:root {
  color-scheme: light;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: #18283a;
  background: #f5f7f6;
  font-synthesis: none;
  --ink: #18283a;
  --muted: #5e6b78;
  --line: #dce2df;
  --surface: #ffffff;
  --soft: #eef5f1;
  --green: #167655;
  --green-dark: #105a41;
  --navy: #163d63;
  --coral: #d26852;
  --danger: #a43a32;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-width: 20rem;
  min-height: 100vh;
  background: #f5f7f6;
}

button,
input,
textarea {
  font: inherit;
}

[hidden] {
  display: none !important;
}

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

.header-inner {
  width: min(100% - 2rem, 58rem);
  min-height: 4.5rem;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand-logo {
  display: block;
  width: 10.5rem;
  height: auto;
}

.header-label {
  color: var(--muted);
  font-size: 0.875rem;
  font-weight: 700;
}

.booking-page {
  width: min(100% - 2rem, 58rem);
  margin: 0 auto;
  padding: 3.5rem 0 5rem;
}

.intro {
  max-width: 47rem;
  padding-bottom: 2.75rem;
}

.eyebrow {
  margin: 0 0 0.75rem;
  color: var(--green);
  font-size: 0.8rem;
  font-weight: 800;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 43rem;
  margin-bottom: 1.25rem;
  color: var(--ink);
  font-size: clamp(2rem, 6vw, 3.5rem);
  line-height: 1.08;
  letter-spacing: 0;
}

.session-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem 1.4rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.session-facts span + span::before {
  content: "";
  display: inline-block;
  width: 0.3rem;
  height: 0.3rem;
  margin: 0 0.7rem 0.15rem 0;
  border-radius: 50%;
  background: var(--coral);
}

.booking-step {
  padding: 2rem 0 2.5rem;
  border-top: 1px solid var(--line);
}

.step-heading {
  display: flex;
  align-items: flex-start;
  gap: 0.9rem;
  margin-bottom: 1.5rem;
}

.step-number {
  flex: 0 0 2rem;
  display: grid;
  place-items: center;
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  background: var(--navy);
  color: #ffffff;
  font-size: 0.875rem;
  font-weight: 800;
}

h2 {
  margin-bottom: 0.25rem;
  font-size: 1.35rem;
  line-height: 1.25;
  letter-spacing: 0;
}

.step-detail {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.subject-options {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
}

.subject-option,
.time-option {
  border: 1px solid #bec9c4;
  border-radius: 6px;
  background: var(--surface);
  color: var(--ink);
  cursor: pointer;
  transition: border-color 140ms ease, box-shadow 140ms ease, background 140ms ease;
}

.subject-option {
  min-height: 5.25rem;
  padding: 1rem 1.1rem;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  text-align: left;
}

.subject-option strong {
  font-size: 1.05rem;
}

.subject-option span {
  margin-top: 0.25rem;
  color: var(--muted);
  font-size: 0.88rem;
}

.subject-option:hover,
.time-option:hover {
  border-color: var(--green);
}

.subject-option:focus-visible,
.time-option:focus-visible {
  outline: 3px solid rgba(22, 118, 85, 0.24);
  outline-offset: 2px;
}

.subject-option[aria-pressed="true"],
.time-option[aria-pressed="true"] {
  border-color: var(--green);
  background: var(--soft);
  box-shadow: inset 0 0 0 1px var(--green);
}

.subject-option[aria-pressed="true"] span {
  color: var(--green-dark);
}

.status {
  margin: 1rem 0 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.status[data-kind="error"] {
  color: var(--danger);
}

.status[data-kind="empty"] {
  padding: 1rem;
  border-left: 3px solid var(--coral);
  background: #fff7f4;
  color: #6d4138;
}

.slot-groups {
  display: grid;
  gap: 0;
}

.day-group {
  display: grid;
  grid-template-columns: minmax(10rem, 0.65fr) minmax(0, 1.35fr);
  gap: 1.5rem;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--line);
}

.day-group h3 {
  margin: 0.6rem 0 0;
  font-size: 1rem;
  line-height: 1.3;
  letter-spacing: 0;
}

.time-options {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.55rem;
}

.time-option {
  min-height: 2.75rem;
  padding: 0.65rem 0.5rem;
  font-size: 0.9rem;
  font-weight: 750;
  white-space: nowrap;
}

.selection {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.25rem 1rem;
  margin-top: 1.25rem;
  padding: 1.15rem 1.25rem;
  border: 1px solid #a8cbbb;
  border-radius: 6px;
  background: var(--soft);
}

.selection-label {
  grid-row: 1 / 3;
  align-self: center;
  color: var(--green-dark);
  font-size: 0.78rem;
  font-weight: 800;
  text-transform: uppercase;
}

.selection strong {
  font-size: 1rem;
}

.selection span:last-child {
  color: var(--muted);
  font-size: 0.88rem;
}

.booking-form {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem 1.25rem;
}

.booking-form label {
  display: grid;
  gap: 0.45rem;
  color: var(--ink);
  font-size: 0.9rem;
  font-weight: 700;
}

.booking-form label span {
  color: var(--muted);
  font-weight: 500;
}

.booking-form input,
.booking-form textarea {
  width: 100%;
  border: 1px solid #aebbb5;
  border-radius: 4px;
  background: var(--surface);
  color: var(--ink);
  padding: 0.72rem 0.8rem;
}

.booking-form textarea {
  min-height: 7rem;
  resize: vertical;
}

.booking-form input:focus,
.booking-form textarea:focus {
  border-color: var(--green);
  outline: 3px solid rgba(22, 118, 85, 0.2);
  outline-offset: 1px;
}

.form-wide {
  grid-column: 1 / -1;
}

.form-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.form-actions .status {
  margin: 0;
}

.primary-action {
  flex: 0 0 auto;
  min-height: 2.9rem;
  padding: 0.75rem 1.1rem;
  border: 1px solid var(--green-dark);
  border-radius: 5px;
  background: var(--green);
  color: #ffffff;
  font-weight: 800;
  cursor: pointer;
}

.primary-action:hover {
  background: var(--green-dark);
}

.primary-action:focus-visible {
  outline: 3px solid rgba(22, 118, 85, 0.25);
  outline-offset: 2px;
}

.primary-action:disabled {
  cursor: wait;
  opacity: 0.65;
}

.confirmation {
  max-width: 44rem;
  padding: 1rem 0 4rem;
}

.confirmation h2 {
  margin-bottom: 2rem;
  font-size: 2rem;
}

.confirmation-details {
  margin: 0;
  border-top: 1px solid var(--line);
}

.confirmation-details div {
  display: grid;
  grid-template-columns: minmax(9rem, 0.55fr) minmax(0, 1fr);
  gap: 1rem;
  padding: 0.9rem 0;
  border-bottom: 1px solid var(--line);
}

.confirmation-details dt {
  color: var(--muted);
  font-size: 0.85rem;
  font-weight: 700;
}

.confirmation-details dd {
  margin: 0;
  font-weight: 750;
  overflow-wrap: anywhere;
}

.manage-page .intro {
  padding-bottom: 1.75rem;
}

.manage-details {
  max-width: 44rem;
}

.manage-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.danger-action {
  min-height: 2.9rem;
  padding: 0.75rem 1.1rem;
  border: 1px solid var(--danger);
  border-radius: 5px;
  background: var(--surface);
  color: var(--danger);
  font-weight: 800;
  cursor: pointer;
}

.danger-action:hover {
  background: #fff2f0;
}

.danger-action:focus-visible {
  outline: 3px solid rgba(164, 58, 50, 0.2);
  outline-offset: 2px;
}

.danger-action:disabled {
  cursor: wait;
  opacity: 0.65;
}

.manage-confirm {
  margin-top: 1.25rem;
}

@media (max-width: 42rem) {
  .booking-page {
    padding-top: 2.5rem;
  }

  .header-label {
    display: none;
  }

  .subject-options,
  .day-group,
  .booking-form {
    grid-template-columns: 1fr;
  }

  .day-group {
    gap: 0.75rem;
  }

  .day-group h3 {
    margin-top: 0;
  }

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

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

  .selection-label {
    grid-row: auto;
  }

  .form-wide {
    grid-column: auto;
  }

  .form-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .confirmation-details div {
    grid-template-columns: 1fr;
    gap: 0.2rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition: none !important;
  }
}