:root {
  --ink: #12161c;
  --ink-soft: #4a5261;
  --paper: #fbfaf8;
  --paper-alt: #f2efe9;
  --line: #e2ded4;
  --accent: #1f4d3f;
  --accent-soft: #e8efe9;
  --header-bg: rgba(251, 250, 248, 0.92);
  --max-w: 1080px;
  --radius: 4px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}

h1, h2, h3 {
  font-family: "Iowan Old Style", "Georgia", "Times New Roman", serif;
  line-height: 1.15;
  margin: 0 0 16px;
  letter-spacing: -0.01em;
}

h1 { font-size: clamp(2.1rem, 5vw, 3.4rem); }
h2 { font-size: clamp(1.6rem, 3.5vw, 2.3rem); }
h3 { font-size: 1.15rem; margin-bottom: 8px; }

p { margin: 0 0 16px; color: var(--ink-soft); }

a { color: var(--accent); }

.eyebrow {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 12px;
}

.section-sub {
  max-width: 620px;
  font-size: 1.05rem;
}

/* Header */

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--header-bg);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.wordmark {
  font-family: "Iowan Old Style", Georgia, serif;
  font-weight: 600;
  font-size: 1.05rem;
}

.site-header nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.site-header nav a {
  color: var(--ink);
  text-decoration: none;
  font-size: 0.92rem;
}

.site-header nav a:hover { color: var(--accent); }

.nav-cta {
  border: 1px solid var(--ink);
  padding: 7px 14px;
  border-radius: var(--radius);
}

.nav-cta:hover {
  background: var(--ink);
  color: var(--paper) !important;
}

/* Hero */

.hero {
  padding: 96px 0 72px;
}

.hero-sub {
  max-width: 620px;
  font-size: 1.15rem;
}

.hero-actions {
  display: flex;
  gap: 14px;
  margin-top: 32px;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  text-decoration: none;
  font-size: 0.95rem;
  padding: 13px 24px;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  font-family: inherit;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.btn-primary:hover { background: #163a30; }

.btn-ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--line);
}

.btn-ghost:hover { border-color: var(--ink); }

.btn-block { width: 100%; }

/* Problem strip */

.problem {
  background: var(--paper-alt);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 56px 0;
}

.problem-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 40px 32px;
}

.problem-item h3 { font-size: 1.05rem; }
.problem-item p { font-size: 0.95rem; margin-bottom: 0; }

/* How it works */

.how { padding: 88px 0; }

.phases {
  list-style: none;
  margin: 48px 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.phase {
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 24px;
  padding: 28px 0;
  border-bottom: 1px solid var(--line);
}

.phase-num {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 0.95rem;
  color: var(--accent);
  padding-top: 4px;
}

.phase-body p { max-width: 620px; margin-bottom: 0; }

/* Case study */

.case-study {
  background: var(--paper-alt);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 88px 0;
}

.findings {
  margin-top: 40px;
  border-top: 1px solid var(--line);
}

.finding {
  padding: 28px 0;
  border-bottom: 1px solid var(--line);
}

.finding h3 { font-size: 1.15rem; }
.finding p { max-width: 700px; margin-bottom: 12px; }
.finding p:last-child { margin-bottom: 0; }

/* About */

.about {
  background: var(--paper-alt);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 88px 0;
}

.about-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 48px;
}

.about-photo {
  width: 128px;
  height: 128px;
  border-radius: 50%;
  object-fit: cover;
  margin-bottom: 24px;
  border: 1px solid var(--line);
}

.about-body p { font-size: 1.02rem; }

/* Contact */

.contact { padding: 88px 0 104px; }

.contact-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 56px;
  align-items: start;
}

.contact-intro p:last-child { max-width: 400px; }

.contact-form {
  background: var(--paper-alt);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 32px;
}

.hp-field {
  position: absolute;
  left: -9999px;
  width: 1px;
  height: 1px;
  opacity: 0;
}

.form-row { margin-bottom: 18px; }

.form-row label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 6px;
}

.form-row input,
.form-row textarea {
  width: 100%;
  font-family: inherit;
  font-size: 0.95rem;
  padding: 11px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
  color: var(--ink);
  resize: vertical;
}

.form-row input:focus,
.form-row textarea:focus {
  outline: none;
  border-color: var(--accent);
}

.form-note {
  margin: 14px 0 0;
  font-size: 0.9rem;
  color: var(--accent);
}

/* Footer */

.site-footer {
  border-top: 1px solid var(--line);
  padding: 28px 0;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--ink-soft);
}

.footer-inner a { color: var(--ink-soft); }

/* Responsive */

@media (max-width: 800px) {
  .problem-grid { grid-template-columns: 1fr; gap: 28px; }
  .about-grid,
  .contact-grid { grid-template-columns: 1fr; }
  .phase { grid-template-columns: 40px 1fr; gap: 16px; }
  .site-header nav { gap: 16px; }
  .site-header nav a:not(.nav-cta) { display: none; }
  .hero { padding: 64px 0 48px; }
  .how, .about, .contact { padding: 56px 0; }
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #ece9e2;
    --ink-soft: #a8a79f;
    --paper: #14171c;
    --paper-alt: #1a1e24;
    --line: #2a2e35;
    --accent: #6fbfa0;
    --accent-soft: #1e2b26;
    --header-bg: rgba(20, 23, 28, 0.88);
  }
  .btn-primary { color: #0c1210; }
  .nav-cta:hover { color: #0c1210 !important; }
}