:root {
  --cc-cyan: #1ab6f5;
  --cc-cyan-soft: #6fd4fa;
  --cc-blue-deep: #0b5c9e;
  --cc-ink: #16222e;
  --cc-ink-soft: #4a5b68;
  --cc-paper: #f7fafc;
  --cc-paper-raised: #ffffff;
  --cc-accent-warm: #ff7a33;
  --cc-accent-warm-dark: #e2611d;
  --cc-line: #d8e4ed;

  --font-display: "Space Grotesk", "Inter", sans-serif;
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;

  --max-width: 1180px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 28px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--cc-ink);
  background: var(--cc-paper);
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: inherit;
}

.wrap {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 32px;
}

/* ---------- Header ---------- */

.site-header {
  background: rgba(247, 250, 252, 0.92);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid var(--cc-line);
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 84px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}

.brand img {
  height: 38px;
  width: auto;
}

.main-nav {
  display: flex;
  gap: 40px;
}

.main-nav a {
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--cc-ink-soft);
  position: relative;
  padding-bottom: 4px;
  transition: color 0.2s ease;
}

.main-nav a:hover {
  color: var(--cc-blue-deep);
}

.main-nav a.active {
  color: var(--cc-accent-warm);
}

.main-nav a.active::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -2px;
  height: 2px;
  background: var(--cc-accent-warm);
  border-radius: 2px;
}

/* ---------- Signal thread (signature element) ---------- */

.signal-thread {
  position: relative;
  height: 64px;
  margin: 0 auto;
  max-width: var(--max-width);
}

.signal-thread svg {
  width: 100%;
  height: 100%;
  display: block;
}

/* ---------- Hero ---------- */

.hero {
  padding: 88px 0 96px;
}

.hero .wrap {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 56px;
  align-items: center;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--cc-blue-deep);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 18px;
}

.eyebrow::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--cc-accent-warm);
  display: inline-block;
}

h1 {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 4.2vw, 3.4rem);
  line-height: 1.08;
  letter-spacing: -0.01em;
  margin: 0 0 22px;
  color: var(--cc-ink);
}

h1 .accent {
  background: linear-gradient(100deg, var(--cc-blue-deep), var(--cc-cyan));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.lede {
  font-size: 1.15rem;
  line-height: 1.6;
  color: var(--cc-ink-soft);
  max-width: 46ch;
  margin: 0 0 32px;
}

.cta-row {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.btn {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 14px 28px;
  border-radius: 999px;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: transform 0.18s ease, box-shadow 0.18s ease;
  border: 1px solid transparent;
}

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

.btn-primary {
  background: var(--cc-accent-warm);
  color: #fff;
  box-shadow: 0 8px 20px -8px rgba(255, 122, 51, 0.6);
}

.btn-primary:hover {
  background: var(--cc-accent-warm-dark);
}

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

.btn-ghost:hover {
  border-color: var(--cc-blue-deep);
}

/* Hero diagram */

.hero-diagram {
  position: relative;
}

.hero-diagram svg {
  width: 100%;
  height: auto;
  display: block;
}

.node-pulse {
  animation: pulse 2.6s ease-in-out infinite;
  transform-origin: center;
}

.node-pulse.d1 { animation-delay: 0s; }
.node-pulse.d2 { animation-delay: 0.5s; }
.node-pulse.d3 { animation-delay: 1s; }
.node-pulse.d4 { animation-delay: 1.5s; }

@keyframes pulse {
  0%, 100% { opacity: 0.55; }
  50% { opacity: 1; }
}

@media (prefers-reduced-motion: reduce) {
  .node-pulse { animation: none; }
  html { scroll-behavior: auto; }
}

/* ---------- Sections ---------- */

section {
  padding: 88px 0;
}

.section-tight {
  padding: 56px 0;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 2.6vw, 2.2rem);
  letter-spacing: -0.01em;
  margin: 0 0 36px;
  color: var(--cc-ink);
}

.panel {
  background: var(--cc-paper-raised);
  border: 1px solid var(--cc-line);
  border-radius: var(--radius-lg);
}

/* Why choose - feature grid */

.feature-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.feature-card {
  background: var(--cc-paper-raised);
  border: 1px solid var(--cc-line);
  border-radius: var(--radius-md);
  padding: 28px;
  position: relative;
}

.feature-card .num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--cc-cyan);
  letter-spacing: 0.08em;
  display: block;
  margin-bottom: 12px;
}

.feature-card h3 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  margin: 0 0 10px;
}

.feature-card p {
  margin: 0;
  color: var(--cc-ink-soft);
  line-height: 1.55;
  font-size: 0.96rem;
}

/* Three-up benefit columns */

.benefit-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.benefit {
  border-top: 3px solid var(--cc-accent-warm);
  padding-top: 22px;
}

.benefit h3 {
  font-family: var(--font-mono);
  font-size: 0.92rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--cc-blue-deep);
  margin: 0 0 12px;
  line-height: 1.4;
}

.benefit p {
  color: var(--cc-ink-soft);
  line-height: 1.6;
  margin: 0;
  font-size: 0.97rem;
}

/* CTA banner */

.cta-banner {
  background: linear-gradient(120deg, var(--cc-blue-deep), #0e3a63 70%);
  border-radius: var(--radius-lg);
  padding: 56px;
  color: #fff;
  display: grid;
  grid-template-columns: 1.3fr auto;
  align-items: center;
  gap: 32px;
  position: relative;
  overflow: hidden;
}

.cta-banner::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 85% 20%, rgba(26, 182, 245, 0.35), transparent 55%);
  pointer-events: none;
}

.cta-banner h2 {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 2.4vw, 2rem);
  margin: 0 0 10px;
  position: relative;
}

.cta-banner p {
  margin: 0;
  color: #cfe3f4;
  position: relative;
  max-width: 46ch;
}

.cta-banner .btn-primary {
  position: relative;
  white-space: nowrap;
}

/* About page specifics */

.about-intro {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  border: 1px dashed var(--cc-line);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.about-intro .copy {
  padding: 44px;
  display: flex;
  align-items: center;
}

.about-intro .copy p {
  font-size: 1.05rem;
  line-height: 1.65;
  color: var(--cc-ink);
  margin: 0;
}

.about-intro .label-block {
  padding: 44px;
  border-left: 1px dashed var(--cc-line);
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.about-intro .label-block .eyebrow {
  margin-bottom: 14px;
}

.about-intro .label-block .rule {
  width: 64px;
  height: 3px;
  background: var(--cc-accent-warm);
  border-radius: 2px;
}

.about-diagram-feature {
  margin-top: 64px;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, #0b2540, #0e3a63 60%, #0b5c9e);
  padding: 64px;
  text-align: center;
  color: #fff;
  position: relative;
  overflow: hidden;
}

.about-diagram-feature svg {
  width: 100%;
  max-width: 520px;
  height: auto;
  margin: 0 auto 28px;
  display: block;
}

.about-diagram-feature .division-line {
  font-family: var(--font-mono);
  font-size: 13px;
  color: #cfe3f4;
  letter-spacing: 0.04em;
}

.about-diagram-feature .division-line .hl {
  color: var(--cc-cyan-soft);
  font-weight: 600;
}

/* Contact page */

.contact-grid {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--cc-line);
}

.contact-info {
  background: var(--cc-blue-deep);
  background: linear-gradient(160deg, #0b5c9e, #0e3a63);
  color: #fff;
  padding: 48px 40px;
}

.contact-info .info-block {
  margin-bottom: 36px;
}

.contact-info .info-block:last-child {
  margin-bottom: 0;
}

.contact-info h3 {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--cc-accent-warm);
  margin: 0 0 12px;
}

.contact-info .rule {
  width: 40px;
  height: 2px;
  background: rgba(255, 255, 255, 0.25);
  margin-bottom: 16px;
  border-radius: 2px;
}

.contact-info p {
  margin: 0;
  line-height: 1.6;
  color: #dcebf6;
}

.contact-info a.tel {
  color: #fff;
  text-decoration: none;
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 600;
}

.contact-form {
  background: var(--cc-paper-raised);
  padding: 48px 40px;
}

.field {
  margin-bottom: 22px;
}

.field label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  color: var(--cc-ink-soft);
  margin-bottom: 8px;
}

.field label .req {
  color: var(--cc-accent-warm);
}

.field input,
.field textarea {
  width: 100%;
  font-family: var(--font-body);
  font-size: 0.98rem;
  padding: 13px 15px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--cc-line);
  background: var(--cc-paper);
  color: var(--cc-ink);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.field input:focus,
.field textarea:focus {
  outline: none;
  border-color: var(--cc-cyan);
  box-shadow: 0 0 0 3px rgba(26, 182, 245, 0.18);
}

.field textarea {
  min-height: 140px;
  resize: vertical;
}

.form-footnote {
  font-size: 0.85rem;
  color: var(--cc-ink-soft);
  margin: 18px 0 0;
}

.form-footnote a {
  color: var(--cc-blue-deep);
  text-decoration: underline;
}

.form-note {
  font-size: 0.82rem;
  color: var(--cc-ink-soft);
  margin-top: 14px;
}

.form-status {
  margin-top: 16px;
  font-size: 0.9rem;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  display: none;
}

.form-status.success {
  display: block;
  background: #e6f7ee;
  color: #1c7a4c;
  border: 1px solid #bce8d2;
}

.form-status.error {
  display: block;
  background: #fdeceb;
  color: #b3361f;
  border: 1px solid #f6c5bd;
}

/* ---------- Footer ---------- */

.site-footer {
  border-top: 1px solid var(--cc-line);
  padding: 36px 0;
  margin-top: 40px;
}

.site-footer .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--cc-ink-soft);
}

.footer-brand img {
  height: 20px;
  width: auto;
  opacity: 0.85;
}

.footer-brand .hl {
  color: var(--cc-blue-deep);
  font-weight: 600;
}

.footer-links {
  display: flex;
  gap: 24px;
  font-size: 0.85rem;
}

.footer-links a {
  text-decoration: none;
  color: var(--cc-ink-soft);
}

.footer-links a:hover {
  color: var(--cc-blue-deep);
}

/* ---------- Responsive ---------- */

@media (max-width: 880px) {
  .hero .wrap {
    grid-template-columns: 1fr;
  }

  .hero-diagram {
    order: -1;
  }

  .feature-grid {
    grid-template-columns: 1fr;
  }

  .benefit-row {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .cta-banner {
    grid-template-columns: 1fr;
    text-align: left;
    padding: 40px 28px;
  }

  .about-intro {
    grid-template-columns: 1fr;
  }

  .about-intro .label-block {
    border-left: none;
    border-top: 1px dashed var(--cc-line);
  }

  .contact-grid {
    grid-template-columns: 1fr;
  }

  .main-nav {
    gap: 22px;
  }

  section {
    padding: 56px 0;
  }
}

@media (max-width: 540px) {
  .wrap {
    padding: 0 20px;
  }

  .site-header .wrap {
    height: 72px;
  }

  .brand img {
    height: 30px;
  }

  .about-diagram-feature {
    padding: 36px 24px;
  }

  .contact-info,
  .contact-form {
    padding: 32px 24px;
  }
}