:root {
  --ink: #17211d;
  --ink-soft: #53605a;
  --paper: #f7f4ec;
  --paper-deep: #ebe6da;
  --white: #fffdf8;
  --forest: #19352d;
  --forest-2: #102821;
  --lime: #c7f36b;
  --lime-soft: #e7f7bf;
  --orange: #f17849;
  --blue: #9fc9ff;
  --line: rgba(23, 33, 29, 0.14);
  --shadow: 0 24px 70px rgba(19, 38, 31, 0.12);
  --radius: 24px;
  --radius-sm: 16px;
  --max: 1200px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  overflow-x: hidden;
  color: var(--ink);
  background:
    radial-gradient(circle at 8% 2%, rgba(199, 243, 107, 0.2), transparent 28rem),
    var(--paper);
  font-family: "DM Sans", system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.62;
  -webkit-font-smoothing: antialiased;
}

button,
textarea {
  font: inherit;
}

a {
  color: inherit;
}

.page-shell {
  min-height: 100vh;
  overflow: hidden;
}

.site-header {
  width: min(calc(100% - 40px), var(--max));
  height: 78px;
  margin: 18px auto 0;
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border: 1px solid rgba(23, 33, 29, 0.12);
  border-radius: 20px;
  background: rgba(255, 253, 248, 0.78);
  backdrop-filter: blur(18px);
  position: relative;
  z-index: 10;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  font-family: "Manrope", sans-serif;
  font-weight: 800;
  letter-spacing: -0.03em;
}

.brand-mark {
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  border-radius: 10px;
  color: var(--forest);
  background: var(--lime);
  font-size: 12px;
  letter-spacing: -0.04em;
}

.desktop-nav {
  display: flex;
  align-items: center;
  gap: 26px;
}

.desktop-nav a,
.header-meta {
  color: var(--ink-soft);
  font-size: 13px;
  font-weight: 600;
  text-decoration: none;
}

.desktop-nav a {
  transition: color 160ms ease;
}

.desktop-nav a:hover {
  color: var(--ink);
}

.header-meta {
  display: flex;
  align-items: center;
  gap: 8px;
}

.live-dot {
  width: 8px;
  height: 8px;
  border-radius: 999px;
  background: #4caf68;
  box-shadow: 0 0 0 5px rgba(76, 175, 104, 0.12);
}

.hero {
  width: min(calc(100% - 40px), var(--max));
  margin: 72px auto 54px;
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(350px, 0.65fr);
  gap: 72px;
  align-items: center;
}

.hero-copy,
.hero-card {
  min-width: 0;
}

.eyebrow,
.card-kicker,
.mini-label,
.panel-label {
  color: var(--orange);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.hero h1,
.section-heading h2,
.notebook-copy h2 {
  margin: 18px 0 22px;
  font-family: "Manrope", sans-serif;
  font-weight: 800;
  letter-spacing: -0.055em;
  line-height: 0.98;
}

.hero h1 {
  max-width: 760px;
  font-size: clamp(54px, 7vw, 92px);
  overflow-wrap: anywhere;
}

.hero h1 span {
  color: var(--forest);
  position: relative;
  z-index: 1;
}

.hero h1 span::after {
  content: "";
  height: 0.17em;
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0.04em;
  border-radius: 999px;
  background: var(--lime);
  z-index: -1;
}

.hero-lede {
  max-width: 720px;
  margin: 0;
  color: var(--ink-soft);
  font-size: 20px;
}

.hero-actions {
  margin-top: 34px;
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.button {
  min-height: 48px;
  padding: 0 20px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid transparent;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
  transition: transform 160ms ease, background 160ms ease, border-color 160ms ease;
}

.button:hover {
  transform: translateY(-2px);
}

.button-primary {
  color: var(--white);
  background: var(--forest);
}

.button-primary:hover {
  background: var(--forest-2);
}

.button-ghost {
  color: var(--ink);
  border-color: var(--line);
  background: rgba(255, 255, 255, 0.28);
}

.button-ghost:hover {
  border-color: rgba(23, 33, 29, 0.3);
}

.button-light {
  color: var(--forest);
  background: var(--lime);
}

.button.compact {
  min-height: 38px;
  padding: 0 14px;
  font-size: 12px;
}

.hero-footnote {
  margin-top: 24px;
  color: #7d867f;
  font-size: 12px;
}

.hero-card {
  padding: 28px;
  border-radius: 30px;
  color: var(--white);
  background:
    radial-gradient(circle at 100% 0%, rgba(199, 243, 107, 0.18), transparent 15rem),
    var(--forest);
  box-shadow: var(--shadow);
  transform: rotate(1.2deg);
}

.hero-card .card-kicker {
  color: var(--lime);
}

.formula {
  margin-top: 25px;
  display: grid;
  gap: 12px;
}

.formula > div {
  padding: 16px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.05);
}

.formula strong {
  font-family: "Manrope", sans-serif;
  font-size: 15px;
}

.formula span {
  color: rgba(255, 255, 255, 0.62);
  font-size: 12px;
}

.formula i {
  color: var(--lime);
  font-family: "Manrope", sans-serif;
  font-size: 20px;
  font-style: normal;
  line-height: 1;
  text-align: center;
}

.formula-note {
  margin: 20px 0 0;
  color: rgba(255, 255, 255, 0.53);
  font-size: 11px;
}

.signal-strip {
  width: min(calc(100% - 40px), var(--max));
  margin: 0 auto 110px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 253, 248, 0.7);
  overflow: hidden;
}

.signal-strip article {
  min-height: 185px;
  padding: 26px;
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--line);
}

.signal-strip article:last-child {
  border-right: 0;
}

.signal-value {
  font-family: "Manrope", sans-serif;
  font-size: 42px;
  font-weight: 800;
  letter-spacing: -0.06em;
}

.signal-label {
  max-width: 190px;
  margin-top: 6px;
  color: var(--ink-soft);
  font-size: 13px;
  line-height: 1.45;
}

.signal-strip a {
  margin-top: auto;
  color: var(--forest);
  font-size: 11px;
  font-weight: 700;
  text-decoration: none;
}

.section {
  width: min(calc(100% - 40px), var(--max));
  margin: 0 auto;
  padding: 104px 0;
  scroll-margin-top: 24px;
}

.section-heading {
  margin-bottom: 54px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 0.46fr);
  gap: 68px;
  align-items: end;
}

.section-heading h2,
.notebook-copy h2 {
  max-width: 760px;
  margin-bottom: 0;
  font-size: clamp(40px, 5.2vw, 68px);
}

.section-heading > p {
  margin: 0;
  color: var(--ink-soft);
}

.thesis-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 16px;
}

.thesis-card {
  min-height: 290px;
  padding: 26px;
  grid-column: span 2;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 253, 248, 0.72);
}

.thesis-card:nth-child(4),
.thesis-card:nth-child(5) {
  grid-column: span 3;
}

.thesis-card.accent {
  background: var(--lime-soft);
}

.step-number {
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  border-radius: 999px;
  color: var(--white);
  background: var(--forest);
  font-size: 11px;
  font-weight: 800;
}

.thesis-card h3,
.idea-card h3,
.evidence-panel h3,
.sprint-grid h3,
.roadmap-grid h3 {
  margin: 44px 0 10px;
  font-family: "Manrope", sans-serif;
  font-size: 22px;
  line-height: 1.2;
  letter-spacing: -0.035em;
}

.thesis-card p,
.idea-card p,
.sprint-grid p,
.roadmap-grid p {
  margin: 0;
  color: var(--ink-soft);
}

.callout {
  margin-top: 18px;
  padding: 28px 30px;
  display: flex;
  align-items: flex-start;
  gap: 20px;
  border-radius: var(--radius);
  color: var(--white);
  background: var(--forest);
}

.callout-icon {
  flex: 0 0 auto;
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border-radius: 999px;
  color: var(--forest);
  background: var(--lime);
  font-weight: 800;
}

.callout strong {
  font-family: "Manrope", sans-serif;
  font-size: 17px;
}

.callout p {
  margin: 4px 0 0;
  color: rgba(255, 255, 255, 0.67);
}

.section-dark {
  width: 100%;
  max-width: none;
  padding: 112px max(20px, calc((100vw - var(--max)) / 2));
  color: var(--white);
  background:
    linear-gradient(rgba(255, 255, 255, 0.022) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.022) 1px, transparent 1px),
    var(--forest-2);
  background-size: 34px 34px;
}

.section-heading.light > p {
  color: rgba(255, 255, 255, 0.62);
}

.section-heading.light .eyebrow {
  color: var(--lime);
}

.quote-feature {
  padding: 64px 0 54px;
  position: relative;
  border-top: 1px solid rgba(255, 255, 255, 0.14);
  border-bottom: 1px solid rgba(255, 255, 255, 0.14);
}

.quote-mark {
  position: absolute;
  top: 28px;
  right: 2%;
  color: rgba(199, 243, 107, 0.11);
  font-family: Georgia, serif;
  font-size: 220px;
  line-height: 1;
  pointer-events: none;
}

.quote-feature blockquote {
  max-width: 980px;
  margin: 0;
  font-family: "Manrope", sans-serif;
  font-size: clamp(38px, 6vw, 74px);
  font-weight: 700;
  letter-spacing: -0.055em;
  line-height: 1.06;
}

.quote-cite {
  margin-top: 34px;
  display: flex;
  justify-content: space-between;
  gap: 20px;
  color: rgba(255, 255, 255, 0.58);
  font-size: 13px;
}

.quote-cite a,
.idea-card a {
  color: var(--lime);
  font-weight: 700;
  text-decoration: none;
}

.idea-grid {
  margin-top: 54px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.idea-card {
  min-height: 380px;
  padding: 28px;
  display: flex;
  flex-direction: column;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.04);
}

.idea-index {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(199, 243, 107, 0.4);
  border-radius: 999px;
  color: var(--lime);
  font-size: 11px;
  font-weight: 800;
}

.idea-card h3 {
  margin-top: 30px;
}

.idea-card p {
  color: rgba(255, 255, 255, 0.58);
}

.idea-card .short-quote {
  margin-bottom: 14px;
  color: var(--white);
  font-size: 17px;
  font-weight: 600;
}

.idea-card a {
  margin-top: auto;
  padding-top: 28px;
  font-size: 12px;
}

.gurley-synthesis {
  margin-top: 16px;
  padding: 26px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
  border-radius: var(--radius);
  color: var(--ink);
  background: var(--paper);
}

.gurley-synthesis p {
  max-width: 800px;
  margin: 6px 0 0;
}

.mini-label {
  color: var(--forest);
}

.evidence-layout {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: 18px;
}

.evidence-rail {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.evidence-tab {
  padding: 15px 18px;
  display: flex;
  align-items: center;
  gap: 14px;
  border: 1px solid transparent;
  border-radius: 14px;
  color: var(--ink-soft);
  background: transparent;
  text-align: left;
  cursor: pointer;
}

.evidence-tab span {
  font-size: 11px;
  font-weight: 800;
}

.evidence-tab.active {
  color: var(--ink);
  border-color: var(--line);
  background: var(--white);
  box-shadow: 0 12px 32px rgba(20, 37, 31, 0.07);
}

.evidence-panel {
  min-height: 490px;
  padding: 54px;
  border-radius: 30px;
  color: var(--white);
  background:
    radial-gradient(circle at 92% 5%, rgba(159, 201, 255, 0.26), transparent 18rem),
    var(--forest);
}

.evidence-panel[hidden] {
  display: none;
}

.evidence-panel .panel-label {
  color: var(--blue);
}

.evidence-panel h3 {
  max-width: 690px;
  margin: 68px 0 18px;
  font-size: clamp(32px, 4vw, 52px);
}

.evidence-panel > p {
  max-width: 760px;
  color: rgba(255, 255, 255, 0.65);
  font-size: 17px;
}

.panel-takeaway {
  margin: 42px 0 30px;
  padding: 20px;
  display: grid;
  grid-template-columns: 130px minmax(0, 1fr);
  gap: 18px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.05);
}

.panel-takeaway strong {
  color: var(--lime);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.panel-takeaway span {
  color: rgba(255, 255, 255, 0.76);
}

.evidence-panel > a {
  color: var(--white);
  font-size: 13px;
  font-weight: 700;
}

.practice-section {
  padding-bottom: 120px;
}

.answer-toolbar {
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.filter-group {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.chip {
  min-height: 38px;
  padding: 0 15px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--ink-soft);
  background: transparent;
  font-size: 12px;
  font-weight: 700;
  cursor: pointer;
}

.chip.active {
  color: var(--white);
  background: var(--forest);
}

.answer-list {
  border-top: 1px solid var(--line);
}

.answer-card {
  border-bottom: 1px solid var(--line);
}

.answer-card.filtered-out {
  display: none;
}

.answer-toggle {
  width: 100%;
  padding: 26px 4px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  border: 0;
  color: var(--ink);
  background: transparent;
  text-align: left;
  cursor: pointer;
}

.answer-toggle > span:first-child {
  display: flex;
  align-items: center;
  gap: 22px;
}

.answer-toggle strong {
  font-family: "Manrope", sans-serif;
  font-size: 22px;
  letter-spacing: -0.025em;
}

.answer-tag {
  min-width: 76px;
  padding: 5px 8px;
  border-radius: 999px;
  color: var(--forest);
  background: var(--lime-soft);
  font-size: 10px;
  font-weight: 800;
  text-align: center;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.toggle-icon {
  font-size: 26px;
  font-weight: 400;
}

.answer-body {
  padding: 0 62px 30px 102px;
}

.answer-body[hidden] {
  display: none;
}

.answer-body > p {
  max-width: 850px;
  margin: 0 0 18px;
  color: var(--ink-soft);
  font-size: 18px;
}

.answer-anchor {
  max-width: 850px;
  margin-bottom: 18px;
  padding: 12px 14px;
  border-left: 3px solid var(--orange);
  color: var(--ink-soft);
  background: rgba(241, 120, 73, 0.06);
  font-size: 13px;
}

.copy-button {
  padding: 0;
  border: 0;
  color: var(--forest);
  background: transparent;
  font-size: 12px;
  font-weight: 800;
  cursor: pointer;
}

.action-section {
  width: 100%;
  max-width: none;
  padding: 110px max(20px, calc((100vw - var(--max)) / 2));
  color: var(--white);
  background: var(--forest);
}

.sprint-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}

.sprint-grid article {
  min-height: 300px;
  padding: 26px;
  display: flex;
  flex-direction: column;
  border: 1px solid rgba(255, 255, 255, 0.13);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.04);
}

.sprint-grid article > span {
  color: var(--lime);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.sprint-grid h3 {
  margin-top: 42px;
}

.sprint-grid p {
  color: rgba(255, 255, 255, 0.58);
}

.sprint-grid label {
  margin-top: auto;
  padding-top: 26px;
  display: flex;
  align-items: center;
  gap: 9px;
  color: rgba(255, 255, 255, 0.68);
  font-size: 11px;
  cursor: pointer;
}

.sprint-grid input {
  accent-color: var(--lime);
}

.roadmap-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.roadmap-grid article {
  min-height: 280px;
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 253, 248, 0.72);
}

.status {
  display: inline-flex;
  padding: 5px 9px;
  border-radius: 999px;
  font-size: 9px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.status-next {
  color: var(--forest);
  background: var(--lime);
}

.status-queue {
  color: #754d00;
  background: #ffe0a6;
}

.status-watch {
  color: #234773;
  background: #dcecff;
}

.roadmap-grid h3 {
  margin-top: 48px;
}

.notebook-section {
  padding: 70px;
  display: grid;
  grid-template-columns: minmax(0, 0.7fr) minmax(380px, 1fr);
  gap: 70px;
  align-items: center;
  border: 1px solid var(--line);
  border-radius: 34px;
  background: var(--white);
  box-shadow: var(--shadow);
}

.notebook-copy h2 {
  font-size: clamp(38px, 4.6vw, 58px);
}

.notebook-copy p {
  max-width: 430px;
  color: var(--ink-soft);
}

.notebook-actions {
  margin-top: 30px;
  display: flex;
  align-items: center;
  gap: 18px;
}

.text-button {
  padding: 8px;
  border: 0;
  color: var(--ink-soft);
  background: transparent;
  font-size: 12px;
  cursor: pointer;
}

.notes-field {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.notes-field > span:first-child {
  font-size: 12px;
  font-weight: 800;
}

.notes-field textarea {
  width: 100%;
  min-height: 300px;
  padding: 20px;
  resize: vertical;
  border: 1px solid var(--line);
  border-radius: 18px;
  outline: none;
  color: var(--ink);
  background: var(--paper);
}

.notes-field textarea:focus {
  border-color: rgba(25, 53, 45, 0.5);
  box-shadow: 0 0 0 4px rgba(25, 53, 45, 0.07);
}

.save-status {
  color: #839088;
  font-size: 10px;
}

.sources-section {
  padding-top: 140px;
}

.source-groups {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.source-group {
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 253, 248, 0.7);
}

.source-group h3 {
  margin: 0 0 24px;
  font-family: "Manrope", sans-serif;
  font-size: 18px;
  letter-spacing: -0.025em;
}

.source-group ol {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: sources;
}

.source-group li {
  padding: 18px 0 18px 32px;
  border-top: 1px solid var(--line);
  position: relative;
  counter-increment: sources;
}

.source-group li::before {
  content: counter(sources, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 20px;
  color: #8e9791;
  font-size: 9px;
  font-weight: 800;
}

.source-group a {
  display: block;
  font-size: 13px;
  font-weight: 700;
  line-height: 1.4;
  text-decoration: none;
}

.source-group a:hover {
  text-decoration: underline;
}

.source-group span {
  margin-top: 6px;
  display: block;
  color: #778078;
  font-size: 10px;
  line-height: 1.45;
}

.source-note {
  margin-top: 16px;
  padding: 24px 28px;
  display: grid;
  grid-template-columns: 180px minmax(0, 1fr);
  gap: 24px;
  border-radius: var(--radius);
  color: var(--white);
  background: var(--forest);
}

.source-note strong {
  color: var(--lime);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.source-note p {
  margin: 0;
  color: rgba(255, 255, 255, 0.66);
}

.update-section {
  padding-bottom: 140px;
}

.update-log {
  border-top: 1px solid var(--line);
}

.update-log article {
  padding: 28px 0;
  display: grid;
  grid-template-columns: 140px minmax(0, 1fr);
  gap: 28px;
  border-bottom: 1px solid var(--line);
}

.update-log time {
  color: var(--ink-soft);
  font-size: 12px;
}

.update-log strong {
  font-family: "Manrope", sans-serif;
}

.update-log p {
  margin: 6px 0 0;
  color: var(--ink-soft);
}

.site-footer {
  width: min(calc(100% - 40px), var(--max));
  margin: 0 auto 30px;
  padding: 30px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
  border-radius: var(--radius);
  color: var(--white);
  background: var(--forest-2);
}

.site-footer > div {
  display: flex;
  align-items: center;
  gap: 16px;
}

.site-footer span,
.site-footer a {
  color: rgba(255, 255, 255, 0.55);
  font-size: 11px;
  text-decoration: none;
}

.toast {
  max-width: min(360px, calc(100vw - 40px));
  padding: 12px 16px;
  position: fixed;
  left: 50%;
  bottom: 24px;
  z-index: 50;
  border-radius: 999px;
  color: var(--white);
  background: var(--forest-2);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.2);
  font-size: 12px;
  font-weight: 700;
  transform: translate(-50%, 20px);
  opacity: 0;
  pointer-events: none;
  transition: opacity 180ms ease, transform 180ms ease;
}

.toast.show {
  opacity: 1;
  transform: translate(-50%, 0);
}

@media (max-width: 980px) {
  .desktop-nav {
    display: none;
  }

  .hero {
    grid-template-columns: 1fr;
    gap: 44px;
  }

  .hero-card {
    transform: none;
  }

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

  .signal-strip article:nth-child(2) {
    border-right: 0;
  }

  .signal-strip article:nth-child(-n+2) {
    border-bottom: 1px solid var(--line);
  }

  .section-heading {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .thesis-card,
  .thesis-card:nth-child(4),
  .thesis-card:nth-child(5) {
    grid-column: span 3;
  }

  .idea-grid,
  .roadmap-grid,
  .source-groups {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .notebook-section {
    padding: 44px;
    grid-template-columns: 1fr;
    gap: 40px;
  }
}

@media (max-width: 720px) {
  .site-header {
    width: min(calc(100% - 24px), var(--max));
    height: 68px;
    margin-top: 12px;
  }

  .brand > span:last-child {
    display: none;
  }

  .header-meta {
    font-size: 0;
  }

  .hero,
  .signal-strip,
  .section,
  .site-footer {
    width: min(calc(100% - 24px), var(--max));
  }

  .hero {
    margin-top: 54px;
  }

  .hero h1 {
    font-size: clamp(42px, 13.5vw, 58px);
  }

  .hero-lede {
    font-size: 17px;
  }

  .hero-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .hero-actions .button {
    width: 100%;
  }

  .signal-strip {
    grid-template-columns: 1fr;
  }

  .signal-strip article {
    min-height: 160px;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .signal-strip article:last-child {
    border-bottom: 0;
  }

  .section {
    padding: 78px 0;
  }

  .section-dark,
  .action-section {
    width: 100%;
    padding: 84px 12px;
  }

  .thesis-grid,
  .idea-grid,
  .sprint-grid,
  .roadmap-grid,
  .source-groups {
    grid-template-columns: 1fr;
  }

  .thesis-card,
  .thesis-card:nth-child(4),
  .thesis-card:nth-child(5) {
    grid-column: auto;
  }

  .quote-feature blockquote {
    font-size: 42px;
  }

  .quote-cite,
  .gurley-synthesis,
  .answer-toolbar,
  .site-footer {
    align-items: flex-start;
    flex-direction: column;
  }

  .idea-card {
    min-height: 340px;
  }

  .evidence-layout {
    grid-template-columns: 1fr;
  }

  .evidence-rail {
    padding-bottom: 8px;
    flex-direction: row;
    overflow-x: auto;
  }

  .evidence-tab {
    flex: 0 0 auto;
  }

  .evidence-panel {
    min-height: 540px;
    padding: 32px 24px;
  }

  .evidence-panel h3 {
    margin-top: 48px;
  }

  .panel-takeaway {
    grid-template-columns: 1fr;
  }

  .answer-toggle > span:first-child {
    align-items: flex-start;
    flex-direction: column;
    gap: 10px;
  }

  .answer-toggle strong {
    font-size: 19px;
  }

  .answer-body {
    padding: 0 4px 26px;
  }

  .answer-body > p {
    font-size: 16px;
  }

  .notebook-section {
    width: min(calc(100% - 24px), var(--max));
    padding: 30px 22px;
  }

  .source-note {
    grid-template-columns: 1fr;
  }

  .update-log article {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .site-footer > div {
    align-items: flex-start;
    flex-direction: column;
    gap: 6px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
  }
}