:root {
  color-scheme: light;
  --bg: #f6f7f4;
  --panel: #ffffff;
  --text: #202124;
  --muted: #697077;
  --line: #d9ddd3;
  --accent: #0d6b57;
  --accent-dark: #094a3d;
  --warn: #b45309;
  --danger: #b91c1c;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", system-ui, sans-serif;
}

button,
input,
select {
  font: inherit;
}

button {
  border: 0;
  border-radius: 6px;
  background: var(--accent);
  color: #fff;
  cursor: pointer;
  padding: 0.65rem 0.9rem;
}

button:hover {
  background: var(--accent-dark);
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.45;
}

input,
select {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
  padding: 0.6rem 0.7rem;
}

label {
  display: grid;
  gap: 0.35rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.25rem clamp(1rem, 3vw, 2rem);
  border-bottom: 1px solid var(--line);
  background: #fff;
}

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

h1 {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
}

h2 {
  font-size: 1.25rem;
}

h3 {
  font-size: 1rem;
}

.eyebrow {
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
}

.status {
  color: var(--muted);
  font-size: 0.9rem;
  text-align: right;
}

main {
  display: grid;
  gap: 1rem;
  max-width: 1280px;
  margin: 0 auto;
  padding: 1rem;
}

.controls,
.summary,
.planner,
.talk-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
}

.controls {
  display: grid;
  grid-template-columns: 1fr 1.4fr 0.8fr;
  gap: 1rem;
  padding: 1rem;
}

.summary {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  overflow: hidden;
}

.summary div {
  display: grid;
  gap: 0.2rem;
  padding: 1rem;
  border-right: 1px solid var(--line);
}

.summary div:last-child {
  border-right: 0;
}

.summary span {
  font-size: 1.55rem;
  font-weight: 700;
}

.summary small,
.section-heading p,
.talk-meta,
.talk-people,
.plan-meta {
  color: var(--muted);
}

.planner {
  padding: 1rem;
}

.section-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1rem;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: flex-end;
}

.talk-list,
.personal-plan {
  display: grid;
  gap: 0.75rem;
}

.slot-group {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  overflow: hidden;
}

.slot-header {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  border-bottom: 1px solid var(--line);
  background: #eef3eb;
  padding: 0.8rem 1rem;
}

.slot-header strong {
  font-size: 1rem;
}

.slot-header span {
  color: var(--muted);
  font-size: 0.9rem;
}

.slot-talks {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 0;
}

.talk-card {
  display: grid;
  grid-template-rows: auto 1fr;
  gap: 1rem;
  min-width: 0;
  border: 0;
  border-right: 1px solid var(--line);
  border-radius: 0;
  padding: 1rem;
}

.talk-card:last-child {
  border-right: 0;
}

.talk-card.selected-for-planner {
  box-shadow: inset 0 0 0 3px rgba(13, 107, 87, 0.2);
}

.talk-card.conflicts-for-planner {
  background: #fff7ed;
  box-shadow: inset 0 0 0 3px rgba(180, 83, 9, 0.25);
}

.talk-main {
  display: grid;
  gap: 0.5rem;
}

.talk-meta,
.plan-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.75rem;
  font-size: 0.9rem;
}

.tag {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  border-radius: 999px;
  background: #e6f1ed;
  color: var(--accent-dark);
  font-size: 0.78rem;
  font-weight: 700;
  padding: 0.2rem 0.5rem;
}

.talk-people {
  font-size: 0.9rem;
}

.abstract {
  color: #3f454a;
  font-size: 0.92rem;
  line-height: 1.45;
}

.colleague-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 0.4rem;
  align-content: start;
}

.check {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  border: 1px solid var(--line);
  border-radius: 6px;
  color: var(--text);
  padding: 0.45rem 0.5rem;
}

.check input {
  width: auto;
}

.attendees {
  color: var(--accent-dark);
  font-weight: 700;
}

.empty {
  color: var(--muted);
  padding: 1rem;
}

.plan-item {
  border-left: 4px solid var(--accent);
  background: #fbfcfa;
  padding: 0.8rem;
}

.conflict {
  border-left-color: var(--danger);
}

.conflict-note {
  color: var(--danger);
  font-weight: 700;
}

.slot-note {
  color: var(--warn);
  font-size: 0.85rem;
  font-weight: 700;
}

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

@media (max-width: 900px) {
  .controls,
  .talk-card,
  .slot-talks {
    grid-template-columns: 1fr;
  }

  .talk-card {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .talk-card:last-child {
    border-bottom: 0;
  }

  .summary {
    grid-template-columns: repeat(2, 1fr);
  }

  .summary div:nth-child(2) {
    border-right: 0;
  }

  .section-heading,
  .topbar {
    align-items: flex-start;
    flex-direction: column;
  }
}