:root {
  /* Global theme reset (light, blue-only system) */
  --bg: #ffffff;
  --bg-2: #f7f9fc;
  --surface: #ffffff;
  --surface-2: #ffffff;

  --ink: #0a0a0a;
  --text-2: #4a5568;
  --muted: #94a3b8;

	  --primary: #2563eb;
	  --primary-hover: #1d4ed8;
	  --primary-soft: #dbeafe;
	  --accent: #dc2626;
	  --accent-hover: #b91c1c;
	  --accent-soft: #fee2e2;
	  --secondary: #3b82f6;
	  --tertiary: #93c5fd;

  --line: #e5e7eb;
  --shadow: 0 4px 20px rgba(0, 0, 0, 0.05);

  /* Graph palette */
  --graph-main: #2563eb;
  --graph-cluster: #3b82f6;
  --graph-node: #93c5fd;
  --graph-inactive: #cbd5f5;
  --graph-link: rgba(37, 99, 235, 0.2);
  --graph-link-active: rgba(37, 99, 235, 0.6);
  --graph-outline: rgba(37, 99, 235, 0.25);

  --radius-xl: 28px;
  --radius-lg: 18px;
  --radius-md: 14px;

  --sidebar-w: 280px;
  --max: 1240px;
  --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono",
    "Courier New", monospace;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--ink);
  font-family: Inter, system-ui, -apple-system, "SF Pro Display", "SF Pro Text", "Segoe UI", Roboto,
    Helvetica, Arial, sans-serif;
  text-rendering: optimizeLegibility;
}

body[data-mode="brain"] {
  background: var(--bg);
  color: var(--ink);
}

a {
  color: inherit;
}

.os-shell {
  display: grid;
  grid-template-columns: var(--sidebar-w) minmax(0, 1fr);
  min-height: 100vh;
}

/* Brain Mode is the homepage experience: keep it immersive. */
body[data-mode="brain"] .os-shell {
  grid-template-columns: 1fr;
}

body[data-mode="brain"] .sidebar {
  display: none;
}

body[data-mode="brain"] .topbar {
  display: none;
}

body[data-mode="brain"] .view-root {
  width: 100%;
}

.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  padding: 18px 16px;
  border-right: 1px solid var(--line);
  background: var(--surface);
}

.brand {
  position: relative;
  padding: 14px 14px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.brand .eyebrow {
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 11px;
  color: var(--muted);
}

.brand .title {
  margin: 8px 0 0;
  font-family: inherit;
  letter-spacing: 0.02em;
  font-size: 20px;
  font-weight: 650;
  line-height: 1.2;
}

.nav {
  margin-top: 14px;
  display: grid;
  gap: 6px;
}

.nav-button {
  appearance: none;
  border: 1px solid transparent;
  background: transparent;
  color: inherit;
  text-align: left;
  padding: 10px 12px;
  border-radius: 999px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.nav-button small {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--muted);
}

.nav-button:hover {
  background: var(--primary-soft);
  border-color: rgba(37, 99, 235, 0.25);
}

.nav-button[aria-current="page"] {
  background: var(--primary-soft);
  border-color: rgba(37, 99, 235, 0.35);
}

.sidebar-foot {
  margin-top: auto;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  display: grid;
  gap: 10px;
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--bg-2);
  font-size: 12px;
  color: var(--text-2);
}

.pill strong {
  color: var(--ink);
  font-weight: 700;
}

.main {
  min-width: 0;
  padding: 18px 18px 34px;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  padding: 14px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background: var(--surface);
  box-shadow: var(--shadow);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.mode-toggle {
  display: inline-flex;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--bg-2);
  overflow: hidden;
}

.mode-toggle button {
  appearance: none;
  border: 0;
  background: transparent;
  color: inherit;
  padding: 10px 12px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.mode-toggle button[aria-pressed="true"] {
  background: var(--primary-soft);
}

.topbar-right {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.search {
  width: min(420px, 54vw);
  padding: 10px 12px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink);
  font-size: 13px;
}

.view-root {
  margin-top: 16px;
  width: min(100%, var(--max));
}

.page-head {
  display: grid;
  gap: 6px;
  padding: 18px 4px 10px;
}

.page-head .kicker {
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.22em;
  font-size: 11px;
  color: var(--muted);
}

.page-head h1 {
  margin: 0;
  font-family: inherit;
  font-weight: 650;
  letter-spacing: -0.02em;
  line-height: 1.1;
  font-size: clamp(32px, 4vw, 40px);
}

.page-head p {
  margin: 0;
  max-width: 70ch;
  color: var(--text-2);
  line-height: 1.65;
  font-size: 15px;
}

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

.card {
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background: var(--surface);
  box-shadow: var(--shadow);
  padding: 16px;
  min-width: 0;
  transition: border-color 160ms ease, transform 160ms ease;
}

.card:hover {
  border-color: rgba(37, 99, 235, 0.28);
}

.card h3 {
  margin: 0;
  font-size: 14px;
  letter-spacing: 0.01em;
}

.card .sub {
  margin: 8px 0 0;
  color: var(--text-2);
  font-size: 13px;
  line-height: 1.55;
}

.kpi {
  display: grid;
  gap: 6px;
  padding: 14px;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: var(--bg-2);
}

.kpi .label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--muted);
}

.kpi .value {
  font-size: 20px;
  font-weight: 650;
  letter-spacing: -0.02em;
}

.kpi .trend {
  font-size: 12px;
  font-family: var(--mono);
  color: var(--muted);
}

.table {
  width: 100%;
  border-collapse: collapse;
  overflow: hidden;
  border-radius: 18px;
  border: 1px solid var(--line);
}

.table th,
.table td {
  text-align: left;
  padding: 12px 12px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
  font-size: 13px;
}

.table th {
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 11px;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid var(--line);
  font-size: 12px;
  background: var(--bg-2);
  color: var(--text-2);
}

.tag.is-critical {
  border-color: rgba(37, 99, 235, 0.22);
  background: rgba(37, 99, 235, 0.08);
  color: var(--primary);
}

.button {
  appearance: none;
  border: 1px solid var(--line);
  background: var(--surface);
  padding: 10px 12px;
  border-radius: 999px;
  font-weight: 650;
  letter-spacing: 0.01em;
  font-size: 13px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  text-decoration: none;
  transition: transform 160ms ease, background-color 160ms ease, border-color 160ms ease;
}

.button:hover {
  transform: translateY(-1px);
  border-color: rgba(37, 99, 235, 0.28);
  background: var(--bg-2);
}

.button:active {
  transform: translateY(0);
}

.button.primary {
  border-color: rgba(37, 99, 235, 0.45);
  background: var(--primary);
  color: #ffffff;
}

.button.primary:hover {
  background: var(--primary-hover);
  border-color: rgba(29, 78, 216, 0.6);
}

.field {
  display: grid;
  gap: 6px;
  font-size: 12px;
  color: var(--text-2);
}

.field input,
.field select,
.field textarea {
  width: 100%;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: var(--surface);
  padding: 10px 12px;
  font: inherit;
  color: var(--ink);
}

.brain-layout {
  position: relative;
  display: grid;
  gap: 12px;
  align-items: start;
  width: min(100%, var(--max));
  margin: 0 auto;
  min-height: calc(100vh - 36px);
}

.studio-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 8px 4px 0;
}

.studio-brand {
  display: grid;
  gap: 2px;
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: 0.22em;
  font-weight: 750;
  font-size: 12px;
  color: var(--ink);
}

.studio-brand-name {
  line-height: 1.1;
}

.studio-brand-sub {
  text-transform: none;
  letter-spacing: 0.02em;
  font-weight: 600;
  font-size: 12px;
  color: var(--text-2);
}

.studio-header-actions {
  display: flex;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.studio-hero {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 26px;
  align-items: stretch;
  padding: 10px 4px 0;
  min-height: calc(100vh - 92px);
}

.frontdesk {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 18px;
  padding: 6px 0;
}

.frontdesk-top {
  max-width: 64ch;
  display: grid;
  gap: 10px;
}

.frontdesk-label {
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.22em;
  font-size: 11px;
  color: var(--muted);
}

.frontdesk-title {
  margin: 0;
  font-size: clamp(34px, 4vw, 40px);
  font-weight: 650;
  letter-spacing: -0.02em;
  line-height: 1.08;
}

.frontdesk-sub {
  margin: 0;
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-2);
  max-width: 50ch;
}

.frontdesk-actions {
  margin-top: 10px;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: center;
}

.frontdesk-pulse {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  max-width: 760px;
}

.frontdesk-pulse-row {
  border-top: 1px solid var(--line);
  padding-top: 12px;
  display: grid;
  gap: 6px;
}

.frontdesk-pulse-kicker {
  text-transform: uppercase;
  letter-spacing: 0.2em;
  font-size: 11px;
  color: var(--muted);
}

.frontdesk-pulse-value {
  font-size: 14px;
  font-weight: 650;
  letter-spacing: -0.01em;
  line-height: 1.25;
}

.frontdesk-pulse-note {
  font-size: 13px;
  line-height: 1.55;
  color: var(--text-2);
}

.frontdesk-guide {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  max-width: 760px;
}

.frontdesk-guide-item {
  appearance: none;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--surface);
  color: var(--ink);
  padding: 12px 13px;
  text-align: left;
  display: grid;
  gap: 6px;
  cursor: pointer;
  transition: transform 160ms ease, border-color 160ms ease, background-color 160ms ease,
    box-shadow 160ms ease;
}

.frontdesk-guide-item:hover {
  transform: translateY(-1px);
  background: var(--bg-2);
  border-color: rgba(37, 99, 235, 0.28);
  box-shadow: var(--shadow);
}

.frontdesk-guide-item:focus-visible {
  outline: 2px solid rgba(37, 99, 235, 0.22);
  outline-offset: 2px;
}

.frontdesk-guide-label {
  font-size: 14px;
  font-weight: 650;
  letter-spacing: -0.01em;
  line-height: 1.2;
}

.frontdesk-guide-note {
  font-size: 13px;
  line-height: 1.5;
  color: var(--text-2);
}

.hero-graph {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 0;
}

.brain-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 14px;
  padding: 4px 4px 0;
}

.brain-head-label {
  display: grid;
  gap: 2px;
}

.brain-head-name {
  font-size: 18px;
  font-weight: 650;
  letter-spacing: -0.01em;
  line-height: 1.2;
}

.brain-head-desc {
  font-size: 13px;
  color: var(--text-2);
  line-height: 1.35;
}

.brain-head-proofs {
  margin-top: 6px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.brain-proof {
  display: inline-flex;
  align-items: center;
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid rgba(37, 99, 235, 0.18);
  background: var(--primary-soft);
  color: var(--primary);
  font-size: 12px;
  font-weight: 600;
}

.brain-head-actions {
  display: flex;
  gap: 8px;
  align-items: center;
}

.ghost-button {
  appearance: none;
  border: 1px solid transparent;
  background: transparent;
  color: var(--text-2);
  padding: 8px 10px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 13px;
  cursor: pointer;
  text-decoration: none;
  transition: background-color 160ms ease, border-color 160ms ease, color 160ms ease;
}

.ghost-button:hover {
  background: var(--primary-soft);
  border-color: rgba(37, 99, 235, 0.22);
  color: var(--primary);
}

.brain-stage {
  position: relative;
  --focus: var(--primary);
  border-radius: var(--radius-xl);
  overflow: hidden;
  height: min(84vh, 940px);
  border: 1px solid var(--line);
  background-color: var(--surface);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='48' height='48' viewBox='0 0 48 48'%3E%3Cpath d='M48 0H0V48' fill='none' stroke='%23E5E7EB' stroke-width='1' stroke-opacity='0.22'/%3E%3C/svg%3E");
  background-size: 32px 32px;
}

.brain-stage--split {
  width: 100%;
  height: 100%;
  min-height: 560px;
}

.studio-lobby {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 12px;
  padding: 0 4px;
}

.lobby-item {
  grid-column: span 6;
  appearance: none;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink);
  padding: 14px 14px 13px;
  border-radius: var(--radius-xl);
  text-align: left;
  cursor: pointer;
  display: grid;
  gap: 6px;
  transition: transform 160ms ease, background-color 160ms ease, border-color 160ms ease, box-shadow 160ms ease;
}

.lobby-item:hover {
  transform: translateY(-1px);
  background: var(--bg-2);
  border-color: rgba(37, 99, 235, 0.28);
  box-shadow: var(--shadow);
}

.lobby-item:active {
  transform: translateY(0);
}

.lobby-item:focus-visible {
  outline: 2px solid rgba(37, 99, 235, 0.25);
  outline-offset: 2px;
}

.lobby-item--now {
  grid-column: span 7;
  background: var(--primary-soft);
  border-color: rgba(37, 99, 235, 0.22);
}

.studio-lobby > .lobby-item:nth-child(2) {
  grid-column: span 5;
}

.lobby-kicker {
  text-transform: uppercase;
  letter-spacing: 0.22em;
  font-size: 11px;
  color: var(--muted);
}

.lobby-item--now .lobby-kicker {
  color: var(--primary);
}

.lobby-title {
  font-size: 16px;
  font-weight: 650;
  letter-spacing: -0.01em;
  line-height: 1.2;
}

.lobby-item--now .lobby-title {
  font-size: 18px;
}

.lobby-meta {
  font-size: 13px;
  color: var(--text-2);
  line-height: 1.35;
}

.studio-secondary {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  padding: 0 4px;
}

.studio-secondary .ghost-button {
  padding: 8px 10px;
  font-size: 12px;
}

.studio-strip {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  padding: 0 4px;
}

.strip-button {
  appearance: none;
  border: 1px solid var(--line);
  background: var(--bg-2);
  color: var(--text-2);
  padding: 10px 12px;
  border-radius: 999px;
  font-weight: 650;
  font-size: 13px;
  letter-spacing: 0.01em;
  cursor: pointer;
  transition: transform 160ms ease, background-color 160ms ease, border-color 160ms ease, color 160ms ease;
}

.strip-button:hover {
  transform: translateY(-1px);
  background: var(--primary-soft);
  border-color: rgba(37, 99, 235, 0.25);
  color: var(--primary);
}

.studio-pathways {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: center;
  padding: 0 4px 4px;
}

.studio-pathways a {
  text-decoration: none;
  color: var(--text-2);
  font-size: 13px;
  padding: 6px 2px;
  border-bottom: 1px solid transparent;
}

.studio-pathways a:hover {
  color: var(--primary);
  border-bottom-color: rgba(37, 99, 235, 0.22);
}

.brain-hint {
  position: absolute;
  left: 14px;
  bottom: 12px;
  z-index: 2;
  font-size: 12px;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.88);
  border: 1px solid var(--line);
  padding: 6px 10px;
  border-radius: 999px;
}

.brain-panel {
  position: fixed;
  top: 18px;
  left: 18px;
  bottom: 18px;
  width: min(420px, calc(100vw - 36px));
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow);
  transform: translateX(calc(-100% - 24px));
  transition: transform 220ms ease;
  z-index: 70;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.brain-panel[data-open="true"] {
  transform: translateX(0);
}

.brain-panel-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 14px 10px;
  border-bottom: 1px solid var(--line);
  background: var(--surface);
}

.brain-panel-title {
  font-size: 13px;
  font-weight: 650;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.brain-panel-body {
  padding: 12px;
  overflow: auto;
  display: grid;
  gap: 12px;
}

.brain-panel-section {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--bg-2);
  padding: 12px;
  display: grid;
  gap: 10px;
}

.brain-panel-section-title {
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
}

.brain-link-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.link-button {
  appearance: none;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink);
  padding: 8px 10px;
  border-radius: 12px;
  font-weight: 600;
  font-size: 13px;
  cursor: pointer;
  text-decoration: none;
  transition: background-color 160ms ease, border-color 160ms ease, color 160ms ease;
}

.link-button:hover {
  background: var(--primary-soft);
  border-color: rgba(37, 99, 235, 0.22);
  color: var(--ink);
}

.link-button--core {
  background: var(--primary-soft);
  border-color: rgba(37, 99, 235, 0.24);
  color: var(--primary);
}

.link-button--muted {
  color: var(--text-2);
}

.brain-canvas {
  position: absolute;
  inset: 0;
  z-index: 1;
}

.brain-canvas svg {
  width: 100%;
  height: 100%;
}

.brain-canvas .brain-hit {
  pointer-events: all;
}

.brain-canvas .brain-halo {
  mix-blend-mode: normal;
}

.brain-canvas .brain-dot {
  transition: r 180ms ease, fill-opacity 180ms ease, stroke-opacity 180ms ease;
}

.brain-canvas .brain-node text {
  transition: opacity 160ms ease;
}

.brain-canvas .brain-link {
  stroke-linecap: round;
  vector-effect: non-scaling-stroke;
}

.brain-canvas .brain-link.is-active {
  stroke-opacity: 1;
}

.tiny {
  font-size: 12px;
  color: var(--muted);
  line-height: 1.6;
}

@media (max-width: 980px) {
  .os-shell {
    grid-template-columns: 1fr;
  }
  .sidebar {
    position: fixed;
    inset: auto 12px 12px 12px;
    height: auto;
    border: 1px solid var(--line);
    border-radius: 999px;
    padding: 8px;
    display: grid;
    grid-template-columns: 1fr;
    background: var(--surface);
    box-shadow: var(--shadow);
    z-index: 50;
  }
  .brand,
  .sidebar-foot {
    display: none;
  }
  .nav {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 6px;
  }
  .nav-button {
    justify-content: center;
    text-align: center;
    padding: 10px 8px;
  }
  .nav-button small {
    display: none;
  }
  .main {
    padding: 16px 14px 92px;
  }
  .brain-panel {
    top: 12px;
    left: 12px;
    right: 12px;
    bottom: 12px;
    width: auto;
  }

  .studio-lobby {
    grid-template-columns: 1fr;
  }

  .lobby-item,
  .lobby-item--now,
  .studio-lobby > .lobby-item:nth-child(2) {
    grid-column: auto;
  }

  .studio-hero {
    grid-template-columns: 1fr;
    min-height: auto;
  }

  .frontdesk {
    justify-content: flex-start;
    padding: 4px 0 0;
  }

  .frontdesk-pulse,
  .frontdesk-guide {
    grid-template-columns: 1fr;
  }

  .brain-stage--split {
    min-height: min(70vh, 640px);
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    scroll-behavior: auto !important;
  }
  .brain-stage::after {
    animation: none;
  }
  .brain-canvas .brain-link.is-active {
    animation: none;
  }
  .brain-canvas .brain-node.is-selected .brain-halo {
    animation: none;
  }
}