/* Tidewrack Charts: shared stylesheet */
:root {
  color-scheme: light dark;
  --sheet: #e4ede8;
  --shoal: #c9e0e6;
  --shoal2: #a6cbd8;
  --land: #efe3bd;
  --ink: #1a2142;
  --muted: #46506b;
  --mag: #b3206a;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
  --sans: "Gill Sans", "Gill Sans MT", Optima, Candara, "Segoe UI", Calibri, sans-serif;
  --gutter: clamp(1.25rem, 4vw, 3rem);
  --measure: 62ch;
}

@media (prefers-color-scheme: dark) {
  :root {
    --sheet: #0e1730;
    --shoal: #16294d;
    --shoal2: #21416b;
    --land: #3b3a52;
    --ink: #e6eef0;
    --muted: #a9b6cc;
    --mag: #ff86bd;
  }
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--sheet);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1.0625rem;
  line-height: 1.65;
}

main { flex: 1; }
img, svg { max-width: 100%; }

a { color: var(--mag); text-decoration-thickness: 0.08em; text-underline-offset: 0.2em; }
a:hover { text-decoration-thickness: 0.16em; }
:focus-visible { outline: 3px solid var(--mag); outline-offset: 3px; }

.skip {
  position: absolute;
  left: var(--gutter);
  top: -5rem;
  z-index: 10;
  padding: 0.6rem 1rem;
  background: var(--ink);
  color: var(--sheet);
}
.skip:focus { top: 0.5rem; }

h1, h2, h3 {
  margin: 0 0 0.5em;
  font-family: var(--serif);
  font-style: italic;
  font-weight: 400;
  line-height: 1.08;
  letter-spacing: -0.01em;
}
h1 { font-size: clamp(2.75rem, 7.2vw, 5.6rem); letter-spacing: -0.025em; }
h2 { font-size: clamp(1.9rem, 4vw, 2.9rem); }
h3 { font-size: clamp(1.35rem, 2.4vw, 1.7rem); }
p { max-width: var(--measure); margin: 0 0 1em; }

.wrap { width: min(100% - 2 * var(--gutter), 74rem); margin-inline: auto; }
.lede { max-width: 38ch; font-size: 1.25rem; line-height: 1.55; }
.small { font-size: 0.9rem; color: var(--muted); }

/* Header, footer, graduated scale bar */
.site-head { padding-block: 1.1rem; }
.site-head .wrap {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem 2rem;
}
.mark {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  color: var(--ink);
  text-decoration: none;
  font-family: var(--serif);
  font-style: italic;
  font-size: 1.65rem;
  letter-spacing: -0.01em;
}
.mark img { display: block; width: 2.2rem; height: 2.2rem; }

.nav ul, .foot-nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.75rem;
  margin: 0;
  padding: 0;
  list-style: none;
}
.nav a, .foot-nav a {
  padding-block: 0.35rem;
  border-bottom: 2px solid transparent;
  color: var(--ink);
  font-weight: 500;
  text-decoration: none;
}
.nav a:hover, .foot-nav a:hover { border-bottom-color: var(--ink); }
.nav a[aria-current="page"] { color: var(--mag); border-bottom-color: var(--mag); }

.scale {
  height: 0.7rem;
  border-block: 1px solid var(--ink);
  background: repeating-linear-gradient(90deg, var(--ink) 0 1.5rem, var(--sheet) 1.5rem 3rem);
}

.site-foot { margin-top: clamp(3rem, 7vw, 5rem); }
.site-foot .wrap {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 1.5rem 3rem;
  padding-block: 2rem 2.5rem;
}
.foot-name { margin-bottom: 0.4em; font: italic 1.5rem/1.1 var(--serif); }

/* Buttons */
.actions { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-top: 1.75rem; }
.btn {
  display: inline-block;
  padding: 0.7em 1.3em;
  border: 1.5px solid var(--ink);
  color: var(--ink);
  font-weight: 600;
  text-decoration: none;
}
.btn:hover { background: var(--ink); color: var(--sheet); }
.btn-primary { background: var(--mag); border-color: var(--mag); color: var(--sheet); }
.btn-primary:hover { background: var(--ink); border-color: var(--ink); color: var(--sheet); }

/* Hero */
.hero { padding-block: clamp(2rem, 6vw, 4.5rem); }
.hero .wrap {
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
}

/* Chart frames: double neatline */
.chart { margin: 0; padding: 6px; border: 1px solid var(--ink); background: var(--sheet); }
.chart svg { display: block; width: 100%; height: auto; border: 1px solid var(--ink); }
.chart figcaption { padding: 0.5rem 0.25rem 0.1rem; font: italic 0.95rem/1.4 var(--serif); color: var(--muted); }

/* SVG chart vocabulary */
.deep { fill: var(--sheet); }
.w1 { fill: var(--shoal); }
.w3 { fill: var(--shoal2); }
.land { fill: var(--land); stroke: var(--ink); stroke-width: 1.6; }
.line { fill: none; stroke: var(--ink); stroke-width: 1; }
.edge { stroke: var(--ink); stroke-width: 1; }
.dash { stroke-dasharray: 4 3; }
.line-m { fill: none; stroke: var(--mag); stroke-width: 1.8; }
.fill-m { fill: var(--mag); }
.ring-m { fill: none; stroke: var(--mag); stroke-width: 1.2; }
.star { fill: var(--ink); }
.snd { font-family: var(--serif); font-style: italic; font-size: 12px; fill: var(--ink); }
.nm { font-family: var(--serif); font-style: italic; font-size: 19px; fill: var(--ink); letter-spacing: 0.04em; }
.nm-sm { font-family: var(--serif); font-style: italic; font-size: 11px; fill: var(--ink); letter-spacing: 0.03em; }
.nm-m { font-family: var(--serif); font-style: italic; font-size: 11px; fill: var(--mag); }
.needle { transform-box: fill-box; transform-origin: center; transform: rotate(var(--turn, 0deg)); transition: transform 0.35s cubic-bezier(0.2, 0.7, 0.2, 1); }
.needle-n { fill: var(--mag); }
.needle-s { fill: var(--ink); }

/* Shoal band with scalloped shoreline */
.band {
  position: relative;
  margin-top: 12px;
  padding-block: clamp(3rem, 7vw, 5.5rem);
  background: var(--shoal);
}
.band::before {
  content: "";
  position: absolute;
  top: -12px;
  left: 0;
  right: 0;
  height: 12px;
  background: radial-gradient(circle at 12px 12px, var(--shoal) 11.5px, transparent 12px) 0 0 / 24px 12px repeat-x;
}
.section { padding-block: clamp(3rem, 7vw, 5rem); }

/* Home: what we chart, then-and-now */
.specs { display: grid; margin: 2rem 0 0; }
.specs > div {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: 1rem 2.5rem;
  padding-block: 1.5rem;
  border-top: 1.5px dashed var(--ink);
}
.specs dt { font: italic 400 clamp(1.6rem, 3vw, 2.2rem) / 1.1 var(--serif); }
.specs dd { max-width: 52ch; margin: 0; }

.split {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
}

/* Page heads */
.page-head { padding-block: clamp(2.5rem, 6vw, 4.5rem) clamp(1.5rem, 3vw, 2.5rem); }
.page-head h1 { font-size: clamp(2.6rem, 6vw, 4.5rem); }

/* Plates */
.plates { display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); gap: 3rem 2rem; }
.plate { margin: 0; }
.plate:nth-child(1) { grid-column: span 4; }
.plate:nth-child(2) { grid-column: span 2; }
.plate:nth-child(3) { grid-column: span 2; }
.plate:nth-child(4) { grid-column: span 4; }
.plate:nth-child(5), .plate:nth-child(6) { grid-column: span 3; }
.plate .chart figcaption { display: none; }
.plate-title { margin: 0.9rem 0 0.1rem; font: italic 400 1.6rem/1.15 var(--serif); }
.plate-spec { margin: 0 0 0.4rem; font-size: 0.9rem; color: var(--muted); }
.plate details { max-width: 56ch; }
.plate summary { cursor: pointer; color: var(--mag); font-weight: 600; }
.plate details p { margin-top: 0.5rem; }

/* Process */
.steps { margin: 2rem 0; padding: 0; list-style: none; counter-reset: step; }
.steps li {
  display: grid;
  grid-template-columns: 4.5rem minmax(0, 1fr);
  gap: 1rem 2rem;
  padding-block: 1.75rem;
  border-top: 1.5px dashed var(--ink);
  counter-increment: step;
}
.steps li::before { content: counter(step); font: italic 400 3.5rem/1 var(--serif); color: var(--mag); }
.steps h3 { margin-bottom: 0.3em; }
.steps p { margin-bottom: 0; }

/* Visit */
.cols { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 3rem clamp(2rem, 6vw, 5rem); }
.hours { width: 100%; max-width: 26rem; border-collapse: collapse; }
.hours caption { padding-bottom: 0.5rem; text-align: left; font: italic 400 1.6rem/1.2 var(--serif); }
.hours th, .hours td { padding: 0.55rem 0; border-top: 1px dashed var(--ink); text-align: left; font-weight: 400; }
.hours th { font-weight: 600; }
address { font-style: normal; }

/* 404 */
.lost { display: grid; grid-template-columns: minmax(0, 7fr) minmax(0, 4fr); gap: 3rem; align-items: center; padding-block: clamp(3rem, 8vw, 6rem); }
.lost .chart { max-width: 22rem; }

@media (max-width: 52rem) {
  .hero .wrap, .split, .cols, .lost, .specs > div, .site-foot .wrap { grid-template-columns: minmax(0, 1fr); }
  .plate:nth-child(n) { grid-column: 1 / -1; }
  .steps li { grid-template-columns: 3rem minmax(0, 1fr); gap: 0.75rem 1rem; }
  .steps li::before { font-size: 2.6rem; }
}

@media (prefers-reduced-motion: reduce) {
  .needle { transition: none; }
}