:root {
  color-scheme: light;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.5;
  color: #202124;
  background: #f4f6f8;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
}

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

button {
  min-height: 38px;
  border: 1px solid #1f5f8b;
  border-radius: 6px;
  padding: 0 14px;
  color: #ffffff;
  background: #1f5f8b;
  cursor: pointer;
}

button:hover {
  background: #184b70;
}

label {
  display: block;
  margin: 0 0 6px;
  font-size: 13px;
  font-weight: 650;
  color: #42474f;
}

input,
select,
textarea {
  width: 100%;
  border: 1px solid #c4cad3;
  border-radius: 6px;
  color: #1f2328;
  background: #ffffff;
}

input,
select {
  min-height: 40px;
  padding: 0 10px;
}

textarea {
  min-height: 160px;
  resize: vertical;
  padding: 10px;
}

.app-shell {
  width: min(1520px, calc(100% - 32px));
  margin: 0 auto;
  padding: 24px 0;
}

.app-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 14px;
}

.app-header h1 {
  margin: 0 0 4px;
  font-size: 28px;
  line-height: 1.15;
}

.app-header p {
  margin: 0;
  color: #5a6472;
}

.runtime-status {
  min-width: 136px;
  border: 1px solid #c4cad3;
  border-radius: 6px;
  padding: 7px 10px;
  text-align: center;
  font-size: 13px;
  font-weight: 650;
  color: #42474f;
  background: #ffffff;
}

.runtime-status[data-tone="ok"] {
  border-color: #7bb77e;
  color: #1f6b35;
  background: #eef8ef;
}

.runtime-status[data-tone="error"] {
  border-color: #d28a8a;
  color: #8a2d2d;
  background: #fff0f0;
}

.mode-tabs {
  display: inline-flex;
  gap: 4px;
  border: 1px solid #d4d9e1;
  border-radius: 8px;
  padding: 4px;
  margin-bottom: 16px;
  background: #ffffff;
}

.mode-tab {
  min-height: 34px;
  border-color: transparent;
  color: #4f5967;
  background: transparent;
}

.mode-tab:hover,
.mode-tab.is-active {
  color: #ffffff;
  background: #25364a;
}

.view[hidden] {
  display: none !important;
}

.architecture-empty[hidden],
#architecture-result[hidden] {
  display: none !important;
}

.workspace {
  display: grid;
  grid-template-columns: minmax(210px, 260px) minmax(420px, 1fr) minmax(300px, 380px);
  gap: 16px;
  align-items: start;
}

.control-panel,
.chat-panel,
.knowledge-panel,
.architecture-panel {
  border: 1px solid #d4d9e1;
  border-radius: 8px;
  background: #ffffff;
}

.control-panel,
.knowledge-panel {
  display: grid;
  gap: 18px;
  padding: 16px;
}

.panel-section {
  display: grid;
  gap: 10px;
}

.panel-section h2,
.upload-form h2,
.architecture-panel h2,
.review-section h2 {
  margin: 0;
  font-size: 15px;
  line-height: 1.3;
}

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

.section-heading span {
  min-width: 32px;
  border-radius: 999px;
  padding: 2px 8px;
  text-align: center;
  font-size: 12px;
  font-weight: 700;
  color: #42526b;
  background: #edf1f5;
}

.chat-panel {
  display: grid;
  grid-template-rows: minmax(520px, calc(100vh - 178px)) auto;
  min-height: 640px;
}

.chat-log {
  overflow-y: auto;
}

.chat-message {
  padding: 14px 16px;
  border-bottom: 1px solid #edf0f4;
}

.chat-message p {
  margin: 0 0 8px;
  white-space: pre-wrap;
}

.uncertainty {
  color: #8a4b00;
}

.source-list {
  margin: 8px 0;
  padding-left: 24px;
}

.source-list li {
  margin-bottom: 8px;
}

.source-list small,
.trace {
  display: block;
  margin-top: 4px;
  color: #5f6368;
}

.chat-form {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
  border-top: 1px solid #d4d9e1;
  padding: 12px;
}

.document-list {
  display: grid;
  gap: 8px;
  max-height: 260px;
  margin: 0;
  padding: 0;
  overflow-y: auto;
  list-style: none;
}

.document-list li {
  display: grid;
  gap: 2px;
  border: 1px solid #e3e7ed;
  border-radius: 6px;
  padding: 9px 10px;
  background: #fbfcfd;
}

.document-list strong {
  font-size: 13px;
}

.document-list span {
  overflow-wrap: anywhere;
  font-size: 12px;
  color: #5a6472;
}

.document-list .empty-state {
  color: #6f7782;
}

.upload-form {
  display: grid;
  gap: 10px;
}

.form-status {
  min-height: 20px;
  margin: 0;
  font-size: 13px;
  color: #5a6472;
}

.architecture-workbench {
  display: grid;
  grid-template-columns: minmax(280px, 350px) minmax(460px, 1fr) minmax(260px, 330px);
  gap: 16px;
  align-items: start;
}

.architecture-panel {
  min-width: 0;
}

.architecture-input,
.architecture-review {
  display: grid;
  gap: 16px;
  padding: 16px;
}

.architecture-input {
  border-top: 4px solid #2a8c82;
}

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

.architecture-form textarea {
  min-height: 300px;
}

.panel-kicker {
  margin: 0 0 4px;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
  color: #2a8c82;
}

.architecture-sheet {
  min-height: calc(100vh - 150px);
  overflow: hidden;
}

.architecture-empty {
  display: grid;
  place-items: center;
  min-height: 520px;
  padding: 24px;
  text-align: center;
  color: #66707f;
}

.architecture-empty strong,
.architecture-empty span {
  display: block;
}

.architecture-empty strong {
  color: #252b33;
}

.architecture-empty span {
  max-width: 360px;
}

.sheet-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
  border-bottom: 1px solid #e1e6ee;
  padding: 20px 22px 16px;
}

.sheet-header h2 {
  margin: 0;
  font-size: 24px;
  line-height: 1.2;
  color: #18212d;
}

.sheet-badges {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px;
}

.badge {
  border: 1px solid #d4d9e1;
  border-radius: 999px;
  padding: 4px 9px;
  white-space: nowrap;
  font-size: 12px;
  font-weight: 750;
  color: #4e5968;
  background: #f8fafc;
}

.badge[data-tone="ok"] {
  border-color: #89bf95;
  color: #1f6b35;
  background: #eff9f1;
}

.badge[data-tone="warn"] {
  border-color: #d7a451;
  color: #875100;
  background: #fff7e8;
}

.badge[data-tone="accent"] {
  border-color: #83b9b2;
  color: #176158;
  background: #edf8f6;
}

.sheet-lede {
  margin: 0;
  border-bottom: 1px solid #e9edf3;
  padding: 16px 22px;
  font-size: 15px;
  color: #354052;
  background: #fbfcfd;
}

.sheet-sections {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  padding: 16px;
}

.sheet-section {
  min-width: 0;
  border: 1px solid #e1e6ee;
  border-radius: 8px;
  padding: 13px;
  background: #ffffff;
}

.sheet-section h3 {
  margin: 0 0 9px;
  font-size: 14px;
  line-height: 1.25;
  color: #18212d;
}

.sheet-section p {
  margin: 0;
  color: #475263;
}

.sheet-list {
  display: grid;
  gap: 8px;
  margin: 0;
  padding-left: 18px;
}

.sheet-list li {
  color: #475263;
}

.sheet-list strong,
.sheet-list span,
.sheet-list small {
  display: block;
  overflow-wrap: anywhere;
}

.sheet-list strong {
  color: #202936;
}

.sheet-list small {
  margin-top: 2px;
  color: #7b5a16;
}

.json-panel {
  border-top: 1px solid #e1e6ee;
  padding: 12px 16px 16px;
}

.json-panel summary {
  cursor: pointer;
  font-weight: 700;
  color: #344054;
}

.json-panel pre {
  max-height: 360px;
  margin: 12px 0 0;
  border: 1px solid #e1e6ee;
  border-radius: 6px;
  padding: 12px;
  overflow: auto;
  font-size: 12px;
  background: #0f1720;
  color: #edf2f7;
}

.architecture-review {
  border-top: 4px solid #ba6b2b;
}

.review-section {
  display: grid;
  gap: 10px;
}

.review-meta {
  display: grid;
  gap: 8px;
  margin: 0;
}

.review-meta div {
  display: grid;
  gap: 2px;
  border: 1px solid #e1e6ee;
  border-radius: 6px;
  padding: 8px 10px;
  background: #fbfcfd;
}

.review-meta dt {
  font-size: 11px;
  font-weight: 800;
  text-transform: uppercase;
  color: #6b7280;
}

.review-meta dd {
  margin: 0;
  overflow-wrap: anywhere;
  color: #263241;
}

.support-list {
  display: grid;
  gap: 8px;
  margin: 0;
  padding-left: 18px;
}

.support-list li {
  color: #4b5563;
}

.support-list strong,
.support-list span {
  display: block;
  overflow-wrap: anywhere;
}

.support-list span {
  font-size: 12px;
  color: #6b7280;
}

.support-list.compact {
  font-size: 13px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (max-width: 1180px) {
  .workspace,
  .architecture-workbench {
    grid-template-columns: 1fr;
  }

  .chat-panel {
    grid-template-rows: minmax(420px, 52vh) auto;
    min-height: 0;
  }

  .architecture-sheet {
    min-height: 0;
  }
}

@media (max-width: 760px) {
  .sheet-header {
    flex-direction: column;
  }

  .sheet-badges {
    justify-content: flex-start;
  }

  .sheet-sections {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 620px) {
  .app-shell {
    width: min(100% - 20px, 1520px);
    padding: 14px 0;
  }

  .app-header {
    align-items: stretch;
    flex-direction: column;
  }

  .mode-tabs {
    display: grid;
  }

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