:root {
  --paper: #f3efe4;
  --card: #fffaf2;
  --ink: #1c2430;
  --muted: #5d675f;
  --line: #ddd4c3;
  --teal: #0f5c56;
  --teal-deep: #0a3d39;
  --focus: #9a3412;
  --empty: #e6e0d4;
  color: var(--ink);
  font-family: "Segoe UI", system-ui, sans-serif;
  line-height: 1.5;
}

* { box-sizing: border-box; }

[hidden] { display: none !important; }

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(900px 320px at 0% -10%, #e5f3ef, transparent 60%),
    var(--paper);
  color: var(--ink);
}

body.tray-open { overflow: hidden; }

.skip {
  position: absolute;
  left: 0.75rem;
  top: -3rem;
  background: var(--ink);
  color: white;
  padding: 0.4rem 0.7rem;
  z-index: 20;
}

.skip:focus { top: 0.75rem; }

.site-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem 1rem;
  padding: 0.75rem 1.1rem;
  border-bottom: 1px solid var(--line);
  background: rgb(255 250 242 / 92%);
  position: sticky;
  top: 0;
  z-index: 3;
}

.brand {
  font-family: Georgia, "Iowan Old Style", Palatino, serif;
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--teal-deep);
  text-decoration: none;
}

.site-header nav {
  flex: 1 1 20rem;
  min-width: 0;
}

nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

nav a,
.table-btn,
.trend,
#close-tray,
.term-btn,
.card-controls button,
.sync-actions button,
.lesson-list button,
.answer-row button,
.term-popup button {
  min-height: 44px;
  border-radius: 999px;
}

nav a {
  display: inline-flex;
  align-items: center;
  padding: 0.35rem 0.8rem;
  color: var(--ink);
  text-decoration: none;
}

nav a[aria-current="page"] {
  background: var(--teal);
  color: white;
}

.table-btn,
.trend,
#close-tray,
.term-btn,
.card-controls button,
.sync-actions button,
.lesson-list button,
.answer-row button,
.term-popup button {
  border: 1px solid var(--teal);
  background: white;
  color: var(--teal-deep);
  font: inherit;
  padding: 0.35rem 0.9rem;
  cursor: pointer;
}

.table-btn {
  background: var(--teal);
  color: white;
}

.site-header .table-btn { margin-left: auto; }

.page {
  max-width: 44rem;
  margin: 0 auto;
  padding: 1.6rem 1.15rem 3rem;
}

h1, h2 {
  font-family: Georgia, "Iowan Old Style", Palatino, serif;
  line-height: 1.15;
  font-weight: 700;
}

h1 { font-size: clamp(2rem, 5vw, 2.7rem); margin: 0 0 0.6rem; }

.kicker {
  margin: 0;
  color: var(--focus);
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-size: 0.78rem;
}

.route-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(9.5rem, 1fr));
  gap: 0.7rem;
  margin: 1.2rem 0;
}

.route-card {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  min-height: 5.2rem;
  padding: 0.85rem 0.9rem;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 0.9rem;
  color: inherit;
  text-decoration: none;
}

.route-card span { color: var(--muted); font-size: 0.92rem; }

.route-card:hover { border-color: var(--teal); }

ul.lesson-list { list-style: none; }

.lesson-list li {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem 0.75rem;
  padding: 0.35rem 0;
}

.lesson-list, .problem {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 0.9rem;
  padding: 0.85rem 0.95rem;
  margin: 0.8rem 0;
}

.lesson-list a { color: var(--teal-deep); font-weight: 700; }

.lesson-list a[data-practice] {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0.2rem 0.75rem;
  border: 1px solid var(--teal);
  border-radius: 999px;
  background: white;
}

.answer-field { display: flex; flex-direction: column; gap: 0.25rem; }

.answer-label { display: block; font-weight: 700; }

.answer-row { display: flex; flex-wrap: wrap; gap: 0.75rem; align-items: end; }
.answer-row .unit-input { max-width: 8rem; }

.answer-row input {
  font: inherit;
  min-height: 44px;
  min-width: 12rem;
  padding: 0.35rem 0.6rem;
  border: 1px solid var(--line);
  border-radius: 0.6rem;
  background: white;
}

.feedback { min-height: 1.4rem; margin: 0.4rem 0 0; font-weight: 700; }

.feedback[data-status="correct"] { color: var(--teal-deep); }

.feedback[data-status="sig"],
.feedback[data-status="unit"],
.feedback[data-status="miss"],
.feedback[data-status="near"],
.feedback[data-status="solution"] { color: var(--focus); }

.site-footer {
  max-width: 44rem;
  margin: 0 auto;
  padding: 0 1.15rem 2rem;
  color: var(--muted);
  font-size: 0.92rem;
}

.tray-backdrop {
  position: fixed;
  inset: 0;
  background: rgb(20 28 26 / 46%);
  z-index: 10;
}

.tray {
  position: fixed;
  z-index: 11;
  top: 0;
  right: 0;
  width: min(1080px, 100%);
  height: 100%;
  overflow: auto;
  background: var(--card);
  box-shadow: -12px 0 32px rgb(20 28 26 / 16%);
  padding: 0.9rem 1rem 1.5rem;
}

.tray-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  position: sticky;
  top: 0;
  background: var(--card);
  padding-bottom: 0.4rem;
  z-index: 1;
}

.tray-bar h2 { margin: 0; font-size: 1.45rem; }

.trend-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 0.4rem 0 0.2rem;
}

.trend[aria-pressed="true"] {
  background: var(--teal-deep);
  color: white;
  border-color: var(--teal-deep);
}

.trend-blurb,
.detail,
.fine,
.f-caption { margin: 0.45rem 0; }

.detail { font-weight: 600; }

.fine,
.f-caption { color: var(--muted); font-size: 0.92rem; }

.legend {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  max-width: 18rem;
  color: var(--muted);
  font-size: 0.85rem;
}

.legend-bar {
  flex: 1;
  height: 0.7rem;
  border-radius: 999px;
  background: linear-gradient(90deg, #dbeafe, #fde68a, #c2410c);
}

.table-scroll { overflow-x: auto; padding-bottom: 0.4rem; }

.ptable {
  display: grid;
  grid-template-columns: repeat(18, 2.7rem);
  grid-auto-rows: 2.7rem;
  gap: 3px;
  width: max-content;
  margin-top: 0.4rem;
}

.ptable.fblock { grid-template-columns: repeat(15, 2.7rem); }

.el {
  border: 0;
  border-radius: 5px;
  padding: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  line-height: 1;
  font: inherit;
}

.el .z { font-size: 0.7rem; opacity: 1; }
.el .sym { font-size: 0.86rem; font-weight: 700; margin-top: 0.12rem; }

.el.is-empty { background: var(--empty); color: var(--ink); }

.el[aria-pressed="true"] { box-shadow: inset 0 0 0 2px var(--ink); }

.marker {
  display: grid;
  place-items: center;
  font-size: 0.62rem;
  color: var(--muted);
  border: 1px dashed var(--line);
  border-radius: 5px;
}

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

.final-ch { margin-top: 1.4rem; }

.final-ch h2 { font-size: 1.35rem; margin-bottom: 0.4rem; }

.final-q {
  margin: 1rem 0;
  padding-top: 0.8rem;
  border-top: 1px solid var(--line);
}

.answer-label {
  display: block;
  font-weight: 700;
  margin: 0.45rem 0 0.25rem;
}

.final-q input {
  width: min(100%, 22rem);
  font: inherit;
  padding: 0.4rem 0.55rem;
  border: 1px solid var(--line);
  border-radius: 0.45rem;
  background: white;
}

.feedback { margin: 0.8rem 0; }

.correction {
  margin: 0.9rem 0;
  padding: 0.75rem 0.85rem;
  border: 1px solid var(--line);
  border-radius: 0.7rem;
  background: var(--card);
}

.correction.is-miss { border-color: #b45309; }

.correction.is-correct { border-color: var(--teal); }

.steps { margin: 0.4rem 0 0; padding-left: 1.2rem; }


.site-nav-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
  list-style: none;
  margin: 0;
  padding: 0;
  align-items: center;
}

.nav-group-label {
  list-style: none;
  padding: 0.35rem 0.35rem 0.35rem 0.15rem;
  color: var(--teal-deep);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.nav-more {
  position: relative;
  list-style: none;
}

.nav-more-btn {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  min-width: 44px;
  padding: 0.35rem 0.8rem;
  border: 1px solid var(--teal);
  border-radius: 999px;
  background: white;
  color: var(--teal-deep);
  font: inherit;
  cursor: pointer;
}

.nav-more-btn--active,
.nav-more-btn[aria-expanded="true"] {
  background: var(--teal);
  color: white;
}

.nav-more-panel {
  position: absolute;
  top: calc(100% + 0.35rem);
  right: 0;
  z-index: 4;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  min-width: 11rem;
  margin: 0;
  padding: 0.45rem;
  list-style: none;
  border: 1px solid var(--line);
  border-radius: 0.85rem;
  background: rgb(255 250 242 / 98%);
  box-shadow: 0 0.6rem 1.4rem rgb(20 40 40 / 12%);
}

.nav-more-panel[hidden] {
  display: none;
}

.nav-more-panel a {
  display: flex;
  align-items: center;
  min-height: 44px;
  width: 100%;
  padding: 0.35rem 0.8rem;
  border-radius: 999px;
}

@media (max-width: 599px) {
  .site-header {
    flex-wrap: nowrap;
    gap: 0.5rem;
  }

  .site-header nav {
    flex: 1 1 auto;
    min-width: 0;
  }

  .site-nav-list {
    flex-wrap: nowrap;
    gap: 0.15rem;
  }

  .nav-group-label {
    display: none;
  }

  .site-nav-list a,
  .nav-more-btn {
    padding: 0.35rem 0.55rem;
    font-size: 0.92rem;
  }

  .site-header .table-btn {
    flex: 0 0 auto;
    margin-left: 0;
    padding: 0.35rem 0.55rem;
    font-size: 0.85rem;
  }
}

@media (min-width: 600px) {
  .nav-more {
    display: none;
  }
}

@media (max-width: 720px) {
  .table-btn { margin-left: 0; }
  .site-header .table-btn { margin-left: 0; }
  .tray { width: 100%; }
}

.term-row, .card-controls, .sync-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0.6rem 0;
}

.term-popup {
  margin-top: 0.8rem;
  padding: 0.85rem;
  border: 2px solid var(--teal);
  border-radius: 0.8rem;
  background: white;
}

.study-card {
  min-height: 8rem;
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: 0.9rem;
  background: var(--card);
}

.study-card:focus {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

.sync-box textarea {
  width: 100%;
  min-height: 5rem;
  font: inherit;
  padding: 0.45rem 0.6rem;
  border: 1px solid var(--line);
  border-radius: 0.6rem;
}

.toast {
  margin: 0.6rem 0;
  padding: 0.6rem 0.75rem;
  border-radius: 0.6rem;
  background: #e7f6f3;
  font-weight: 700;
}

.confetti { position: relative; height: 0; }

.confetti-bit {
  position: absolute;
  top: 0;
  left: var(--x, 50%);
  width: 8px;
  height: 10px;
  background: var(--teal);
  animation: confetti-fall 900ms ease-out var(--delay, 0ms) forwards;
}

@keyframes confetti-fall {
  to { transform: translateY(4.5rem) rotate(40deg); opacity: 0; }
}

@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto !important; }
  .confetti-bit { animation: none; display: none; }
}