:root {
  --bg: #f7f4ee;
  --surface: #fffdf8;
  --surface-2: #eef5f0;
  --ink: #1d2422;
  --muted: #68736e;
  --line: #d8d3c7;
  --accent: #147a64;
  --danger: #b94735;
  --warning: #d49b2f;
  --shadow: 0 18px 44px rgba(36, 44, 40, 0.09);
}

* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
button, input, select, textarea { font: inherit; }
button { cursor: pointer; }

.app-header, main {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
}
.app-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  padding: 34px 0 20px;
}
.eyebrow, .label {
  margin: 0 0 8px;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 750;
  text-transform: uppercase;
}
h1, h2, h3, p { margin-top: 0; }
h1 {
  margin-bottom: 0;
  font-size: clamp(2.1rem, 5vw, 4.7rem);
  line-height: 0.96;
}
h2 { margin-bottom: 0; font-size: 1.05rem; }
h3 { margin-bottom: 8px; font-size: 1rem; }

.header-actions, .button-row, .tabs, .segmented, .card-actions, .mini-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}
.icon-button {
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  color: var(--ink);
  font-size: 1.2rem;
  box-shadow: 0 8px 20px rgba(36, 44, 40, 0.06);
}
.icon-button.danger { color: var(--danger); }

.scenario-panel {
  display: grid;
  grid-template-columns: 1fr 1.4fr 1fr;
  gap: 18px;
  margin-bottom: 18px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow);
}
.segmented { flex-wrap: wrap; }
.segmented button, .tabs button, .button-row button, .course-card button, .mini-button {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
  min-height: 40px;
  padding: 0 14px;
  font-weight: 750;
}
.segmented button.active, .tabs button.active, .mini-button.selected {
  border-color: var(--accent);
  background: var(--accent);
  color: #fff;
}

.stat-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 10px; }
.scenario-tools {
  display: grid;
  align-content: end;
  gap: 8px;
}
.scenario-tools button {
  min-height: 42px;
  border: 1px solid var(--accent);
  border-radius: 8px;
  background: var(--accent);
  color: #fff;
  font-weight: 800;
}
.stat {
  min-height: 76px;
  padding: 13px 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-2);
}
.stat span, .panel-heading span, label span, .meta, .pill, .source-list {
  color: var(--muted);
  font-size: 0.82rem;
}
.stat strong { display: block; margin-top: 6px; font-size: 1.45rem; }

.tabs { overflow-x: auto; padding-bottom: 8px; }
.tabs button { flex: 0 0 auto; }
.tab-page { display: none; padding: 12px 0 40px; }
.tab-page.active { display: block; }

.toolbar {
  display: grid;
  grid-template-columns: minmax(220px, 1fr) 170px 230px 120px;
  gap: 12px;
  margin-bottom: 16px;
}
label { display: grid; gap: 6px; }
input, select, textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  color: var(--ink);
}
input, select { min-height: 42px; padding: 0 12px; }
textarea { resize: vertical; padding: 12px; min-height: 150px; }

.course-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; }
.course-card, .panel {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: 0 12px 28px rgba(36, 44, 40, 0.06);
}
.course-card { display: grid; gap: 12px; padding: 15px; min-height: 246px; }
.course-card.selected {
  border-color: rgba(20, 122, 100, 0.65);
  box-shadow: 0 0 0 3px rgba(20, 122, 100, 0.12);
}
.course-card.maybe {
  border-color: rgba(212, 155, 47, 0.7);
  box-shadow: 0 0 0 3px rgba(212, 155, 47, 0.14);
}
.course-title { margin: 0; font-size: 1.02rem; line-height: 1.25; }
.card-top, .panel-heading, .table-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}
.badge, .pill {
  display: inline-flex;
  align-items: center;
  min-height: 26px;
  padding: 0 8px;
  border-radius: 999px;
  background: #eee6d9;
  white-space: nowrap;
}
.badge { background: var(--ink); color: #fff; font-size: 0.8rem; font-weight: 800; }
.pill-row, .quality-badges, .suggestion-courses { display: flex; flex-wrap: wrap; gap: 6px; }
.quality-badge {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  padding: 0 8px;
  border-radius: 999px;
  background: #edf2ef;
  color: #334540;
  font-size: 0.72rem;
  font-weight: 800;
}
.quality-badge.good { background: #dff3ec; color: #245b4c; }
.quality-badge.warn { background: #fff0cf; color: #785719; }
.quality-badge.info { background: #e8eef7; color: #345071; }
.course-card button { align-self: end; width: 100%; }
.card-actions { align-self: end; }
.card-actions button { min-width: 0; }
.course-card button.remove {
  border-color: rgba(185, 71, 53, 0.35);
  background: rgba(185, 71, 53, 0.08);
  color: var(--danger);
}
.course-card button.maybe-active {
  border-color: rgba(212, 155, 47, 0.75);
  background: #fff6df;
  color: #7a5515;
}

.two-column { display: grid; grid-template-columns: 1.2fr 0.8fr; gap: 14px; }
.panel { padding: 16px; }
.panel-heading { align-items: center; margin-bottom: 14px; }
.table { display: grid; gap: 8px; }
.table-row {
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}
.table-row.maybe-row {
  border-color: rgba(212, 155, 47, 0.45);
  background: #fffaf0;
}
.table-row strong { display: block; margin-bottom: 4px; }
.mini-actions { flex-wrap: wrap; justify-content: flex-end; }
.saved-panel { margin-top: 14px; }
.scenario-list { display: grid; gap: 8px; }
.scenario-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}
.scenario-item strong { display: block; margin-bottom: 4px; }
.locked-tools {
  display: grid;
  gap: 10px;
  margin-bottom: 12px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #f7fbf8;
}
.locked-tools strong { display: block; margin-bottom: 3px; }
.locked-course-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.locked-chip {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  min-height: 32px;
  padding: 4px 5px 4px 10px;
  border-radius: 999px;
  background: #dff3ec;
  color: #245b4c;
  font-size: 0.78rem;
  font-weight: 800;
}
.locked-chip button, .maybe-button {
  border-color: rgba(212, 155, 47, 0.75);
  background: #fff6df;
  color: #7a5515;
}
.locked-chip button {
  min-height: 24px;
  padding: 0 8px;
  border: 1px solid rgba(212, 155, 47, 0.75);
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 850;
}
.suggestion-list { display: grid; gap: 10px; }
.suggestion-card {
  display: grid;
  grid-template-columns: 72px 1fr auto;
  gap: 12px;
  align-items: start;
  padding: 13px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}
.suggestion-score {
  display: grid;
  place-items: center;
  min-height: 66px;
  border-radius: 8px;
  background: var(--surface-2);
  color: var(--accent);
}
.suggestion-score strong { font-size: 1.35rem; }
.suggestion-score span { color: var(--muted); font-size: 0.72rem; font-weight: 800; }
.suggestion-courses { margin-top: 9px; }
.locked-pill {
  background: #dff3ec;
  color: #245b4c;
}
.warning-item {
  padding: 12px;
  border-left: 4px solid var(--warning);
  border-radius: 8px;
  background: #fff8e9;
  color: #4c3a18;
}
.warning-item.high { border-left-color: var(--danger); background: #fff0ed; color: #512019; }
.notice, .empty-state {
  margin-bottom: 14px;
  padding: 12px;
  border-radius: 8px;
  background: #eef5f0;
  color: #334540;
}
.cluster-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.cluster-card {
  padding: 13px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}
.timeline { display: grid; gap: 9px; }
.section-title { margin: 18px 0 10px; }
.compact-timeline { max-height: 520px; overflow: auto; padding-right: 4px; }
.week-board { display: grid; gap: 10px; }
.week-row {
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: 10px;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}
.week-label { display: grid; align-content: center; gap: 4px; }
.week-label span { color: var(--muted); font-size: 0.82rem; }
.week-days {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 8px;
}
.week-day {
  min-height: 74px;
  padding: 9px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: #f5fbf6;
}
.week-day.busy { background: #fff5e6; }
.week-day.has-overlap {
  border-color: #d14332;
  background: #fff0ec;
}
.week-day-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 6px;
  margin-bottom: 7px;
}
.week-day-head span { color: var(--muted); font-size: 0.78rem; }
.week-event {
  display: grid;
  gap: 2px;
  margin-top: 6px;
  padding: 7px;
  border-left: 4px solid var(--course-color);
  border-radius: 7px;
  background: #fff;
}
.week-event.overlap {
  border-left-color: #d14332;
  background: #fff8f6;
  box-shadow: inset 0 0 0 1px rgba(209, 67, 50, 0.22);
}
.week-event strong {
  color: var(--course-color);
  font-size: 0.78rem;
}
.week-event.overlap strong { color: #b33125; }
.week-event span {
  color: var(--ink);
  font-size: 0.76rem;
  line-height: 1.25;
}
.week-event .overlap-label {
  width: fit-content;
  padding: 2px 6px;
  border-radius: 999px;
  color: #8f281f;
  background: #ffe1da;
  font-size: 0.68rem;
  font-weight: 800;
}
.timeline-item {
  display: grid;
  grid-template-columns: 112px 1fr;
  gap: 12px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}
.timeline-item.colored-item {
  border-left: 5px solid var(--course-color);
}
.timeline-item.colored-item .date-chip {
  color: var(--course-color);
}
.timeline-item.exam-overlap {
  border-color: #d14332;
  border-left-color: #d14332;
  background: #fff8f6;
  box-shadow: inset 0 0 0 1px rgba(209, 67, 50, 0.18);
}
.timeline-item.exam-overlap .date-chip {
  color: #b33125;
}
.exam-gap-warning {
  width: fit-content;
  margin-top: 7px;
  padding: 3px 8px;
  border-radius: 999px;
  color: #8f281f;
  background: #ffe1da;
  font-size: 0.74rem;
  font-weight: 850;
}
.exam-period-note {
  width: fit-content;
  margin-top: 7px;
  padding: 3px 8px;
  border-radius: 999px;
  color: #245b4c;
  background: #dff3ec;
  font-size: 0.74rem;
  font-weight: 850;
}
.date-chip { color: var(--accent); font-weight: 850; }
.compact-label { grid-template-columns: auto 70px auto; align-items: center; color: var(--muted); }
.source-list { display: grid; gap: 10px; }
.source-list code { display: block; overflow-wrap: anywhere; color: var(--ink); }

@media (max-width: 920px) {
  .scenario-panel, .two-column, .toolbar { grid-template-columns: 1fr; }
  .course-grid, .cluster-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 620px) {
  .app-header { align-items: flex-start; flex-direction: column; }
  .course-grid, .cluster-grid, .stat-grid { grid-template-columns: 1fr; }
  .week-row, .week-days { grid-template-columns: 1fr; }
  .timeline-item, .suggestion-card { grid-template-columns: 1fr; }
}