.academic-schedule-optimizer {
  --schedule-ink: #1d2522;
  --schedule-muted: #65736e;
  --schedule-line: #d7e4df;
  --schedule-panel: #fbfdfa;
  --schedule-soft: #eef7f2;
  --schedule-teal: #2f8f83;
  --schedule-coral: #c45a4a;
  --schedule-amber: #c99a2e;
  --schedule-violet: #6b5fc7;
  --schedule-shadow: rgba(34, 74, 63, 0.14);
  --schedule-scroll-track: rgba(215, 228, 223, 0.72);
  --schedule-scroll-thumb: linear-gradient(90deg, var(--schedule-teal), var(--schedule-violet));
  --schedule-white: #fff;

  width: 100%;
  color: var(--schedule-ink);
}

.theme-dark .academic-schedule-optimizer {
  --schedule-ink: #eef8f4;
  --schedule-muted: #aebfba;
  --schedule-line: #30453f;
  --schedule-panel: #111916;
  --schedule-soft: #182720;
  --schedule-teal: #62d4c6;
  --schedule-coral: #ff8d77;
  --schedule-amber: #f0c55f;
  --schedule-violet: #a99cff;
  --schedule-shadow: rgba(0, 0, 0, 0.3);
  --schedule-scroll-track: rgba(48, 69, 63, 0.9);
  --schedule-scroll-thumb: linear-gradient(90deg, var(--schedule-teal), var(--schedule-violet));
}

.schedule-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.85rem;
  width: 100%;
  border: 1px solid var(--schedule-line);
  border-radius: 0.75rem;
  background:
    linear-gradient(135deg, rgba(47, 143, 131, 0.12), transparent 45%),
    var(--schedule-panel);
  box-shadow: 0 1rem 2.5rem var(--schedule-shadow);
  padding: 0.8rem;
}

.schedule-form {
  display: grid;
  gap: 0.85rem;
  padding: 0;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.65rem;
}

.form-grid label {
  display: grid;
  gap: 0.3rem;
  color: var(--schedule-muted);
  font-size: 0.74rem;
  font-weight: 850;
  text-transform: uppercase;
}

.form-grid input,
.form-grid select {
  min-width: 0;
  min-height: 2.55rem;
  border: 1px solid var(--schedule-line);
  border-radius: 0.5rem;
  background: var(--schedule-panel);
  color: var(--schedule-ink);
  font-size: 0.96rem;
  font-weight: 760;
  padding: 0.55rem 0.65rem;
}

.form-grid select {
  appearance: none;
  padding-right: 2.25rem;
  background-image:
    linear-gradient(45deg, transparent 50%, var(--schedule-teal) 50%),
    linear-gradient(135deg, var(--schedule-teal) 50%, transparent 50%);
  background-position:
    calc(100% - 1.1rem) 50%,
    calc(100% - 0.78rem) 50%;
  background-size: 0.34rem 0.34rem, 0.34rem 0.34rem;
  background-repeat: no-repeat;
}

.form-grid input[type="color"] {
  padding: 0.2rem;
}

.weekend-options {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.55rem;
  margin: 0;
  padding: 0.65rem;
  border: 1px solid var(--schedule-line);
  border-radius: 0.5rem;
  background: var(--schedule-soft);
}

.weekend-options legend {
  color: var(--schedule-muted);
  font-size: 0.74rem;
  font-weight: 850;
  text-transform: uppercase;
}

.weekend-options label {
  display: flex;
  gap: 0.45rem;
  align-items: center;
  color: var(--schedule-ink);
  font-size: 0.88rem;
  font-weight: 800;
}

.weekend-options input {
  accent-color: var(--schedule-teal);
}

.schedule-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.65rem;
}

.schedule-actions button {
  min-height: 2.9rem;
  border: 0;
  border-radius: 0.5rem;
  background: var(--schedule-teal);
  color: var(--schedule-white);
  font-weight: 900;
  cursor: pointer;
}

.schedule-actions button:nth-child(2),
.schedule-actions button:last-child {
  background: var(--schedule-soft);
  color: var(--schedule-teal);
}

.schedule-actions button:last-child {
  grid-column: 1 / -1;
}

.conflict-panel {
  display: grid;
  gap: 0.25rem;
  padding: 0.75rem;
  border: 1px solid var(--schedule-line);
  border-radius: 0.5rem;
  background: var(--schedule-soft);
}

.conflict-panel strong {
  color: var(--schedule-ink);
}

.conflict-panel p {
  margin: 0;
  color: var(--schedule-muted);
}

.conflict-panel small {
  color: var(--schedule-muted);
  font-size: 0.78rem;
  line-height: 1.35;
}

.week-scroll-wrap {
  display: grid;
  gap: 0.45rem;
  min-width: 0;
  padding: 0.75rem 0 0;
  border-top: 1px solid var(--schedule-line);
}

.week-board {
  display: grid;
  grid-template-columns: 3.75rem minmax(38rem, 1fr);
  gap: 0.5rem;
  overflow-x: auto;
  scrollbar-width: none;
}

.week-board::-webkit-scrollbar {
  display: none;
}

.custom-scrollbar {
  position: relative;
  height: 0.72rem;
  margin-left: 4.25rem;
  border-radius: 999rem;
  background: var(--schedule-scroll-track);
  overflow: hidden;
}

.custom-scrollbar[hidden] {
  display: none;
}

.custom-scrollbar-thumb {
  position: absolute;
  inset-block: 0.14rem;
  left: 0;
  min-width: 2.75rem;
  border-radius: 999rem;
  background: var(--schedule-scroll-thumb);
  cursor: grab;
  box-shadow: 0 0.15rem 0.45rem var(--schedule-shadow);
  transition: background 0.16s ease;
}

.custom-scrollbar-thumb:hover {
  background: linear-gradient(90deg, var(--schedule-amber), var(--schedule-teal));
}

.time-rail,
.day-lane {
  display: grid;
  grid-template-rows: repeat(11, 3.2rem);
}

.time-rail {
  padding-top: 2.2rem;
  color: var(--schedule-muted);
  font-size: 0.72rem;
  font-weight: 800;
}

.day-grid {
  display: grid;
  grid-template-columns: repeat(var(--active-days, 5), minmax(7.5rem, 1fr));
  gap: 0.5rem;
}

.day-column {
  display: grid;
  grid-template-rows: 2rem auto;
  gap: 0.2rem;
}

.day-column > strong {
  display: grid;
  place-items: center;
  border-radius: 0.5rem;
  background: var(--schedule-soft);
  color: var(--schedule-teal);
  font-size: 0.85rem;
}

.day-lane {
  position: relative;
  border-inline: 1px solid var(--schedule-line);
  border-bottom: 1px solid var(--schedule-line);
  border-radius: 0 0 0.5rem 0.5rem;
  background:
    repeating-linear-gradient(
      to bottom,
      transparent 0,
      transparent calc(3.2rem - 1px),
      var(--schedule-line) calc(3.2rem - 1px),
      var(--schedule-line) 3.2rem
    );
}

.event-block {
  position: relative;
  display: grid;
  align-content: start;
  gap: 0.15rem;
  margin: 0.2rem;
  padding: 0.5rem;
  border-radius: 0.55rem;
  background: var(--event-color);
  color: var(--schedule-white);
  box-shadow: 0 0.5rem 1rem var(--schedule-shadow);
  cursor: grab;
  transition: transform 0.18s ease, outline-color 0.18s ease;
}

.event-block:active {
  cursor: grabbing;
  transform: scale(1.02);
}

.event-block.has-conflict {
  outline: 0.2rem solid var(--schedule-coral);
}

.event-block.is-selected {
  outline: 0.2rem solid var(--schedule-amber);
  transform: translateY(-1px);
}

.event-block strong,
.event-block span,
.event-block small {
  overflow-wrap: anywhere;
}

.event-block strong {
  font-size: 0.9rem;
}

.event-block span,
.event-block small {
  font-size: 0.73rem;
  opacity: 0.9;
}

.event-block button {
  position: absolute;
  top: 0.25rem;
  right: 0.25rem;
  width: 1.35rem;
  height: 1.35rem;
  border: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.22);
  color: var(--schedule-white);
  cursor: pointer;
}

@media (min-width: 900px) {
  .schedule-shell {
    grid-template-columns: minmax(18rem, 0.35fr) minmax(42rem, 1fr);
    align-items: start;
    gap: 1rem;
  }

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

  .week-scroll-wrap {
    padding: 0 0 0 1rem;
    border-top: 0;
    border-left: 1px solid var(--schedule-line);
  }

  .custom-scrollbar {
    margin-left: 3.75rem;
  }
}