/* ============================================================
   Brain-5D Operator Experience — Improved & Refined
   ============================================================
   Base design system with reduced specificity,
   better maintainability, and enhanced performance.
   ============================================================ */

/* ---------- 1. Design Tokens ---------- */
:root {
  /* Color System */
  --exp-bg-0: #061017;
  --exp-bg-1: #0a1822;
  --exp-panel: rgba(9, 27, 38, 0.78);
  --exp-panel-strong: rgba(11, 31, 43, 0.97);
  --exp-line: rgba(89, 151, 172, 0.23);
  --exp-line-strong: rgba(64, 224, 208, 0.42);
  --exp-text: #eef8fb;
  --exp-muted: #8daebb;
  --exp-accent: #40e0d0;
  --exp-blue: #67b7ff;
  --exp-warm: #ffb45b;
  --exp-danger: #ff6c83;

  /* Borders & Radius */
  --exp-radius: 14px;
  --exp-radius-sm: 9px;
  --exp-border: 1px solid var(--exp-line);
  --exp-border-strong: 1px solid var(--exp-line-strong);

  /* Shadows */
  --exp-shadow-glow: 0 0 0 1px rgba(64, 224, 208, 0.05),
    0 18px 55px rgba(0, 0, 0, 0.24);
  --exp-shadow-card: 0 12px 34px rgba(0, 0, 0, 0.12);
  --exp-shadow-card-hover: 0 15px 38px rgba(0, 0, 0, 0.15);
  --exp-shadow-dialog: 0 32px 100px rgba(0, 0, 0, 0.48);

  /* Typography */
  --exp-font-base: clamp(0.78rem, 0.9vw, 0.92rem);
  --exp-font-small: 0.62rem;
  --exp-font-tiny: 0.56rem;

  /* Transitions */
  --exp-transition: 0.25s cubic-bezier(0.2, 0, 0, 1);
}

/* Light Theme Overrides */
body[data-theme="light"] {
  --exp-bg-0: #eef5f7;
  --exp-bg-1: #f9fcfd;
  --exp-panel: rgba(255, 255, 255, 0.91);
  --exp-panel-strong: #ffffff;
  --exp-line: rgba(31, 78, 94, 0.16);
  --exp-line-strong: rgba(8, 127, 120, 0.35);
  --exp-text: #10242f;
  --exp-muted: #526d78;
  --exp-accent: #087f78;
  --exp-blue: #176ca8;
  --exp-warm: #a75b00;
  --exp-danger: #b4233a;
  --exp-shadow-glow: 0 0 0 1px rgba(8, 127, 120, 0.04),
    0 16px 42px rgba(16, 36, 47, 0.09);
}

/* ---------- 2. Base & Reset ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
}

html {
  background: var(--exp-bg-0);
  -webkit-font-smoothing: antialiased;
}

/* ---------- 3. Body & Layout Context ---------- */
.experience-ready {
  display: flex;
  flex-direction: column;
  height: 100vh;
  min-height: 0;
  overflow: hidden;
  color: var(--exp-text);
  background:
    radial-gradient(circle at 14% 0%, color-mix(in srgb, var(--exp-accent) 9%, transparent), transparent 31rem),
    radial-gradient(circle at 86% 8%, color-mix(in srgb, var(--exp-blue) 7%, transparent), transparent 34rem),
    linear-gradient(180deg, var(--exp-bg-1), var(--exp-bg-0) 30rem) fixed;
}

/* Subtle grid overlay */
.experience-ready::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  opacity: 0.17;
  background-image:
    linear-gradient(var(--exp-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--exp-line) 1px, transparent 1px);
  background-size: 42px 42px;
  mask-image: linear-gradient(to bottom, black, transparent 65%);
}

/* ---------- 4. Top Bar ---------- */
.experience-ready .topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: grid;
  grid-template-columns: minmax(220px, 0.75fr) minmax(320px, 1.2fr) auto;
  align-items: center;
  gap: 18px;
  min-height: 76px;
  padding: 12px clamp(14px, 2vw, 30px);
  border-bottom: var(--exp-border);
  background: color-mix(in srgb, var(--exp-panel-strong) 90%, transparent);
  backdrop-filter: blur(24px) saturate(130%);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.13);
}

.experience-ready .topbar-brand {
  min-width: 0;
}

.experience-ready .topbar-brand h1 {
  margin: 1px 0 0;
  font-size: clamp(1rem, 1.35vw, 1.35rem);
  letter-spacing: -0.02em;
}

.experience-ready .topbar-brand .eyebrow {
  color: var(--exp-accent);
  font-size: 0.67rem;
  font-weight: 800;
  letter-spacing: 0.16em;
}

/* Status Cluster */
.experience-status-cluster {
  display: grid;
  grid-template-columns: auto repeat(3, minmax(86px, 1fr));
  align-items: center;
  overflow: hidden;
  border: var(--exp-border);
  border-radius: var(--exp-radius-sm);
  background: color-mix(in srgb, var(--exp-panel) 84%, transparent);
}

.experience-live-dot {
  width: 8px;
  height: 8px;
  margin: 0 13px;
  border-radius: 50%;
  background: var(--exp-accent);
  box-shadow: 0 0 14px color-mix(in srgb, var(--exp-accent) 68%, transparent);
}

.experience-status-copy {
  min-width: 0;
  padding: 7px 11px;
  border-left: var(--exp-border);
}

.experience-status-copy small,
.experience-status-copy strong {
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.experience-status-copy small {
  margin-bottom: 2px;
  color: var(--exp-muted);
  font-size: 0.57rem;
  font-weight: 800;
  letter-spacing: 0.12em;
}

.experience-status-copy strong {
  color: var(--exp-text);
  font-size: 0.76rem;
}

/* Topbar Right Actions */
.experience-ready .topbar-right {
  display: flex;
  align-items: center;
  gap: 6px;
  justify-content: flex-end;
  flex-wrap: wrap;
}

/* ---------- 5. Buttons & Controls ---------- */
.experience-icon-button,
.experience-ready .icon-btn,
.experience-ready .multifunction-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 38px;
  padding: 7px 10px;
  border: var(--exp-border);
  border-radius: 8px;
  background: color-mix(in srgb, var(--exp-panel) 86%, transparent);
  color: var(--exp-text);
  font: inherit;
  font-size: 0.72rem;
  font-weight: 750;
  cursor: pointer;
  transition: border-color var(--exp-transition), background var(--exp-transition);
}

.experience-icon-button:hover,
.experience-icon-button.active,
.experience-ready .icon-btn:hover,
.experience-ready .multifunction-btn:hover {
  border-color: var(--exp-line-strong);
  background: color-mix(in srgb, var(--exp-accent) 10%, var(--exp-panel-strong));
}

/* ---------- 6. Navigation (Tab Nav) ---------- */
.experience-ready .tab-nav {
  position: sticky;
  top: 76px;
  z-index: 18;
  width: calc(100% - clamp(24px, 3vw, 56px));
  margin: 12px auto 16px;
  padding: 5px;
  border: var(--exp-border);
  border-radius: var(--exp-radius);
  background: color-mix(in srgb, var(--exp-panel-strong) 88%, transparent);
  box-shadow: var(--exp-shadow-glow);
  backdrop-filter: blur(22px);
}

.experience-ready .tab-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  min-height: 50px;
  border-radius: 10px;
  transition: background var(--exp-transition), border-color var(--exp-transition);
}

.experience-tab-icon {
  display: grid;
  place-items: center;
  width: 24px;
  height: 24px;
  flex: 0 0 auto;
  border: var(--exp-border);
  border-radius: 7px;
  color: var(--exp-accent);
  font-size: 0.85rem;
}

.experience-tab-copy {
  display: flex;
  min-width: 0;
  flex-direction: column;
  align-items: flex-start;
  gap: 1px;
}

.experience-tab-copy strong {
  color: inherit;
  font-size: 0.75rem;
  letter-spacing: 0.02em;
}

.experience-tab-copy small {
  color: var(--exp-muted);
  font-size: 0.56rem;
  font-weight: 750;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.experience-ready .tab-btn.active .experience-tab-icon {
  border-color: var(--exp-line-strong);
  background: color-mix(in srgb, var(--exp-accent) 12%, transparent);
  box-shadow: 0 0 22px color-mix(in srgb, var(--exp-accent) 10%, transparent);
}

/* ---------- 7. Main Workspace ---------- */
.experience-ready main {
  flex: 1 1 auto;
  padding-top: 0;
  min-height: 0;
  overflow-x: hidden;
  overflow-y: auto;
  overscroll-behavior: contain;
}

.experience-ready .brain5d-primary-nav {
  flex: 0 0 auto;
  position: static;
  width: 100%;
  min-width: 0;
}

/* ---------- 8. Workspace Headers ---------- */
.experience-ready .workspace-header,
.experience-ready .overview-command-bar,
.experience-ready .dashboard-generated-header {
  position: relative;
  overflow: hidden;
  border: var(--exp-border);
  border-radius: var(--exp-radius);
  background:
    linear-gradient(112deg, color-mix(in srgb, var(--exp-accent) 9%, transparent), transparent 34%),
    linear-gradient(180deg, color-mix(in srgb, var(--exp-panel-strong) 92%, transparent), var(--exp-panel));
  box-shadow: var(--exp-shadow-glow);
}

/* Decorative circle */
.experience-ready .workspace-header::after,
.experience-ready .overview-command-bar::after,
.experience-ready .dashboard-generated-header::after {
  content: "";
  position: absolute;
  right: -50px;
  bottom: -100px;
  width: 230px;
  height: 230px;
  border: 1px solid color-mix(in srgb, var(--exp-accent) 17%, transparent);
  border-radius: 50%;
  pointer-events: none;
}

.experience-ready .workspace-header h2,
.experience-ready .overview-command-bar h2,
.experience-ready .dashboard-generated-header h2 {
  font-size: clamp(1.45rem, 2.2vw, 2.35rem);
  letter-spacing: -0.035em;
}

.experience-ready .workspace-header p,
.experience-ready .overview-command-bar p,
.experience-ready .dashboard-generated-header p {
  font-size: var(--exp-font-base);
  line-height: 1.55;
}

/* ---------- 9. Context Ribbon ---------- */
.experience-ribbon {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  width: 100%;
  margin: -2px 0 14px;
  padding: 9px 11px 9px 14px;
  border: var(--exp-border);
  border-left: 3px solid var(--exp-accent);
  border-radius: var(--exp-radius-sm);
  background: color-mix(in srgb, var(--exp-panel) 84%, transparent);
}

.experience-ribbon-copy {
  min-width: 0;
}

.experience-ribbon-copy span,
.experience-ribbon-copy strong {
  display: block;
}

.experience-ribbon-copy span {
  margin-bottom: 2px;
  color: var(--exp-accent);
  font-size: 0.58rem;
  font-weight: 850;
  letter-spacing: 0.14em;
}

.experience-ribbon-copy strong {
  overflow: hidden;
  color: var(--exp-muted);
  font-size: 0.74rem;
  font-weight: 650;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.experience-ribbon-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.experience-ribbon-actions button {
  min-height: 32px;
  padding: 5px 9px;
  border: var(--exp-border);
  border-radius: 7px;
  background: var(--exp-panel-strong);
  color: var(--exp-muted);
  cursor: pointer;
  font: inherit;
  font-size: 0.68rem;
  transition: border-color var(--exp-transition), color var(--exp-transition);
}

.experience-ribbon-actions button:hover,
.experience-ribbon-actions button.active {
  border-color: var(--exp-line-strong);
  color: var(--exp-text);
}

/* ---------- 10. Guided Welcome Panel ---------- */
.experience-welcome {
  position: relative;
  display: grid;
  grid-template-columns: minmax(260px, 0.82fr) minmax(480px, 1.5fr);
  gap: clamp(18px, 2.2vw, 34px);
  margin: 0 0 16px;
  padding: clamp(18px, 2vw, 30px);
  overflow: hidden;
  border: var(--exp-border-strong);
  border-radius: var(--exp-radius);
  background:
    radial-gradient(circle at 10% 0%, color-mix(in srgb, var(--exp-accent) 14%, transparent), transparent 40%),
    var(--exp-panel-strong);
  box-shadow: var(--exp-shadow-glow);
}

.experience-welcome-copy h2 {
  max-width: 15ch;
  margin: 5px 0 10px;
  color: var(--exp-text);
  font-size: clamp(1.35rem, 2vw, 2rem);
  line-height: 1.05;
  letter-spacing: -0.04em;
}

.experience-welcome-copy p {
  max-width: 62ch;
  margin: 0;
  color: var(--exp-muted);
  font-size: 0.8rem;
  line-height: 1.6;
}

.experience-eyebrow {
  color: var(--exp-accent);
  font-size: 0.59rem;
  font-weight: 850;
  letter-spacing: 0.16em;
}

.experience-welcome-steps {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 7px;
}

.experience-welcome-steps button {
  display: flex;
  min-width: 0;
  min-height: 112px;
  flex-direction: column;
  align-items: flex-start;
  justify-content: space-between;
  padding: 12px;
  border: var(--exp-border);
  border-radius: 10px;
  background: color-mix(in srgb, var(--exp-panel) 88%, transparent);
  color: var(--exp-text);
  cursor: pointer;
  text-align: left;
  transition: border-color var(--exp-transition), transform var(--exp-transition);
}

.experience-welcome-steps button:hover {
  border-color: var(--exp-line-strong);
  transform: translateY(-1px);
}

.experience-welcome-steps b {
  color: var(--exp-accent);
  font-size: 0.63rem;
  letter-spacing: 0.09em;
}

.experience-welcome-steps span,
.experience-welcome-steps strong,
.experience-welcome-steps small {
  display: block;
}

.experience-welcome-steps strong {
  margin-bottom: 4px;
  font-size: 0.73rem;
}

.experience-welcome-steps small {
  color: var(--exp-muted);
  font-size: 0.62rem;
  line-height: 1.35;
}

.experience-dismiss {
  position: absolute;
  top: 9px;
  right: 9px;
  width: 30px;
  height: 30px;
  border: var(--exp-border);
  border-radius: 8px;
  background: transparent;
  color: var(--exp-muted);
  cursor: pointer;
  font-size: 1rem;
  transition: border-color var(--exp-transition), color var(--exp-transition);
}

.experience-dismiss:hover {
  border-color: var(--exp-line-strong);
  color: var(--exp-text);
}

/* ---------- 11. Cards & Panels ---------- */
.experience-ready .card,
.experience-ready .panel,
.experience-ready .control-card,
.experience-ready .overview-surface,
.experience-ready .snapshot-info-card,
.experience-ready .settings-section,
.experience-ready .research-section,
.experience-ready .gate-panel,
.experience-ready .embodiment-card {
  border: var(--exp-border);
  border-radius: var(--exp-radius);
  background: linear-gradient(180deg, color-mix(in srgb, var(--exp-panel-strong) 58%, transparent), var(--exp-panel));
  box-shadow: var(--exp-shadow-card);
  transition: border-color var(--exp-transition), box-shadow var(--exp-transition);
}

.experience-ready .card:hover,
.experience-ready .control-card:hover,
.experience-ready .overview-surface:hover {
  border-color: color-mix(in srgb, var(--exp-accent) 35%, var(--exp-line));
  box-shadow: var(--exp-shadow-card-hover);
}

.experience-ready .panel-title,
.experience-ready .overview-surface-title {
  padding-bottom: 9px;
  border-bottom: var(--exp-border);
}

.experience-ready .panel-title h2,
.experience-ready .panel-title h3,
.experience-ready .overview-surface-title h3 {
  letter-spacing: -0.025em;
}

/* ---------- 12. Overview Status Rail ---------- */
.experience-ready .overview-status-rail {
  display: flex;
  gap: 7px;
  margin-bottom: 14px;
}

.experience-ready .overview-status-item {
  flex: 1;
  min-height: 68px;
  padding: 10px 12px;
  border: var(--exp-border);
  border-radius: 10px;
  background: var(--exp-panel);
}

.experience-ready .overview-status-item span {
  color: var(--exp-muted);
  font-size: 0.62rem;
  font-weight: 750;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.experience-ready .overview-status-item strong {
  display: block;
  margin-top: 6px;
  font-size: 0.88rem;
}

/* ---------- 13. Utility Bars ---------- */
.experience-ready .workspace-view-tabs,
.experience-ready .workspace-jumps,
.experience-ready .dashboard-utility-bar {
  border: var(--exp-border);
  background: color-mix(in srgb, var(--exp-panel) 86%, transparent);
  box-shadow: none;
}

/* ---------- 14. Unknown State ---------- */
.experience-unknown-state {
  color: var(--exp-muted);
  text-decoration: underline dotted color-mix(in srgb, var(--exp-muted) 45%, transparent);
  text-underline-offset: 3px;
}

/* ---------- 15. Dialogs / Command Center ---------- */
.experience-dialog {
  width: min(760px, calc(100vw - 28px));
  max-height: min(78vh, 760px);
  padding: 0;
  overflow: hidden;
  border: var(--exp-border-strong);
  border-radius: 16px;
  background: var(--exp-panel-strong);
  color: var(--exp-text);
  box-shadow: var(--exp-shadow-dialog);
}

.experience-dialog::backdrop {
  background: rgba(1, 8, 13, 0.7);
  backdrop-filter: blur(8px);
}

.experience-dialog-frame {
  display: flex;
  max-height: inherit;
  flex-direction: column;
}

.experience-dialog header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  padding: 18px 20px 14px;
  border-bottom: var(--exp-border);
}

.experience-dialog header h2 {
  margin: 3px 0 0;
  font-size: 1.15rem;
}

.experience-dialog header > button {
  width: 32px;
  height: 32px;
  border: var(--exp-border);
  border-radius: 8px;
  background: transparent;
  color: var(--exp-muted);
  cursor: pointer;
  transition: border-color var(--exp-transition), color var(--exp-transition);
}

.experience-dialog header > button:hover {
  border-color: var(--exp-line-strong);
  color: var(--exp-text);
}

.experience-command-search {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 14px;
  padding: 0 14px;
  border: var(--exp-border-strong);
  border-radius: 10px;
  background: color-mix(in srgb, var(--exp-panel) 88%, transparent);
  color: var(--exp-accent);
}

.experience-command-search input {
  width: 100%;
  min-height: 48px;
  border: 0;
  outline: none;
  background: transparent;
  color: var(--exp-text);
  font: inherit;
}

.experience-command-results {
  min-height: 220px;
  padding: 0 14px 14px;
  overflow: auto;
}

.experience-command-item {
  display: grid;
  grid-template-columns: 36px 1fr auto;
  align-items: center;
  gap: 10px;
  width: 100%;
  margin-bottom: 4px;
  padding: 10px;
  border: 1px solid transparent;
  border-radius: 9px;
  background: transparent;
  color: var(--exp-text);
  cursor: pointer;
  text-align: left;
  transition: border-color var(--exp-transition), background var(--exp-transition);
}

.experience-command-item:hover,
.experience-command-item.selected {
  border-color: var(--exp-line);
  background: color-mix(in srgb, var(--exp-accent) 8%, var(--exp-panel));
}

.experience-command-icon {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border: var(--exp-border);
  border-radius: 8px;
  color: var(--exp-accent);
}

.experience-command-item strong,
.experience-command-item small {
  display: block;
}

.experience-command-item strong {
  margin-bottom: 3px;
  font-size: 0.8rem;
}

.experience-command-item small {
  color: var(--exp-muted);
  font-size: 0.67rem;
}

.experience-dialog footer {
  display: flex;
  gap: 16px;
  padding: 10px 14px;
  border-top: var(--exp-border);
  color: var(--exp-muted);
  font-size: 0.63rem;
}

kbd {
  display: inline-grid;
  min-width: 22px;
  min-height: 21px;
  place-items: center;
  padding: 2px 5px;
  border: var(--exp-border);
  border-bottom-color: var(--exp-line-strong);
  border-radius: 5px;
  background: var(--exp-panel);
  color: var(--exp-text);
  font: inherit;
  font-size: 0.61rem;
  box-shadow: inset 0 -1px 0 var(--exp-line);
}

.experience-shortcut-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
  padding: 16px 20px;
}

.experience-shortcut-grid > div {
  display: flex;
  min-height: 54px;
  align-items: center;
  gap: 7px;
  padding: 10px 12px;
  border: var(--exp-border);
  border-radius: 9px;
  background: var(--exp-panel);
}

.experience-shortcut-grid strong {
  margin-left: auto;
  color: var(--exp-muted);
  font-size: 0.7rem;
  font-weight: 650;
}

.experience-integrity-note {
  margin: 0;
  padding: 13px 20px 17px;
  border-top: var(--exp-border);
  color: var(--exp-muted);
  font-size: 0.7rem;
  line-height: 1.5;
}

/* ---------- 16. Focus Mode ---------- */
[data-experience-focus="true"] .topbar-brand .icon-btn,
[data-experience-focus="true"] .topbar-brand .eyebrow,
[data-experience-focus="true"] .header-context,
[data-experience-focus="true"] .dashboard-utility-bar,
[data-experience-focus="true"] .experience-welcome {
  display: none !important;
}

[data-experience-focus="true"] .topbar {
  grid-template-columns: minmax(180px, 0.5fr) minmax(320px, 1fr) auto;
}

[data-experience-focus="true"] .tab-nav {
  opacity: 0.72;
  transition: opacity var(--exp-transition);
}

[data-experience-focus="true"] .tab-nav:hover,
[data-experience-focus="true"] .tab-nav:focus-within {
  opacity: 1;
}

/* ---------- 17. Footer ---------- */
.experience-ready .site-footer {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  grid-template-rows: auto auto;
  width: 100%;
  margin-top: 18px;
  padding: 0;
  gap: 1px;
  background: var(--exp-line);
}

.experience-ready .site-footer .footer-segment,
.experience-ready .site-footer .footer-vitals,
.experience-ready .site-footer .footer-io {
  min-width: 0;
  min-height: 34px;
  padding: 4px 8px;
  overflow: hidden;
  background: color-mix(in srgb, var(--exp-panel-strong) 94%, transparent);
  font-size: 0.65rem;
}

/* Grid placement */
.experience-ready .site-footer > .footer-product { grid-column: 1; grid-row: 1; }
.experience-ready .site-footer > .footer-runtime { grid-column: 2; grid-row: 1; }
.experience-ready .site-footer > .footer-io { grid-column: 3; grid-row: 1; }
.experience-ready .site-footer > .footer-experiment { grid-column: 4; grid-row: 1; }
.experience-ready .site-footer > .footer-mode { grid-column: 5; grid-row: 1; }
.experience-ready .site-footer > .footer-health { grid-column: 6; grid-row: 1; }
.experience-ready .site-footer > .footer-vitals { grid-column: 1 / 7; grid-row: 2; }

/* Vitals grid */
.experience-ready .site-footer .footer-vitals {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.experience-ready .site-footer .footer-vital {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 2px 6px;
  min-width: 0;
  color: var(--exp-muted);
  font-size: 7px;
  text-transform: uppercase;
}

.experience-ready .site-footer .footer-vital strong {
  color: var(--exp-text);
  font-size: 8px;
  font-weight: 700;
}

.experience-ready .site-footer .footer-vital i {
  grid-column: 1 / -1;
  display: block;
  height: 3px;
  overflow: hidden;
  border-radius: 2px;
  background: color-mix(in srgb, var(--exp-line) 55%, transparent);
}

.experience-ready .site-footer .footer-vital b {
  display: block;
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--exp-accent), var(--exp-warm));
  transition: width 0.35s ease;
}

.experience-ready .site-footer .footer-vitals.is-test-running .footer-vital:nth-child(1) strong,
.experience-ready .site-footer .footer-vitals.is-test-running .footer-vital:nth-child(2) strong {
  color: var(--exp-accent);
}

.experience-ready .site-footer .footer-vitals.is-test-running .footer-vital:nth-child(1) b,
.experience-ready .site-footer .footer-vitals.is-test-running .footer-vital:nth-child(2) b {
  animation: footer-test-activity 1.1s ease-in-out infinite alternate;
}

@keyframes footer-test-activity {
  from { opacity: 0.45; transform: scaleX(0.72); transform-origin: left; }
  to { opacity: 1; transform: scaleX(1); transform-origin: left; }
}

.experience-ready .site-footer .footer-io {
  display: flex;
  align-items: center;
  gap: 10px;
  justify-content: space-between;
}

.experience-ready .site-footer .footer-io em,
.experience-ready .site-footer .footer-io strong,
.experience-ready .site-footer .footer-experiment-id {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* Footer runtime actions */
.experience-ready .footer-runtime {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 4px;
}

.experience-ready .footer-runtime-actions {
  display: inline-flex;
  gap: 2px;
  margin-left: auto;
}

.experience-ready .footer-runtime-actions button {
  display: grid;
  place-items: center;
  width: 20px;
  height: 20px;
  min-width: 20px;
  min-height: 20px;
  padding: 0;
  border: var(--exp-border);
  border-radius: 5px;
  background: color-mix(in srgb, var(--exp-panel) 86%, transparent);
  color: var(--exp-text);
  cursor: pointer;
  font: 700 0.62rem/1 var(--font-mono, monospace);
  transition: border-color var(--exp-transition), color var(--exp-transition);
}

.experience-ready .footer-runtime-actions button:hover,
.experience-ready .footer-runtime-actions button:focus-visible {
  border-color: var(--exp-line-strong);
  color: var(--exp-accent);
  outline: none;
}

.experience-ready .footer-runtime-actions button:disabled {
  cursor: wait;
  opacity: 0.45;
}

.experience-ready .footer-mode .mode-btn {
  display: grid;
  place-items: center;
  width: 20px;
  height: 20px;
  min-width: 20px;
  min-height: 20px;
  padding: 2px 5px;
  border: var(--exp-border);
  border-radius: 5px;
  background: color-mix(in srgb, var(--exp-panel) 86%, transparent);
  color: var(--exp-text);
  cursor: pointer;
  font: inherit;
  font-size: 0.68rem;
  line-height: 1;
  transition: border-color var(--exp-transition), background var(--exp-transition);
}

.experience-ready .footer-mode .mode-btn:hover {
  border-color: var(--exp-line-strong);
  background: color-mix(in srgb, var(--exp-accent) 10%, var(--exp-panel-strong));
}

/* ---------- 18. Responsive ---------- */

/* Large screens */
@media (min-width: 1600px) {
  .experience-ready main {
    padding-inline: clamp(24px, 2.2vw, 44px);
  }
  .experience-ready .overview-operations-grid {
    gap: 16px;
  }
}

/* 1180px */
@media (max-width: 1180px) {
  .experience-ready .topbar {
    grid-template-columns: minmax(210px, 1fr) auto;
  }
  .experience-status-cluster {
    grid-column: 1 / -1;
    grid-row: 2;
  }
  .experience-ready .tab-nav {
    top: 120px;
  }
  .experience-welcome {
    grid-template-columns: 1fr;
  }
}

/* 820px */
@media (max-width: 820px) {
  .experience-ready .topbar {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    min-height: auto;
  }
  .experience-ready .topbar-brand,
  .experience-ready .topbar-right,
  .experience-ready .experience-status-cluster {
    width: 100%;
  }
  .experience-ready .experience-status-cluster {
    order: 3;
  }
  .experience-ready .topbar-right {
    justify-content: flex-start;
  }
  .experience-ready .tab-nav {
    position: sticky;
    top: 0;
  }
  .experience-welcome-steps {
    grid-template-columns: repeat(2, 1fr);
  }
  .experience-welcome-steps button:last-child {
    grid-column: 1 / -1;
    min-height: 82px;
  }
  .experience-ribbon {
    flex-direction: column;
    align-items: stretch;
  }
  .experience-ribbon-actions > button {
    flex: 1 1 auto;
  }
  .experience-shortcut-grid {
    grid-template-columns: 1fr;
  }
  /* Footer responsive */
  .experience-ready .site-footer {
    grid-template-columns: minmax(0, 1fr) auto;
  }
  .experience-ready .site-footer > .footer-product { grid-column: 1; grid-row: 1; }
  .experience-ready .site-footer > .footer-mode { grid-column: 2; grid-row: 1; }
  .experience-ready .site-footer > .footer-runtime { grid-column: 1 / 3; grid-row: 2; }
  .experience-ready .site-footer > .footer-experiment { grid-column: 1 / 3; grid-row: 3; }
  .experience-ready .site-footer > .footer-vitals { grid-column: 1 / 3; grid-row: 4; }
  .experience-ready .site-footer > .footer-io { grid-column: 1 / 3; grid-row: 5; }
}

/* 520px */
@media (max-width: 520px) {
  .experience-status-cluster {
    grid-template-columns: auto repeat(2, 1fr);
  }
  .experience-status-copy:nth-of-type(4) {
    display: none;
  }
  .experience-tab-copy small {
    display: none;
  }
  .experience-ready .tab-btn {
    min-width: 112px;
  }
  .experience-welcome-steps {
    grid-template-columns: 1fr;
  }
  .experience-welcome-steps button,
  .experience-welcome-steps button:last-child {
    grid-column: auto;
    min-height: 76px;
  }
  .experience-dialog footer {
    flex-wrap: wrap;
  }
  .experience-ready .site-footer .footer-vitals {
    grid-template-columns: 1fr;
    gap: 6px;
  }
  .experience-ready .site-footer .footer-io {
    flex-wrap: wrap;
  }
}

/* ---------- 19. Reduced Motion ---------- */
@media (prefers-reduced-motion: reduce) {
  .experience-welcome-steps button,
  .experience-ready .tab-nav,
  .experience-ready .card,
  .experience-ready .overview-surface {
    transition: none !important;
  }
  .experience-ready .site-footer .footer-vitals.is-test-running .footer-vital:nth-child(1) b,
  .experience-ready .site-footer .footer-vitals.is-test-running .footer-vital:nth-child(2) b {
    animation: none;
  }
}