/* ============================================================
   HACHURE.ORG — Cartographic survey-plate aesthetic
   Vintage engraved map × modern spec document
   ============================================================ */

/* --- Google Fonts --- */
@import url('https://fonts.googleapis.com/css2?family=Fraunces:ital,opsz,wght@0,9..144,300;0,9..144,400;0,9..144,500;0,9..144,600;1,9..144,300;1,9..144,400&family=IBM+Plex+Mono:wght@400;500&display=swap');

/* --- Design tokens --- */
:root {
  /* Paper and ink — iron-gall palette */
  --paper:        #F7F2E8;
  --paper-warm:   #EFE9D6;
  --paper-dark:   #E6DFC9;
  --ink:          #1E1A12;        /* iron-gall near-black */
  --ink-mid:      #3A3226;        /* mid ink for body */
  --ink-light:    #6B5F48;        /* light ink for marginalia */
  --ink-faint:    #9E9178;        /* faintest ink — rules, plates */

  /* Surveyor's red — single sharp accent */
  --red:          #A63216;        /* oxide / cadmium red */
  --red-light:    #C94020;        /* brighter red for hover */
  --red-faint:    rgba(166, 50, 22, 0.12);

  /* Typography */
  --font-display: 'Fraunces', Georgia, 'Times New Roman', serif;
  --font-body:    'Fraunces', Georgia, 'Times New Roman', serif;
  --font-mono:    'IBM Plex Mono', 'Courier New', monospace;

  /* Spacing — generous survey-plate margins */
  --gutter:       clamp(1.5rem, 5vw, 4rem);
  --col-text:     68ch;
  --radius:       2px;
  --sticky-header-offset: 7rem;

  /* Thin rules */
  --rule:         1px solid var(--ink-faint);
  --rule-accent:  1px solid var(--red);
}

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

html {
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
  scroll-padding-top: var(--sticky-header-offset);
}

body {
  background-color: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-weight: 400;
  line-height: 1.65;
  min-height: 100vh;
  /* Subtle paper texture via CSS noise pattern */
  background-image:
    radial-gradient(ellipse at 20% 80%, rgba(180,160,100,0.06) 0%, transparent 60%),
    radial-gradient(ellipse at 80% 20%, rgba(160,140,80,0.04) 0%, transparent 60%);
}

/* --- Plate border framing --- */
body::before {
  content: '';
  display: block;
  position: fixed;
  inset: 12px;
  border: 1px solid var(--ink-faint);
  pointer-events: none;
  z-index: 100;
}

body::after {
  content: '';
  display: block;
  position: fixed;
  inset: 16px;
  border: 1px solid rgba(30, 26, 18, 0.08);
  pointer-events: none;
  z-index: 99;
}

/* --- Layout wrapper --- */
.site-wrapper {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 var(--gutter);
}

/* ============================================================
   HEADER / NAV
   ============================================================ */

.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  padding-block: 2rem 1.5rem;
  background-color: var(--paper);
  background-image:
    radial-gradient(ellipse at 20% 80%, rgba(180,160,100,0.06) 0%, transparent 60%),
    radial-gradient(ellipse at 80% 20%, rgba(160,140,80,0.04) 0%, transparent 60%);
  border-bottom: var(--rule);
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.site-wordmark {
  font-family: var(--font-display);
  font-size: clamp(1rem, 2.5vw, 1.2rem);
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink);
  text-decoration: none;
}

.site-wordmark span {
  color: var(--red);
  margin-left: 0.15em;
}

.site-nav {
  display: flex;
  gap: 1.75rem;
  align-items: baseline;
  flex-wrap: wrap;
}

.site-nav a {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 400;
  letter-spacing: 0.06em;
  color: var(--ink-light);
  text-decoration: none;
  text-transform: uppercase;
  transition: color 0.15s ease;
}

.site-nav a:hover {
  color: var(--red);
}

.external-arrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.68em;
  line-height: 1;
  margin-left: 0.18em;
  position: relative;
  top: -0.08em;
}

/* ============================================================
   HERO
   ============================================================ */

.hero {
  position: relative;
  padding-block-start: 3rem;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: start;
}

.hero-text {
  padding-top: 2rem;
  position: relative;
  z-index: 2;
}

/* Plate number — marginalia style */
.plate-label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--red);
  text-transform: uppercase;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.plate-label::before {
  content: '';
  display: inline-block;
  width: 24px;
  height: 1px;
  background: var(--red);
}

.hero-heading {
  font-family: var(--font-display);
  font-size: clamp(3.5rem, 8vw, 6.5rem);
  font-weight: 300;
  line-height: 0.92;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin-bottom: 0.5rem;

  /* Staggered fade-up on load */
  animation: fade-up 0.7s ease-out both;
  animation-delay: 0.1s;
}

.hero-subhead {
  font-family: var(--font-display);
  font-size: clamp(1.1rem, 2.5vw, 1.55rem);
  font-weight: 300;
  font-style: italic;
  color: var(--ink-mid);
  margin-bottom: 2.5rem;
  line-height: 1.3;

  animation: fade-up 0.7s ease-out both;
  animation-delay: 0.22s;
}

.hero-definition {
  font-size: 0.98rem;
  font-weight: 400;
  color: var(--ink-mid);
  line-height: 1.7;
  max-width: 48ch;
  border-left: 2px solid var(--ink-faint);
  padding-left: 1.2rem;
  margin-bottom: 2.5rem;

  animation: fade-up 0.7s ease-out both;
  animation-delay: 0.34s;
}

.hero-definition strong {
  color: var(--ink);
  font-weight: 500;
}

.hero-namespace {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--ink-light);
  letter-spacing: 0.04em;

  animation: fade-up 0.7s ease-out both;
  animation-delay: 0.46s;
}

.hero-namespace code {
  background: var(--paper-dark);
  border: var(--rule);
  padding: 0.15em 0.5em;
  border-radius: var(--radius);
  font-family: var(--font-mono);
  color: var(--ink);
}

/* Hero SVG panel */
.hero-illustration {
  position: relative;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  overflow: hidden;
  opacity: 0;
  animation: fade-in 1s ease-out 0.3s both;
}

.hero-illustration img,
.hero-illustration svg {
  width: 100%;
  height: auto;
  max-width: 480px;
  display: block;
  filter: sepia(8%) contrast(1.05);
}

/* Thin plate rule below hero */
.hero-rule {
  margin: 3rem 0 0;
  border: none;
  border-top: var(--rule);
  position: relative;
}

.hero-rule::after {
  content: '— PLATE I —';
  position: absolute;
  top: -0.7em;
  left: 50%;
  transform: translateX(-50%);
  background: var(--paper);
  padding: 0 1em;
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.14em;
  color: var(--ink-faint);
  text-transform: uppercase;
}

/* ============================================================
   SECTION COMMON
   ============================================================ */

.section {
  padding-block: 4rem;
  border-bottom: var(--rule);
}

#verbs {
  scroll-margin-top: 2rem;
}

.section:last-of-type {
  border-bottom: none;
}

.section-label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--red);
  text-transform: uppercase;
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.section-number {
  font-style: normal;
  color: var(--ink-light);
  font-weight: 400;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 400;
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--ink);
  margin-bottom: 1.5rem;
}

.section-body {
  max-width: var(--col-text);
  font-size: 0.97rem;
  color: var(--ink-mid);
  line-height: 1.75;
}

.section-body p + p {
  margin-top: 1em;
}

/* ============================================================
   §1 — THE THREE VERBS (Assert / Observe / Resolve)
   ============================================================ */

.verbs-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border: var(--rule);
  margin-top: 2.5rem;
}

.verb-card {
  padding: 2rem 1.75rem;
  border-right: var(--rule);
  position: relative;
}

.verb-card:last-child {
  border-right: none;
}

.verb-number {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--ink-faint);
  text-transform: uppercase;
  margin-bottom: 0.75rem;
  display: block;
}

.verb-name {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3.5vw, 2.4rem);
  font-weight: 400;
  color: var(--ink);
  line-height: 1;
  margin-bottom: 0.75rem;
}

.verb-name em {
  font-style: italic;
  color: var(--red);
}

.verb-desc {
  font-size: 0.88rem;
  color: var(--ink-mid);
  line-height: 1.65;
}

/* thin accent rule top on hover */
.verb-card::before {
  content: '';
  display: block;
  position: absolute;
  top: -1px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--red);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s ease;
}

.verb-card:hover::before {
  transform: scaleX(1);
}

/* ============================================================
   §2 — RECOMPUTE IT YOURSELF
   ============================================================ */

.recompute-layout {
  display: grid;
  grid-template-columns: 5fr 4fr;
  gap: 4rem;
  align-items: start;
}

.status-formula {
  margin: 2rem 0;
  padding: 1.5rem 1.75rem;
  background: var(--paper-warm);
  border: var(--rule);
  border-left: 3px solid var(--red);
  position: relative;
}

.status-formula code {
  font-family: var(--font-mono);
  font-size: clamp(0.78rem, 1.5vw, 0.9rem);
  color: var(--ink);
  letter-spacing: 0.02em;
  white-space: pre-wrap;
  word-break: break-word;
}

.status-formula .formula-label {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--red);
  margin-bottom: 0.5rem;
  display: block;
}

.status-list {
  margin-top: 1.5rem;
}

.status-list-title {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-light);
  margin-bottom: 1rem;
}

.status-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.82rem;
}

.status-table tr {
  border-bottom: 1px solid var(--paper-dark);
}

.status-table tr:last-child {
  border-bottom: none;
}

.status-table td {
  padding: 0.5rem 0;
  vertical-align: top;
}

.status-table td:first-child {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--ink);
  font-weight: 500;
  width: 7em;
  padding-right: 1rem;
  white-space: nowrap;
}

.status-table td:last-child {
  color: var(--ink-mid);
  line-height: 1.55;
}

/* Status badge dots */
.status-dot {
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  margin-right: 0.4em;
  vertical-align: middle;
  position: relative;
  top: -1px;
}

.dot-unknown     { background: var(--ink-faint); }
.dot-proposed    { background: #8B7355; }
.dot-assumed     { background: #6B8C6B; }
.dot-verified    { background: var(--red); }
.dot-stale       { background: #B8860B; }
.dot-disputed    { background: #A0522D; }
.dot-superseded  { background: var(--ink-light); }
.dot-rejected    { background: var(--ink-mid); }

/* Conformance block (right column) */
.conformance-aside {
  padding-top: 0.5rem;
}

.conformance-aside h3 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 400;
  font-style: italic;
  color: var(--ink);
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: var(--rule);
}

.conformance-aside p {
  font-size: 0.86rem;
  color: var(--ink-mid);
  line-height: 1.7;
  margin-bottom: 1rem;
}

.conformance-aside .mono-note {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--ink-light);
  letter-spacing: 0.02em;
  padding: 0.75rem;
  background: var(--paper-warm);
  border: var(--rule);
  line-height: 1.6;
}

/* ============================================================
   §3 — CORE RECORDS
   ============================================================ */

.records-intro {
  max-width: var(--col-text);
  font-size: 0.97rem;
  color: var(--ink-mid);
  line-height: 1.75;
  margin-bottom: 2.5rem;
}

.records-strip {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 0;
  border: var(--rule);
}

.record-item {
  padding: 1.5rem 1.5rem 1.25rem;
  border-bottom: var(--rule);
  border-right: var(--rule);
  position: relative;
  transition: background 0.15s ease;
}

.record-item:hover {
  background: var(--paper-warm);
}

/* Remove right border for items at right edge */
.record-item:nth-child(3n),
.record-item:last-child {
  border-right: none;
}

/* Last row: remove bottom borders */
.record-item:nth-last-child(-n+3) {
  border-bottom: none;
}

.record-name {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--ink);
  letter-spacing: 0.03em;
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.record-name::before {
  content: '';
  display: inline-block;
  width: 5px;
  height: 5px;
  background: var(--red);
  border-radius: 50%;
  flex-shrink: 0;
}

.record-desc {
  font-size: 0.84rem;
  color: var(--ink-mid);
  line-height: 1.6;
}

/* ============================================================
   §4 — PLAYS NICELY
   ============================================================ */

.interop-intro {
  max-width: var(--col-text);
  font-size: 0.97rem;
  color: var(--ink-mid);
  line-height: 1.75;
  margin-bottom: 2.5rem;
}

.interop-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 0;
  border: var(--rule);
}

.interop-item {
  padding: 1.5rem;
  border-bottom: var(--rule);
  border-right: var(--rule);
}

.interop-item:nth-child(4n) {
  border-right: none;
}

.interop-item:nth-last-child(-n+4) {
  border-bottom: none;
}

.interop-standard {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--red);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
  display: block;
}

.interop-role {
  font-size: 0.82rem;
  color: var(--ink-mid);
  line-height: 1.6;
}

.interop-role strong {
  color: var(--ink);
  font-weight: 500;
}

/* ============================================================
   §5 — STATUS / FOOTER
   ============================================================ */

.status-footer {
  padding-block: 3.5rem 2.5rem;
}

.status-footer-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 3rem;
  padding-bottom: 3rem;
  border-bottom: var(--rule);
}

.footer-col-title {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: 1rem;
  padding-bottom: 0.6rem;
  border-bottom: var(--rule);
}

.footer-col-body {
  font-size: 0.85rem;
  color: var(--ink-mid);
  line-height: 1.7;
}

.footer-col-body a {
  color: var(--ink);
  text-decoration: underline;
  text-underline-offset: 2px;
  text-decoration-color: var(--ink-faint);
  transition: color 0.15s, text-decoration-color 0.15s;
}

.footer-col-body a:hover {
  color: var(--red);
  text-decoration-color: var(--red);
}

.footer-col-body code {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  background: var(--paper-dark);
  border: var(--rule);
  padding: 0.1em 0.4em;
  border-radius: var(--radius);
}

.footer-col-body .status-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--red);
  border: 1px solid var(--red);
  padding: 0.2em 0.5em;
  border-radius: var(--radius);
  margin-bottom: 0.75rem;
}

.site-footer-base {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  padding-top: 1.75rem;
}

.footer-base-left {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.06em;
  color: var(--ink-light);
}

.footer-base-left a {
  color: var(--ink-light);
  text-decoration: none;
  transition: color 0.15s;
}

.footer-base-left a:hover {
  color: var(--red);
}

.footer-base-right {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.08em;
  color: var(--ink-light);
  text-transform: uppercase;
}

/* ============================================================
   ANIMATIONS
   ============================================================ */

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

@keyframes fade-in {
  from { opacity: 0; }
  to   { opacity: 1; }
}

/* Section reveal on scroll */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .hero-heading, .hero-subhead, .hero-definition,
  .hero-namespace, .hero-illustration {
    animation: none;
    opacity: 1;
    transform: none;
  }
}

/* ============================================================
   RESPONSIVE
   ============================================================ */

@media (max-width: 900px) {
  :root {
    --sticky-header-offset: 8.5rem;
  }

  .hero-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .hero-illustration {
    order: -1;
    opacity: 1;
  }

  .hero-illustration img {
    max-width: 320px;
    margin: 0 auto;
  }

  .recompute-layout {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .verbs-grid {
    grid-template-columns: 1fr;
  }

  .verb-card {
    border-right: none;
    border-bottom: var(--rule);
  }

  .verb-card:last-child {
    border-bottom: none;
  }

  .status-footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }
}

@media (max-width: 600px) {
  :root {
    --sticky-header-offset: 7.25rem;
  }

  body::before, body::after { display: none; }

  .site-header {
    align-items: flex-start;
    gap: 0.75rem;
    padding-block: 0.9rem 0.8rem;
  }

  .site-nav {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0.35rem 0.75rem;
    width: 100%;
  }

  .site-nav a {
    font-size: 0.62rem;
    line-height: 1.25;
    white-space: nowrap;
  }

  .status-footer-grid {
    grid-template-columns: 1fr;
  }

  .records-strip {
    grid-template-columns: 1fr;
  }

  .record-item {
    border-right: none !important;
  }

  .record-item:nth-last-child(-n+3) {
    border-bottom: var(--rule) !important;
  }

  .record-item:last-child {
    border-bottom: none !important;
  }

  .interop-grid {
    grid-template-columns: 1fr 1fr;
  }

  .interop-item:nth-child(4n) {
    border-right: var(--rule);
  }

  .interop-item:nth-child(2n) {
    border-right: none !important;
  }

  .site-footer-base {
    flex-direction: column;
    gap: 0.5rem;
  }
}

/* ============================================================
   UTILITY
   ============================================================ */

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border-width: 0;
}

a {
  color: inherit;
}

code {
  font-family: inherit;
  font-size: 0.95em;
  overflow-wrap: anywhere;
}