:root {
  color-scheme: light;
  --paper: #f8fafc;
  --ink: #172554;
  --muted: #334155;
  --line: #dbe3f0;
  --card: #ffffff;
  --blue: #2563eb;
  --blue-dark: #1d4ed8;
  --purple: #7c3aed;
  --teal: #0d9488;
  --orange: #f59e0b;
  --warn: #9a3412;
  --max: 42rem;
}

* { box-sizing: border-box; }

[hidden] { display: none !important; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: system-ui, sans-serif;
  font-size: 1.0625rem;
  line-height: 1.5;
}

.site-header {
  background: var(--card);
  border-bottom: 1px solid var(--line);
}

.site-bar {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0.75rem 1rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.65rem 1.25rem;
}

.brand {
  margin: 0;
  font-size: 1rem;
  font-weight: 750;
  letter-spacing: -0.02em;
  color: var(--blue);
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.site-nav a {
  color: var(--ink);
  font-weight: 650;
  text-decoration: none;
  padding: 0.35rem 0.7rem;
  border-radius: 999px;
}

.site-nav a:hover {
  background: #eff6ff;
  color: var(--blue-dark);
}

.site-nav a[aria-current="page"] {
  background: #eff6ff;
  color: var(--blue);
}

main {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 1rem 2.5rem;
}

h1 {
  font-size: 1.85rem;
  line-height: 1.15;
  margin: 1rem 0 0.35rem;
  letter-spacing: -0.03em;
}

h2 {
  font-size: 1.2rem;
  margin: 0 0 0.55rem;
  letter-spacing: -0.02em;
}

h3 {
  font-size: 1.02rem;
  margin: 1rem 0 0.35rem;
  color: var(--purple);
}

.lede {
  color: var(--muted);
  margin: 0 0 0.2rem;
}

a { color: var(--blue); }

a:hover { color: var(--blue-dark); }

.tool, .prose, .scale-note {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 0.9rem;
  padding: 0.95rem;
  margin-top: 1rem;
  box-shadow: 0 1px 2px rgba(23, 37, 84, 0.04);
}

.prose { border-top: 4px solid var(--teal); }

.scale-note { border-top: 4px solid var(--purple); }

.result-slot { display: flow-root; }

.result {
  background: var(--card);
  color: var(--ink);
  border: 1px solid #bfdbfe;
  border-left: 4px solid var(--blue);
  border-radius: 0.85rem;
  padding: 0.85rem 1rem;
  margin: 0.85rem 0 1rem;
}

.result.is-live {
  border-left-color: var(--teal);
}

.result p { margin: 0.28rem 0; }

.course-percent {
  font-size: 1.85rem;
  font-weight: 750;
  letter-spacing: -0.03em;
  line-height: 1.15;
  color: var(--blue-dark);
}

.math {
  font-family: ui-monospace, "DejaVu Sans Mono", monospace;
  font-size: 0.92rem;
  overflow-wrap: anywhere;
  color: var(--muted);
}

.hint, .row-note, footer, .scale-help {
  color: var(--muted);
  font-size: 0.95rem;
}

.row-note[data-kind="warn"] { color: var(--warn); }
.row-note[data-kind="letter"] { color: var(--ink); font-weight: 650; }

.rows { display: grid; gap: 0.75rem; }

.row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.45rem 0.6rem;
  padding-bottom: 0.7rem;
  border-bottom: 1px solid var(--line);
}

.row .name { grid-column: 1 / -1; }

label, .field {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  font-size: 0.82rem;
  font-weight: 650;
  color: var(--ink);
  min-width: 0;
}

input, button {
  font: inherit;
  color: inherit;
}

input {
  font-size: 1rem;
  font-weight: 450;
  min-height: 2.75rem;
  padding: 0.4rem 0.6rem;
  border: 1px solid #cbd5e1;
  border-radius: 0.55rem;
  background: #fff;
  width: 100%;
  max-width: 100%;
}

input:hover { border-color: #93c5fd; }

input:focus {
  outline: 2px solid var(--blue);
  outline-offset: 1px;
  border-color: var(--blue);
}

button {
  min-height: 2.75rem;
  padding: 0.4rem 0.85rem;
  border-radius: 0.55rem;
  border: 1px solid #cbd5e1;
  background: #fff;
  cursor: pointer;
}

button:hover { border-color: var(--blue); background: #f8fafc; }

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

button.primary, button[type="submit"] {
  background: var(--blue);
  color: #fff;
  border-color: var(--blue);
  font-weight: 700;
}

button.primary:hover, button[type="submit"]:hover {
  background: var(--blue-dark);
  border-color: var(--blue-dark);
}

.row-remove { align-self: end; }

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.8rem;
}

fieldset {
  border: 1px solid var(--line);
  border-radius: 0.7rem;
  margin: 0.9rem 0 0;
  padding: 0.75rem;
}

legend {
  font-weight: 750;
  padding: 0 0.3rem;
  color: #0f766e;
}

.pair {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.6rem;
}

.scale {
  display: grid;
  gap: 0.35rem;
  margin-top: 0.6rem;
}

.scale-row, .scale-head {
  display: grid;
  grid-template-columns: minmax(2.6rem, 3.2rem) minmax(2.4rem, 4.2rem) minmax(0, 1fr);
  gap: 0.45rem;
  align-items: center;
}

.scale-head {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 700;
}

.scale-row input { min-height: 2.4rem; }

.modes {
  display: grid;
  gap: 0.45rem;
  margin-top: 0.9rem;
}

.modes button { text-align: left; }

.modes button[aria-selected="true"] {
  border-color: var(--purple);
  background: #f5f3ff;
  font-weight: 700;
  color: #5b21b6;
}

.sentence {
  font-size: 1.12rem;
  line-height: 1.8;
  overflow-wrap: anywhere;
}

.sentence input {
  width: 5.6rem;
  max-width: 46%;
  display: inline-block;
  margin: 0.1rem 0.15rem;
  vertical-align: middle;
}

.direction {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin: 0.2rem 0 0.35rem;
}

.direction label {
  flex-direction: row;
  align-items: center;
  gap: 0.35rem;
  font-size: 1rem;
  font-weight: 650;
}

.direction input { width: auto; min-height: 0; }

.panel[hidden] { display: none !important; }

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}

th, td {
  text-align: left;
  padding: 0.32rem 0.35rem;
  border-bottom: 1px solid var(--line);
}

th { color: var(--muted); font-size: 0.82rem; }

footer {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0.4rem 1rem 2rem;
  border-top: 3px solid var(--orange);
}

footer p { margin: 0.35rem 0 0; }

.need-ceiling { font-weight: 700; color: var(--ink); }

@media (max-width: 719px) {
  .result.is-live {
    position: sticky;
    top: 0;
    z-index: 2;
    max-height: 12rem;
    overflow-y: auto;
  }
}

@media (min-width: 720px) {
  .row {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 0.8fr) minmax(0, 0.8fr) minmax(0, 0.7fr) auto;
    align-items: end;
  }

  .row .name { grid-column: auto; }

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

body.home .home-bar,
body.home .home-main,
body.home .home-footer {
  max-width: 52rem;
}

body.home .home-nav {
  max-width: 100%;
}

body.home .home-hero {
  padding: 1.25rem 0 0.25rem;
}

body.home .home-hero h1 {
  max-width: 18em;
}

body.home .home-actions,
body.home .home-card-grid {
  display: grid;
  gap: 0.75rem;
}

body.home .home-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.75rem;
  padding: 0.45rem 0.9rem;
  border-radius: 0.55rem;
  background: var(--blue);
  color: #fff;
  font-weight: 700;
  text-decoration: none;
  text-align: center;
}

body.home .home-button:hover {
  background: var(--blue-dark);
  color: #fff;
}

body.home .home-button:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 2px;
}

body.home .home-button-secondary {
  background: #fff;
  color: var(--purple);
  border: 1px solid var(--purple);
}

body.home .home-button-secondary:hover {
  background: #f5f3ff;
  color: var(--purple);
}

body.home .home-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-top: 4px solid var(--teal);
  border-radius: 0.9rem;
  padding: 0.95rem;
  box-shadow: 0 1px 2px rgba(23, 37, 84, 0.04);
  min-width: 0;
}

body.home .home-card:nth-child(2) {
  border-top-color: var(--purple);
}

body.home .home-card h3 {
  margin-top: 0.35rem;
  color: var(--ink);
}

body.home .home-icon {
  width: 3rem;
  height: 3rem;
  display: block;
}

body.home .home-steps,
body.home .home-why,
body.home .home-soon {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 0.9rem;
  padding: 0.95rem 1rem;
  margin-top: 1rem;
}

body.home .home-steps { border-top: 4px solid var(--blue); }
body.home .home-why { border-top: 4px solid var(--orange); }
body.home .home-soon { border-top: 4px solid var(--teal); }

body.home .home-steps ol,
body.home .home-why ul {
  margin: 0.4rem 0 0;
  padding-left: 1.2rem;
}

body.home .home-steps li,
body.home .home-why li {
  margin: 0.45rem 0;
}

body.home .home-footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.9rem;
  margin-top: 0.45rem;
}

body.home .home-footer .brand {
  margin-top: 0.2rem;
}

@media (max-width: 719px) {
  body.home .home-bar {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (min-width: 720px) {
  body.home .home-actions {
    grid-template-columns: repeat(2, max-content);
  }

  body.home .home-card-grid {
    grid-template-columns: 1fr 1fr;
  }
}

body.blog .home-bar,
body.blog .home-main,
body.blog .home-footer {
  max-width: 42rem;
}

body.blog .home-nav { max-width: 100%; }

body.blog .blog-card,
body.blog .blog-article {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 0.9rem;
  padding: 0.95rem 1rem;
  margin-top: 1rem;
  box-shadow: 0 1px 2px rgba(23, 37, 84, 0.04);
  min-width: 0;
}

body.blog .blog-card { border-top: 4px solid var(--blue); }
body.blog .blog-article { border-top: 4px solid var(--teal); }

body.blog .blog-card h2 { margin: 0 0 0.4rem; }

body.blog .blog-article h2 {
  margin-top: 1.25rem;
  color: var(--ink);
}

body.blog .blog-article .math { color: var(--ink); }

body.blog .blog-back { margin: 1rem 0 0; }

body.blog .home-footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.9rem;
  margin-top: 0.45rem;
}

@media (max-width: 719px) {
  body.blog .home-bar {
    flex-direction: column;
    align-items: flex-start;
  }
}