: var(--db-ink-100); display: block; }
.brand-wordmark {
  font-family: var(--db-font-mono);
  font-size: var(--db-size-meta);
  letter-spacing: 0.16em;
  color: var(--db-ink-100);
}

.topbar-nav {
  display: flex;
  align-items: center;
  gap: 32px;
}

.link-meta {
  font-family: var(--db-font-mono);
  font-size: var(--db-size-meta);
  letter-spacing: var(--db-track-meta);
  text-transform: uppercase;
  color: var(--db-ink-300);
}
.link-meta:hover { color: var(--db-bastion-amber); }

/* ============================================================================
   BUTTONS
   ============================================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  font-family: var(--db-font-mono);
  font-size: var(--db-size-meta);
  letter-spacing: var(--db-track-meta);
  text-transform: uppercase;
  border-radius: var(--db-radius-0);
  border: 1px solid transparent;
  cursor: pointer;
  transition: background var(--db-duration-fast) var(--db-ease-out),
              color var(--db-duration-fast) var(--db-ease-out),
              border-color var(--db-duration-fast) var(--db-ease-out);
  line-height: 1;
}

.btn--primary {
  background: var(--db-bastion-amber);
  color: var(--db-ink-900);
  border-color: var(--db-bastion-amber);
}
.btn--primary:hover {
  background: transparent;
  color: var(--db-bastion-amber);
}

.btn--secondary {
  background: transparent;
  color: var(--db-ink-100);
  border-color: var(--db-bastion-blue);
}
.btn--secondary:hover {
  background: var(--db-bastion-blue);
  color: var(--db-ink-100);
}

.btn--ghost {
  background: transparent;
  color: var(--db-ink-100);
  border-color: var(--db-slate-hairline);
}
.btn--ghost:hover {
  border-color: var(--db-bastion-amber);
  color: var(--db-bastion-amber);
}

/* ============================================================================
   HERO
   ============================================================================ */
.hero {
  padding: 96px 48px 64px;
  max-width: 1440px;
  margin: 0 auto;
  width: 100%;
}

.hero-meta {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-family: var(--db-font-mono);
  font-size: var(--db-size-meta);
  letter-spacing: var(--db-track-meta);
  text-transform: uppercase;
  color: var(--db-ink-300);
  padding: 8px 16px;
  border: 1px solid var(--db-slate-hairline);
  border-radius: var(--db-radius-0);
  margin-bottom: 48px;
}

.hero-tagline {
  font-family: var(--db-font-display);
  font-weight: var(--db-weight-halbfett);
  font-size: clamp(48px, 7vw, 96px);
  line-height: 1.05;
  letter-spacing: -0.015em;
  color: var(--db-ink-100);
  margin: 0;
  max-width: 1200px;
}
.hero-tagline-amber {
  display: block;
  color: var(--db-bastion-amber);
}

.hero-tagline-es {
  font-family: var(--db-font-mono);
  font-size: var(--db-size-meta);
  letter-spacing: var(--db-track-meta);
  text-transform: uppercase;
  color: var(--db-ink-300);
  margin: 24px 0 0;
  /* amber leading rule */
  padding-left: 16px;
  border-left: 2px solid var(--db-bastion-amber);
}

.hero-subtitle {
  font-family: var(--db-font-body);
  font-size: var(--db-size-body-l);
  line-height: var(--db-leading-base);
  color: var(--db-ink-100);
  margin: 48px 0 0;
  max-width: 720px;
}

.hero-ctas {
  margin-top: 48px;
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
}

/* ============================================================================
   TILES — cross-domain proof band
   ============================================================================ */
.tiles {
  max-width: 1440px;
  margin: 0 auto;
  padding: 64px 48px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border-top: 1px solid var(--db-slate-hairline);
  border-bottom: 1px solid var(--db-slate-hairline);
}

.tile {
  padding: 32px;
  border-right: 1px solid var(--db-slate-hairline);
  display: flex;
  flex-direction: column;
  gap: 24px;
  min-height: 320px;
}
.tile:last-child { border-right: none; }

.tile-meta {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  font-family: var(--db-font-mono);
  font-size: var(--db-size-meta);
  letter-spacing: var(--db-track-meta);
  text-transform: uppercase;
  color: var(--db-ink-300);
}
.tile-meta-num { color: var(--db-bastion-amber); }
.tile-meta-domain--gg { color: var(--db-domain-gg); }
.tile-meta-domain--dr { color: var(--db-domain-drilling); }
.tile-meta-domain--pr { color: var(--db-domain-production); }

.tile-icon {
  color: var(--db-ink-300);
}

.tile-line {
  font-family: var(--db-font-body);
  font-size: var(--db-size-body-l);
  line-height: var(--db-leading-snug);
  color: var(--db-ink-100);
  margin: 0;
}
.tile-line code {
  color: var(--db-ink-300);
}
.tile-line .arrow {
  color: var(--db-bastion-blue);
  padding: 0 2px;
}

.tile-stat {
  margin-top: auto;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding-top: 16px;
  border-top: 1px solid var(--db-slate-hairline);
}
.tile-stat-num {
  font-family: var(--db-font-mono);
  font-feature-settings: var(--db-font-feature-tabular);
  font-size: 48px;
  line-height: 1;
  color: var(--db-ink-100);
  letter-spacing: -0.01em;
  display: inline-flex;
  align-items: center;
  gap: 12px;
}
.tile-stat-num.live { color: var(--db-bastion-amber); }
.tile-stat-unit {
  font-family: var(--db-font-mono);
  font-size: var(--db-size-meta);
  letter-spacing: var(--db-track-meta);
  text-transform: uppercase;
  color: var(--db-ink-300);
}

/* ============================================================================
   LIVE DOT — used in tile + hero meta
   ============================================================================ */
.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  display: inline-block;
  background: var(--db-signal-green);
  flex-shrink: 0;
}
.status-dot--live {
  background: var(--db-signal-cyan);
  animation: pulse 1800ms var(--db-ease-in-out) infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50%      { opacity: 0.35; }
}

/* ============================================================================
   ARCHITECTURE STRIP
   ============================================================================ */
.arch {
  max-width: 1440px;
  margin: 0 auto;
  padding: 48px;
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.arch-meta {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  font-family: var(--db-font-mono);
  font-size: var(--db-size-meta);
  letter-spacing: var(--db-track-meta);
  text-transform: uppercase;
  color: var(--db-ink-300);
}
.arch-meta > :first-child { color: var(--db-bastion-amber); }

.arch-diagram {
  width: 100%;
  height: auto;
  max-height: 250px;
}

.arch-node {
  fill: var(--db-slate-panel);
  stroke: var(--db-slate-mid);
  stroke-width: 1.25;
}
.arch-node--active {
  stroke: var(--db-bastion-amber);
  stroke-width: 1.75;
}
.arch-label {
  font-family: var(--db-font-display);
  font-size: 18px;
  font-weight: var(--db-weight-medium);
  fill: var(--db-ink-100);
}
.arch-label--active { fill: var(--db-bastion-amber); }

.arch-sub {
  font-family: var(--db-font-mono);
  font-size: 11px;
  letter-spacing: 1.2px;
  fill: var(--db-ink-300);
  text-transform: uppercase;
}
.arch-sub--active { fill: var(--db-bastion-amber); }
.arch-sub-sm {
  font-family: var(--db-font-mono);
  font-size: 10px;
  letter-spacing: 0.8px;
  fill: var(--db-slate-mid);
}

.arch-edge { stroke: var(--db-slate-mid); stroke-width: 1.25; fill: none; }
.arch-edge--active { stroke: var(--db-bastion-amber); stroke-width: 1.75; }
.arch-arrow { fill: var(--db-slate-mid); }
.arch-arrow--active { fill: var(--db-bastion-amber); }

/* ============================================================================
   FOOTER
   ============================================================================ */
.footer {
  margin-top: auto;
  padding: 48px;
  border-top: 1px solid var(--db-slate-hairline);
  max-width: 1440px;
  margin-left: auto;
  margin-right: auto;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 48px;
  font-family: var(--db-font-mono);
  font-size: var(--db-size-meta);
  line-height: 1.7;
  color: var(--db-ink-300);
}

.footer-label {
  letter-spacing: var(--db-track-meta);
  text-transform: uppercase;
  color: var(--db-ink-100);
  margin-bottom: 12px;
}
.footer-list code { color: var(--db-bastion-amber); }
.footer-list a { color: var(--db-ink-300); }
.footer-list a:hover { color: var(--db-bastion-amber); }
.footer-col--right { text-align: right; }
.footer-build { color: var(--db-slate-mid); margin-top: 12px; }

/* ============================================================================
   RESPONSIVE — graceful, not fancy
   ============================================================================ */
@media (max-width: 960px) {
  .topbar { padding: 16px 24px; }
  .hero { padding: 48px 24px 32px; }
  .tiles { grid-template-columns: 1fr; padding: 32px 24px; }
  .tile { border-right: none; border-bottom: 1px solid var(--db-slate-hairline); min-height: 0; }
  .tile:last-child { border-bottom: none; }
  .arch { padding: 32px 24px; }
  .footer { grid-template-columns: 1fr; padding: 32px 24px; gap: 24px; }
  .footer-col--right { text-align: left; }
  body::before { background-size: 48px 100%; }
}

/* Selection — amber identity */
::selection { background: var(--db-bastion-amber); color: var(--db-ink-900); }

/* ============================================================================
   Landing layout — round 2
   Deck-feel scroller for /OSDU. Five sections; each is a near-fullscreen
   slide that snaps. Screenshots dock to the right column on desktop and
   stack below the copy on mobile. Inherits the splash type ramp and
   spacing scale — only the section grid and the stat ramp are new.
   ============================================================================ */

/* Opt the document into vertical scroll-snap. Honors prefers-reduced-motion. */
html.osdu-deck { scroll-snap-type: y proximity; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html.osdu-deck { scroll-snap-type: none; scroll-behavior: auto; }
}

/* A section is a slide. min-height: 100vh, padded on the splash 96/48
   rhythm, separated from the next by an --osdu-hairline. */
.section {
  min-height: 100vh;
  scroll-snap-align: start;
  scroll-snap-stop: normal;
  padding: 96px 48px;
  max-width: 1440px;
  margin: 0 auto;
  width: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  border-bottom: 1px solid var(--osdu-hairline);
  position: relative;
}
.section:last-of-type { border-bottom: none; }

/* Section meta (§02 · RECORD) — sits above the title, mono, +8% tracking. */
.section-meta {
  font-family: var(--db-font-mono);
  font-size: var(--db-size-meta);
  letter-spacing: var(--db-track-meta);
  text-transform: uppercase;
  color: var(--db-ink-300);
  margin: 0 0 24px;
}
.section-meta .section-num { color: var(--osdu-accent); }

/* Section title — display-l, splash type ramp. */
.section-title {
  font-family: var(--db-font-display);
  font-weight: var(--db-weight-halbfett);
  font-size: var(--db-size-display-l);
  line-height: var(--db-leading-tight);
  letter-spacing: var(--db-track-display);
  color: var(--db-ink-100);
  margin: 0 0 32px;
  max-width: 720px;
}

/* Section lede — body-l prose, capped at 64ch per design brief §6. */
.section-lede {
  font-family: var(--db-font-body);
  font-size: var(--db-size-body-l);
  line-height: var(--db-leading-base);
  color: var(--db-ink-100);
  margin: 0 0 48px;
  max-width: 64ch;
}

/* 7-col copy + 5-col figure, splash gutter. Screenshot docks right. */
.section-grid {
  display: grid;
  grid-template-columns: 7fr 5fr;
  gap: 48px;
  align-items: center;
}
.section-grid > .section-copy { min-width: 0; }
.section-grid > .section-figure {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* Screenshots — native 1440x900 source, capped at the column width,
   framed in a 1px slate hairline. Lazy-loaded below the fold. No shadow,
   no rounded corners (radius-0). */
.section-figure img,
.section-figure picture > img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 1440 / 900;
  object-fit: cover;
  border: 1px solid var(--db-slate-hairline);
  border-radius: var(--db-radius-0);
  background: var(--db-slate-panel);
}
.section-figure figcaption {
  font-family: var(--db-font-mono);
  font-size: var(--db-size-meta);
  letter-spacing: var(--db-track-meta);
  text-transform: uppercase;
  color: var(--db-ink-300);
  line-height: var(--db-leading-snug);
}

/* Hero stat — big mono numeral with an OSDU-accent underline rule.
   Used once on §01 for the 1.35M ProductionVolumes figure. */
.hero-stat {
  font-family: var(--osdu-data-mono);
  font-feature-settings: var(--db-font-feature-tabular);
  font-size: var(--osdu-stat-size);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--db-ink-100);
  margin: 0;
  padding-bottom: 16px;
  border-bottom: 2px solid var(--osdu-accent);
  display: inline-block;
}
.hero-stat-unit {
  font-family: var(--db-font-mono);
  font-size: var(--db-size-meta);
  letter-spacing: var(--db-track-meta);
  text-transform: uppercase;
  color: var(--db-ink-300);
  display: block;
  margin-top: 16px;
}

/* Four-up stat stack — for §04 "corpus at scale": wells / production /
   seismic / tops. Inherits splash tile borders; not a card. */
.stat-stack {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  border-top: 1px solid var(--db-slate-hairline);
  border-bottom: 1px solid var(--db-slate-hairline);
}
.stat-stack-item {
  padding: 32px 24px;
  border-right: 1px solid var(--db-slate-hairline);
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-height: 160px;
}
.stat-stack-item:last-child { border-right: none; }
.stat-stack-num {
  font-family: var(--osdu-data-mono);
  font-feature-settings: var(--db-font-feature-tabular);
  font-size: clamp(2rem, 3.6vw, 3rem);
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--db-ink-100);
}
.stat-stack-label {
  font-family: var(--db-font-mono);
  font-size: var(--db-size-meta);
  letter-spacing: var(--db-track-meta);
  text-transform: uppercase;
  color: var(--db-ink-300);
  margin-top: auto;
}

/* CTAs — aliases of the existing .btn variants, but with the verbs that
   the conversion model needs. Keep amber primary; ghost secondary. */
.cta-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 16px 32px;
  font-family: var(--db-font-mono);
  font-size: var(--db-size-meta);
  letter-spacing: var(--db-track-meta);
  text-transform: uppercase;
  border-radius: var(--db-radius-0);
  border: 1px solid var(--db-bastion-amber);
  background: var(--db-bastion-amber);
  color: var(--db-ink-900);
  cursor: pointer;
  line-height: 1;
  transition: background var(--db-duration-fast) var(--db-ease-out),
              color var(--db-duration-fast) var(--db-ease-out);
}
.cta-primary:hover {
  background: transparent;
  color: var(--db-bastion-amber);
}
.cta-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 16px 32px;
  font-family: var(--db-font-mono);
  font-size: var(--db-size-meta);
  letter-spacing: var(--db-track-meta);
  text-transform: uppercase;
  border-radius: var(--db-radius-0);
  border: 1px solid var(--db-slate-hairline);
  background: transparent;
  color: var(--db-ink-100);
  cursor: pointer;
  line-height: 1;
  transition: border-color var(--db-duration-fast) var(--db-ease-out),
              color var(--db-duration-fast) var(--db-ease-out);
}
.cta-secondary:hover {
  border-color: var(--osdu-accent);
  color: var(--osdu-accent);
}

/* Accent hairline — the OSDU story's structural rule. Use it between
   sub-blocks inside a section, and as the section title underline.
   Never use --osdu-accent on body copy. */
.accent-hairline {
  display: block;
  width: 100%;
  height: 1px;
  background: var(--osdu-accent);
  opacity: 0.5;
  border: 0;
  margin: 32px 0;
}
.accent-hairline--short {
  width: 64px;
  opacity: 1;
  margin: 0 0 32px;
}

/* Responsive — collapse to single column at the splash's 960 break. */
@media (max-width: 960px) {
  .section { padding: 64px 24px; min-height: auto; }
  .section-grid { grid-template-columns: 1fr; gap: 32px; }
  .section-title { font-size: 32px; }
  .stat-stack {
    grid-template-columns: 1fr 1fr;
  }
  .stat-stack-item:nth-child(2) { border-right: none; }
  .stat-stack-item:nth-child(1),
  .stat-stack-item:nth-child(2) {
    border-bottom: 1px solid var(--db-slate-hairline);
  }
  .stat-stack-item:nth-child(4) { border-right: none; }
  html.osdu-deck { scroll-snap-type: none; }
}