/* Newfangled design system — internal site for 4K engagement working doc */

:root {
  --bg: #212121;
  --bg-alt: #2D2D2D;
  --bg-subtle: #383838;
  --bg-hover: #424242;
  --bg-dark: #1A1A1A;
  --text: #E0E0E0;
  --text-heading: #FFFFFF;
  --text-dim: #9E9E9E;
  --text-muted: #757575;
  --border: #424242;
  --border-light: #383838;
  --border-rule: #FFFFFF;
  --accent: #1899D4;
  --accent-hover: #1280B5;
  --accent-secondary: #F7BC60;
  --success: #4CAF50;
  --error: #F44336;
  --amber: #FF9800;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html, #root { background: #212121; overflow-x: hidden; }
body {
  font-family: 'IBM Plex Sans', system-ui, sans-serif;
  font-weight: 300;
  font-size: 18px;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

.page-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 24px 20px;
}
@media (min-width: 768px) {
  .page-container { padding: 40px 48px; }
}

/* Logo + top nav */
.logo { margin-bottom: 24px; }
.logo img { display: block; }

.topnav {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  margin-bottom: 48px;
  overflow-x: auto;
}
.topnav a {
  display: inline-block;
  padding: 14px 16px;
  color: var(--text-dim);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.04em;
  border-right: 1px solid var(--border);
  white-space: nowrap;
  transition: all 0.15s;
}
.topnav a:hover { color: var(--text-heading); background: var(--bg-hover); }
.topnav a:last-child { border-right: none; }
.topnav a.current { color: var(--text-heading); border-bottom: 2px solid var(--accent); }

/* Header */
.header {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 32px;
}
.header h1 {
  font-size: 36px;
  font-weight: 200;
  letter-spacing: -0.035em;
  line-height: 1;
  color: var(--text-heading);
}
.header-meta {
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-dim);
}
@media (min-width: 768px) {
  .header {
    flex-direction: row;
    justify-content: space-between;
    align-items: flex-end;
    margin-bottom: 48px;
  }
  .header h1 { font-size: 48px; }
}

/* Intro paragraph */
.intro {
  font-size: 18px;
  font-weight: 300;
  color: var(--text);
  max-width: 900px;
  margin-bottom: 48px;
  line-height: 1.6;
}
.intro strong { color: var(--text-heading); font-weight: 500; }

/* KPI row */
.kpi-row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-bottom: 48px;
}
@media (min-width: 768px) {
  .kpi-row {
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
    margin-bottom: 64px;
  }
}
.kpi {
  padding: 24px 0;
  border-top: 1px solid var(--accent);
  min-width: 0;
}
.kpi-label {
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-heading);
  font-weight: 500;
  margin-bottom: 12px;
}
.kpi-value {
  font-size: 36px;
  font-weight: 200;
  letter-spacing: -0.035em;
  line-height: 1;
  color: var(--text-heading);
  font-variant-numeric: tabular-nums;
  margin-bottom: 8px;
}
@media (min-width: 768px) { .kpi-value { font-size: 48px; } }
.kpi-sub { font-size: 14px; font-weight: 500; color: var(--text-dim); }

/* Section */
.section { margin-bottom: 64px; }
.section-label {
  font-family: 'IBM Plex Sans', system-ui, sans-serif;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-heading);
  margin-bottom: 12px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}
.section-title {
  font-size: 28px;
  font-weight: 200;
  letter-spacing: -0.02em;
  color: var(--text-heading);
  margin-bottom: 24px;
  line-height: 1.15;
}
.section-intro {
  font-size: 18px;
  font-weight: 300;
  color: var(--text);
  max-width: 900px;
  margin-bottom: 32px;
  line-height: 1.6;
}
.section-intro strong { color: var(--text-heading); font-weight: 500; }

/* Two-column / feature blocks */
.two-col {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  margin-bottom: 32px;
}
@media (min-width: 768px) {
  .two-col { grid-template-columns: 1fr 1fr; gap: 48px; margin-bottom: 48px; }
}
.feature {
  padding: 20px 0 24px;
  border-top: 1px solid var(--border);
  min-width: 0;
}
@media (min-width: 768px) { .feature { padding: 24px 0 28px; } }
.feature-label {
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-heading);
  font-weight: 500;
  margin-bottom: 8px;
}
.feature-name {
  font-size: 24px;
  font-weight: 200;
  letter-spacing: -0.015em;
  color: var(--text-heading);
  margin-bottom: 12px;
  line-height: 1.2;
}
.feature p {
  font-size: 16px;
  font-weight: 300;
  color: var(--text);
  line-height: 1.5;
  margin-bottom: 10px;
}
.feature p:last-child { margin-bottom: 0; }
.feature p strong { color: var(--text-heading); font-weight: 500; }
.feature ul { list-style: none; padding: 0; margin-top: 8px; }
.feature ul li {
  font-size: 16px;
  font-weight: 300;
  color: var(--text);
  padding: 4px 0 4px 18px;
  position: relative;
  line-height: 1.5;
}
.feature ul li::before { content: "—"; position: absolute; left: 0; color: var(--accent); font-weight: 500; }

/* Tables */
.table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin: 0 -20px;
  padding: 0 20px;
}
@media (min-width: 768px) {
  .table-wrap { overflow-x: visible; margin: 0; padding: 0; }
}
table {
  width: 100%;
  border-collapse: collapse;
  font-family: 'IBM Plex Sans', system-ui, sans-serif;
  font-weight: 300;
  font-variant-numeric: tabular-nums;
  border-top: 1px solid var(--border-rule);
  margin-bottom: 24px;
}
thead th {
  text-align: left;
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-heading);
  padding: 14px 10px;
  font-weight: 500;
  border-bottom: 1px solid var(--border-light);
  background: var(--bg);
  white-space: nowrap;
  vertical-align: bottom;
}
tbody td {
  font-size: 16px;
  font-weight: 300;
  padding: 14px 10px;
  border-bottom: 1px solid var(--bg-alt);
  color: var(--text);
  word-wrap: break-word;
  overflow-wrap: break-word;
  vertical-align: top;
}
tbody tr:last-child td { border-bottom: none; }
tbody tr:nth-child(even) td { background: rgba(45, 45, 45, 0.5); }
tbody tr:hover td { background: var(--bg-alt); }
table.bordered { border-bottom: 1px solid var(--border-rule); }
tfoot { border-top: 1px solid var(--border-rule); }
tfoot td {
  font-size: 16px;
  font-weight: 500;
  padding: 14px 10px;
  color: var(--text-heading);
}
.num { font-variant-numeric: tabular-nums; white-space: nowrap; }

/* Status badges */
.status {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 2px;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  white-space: nowrap;
}
.status.easy { background: rgba(76, 175, 80, 0.15); color: var(--success); }
.status.moderate { background: rgba(24, 153, 212, 0.15); color: var(--accent); }
.status.hard { background: rgba(255, 152, 0, 0.15); color: var(--amber); }
.status.blocked { background: rgba(244, 67, 54, 0.15); color: var(--error); }
.status.tier { background: rgba(247, 188, 96, 0.15); color: var(--accent-secondary); }
.status.skill { background: rgba(24, 153, 212, 0.15); color: var(--accent); }
.status.connector { background: rgba(76, 175, 80, 0.15); color: var(--success); }
.status.agent { background: rgba(255, 152, 0, 0.15); color: var(--amber); }
.status.app { background: rgba(244, 67, 54, 0.15); color: var(--error); }
.status.config { background: var(--bg-subtle); color: var(--text-dim); }

/* Callouts */
.callout {
  background: var(--bg-alt);
  border-left: 3px solid var(--accent);
  padding: 20px 24px;
  margin-bottom: 32px;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
}
.callout strong { color: var(--text-heading); font-weight: 500; }
.callout.amber { border-left-color: var(--accent-secondary); }
.callout.amber strong { color: var(--accent-secondary); }
.callout.success { border-left-color: var(--success); }
.callout.error { border-left-color: var(--error); }
.callout.success strong { color: var(--success); }

/* Cards (for capabilities page) */
.cards-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  margin-bottom: 48px;
  border-top: 1px solid var(--border);
}
@media (min-width: 768px) {
  .cards-grid { grid-template-columns: 1fr 1fr; gap: 1px; background: var(--border); margin-left: -1px; }
}
.card-item {
  background: var(--bg);
  padding: 20px 0 24px;
  border-bottom: 1px solid var(--border);
  cursor: pointer;
  transition: background 0.15s;
  min-width: 0;
  text-align: left;
  font-family: inherit;
  color: inherit;
  border-left: none;
  border-right: none;
  border-top: none;
  width: 100%;
}
@media (min-width: 768px) {
  .card-item { padding: 24px 24px 28px; border-bottom: none; }
}
.card-item:hover { background: var(--bg-alt); }
.card-item:focus-visible { outline: 2px solid var(--accent); outline-offset: -2px; }
.card-item .card-id {
  font-size: 11px;
  color: var(--accent);
  letter-spacing: 0.08em;
  font-weight: 500;
  text-transform: uppercase;
  display: inline-block;
  margin-right: 8px;
  font-family: ui-monospace, SFMono-Regular, monospace;
}
.card-item .card-title {
  font-size: 18px;
  font-weight: 500;
  color: var(--text-heading);
  margin-top: 6px;
  margin-bottom: 8px;
  line-height: 1.3;
}
.card-item .card-summary {
  font-size: 14px;
  color: var(--text-dim);
  line-height: 1.5;
  margin-bottom: 12px;
}
.card-item .card-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 8px;
}

/* Modal styles (using <dialog>) */
/* IMPORTANT: only apply display/flex when [open] — otherwise we override
   the UA stylesheet's "display: none" for closed dialogs and end up rendering
   every modal stacked at the bottom of the page. */
dialog.modal {
  background: var(--bg-alt);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 0;
  max-width: 900px;
  width: 95%;
  max-height: 85vh;
  padding: 0;
  overflow: hidden;
  margin: auto;
}
dialog.modal[open] {
  display: flex;
  flex-direction: column;
}
dialog.modal::backdrop {
  background: rgba(0, 0, 0, 0.7);
}
.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  padding: 24px 32px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-alt);
  flex-shrink: 0;
  gap: 16px;
}
.modal-header .modal-meta {
  font-size: 12px;
  color: var(--accent);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 500;
  font-family: ui-monospace, SFMono-Regular, monospace;
  margin-bottom: 6px;
}
.modal-header h2 {
  font-size: 24px;
  font-weight: 200;
  letter-spacing: -0.015em;
  color: var(--text-heading);
  line-height: 1.2;
}
.modal-close {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-dim);
  width: 36px;
  height: 36px;
  font-size: 20px;
  cursor: pointer;
  line-height: 1;
  border-radius: 0;
  transition: all 0.15s;
  flex-shrink: 0;
  font-family: inherit;
}
.modal-close:hover { color: var(--text-heading); border-color: var(--text-heading); background: var(--bg-hover); }
.modal-body {
  padding: 24px 32px 32px;
  overflow-y: auto;
  flex: 1;
}
.modal-body .sub-label {
  font-size: 12px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-top: 24px;
  margin-bottom: 8px;
}
.modal-body .sub-label:first-child { margin-top: 0; }
.modal-body p {
  font-size: 15px;
  line-height: 1.6;
  color: var(--text);
  margin-bottom: 10px;
}
.modal-body p strong { color: var(--text-heading); font-weight: 500; }
.modal-body ul { list-style: none; padding: 0; }
.modal-body ul li {
  font-size: 15px;
  line-height: 1.5;
  color: var(--text);
  padding: 4px 0 4px 18px;
  position: relative;
}
.modal-body ul li::before { content: "—"; position: absolute; left: 0; color: var(--accent); font-weight: 500; }
.modal-body ul li strong { color: var(--text-heading); font-weight: 500; }
.modal-body code {
  background: var(--bg-subtle);
  padding: 1px 6px;
  font-size: 13px;
  font-family: ui-monospace, SFMono-Regular, monospace;
  color: var(--text-heading);
}
.modal-body .cite {
  font-size: 13px;
  color: var(--text-dim);
  font-style: italic;
  margin-top: 8px;
  display: block;
}

/* Timeline (used on tiers page) */
.timeline {
  border-top: 1px solid var(--border-rule);
  border-bottom: 1px solid var(--border-rule);
  margin-bottom: 32px;
}
.tl-row {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 24px;
  padding: 24px 0;
  border-bottom: 1px solid var(--border-light);
}
.tl-row:last-child { border-bottom: none; }
.tl-week {
  font-size: 14px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent);
  padding-top: 2px;
}
.tl-content h4 {
  font-size: 20px;
  font-weight: 200;
  color: var(--text-heading);
  margin-bottom: 8px;
  letter-spacing: -0.01em;
}
.tl-content p {
  font-size: 15px;
  color: var(--text);
  line-height: 1.6;
  margin-bottom: 12px;
}
.tl-content ul { list-style: none; padding: 0; }
.tl-content li {
  font-size: 15px;
  font-weight: 300;
  color: var(--text);
  padding: 4px 0 4px 18px;
  position: relative;
  line-height: 1.5;
}
.tl-content li::before { content: "—"; position: absolute; left: 0; color: var(--accent); font-weight: 500; }
.tl-content li strong { color: var(--text-heading); font-weight: 500; }
.tl-content .item-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 8px;
  margin-bottom: 8px;
}
.tl-content .item-tag {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-heading);
  background: var(--bg-subtle);
  padding: 4px 10px;
  letter-spacing: 0.02em;
  font-family: ui-monospace, SFMono-Regular, monospace;
}
.tl-content .item-tag.removed {
  background: rgba(244, 67, 54, 0.15);
  color: var(--error);
  text-decoration: line-through;
}
.tl-content .item-tag.simplified {
  background: rgba(76, 175, 80, 0.15);
  color: var(--success);
}
@media (max-width: 760px) {
  .tl-row { grid-template-columns: 1fr; gap: 8px; }
  .tl-week { padding-top: 0; }
}

/* Page map (for index) */
.pagemap {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--border);
  margin-bottom: 48px;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
@media (min-width: 768px) {
  .pagemap { grid-template-columns: 1fr 1fr; }
}
.pagemap a {
  display: block;
  padding: 28px 32px;
  background: var(--bg);
  text-decoration: none;
  color: inherit;
  transition: background 0.15s;
}
.pagemap a:hover { background: var(--bg-alt); }
.pagemap .pm-num {
  font-size: 12px;
  color: var(--accent);
  letter-spacing: 0.08em;
  font-weight: 500;
  text-transform: uppercase;
  font-family: ui-monospace, SFMono-Regular, monospace;
  display: block;
  margin-bottom: 8px;
}
.pagemap h3 {
  font-size: 24px;
  font-weight: 200;
  letter-spacing: -0.015em;
  color: var(--text-heading);
  margin-bottom: 8px;
  line-height: 1.2;
}
.pagemap p {
  font-size: 14px;
  color: var(--text-dim);
  line-height: 1.5;
}

/* Footer */
.footer-rule {
  border-top: 1px solid var(--border);
  padding-top: 24px;
  margin-top: 48px;
  font-size: 13px;
  color: var(--text-dim);
  letter-spacing: 0.02em;
}

/* Inline links to capability modals (used across pages) */
.cap-link {
  color: var(--accent);
  text-decoration: none;
  font-weight: 500;
  font-family: ui-monospace, SFMono-Regular, monospace;
  font-size: 0.95em;
  border-bottom: 1px solid transparent;
  transition: border-color 0.15s, color 0.15s;
}
.cap-link:hover { color: var(--accent-hover); border-bottom-color: var(--accent); }
.cap-link:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* Quote / citation */
.quote {
  border-left: 3px solid var(--accent);
  padding: 14px 20px;
  margin: 16px 0;
  font-size: 16px;
  font-style: italic;
  color: var(--text);
  background: var(--bg-alt);
}
.quote .attribution {
  display: block;
  margin-top: 8px;
  font-style: normal;
  font-size: 13px;
  color: var(--text-dim);
  font-family: ui-monospace, SFMono-Regular, monospace;
}

/* Tooltips (simple, no JS needed) */
.cite {
  font-size: 13px;
  color: var(--text-dim);
  font-style: italic;
}

/* Animation */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}
.kpi, .feature, .card-item { animation: fadeUp 0.35s ease both; }
.kpi:nth-child(2), .feature:nth-child(2) { animation-delay: 0.05s; }
.kpi:nth-child(3) { animation-delay: 0.10s; }
.kpi:nth-child(4) { animation-delay: 0.15s; }
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

/* Scrollbars */
::-webkit-scrollbar { width: 2px; height: 2px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 0; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }