:root {
  --ink: #0A0A0A;
  --signal: #2563EB;
  --signal-hover: #1E4FBD;
  --paper: #FAFAF7;
  --stone: #6B7280;
  --stone-light: #A1A1AA;
  --border: #E5E7EB;
  --surface-2: #F0F0ED;
  --surface-3: #F5F5F2;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--signal);
  text-decoration: none;
}

nav {
  background: var(--ink);
  padding: 14px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 100;
}

.logo {
  font-weight: 900;
  font-size: 18px;
  color: var(--paper);
  letter-spacing: -0.5px;
}
.logo span { color: var(--signal); }

.nav-links {
  display: flex;
  gap: 20px;
  align-items: center;
}
.nav-links a {
  color: var(--paper);
  font-size: 13px;
  opacity: 0.75;
  font-weight: 500;
}
.nav-links a:hover { opacity: 1; }
.nav-links a.active { color: var(--signal); opacity: 1; font-weight: 600; }

.btn {
  background: var(--signal);
  color: #FFFFFF;
  padding: 10px 20px;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  display: inline-block;
}
.btn:hover { background: var(--signal-hover); }

.btn-outline {
  background: transparent;
  border: 1px solid #3F3F46;
  color: var(--paper);
  padding: 10px 20px;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 500;
  display: inline-block;
}
.btn-outline:hover { border-color: var(--paper); }

.hero-dark {
  background: var(--ink);
  padding: 88px 32px;
  text-align: center;
}
.eyebrow {
  font-size: 11px;
  letter-spacing: 4px;
  color: var(--signal);
  margin-bottom: 22px;
  font-weight: 500;
  text-transform: uppercase;
}
.eyebrow-light {
  font-size: 11px;
  letter-spacing: 4px;
  color: var(--stone);
  margin-bottom: 18px;
  font-weight: 500;
  text-transform: uppercase;
}
.hero-dark h1 {
  font-size: 64px;
  font-weight: 800;
  line-height: 1;
  color: var(--paper);
  margin-bottom: 28px;
  letter-spacing: -3px;
}
.hero-dark p {
  font-size: 16px;
  line-height: 1.6;
  color: var(--stone-light);
  margin: 0 auto 36px;
  max-width: 480px;
}
.hero-buttons {
  display: flex;
  gap: 10px;
  justify-content: center;
  flex-wrap: wrap;
}

section {
  padding: 56px 32px;
}
.container {
  max-width: 640px;
  margin: 0 auto;
}
.container-narrow {
  max-width: 560px;
  margin: 0 auto;
}

.section-light { background: var(--paper); }
.section-surface { background: var(--surface-2); }
.section-dark { background: var(--ink); color: var(--paper); }

.section-title {
  font-size: 28px;
  font-weight: 700;
  color: var(--ink);
  line-height: 1.3;
  letter-spacing: -0.5px;
  margin-bottom: 16px;
}
.section-title-center { text-align: center; }
.section-sub {
  font-size: 15px;
  line-height: 1.7;
  color: var(--stone);
}
.section-sub-center { text-align: center; }

.section-title-light {
  font-size: 32px;
  font-weight: 800;
  color: var(--paper);
  letter-spacing: -1px;
  margin-bottom: 16px;
  text-align: center;
}
.section-sub-light {
  font-size: 14px;
  color: var(--stone-light);
  line-height: 1.6;
  text-align: center;
  max-width: 460px;
  margin: 0 auto 24px;
}

.how-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 20px;
}
.how-num {
  font-size: 32px;
  font-weight: 900;
  color: var(--signal);
  margin-bottom: 8px;
  letter-spacing: -1px;
}
.how-t {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 8px;
}
.how-d {
  font-size: 13px;
  line-height: 1.6;
  color: var(--stone);
}

.service-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.why-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 14px;
}

.industry-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 10px;
}
.industry-item {
  background: #FFFFFF;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px 16px;
  transition: border-color 0.15s ease;
}
.industry-item:hover {
  border-color: var(--signal);
}
.industry-t {
  font-size: 13px;
  font-weight: 600;
  color: var(--ink);
  line-height: 1.4;
}
.service-card {
  background: #FFFFFF;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 18px;
}
.service-card h3 {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 6px;
}
.service-card p {
  font-size: 13px;
  line-height: 1.6;
  color: var(--stone);
}

.cat {
  background: #FFFFFF;
  border: 1px solid var(--border);
  border-radius: 8px;
  margin-bottom: 10px;
  overflow: hidden;
}
.cat summary {
  padding: 16px 20px;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  list-style: none;
}
.cat summary::-webkit-details-marker { display: none; }
.cat summary::after {
  content: '+';
  font-size: 22px;
  color: var(--signal);
  font-weight: 400;
  line-height: 1;
}
.cat[open] summary::after { content: '\2212'; }
.cat[open] summary { border-bottom: 1px solid var(--border); }
.cat-t {
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
}
.cat-s {
  font-size: 11px;
  color: var(--signal);
  letter-spacing: 2px;
  font-weight: 600;
  display: block;
  margin-top: 3px;
}
.cat-body {
  padding: 14px 16px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}
.item {
  background: var(--paper);
  border-radius: 6px;
  padding: 12px 14px;
}
.it-t {
  font-size: 13px;
  font-weight: 700;
  margin-bottom: 3px;
}
.it-d {
  font-size: 12px;
  color: var(--stone);
  line-height: 1.5;
}

.audit-features {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin: 28px 0;
}
.audit-feature {
  background: #FFFFFF;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 18px;
}
.audit-feature .check {
  width: 20px;
  height: 20px;
  background: var(--signal);
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 700;
  font-size: 12px;
  margin-bottom: 10px;
}

.form-grid {
  display: grid;
  gap: 14px;
}
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.form-field label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 4px;
  letter-spacing: 0.5px;
}
.form-field input,
.form-field textarea,
.form-field select {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 14px;
  font-family: inherit;
  background: #FFFFFF;
}
.form-field input:focus,
.form-field textarea:focus,
.form-field select:focus {
  outline: none;
  border-color: var(--signal);
}
.form-field textarea {
  resize: vertical;
  min-height: 100px;
}

footer {
  background: var(--ink);
  padding: 28px 32px;
  border-top: 1px solid #1F1F23;
}
.footer-inner {
  max-width: 640px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}
.footer-logo {
  font-weight: 900;
  font-size: 16px;
  color: var(--paper);
}
.footer-logo span { color: var(--signal); }
.footer-meta {
  font-size: 12px;
  color: #71717A;
}
.footer-meta a { color: #71717A; margin-left: 10px; }
.footer-meta a:hover { color: var(--paper); }

.about-bio {
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink);
}
.about-bio p { margin-bottom: 20px; }
.about-sig {
  margin-top: 32px;
  font-size: 15px;
  color: var(--stone);
  font-style: italic;
}

.success-msg {
  padding: 16px;
  background: #ECFDF5;
  border: 1px solid #10B981;
  border-radius: 8px;
  color: #047857;
  font-size: 14px;
  margin-bottom: 20px;
  display: none;
}

.error-msg {
  padding: 16px;
  background: #FEF2F2;
  border: 1px solid #EF4444;
  border-radius: 8px;
  color: #991B1B;
  font-size: 14px;
  margin-bottom: 20px;
  display: none;
}

@media (max-width: 640px) {
  .hero-dark h1 { font-size: 44px; letter-spacing: -2px; }
  .section-title { font-size: 24px; }
  .how-grid { grid-template-columns: 1fr; }
  .service-grid { grid-template-columns: 1fr; }
  .why-grid { grid-template-columns: 1fr; }
  .industry-grid { grid-template-columns: 1fr 1fr; }
  .cat-body { grid-template-columns: 1fr; }
  .audit-features { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .nav-links { gap: 14px; }
  .nav-links a:not(.btn) { display: none; }
  section { padding: 48px 20px; }
  .hero-dark { padding: 64px 20px; }
}