:root {
    --navy: #1F2A44;
    --navy-soft: #364568;
    --copper: #B5651D;
    --copper-text: #95500E;
    --copper-soft: #D68A4C;
    --teal: #3F6E63;
    --ink: #1A1D24;
    --ink-soft: #4B4F58;
    --paper: #F5F6F4;
    --paper-alt: #ECEEE9;
    --line: #D8DCD6;
    --white: #FFFFFF;
    --display: 'Space Grotesk', sans-serif;
    --body: 'Source Serif 4', serif;
    --mono: 'IBM Plex Mono', monospace;
  }

  * { margin: 0; padding: 0; box-sizing: border-box; }

  html { scroll-behavior: smooth; }

  body {
    font-family: var(--body);
    color: var(--ink);
    background: var(--paper);
    line-height: 1.6;
    font-size: 18px;
    -webkit-font-smoothing: antialiased;
  }

  a { color: inherit; }

  .wrap {
    max-width: 1120px;
    margin: 0 auto;
    padding: 0 32px;
  }

  h1, h2, h3, .display {
    font-family: var(--display);
    color: var(--navy);
    letter-spacing: -0.01em;
    font-weight: 600;
  }

  .eyebrow {
    font-family: var(--mono);
    font-size: 13px;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--copper-text);
    display: inline-block;
    margin-bottom: 14px;
  }

  /* ---------- NAV ---------- */
  header.site {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(245, 246, 244, 0.92);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--line);
  }
  header.site .wrap {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
  }
  .brand {
    font-family: var(--display);
    font-weight: 700;
    font-size: 19px;
    color: var(--navy);
    text-decoration: none;
    letter-spacing: -0.01em;
  }
  .brand span { color: var(--copper); }
  nav.links { display: flex; gap: 32px; align-items: center; }
  nav.links a {
    font-family: var(--mono);
    font-size: 13px;
    text-decoration: none;
    color: var(--ink-soft);
    letter-spacing: 0.02em;
  }
  nav.links a:hover { color: var(--copper); }
  .nav-cta {
    background: var(--navy);
    color: var(--white) !important;
    padding: 10px 20px;
    border-radius: 3px;
    font-weight: 500;
  }
  .nav-cta:hover { background: var(--copper-text); }
  @media (max-width: 720px) {
    nav.links a:not(.nav-cta) { display: none; }
  }

  /* ---------- SIGNAL LINE (signature element) ---------- */
  .signal-track {
    position: relative;
    width: 100%;
    overflow: hidden;
    line-height: 0;
  }
  .signal-track svg { display: block; width: 100%; height: auto; }
  .signal-path {
    fill: none;
    stroke: var(--teal);
    stroke-width: 1.6;
    stroke-linecap: round;
    opacity: 0.55;
  }
  .signal-event {
    fill: var(--copper);
  }
  .signal-event-ring {
    fill: none;
    stroke: var(--copper);
    stroke-width: 1.2;
    opacity: 0.5;
  }
  @media (prefers-reduced-motion: no-preference) {
    .signal-event-ring { animation: pulse-ring 2.6s ease-out infinite; }
    .signal-event { animation: pulse-dot 2.6s ease-out infinite; }
  }
  @keyframes pulse-ring {
    0% { r: 3; opacity: 0.6; }
    70% { r: 13; opacity: 0; }
    100% { r: 13; opacity: 0; }
  }
  @keyframes pulse-dot {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.65; }
  }

  /* ---------- HERO ---------- */
  .hero {
    padding: 96px 0 40px;
  }
  .hero .wrap { max-width: 880px; }
  .hero h1 {
    font-size: clamp(36px, 5vw, 56px);
    line-height: 1.08;
    margin-bottom: 28px;
  }
  .hero h1 em {
    font-style: normal;
    color: var(--copper);
  }
  .hero p.lede {
    font-size: 21px;
    color: var(--ink-soft);
    max-width: 620px;
    margin-bottom: 40px;
  }
  .hero-ctas { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 8px; }

  .btn {
    display: inline-block;
    font-family: var(--display);
    font-weight: 600;
    font-size: 15px;
    padding: 14px 28px;
    border-radius: 3px;
    text-decoration: none;
    transition: background 0.15s ease, transform 0.1s ease;
    cursor: pointer;
    border: none;
  }
  .btn:active { transform: translateY(1px); }
  .btn-primary { background: var(--navy); color: var(--white); }
  .btn-primary:hover { background: var(--copper-text); }
  .btn-ghost {
    background: transparent;
    color: var(--navy);
    border: 1.5px solid var(--navy);
  }
  .btn-ghost:hover { border-color: var(--copper-text); color: var(--copper-text); }

  /* ---------- SECTIONS ---------- */
  section { padding: 72px 0; }
  .section-alt { background: var(--paper-alt); }
  .rule {
    border: none;
    border-top: 1px solid var(--line);
  }

  .manifesto {
    max-width: 780px;
    font-size: 20px;
    line-height: 1.75;
    color: var(--ink);
  }
  .manifesto .stat {
    font-family: var(--mono);
    font-weight: 500;
    color: var(--navy);
    background: linear-gradient(transparent 68%, rgba(181,101,29,0.22) 0%);
    padding: 0 2px;
  }
  .manifesto p { margin-bottom: 22px; }
  .manifesto p:last-child { margin-bottom: 0; }

  h2.section-title {
    font-size: clamp(26px, 3.4vw, 34px);
    max-width: 640px;
    margin-bottom: 20px;
  }
  .section-intro {
    max-width: 620px;
    color: var(--ink-soft);
    font-size: 18px;
    margin-bottom: 48px;
  }

  /* ---------- APPROACH: five-stage timeline ---------- */
  .timeline { padding: 8px 0 0; }
  .timeline-item {
    position: relative;
    display: flex;
    gap: 32px;
    padding-bottom: 44px;
  }
  .timeline-item:last-child { padding-bottom: 0; }
  .timeline-marker {
    position: relative;
    flex: 0 0 16px;
    display: flex;
    justify-content: center;
  }
  .timeline-marker::before {
    content: '';
    position: absolute;
    top: 18px;
    bottom: -44px;
    width: 2px;
    background: var(--teal);
    opacity: 0.35;
  }
  .timeline-item:last-child .timeline-marker::before { display: none; }
  .timeline-dot {
    position: relative;
    z-index: 1;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--copper);
    border: 4px solid var(--paper-alt);
    margin-top: 3px;
  }
  .timeline-content { flex: 1; padding-top: 2px; }
  .timeline-content .k {
    font-family: var(--mono);
    font-size: 14px;
    color: var(--copper-text);
    display: block;
    margin-bottom: 8px;
    letter-spacing: 0.02em;
  }
  .timeline-content p {
    color: var(--ink);
    font-size: 17.5px;
    line-height: 1.6;
    margin: 0;
    max-width: 640px;
  }
  @media (max-width: 700px) {
    .timeline-item { gap: 20px; padding-bottom: 34px; }
    .timeline-content p { font-size: 16.5px; }
  }

  /* ---------- PROOF (field note) ---------- */
  .field-note {
    max-width: 880px;
    background: var(--white);
    border: 1px solid var(--line);
    border-left: 3px solid var(--teal);
    padding: 40px 44px;
    border-radius: 2px;
  }
  .field-note .eyebrow { color: var(--teal); }
  .field-note p { font-size: 18px; color: var(--ink); }
  .field-note .findings {
    margin-top: 22px;
    padding-top: 22px;
    border-top: 1px solid var(--line);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px 40px;
  }
  .finding .tag {
    font-family: var(--mono);
    font-size: 12px;
    color: var(--copper-text);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    display: block;
    margin-bottom: 8px;
  }
  .finding p { font-size: 16px; line-height: 1.55; color: var(--ink-soft); }
  @media (max-width: 700px) {
    .field-note { padding: 28px 24px; }
    .field-note .findings { grid-template-columns: 1fr; }
  }

  /* ---------- AUDIENCE ---------- */
  .audience-list {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 40px;
  }
  .audience-item h3 {
    font-size: 19px;
    margin-bottom: 10px;
    padding-bottom: 14px;
    border-bottom: 2px solid var(--copper);
    display: inline-block;
  }
  .audience-item p { color: var(--ink-soft); font-size: 16.5px; }
  @media (max-width: 860px) {
    .audience-list { grid-template-columns: 1fr; gap: 32px; }
  }

  /* ---------- CONTACT / FORM ---------- */
  .contact-layout {
    display: grid;
    grid-template-columns: 1fr 1.1fr;
    gap: 64px;
    align-items: start;
  }
  .contact-copy h2 { margin-bottom: 20px; }
  .contact-copy p { color: var(--ink-soft); font-size: 17px; margin-bottom: 16px; }
  .contact-detail {
    margin-top: 32px;
    font-family: var(--mono);
    font-size: 14px;
    color: var(--ink-soft);
  }
  .contact-detail a { color: var(--navy); text-decoration: none; border-bottom: 1px solid var(--copper); }

  form.inquiry {
    background: var(--white);
    border: 1px solid var(--line);
    border-radius: 4px;
    padding: 36px;
  }
  .field { margin-bottom: 20px; }
  .field label {
    display: block;
    font-family: var(--mono);
    font-size: 12.5px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--ink-soft);
    margin-bottom: 7px;
  }
  .field input,
  .field select,
  .field textarea {
    width: 100%;
    padding: 12px 14px;
    border: 1px solid var(--line);
    border-radius: 3px;
    font-family: var(--body);
    font-size: 16px;
    background: var(--paper);
    color: var(--ink);
  }
  .field textarea { resize: vertical; min-height: 100px; }
  .field input:focus,
  .field select:focus,
  .field textarea:focus {
    outline: none;
    border-color: var(--copper);
    box-shadow: 0 0 0 3px rgba(181, 101, 29, 0.12);
  }
  .field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
  @media (max-width: 560px) { .field-row { grid-template-columns: 1fr; } }

  .form-msg {
    margin-top: 16px;
    font-family: var(--mono);
    font-size: 14px;
    padding: 12px 14px;
    border-radius: 3px;
    display: none;
  }
  .form-msg.show { display: block; }
  .form-msg.ok { background: rgba(63, 110, 99, 0.12); color: var(--teal); }
  .form-msg.err { background: rgba(149, 80, 14, 0.12); color: var(--copper-text); }

  @media (max-width: 860px) {
    .contact-layout { grid-template-columns: 1fr; }
  }

  /* ---------- FOOTER ---------- */
  footer {
    padding: 48px 0;
    border-top: 1px solid var(--line);
  }
  footer .wrap {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
  }
  footer .tag {
    font-family: var(--display);
    font-weight: 600;
    color: var(--navy);
    font-size: 15px;
  }
  footer .tag span { color: var(--copper); }
  footer .meta {
    font-family: var(--mono);
    font-size: 13px;
    color: var(--ink-soft);
  }

  ::selection { background: rgba(181, 101, 29, 0.25); }