/* ==========================================================
   CODEX — shared stylesheet for martinaparra.org
   Renaissance engineer's notebook: sepia ink, red chalk, paper
   ========================================================== */

:root {
  --paper:      #ece0c4;
  --paper-deep: #dccb9f;
  --ink:        #3b2a1c;
  --ink-faded:  #6f5a45;
  --sanguine:   #9c4a2c;
  --rule:       rgba(59, 42, 28, .14);

  --serif: 'IM Fell English', 'Iowan Old Style', Georgia, serif;
  --hand:  'La Belle Aurore', 'Segoe Script', cursive;

  --measure: 34rem;
}

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

html { background: #2a1d12; }

body {
  font-family: var(--serif);
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--ink);
  min-height: 100vh;
  padding: clamp(12px, 3vw, 40px);
}

/* ---------- the sheet ---------- */
.sheet {
  max-width: 1080px;
  margin: 0 auto;
  position: relative;
  isolation: isolate;
  padding: 0 clamp(22px, 6vw, 72px) 48px;
}

/* paper lives on a pseudo-layer so its edges can be torn by the #rough filter */
.sheet::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background-color: var(--paper);
  background-image:
    radial-gradient(ellipse 60% 40% at 8% 6%,  rgba(140, 95, 40, .18), transparent 70%),
    radial-gradient(ellipse 50% 35% at 94% 92%, rgba(140, 95, 40, .22), transparent 70%),
    radial-gradient(circle at 78% 14%, rgba(120, 80, 30, .10) 0 2%, transparent 3%),
    radial-gradient(circle at 18% 71%, rgba(120, 80, 30, .08) 0 1.5%, transparent 2.5%),
    radial-gradient(ellipse at center, transparent 55%, rgba(90, 60, 25, .28) 100%),
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='240' height='240'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='3' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 .35 0 0 0 0 .25 0 0 0 0 .12 0 0 0 .09 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  box-shadow: inset 0 0 28px rgba(110, 70, 25, .45), inset 0 0 4px rgba(80, 50, 20, .5);
  filter: url(#rough) drop-shadow(0 22px 40px rgba(0, 0, 0, .55));
}

/* ---------- navigation ---------- */
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px 28px;
  padding: 26px 0 18px;
  border-bottom: 1px solid var(--rule);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 14px;
  text-decoration: none;
  color: var(--ink);
}
.nav-brand img {
  width: 52px; height: 52px;
  border-radius: 50%;
  filter: sepia(.35) saturate(.8);
}
.nav-brand span { font-size: 1.35rem; letter-spacing: .01em; }

.nav ul { display: flex; flex-wrap: wrap; gap: 4px 22px; list-style: none; }
.nav a {
  color: var(--ink-faded);
  text-decoration: none;
  font-style: italic;
  padding: 2px 0;
  border-bottom: 1px solid transparent;
}
.nav a:hover { color: var(--ink); border-bottom-color: var(--sanguine); }
.nav a[aria-current="page"] { color: var(--sanguine); }

a:focus-visible { outline: 2px dashed var(--sanguine); outline-offset: 4px; }

/* ---------- folio page layout: text + margin ---------- */
.folio {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 13rem;
  gap: 0 3rem;
  padding: 56px 0;
  border-bottom: 1px solid var(--rule);
}
.folio:last-of-type { border-bottom: 0; }

.folio-mark {
  font-family: var(--hand);
  color: var(--ink-faded);
  font-size: 1rem;
}

.marginalia {
  font-family: var(--hand);
  font-size: 1.05rem;
  line-height: 1.5;
  color: var(--ink-faded);
  padding-top: .4rem;
  transform: rotate(-2deg);
}
.marginalia p + p { margin-top: 1.2rem; }
.mirror { display: inline-block; transform: scaleX(-1); }

h1, h2, h3 { font-weight: 400; line-height: 1.15; }

h2 {
  font-size: clamp(1.7rem, 3.2vw, 2.3rem);
  margin: .3rem 0 1.1rem;
}
h3 { font-size: 1.3rem; margin-bottom: .4rem; }

p { max-width: var(--measure); }
p + p { margin-top: 1rem; }

.text-link {
  color: var(--sanguine);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}
.text-link:hover { color: var(--ink); }

/* ---------- footer ---------- */
.colophon {
  margin-top: 8px;
  padding-top: 24px;
  border-top: 1px solid var(--rule);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px 32px;
  font-size: .9rem;
  color: var(--ink-faded);
}
.colophon a { color: var(--ink-faded); }

/* ---------- sepia line drawings ---------- */
.drawing { width: 100%; height: auto; display: block; }
.drawing .ink   { fill: none; stroke: var(--ink); stroke-width: 1.4; stroke-linecap: round; stroke-linejoin: round; }
.drawing .thin  { fill: none; stroke: var(--ink-faded); stroke-width: .7; stroke-linecap: round; }
.drawing .chalk { fill: none; stroke: var(--sanguine); stroke-width: 1.2; stroke-linecap: round; }
.drawing .chalk-fill { fill: var(--sanguine); }
.drawing .hatch   { fill: url(#hatch);   stroke: none; }
.drawing .hatch-x { fill: url(#hatch-x); stroke: none; }
.drawing .shade   { fill: var(--ink-faded); opacity: .4; stroke: none; }
.drawing .flow    { fill: none; stroke: var(--sanguine); stroke-width: 1.3; stroke-linecap: round; stroke-dasharray: 5 9; animation: flow 1.6s linear infinite; }
.drawing text { font-family: var(--hand); fill: var(--ink-faded); font-size: 15px; }
.drawing text.red { fill: var(--sanguine); }

/* one orchestrated moment: the drawing is traced on load */
.trace .ink, .trace .thin, .trace .chalk {
  stroke-dasharray: 1400;
  stroke-dashoffset: 1400;
  animation: trace 3.2s ease-out forwards;
}
.trace .thin  { animation-delay: .9s; }
.trace .chalk { animation-delay: 1.8s; }
.trace text, .trace .chalk-fill { opacity: 0; animation: appear 1s ease-out 2.6s forwards; }

@keyframes trace  { to { stroke-dashoffset: 0; } }
@keyframes flow   { to { stroke-dashoffset: -28; } }
@keyframes spin   { to { transform: rotate(360deg); } }
@keyframes sway   { 0%, 100% { transform: rotate(-4deg); } 50% { transform: rotate(4deg); } }
@keyframes swing  { 0%, 100% { transform: rotate(-7deg); } 50% { transform: rotate(7deg); } }

.drawing .spin, .drawing .spin-slow, .drawing .swing { transform-box: view-box; }
.drawing .spin      { animation: spin 9s linear infinite; }
.drawing .leaf      { fill: none; stroke: #5b6a3a; stroke-width: .9; stroke-linecap: round; opacity: .85; }
.drawing .sway      { transform-box: view-box; animation: sway 4.5s ease-in-out infinite; }
.drawing .swing-slow{ transform-box: view-box; animation: swing 9s ease-in-out infinite; }
.drawing .flow-soft { fill: none; stroke: var(--sanguine); stroke-width: .9; stroke-dasharray: 4 6; opacity: .8; animation: flow 3s linear infinite; }
.drawing .spin-slow { animation: spin 24s linear infinite; }
.drawing .swing     { animation: swing 5s ease-in-out infinite; }

.trace .hatch, .trace .hatch-x, .trace .shade, .trace .flow { opacity: 0; animation: appear 1.2s ease-out 2.2s forwards, flow 1.6s linear infinite; }
.trace .hatch, .trace .hatch-x { animation: appear 1.2s ease-out 1.6s forwards; }
.trace .leaf { opacity: 0; animation: appear 1.4s ease-out 2.4s forwards; }
.trace .shade { animation: appear-shade 1.2s ease-out 1.6s forwards; }
@keyframes appear-shade { to { opacity: .4; } }
@keyframes appear { to { opacity: 1; } }

@media (prefers-reduced-motion: reduce) {
  .trace .ink, .trace .thin, .trace .chalk { animation: none; stroke-dashoffset: 0; }
  .trace text, .trace .chalk-fill, .trace .hatch, .trace .hatch-x, .trace .flow { animation: none; opacity: 1; }
  .trace .shade { animation: none; opacity: .4; }
  .trace .leaf { animation: none; opacity: .85; }
  .drawing .flow, .drawing .flow-soft, .drawing .spin, .drawing .spin-slow, .drawing .swing, .drawing .swing-slow, .drawing .sway { animation: none; }
}

/* ---------- responsive ---------- */
@media (max-width: 780px) {
  body { font-size: 1.05rem; }
  .folio { grid-template-columns: 1fr; padding: 40px 0; }
  .marginalia { transform: none; margin-top: 1.6rem; padding-left: 1rem; border-left: 1px solid var(--sanguine); }
}