:root {
  --paper: #f3eee4;
  --paper-2: #fffdf8;
  --ink: #172033;
  --muted: #4a5568;
  --line: #ddd4c6;
  --green: #0e6b52;
  --green-deep: #08382c;
  --green-soft: #e4f3ec;
  --bell: #8d3b22;
  --bell-soft: #f8ebe3;
  --gold: #f4e4b4;
  --blue: #e3ebf7;
  --lilac: #efe4f4;
  --shadow: 0 22px 50px rgba(23, 32, 51, 0.12);
  --serif: 'Literata', 'Iowan Old Style', Palatino, Georgia, serif;
  --sans: 'Source Sans 3', 'Avenir Next', 'Segoe UI', sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(180deg, rgba(255, 253, 248, 0.92), rgba(243, 238, 228, 0.88) 280px),
    var(--paper);
  font-family: var(--sans);
  font-size: 1.0625rem;
  line-height: 1.55;
}

.skip {
  position: absolute;
  left: 1rem;
  top: -4rem;
  background: var(--ink);
  color: white;
  padding: 0.5rem 0.8rem;
  z-index: 5;
}

.skip:focus {
  top: 0.75rem;
}

a {
  color: var(--green-deep);
}

a:focus-visible,
summary:focus-visible {
  outline: 3px solid var(--green);
  outline-offset: 3px;
}

.site-header {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding: 1rem 6vw;
  position: sticky;
  top: 0;
  z-index: 4;
  background: rgba(243, 238, 228, 0.92);
  border-bottom: 1px solid transparent;
  backdrop-filter: blur(10px);
}

.brand {
  display: flex;
  gap: 0.75rem;
  align-items: center;
  color: inherit;
  text-decoration: none;
}

.mark {
  width: 2rem;
  height: 2rem;
  color: var(--ink);
  flex: none;
}

.brand strong {
  display: block;
  font-family: var(--serif);
  font-size: 1.15rem;
  letter-spacing: -0.02em;
}

.brand small,
.status {
  color: var(--muted);
  font-size: 0.82rem;
}

.nav {
  display: flex;
  gap: 1.1rem;
  margin-left: auto;
}

.nav a {
  color: var(--ink);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
}

.status {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--gold);
  color: var(--ink);
  border-radius: 999px;
  padding: 0.25rem 0.7rem;
  font-weight: 600;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: 2.5rem;
  align-items: end;
  padding: 3.2rem 6vw 2rem;
}

.eyebrow {
  margin: 0 0 0.8rem;
  color: var(--green);
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-size: 0.78rem;
}

h1,
h2,
h3 {
  font-family: var(--serif);
  font-weight: 650;
  letter-spacing: -0.03em;
  line-height: 1.08;
}

h1 {
  margin: 0;
  font-size: clamp(2.5rem, 5vw, 4.6rem);
}

.lead {
  font-size: 1.2rem;
  max-width: 38rem;
  color: var(--muted);
}

.hero-points {
  padding: 0;
  margin: 1.4rem 0 0;
  list-style: none;
  display: grid;
  gap: 0.45rem;
}

.hero-points li {
  padding-left: 1.1rem;
  position: relative;
  font-weight: 600;
}

.hero-points li::before {
  content: '';
  width: 0.45rem;
  height: 0.45rem;
  border-radius: 2px;
  background: var(--green);
  position: absolute;
  left: 0;
  top: 0.55rem;
}

.board {
  margin: 0;
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: 18px;
  box-shadow: var(--shadow);
  overflow: hidden;
}

.board figcaption {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--line);
  font-size: 0.92rem;
}

.board figcaption span:first-child {
  font-family: var(--serif);
  font-weight: 650;
}

.board figcaption span:last-child {
  color: var(--muted);
}

.board-scroll {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 640px;
  font-size: 0.82rem;
}

th,
td {
  border-bottom: 1px solid var(--line);
  border-right: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
  padding: 0.45rem;
}

thead th {
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
  background: #f7f3ea;
}

tbody th {
  width: 3.4rem;
  background: #f7f3ea;
  font-weight: 500;
}

tbody th b {
  display: block;
  font-family: var(--serif);
}

tbody th time,
.lesson small,
.gap {
  color: var(--muted);
  font-weight: 500;
  font-size: 0.75rem;
}

.lesson {
  font-weight: 650;
}

.lesson small {
  display: block;
  font-weight: 500;
}

.math {
  background: var(--green-soft);
}

.pol,
.hist {
  background: var(--bell-soft);
}

.ang,
.geo {
  background: var(--gold);
}

.wf,
.biol {
  background: var(--blue);
}

.inf,
.chem {
  background: var(--lilac);
}

.locked {
  outline: 1.5px dashed var(--green-deep);
  outline-offset: -3px;
}

.swap {
  background: #f6d3c4;
  color: var(--bell);
}

.gap {
  text-align: center;
  letter-spacing: 0.02em;
}

.sr {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
}

.notice {
  margin: 0 6vw 1rem;
  padding: 0.9rem 1.1rem;
  background: var(--green-deep);
  color: #f4efe6;
  border-radius: 14px;
}

.notice p {
  margin: 0;
}

.section {
  padding: 3.5rem 6vw;
}

.section-alt {
  background: rgba(255, 253, 248, 0.72);
  border-block: 1px solid var(--line);
}

.section-head {
  max-width: 40rem;
  margin-bottom: 1.8rem;
}

.index {
  margin: 0;
  color: var(--green);
  font-family: var(--serif);
  font-weight: 650;
}

h2 {
  margin: 0.2rem 0 0.6rem;
  font-size: clamp(2rem, 3vw, 2.8rem);
}

.section-head p:last-child {
  margin: 0;
  color: var(--muted);
}

.features {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.9rem;
}

.feature {
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 1.15rem 1.15rem 1.25rem;
}

.feature-lead {
  grid-column: span 2;
  background:
    linear-gradient(160deg, rgba(228, 243, 236, 0.9), rgba(255, 253, 248, 0.4) 55%), var(--paper-2);
}

.feature h3,
.schools h3,
.steps h3,
.split h3 {
  margin: 0 0 0.45rem;
  font-size: 1.35rem;
}

.feature p,
.schools p,
.steps p,
.faq p,
.aside,
.site-footer p {
  margin: 0;
  color: var(--muted);
}

.schools,
.steps,
.roles {
  display: grid;
  gap: 0.8rem;
  padding: 0;
  margin: 0;
  list-style: none;
}

.schools {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.schools li,
.steps li,
.split article {
  border-top: 2px solid var(--green);
  background: var(--paper-2);
  border-radius: 0 0 14px 14px;
  padding: 1rem 1rem 1.1rem;
}

.steps {
  grid-template-columns: repeat(4, minmax(0, 1fr));
  counter-reset: step;
}

.steps li {
  counter-increment: step;
}

.steps li::before {
  content: counter(step);
  font-family: var(--serif);
  color: var(--green);
  font-weight: 650;
}

.roles {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.roles li {
  padding: 0.9rem 0;
  border-bottom: 1px solid var(--line);
}

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.9rem;
}

.split ul {
  margin: 0.4rem 0 0;
  padding-left: 1.1rem;
  color: var(--muted);
}

.aside {
  margin-top: 1rem;
  max-width: 46rem;
}

.faq {
  display: grid;
  gap: 0.6rem;
}

details {
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.85rem 1rem;
}

summary {
  cursor: pointer;
  font-weight: 700;
}

details p {
  margin-top: 0.6rem;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 2rem 6vw 2.5rem;
  border-top: 1px solid var(--line);
}

.site-footer strong {
  font-family: var(--serif);
  font-size: 1.2rem;
}

@media (max-width: 980px) {
  .hero,
  .features,
  .schools,
  .steps,
  .split,
  .roles {
    grid-template-columns: 1fr;
  }

  .feature-lead {
    grid-column: auto;
  }

  .site-header {
    flex-wrap: wrap;
  }

  .nav {
    order: 3;
    width: 100%;
    margin-left: 0;
    flex-wrap: wrap;
    gap: 0.35rem 1rem;
  }

  .status {
    margin-left: auto;
  }

  .site-header,
  .site-footer {
    align-items: flex-start;
  }

  .site-footer {
    flex-direction: column;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}