/* AI Practitioner Circle — REBOOT
   Shared stylesheet: reboot/index.html + reboot/thank-you/index.html
   Design tokens: 02-Reboot-Landing-Page-Spec.md
   Form tokens:   03-Apply-Page-Spec.md                              */

/* ================================================================
   Fonts
   ================================================================ */
@import url('https://fonts.googleapis.com/css2?family=Newsreader:ital,opsz,wght@0,6..72,400;0,6..72,500;1,6..72,400;1,6..72,500&family=Geist+Mono:wght@400;500&display=swap');

/* ================================================================
   Design tokens
   ================================================================ */
:root {
  /* Surfaces */
  --paper-0:   #FFFFFF;
  --paper-50:  #FBFAF6;
  --paper-100: #F5F2EB;
  --paper-200: #ECE7DC;

  /* Ink */
  --ink-900: #111111;
  --ink-700: #1B2540;
  --ink-500: #3E4A6B;
  --ink-400: #5A6680;
  --ink-300: #8A9AB4;

  /* Signal (clay/terracotta) */
  --signal-100: #FAF0EB;
  --signal-400: #D07D5E;
  --signal-500: #B85C3A;
  --signal-600: #8F3E23;

  /* System blue */
  --pract-500: #3D6090;

  /* Aliases */
  --border: var(--paper-200);

  /* Typography */
  --font-serif: 'Newsreader', 'Source Serif 4', Georgia, serif;
  --font-mono:  'Geist Mono', 'IBM Plex Mono', ui-monospace, monospace;

  /* Layout */
  --container-wide:   1320px;
  --container:        1080px;
  --container-narrow: 680px;
  --side-pad: 32px;

  /* Spacing */
  --space-section: 96px;

  /* Radii */
  --r-sm: 4px;
  --r-md: 6px;
  --r-lg: 10px;

  /* Shadows */
  --shadow-1: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);

  /* Motion */
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
}

/* ================================================================
   Reset
   ================================================================ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-serif);
  font-optical-sizing: auto;
  color: var(--ink-900);
  background: var(--paper-50);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  line-height: 1.5;
}

img {
  display: block;
  max-width: 100%;
}

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

/* ================================================================
   Typography
   ================================================================ */
.h-display {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: 72px;
  line-height: 1.02;
  letter-spacing: -0.025em;
}

.h1 {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: 64px;
  line-height: 1.04;
  letter-spacing: -0.025em;
}

.h2 {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: 52px;
  line-height: 1.06;
  letter-spacing: -0.02em;
}

.h3 {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: 30px;
  line-height: 1.15;
  letter-spacing: -0.01em;
}

.h4 {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: 21px;
  line-height: 1.3;
}

.eyebrow {
  font-family: var(--font-mono);
  font-weight: 400;
  font-size: 15px;
  text-transform: uppercase;
  letter-spacing: 0.10em;
  color: var(--signal-500);
}

.lede {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: 22px;
  line-height: 1.5;
  color: var(--ink-700);
}

.body {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: 19px;
  line-height: 1.6;
}

.body-sm {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: 16px;
  line-height: 1.5;
  color: var(--ink-700);
}

.caption {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: 14px;
  line-height: 1.45;
  color: var(--ink-500);
}

.serif-quote {
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 400;
  font-size: 52px;
  line-height: 1.1;
  color: var(--signal-400);
}

.numeric {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

/* Italic in headings on light bg = clay */
.h1 em, .h2 em, .h3 em, .h-display em {
  font-style: italic;
  color: var(--signal-500);
}

/* ================================================================
   Layout
   ================================================================ */
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--side-pad);
}

.container-narrow {
  max-width: var(--container-narrow);
  margin: 0 auto;
  padding: 0 var(--side-pad);
}

.section {
  padding: var(--space-section) 0;
}

.section--tall {
  padding: 128px 0;
}

.section--tight {
  padding: 80px 0;
}

.section--paper-100 {
  background: var(--paper-100);
}

/* ================================================================
   Navigation
   ================================================================ */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(251, 250, 246, 0.94);
  backdrop-filter: saturate(140%) blur(8px);
  -webkit-backdrop-filter: saturate(140%) blur(8px);
  border-bottom: 1px solid transparent;
  transition: border-color 200ms var(--ease);
}

.nav.scrolled {
  border-bottom-color: var(--paper-200);
}

.nav-inner {
  max-width: var(--container-wide);
  margin: 0 auto;
  padding: 0 var(--side-pad);
  height: 64px;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
}

.nav-links {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 28px;
}

.nav-link--active {
  border-bottom-color: var(--ink-900);
}

.nav-cta {
  display: flex;
  justify-content: flex-end;
  align-items: center;
}

.nav-brand {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: 15px;
  letter-spacing: -0.005em;
  color: var(--ink-900);
}

.nav-link {
  font-family: var(--font-serif);
  font-size: 16px;
  color: var(--ink-900);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 150ms;
  padding-bottom: 1px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.nav-link:hover {
  border-bottom-color: var(--ink-900);
}

/* ================================================================
   Buttons
   ================================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: 18px;
  line-height: 1;
  padding: 14px 32px;
  border-radius: var(--r-md);
  border: 1.5px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition:
    background 150ms var(--ease),
    color 150ms var(--ease),
    border-color 150ms var(--ease);
  white-space: nowrap;
}

.btn-signal {
  background: var(--signal-500);
  color: var(--paper-50);
  border-color: var(--signal-500);
}

.btn-signal:hover {
  background: var(--signal-600);
  border-color: var(--signal-600);
}

.btn-primary {
  background: var(--ink-900);
  color: var(--paper-50);
  border-color: var(--ink-900);
}

.btn-primary:hover {
  background: var(--ink-700);
  border-color: var(--ink-700);
}

.btn-ghost {
  background: transparent;
  color: var(--ink-900);
  border-color: transparent;
  padding-left: 0;
  padding-right: 0;
}

.btn-ghost:hover {
  color: var(--signal-600);
}

/* ================================================================
   Dark sections  (VP2, Graduation Standard, Apply CTA)
   ================================================================ */
.dark {
  background: var(--ink-900);
  color: var(--paper-50);
}

.dark .h1,
.dark .h2,
.dark .h3,
.dark .h4 {
  color: var(--paper-50);
  font-weight: 500;
  letter-spacing: 0;
}

.dark .eyebrow {
  color: rgba(232, 160, 128, 0.65);
}

.dark .lede {
  color: rgba(251, 250, 246, 0.82);
  font-size: 20px;
  line-height: 1.65;
}

.dark .body {
  color: rgba(251, 250, 246, 0.82);
  font-size: 20px;
  line-height: 1.65;
}

.dark .body-sm {
  color: rgba(251, 250, 246, 0.65);
}

.dark .caption {
  color: rgba(251, 250, 246, 0.4);
}

/* Italic/em on dark = light terracotta — must come after all global em rules */
.dark em,
.dark i {
  color: #E8A080;
}

.dark .h1 em,
.dark .h2 em,
.dark .h3 em {
  font-style: italic;
  color: #E8A080;
}

/* Pull quote body stays at signal-400 on dark; only the typographic quote marks get E8A080 */
.dark .serif-quote {
  color: var(--signal-400);
}

.dark .serif-quote .q-mark {
  color: #E8A080;
}

/* ================================================================
   Hero
   ================================================================ */
.hero-h1 {
  font-size: 64px;
}

.hero-line {
  display: block;
}

.hero-line:not(:last-child) {
  margin-bottom: 0.3em;
}

.hero-eyebrow-gap {
  margin-top: 48px;
}

.container-hero {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--side-pad);
}

@media (max-width: 900px) {
  .hero-h1 { font-size: 42px; }
}

@media (max-width: 600px) {
  .hero-h1 { font-size: 38px; }
}

.hero-section {
  padding: 128px 0 96px;
}

.hero-cta {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 40px;
}

.hero-proof {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--ink-400);
  margin-top: 20px;
  white-space: nowrap;
  flex-wrap: wrap;
}

.hero-proof .dot {
  width: 3px;
  height: 3px;
  background: var(--ink-300);
  border-radius: 50%;
  display: inline-block;
}

.hero-rule {
  border: none;
  border-top: 1px solid var(--paper-200);
}

/* ================================================================
   VP1 — Job rows
   ================================================================ */
.job-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin: 28px 0;
}

.job-row {
  display: grid;
  grid-template-columns: 52px 1fr;
  align-items: center;
  gap: 16px;
  padding: 16px 20px;
  background: var(--paper-100);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
}

.job-row .num {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--signal-600);
  letter-spacing: 0.02em;
  font-variant-numeric: tabular-nums;
}

.job-row .label {
  font-family: var(--font-serif);
  font-size: 16px;
  line-height: 1.45;
  color: var(--ink-900);
}

/* ================================================================
   Illustration placeholder
   ================================================================ */
.illus-placeholder {
  background: var(--paper-100);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  min-height: 360px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 64px;
  color: var(--ink-400);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  text-align: center;
  padding: 32px;
}

/* ================================================================
   VP3 — Feature tiles
   ================================================================ */
.tile-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 48px;
}

.tile {
  background: var(--paper-100);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.tile-icon {
  display: block;
  width: 20px;
  height: 20px;
  margin-bottom: 4px;
  color: var(--ink-700);
}

/* ================================================================
   VP5 — Callout box
   ================================================================ */
.callout {
  background: var(--signal-100);
  border-left: 3px solid var(--signal-600);
  border-radius: var(--r-md);
  padding: 20px 24px;
  margin-top: 32px;
}

/* ================================================================
   VP4 — Founder card
   ================================================================ */
.founder-card {
  background: var(--paper-0);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: 24px;
  margin-top: 40px;
}

.founder-card .attr {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 12px;
}

.founder-card-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
}

/* ================================================================
   Section 9 — Filter cards (Not For)
   ================================================================ */
.filter-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 48px;
}

.filter-card {
  background: var(--paper-100);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.filter-card .x-mark {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--ink-300);
  text-transform: uppercase;
  margin-bottom: 4px;
}

/* ================================================================
   Section 10 — Requirements checklist
   ================================================================ */
.req-list {
  margin-top: 32px;
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  overflow: hidden;
}

.req-row {
  display: grid;
  grid-template-columns: 28px 1fr;
  align-items: flex-start;
  gap: 16px;
  padding: 18px 22px;
  background: var(--paper-0);
  border-bottom: 1px solid var(--border);
}

.req-row:last-child {
  border-bottom: none;
}

.req-box {
  width: 18px;
  height: 18px;
  border: 1.5px solid var(--signal-500);
  border-radius: 4px;
  margin-top: 3px;
  flex-shrink: 0;
}

/* ================================================================
   Section 11 — Proof
   ================================================================ */
.proof-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: start;
  margin-top: 48px;
}

.proof-list {
  display: flex;
  flex-direction: column;
}

.proof-item {
  padding: 22px 0;
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.proof-item:last-child {
  border-bottom: 1px solid var(--border);
}

.founder-panel {
  background: var(--paper-100);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: 32px;
}

.founder-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 20px;
}

.founder-avatar {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  object-fit: cover;
  display: block;
  flex-shrink: 0;
}

.illus-img {
  display: block;
  width: 100%;
  border-radius: var(--r-lg);
  margin-top: 64px;
  border: 1px solid var(--border);
}

/* ================================================================
   Section 12 — FAQ accordion
   ================================================================ */
.faq-list {
  margin-top: 40px;
}

.faq-item {
  border-bottom: 1px solid var(--border);
}

.faq-item:first-child {
  border-top: 1px solid var(--border);
}

.faq-q {
  width: 100%;
  display: grid;
  grid-template-columns: 1fr 28px;
  align-items: center;
  gap: 16px;
  padding: 22px 4px;
  text-align: left;
  background: none;
  border: none;
  cursor: pointer;
  font-family: inherit;
}

.faq-q-text {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: 18px;
  letter-spacing: -0.005em;
  line-height: 1.4;
  color: var(--ink-900);
}

.faq-icon {
  font-family: var(--font-mono);
  font-size: 20px;
  color: var(--ink-400);
  font-weight: 400;
  text-align: center;
  line-height: 1;
  transition: transform 200ms var(--ease), color 200ms var(--ease);
}

.faq-q:hover .faq-icon {
  color: var(--signal-600);
}

.faq-q[aria-expanded="true"] .faq-icon {
  transform: rotate(45deg);
  color: var(--signal-600);
}

.faq-a {
  overflow: hidden;
  max-height: 0;
  transition: max-height 250ms var(--ease), padding 250ms var(--ease);
  padding: 0 4px;
}

.faq-a.open {
  max-height: 600px;
  padding: 0 4px 22px;
}

/* ================================================================
   Section 13 — Apply CTA (dark) pricing block
   ================================================================ */
.pricing-block {
  background: var(--paper-100);
  border-radius: var(--r-lg);
  padding: 20px 32px;
  margin: 40px auto 0;
  display: inline-flex;
  flex-direction: column;
  gap: 10px;
}

.pricing-row {
  display: flex;
  align-items: baseline;
  gap: 20px;
}

/* ================================================================
   Section 13b — Application form
   ================================================================ */
.form-section {
  padding: 72px 0 96px;
}

.apply-form {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.form-field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-label {
  font-family: var(--font-serif);
  font-size: 16px;
  line-height: 1.5;
  color: var(--ink-700);
}

.form-label .req {
  color: var(--signal-500);
  margin-left: 4px;
  font-style: normal;
}

.form-helper {
  font-family: var(--font-serif);
  font-size: 14px;
  line-height: 1.45;
  color: var(--ink-500);
  margin-top: 4px;
}

.form-input,
.form-textarea {
  font-family: var(--font-serif);
  font-optical-sizing: auto;
  font-size: 19px;
  line-height: 1.6;
  color: var(--ink-900);
  background: #FFFFFF;
  border: 1px solid var(--paper-200);
  border-radius: var(--r-md);
  padding: 14px 16px;
  width: 100%;
  appearance: none;
  transition: border-color 150ms ease, border-width 150ms ease;
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--ink-500);
  font-style: italic;
}

.form-input:focus,
.form-textarea:focus {
  outline: none;
  border-width: 1.5px;
  border-color: var(--signal-500);
}

.form-input.error,
.form-textarea.error {
  border-width: 1.5px;
  border-color: #C0392B;
}

.form-textarea {
  min-height: 160px;
  resize: vertical;
}

.radio-group {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 4px;
}

.radio-option {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  cursor: pointer;
}

.radio-option input[type="radio"] {
  margin-top: 4px;
  accent-color: var(--signal-500);
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  cursor: pointer;
}

.radio-option span {
  font-family: var(--font-serif);
  font-size: 19px;
  line-height: 1.5;
  color: var(--ink-900);
}

.field-error {
  font-family: var(--font-serif);
  font-size: 14px;
  color: #C0392B;
  display: none;
  margin-top: 2px;
}

.submit-error-banner {
  display: none;
  background: var(--paper-100);
  border: 1px solid var(--paper-200);
  border-radius: 8px;
  padding: 16px;
  margin-bottom: 16px;
  font-family: var(--font-serif);
  font-size: 16px;
  line-height: 1.5;
  color: var(--ink-700);
}

.btn-submit {
  font-family: var(--font-serif);
  font-optical-sizing: auto;
  font-weight: 400;
  font-size: 19px;
  line-height: 1;
  background: var(--signal-500);
  color: var(--paper-50);
  border: none;
  border-radius: var(--r-md);
  padding: 16px 32px;
  min-width: 240px;
  cursor: pointer;
  transition: background 150ms var(--ease);
  display: inline-block;
}

.btn-submit:hover:not(:disabled) {
  background: var(--signal-600);
}

.btn-submit:disabled {
  opacity: 0.7;
  cursor: not-allowed;
}

.form-microcopy {
  font-family: var(--font-serif);
  font-size: 14px;
  line-height: 1.45;
  color: var(--ink-500);
  margin-top: 12px;
}

/* ================================================================
   Footer
   ================================================================ */
.footer {
  background: var(--paper-50);
  border-top: 1px solid var(--paper-200);
  padding: 32px 0;
}

/* ================================================================
   Thank-you page
   ================================================================ */
.thankyou-content {
  text-align: center;
  padding: 120px 0 80px;
}

.thankyou-divider {
  border: none;
  border-top: 1px solid var(--paper-200);
  margin: 48px 0;
}

.thankyou-email-link {
  color: var(--signal-500);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 150ms;
}

.thankyou-email-link:hover {
  border-bottom-color: var(--signal-500);
}

/* ================================================================
   S3 — Work OS nodes (5-tile grid)
   ================================================================ */
.work-os-nodes {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 48px;
}

/* ================================================================
   S4 — Before/After comparison table
   ================================================================ */
.comparison-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  margin-top: 40px;
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 560px;
}

.comparison-table th,
.comparison-table td {
  padding: 16px 20px;
  vertical-align: top;
  text-align: left;
  border-bottom: 1px solid var(--border);
  border-right: 1px solid var(--border);
}

.comparison-table tr:last-child td {
  border-bottom: none;
}

.comparison-table th:last-child,
.comparison-table td:last-child {
  border-right: none;
}

.comparison-table thead th {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  background: var(--paper-100);
}

.comparison-table thead th.col-label {
  color: var(--ink-300);
  width: 130px;
}

.comparison-table thead th.col-joe {
  color: var(--ink-400);
}

.comparison-table thead th.col-jane {
  color: var(--signal-600);
  background: var(--signal-100);
}

.comparison-table tbody td.col-label {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--ink-400);
  background: var(--paper-100);
  white-space: nowrap;
}

.comparison-table tbody td.col-joe {
  font-family: var(--font-serif);
  font-size: 16px;
  line-height: 1.55;
  color: var(--ink-500);
}

.comparison-table tbody td.col-jane {
  font-family: var(--font-serif);
  font-size: 16px;
  line-height: 1.55;
  color: var(--ink-900);
  background: var(--signal-100);
}

/* ================================================================
   S6 — Delivery grid + split
   ================================================================ */
.delivery-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-top: 48px;
}

.delivery-card {
  background: var(--paper-0);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: 28px;
}


/* ================================================================
   S7 — Substack inline link
   ================================================================ */
.substack-link {
  color: var(--signal-500);
  border-bottom: 1px solid var(--signal-400);
  transition: color 150ms, border-color 150ms;
}

.substack-link:hover {
  color: var(--signal-600);
  border-bottom-color: var(--signal-600);
}

/* ================================================================
   Greaser — transitional whisper at light section boundaries
   ================================================================ */
.greaser {
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 400;
  font-size: 16px;
  line-height: 1.5;
  color: var(--ink-500);
  text-align: center;
  margin-top: 40px;
  margin-bottom: 0;
}

/* ================================================================
   Spacing utilities
   ================================================================ */
.mt-4  { margin-top: 4px; }
.mt-8  { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mt-20 { margin-top: 20px; }
.mt-24 { margin-top: 24px; }
.mt-32 { margin-top: 32px; }
.mt-40 { margin-top: 40px; }
.mt-48 { margin-top: 48px; }
.mt-64 { margin-top: 64px; }

/* ================================================================
   Responsive
   ================================================================ */
@media (max-width: 900px) {
  :root {
    --side-pad: 20px;
    --space-section: 64px;
  }

  .h1          { font-size: 46px; }
  .h2          { font-size: 38px; }
  .h3          { font-size: 28px; }
  .lede        { font-size: 19px; }
  .serif-quote { font-size: 38px; }

  .section--tall { padding: 88px 0; }
  .hero-section  { padding: 88px 0 64px; }

  .nav-inner { height: 56px; }

  .tile-row        { grid-template-columns: 1fr; }
  .work-os-nodes   { grid-template-columns: repeat(2, 1fr); }
  .filter-grid     { grid-template-columns: 1fr 1fr; }
  .proof-grid      { grid-template-columns: 1fr; gap: 40px; }
  .delivery-grid   { grid-template-columns: 1fr; }

  .btn-submit  { width: 100%; min-width: unset; }
}

@media (max-width: 600px) {
  .h1 { font-size: 38px; }
  .h2 { font-size: 32px; }
  .h3 { font-size: 26px; }

  .hero-cta      { flex-direction: column; align-items: flex-start; gap: 12px; }
  .filter-grid   { grid-template-columns: 1fr; }
  .work-os-nodes { grid-template-columns: 1fr; }

  .pricing-block { padding: 16px 20px; }

  .nav-links { display: none; }
}