:root {
  --foreground-primary: #17211d;
  --foreground-secondary: #4d5b55;
  --foreground-tertiary: #6d7974;
  --foreground-muted: #8a938e;
  --surface-canvas: #f4efe5;
  --surface-panel: #fffaf0;
  --surface-overlay: #fffdf7;
  --surface-inset: #ece3d3;
  --border-subtle: #e7dccb;
  --border-default: #d4c7b5;
  --border-strong: #9c8f7d;
  --focus-ring: #0b6b5f;
  --accent: #0b6b5f;
  --accent-strong: #084e46;
  --success: #247a45;
  --warning: #a76a00;
  --destructive: #a33b2f;
  --info: #2d5f88;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --shadow-panel: 0 1px 0 rgba(23, 33, 29, 0.05);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 8% 6%, rgba(11, 107, 95, 0.12), transparent 28%),
    radial-gradient(circle at 88% 10%, rgba(167, 106, 0, 0.12), transparent 24%),
    linear-gradient(135deg, #f7f2e8 0%, var(--surface-canvas) 48%, #ebe2d4 100%);
  color: var(--foreground-primary);
  font-family: ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

button,
input,
select {
  font: inherit;
}

a {
  color: inherit;
}

.app-shell {
  display: grid;
  grid-template-columns: 292px minmax(0, 1fr);
  min-height: 100vh;
}

.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  padding: 24px;
  border-right: 1px solid var(--border-default);
  background:
    linear-gradient(180deg, rgba(255, 250, 240, 0.92), rgba(236, 227, 211, 0.92)),
    var(--surface-panel);
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.brand-block {
  display: flex;
  gap: 12px;
  align-items: center;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  border: 1px solid var(--border-strong);
  border-radius: 14px;
  background: var(--foreground-primary);
  color: var(--surface-panel);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-weight: 800;
  letter-spacing: -0.06em;
}

.eyebrow {
  margin: 0 0 4px;
  color: var(--foreground-tertiary);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

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

h1 {
  margin-bottom: 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 22px;
  line-height: 1.05;
  letter-spacing: -0.04em;
}

h2 {
  margin-bottom: 0;
  max-width: 780px;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(32px, 5vw, 56px);
  line-height: 0.95;
  letter-spacing: -0.06em;
}

h3 {
  margin-bottom: 0;
  font-size: 20px;
  line-height: 1.15;
  letter-spacing: -0.03em;
}

.nav-stack {
  display: grid;
  gap: 8px;
}

.nav-item {
  display: flex;
  align-items: center;
  min-height: 42px;
  padding: 10px 12px;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  color: var(--foreground-secondary);
  font-weight: 700;
  text-decoration: none;
}

.nav-item:hover {
  border-color: var(--border-default);
  background: rgba(255, 255, 255, 0.42);
}

.nav-item:focus-visible,
.button:focus-visible,
.dropzone:focus-within,
.mapping-select:focus-visible {
  outline: 3px solid rgba(11, 107, 95, 0.28);
  outline-offset: 2px;
}

.nav-item.active {
  border-color: var(--border-strong);
  background: var(--surface-overlay);
  color: var(--foreground-primary);
}

.sidebar-card {
  margin-top: auto;
  padding: 16px;
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  background: var(--surface-overlay);
  color: var(--foreground-secondary);
  font-size: 14px;
  box-shadow: var(--shadow-panel);
}

.sidebar-card p:last-child {
  margin-bottom: 0;
}

.workspace {
  min-width: 0;
  padding: 24px;
}

.topbar {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 24px;
  padding: 28px;
  border: 1px solid var(--border-default);
  border-radius: 28px;
  background: rgba(255, 250, 240, 0.78);
  box-shadow: var(--shadow-panel);
}

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

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 11px 15px;
  border: 1px solid var(--border-strong);
  border-radius: 10px;
  color: var(--foreground-primary);
  background: var(--surface-overlay);
  font-size: 14px;
  font-weight: 800;
  text-decoration: none;
  cursor: pointer;
  transition: background 160ms ease, border-color 160ms ease, transform 120ms ease;
}

.button:hover {
  border-color: var(--foreground-secondary);
  background: #ffffff;
}

.button:active {
  transform: translateY(1px);
}

.button.primary {
  border-color: var(--accent-strong);
  background: var(--accent);
  color: #fffaf0;
}

.button.primary:hover {
  background: var(--accent-strong);
}

.button.secondary {
  border-color: rgba(11, 107, 95, 0.35);
  color: var(--accent-strong);
}

.button.ghost {
  color: var(--foreground-secondary);
}

.button:disabled,
.button[aria-disabled="true"] {
  pointer-events: none;
  cursor: not-allowed;
  opacity: 0.52;
}

.status-strip {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin: 16px 0;
}

.status-card {
  display: flex;
  gap: 12px;
  min-height: 96px;
  padding: 16px;
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  background: rgba(255, 250, 240, 0.72);
}

.status-card p {
  margin: 4px 0 0;
  color: var(--foreground-secondary);
  font-size: 13px;
}

.step-number {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  color: var(--accent);
  font-weight: 800;
}

.upload-grid,
.content-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 16px;
  margin-bottom: 16px;
}

.content-grid {
  grid-template-columns: minmax(0, 1.5fr) minmax(300px, 0.72fr);
}

.panel {
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  background: var(--surface-panel);
  box-shadow: var(--shadow-panel);
}

.upload-panel,
.mapping-panel,
.diagram-panel,
.preflight-panel {
  padding: 20px;
}

.panel-heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 16px;
}

.panel-heading.compact {
  margin-bottom: 12px;
}

.badge,
.pill-status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 28px;
  padding: 4px 10px;
  border: 1px solid var(--border-default);
  border-radius: 999px;
  background: var(--surface-overlay);
  color: var(--foreground-secondary);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 12px;
  font-weight: 800;
}

.pill-status.mapped {
  border-color: rgba(36, 122, 69, 0.35);
  color: var(--success);
}

.pill-status.missing {
  border-color: rgba(167, 106, 0, 0.38);
  color: var(--warning);
}

.pill-status.extra {
  border-color: rgba(45, 95, 136, 0.35);
  color: var(--info);
}

.dropzone {
  display: grid;
  gap: 8px;
  min-height: 168px;
  padding: 24px;
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius-lg);
  background:
    linear-gradient(135deg, rgba(11, 107, 95, 0.08), transparent 34%),
    var(--surface-overlay);
  cursor: pointer;
  transition: border-color 160ms ease, background 160ms ease, transform 120ms ease;
}

.dropzone:hover,
.dropzone.dragging {
  border-color: var(--accent);
  background:
    linear-gradient(135deg, rgba(11, 107, 95, 0.13), transparent 34%),
    #fffdf7;
}

.dropzone:active {
  transform: translateY(1px);
}

.dropzone input {
  width: 1px;
  height: 1px;
  opacity: 0;
  position: absolute;
  pointer-events: none;
}

.dropzone-title {
  display: block;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 25px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.04em;
}

.dropzone-copy,
.muted {
  color: var(--foreground-secondary);
  font-size: 14px;
}

.file-card,
.csv-pill {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 12px;
  padding: 12px;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  background: var(--surface-overlay);
}

.file-card p,
.csv-pill span:last-child {
  margin: 2px 0 0;
  color: var(--foreground-tertiary);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 12px;
}

.file-icon {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border: 1px solid var(--border-default);
  border-radius: 11px;
  background: var(--surface-inset);
  color: var(--accent-strong);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-weight: 900;
}

.csv-list {
  display: grid;
  gap: 8px;
  max-height: 188px;
  overflow: auto;
}

.csv-pill {
  justify-content: space-between;
  margin-top: 0;
}

.csv-name,
.code,
.mapping-table code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

.diagram-panel {
  min-height: 560px;
  display: flex;
  flex-direction: column;
}

.diagram-empty {
  flex: 1;
  display: grid;
  place-items: center;
  align-content: center;
  gap: 10px;
  min-height: 420px;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  background:
    linear-gradient(90deg, rgba(23, 33, 29, 0.04) 1px, transparent 1px),
    linear-gradient(180deg, rgba(23, 33, 29, 0.04) 1px, transparent 1px),
    var(--surface-overlay);
  background-size: 28px 28px;
  text-align: center;
  color: var(--foreground-secondary);
}

.diagram-empty strong {
  color: var(--foreground-primary);
}

.diagram-glyph {
  width: 120px;
  height: 68px;
  border: 1px solid var(--border-strong);
  border-radius: 18px;
  background:
    linear-gradient(90deg, transparent 48%, var(--border-strong) 49%, var(--border-strong) 51%, transparent 52%),
    radial-gradient(circle at 22% 50%, var(--accent) 0 7px, transparent 8px),
    radial-gradient(circle at 78% 50%, var(--warning) 0 7px, transparent 8px),
    var(--surface-inset);
}

.diagram-frame {
  flex: 1;
  width: 100%;
  min-height: 480px;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  background: #fff;
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin-bottom: 16px;
}

.metric-card {
  padding: 12px;
  border: 1px solid rgba(36, 122, 69, 0.28);
  border-radius: var(--radius-md);
  background: rgba(36, 122, 69, 0.08);
}

.metric-card.warning {
  border-color: rgba(167, 106, 0, 0.28);
  background: rgba(167, 106, 0, 0.09);
}

.metric-card.neutral {
  border-color: rgba(45, 95, 136, 0.24);
  background: rgba(45, 95, 136, 0.08);
}

.metric-card span {
  display: block;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 28px;
  font-weight: 900;
  letter-spacing: -0.05em;
}

.metric-card p {
  margin: 0;
  color: var(--foreground-secondary);
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
}

.edge-list {
  display: grid;
  gap: 8px;
  max-height: 376px;
  overflow: auto;
}

.edge-item {
  padding: 11px 12px;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  background: var(--surface-overlay);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 12px;
  line-height: 1.45;
}

.mapping-panel {
  margin-bottom: 24px;
}

.mapping-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
}

.mapping-table {
  width: 100%;
  min-width: 940px;
  border-collapse: collapse;
  background: var(--surface-overlay);
}

.mapping-table th,
.mapping-table td {
  padding: 12px;
  border-bottom: 1px solid var(--border-subtle);
  text-align: left;
  vertical-align: middle;
}

.mapping-table th {
  background: var(--surface-inset);
  color: var(--foreground-secondary);
  font-size: 12px;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.mapping-table tr:last-child td {
  border-bottom: 0;
}

.empty-row {
  height: 88px;
  color: var(--foreground-tertiary);
  text-align: center;
}

.mapping-select {
  width: 100%;
  min-height: 40px;
  padding: 8px 10px;
  border: 1px solid var(--border-default);
  border-radius: 10px;
  background: var(--surface-panel);
  color: var(--foreground-primary);
}

.header-meter {
  display: grid;
  gap: 5px;
  min-width: 148px;
}

.meter-track {
  height: 8px;
  overflow: hidden;
  border-radius: 999px;
  background: var(--surface-inset);
}

.meter-fill {
  height: 100%;
  width: 0;
  border-radius: inherit;
  background: var(--accent);
}

.header-meter small {
  color: var(--foreground-tertiary);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

@media (max-width: 1080px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
    height: auto;
  }

  .nav-stack {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .content-grid,
  .upload-grid,
  .status-strip {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 680px) {
  .workspace,
  .sidebar {
    padding: 14px;
  }

  .topbar,
  .panel {
    border-radius: 18px;
  }

  .topbar {
    display: grid;
  }

  .topbar-actions,
  .panel-heading {
    display: grid;
    justify-content: stretch;
  }

  .button {
    width: 100%;
  }

  .nav-stack {
    grid-template-columns: 1fr 1fr;
  }

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

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.001ms !important;
    animation-duration: 0.001ms !important;
  }
}