:root {
  --color-page: #fff;
  --color-card: #fff;
  --color-ink: #0a0a0a;
  --color-ink-soft: #737373;
  --color-forest: #e84d17;
  --color-forest-dark: #bf3000;
  --color-accent: #e84d17;
  --color-line: #e5e5e5;
  --color-error: #e40014;
  --color-error-bg: rgba(228, 0, 20, .1);
  --color-success-bg: #d7f5d7;
  --color-success-text: #2c6330;
  --font-sans: -apple-system, "Segoe UI", "Helvetica Neue", Arial, system-ui, sans-serif;
  --content-width: 62rem;
  --radius: 12px;
}

@supports (color: lab(0% 0 0)) {
  :root {
    --color-page: lab(100% 0 0);
    --color-card: lab(100% 0 0);
    --color-ink: lab(2.75381% 0 0);
    --color-ink-soft: lab(48.496% 0 0);
    --color-forest: lab(55.353% 59.329 60.9349);
    --color-forest-dark: lab(43.6912% 60.0651 73.3574);
    --color-accent: lab(55.353% 59.329 60.9349);
    --color-line: lab(90.952% 0 -.0000119209);
    --color-error: lab(48.4493% 77.4328 61.5452);
    --color-error-bg: lab(48.4493% 77.4328 61.5452 / .1);
    --color-success-bg: lab(93.6911% -13.9721 10.9206);
    --color-success-text: lab(37.413% -28.0522 23.2407);
  }
}

* {
  box-sizing: border-box;
}

html {
  --lightningcss-light: initial;
  --lightningcss-dark: ;
  color-scheme: light;
}

body {
  background: var(--color-page);
  color: var(--color-ink);
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
  margin: 0;
  font-size: 17px;
  line-height: 1.55;
}

main {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 2.5rem 1.5rem 4rem;
  display: block;
}

h1, h2, h3 {
  font-family: var(--font-sans);
  color: var(--color-ink);
  font-weight: 600;
  line-height: 1.15;
}

h1 {
  margin: 0 0 .6rem;
  font-size: 2.15rem;
}

h2 {
  border-bottom: 1px solid var(--color-line);
  margin: 0 0 1rem;
  padding-bottom: .4rem;
  font-size: 1.35rem;
}

h3 {
  margin: 0 0 .5rem;
  font-size: 1rem;
}

p {
  margin: 0 0 1rem;
}

a {
  color: var(--color-forest-dark);
}

a:hover {
  color: var(--color-accent);
}

em {
  color: var(--color-ink-soft);
  font-style: italic;
}

.site-header {
  padding: 1.5rem 0 2.5rem;
}

.site-mark {
  align-items: center;
  gap: .6rem;
  margin-bottom: 1.75rem;
  display: flex;
}

.site-logo {
  width: 40px;
  height: 40px;
  display: block;
}

.site-name {
  font-family: var(--font-sans);
  letter-spacing: .02em;
  font-size: 1.05rem;
  font-weight: 600;
}

.hero p {
  max-width: 34rem;
  color: var(--color-ink-soft);
}

#biblio {
  font-family: var(--font-sans);
  letter-spacing: .02em;
  background: var(--color-forest);
  border-radius: var(--radius);
  cursor: pointer;
  border: none;
  margin-top: .3rem;
  margin-left: auto;
  padding: .65rem 1.3rem;
  font-size: 1.05rem;
  font-weight: 600;
  transition: background-color .15s;
}

#biblio a {
  color: #fdfcf8;
  text-decoration: none;
}

.registration {
  background: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  margin-bottom: 2.5rem;
  padding: 1.75rem 1.75rem 2rem;
}

form {
  flex-direction: column;
  gap: 1.1rem;
  display: flex;
}

.field-row {
  grid-template-columns: 1fr 1fr;
  gap: 1.1rem;
  display: grid;
}

.field {
  flex-direction: column;
  gap: .35rem;
  font-size: .92rem;
  display: flex;
}

.field > span {
  color: var(--color-ink-soft);
}

.field input {
  font: inherit;
  color: var(--color-ink);
  border: none;
  border-bottom: 1px solid var(--color-line);
  background: none;
  outline: none;
  padding: .4rem .1rem;
  font-size: 1rem;
  transition: border-color .15s;
}

.field input:focus-visible {
  border-bottom-color: var(--color-forest);
  outline: 2px solid var(--color-forest);
  outline-offset: 2px;
  border-radius: 1px;
}

button[type="submit"] {
  font: inherit;
  color: #fdfcf8;
  background: var(--color-forest);
  border-radius: var(--radius);
  cursor: pointer;
  border: none;
  align-self: flex-start;
  margin-top: .3rem;
  padding: .7rem 1.4rem;
  font-size: .95rem;
  transition: background-color .15s;
}

button[type="submit"]:hover:not(:disabled) {
  background: var(--color-forest-dark);
}

button[type="submit"]:disabled {
  background: var(--color-ink-soft);
  cursor: progress;
}

button[type="submit"]:focus-visible {
  outline: 2px solid var(--color-forest-dark);
  outline-offset: 2px;
}

.form-message {
  border-radius: var(--radius);
  margin: 0;
  padding: .7rem .9rem;
  font-size: .92rem;
}

.form-message-success {
  background: var(--color-success-bg);
  color: var(--color-forest-dark);
}

.form-message-error {
  background: var(--color-error-bg);
  color: var(--color-error);
}

.schedule-empty {
  color: var(--color-ink-soft);
  font-style: italic;
}

.schedule-grid {
  grid-template-columns: repeat(7, 1fr);
  gap: .75rem;
  display: grid;
}

.schedule-day {
  border-top: 2px solid var(--color-accent);
  padding-top: .6rem;
}

.schedule-slots {
  flex-direction: column;
  gap: .5rem;
  display: flex;
}

.schedule-slot {
  flex-direction: column;
  gap: .1rem;
  font-size: .85rem;
  display: flex;
}

.schedule-time {
  color: var(--color-ink-soft);
  font-variant-numeric: tabular-nums;
}

.schedule-subject {
  color: var(--color-ink);
}

.verify-page {
  max-width: var(--content-width);
  margin: 3rem auto;
  padding: 0 1.5rem;
}

@media (width <= 640px) {
  .field-row, .schedule-grid {
    grid-template-columns: 1fr;
  }

  .schedule-day {
    border-top: none;
    border-left: 2px solid var(--color-accent);
    padding-top: 0;
    padding-left: .75rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
  }
}