/* Borda Antikvarium — Website #91
   Margin-note modernism. Fully offline. */

:root {
  --parchment: #efe3cd;
  --paper: #f7f0e4;
  --offwhite: #fbf7ef;
  --ink-blue: #25384a;
  --ink-soft: #40566d;
  --rust: #9a5d44;
  --olive: #747866;
  --brown: #75543d;
  --charcoal: #2c2d2a;
  --line: rgba(44, 45, 42, 0.16);
  --serif: Georgia, "Times New Roman", serif;
  --sans: Arial, Helvetica, sans-serif;
  --mono: "Courier New", Courier, monospace;
  --shadow: 0 18px 42px rgba(67, 52, 39, 0.10);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--charcoal);
  background:
    linear-gradient(180deg, rgba(154, 93, 68, 0.05), transparent 16rem),
    var(--paper);
  font-family: var(--sans);
  line-height: 1.6;
  overflow-x: hidden;
}

a {
  color: inherit;
}

.skip-link {
  position: fixed;
  left: 1rem;
  top: 1rem;
  z-index: 999;
  padding: 0.7rem 1rem;
  background: var(--ink-blue);
  color: var(--offwhite);
  text-decoration: none;
  transform: translateY(-160%);
}

.skip-link:focus {
  transform: translateY(0);
}

.shell {
  width: min(1160px, calc(100% - 40px));
  margin-inline: auto;
}

.section {
  padding: 5rem 0;
  scroll-margin-top: 7rem;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid var(--line);
  background: rgba(247, 240, 228, 0.95);
  backdrop-filter: blur(10px);
}

.header-inner {
  min-height: 76px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}

.brand {
  display: grid;
  text-decoration: none;
  line-height: 1;
}

.brand-main {
  font-family: var(--serif);
  font-size: 1.3rem;
}

.brand-sub {
  margin-top: 0.18rem;
  color: var(--rust);
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.main-nav,
.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 1.15rem;
}

.main-nav a,
.footer-nav a {
  text-decoration: none;
  font-size: 0.8rem;
  letter-spacing: 0.05em;
}

.main-nav a {
  padding: 0.45rem 0;
  border-bottom: 1px solid transparent;
}

.main-nav a:hover,
.main-nav a:focus-visible,
.footer-nav a:hover,
.footer-nav a:focus-visible {
  color: var(--ink-blue);
  border-color: currentColor;
}

.hero {
  padding: 4.5rem 0 5.5rem;
  scroll-margin-top: 7rem;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(360px, 0.92fr);
  gap: clamp(3rem, 7vw, 7rem);
  align-items: center;
}

.eyebrow {
  margin: 0 0 0.8rem;
  color: var(--rust);
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.page-marker {
  margin-bottom: 1rem;
  color: var(--olive);
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
}

h1,
h2,
h3 {
  margin-top: 0;
  font-family: var(--serif);
  font-weight: 400;
  letter-spacing: -0.03em;
}

h1 {
  max-width: 720px;
  margin-bottom: 1.4rem;
  font-size: clamp(3.4rem, 7vw, 6.6rem);
  line-height: 0.98;
}

h2 {
  margin-bottom: 1rem;
  font-size: clamp(2.25rem, 4.7vw, 4.1rem);
  line-height: 1.04;
}

h3 {
  margin-bottom: 0.5rem;
  font-size: 1.5rem;
}

p {
  margin-top: 0;
  color: #565b5d;
}

.hero-text {
  max-width: 630px;
  margin-bottom: 1.8rem;
  font-size: 1.05rem;
}

.cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0.8rem 1.2rem;
  border: 1px solid var(--ink-blue);
  background: var(--ink-blue);
  color: var(--offwhite);
  text-decoration: none;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.cta:hover,
.cta:focus-visible {
  transform: translateY(-2px);
  box-shadow: 0 12px 26px rgba(37, 56, 74, 0.16);
}

.margin-note {
  position: relative;
  max-width: 520px;
  margin-top: 2rem;
  padding: 1rem 1rem 1rem 1.3rem;
  border-left: 2px solid var(--rust);
  background: rgba(251, 247, 239, 0.55);
}

.note-label {
  display: block;
  margin-bottom: 0.35rem;
  color: var(--ink-blue);
  font-family: var(--mono);
  font-size: 0.64rem;
  letter-spacing: 0.12em;
}

.margin-note p {
  margin-bottom: 0;
  font-family: var(--serif);
  font-size: 0.96rem;
  font-style: italic;
}

.page-art {
  position: relative;
  min-height: 510px;
}

.paper-sheet {
  position: absolute;
  border: 1px solid rgba(44, 45, 42, 0.15);
  box-shadow: var(--shadow);
}

.sheet-back {
  inset: 36px 0 0 56px;
  background: #e7dbc5;
  transform: rotate(3deg);
}

.sheet-front {
  inset: 0 34px 30px 0;
  overflow: hidden;
  background:
    linear-gradient(90deg, transparent 0 76px, rgba(154,93,68,0.18) 76px 77px, transparent 77px),
    linear-gradient(180deg, rgba(37,56,74,0.035) 1px, transparent 1px) 0 0 / 100% 31px,
    var(--offwhite);
}

.sheet-number {
  position: absolute;
  right: 24px;
  top: 20px;
  color: var(--olive);
  font-family: var(--mono);
  font-size: 0.68rem;
}

.sheet-margin {
  position: absolute;
  left: 76px;
  top: 0;
  bottom: 0;
  width: 1px;
  background: rgba(154,93,68,0.18);
}

.sheet-title {
  position: absolute;
  left: 100px;
  top: 64px;
  color: var(--ink-blue);
  font-family: var(--serif);
  font-size: 1.25rem;
  letter-spacing: 0.05em;
}

.text-line {
  position: absolute;
  left: 100px;
  height: 2px;
  background: rgba(37,56,74,0.24);
}

.text-line.long {
  top: 122px;
  width: 62%;
}

.text-line.medium {
  top: 154px;
  width: 48%;
}

.text-line.short {
  top: 186px;
  width: 31%;
}

.text-line.lower {
  top: 300px;
  width: 58%;
}

.text-line.lower-two {
  top: 332px;
  width: 44%;
}

.annotation {
  position: absolute;
  color: var(--rust);
  font-family: var(--mono);
  font-size: 0.62rem;
  letter-spacing: 0.04em;
  transform: rotate(-4deg);
}

.annotation-one {
  left: 28px;
  top: 215px;
  width: 92px;
}

.annotation-two {
  right: 26px;
  top: 252px;
  width: 100px;
  transform: rotate(3deg);
}

.underline {
  position: absolute;
  left: 100px;
  top: 363px;
  width: 39%;
  height: 2px;
  background: var(--rust);
  transform: rotate(-1deg);
}

.corner-code {
  position: absolute;
  right: 24px;
  bottom: 22px;
  color: var(--brown);
  font-family: var(--mono);
  font-size: 0.65rem;
}

.about-section {
  background:
    linear-gradient(90deg, rgba(116,120,102,0.08), transparent 32%),
    var(--offwhite);
}

.about-grid {
  display: grid;
  grid-template-columns: 70px 0.9fr 1.1fr;
  gap: clamp(1.8rem, 4vw, 4rem);
  align-items: start;
}

.section-index {
  color: var(--olive);
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
}

.about-copy {
  padding-top: 1.35rem;
  border-top: 1px solid var(--line);
}

.about-copy p {
  font-size: 1.03rem;
}

.section-heading {
  display: grid;
  grid-template-columns: 70px 1fr;
  gap: clamp(1.8rem, 4vw, 4rem);
  margin-bottom: 2rem;
}

.page-columns {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.page-column {
  position: relative;
  min-height: 300px;
  padding: 1.6rem 1.6rem 1.6rem 4.2rem;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background:
    linear-gradient(90deg, transparent 0 42px, rgba(154,93,68,0.16) 42px 43px, transparent 43px),
    rgba(251, 247, 239, 0.66);
}

.column-page {
  position: absolute;
  left: 12px;
  top: 18px;
  color: var(--olive);
  font-family: var(--mono);
  font-size: 0.62rem;
}

.column-rule {
  position: absolute;
  left: 42px;
  top: 0;
  bottom: 0;
  width: 1px;
  background: rgba(154,93,68,0.16);
}

.column-label {
  display: inline-block;
  margin-bottom: 4rem;
  padding-bottom: 0.25rem;
  border-bottom: 1px solid var(--rust);
  color: var(--rust);
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
}

.page-column p {
  margin-bottom: 2rem;
}

.reference-code {
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: 0.64rem;
  letter-spacing: 0.08em;
}

.notes-section {
  padding-top: 4rem;
  padding-bottom: 4rem;
}

.notes-panel {
  position: relative;
  overflow: hidden;
  padding: clamp(2rem, 5vw, 4rem);
  border: 1px solid rgba(44,45,42,0.14);
  background:
    linear-gradient(90deg, transparent 0 92px, rgba(154,93,68,0.16) 92px 93px, transparent 93px),
    linear-gradient(180deg, rgba(37,56,74,0.04) 1px, transparent 1px) 0 0 / 100% 32px,
    #eee3d0;
}

.notes-heading {
  display: grid;
  grid-template-columns: 70px 1fr;
  gap: clamp(1.8rem, 4vw, 4rem);
  max-width: 800px;
  margin-bottom: 3rem;
}

.notes-heading p:last-child {
  max-width: 650px;
}

.sequence {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1rem;
}

.sequence-item {
  min-height: 175px;
  padding: 1.2rem;
  border: 1px solid rgba(44,45,42,0.12);
  background: rgba(251,247,239,0.74);
}

.sequence-page {
  display: block;
  margin-bottom: 2.2rem;
  color: var(--olive);
  font-family: var(--mono);
  font-size: 0.68rem;
}

.sequence-name {
  display: block;
  font-family: var(--serif);
  font-size: 1.7rem;
}

.sequence-underline {
  display: block;
  width: 62%;
  height: 2px;
  margin: 0.45rem 0 0.85rem;
  background: var(--rust);
  transform: rotate(-1deg);
}

.sequence-note {
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: 0.62rem;
}

.archive-note {
  position: absolute;
  right: 4%;
  top: 10%;
  z-index: 1;
  width: 150px;
  padding: 1rem;
  border: 1px dashed rgba(37,56,74,0.30);
  color: rgba(37,56,74,0.45);
  font-family: var(--mono);
  font-size: 0.62rem;
  text-align: center;
  transform: rotate(5deg);
}

.archive-note strong {
  display: block;
  margin: 0.35rem 0;
  font-family: var(--serif);
  font-size: 1.7rem;
  font-weight: 400;
}

.visit-section {
  background: #e6dbc8;
}

.visit-grid {
  display: grid;
  grid-template-columns: 1fr minmax(320px, 0.8fr);
  gap: clamp(3rem, 7vw, 7rem);
  align-items: center;
}

.visit-copy {
  max-width: 700px;
}

.address-card {
  position: relative;
  display: grid;
  gap: 0.3rem;
  min-height: 280px;
  padding: 2rem 2rem 2rem 4.5rem;
  border: 1px solid rgba(44,45,42,0.15);
  background:
    linear-gradient(90deg, transparent 0 48px, rgba(154,93,68,0.16) 48px 49px, transparent 49px),
    var(--offwhite);
  box-shadow: var(--shadow);
  font-style: normal;
}

.address-note {
  margin-bottom: 3rem;
  color: var(--rust);
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
}

.address-card strong {
  font-family: var(--serif);
  font-size: 1.8rem;
  font-weight: 400;
}

.address-rule {
  width: 100%;
  height: 1px;
  margin: 1.15rem 0 0.35rem;
  background: var(--line);
}

.address-ref {
  color: var(--olive);
  font-family: var(--mono);
  font-size: 0.64rem;
  letter-spacing: 0.08em;
}

.legal-section {
  background: #ddd1bd;
}

.legal-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.legal-card {
  position: relative;
  padding: 2rem 2rem 2rem 3.6rem;
  border: 1px solid rgba(44,45,42,0.12);
  background:
    linear-gradient(90deg, transparent 0 42px, rgba(154,93,68,0.14) 42px 43px, transparent 43px),
    rgba(251,247,239,0.58);
}

.legal-card h2 {
  font-size: clamp(2rem, 3.4vw, 3rem);
}

.legal-card p:last-child {
  margin-bottom: 0;
}

.site-footer {
  padding: 2rem 0;
  border-top: 1px solid rgba(44,45,42,0.13);
  background: #ddd1bd;
}

.footer-grid {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 2rem;
}

.footer-address {
  display: grid;
  gap: 0.12rem;
  font-size: 0.84rem;
}

.footer-address strong {
  margin-bottom: 0.2rem;
  font-family: var(--serif);
  font-size: 1.15rem;
  font-weight: 400;
}

@media (max-width: 960px) {
  .header-inner {
    min-height: auto;
    padding: 1rem 0;
    align-items: flex-start;
    flex-direction: column;
    gap: 0.7rem;
  }

  .hero-grid,
  .visit-grid {
    grid-template-columns: 1fr;
  }

  .page-art {
    min-height: 430px;
  }

  .about-grid {
    grid-template-columns: 56px 1fr;
  }

  .about-copy {
    grid-column: 2;
  }

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

  .sequence {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .archive-note {
    opacity: 0.45;
  }

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

@media (max-width: 700px) {
  .shell {
    width: min(100% - 28px, 1160px);
  }

  .section {
    padding: 4rem 0;
  }

  h1 {
    font-size: clamp(3rem, 15vw, 4.7rem);
  }

  h2 {
    font-size: clamp(2.1rem, 10vw, 3.1rem);
  }

  .hero {
    padding-top: 3rem;
  }

  .page-art {
    min-height: 360px;
  }

  .sheet-back {
    inset: 24px 0 0 34px;
  }

  .sheet-front {
    inset: 0 22px 20px 0;
    background:
      linear-gradient(90deg, transparent 0 58px, rgba(154,93,68,0.18) 58px 59px, transparent 59px),
      linear-gradient(180deg, rgba(37,56,74,0.035) 1px, transparent 1px) 0 0 / 100% 28px,
      var(--offwhite);
  }

  .sheet-margin {
    left: 58px;
  }

  .sheet-title,
  .text-line,
  .underline {
    left: 76px;
  }

  .about-grid,
  .section-heading,
  .notes-heading {
    grid-template-columns: 1fr;
    gap: 0.8rem;
  }

  .about-copy {
    grid-column: auto;
  }

  .page-column {
    min-height: 240px;
  }

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

  .sequence-item {
    min-height: 135px;
  }

  .archive-note {
    right: -20px;
    top: 18px;
    transform: rotate(5deg) scale(0.8);
  }

  .footer-grid {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 480px) {
  .main-nav {
    display: grid;
    grid-template-columns: repeat(3, auto);
    justify-content: start;
    gap: 0.55rem 1rem;
  }

  .main-nav a {
    font-size: 0.74rem;
  }

  .page-art {
    min-height: 330px;
  }

  .sheet-title {
    font-size: 1rem;
  }

  .annotation {
    font-size: 0.56rem;
  }

  .address-card,
  .legal-card,
  .notes-panel {
    padding: 1.35rem 1.35rem 1.35rem 3rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition: none !important;
  }
}