:root {
  --paper: #efece4;
  --paper-2: #e7e3d8;
  --ink: #161616;
  --ink-soft: #2b2a26;
  --mute: #6e6a60;
  --rule: #1a1a1a;
  --rule-soft: #c9c4b6;
  --signal: #a8281f;
  --ok: #4a5a3a;
  --warn: #c98a17;
  --serif: "Fraunces", Georgia, serif;
  --sans: "Inter", system-ui, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, monospace;
  --pad-x: 56px;
  --gutter: 28px;
  --section-y: 120px;
  --max: 1280px;
  --source-pill: #e3dccb;
  --source-pill-hover: #d6cdb6;
  --source-composite-bg: #161616;
  --source-composite-fg: #efece4;
  color-scheme: light;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-synthesis: none;
  line-height: 1.5;
  text-rendering: optimizeLegibility;
}

body.theme-dark {
  --paper: #0e0f10;
  --paper-2: #141517;
  --ink: #e9e6dd;
  --ink-soft: #b6b2a6;
  --mute: #7a7770;
  --rule: #2a2d31;
  --rule-soft: #22252a;
  --signal: #c4392f;
  color-scheme: dark;
}

body.density-compact {
  --section-y: 84px;
  --pad-x: 44px;
}

body.density-airy {
  --section-y: 160px;
  --pad-x: 72px;
}

body[data-accent="amber"] {
  --signal: #c98a17;
}

body[data-accent="moss"] {
  --signal: #4a5a3a;
}

body[data-accent="ink"] {
  --signal: var(--ink);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

html,
body,
#app {
  min-height: 100%;
}

html {
  background: var(--paper);
}

@media (prefers-reduced-motion: no-preference) {
  html {
    scroll-behavior: smooth;
  }
}

body {
  min-width: 320px;
  min-height: 100vh;
  overflow-x: hidden;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  -webkit-font-smoothing: antialiased;
}

::selection {
  background: var(--signal);
  color: var(--paper);
}

a {
  color: inherit;
  text-decoration: none;
}

button,
textarea {
  font: inherit;
}

button {
  border: 0;
  cursor: pointer;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.56;
}

.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--pad-x);
}

.topband {
  position: sticky;
  top: 0;
  z-index: 30;
  border-bottom: 1px solid var(--rule);
  background: var(--paper);
}

.topband-inner {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  height: 56px;
  gap: 32px;
}

.brand {
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  font-weight: 800;
  letter-spacing: 0.01em;
  line-height: 1;
  text-transform: uppercase;
}

.brand em {
  margin-left: 0.18em;
  color: var(--mute);
  font-family: var(--serif);
  font-size: 0.92em;
  font-style: italic;
  font-variation-settings: "opsz" 144;
  font-weight: 400;
  letter-spacing: -0.015em;
  text-transform: lowercase;
}

nav.primary {
  display: flex;
  justify-content: center;
  gap: 28px;
  color: var(--ink-soft);
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 500;
}

nav.primary a {
  position: relative;
  padding: 4px 0;
}

nav.primary a:hover {
  color: var(--signal);
}

nav.primary a.live::after {
  content: "";
  position: absolute;
  top: 8px;
  right: -10px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--signal);
  box-shadow: 0 0 0 3px color-mix(in oklab, var(--signal) 18%, transparent);
}

.top-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

/* Mobile nav — hidden on desktop, revealed at <=980px (see media query). */
.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  padding: 0;
  background: transparent;
  border: 1px solid var(--rule);
  color: var(--ink);
  border-radius: 4px;
  cursor: pointer;
}
.nav-toggle svg { width: 18px; height: 18px; }
.nav-toggle:active { transform: scale(0.96); }
.mobile-menu { display: none; }

.top-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--mute);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.top-meta i {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--ok);
  box-shadow: 0 0 0 3px color-mix(in oklab, var(--ok) 22%, transparent);
}

.btn {
  display: inline-flex;
  min-height: 0;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--rule);
  border-radius: 2px;
  background: transparent;
  color: var(--ink);
  padding: 8px 14px;
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 500;
  transition:
    background 0.15s,
    border-color 0.15s,
    color 0.15s;
  white-space: nowrap;
}

.btn:hover:not(:disabled) {
  background: var(--ink);
  color: var(--paper);
}

.btn.primary {
  border-color: var(--ink);
  background: var(--ink);
  color: var(--paper);
}

.btn.primary:hover:not(:disabled) {
  border-color: var(--signal);
  background: var(--signal);
  color: var(--paper);
}

.btn .arrow,
.arrow {
  font-family: var(--mono);
  font-size: 14px;
  line-height: 1;
}

.section {
  position: relative;
  border-bottom: 1px solid var(--rule);
  padding: var(--section-y) 0;
}

.section:last-of-type {
  border-bottom: 0;
}

.section-mark {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 14px;
  margin-bottom: 56px;
  color: var(--mute);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.28em;
  text-transform: uppercase;
}

.section-mark .num {
  color: var(--signal);
  font-weight: 500;
}

.section-mark .line {
  height: 1px;
  background: var(--rule-soft);
}

.hero {
  position: relative;
  border-bottom: 1px solid var(--rule);
  padding-top: 88px;
  padding-bottom: var(--section-y);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
}

.hero-eyebrow {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 36px;
  color: var(--mute);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.32em;
  text-transform: uppercase;
}

.hero-eyebrow .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--signal);
  box-shadow: 0 0 0 4px color-mix(in oklab, var(--signal) 18%, transparent);
}

.hero-eyebrow .sep {
  flex: 1;
  max-width: 64px;
  height: 1px;
  background: var(--rule-soft);
}

.headline {
  margin: 0;
  color: var(--ink);
  font-family: var(--serif);
  font-size: clamp(56px, 9vw, 156px);
  font-variation-settings: "opsz" 144;
  font-weight: 400;
  letter-spacing: -0.035em;
  line-height: 0.92;
  text-wrap: pretty;
}

.headline em {
  color: var(--mute);
  font-style: italic;
}

.hero-sub {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  align-items: end;
  gap: 64px;
  margin-top: 40px;
}

.hero-sub p {
  max-width: 42ch;
  margin: 0;
  color: var(--ink-soft);
  font-family: var(--serif);
  font-size: 22px;
  font-variation-settings: "opsz" 60;
  font-weight: 400;
  letter-spacing: -0.005em;
  line-height: 1.45;
}

.hero-sub p em {
  color: var(--signal);
  font-style: italic;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}

.meta-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  margin-top: 88px;
  border-top: 1.5px solid var(--rule);
  padding-top: 18px;
}

.meta-grid .cell {
  border-right: 1px solid var(--rule-soft);
  padding-right: 24px;
}

.meta-grid .cell:last-child {
  border-right: 0;
}

.meta-grid .k,
.preview-text .meta .k,
.chat-meta .k {
  margin-bottom: 8px;
  color: var(--mute);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
}

.meta-grid .v,
.preview-text .meta .v,
.chat-meta .v {
  color: var(--ink);
  font-family: var(--sans);
  font-size: 14px;
  font-weight: 500;
}

.chat-row {
  display: grid;
  grid-template-columns: minmax(260px, 0.78fr) minmax(0, 1.35fr);
  align-items: start;
  gap: 80px;
}

.chat-intro h2,
.manifesto h2 {
  margin: 0;
  color: var(--ink);
  font-family: var(--serif);
  font-size: clamp(36px, 5vw, 72px);
  font-variation-settings: "opsz" 144;
  font-weight: 400;
  letter-spacing: -0.025em;
  line-height: 0.95;
}

.chat-intro h2 em,
.manifesto h2 em {
  color: var(--mute);
  font-style: italic;
}

.chat-intro p {
  max-width: 42ch;
  margin: 24px 0 0;
  color: var(--ink-soft);
  font-family: var(--serif);
  font-size: 19px;
  font-variation-settings: "opsz" 60;
  line-height: 1.5;
}

.chat-meta {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-top: 28px;
  border-top: 1px solid var(--rule-soft);
  padding-top: 14px;
}

.research-chat {
  display: grid;
  grid-template-rows: auto minmax(360px, 54vh) auto;
  overflow: hidden;
  border: 1px solid var(--rule);
  background: var(--paper-2);
  box-shadow: 0 24px 60px -36px rgba(0, 0, 0, 0.25);
}

.research-chat-top {
  display: flex;
  justify-content: space-between;
  border-bottom: 1px solid var(--rule-soft);
  padding: 12px 22px;
  color: var(--mute);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.transcript {
  min-height: 0;
  overflow-y: auto;
  padding: 22px;
  scroll-behavior: smooth;
}

.empty-state {
  display: grid;
  min-height: 100%;
  align-content: center;
  gap: 12px;
}

.empty-state .label {
  color: var(--mute);
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.28em;
  text-transform: uppercase;
}

.empty-state h2 {
  margin: 0;
  color: var(--ink);
  font-family: var(--serif);
  font-size: clamp(32px, 4vw, 58px);
  font-variation-settings: "opsz" 144;
  font-weight: 400;
  letter-spacing: -0.025em;
  line-height: 0.95;
}

.empty-state h2 em {
  color: var(--signal);
  font-style: italic;
}

.empty-state p {
  max-width: 34ch;
  margin: 0;
  color: var(--ink-soft);
  font-family: var(--serif);
  font-size: 17px;
  font-variation-settings: "opsz" 60;
  line-height: 1.5;
}

.message {
  display: flex;
  flex-direction: column;
  margin: 0 0 16px;
}

.message:last-child {
  margin-bottom: 0;
}

.message-user {
  align-items: flex-end;
}

.message-assistant,
.message-error {
  align-items: flex-start;
}

.message-bubble {
  width: fit-content;
  max-width: min(720px, 86%);
  border: 1px solid var(--rule-soft);
  border-radius: 2px;
  background: var(--paper);
  color: var(--ink);
  padding: 12px 14px;
  overflow-wrap: anywhere;
  white-space: pre-wrap;
}

.message-user .message-bubble {
  border-color: var(--ink);
  background: var(--ink);
  color: var(--paper);
}

.message-assistant .message-bubble {
  white-space: normal;
}

.message-error .message-bubble {
  border-color: var(--signal);
  background: color-mix(in oklab, var(--signal) 12%, var(--paper));
  color: var(--ink);
}

.message-bubble-pending {
  color: var(--mute);
}

.message-markdown {
  display: grid;
  gap: 10px;
  min-width: 0;
  max-width: 100%;
}

.message-markdown p,
.message-markdown ul,
.message-markdown ol,
.message-markdown figure,
.message-markdown h2,
.message-markdown h3,
.message-markdown h4 {
  margin: 0;
}

.message-markdown h2,
.message-markdown h3,
.message-markdown h4 {
  color: var(--ink);
  font-family: var(--serif);
  font-size: 1.08rem;
  font-weight: 500;
  line-height: 1.25;
}

.message-markdown ul,
.message-markdown ol {
  padding-left: 1.25rem;
}

.message-markdown li + li {
  margin-top: 4px;
}

.message-markdown hr {
  width: 100%;
  height: 1px;
  border: 0;
  background: var(--rule-soft);
}

.message-markdown code {
  border: 1px solid var(--rule-soft);
  border-radius: 2px;
  background: var(--paper-2);
  padding: 1px 5px;
  color: var(--ink);
  font-family: var(--mono);
  font-size: 0.92em;
}

.message-markdown a {
  color: var(--signal);
}

.message-markdown table {
  display: block;
  max-width: 100%;
  overflow-x: auto;
  border-collapse: collapse;
  font-size: 0.92em;
}

.message-markdown th,
.message-markdown td {
  border: 1px solid var(--rule-soft);
  padding: 6px 9px;
  text-align: left;
  vertical-align: top;
  overflow-wrap: anywhere;
}

.code-block {
  width: min(680px, 100%);
  overflow: hidden;
  border: 1px solid var(--rule);
  border-radius: 2px;
  background: var(--paper);
}

.code-block-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  border-bottom: 1px solid var(--rule-soft);
  background: var(--paper-2);
  padding: 7px 9px;
  color: var(--mute);
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.code-copy-button {
  min-height: 28px;
  border: 1px solid var(--rule);
  border-radius: 2px;
  background: transparent;
  color: var(--ink);
  padding: 0 9px;
  cursor: pointer;
}

.code-copy-button:hover {
  background: var(--ink);
  color: var(--paper);
}

.code-block pre {
  margin: 0;
  max-width: 100%;
  overflow-x: auto;
  padding: 12px;
}

.code-block pre code {
  display: block;
  border: 0;
  border-radius: 0;
  background: transparent;
  padding: 0;
  white-space: pre;
  font-size: 0.86rem;
  line-height: 1.55;
}

.composer {
  display: grid;
  gap: 10px;
  border-top: 1px solid var(--rule-soft);
  background: var(--paper);
  padding: 14px;
}

.composer-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto auto;
  align-items: end;
  gap: 10px;
}

.composer textarea {
  width: 100%;
  max-height: 9.5rem;
  min-height: 44px;
  resize: none;
  border: 1px solid var(--rule);
  border-radius: 2px;
  outline: none;
  background: var(--paper-2);
  color: var(--ink);
  padding: 10px 12px;
  overflow-y: auto;
}

.composer textarea:focus {
  border-color: var(--signal);
  box-shadow: 0 0 0 3px color-mix(in oklab, var(--signal) 18%, transparent);
}

.composer textarea:disabled {
  opacity: 0.72;
}

.context-meter {
  display: grid;
  gap: 6px;
}

.context-meter-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  color: var(--mute);
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.context-meter-track {
  height: 6px;
  overflow: hidden;
  border-radius: 999px;
  background: color-mix(in oklab, var(--rule-soft) 75%, transparent);
}

.context-meter-fill {
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: var(--ok);
  transition:
    width 120ms ease,
    background-color 120ms ease;
}

.context-meter-fill.is-warm {
  background: var(--warn);
}

.context-meter-fill.is-hot {
  background: var(--signal);
}

.manifesto {
  display: grid;
  grid-template-columns: 1fr 2fr;
  align-items: start;
  gap: 80px;
}

.principles {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: p;
}

.principles li {
  display: grid;
  grid-template-columns: 56px 1fr;
  align-items: baseline;
  gap: 24px;
  border-top: 1px solid var(--rule-soft);
  padding: 22px 0;
  counter-increment: p;
}

.principles li:last-child {
  border-bottom: 1px solid var(--rule-soft);
}

.principles li::before {
  content: counter(p, decimal-leading-zero);
  color: var(--signal);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.18em;
}

.principles .lede {
  margin-bottom: 8px;
  color: var(--ink);
  font-family: var(--serif);
  font-size: 26px;
  font-variation-settings: "opsz" 96;
  font-weight: 400;
  letter-spacing: -0.015em;
  line-height: 1.25;
}

.principles .body {
  max-width: 62ch;
  color: var(--ink-soft);
  font-size: 14px;
  line-height: 1.55;
}

.passes-head {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: end;
  gap: 80px;
  margin-bottom: 72px;
}

.passes-head h2 {
  margin: 0;
  color: var(--ink);
  font-family: var(--serif);
  font-size: clamp(48px, 6vw, 96px);
  font-variation-settings: "opsz" 144;
  font-weight: 400;
  letter-spacing: -0.03em;
  line-height: 0.95;
}

.passes-head h2 em {
  color: var(--mute);
  font-style: italic;
}

.passes-head .desc {
  max-width: 52ch;
  margin: 0;
  color: var(--ink-soft);
  font-family: var(--serif);
  font-size: 19px;
  font-variation-settings: "opsz" 60;
  line-height: 1.5;
}

.passes-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  align-items: stretch;
  gap: 24px;
}

.pass-card {
  position: relative;
  display: flex;
  flex-direction: column;
  border: 1.5px solid var(--rule);
  background: var(--paper-2);
  padding: 32px 28px 30px;
}

.pass-card.featured {
  border-color: var(--signal);
  box-shadow: inset 0 0 0 1px color-mix(in oklab, var(--signal) 35%, transparent);
}

.pass-card .top {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
  margin-bottom: 28px;
  border-bottom: 1px solid var(--rule);
  padding-bottom: 14px;
  color: var(--mute);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
}

.pass-card .top .id {
  color: var(--signal);
}

.pass-card .price {
  display: flex;
  align-items: flex-start;
  gap: 6px;
  color: var(--ink);
  font-family: var(--sans);
  font-size: clamp(58px, 6vw, 82px);
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 0.9;
}

.pass-card .price.compact {
  font-size: clamp(52px, 5vw, 72px);
}

.pass-card .price .cur {
  margin-top: 6px;
  color: var(--mute);
  font-size: 28px;
  font-weight: 500;
}

.pass-card .price .per {
  align-self: flex-end;
  margin-bottom: 10px;
  margin-left: 8px;
  color: var(--mute);
  font-family: var(--serif);
  font-size: 24px;
  font-style: italic;
  font-variation-settings: "opsz" 96;
  font-weight: 400;
}

.pass-card .lede {
  max-width: 36ch;
  margin-top: 18px;
  color: var(--ink);
  font-family: var(--serif);
  font-size: 19px;
  font-variation-settings: "opsz" 60;
  line-height: 1.4;
}

.pass-card .allowance {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  margin-top: 28px;
  border-top: 1px solid var(--rule);
}

.pass-card .allowance .a {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 18px;
  border-bottom: 1px solid var(--rule-soft);
  padding: 12px 0;
}

.pass-card .allowance .a:last-child {
  border-bottom: 0;
}

.pass-card .allowance .ak {
  color: var(--mute);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

.pass-card .allowance .av {
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  letter-spacing: -0.01em;
  overflow-wrap: anywhere;
  text-align: right;
}

.pass-card .allowance .av small {
  margin-left: 3px;
  color: var(--mute);
  font-family: var(--serif);
  font-size: 13px;
  font-style: italic;
  font-weight: 400;
}

.pass-card .actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-top: auto;
  padding-top: 32px;
}

.pass-guide {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 24px;
  margin-top: 22px;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule-soft);
  padding: 18px 0;
}

.pass-guide .eyebrow {
  color: var(--mute);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

.pass-guide ul {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.pass-guide li {
  color: var(--ink-soft);
  font-size: 13.5px;
  line-height: 1.55;
}

.pass-explain {
  display: flex;
  flex-direction: column;
}

.pass-explain .ttl {
  margin: 0 0 18px;
  color: var(--ink);
  font-family: var(--serif);
  font-size: 28px;
  font-variation-settings: "opsz" 144;
  font-weight: 400;
  letter-spacing: -0.015em;
  line-height: 1.15;
}

.pass-explain .ttl em {
  color: var(--mute);
  font-style: italic;
}

.pass-explain p {
  max-width: 40ch;
  margin: 0 0 16px;
  color: var(--ink-soft);
  font-size: 14.5px;
  line-height: 1.6;
}

.stack-diag {
  margin-top: 22px;
  border: 1px solid var(--rule-soft);
  background: var(--paper);
  padding: 18px;
}

.stack-diag .axis {
  display: flex;
  justify-content: space-between;
  margin-bottom: 10px;
  color: var(--mute);
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

.stack-diag .track {
  position: relative;
  height: 80px;
  border-top: 1px solid var(--rule-soft);
  border-bottom: 1px solid var(--rule-soft);
  background: repeating-linear-gradient(
    to right,
    transparent 0,
    transparent calc(10% - 1px),
    var(--rule-soft) calc(10% - 1px),
    var(--rule-soft) 10%
  );
}

.stack-diag .bar {
  position: absolute;
  display: flex;
  align-items: center;
  height: 14px;
  border-radius: 1px;
  padding: 0 6px;
  overflow: hidden;
  color: var(--paper);
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.06em;
  white-space: nowrap;
}

.stack-diag .bar.b1 {
  top: 6px;
  background: var(--signal);
}

.stack-diag .bar.b2 {
  top: 24px;
  background: var(--ink);
}

.stack-diag .bar.b3 {
  top: 42px;
  background: var(--mute);
}

.stack-diag .now {
  position: absolute;
  top: -6px;
  bottom: -6px;
  width: 1px;
  background: var(--ink);
}

.stack-diag .now::after {
  content: "now";
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--paper);
  color: var(--ink);
  padding: 0 4px;
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.stack-diag .caption {
  margin-top: 10px;
  color: var(--mute);
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.index-head {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: end;
  gap: 32px;
  margin-bottom: 56px;
}

.index-head h2 {
  margin: 0;
  color: var(--ink);
  font-family: var(--serif);
  font-size: clamp(40px, 5vw, 72px);
  font-variation-settings: "opsz" 144;
  font-weight: 400;
  letter-spacing: -0.025em;
  line-height: 0.95;
}

.index-head h2 em {
  color: var(--mute);
  font-style: italic;
}

.index-head .lede {
  color: var(--mute);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.index-empty {
  margin: 24px 0 0;
  padding: 32px 0;
  border-top: 1px solid var(--rule-soft);
  border-bottom: 1px solid var(--rule-soft);
  text-align: center;
}
.index-empty-title {
  margin: 0 0 6px;
  color: var(--ink);
  font-family: var(--serif);
  font-size: 18px;
  font-style: italic;
  font-weight: 400;
}
.index-empty-sub {
  margin: 0;
  color: var(--mute);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

/* Trademark mark next to the brand. Kept at the inherited size; only
   needs a generous left margin to clear italic-Fraunces 'h' tail. */
.tm {
  margin-left: 0.15em;
}

.index-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.index-list li {
  border-top: 1px solid var(--rule-soft);
  cursor: pointer;
  transition:
    background 0.15s;
}

.index-list li > a {
  display: grid;
  grid-template-columns: 80px 1fr 1.4fr 120px 110px;
  align-items: baseline;
  gap: 24px;
  padding: 22px 0;
  transition:
    padding 0.15s;
}

.index-list li:last-child {
  border-bottom: 1px solid var(--rule-soft);
}

.index-list li:hover {
  background: color-mix(in oklab, var(--signal) 4%, transparent);
}

.index-list li:hover > a {
  padding-right: 12px;
  padding-left: 12px;
}

.index-list .nm {
  color: var(--signal);
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.index-list .ttl {
  color: var(--ink);
  font-family: var(--serif);
  font-size: 22px;
  font-variation-settings: "opsz" 96;
  font-weight: 400;
  letter-spacing: -0.01em;
  line-height: 1.2;
}

.index-list .desc {
  color: var(--ink-soft);
  font-family: var(--serif);
  font-size: 15px;
  font-variation-settings: "opsz" 60;
  line-height: 1.45;
}

.index-list .author {
  color: var(--mute);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.index-list .author b {
  display: block;
  margin-bottom: 2px;
  color: var(--ink);
  font-family: var(--sans);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0;
  text-transform: none;
}

.index-list .when {
  color: var(--mute);
  font-family: var(--mono);
  font-size: 11px;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.06em;
  text-align: right;
}

.index-list .when b {
  display: block;
  color: var(--ink);
  font-size: 12px;
  font-weight: 500;
}

.index-list .when.live,
.index-list .when.live b {
  color: var(--signal);
}

.blog-section {
  overflow: visible;
}

.blog-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(260px, 320px);
  align-items: start;
  gap: 56px;
}

.blog-reader {
  min-width: 0;
}

.blog-rail {
  position: sticky;
  top: 92px;
  border: 1px solid var(--rule);
  background: var(--paper-2);
  padding: 22px;
}

.blog-rail h3 {
  margin: 0 0 18px;
  color: var(--mute);
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.24em;
  text-transform: uppercase;
}

.blog-rail ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

.blog-rail li {
  border-top: 1px solid var(--rule-soft);
}

.blog-rail li:last-child {
  border-bottom: 1px solid var(--rule-soft);
}

.blog-rail a {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 6px 14px;
  padding: 16px 0;
}

.blog-rail a:hover {
  color: var(--signal);
}

.blog-rail .nm {
  grid-row: span 2;
  color: var(--signal);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.16em;
}

.blog-rail .ttl {
  color: var(--ink);
  font-family: var(--serif);
  font-size: 19px;
  font-variation-settings: "opsz" 96;
  line-height: 1.18;
}

.blog-rail .meta {
  color: var(--mute);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.blog-article {
  max-width: 980px;
  border-top: 1.5px solid var(--rule);
  padding-top: 58px;
  scroll-margin-top: 88px;
}

.blog-article + .blog-article {
  margin-top: 92px;
}

.blog-article-head {
  margin-bottom: 42px;
}

.blog-article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  margin-bottom: 18px;
  color: var(--signal);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

.blog-article h1 {
  max-width: 10ch;
  margin: 0;
  color: var(--ink);
  font-family: var(--serif);
  font-size: clamp(52px, 7vw, 94px);
  font-variation-settings: "opsz" 144;
  font-weight: 400;
  letter-spacing: -0.03em;
  line-height: 0.92;
}

.blog-article-desc {
  max-width: 62ch;
  margin: 24px 0 0;
  color: var(--ink-soft);
  font-family: var(--serif);
  font-size: 21px;
  font-variation-settings: "opsz" 60;
  line-height: 1.5;
}

.blog-article-section {
  display: grid;
  grid-template-columns: minmax(180px, 260px) minmax(0, 1fr);
  gap: 16px 44px;
  border-top: 1px solid var(--rule-soft);
  padding: 32px 0;
}

.blog-article-section h2 {
  margin: 0;
  color: var(--ink);
  font-family: var(--serif);
  font-size: 25px;
  font-variation-settings: "opsz" 96;
  font-weight: 400;
  letter-spacing: -0.01em;
  line-height: 1.18;
}

.blog-article-section p {
  grid-column: 2;
  max-width: 70ch;
  margin: 0;
  color: var(--ink-soft);
  font-size: 16px;
  line-height: 1.75;
}

.endcard {
  border-top: 1.5px solid var(--rule);
  padding: var(--section-y) var(--pad-x);
}

.endcard h2 {
  margin: 0;
  color: var(--ink);
  font-family: var(--serif);
  font-size: clamp(72px, 12vw, 196px);
  font-variation-settings: "opsz" 144;
  font-weight: 400;
  letter-spacing: -0.045em;
  line-height: 0.85;
  text-wrap: balance;
}

.endcard h2 em {
  color: var(--signal);
  font-style: italic;
}

.endcard .endrow {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: end;
  gap: 64px;
  margin-top: 56px;
  border-top: 1.5px solid var(--rule);
  padding-top: 28px;
}

.endcard .endrow p {
  max-width: 44ch;
  margin: 0;
  color: var(--ink-soft);
  font-family: var(--serif);
  font-size: 19px;
  font-variation-settings: "opsz" 60;
  line-height: 1.5;
}

.endcard .endrow .actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 12px;
}

footer.foot {
  background: var(--ink);
  color: var(--paper);
  padding: 56px 0 0;
}

footer.foot .row {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap: 40px;
  border-bottom: 1px solid color-mix(in oklab, var(--paper) 15%, transparent);
  padding-bottom: 56px;
}

footer.foot .col h4 {
  margin: 0 0 18px;
  color: color-mix(in oklab, var(--paper) 55%, transparent);
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.28em;
  text-transform: uppercase;
}

footer.foot .col ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

footer.foot .col ul li {
  padding: 6px 0;
  color: var(--paper);
  font-family: var(--sans);
  font-size: 14px;
}

footer.foot .brand-col .mark {
  color: var(--paper);
  font-family: var(--sans);
  font-size: 22px;
  font-weight: 800;
  letter-spacing: 0.01em;
  line-height: 1;
  text-transform: uppercase;
}

footer.foot .brand-col .mark em {
  margin-left: 0.18em;
  color: color-mix(in oklab, var(--paper) 55%, transparent);
  font-family: var(--serif);
  font-style: italic;
  font-variation-settings: "opsz" 144;
  font-weight: 400;
  text-transform: lowercase;
}

footer.foot .brand-col p {
  max-width: 36ch;
  margin: 14px 0 0;
  color: color-mix(in oklab, var(--paper) 75%, transparent);
  font-family: var(--serif);
  font-size: 16px;
  font-variation-settings: "opsz" 60;
  line-height: 1.45;
}

footer.foot .legal {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 22px 0;
  color: color-mix(in oklab, var(--paper) 50%, transparent);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
}

.toast {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 40;
  margin: 0;
  border: 1px solid var(--rule);
  border-radius: 2px;
  background: var(--paper-2);
  color: var(--ink);
  padding: 11px 13px;
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.28);
}

@media (max-width: 980px) {
  :root {
    --pad-x: 28px;
    --section-y: 80px;
  }

  .topband-inner {
    grid-template-columns: auto auto;
    /* Tighter than the 32px desktop gap so brand + hamburger + CTA fit on
       a phone row without horizontal overflow. */
    gap: 14px;
  }

  nav.primary,
  .top-meta {
    display: none;
  }

  /* Reveal the hamburger and let the collapsible menu drop below the bar
     when opened. Above this width both stay display:none from the base
     rules, so resizing to desktop auto-hides an open menu. */
  .nav-toggle {
    display: inline-flex;
  }
  .topband.nav-open .mobile-menu {
    display: flex;
    flex-direction: column;
  }
  .mobile-menu {
    padding: 6px var(--pad-x) 14px;
    background: var(--paper);
    border-top: 1px solid var(--rule-soft);
  }
  .mobile-menu a {
    padding: 13px 2px;
    color: var(--ink);
    text-decoration: none;
    font-family: var(--sans);
    font-size: 15px;
    font-weight: 500;
    border-bottom: 1px solid var(--rule-soft);
  }
  .mobile-menu a:last-child {
    border-bottom: 0;
  }
  .mobile-menu a:active {
    color: var(--signal);
  }

  .hero-sub,
  .chat-row,
  .manifesto,
  .passes-row,
  .pass-guide,
  .passes-head,
  .endcard .endrow {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .pass-guide ul {
    grid-template-columns: 1fr;
  }

  .meta-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 18px 0;
  }

  .meta-grid .cell {
    border-right: 0;
    border-bottom: 1px solid var(--rule-soft);
    padding-right: 0;
    padding-bottom: 14px;
  }

  .index-list li > a {
    grid-template-columns: 60px 1fr;
    gap: 12px 16px;
  }

  .index-list .desc,
  .index-list .author,
  .index-list .when {
    grid-column: 2;
  }

  .index-list .when {
    text-align: left;
  }

  .blog-layout {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .blog-reader {
    order: 2;
  }

  .blog-rail {
    position: static;
    order: 1;
  }

  .blog-article {
    max-width: none;
  }

  .blog-article-section {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .blog-article-section p {
    grid-column: 1;
  }

  footer.foot .row {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 680px) {
  :root {
    --pad-x: 18px;
  }

  .topband-inner {
    height: auto;
    min-height: 56px;
    padding-top: 10px;
    padding-bottom: 10px;
    gap: 10px;
  }

  .top-actions {
    gap: 8px;
  }

  .top-actions .btn:not(.primary) {
    display: none;
  }

  /* Slimmer CTA + slightly smaller brand so brand + hamburger + "Get
     access" clear the row even on ~360px phones. */
  .top-actions .btn.primary {
    padding: 8px 11px;
  }

  .topband .brand {
    font-size: 15px;
  }

  .headline {
    font-size: clamp(48px, 18vw, 96px);
  }

  .meta-grid,
  .chat-meta,
  .pass-card .allowance,
  footer.foot .row {
    grid-template-columns: 1fr;
  }

  .research-chat {
    grid-template-rows: auto minmax(320px, 54vh) auto;
  }

  .composer-row {
    grid-template-columns: 1fr;
  }

  .message-bubble {
    max-width: 94%;
  }

  .pass-card {
    padding: 28px 24px;
  }

  .pass-card .price {
    font-size: 64px;
  }

  .endcard {
    padding-right: var(--pad-x);
    padding-left: var(--pad-x);
  }

  .endcard .endrow .actions {
    justify-content: flex-start;
  }
}

/* ============ Citations ============ */

.turn.ai .text .source-ref {
  display: inline-block;
  padding: 0 6px;
  margin: 0 1px;
  border-radius: 4px;
  background: var(--source-pill);
  color: var(--ink);
  text-decoration: none;
  font-size: 0.78em;
  font-weight: 500;
  line-height: 1.4;
  border: 1px solid transparent;
  transition: background-color 0.12s ease, border-color 0.12s ease;
}

.turn.ai .text .source-ref:hover,
.turn.ai .text .source-ref:focus {
  background: var(--source-pill-hover);
  border-color: var(--rule-soft);
  text-decoration: none;
  outline: none;
}

.turn.ai .text .source-ref-composite {
  cursor: pointer;
  background: var(--source-composite-bg);
  color: var(--source-composite-fg);
}

.turn.ai .text .source-ref-composite:hover,
.turn.ai .text .source-ref-composite:focus {
  background: #2a2a2a;
}

.turn.ai .text .source-popover {
  position: absolute;
  z-index: 50;
  min-width: 220px;
  max-width: 320px;
  background: var(--ink);
  color: var(--paper);
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 8px 0;
  box-shadow: 0 4px 18px rgba(0, 0, 0, 0.18);
  font-size: 0.85em;
  font-family: var(--sans);
}

.turn.ai .text .source-popover-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.turn.ai .text .source-popover-list li {
  display: flex;
  gap: 6px;
  padding: 4px 12px;
}

.turn.ai .text .source-popover-list .source-id {
  font-family: var(--mono);
  font-size: 0.85em;
  color: var(--rule-soft);
  flex-shrink: 0;
}

.turn.ai .text .source-popover-list a {
  color: var(--paper);
  text-decoration: none;
  border-bottom: 1px dotted var(--rule-soft);
  word-break: break-word;
}

.turn.ai .text .source-popover-list a:hover {
  border-bottom-style: solid;
}

.turn.ai .text .sources-panel {
  margin-top: 18px;
  padding: 10px 14px 12px;
  border: 1px solid var(--rule-soft);
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.45);
  font-family: var(--sans);
}

.turn.ai .text .sources-panel summary {
  cursor: pointer;
  font-weight: 600;
  font-size: 0.85em;
  color: var(--ink-soft);
  letter-spacing: 0.02em;
  list-style: none;
}

.turn.ai .text .sources-panel summary::-webkit-details-marker {
  display: none;
}

.turn.ai .text .sources-panel summary::before {
  content: "▸ ";
  display: inline-block;
  transition: transform 0.12s ease;
  margin-right: 4px;
}

.turn.ai .text .sources-panel[open] summary::before {
  content: "▾ ";
}

.turn.ai .text .sources-list {
  margin: 10px 0 0;
  padding: 0;
  list-style: none;
  counter-reset: source-counter;
  display: grid;
  gap: 6px;
}

.turn.ai .text .sources-list li {
  counter-increment: source-counter;
  display: flex;
  align-items: baseline;
  gap: 8px;
  font-size: 0.85em;
  line-height: 1.45;
}

.turn.ai .text .sources-list li::before {
  content: "[" counter(source-counter) "]";
  font-family: var(--mono);
  font-size: 0.8em;
  color: var(--mute);
  flex-shrink: 0;
  min-width: 28px;
  text-align: right;
}

.turn.ai .text .sources-list .source-id {
  display: none;
}

.turn.ai .text .sources-list a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--rule-soft);
  word-break: break-word;
}

.turn.ai .text .sources-list a:hover {
  border-bottom-color: var(--ink);
}