* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: #172026;
  background: #f6f7f8;
}

button,
input,
select,
textarea {
  font: inherit;
}

.km-shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: minmax(320px, 380px) minmax(0, 1fr);
}

.km-list-pane {
  border-right: 1px solid #d8dee3;
  background: #ffffff;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.km-head {
  padding: 18px 18px 12px;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}

.km-head h1 {
  margin: 0;
  font-size: 20px;
  line-height: 1.25;
  font-weight: 700;
}

.km-head p {
  margin: 6px 0 0;
  color: #66737d;
  font-size: 13px;
}

.icon-btn {
  width: 34px;
  height: 34px;
  border: 1px solid #c9d1d8;
  background: #fff;
  border-radius: 6px;
  cursor: pointer;
}

.km-filter {
  padding: 0 18px 14px;
  display: grid;
  grid-template-columns: 1fr 128px;
  gap: 8px;
}

.km-filter input,
.km-filter select,
.maintenance-form input,
.maintenance-form select,
.maintenance-form textarea {
  width: 100%;
  border: 1px solid #c9d1d8;
  border-radius: 6px;
  background: #fff;
  color: #172026;
  padding: 9px 10px;
  outline: none;
}

.km-filter input:focus,
.km-filter select:focus,
.maintenance-form input:focus,
.maintenance-form select:focus,
.maintenance-form textarea:focus {
  border-color: #2f6f9f;
  box-shadow: 0 0 0 2px rgba(47, 111, 159, 0.14);
}

.gap-list {
  overflow: auto;
  padding: 0 10px 14px;
}

.gap-item {
  width: 100%;
  display: grid;
  gap: 5px;
  text-align: left;
  border: 1px solid transparent;
  border-radius: 8px;
  background: transparent;
  padding: 12px;
  cursor: pointer;
}

.gap-item:hover,
.gap-item.is-active {
  background: #eef4f7;
  border-color: #c8d9e4;
}

.gap-topic,
.gap-meta,
.muted {
  color: #66737d;
  font-size: 12px;
}

.gap-item strong {
  font-size: 14px;
  line-height: 1.35;
  font-weight: 650;
}

.km-detail-pane {
  min-width: 0;
  padding: 24px;
}

.empty-state,
.detail-view {
  max-width: 1040px;
  margin: 0 auto;
}

.empty-state {
  color: #66737d;
  padding-top: 20vh;
  text-align: center;
}

.detail-head {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  align-items: flex-start;
  padding-bottom: 18px;
  border-bottom: 1px solid #d8dee3;
}

.topic {
  margin: 0 0 6px;
  color: #2f6f9f;
  font-size: 13px;
  font-weight: 700;
}

.detail-head h2 {
  margin: 0;
  font-size: 24px;
  line-height: 1.3;
  letter-spacing: 0;
}

.status-pill {
  flex: 0 0 auto;
  border: 1px solid #c9d1d8;
  border-radius: 999px;
  padding: 5px 10px;
  font-size: 12px;
  background: #fff;
}

.metric-row {
  margin: 18px 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.metric-row div {
  border: 1px solid #d8dee3;
  border-radius: 8px;
  background: #fff;
  padding: 12px;
}

.metric-row span {
  display: block;
  color: #66737d;
  font-size: 12px;
  margin-bottom: 4px;
}

.metric-row strong {
  font-size: 14px;
}

.detail-section {
  margin-top: 20px;
}

.detail-section h3 {
  margin: 0 0 10px;
  font-size: 15px;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag {
  max-width: 100%;
  border: 1px solid #d8dee3;
  background: #fff;
  border-radius: 999px;
  padding: 6px 10px;
  font-size: 13px;
  overflow-wrap: anywhere;
}

.tag-list.risk .tag {
  border-color: #e5b8a8;
  background: #fff3ef;
}

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

.context-row {
  display: grid;
  grid-template-columns: 92px minmax(0, 1fr);
  gap: 8px;
  border: 1px solid #d8dee3;
  background: #fff;
  border-radius: 8px;
  padding: 10px;
}

.context-row span {
  color: #66737d;
  font-size: 12px;
}

.context-row p {
  margin: 0;
  overflow-wrap: anywhere;
}

.maintenance-form {
  display: grid;
  gap: 12px;
}

.maintenance-form label span {
  display: block;
  margin-bottom: 6px;
  font-size: 13px;
  color: #4f5d66;
}

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

.form-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
}

.btn {
  border: 1px solid #c9d1d8;
  border-radius: 6px;
  padding: 9px 14px;
  cursor: pointer;
}

.btn.primary {
  background: #1f6f5f;
  border-color: #1f6f5f;
  color: #fff;
}

.btn.secondary {
  background: #fff;
}

.btn:disabled,
input:disabled,
select:disabled,
textarea:disabled {
  opacity: 0.58;
  cursor: not-allowed;
}

.form-message {
  min-height: 20px;
  font-size: 13px;
  color: #66737d;
}

.form-message.ok {
  color: #1f6f5f;
}

.form-message.error,
.form-message.warn {
  color: #a33d2e;
}

@media (max-width: 860px) {
  .km-shell {
    grid-template-columns: 1fr;
  }

  .km-list-pane {
    min-height: auto;
    border-right: none;
    border-bottom: 1px solid #d8dee3;
  }

  .gap-list {
    max-height: 36vh;
  }

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

  .km-detail-pane {
    padding: 18px;
  }
}