:root {
  --bg: #eef3f6;
  --panel: #ffffff;
  --ink: #18222b;
  --muted: #657483;
  --line: #d9e2ea;
  --accent: #0b7285;
  --accent-dark: #07515f;
  --ok: #197c43;
  --warn: #ad6513;
  --bad: #b42318;
  --chip: #edf7f8;
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans SC", Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
}

button,
input,
select {
  font: inherit;
}

button {
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--ink);
  border-radius: 8px;
  padding: 9px 12px;
  cursor: pointer;
}

button:hover,
button.active {
  border-color: var(--accent);
  color: var(--accent-dark);
}

.back-link {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  color: var(--ink);
  text-decoration: none;
}

.back-link:hover {
  border-color: var(--accent);
  color: var(--accent-dark);
}

.shell {
  min-height: 100vh;
  padding: 22px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 18px;
}

.eyebrow {
  margin: 0 0 4px;
  color: var(--accent-dark);
  font-size: 13px;
  font-weight: 700;
}

h1,
h2,
p {
  margin: 0;
}

h1 {
  font-size: 28px;
  font-weight: 800;
}

h2 {
  font-size: 17px;
}

.actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

#selectMinimum {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}

.layout {
  display: grid;
  grid-template-columns: minmax(350px, 430px) minmax(0, 1fr);
  gap: 18px;
  align-items: start;
}

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

.course-panel {
  position: sticky;
  top: 18px;
  max-height: calc(100vh - 40px);
  overflow: auto;
}

.panel-head {
  position: sticky;
  top: 0;
  z-index: 3;
  background: var(--panel);
  display: grid;
  gap: 12px;
  padding: 16px;
  border-bottom: 1px solid var(--line);
}

#courseSearch {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px 12px;
}

.track-switch {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  padding: 12px 16px 0;
}

.course-list {
  padding: 12px 16px 18px;
}

.group {
  margin-top: 12px;
  border-top: 1px solid var(--line);
  padding-top: 12px;
}

.group:first-child {
  border-top: 0;
  padding-top: 0;
}

.group-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 8px;
  color: var(--muted);
  font-size: 13px;
}

.course-row {
  display: grid;
  grid-template-columns: 22px minmax(0, 1fr) auto;
  gap: 10px;
  align-items: start;
  padding: 10px 0;
  border-top: 1px solid #edf2f5;
}

.course-row:first-of-type {
  border-top: 0;
}

.course-row input[type="checkbox"] {
  width: 18px;
  height: 18px;
  margin-top: 2px;
}

.course-name {
  font-weight: 700;
  line-height: 1.35;
}

.course-meta {
  margin-top: 5px;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.5;
}

.badges {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  margin-top: 7px;
}

.badge {
  display: inline-flex;
  align-items: center;
  min-height: 20px;
  border-radius: 999px;
  padding: 2px 7px;
  background: #eef4f7;
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
}

.badge.ok {
  background: #e8f6ee;
  color: var(--ok);
}

.badge.warn {
  background: #fff4df;
  color: var(--warn);
}

.badge.bad {
  background: #fff0ef;
  color: var(--bad);
}

.credit-pill {
  min-width: 44px;
  text-align: center;
  background: var(--chip);
  color: var(--accent-dark);
  border-radius: 999px;
  padding: 4px 8px;
  font-size: 12px;
  font-weight: 700;
}

.result-panel {
  display: grid;
  gap: 16px;
}

.summary-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.summary-card {
  padding: 14px;
}

.summary-card .label {
  color: var(--muted);
  font-size: 12px;
}

.summary-card .value {
  margin-top: 6px;
  font-size: 24px;
  font-weight: 800;
}

.summary-card.ok {
  border-color: #a8d8bf;
}

.summary-card.warn {
  border-color: #ecc894;
}

.summary-card.bad {
  border-color: #eda8a2;
}

.card {
  padding: 16px;
}

.section-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.section-title span {
  color: var(--muted);
  font-size: 13px;
}

.schedule-tools {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
  color: var(--muted);
  font-size: 13px;
}

.schedule-tools label {
  display: flex;
  align-items: center;
  gap: 8px;
}

select {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 8px 10px;
  background: white;
}

.schedule-table {
  display: grid;
  gap: 8px;
}

.weekly-timetable {
  display: grid;
  grid-template-columns: 72px repeat(7, minmax(112px, 1fr));
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
  background: var(--line);
  gap: 1px;
}

.timetable-cell {
  min-height: 82px;
  background: white;
  padding: 8px;
  font-size: 12px;
  line-height: 1.35;
}

.timetable-head,
.timetable-slot {
  min-height: 42px;
  display: grid;
  place-items: center;
  background: #f1f7fa;
  color: var(--accent-dark);
  font-weight: 800;
}

.timetable-slot {
  min-height: 82px;
  color: var(--muted);
}

.class-block {
  display: grid;
  gap: 4px;
  border-left: 3px solid var(--accent);
  background: var(--chip);
  border-radius: 6px;
  padding: 7px;
  margin-bottom: 6px;
}

.class-block strong {
  font-size: 12px;
  color: var(--ink);
}

.class-block span {
  color: var(--muted);
}

.class-block.conflict {
  border-left-color: var(--bad);
  background: #fff0ef;
}

.schedule-row {
  display: grid;
  grid-template-columns: minmax(180px, 1fr) 82px minmax(150px, 1fr) minmax(170px, 1.2fr) 92px;
  gap: 8px;
  align-items: center;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.schedule-row.conflict {
  border-color: var(--bad);
  background: #fff4f3;
}

.schedule-row strong {
  display: block;
  line-height: 1.35;
}

.schedule-row small {
  display: block;
  color: var(--muted);
  margin-top: 4px;
}

.time-input {
  width: 100%;
}

.class-select {
  width: 100%;
}

.time-lines {
  color: var(--muted);
  font-size: 13px;
  line-height: 1.45;
}

.requirements {
  display: grid;
  gap: 8px;
}

.requirement {
  display: grid;
  grid-template-columns: 150px 1fr 160px;
  gap: 12px;
  align-items: center;
  padding: 8px 0;
  border-top: 1px solid #edf2f5;
}

.requirement:first-child {
  border-top: 0;
}

.bar {
  height: 10px;
  background: #e9eef2;
  border-radius: 999px;
  overflow: hidden;
}

.bar span {
  display: block;
  height: 100%;
  width: 0;
  background: var(--accent);
}

.requirement.done .bar span {
  background: var(--ok);
}

.requirement.over .bar span {
  background: var(--warn);
}

.status-text {
  font-size: 13px;
  color: var(--muted);
  text-align: right;
}

.empty {
  color: var(--muted);
  padding: 18px;
  border: 1px dashed var(--line);
  border-radius: 8px;
  text-align: center;
}

.diff-list {
  display: grid;
  gap: 8px;
}

.diff-item {
  display: grid;
  grid-template-columns: 128px 1fr;
  gap: 10px;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  font-size: 13px;
}

.diff-item strong {
  color: var(--accent-dark);
}

.diff-item p {
  color: var(--muted);
  line-height: 1.5;
}

@media (max-width: 980px) {
  .layout,
  .summary-grid {
    grid-template-columns: 1fr;
  }

  .course-panel {
    position: static;
    max-height: none;
  }

  .schedule-row {
    grid-template-columns: 1fr 1fr;
  }

  .weekly-timetable {
    grid-template-columns: 62px repeat(7, minmax(96px, 1fr));
    overflow-x: auto;
  }

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

  .status-text {
    text-align: left;
  }
}