/* ═══════════════════════════════════════════════════
   Kingston Design System — Tools Suite
   v2.0 | Vanilla CSS | No build step required
   ═══════════════════════════════════════════════════ */

/* ── 1. BRAND + SEMANTIC TOKENS ── */
:root {
  /* Brand palette — extracted from Kingston logo */
  --brand-navy:   #1b3d72;   /* wordmark deep navy */
  --brand-blue:   #0a52a1;   /* primary interactive blue */
  --brand-cyan:   #29aae1;   /* fan icon accent cyan */

  /* Surfaces */
  --bg:           #f0f4f8;
  --bg-subtle:    #e8edf3;
  --surface:      #ffffff;
  --surface-hover:#f8fafc;

  /* Borders */
  --border:       #dde3ed;
  --border-strong:#b8c4d6;

  /* Text */
  --text:         #1a1c21;
  --text-secondary:#4b5563;
  --muted:        #6b7280;

  /* Accent (interactive blue) */
  --accent:       var(--brand-blue);
  --accent-hover: #08408a;
  --accent-muted: rgba(10, 82, 161, 0.10);
  --accent-fg:    #ffffff;

  /* Semantic state */
  --success-bg:   #dcfce7;
  --success-fg:   #166534;
  --warning-bg:   #fef3c7;
  --warning-fg:   #92400e;
  --danger:       #dc2626;
  --danger-bg:    #fee2e2;
  --danger-fg:    #991b1b;
  --info-bg:      #e0f2fe;
  --info-fg:      #0369a1;

  /* Shadows */
  --shadow-xs:    0 1px 2px rgba(0,0,0,.06);
  --shadow-sm:    0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.06);
  --shadow-md:    0 4px 16px rgba(0,0,0,.08), 0 2px 6px rgba(0,0,0,.06);
  --shadow-lg:    0 8px 32px rgba(0,0,0,.10), 0 4px 12px rgba(0,0,0,.08);

  /* Border radius */
  --radius-xs:    4px;
  --radius-sm:    8px;
  --radius-md:    14px;
  --radius-lg:    20px;
  --radius-full:  999px;

  /* Spacing scale */
  --sp-1:  4px;
  --sp-2:  8px;
  --sp-3:  12px;
  --sp-4:  16px;
  --sp-5:  20px;
  --sp-6:  24px;
  --sp-8:  32px;
  --sp-10: 40px;
  --sp-12: 48px;

  /* Typography scale */
  --font-body: system-ui, -apple-system, "Segoe UI", ui-sans-serif, sans-serif;
  --font-mono: ui-monospace, "Cascadia Code", "Fira Code", monospace;
  --text-xs:   0.72rem;
  --text-sm:   0.84rem;
  --text-base: 0.9375rem;  /* 15px */
  --text-md:   1rem;
  --text-lg:   1.05rem;
  --text-xl:   1.25rem;
  --text-2xl:  1.5rem;

  /* Transitions */
  --t-fast:   .12s ease;
  --t-base:   .18s ease;
  --t-slow:   .28s ease;

  /* Layout */
  --topbar-h: 52px;
  --sidebar-w: 260px;
  --page-max:  1440px;
  --content-gap: 14px;
}

/* ── 2. RESET ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
[hidden] { display: none !important; }
html { min-height: 100%; background: var(--bg); scroll-behavior: smooth; }
body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--text);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}
button, input, select, textarea { font: inherit; }
img { max-width: 100%; display: block; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ── 3. APP SHELL LAYOUT ── */

/* Full-page wrapper used by most tool pages */
.app-shell {
  display: grid;
  gap: var(--content-gap);
  padding: var(--content-gap);
  max-width: var(--page-max);
  margin: 0 auto;
  min-height: 100vh;
  align-content: start;
}

/* Two-column layout: sidebar + main */
.app-shell--split {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  gap: var(--content-gap);
  padding: var(--content-gap);
  max-width: var(--page-max);
  margin: 0 auto;
  min-height: 100vh;
  align-items: start;
}

/* Three-column: narrow | main | narrow */
.app-shell--tri {
  display: grid;
  grid-template-columns: 260px 1fr 300px;
  gap: var(--content-gap);
  padding: var(--content-gap);
  max-width: var(--page-max);
  margin: 0 auto;
  min-height: 100vh;
  align-items: start;
}

@media (max-width: 1024px) {
  .app-shell--tri {
    grid-template-columns: 1fr 1fr;
  }
  .app-shell--tri > :last-child {
    grid-column: 1 / -1;
  }
}

@media (max-width: 768px) {
  .app-shell--split,
  .app-shell--tri {
    grid-template-columns: 1fr;
  }
}

/* ── 4. TOP BAR ── */

.topbar {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--topbar-h);
  background: var(--brand-navy);
  border-bottom: 1px solid rgba(255,255,255,.10);
  display: flex;
  align-items: center;
  gap: var(--sp-4);
  padding: 0 var(--sp-5);
  box-shadow: var(--shadow-sm);
}

.topbar__logo {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  text-decoration: none;
}

.topbar__logo img {
  height: 28px;
  width: auto;
  filter: brightness(0) invert(1);
  opacity: .92;
}

.topbar__title {
  font-size: var(--text-sm);
  font-weight: 600;
  color: rgba(255,255,255,.85);
  letter-spacing: .01em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.topbar__divider {
  width: 1px;
  height: 20px;
  background: rgba(255,255,255,.20);
  flex-shrink: 0;
}

.topbar__spacer { flex: 1; }

/* ── 5. CARD ── */

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  border-radius: var(--radius-lg);
  padding: var(--sp-4) var(--sp-5);
  transition: box-shadow var(--t-base);
}
.card:focus-within { box-shadow: var(--shadow-md); }
.card--flat { box-shadow: none; }
.card--raised { box-shadow: var(--shadow-md); }

/* ── 6. STATUS PILL ── */

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: var(--text-xs);
  white-space: nowrap;
}
.status-pill--loading { background: #f1f5f9; color: var(--muted); }
.status-pill--ready   { background: var(--success-bg); color: var(--success-fg); }
.status-pill--warning { background: var(--warning-bg); color: var(--warning-fg); }
.status-pill--error   { background: var(--danger-bg);  color: var(--danger-fg); }
.status-pill--info    { background: var(--info-bg);    color: var(--info-fg); }

/* ── 7. BADGE (inline label, smaller than pill) ── */

.badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  border-radius: var(--radius-xs);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: .02em;
}
.badge--blue    { background: var(--accent-muted); color: var(--accent); }
.badge--green   { background: var(--success-bg);   color: var(--success-fg); }
.badge--yellow  { background: var(--warning-bg);   color: var(--warning-fg); }
.badge--red     { background: var(--danger-bg);    color: var(--danger-fg); }
.badge--neutral { background: #f1f5f9;             color: var(--muted); }

/* ── 8. FORM CONTROLS ── */

label > span {
  display: block;
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: var(--sp-1);
}

input, select, textarea {
  width: 100%;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--border);
  background: #f8fafc;
  color: var(--text);
  transition: border-color var(--t-fast), background var(--t-fast), box-shadow var(--t-fast);
}
input:hover:not(:disabled),
select:hover:not(:disabled),
textarea:hover:not(:disabled) {
  border-color: var(--border-strong);
  background: var(--surface);
}
input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--accent);
  background: var(--surface);
  box-shadow: 0 0 0 3px var(--accent-muted);
}
input:disabled, select:disabled, textarea:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  background: #f1f5f9;
}
textarea { resize: vertical; min-height: 80px; }

/* Number input — mono font for precision */
input[type="number"] { font-family: var(--font-mono); }

/* ── 9. BUTTONS ── */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-weight: 600;
  font-size: var(--text-sm);
  padding: 10px 20px;
  white-space: nowrap;
  transition: background var(--t-fast), transform var(--t-fast), box-shadow var(--t-fast), color var(--t-fast);
  user-select: none;
}
.btn:disabled { opacity: 0.45; cursor: not-allowed; pointer-events: none; }
.btn:active:not(:disabled) { transform: translateY(1px); }

/* Legacy aliases kept for backward compat */
.primary-button { composes-from: .btn; }
.secondary-button { composes-from: .btn; }

.btn--primary, .primary-button {
  background: var(--accent);
  color: var(--accent-fg);
}
.btn--primary:hover:not(:disabled), .primary-button:hover:not(:disabled) {
  background: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(10,82,161,.30);
}

.btn--secondary, .secondary-button {
  background: var(--surface);
  color: var(--accent);
  border: 1.5px solid var(--border);
}
.btn--secondary:hover:not(:disabled), .secondary-button:hover:not(:disabled) {
  background: var(--accent-muted);
  border-color: var(--accent);
  transform: translateY(-1px);
}

.btn--ghost {
  background: transparent;
  color: var(--text-secondary);
  border: 1.5px solid var(--border);
}
.btn--ghost:hover:not(:disabled) {
  background: var(--surface-hover);
  color: var(--text);
}

.btn--danger {
  background: var(--danger);
  color: #fff;
}
.btn--danger:hover:not(:disabled) {
  background: #b91c1c;
  transform: translateY(-1px);
}

.btn--sm { padding: 6px 14px; font-size: var(--text-xs); }
.btn--lg { padding: 13px 28px; font-size: var(--text-md); }
.btn--icon { padding: 8px; border-radius: var(--radius-sm); }

/* ── 10. PANEL HEADER ── */

.panel-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--sp-3);
  margin-bottom: var(--sp-3);
  flex-shrink: 0;
}
.panel-title { min-width: 0; }
.panel-title h1,
.panel-title h2 {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  margin: 0;
  color: var(--text);
  font-size: var(--text-lg);
  font-weight: 700;
  line-height: 1.2;
}
.panel-title h1 img,
.panel-title h2 img {
  width: 22px;
  height: 22px;
  object-fit: contain;
  flex-shrink: 0;
}
.panel-title p {
  margin-top: 4px;
  font-size: var(--text-sm);
  color: var(--muted);
}

/* ── 11. SECTION HEADER ── */

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 2px 0 8px;
  flex-shrink: 0;
}
.section-title {
  font-weight: 600;
  font-size: var(--text-sm);
  letter-spacing: .01em;
  color: var(--muted);
  text-transform: none;
}
.item-count {
  font-size: var(--text-xs);
  color: var(--muted);
  background: #f1f5f9;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  font-variant-numeric: tabular-nums;
}

/* ── 12. DATA TABLE ── */

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

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
  font-variant-numeric: tabular-nums;
}

.data-table thead {
  background: #f1f5f9;
  position: sticky;
  top: 0;
  z-index: 1;
}

.data-table th {
  padding: 9px 12px;
  text-align: left;
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: .04em;
  text-transform: uppercase;
  color: var(--muted);
  white-space: nowrap;
  border-bottom: 1px solid var(--border);
}

.data-table td {
  padding: 9px 12px;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
  color: var(--text);
}

.data-table tbody tr:last-child td { border-bottom: none; }
.data-table tbody tr:hover td { background: var(--surface-hover); }

.data-table tfoot td {
  padding: 9px 12px;
  font-weight: 700;
  border-top: 2px solid var(--border-strong);
  background: #f8fafc;
}

/* Column alignment helpers */
.data-table .col-num { text-align: right; font-family: var(--font-mono); }
.data-table .col-center { text-align: center; }
.data-table .col-action { text-align: center; width: 1%; white-space: nowrap; }

/* Row states */
.data-table tr.is-selected td { background: var(--accent-muted); }
.data-table tr.is-error td { background: var(--danger-bg); }
.data-table tr.is-warning td { background: var(--warning-bg); }

/* ── 13. SUMMARY STAT CARDS ── */

.summary-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: var(--sp-3);
}

.summary-stat-card {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface);
}

.summary-stat-label {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: .05em;
  text-transform: uppercase;
  color: var(--muted);
}

.summary-stat-value {
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--accent);
  line-height: 1.2;
  font-variant-numeric: tabular-nums;
}

.summary-stat-unit {
  font-size: var(--text-xs);
  color: var(--muted);
}

/* ── 14. COLLAPSIBLE / ACCORDION ── */

.results-collapsible {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface);
  overflow: hidden;
}

.results-collapsible-header {
  list-style: none;
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  padding: 11px 14px;
  cursor: pointer;
  font-weight: 700;
  font-size: var(--text-sm);
  user-select: none;
  transition: background var(--t-fast);
}
.results-collapsible-header::-webkit-details-marker { display: none; }
.results-collapsible-header:hover { background: var(--surface-hover); }

.results-collapsible-header .toggle-icon {
  display: inline-flex;
  align-items: center;
  color: var(--muted);
  flex-shrink: 0;
  transition: transform var(--t-fast);
}
.results-collapsible[open] .results-collapsible-header .toggle-icon {
  transform: rotate(180deg);
}

.results-collapsible-body {
  border-top: 1px solid var(--border);
  padding: 10px 12px;
  display: grid;
  gap: var(--sp-2);
}

/* ── 15. EMPTY STATE / ERROR STATE ── */

.empty-state,
.error-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  min-height: 240px;
  padding: var(--sp-10) var(--sp-6);
  color: var(--muted);
}
.empty-state--wide { min-height: 100%; }

.empty-state-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--sp-4);
  color: var(--accent);
  background: var(--accent-muted);
}

.empty-state h4,
.error-state h4 {
  margin-bottom: var(--sp-2);
  color: var(--text);
  font-size: var(--text-md);
}
.empty-state p,
.error-state p {
  max-width: 36ch;
  line-height: 1.55;
}
.error-state .error-detail {
  margin-top: var(--sp-3);
  max-width: 46ch;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  background: var(--danger-bg);
  color: var(--danger-fg);
  font-size: var(--text-sm);
  white-space: pre-wrap;
  word-break: break-word;
}

/* ── 16. SKELETON LOADER ── */

@keyframes shimmer {
  from { background-position: -400px 0; }
  to   { background-position:  400px 0; }
}

.skeleton {
  display: block;
  border-radius: var(--radius-xs);
  background: linear-gradient(
    90deg,
    #e2e8f0 25%,
    #f1f5f9 50%,
    #e2e8f0 75%
  );
  background-size: 800px 100%;
  animation: shimmer 1.4s ease-in-out infinite;
}
.skeleton--text  { height: 14px; }
.skeleton--title { height: 20px; width: 55%; }
.skeleton--btn   { height: 38px; width: 120px; border-radius: var(--radius-sm); }
.skeleton--row   { height: 40px; border-radius: 0; }

@media (prefers-reduced-motion: reduce) {
  .skeleton { animation: none; }
}

/* ── 17. TOAST NOTIFICATION ── */

.toast-container {
  position: fixed;
  bottom: var(--sp-6);
  right: var(--sp-5);
  z-index: 9000;
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
  pointer-events: none;
}

.toast {
  pointer-events: all;
  display: flex;
  align-items: flex-start;
  gap: var(--sp-3);
  padding: 12px 16px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  font-size: var(--text-sm);
  font-weight: 500;
  min-width: 260px;
  max-width: 380px;
  border: 1px solid transparent;
  animation: toast-in var(--t-slow) ease;
}

@keyframes toast-in {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}

.toast--success { background: var(--success-bg); color: var(--success-fg); border-color: #bbf7d0; }
.toast--warning { background: var(--warning-bg); color: var(--warning-fg); border-color: #fde68a; }
.toast--error   { background: var(--danger-bg);  color: var(--danger-fg);  border-color: #fca5a5; }
.toast--info    { background: var(--info-bg);    color: var(--info-fg);    border-color: #7dd3fc; }
.toast--neutral { background: var(--surface);    color: var(--text);       border-color: var(--border); }

.toast__close {
  margin-left: auto;
  flex-shrink: 0;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  color: inherit;
  opacity: .6;
  line-height: 1;
}
.toast__close:hover { opacity: 1; }

@media (prefers-reduced-motion: reduce) {
  .toast { animation: none; }
}

/* ── 18. PROGRESS BAR ── */

.progress-bar {
  height: 6px;
  border-radius: var(--radius-full);
  background: #e2e8f0;
  overflow: hidden;
}
.progress-bar__fill {
  height: 100%;
  border-radius: var(--radius-full);
  background: var(--accent);
  transition: width .3s ease;
}
.progress-bar--sm { height: 4px; }
.progress-bar--lg { height: 10px; }

/* ── 19. DIVIDER ── */

.divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: var(--sp-4) 0;
}
.divider--strong { border-color: var(--border-strong); }

/* ── 20. UTILITY CLASSES ── */

/* Flex helpers */
.flex        { display: flex; }
.flex-col    { display: flex; flex-direction: column; }
.items-center{ align-items: center; }
.items-start { align-items: flex-start; }
.justify-between { justify-content: space-between; }
.justify-end { justify-content: flex-end; }
.gap-1  { gap: var(--sp-1); }
.gap-2  { gap: var(--sp-2); }
.gap-3  { gap: var(--sp-3); }
.gap-4  { gap: var(--sp-4); }
.flex-1 { flex: 1; }
.flex-wrap { flex-wrap: wrap; }
.shrink-0 { flex-shrink: 0; }

/* Text helpers */
.text-xs   { font-size: var(--text-xs); }
.text-sm   { font-size: var(--text-sm); }
.text-base { font-size: var(--text-base); }
.text-lg   { font-size: var(--text-lg); }
.text-xl   { font-size: var(--text-xl); }
.text-muted    { color: var(--muted); }
.text-accent   { color: var(--accent); }
.text-danger   { color: var(--danger); }
.font-mono     { font-family: var(--font-mono); }
.font-bold     { font-weight: 700; }
.font-semibold { font-weight: 600; }
.tabular-nums  { font-variant-numeric: tabular-nums; }
.truncate { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* Spacing helpers */
.mt-2 { margin-top: var(--sp-2); }
.mt-3 { margin-top: var(--sp-3); }
.mt-4 { margin-top: var(--sp-4); }
.mb-2 { margin-bottom: var(--sp-2); }
.mb-3 { margin-bottom: var(--sp-3); }
.mb-4 { margin-bottom: var(--sp-4); }
.p-4  { padding: var(--sp-4); }
.p-3  { padding: var(--sp-3); }

/* Visibility */
.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;
}
.hidden { display: none !important; }

/* ── 21. RESPONSIVE BREAKPOINTS ── */

/* Mobile-first: base styles apply to all.
   Use these classes to hide/show at breakpoints. */

@media (max-width: 768px) {
  :root { --content-gap: 10px; }

  .app-shell { padding: var(--sp-3); gap: var(--sp-3); }

  .summary-stats { grid-template-columns: repeat(2, 1fr); }

  .hide-mobile { display: none !important; }

  .card { padding: var(--sp-3) var(--sp-4); border-radius: var(--radius-md); }

  .toast-container { left: var(--sp-3); right: var(--sp-3); bottom: var(--sp-4); }
  .toast { min-width: unset; max-width: 100%; }
}

@media (min-width: 769px) {
  .hide-desktop { display: none !important; }
}

@media (max-width: 480px) {
  .summary-stats { grid-template-columns: 1fr 1fr; }
  .data-table th,
  .data-table td { padding: 7px 8px; }
}