/* -------------------------------------------------------
   1. Custom properties / tokens
   ------------------------------------------------------- */
:root {
  --color-paper: #F6F3EC;
  --color-paper-line: #E4DFD1;
  --color-ink: #182420;
  --color-ink-soft: #4B564F;
  --color-gold: #A87C2B;
  --color-gold-dim: #C9A768;
  --color-teal: #22463F;
  --color-danger: #9C4A3A;
  --color-surface: #FFFFFF;

  --font-display: 'Source Serif 4', serif;
  --font-body: 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  --space-xs: 0.375rem;
  --space-sm: 0.625rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2.75rem;

  --radius-base: 2px;
}

/* -------------------------------------------------------
   2. Reset / base
   ------------------------------------------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  padding: var(--space-xl) 1.25rem 6rem;
  background-color: var(--color-paper);
  background-image: linear-gradient(var(--color-paper-line) 1px, transparent 1px);
  background-size: 100% 42px;
  color: var(--color-ink);
  font-family: var(--font-body);
}

.wrapper {
  max-width: 45rem;
  margin: 0 auto;
}

/* -------------------------------------------------------
   3. Site header
   ------------------------------------------------------- */
.site-header {
  margin-bottom: var(--space-xl);
  padding-bottom: var(--space-lg);
  border-bottom: 2px solid var(--color-ink);
}

.site-header__eyebrow {
  margin-bottom: var(--space-sm);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-gold);
}

.site-header__title {
  margin: 0 0 var(--space-xs);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.75rem, 5vw, 2.5rem);
  letter-spacing: -0.01em;
}

.site-header__description {
  max-width: 52ch;
  margin: 0;
  color: var(--color-ink-soft);
  font-size: 0.90625rem;
  line-height: 1.5;
}

/* -------------------------------------------------------
   4. Form (Block: .entry-form)
   ------------------------------------------------------- */
.entry-form {
  margin-bottom: var(--space-xl);
  padding: var(--space-lg);
  border: 1px solid var(--color-ink);
  border-radius: var(--radius-base);
  background-color: var(--color-surface);
  box-shadow: 4px 4px 0 rgba(24, 36, 32, 0.08);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.entry-form--editing {
  border-color: var(--color-teal);
  box-shadow: 4px 4px 0 rgba(34, 70, 63, 0.16);
}

.entry-form__legend {
  margin: 0 0 var(--space-md);
  padding: 0;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-ink-soft);
}

.entry-form__row {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
}

.entry-form__field {
  margin-bottom: var(--space-md);
}

.entry-form__label {
  display: block;
  margin-bottom: 0.3125rem;
  font-size: 0.78125rem;
  font-weight: 500;
  color: var(--color-ink-soft);
}

.entry-form__input {
  width: 100%;
  padding: 0.625rem 0.75rem;
  border: 1px solid #CFC8B4;
  border-radius: var(--radius-base);
  background-color: #FDFCF9;
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: 0.875rem;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.entry-form__input:focus-visible {
  outline: none;
  border-color: var(--color-teal);
  box-shadow: 0 0 0 3px rgba(34, 70, 63, 0.12);
}

.entry-form__input:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.entry-form__actions {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-top: 0.25rem;
}

.entry-form__submit {
  padding: 0.75rem 1.25rem;
  border: none;
  border-radius: var(--radius-base);
  background-color: var(--color-ink);
  color: var(--color-paper);
  font-family: var(--font-mono);
  font-size: 0.78125rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background-color 0.15s ease, transform 0.12s ease;
}

.entry-form__submit:hover {
  background-color: var(--color-teal);
  transform: translateY(-1px);
}

.entry-form__submit:active {
  transform: translateY(0);
}

.entry-form__submit:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.entry-form__cancel {
  padding: 0.75rem 1rem;
  border: 1px solid #D8D2C1;
  border-radius: var(--radius-base);
  background: none;
  color: var(--color-ink-soft);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  cursor: pointer;
  transition: border-color 0.15s ease, color 0.15s ease;
}

.entry-form__cancel:hover {
  border-color: var(--color-danger);
  color: var(--color-danger);
}

.entry-form__error {
  margin: 0 0 var(--space-md);
  padding: 0.625rem 0.75rem;
  border: 1px solid var(--color-danger);
  border-radius: var(--radius-base);
  background-color: #FBEEEB;
  color: var(--color-danger);
  font-size: 0.8125rem;
}

/* -------------------------------------------------------
   5. List section (Block: .session-list)
   ------------------------------------------------------- */
.session-list__header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: var(--space-md);
}

.session-list__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.1875rem;
}

.session-list__count {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-ink-soft);
}

.session-list__items {
  list-style: none;
  margin: 0;
  padding: 0;
}

/* -------------------------------------------------------
   6. Card (Block: .card)
   ------------------------------------------------------- */
.card {
  display: flex;
  flex-direction: column;
  margin-bottom: var(--space-md);
  overflow: hidden;
  border: 1px solid var(--color-ink);
  border-radius: var(--radius-base);
  background-color: var(--color-surface);
  box-shadow: 3px 3px 0 rgba(24, 36, 32, 0.06);
  animation: card-rise 0.38s ease both;
}

.card--editing {
  border-color: var(--color-teal);
  box-shadow: 3px 3px 0 rgba(34, 70, 63, 0.14);
}

@keyframes card-rise {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.card__number {
  display: flex;
  align-items: flex-start;
  justify-content: flex-start;
  padding: var(--space-md);
  border-bottom: 1px dashed var(--color-paper-line);
  background-color: #FBF7EE;
  color: var(--color-gold);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 500;
}

.card__body {
  flex: 1;
  min-width: 0;
  padding: var(--space-md) 1.125rem;
}

.card__topic {
  margin: 0 0 var(--space-sm);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.0625rem;
}

.card__link-row {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 0.25rem 0;
  font-size: 0.84375rem;
}

.card__link-tag {
  min-width: 4.875rem;
  color: var(--color-ink-soft);
  font-family: var(--font-mono);
  font-size: 0.65625rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.card__link {
  max-width: 100%;
  overflow: hidden;
  color: var(--color-teal);
  text-decoration: none;
  text-overflow: ellipsis;
  white-space: nowrap;
  border-bottom: 1px solid var(--color-gold-dim);
}

.card__link:hover,
.card__link:focus-visible {
  color: var(--color-gold);
  border-color: var(--color-gold);
}

.card__date {
  margin-top: var(--space-sm);
  color: #A6A08C;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
}

.card__actions {
  display: flex;
  gap: var(--space-xs);
  margin-top: var(--space-sm);
}

.card__action-btn {
  padding: 0.3125rem 0.625rem;
  border: 1px solid #D8D2C1;
  border-radius: var(--radius-base);
  background: none;
  color: var(--color-ink-soft);
  font-family: var(--font-mono);
  font-size: 0.65625rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  cursor: pointer;
  transition: border-color 0.15s ease, color 0.15s ease;
}

.card__action-btn:hover,
.card__action-btn:focus-visible {
  border-color: var(--color-teal);
  color: var(--color-teal);
}

.card__action-btn--danger:hover,
.card__action-btn--danger:focus-visible {
  border-color: var(--color-danger);
  color: var(--color-danger);
}

.card__action-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* -------------------------------------------------------
   7. Empty state
   ------------------------------------------------------- */
.empty-state {
  padding: 2.25rem 1.25rem;
  border: 1px dashed #C9C2AC;
  border-radius: var(--radius-base);
  color: var(--color-ink-soft);
  font-size: 0.875rem;
  text-align: center;
}

.empty-state__title {
  margin: 0 0 0.375rem;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.125rem;
  color: var(--color-ink);
}

/* -------------------------------------------------------
   8. Toast
   ------------------------------------------------------- */
.toast {
  position: fixed;
  left: 50%;
  bottom: var(--space-lg);
  padding: 0.625rem 1.125rem;
  border-radius: var(--radius-base);
  background-color: var(--color-ink);
  color: var(--color-paper);
  font-family: var(--font-mono);
  font-size: 0.78125rem;
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, 20px);
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.toast--visible {
  opacity: 1;
  transform: translate(-50%, 0);
}

.toast--error {
  background-color: var(--color-danger);
}

/* -------------------------------------------------------
   9. Mobile-first breakpoints
   ------------------------------------------------------- */
@media (min-width: 35em) {
  .entry-form__row {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 30em) {
  .card {
    flex-direction: row;
  }

  .card__number {
    min-width: 3.25rem;
    border-right: 1px dashed var(--color-paper-line);
    border-bottom: none;
  }
}

/* -------------------------------------------------------
   10. Accessibility preferences
   ------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  .card {
    animation: none;
  }

  .entry-form,
  .entry-form__submit,
  .entry-form__cancel,
  .card,
  .card__action-btn,
  .toast {
    transition: none;
  }
}