/* TC-017A — shared UI design foundation.
   Loaded after the legacy inline stylesheet and before feature-specific styles. */
:root {
  color-scheme: light;

  --color-bg: #f4f7fb;
  --color-surface: #ffffff;
  --color-surface-muted: #f8fafc;
  --color-surface-raised: #ffffff;
  --color-border: #e2e8f0;
  --color-border-strong: #cbd5e1;
  --color-text: #0f172a;
  --color-text-secondary: #475569;
  --color-text-muted: #64748b;
  --color-sidebar: #071a33;
  --color-sidebar-elevated: #0b2344;
  --color-sidebar-text: #eef6ff;
  --color-sidebar-muted: #a7b8cf;

  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-primary-active: #1e40af;
  --color-primary-soft: #eff6ff;
  --color-focus-ring: rgba(37, 99, 235, 0.24);
  --color-info: #3b82f6;

  --color-success-text: #067647;
  --color-success-bg: #ecfdf3;
  --color-success-border: #abefc6;
  --color-warning-text: #b54708;
  --color-warning-bg: #fffaeb;
  --color-warning-border: #fedf89;
  --color-danger-text: #b42318;
  --color-danger-bg: #fef3f2;
  --color-danger-border: #fecdca;
  --color-neutral-text: #475467;
  --color-neutral-bg: #f2f4f7;
  --color-neutral-border: #d0d5dd;
  --color-special-text: #6941c6;
  --color-special-bg: #f4f3ff;
  --color-special-border: #d9d6fe;

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 40px;
  --space-8: 48px;
  --space-9: 64px;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-pill: 999px;

  --shadow-xs: 0 1px 2px rgba(15, 23, 42, 0.05);
  --shadow-sm: 0 4px 12px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 12px 30px rgba(15, 23, 42, 0.1);
  --shadow-lg: 0 24px 64px rgba(15, 23, 42, 0.16);
  --shadow-primary: 0 10px 24px rgba(37, 99, 235, 0.24);

  --motion-fast: 120ms;
  --motion-medium: 180ms;
  --motion-slow: 240ms;
  --motion-ease: cubic-bezier(0.2, 0.8, 0.2, 1);

  --z-sticky: 10;
  --z-drawer: 40;
  --z-modal: 70;
  --z-toast: 80;
  --z-busy: 90;
  --z-tooltip: 100;

  /* Compatibility aliases for the current one-file frontend. */
  --bg: var(--color-bg);
  --page: var(--color-bg);
  --panel: var(--color-surface);
  --panel2: var(--color-surface-muted);
  --soft: var(--color-surface-muted);
  --line: var(--color-border);
  --line2: var(--color-border-strong);
  --text: var(--color-text);
  --muted: var(--color-text-muted);
  --white: #ffffff;
  --accent: var(--color-primary);
  --accent2: var(--color-primary-hover);
  --side: var(--color-sidebar);
  --side2: var(--color-sidebar-elevated);
  --sideText: var(--color-sidebar-text);
  --sideMuted: var(--color-sidebar-muted);
  --green: var(--color-success-text);
  --red: var(--color-danger-text);
  --yellow: var(--color-warning-text);
  --blue: var(--color-primary);
  --pink: var(--color-special-text);
  --shadow: var(--shadow-md);
  --shadow-soft: var(--shadow-sm);
}

html {
  background: var(--color-bg);
  text-rendering: optimizeLegibility;
}

body {
  background: var(--color-bg);
  color: var(--color-text);
  font: 14px/20px Inter, system-ui, -apple-system, "Segoe UI", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

button,
a,
input,
select,
textarea,
[tabindex]:not([tabindex="-1"]) {
  -webkit-tap-highlight-color: transparent;
}

button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
[tabindex]:not([tabindex="-1"]):focus-visible {
  outline: 3px solid var(--color-focus-ring);
  outline-offset: 2px;
}

b,
strong {
  font-weight: 650;
}

h1,
h2,
h3,
h4 {
  color: var(--color-text);
  letter-spacing: -0.012em;
}

.small {
  font-size: 12px;
  line-height: 16px;
}

.muted {
  color: var(--color-text-muted);
}

.mono,
.num,
.kpi .num,
td,
th {
  font-variant-numeric: tabular-nums;
}

.card,
.auth-card,
.client-card,
.issue,
.month,
.rawcell,
.msg,
.contract-line,
.entity-row {
  border-color: var(--color-border);
  border-radius: var(--radius-lg);
}

.card,
.auth-card {
  box-shadow: var(--shadow-sm);
}

.card,
.client-card,
.issue,
.month,
.entity-row {
  transition:
    border-color var(--motion-fast) var(--motion-ease),
    box-shadow var(--motion-medium) var(--motion-ease),
    transform var(--motion-medium) var(--motion-ease),
    background-color var(--motion-fast) var(--motion-ease);
}

.card:hover,
.client-card:hover,
.issue:hover,
.month:hover {
  border-color: var(--color-border-strong);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.pad {
  padding: var(--space-4);
}

.grid {
  gap: var(--space-4);
}

.toolbar {
  gap: var(--space-2);
}

/* Buttons */
.btn {
  min-height: 40px;
  padding: 0 var(--space-4);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  color: var(--color-text-secondary);
  box-shadow: var(--shadow-xs);
  font-weight: 600;
  line-height: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  transition:
    transform var(--motion-fast) var(--motion-ease),
    box-shadow var(--motion-medium) var(--motion-ease),
    background-color var(--motion-fast) var(--motion-ease),
    border-color var(--motion-fast) var(--motion-ease),
    color var(--motion-fast) var(--motion-ease),
    opacity var(--motion-fast) var(--motion-ease);
}

.btn:hover:not(:disabled):not([aria-disabled="true"]) {
  background: var(--color-primary-soft);
  border-color: #93c5fd;
  color: var(--color-primary-hover);
  box-shadow: var(--shadow-sm);
  transform: translateY(-1px);
}

.btn:active:not(:disabled):not([aria-disabled="true"]) {
  transform: translateY(0);
  box-shadow: var(--shadow-xs);
}

.btn.primary {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #ffffff;
  box-shadow: 0 6px 16px rgba(37, 99, 235, 0.18);
}

.btn.primary:hover:not(:disabled):not([aria-disabled="true"]) {
  background: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
  color: #ffffff;
  box-shadow: var(--shadow-primary);
}

.btn.primary:active:not(:disabled):not([aria-disabled="true"]) {
  background: var(--color-primary-active);
  border-color: var(--color-primary-active);
}

.btn.green {
  background: var(--color-success-bg);
  border-color: var(--color-success-border);
  color: var(--color-success-text);
}

.btn.green:hover:not(:disabled):not([aria-disabled="true"]) {
  background: #dffbea;
  border-color: #75e0a7;
  color: var(--color-success-text);
}

.btn.danger {
  background: var(--color-danger-bg);
  border-color: var(--color-danger-border);
  color: var(--color-danger-text);
}

.btn.danger:hover:not(:disabled):not([aria-disabled="true"]) {
  background: #fee4e2;
  border-color: #fda29b;
  color: #912018;
}

.btn:disabled,
.btn[aria-disabled="true"] {
  cursor: not-allowed;
  opacity: 0.45;
  box-shadow: none;
  transform: none;
}

.btn.is-loading,
.btn[aria-busy="true"] {
  position: relative;
  pointer-events: none;
}

.btn.is-loading::before,
.btn[aria-busy="true"]::before {
  content: "";
  width: 14px;
  height: 14px;
  flex: 0 0 14px;
  border: 2px solid currentColor;
  border-right-color: transparent;
  border-radius: 50%;
  animation: uiSpin 700ms linear infinite;
}

.icon-btn {
  width: 40px;
  height: 40px;
  min-height: 40px;
  padding: 0;
  border-radius: var(--radius-md);
}

/* Fields */
.field {
  min-width: 0;
}

.field label {
  margin-bottom: 6px;
  color: var(--color-text-secondary);
  font-size: 12px;
  line-height: 16px;
  font-weight: 600;
}

.field input,
.field select,
.field textarea {
  width: 100%;
  min-height: 40px;
  padding: 9px 12px;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  color: var(--color-text);
  box-shadow: var(--shadow-xs);
  outline: none;
  transition:
    border-color var(--motion-fast) var(--motion-ease),
    box-shadow var(--motion-fast) var(--motion-ease),
    background-color var(--motion-fast) var(--motion-ease);
}

.field input:hover:not(:disabled),
.field select:hover:not(:disabled),
.field textarea:hover:not(:disabled) {
  border-color: #94a3b8;
}

.field input:focus,
.field select:focus,
.field textarea:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-focus-ring);
}

.field input::placeholder,
.field textarea::placeholder {
  color: #94a3b8;
  opacity: 1;
}

.field input:disabled,
.field select:disabled,
.field textarea:disabled {
  cursor: not-allowed;
  background: var(--color-neutral-bg);
  color: var(--color-text-muted);
  opacity: 1;
}

.field input[readonly],
.field textarea[readonly] {
  background: var(--color-surface-muted);
  color: var(--color-text-secondary);
}

.field input[aria-invalid="true"],
.field select[aria-invalid="true"],
.field textarea[aria-invalid="true"] {
  border-color: var(--color-danger-text);
  box-shadow: 0 0 0 3px rgba(180, 35, 24, 0.12);
}

.field-error {
  margin-top: 6px;
  color: var(--color-danger-text);
  font-size: 12px;
  line-height: 16px;
}

/* Semantic badges */
.pill,
.source-badge,
.role-badge,
.read-only-note {
  min-height: 24px;
  padding: 3px 8px;
  border-radius: var(--radius-pill);
  font-size: 11px;
  line-height: 16px;
  font-weight: 600;
  white-space: nowrap;
  word-break: normal;
  overflow-wrap: normal;
  box-shadow: none;
}

.pill {
  border-color: var(--color-neutral-border);
  background: var(--color-neutral-bg);
  color: var(--color-neutral-text);
}

.pill.service,
.source-badge,
.role-badge {
  border-color: #b2ddff;
  background: #eff8ff;
  color: #175cd3;
}

.pill.red {
  border-color: var(--color-danger-border);
  background: var(--color-danger-bg);
  color: var(--color-danger-text);
}

.pill.yellow {
  border-color: var(--color-warning-border);
  background: var(--color-warning-bg);
  color: var(--color-warning-text);
}

.pill.green {
  border-color: var(--color-success-border);
  background: var(--color-success-bg);
  color: var(--color-success-text);
}

.pill.pink {
  border-color: var(--color-special-border);
  background: var(--color-special-bg);
  color: var(--color-special-text);
}

.pill.blue {
  border-color: #b2ddff;
  background: #eff8ff;
  color: #175cd3;
}

/* Tables: foundation only, no screen-specific restructuring. */
.tablewrap {
  border-color: var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xs);
}

table {
  color: var(--color-text);
}

th,
td {
  border-bottom-color: #edf1f6;
  vertical-align: middle;
  word-break: normal;
  overflow-wrap: break-word;
  line-height: 18px;
}

th {
  min-height: 40px;
  padding: 11px 12px;
  background: #f1f5f9;
  color: var(--color-text-secondary);
  border-bottom-color: var(--color-border);
  font-size: 11px;
  line-height: 16px;
  font-weight: 650;
  letter-spacing: 0.01em;
}

td {
  padding: 11px 12px;
  transition: background-color var(--motion-fast) var(--motion-ease);
}

tr:hover td {
  background: #f8fbff;
}

.click-row:focus-visible {
  outline: 3px solid var(--color-focus-ring);
  outline-offset: -3px;
}

.selected-row td {
  background: #eff6ff !important;
}

.selected-row td:first-child {
  box-shadow: inset 3px 0 0 var(--color-primary);
}

.tablewrap .mono,
.kv .mono,
.rawcell .mono,
.pre {
  word-break: normal;
  overflow-wrap: anywhere;
}

/* Tabs */
.tabs {
  gap: var(--space-1);
  border-bottom: 1px solid var(--color-border);
}

.tab {
  position: relative;
  min-height: 36px;
  padding: 8px 10px 10px;
  border: 0;
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
  background: transparent;
  color: var(--color-text-muted);
  box-shadow: none;
  font-weight: 600;
  transition:
    color var(--motion-fast) var(--motion-ease),
    background-color var(--motion-fast) var(--motion-ease);
}

.tab::after {
  content: "";
  position: absolute;
  left: 10px;
  right: 10px;
  bottom: -1px;
  height: 2px;
  border-radius: 2px;
  background: var(--color-primary);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform var(--motion-medium) var(--motion-ease);
}

.tab:hover {
  background: var(--color-primary-soft);
  color: var(--color-primary-hover);
}

.tab.active {
  border: 0;
  background: transparent;
  color: var(--color-primary);
}

.tab.active::after {
  transform: scaleX(1);
}

/* Feedback */
.toast-stack {
  top: var(--space-4);
  right: var(--space-4);
  z-index: var(--z-toast);
  gap: var(--space-2);
}

.toast {
  border-radius: var(--radius-md);
  padding: 12px 14px;
  border-color: var(--color-border);
  background: var(--color-surface);
  color: var(--color-text-secondary);
  box-shadow: var(--shadow-lg);
  animation: uiToastIn var(--motion-slow) var(--motion-ease);
}

.toast.success {
  border-color: var(--color-success-border);
}

.toast.error {
  border-color: var(--color-danger-border);
}

.toast.warning {
  border-color: var(--color-warning-border);
}

.toast button {
  min-width: 32px;
  min-height: 32px;
  border-radius: var(--radius-sm);
  transition: background-color var(--motion-fast) var(--motion-ease);
}

.toast button:hover {
  background: var(--color-neutral-bg);
}

.modal-root {
  z-index: var(--z-modal);
}

.modal-root.open .modal-backdrop {
  animation: uiFadeIn var(--motion-medium) var(--motion-ease);
}

.modal-card {
  border-radius: var(--radius-xl);
  border-color: var(--color-border);
  box-shadow: var(--shadow-lg);
  animation: uiModalIn var(--motion-slow) var(--motion-ease);
}

.busy-overlay {
  z-index: var(--z-busy);
  background: rgba(244, 247, 251, 0.78);
}

.busy-card {
  border-radius: var(--radius-lg);
  border-color: var(--color-border);
  box-shadow: var(--shadow-lg);
}

.spinner {
  border-color: #cbd5e1;
  border-top-color: var(--color-primary);
  animation: uiSpin 700ms linear infinite;
}

.empty-state {
  min-height: 160px;
  padding: 36px 24px;
  display: grid;
  place-content: center;
  gap: 6px;
  color: var(--color-text-muted);
}

.empty-state b {
  margin: 0;
  color: var(--color-text);
  font-size: 15px;
  line-height: 22px;
  font-weight: 650;
}

.hint {
  padding: 12px 14px;
  border-left: 3px solid var(--color-primary);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  background: var(--color-primary-soft);
  color: #17406f;
}

.read-only-note {
  border-color: var(--color-neutral-border);
  background: var(--color-neutral-bg);
  color: var(--color-neutral-text);
}

.auth-error {
  border-color: var(--color-danger-border);
  border-radius: var(--radius-md);
  background: var(--color-danger-bg);
  color: var(--color-danger-text);
}

/* Reusable skeleton primitive for subsequent screen PRs. */
.skeleton {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-sm);
  background: #e8edf3;
  color: transparent !important;
  user-select: none;
}

.skeleton::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.72), transparent);
  transform: translateX(-100%);
  animation: uiShimmer 1200ms linear infinite;
}

.skeleton-line {
  height: 12px;
  margin: 8px 0;
}

.skeleton-line.short {
  width: 60%;
}

/* Accessible custom tooltip, progressively enhanced by ui-foundation.js. */
.ui-tooltip {
  position: fixed;
  z-index: var(--z-tooltip);
  max-width: 280px;
  padding: 8px 10px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-sm);
  background: #0f2742;
  color: #ffffff;
  box-shadow: var(--shadow-md);
  font-size: 12px;
  line-height: 16px;
  pointer-events: none;
  opacity: 0;
  transform: translateY(4px) scale(0.98);
  transition:
    opacity var(--motion-fast) var(--motion-ease),
    transform var(--motion-fast) var(--motion-ease);
}

.ui-tooltip[data-open="true"] {
  opacity: 1;
  transform: translateY(0) scale(1);
}

@keyframes uiSpin {
  to { transform: rotate(360deg); }
}

@keyframes uiShimmer {
  to { transform: translateX(100%); }
}

@keyframes uiToastIn {
  from { opacity: 0; transform: translate3d(12px, -4px, 0); }
  to { opacity: 1; transform: translate3d(0, 0, 0); }
}

@keyframes uiModalIn {
  from { opacity: 0; transform: translateY(10px) scale(0.985); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

@keyframes uiFadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .card:hover,
  .client-card:hover,
  .issue:hover,
  .month:hover,
  .btn:hover {
    transform: none !important;
  }
}

@media (forced-colors: active) {
  .pill,
  .source-badge,
  .role-badge,
  .btn,
  .field input,
  .field select,
  .field textarea {
    border: 1px solid CanvasText;
  }
}