/* ================================================================
   Course to MAST — chart-room theme
   Palette: ink navy / chart paper / sea-glass teal / buoy gold
   ================================================================ */

:root {
  --ink:        #12283a;   /* chart ink — text, headers          */
  --ink-soft:   #3d5468;   /* secondary text                     */
  --paper:      #f2f6f5;   /* chart paper — page background      */
  --paper-deep: #e6edec;   /* panels, code, table stripes        */
  --glass:      #1f6e66;   /* sea-glass teal — links, actions    */
  --glass-deep: #14524c;
  --buoy:       #b9871f;   /* buoy gold — highlights, waypoints  */
  --hairline:   #c7d3d2;   /* rules and borders                  */
  --seal:       #fdfaf2;   /* answer-key envelope interior       */

  --display: "Archivo", "Helvetica Neue", Arial, sans-serif;
  --body:    "Source Serif 4", Georgia, serif;
  --utility: "IBM Plex Mono", "Courier New", monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation: none !important; transition: none !important; }
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--body);
  font-size: 1.0625rem;
  line-height: 1.65;
}

/* ---------------- layout: chart = sidebar + page ---------------- */

.chart {
  display: grid;
  grid-template-columns: 264px minmax(0, 1fr);
  min-height: 100vh;
}

.page {
  max-width: 46rem;
  padding: 3rem 3rem 4rem;
}

/* ---------------- sidebar: the course plot ---------------- */

.plot {
  border-right: 1px solid var(--hairline);
  padding: 2rem 1.25rem 2rem 1.5rem;
  position: sticky;
  top: 0;
  align-self: start;
  height: 100vh;
  overflow-y: auto;
  background:
    linear-gradient(var(--paper), var(--paper)) padding-box;
}

.plot-flag {
  display: block;
  text-decoration: none;
  color: var(--ink);
  margin-bottom: 2rem;
}
.plot-flag-eyebrow {
  display: block;
  font-family: var(--utility);
  font-size: 0.6875rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--glass);
}
.plot-flag-title {
  display: block;
  font-family: var(--display);
  font-weight: 900;
  font-stretch: 112%;
  font-size: 1.75rem;
  line-height: 1.02;
  letter-spacing: -0.01em;
  margin-top: 0.35rem;
  text-transform: uppercase;
}

/* the plotted route: dashed line joining waypoint dots */
.route ol {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}
.route ol::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 14px;
  bottom: 14px;
  border-left: 2px dashed var(--hairline);
}
.waypoint { position: relative; }
.waypoint a {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  padding: 0.45rem 0.5rem 0.45rem 0;
  text-decoration: none;
  color: var(--ink-soft);
}
.waypoint a:hover .wp-name { color: var(--glass-deep); }
.wp-index {
  flex: 0 0 20px;
  width: 20px; height: 20px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--hairline);
  color: var(--ink-soft);
  font-family: var(--utility);
  font-size: 0.6875rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  position: relative;
  z-index: 1;
}
.wp-name {
  font-family: var(--display);
  font-weight: 600;
  font-size: 0.8125rem;
  letter-spacing: 0.02em;
  line-height: 1.3;
}
.waypoint.here .wp-index {
  background: var(--buoy);
  border-color: var(--buoy);
  color: #fff;
}
.waypoint.here .wp-name { color: var(--ink); }
.waypoint.here a::after {
  content: "you are here";
  font-family: var(--utility);
  font-size: 0.5625rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--buoy);
  margin-left: auto;
}

/* ---------------- exam timer ---------------- */

.timer {
  margin-top: 2rem;
  border: 1px solid var(--hairline);
  border-radius: 6px;
  padding: 0.9rem;
  background: #fff;
}
.timer-label {
  font-family: var(--utility);
  font-size: 0.625rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-soft);
}
.timer-clock {
  display: block;
  font-family: var(--utility);
  font-size: 2rem;
  font-weight: 600;
  margin: 0.25rem 0 0.6rem;
  font-variant-numeric: tabular-nums;
}
.timer.done .timer-clock { color: #a03123; }
.timer-presets, .timer-run { display: flex; gap: 0.4rem; }
.timer-presets { margin-bottom: 0.4rem; }
.timer button {
  font-family: var(--utility);
  font-size: 0.75rem;
  padding: 0.3rem 0;
  flex: 1;
  border: 1px solid var(--hairline);
  border-radius: 4px;
  background: var(--paper);
  color: var(--ink);
  cursor: pointer;
}
.timer button:hover { border-color: var(--glass); color: var(--glass-deep); }
.timer button:focus-visible,
a:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--glass);
  outline-offset: 2px;
}
.timer-run #timer-start {
  background: var(--glass);
  border-color: var(--glass);
  color: #fff;
  font-weight: 600;
}
.timer-run #timer-start:hover { background: var(--glass-deep); color: #fff; }
.timer-presets button.active { border-color: var(--buoy); color: var(--buoy); font-weight: 600; }

.plot-note {
  margin-top: 1.5rem;
  font-family: var(--body);
  font-size: 0.75rem;
  line-height: 1.5;
  color: var(--ink-soft);
}

/* ---------------- content typography ---------------- */

.page h1 {
  font-family: var(--display);
  font-weight: 900;
  font-stretch: 108%;
  font-size: clamp(1.9rem, 4vw, 2.6rem);
  line-height: 1.05;
  letter-spacing: -0.015em;
  margin: 0 0 0.75rem;
  text-transform: uppercase;
}
.page h1 + h3, .page h1 + p > strong:first-child { color: var(--ink-soft); }

.page h2 {
  font-family: var(--display);
  font-weight: 800;
  font-size: 1.3rem;
  letter-spacing: 0.01em;
  margin: 2.5rem 0 0.75rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--hairline);
}
.page h3 {
  font-family: var(--display);
  font-weight: 700;
  font-size: 1.05rem;
  margin: 1.75rem 0 0.5rem;
}
.page h2 > em, .page h3 > em { font-style: normal; color: var(--glass); }

.page a { color: var(--glass); text-decoration-thickness: 1px; text-underline-offset: 2px; }
.page a:hover { color: var(--glass-deep); }

.page hr {
  border: 0;
  border-top: 1px solid var(--hairline);
  margin: 2.25rem 0;
}

.page strong { font-weight: 700; }
.page blockquote {
  margin: 1.25rem 0;
  padding: 0.25rem 1.1rem;
  border-left: 3px solid var(--buoy);
  color: var(--ink-soft);
}

.page ul, .page ol { padding-left: 1.4rem; }
.page li { margin: 0.3rem 0; }

.page table {
  border-collapse: collapse;
  width: 100%;
  margin: 1.25rem 0;
  font-size: 0.95rem;
}
.page th {
  font-family: var(--display);
  font-weight: 700;
  text-align: left;
  font-size: 0.8125rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
.page th, .page td {
  border-bottom: 1px solid var(--hairline);
  padding: 0.55rem 0.75rem 0.55rem 0;
  vertical-align: top;
}
.page tbody tr:nth-child(even) { background: var(--paper-deep); }

.page code {
  font-family: var(--utility);
  font-size: 0.875em;
  background: var(--paper-deep);
  padding: 0.1em 0.35em;
  border-radius: 3px;
}

/* ---------------- sealed answer keys ---------------- */

details.answer-seal {
  margin: 1.75rem 0 2rem;
  border: 1px solid var(--buoy);
  border-radius: 6px;
  background: var(--seal);
  overflow: hidden;
}
details.answer-seal > summary {
  cursor: pointer;
  list-style: none;
  padding: 0.85rem 1.1rem;
  font-family: var(--display);
  font-weight: 700;
  font-size: 0.9375rem;
  letter-spacing: 0.03em;
  color: var(--glass-deep);
  display: flex;
  align-items: center;
  gap: 0.6rem;
  user-select: none;
}
details.answer-seal > summary::-webkit-details-marker { display: none; }
details.answer-seal > summary::before {
  content: "";
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--buoy);
  flex: 0 0 10px;
  transition: transform 0.15s ease;
}
details.answer-seal[open] > summary::before { transform: scale(0.6); }
details.answer-seal > summary::after {
  content: "sealed — click to open";
  margin-left: auto;
  font-family: var(--utility);
  font-weight: 400;
  font-size: 0.625rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-soft);
}
details.answer-seal[open] > summary::after { content: "click to reseal"; }
details.answer-seal > .seal-body {
  padding: 0 1.1rem 1rem;
  border-top: 1px dashed var(--hairline);
}

/* ---------------- footer ---------------- */

.page-foot {
  margin-top: 3.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--hairline);
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  font-family: var(--utility);
  font-size: 0.6875rem;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
}

/* ---------------- home page course plot ---------------- */

.home-hero { margin-bottom: 2.5rem; }
.home-hero .eyebrow {
  font-family: var(--utility);
  font-size: 0.75rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--glass);
}
.legs {
  list-style: none;
  padding: 0;
  margin: 1.5rem 0;
  display: grid;
  gap: 0.5rem;
}
.legs a {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  padding: 0.9rem 1rem;
  border: 1px solid var(--hairline);
  border-radius: 6px;
  background: #fff;
  text-decoration: none;
  color: var(--ink);
}
.legs a:hover { border-color: var(--glass); }
.legs .leg-no {
  font-family: var(--utility);
  font-size: 0.75rem;
  color: var(--buoy);
  font-weight: 600;
  flex: 0 0 1.5rem;
}
.legs .leg-name { font-family: var(--display); font-weight: 700; }
.legs .leg-desc { margin-left: auto; font-size: 0.85rem; color: var(--ink-soft); text-align: right; }

/* ---------------- responsive ---------------- */

@media (max-width: 880px) {
  .chart { grid-template-columns: 1fr; }
  .plot {
    position: static;
    height: auto;
    border-right: 0;
    border-bottom: 1px solid var(--hairline);
    padding: 1.5rem 1.25rem;
  }
  .route ol { display: grid; grid-template-columns: 1fr 1fr; }
  .route ol::before { display: none; }
  .waypoint.here a::after { display: none; }
  .page { padding: 2rem 1.25rem 3rem; }
  .legs .leg-desc { display: none; }
}

/* ---------------- print: tests on paper, keys open, chrome hidden ---------------- */

@media print {
  .plot, .page-foot, .timer { display: none !important; }
  .chart { display: block; }
  .page { max-width: none; padding: 0; }
  body { background: #fff; color: #000; font-size: 11pt; }
  details.answer-seal { border: 1px solid #999; page-break-before: always; }
  details.answer-seal > summary::after { content: ""; }
  a { color: #000; text-decoration: none; }
}