/* ==========================================================================
   Clarity Signal — Design tokens
   Concept: "signal" — a noisy line resolving into a clean one. Every part
   of the visual language (waveform motif, mono numerals, sharp accent
   blue) is drawn from that idea rather than generic SaaS defaults.
   ========================================================================== */

:root {
  /* Palette */
  --canvas: #F3F4F1;
  --canvas-alt: #E9EAE4;
  --ink: #10161C;
  --ink-soft: #4B5563;
  --ink-faint: #8A9099;
  --line: rgba(16, 22, 28, 0.12);
  --line-strong: rgba(16, 22, 28, 0.22);

  --signal: #2F5FED;
  --signal-dark: #1E43B8;
  --signal-tint: #E7ECFD;

  --amber: #F2A93B;
  --green: #1F9D6B;

  --ink-bg: #10161C;
  --ink-bg-alt: #182230;
  --on-ink: #F3F4F1;
  --on-ink-soft: #A9B2BC;
  --on-ink-line: rgba(243, 244, 241, 0.14);

  /* Type */
  --font-display: "Space Grotesk", "Helvetica Neue", Arial, sans-serif;
  --font-body: "IBM Plex Sans", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "IBM Plex Mono", "SFMono-Regular", Menlo, monospace;

  /* Layout */
  --max: 1180px;
  --gutter: clamp(1.25rem, 4vw, 3rem);
  --radius: 3px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--canvas);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.1;
  margin: 0 0 0.5em;
  letter-spacing: -0.01em;
}

p { margin: 0 0 1.2em; }
.container { max-width: var(--max); margin: 0 auto; padding: 0 var(--gutter); }

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--signal);
  display: inline-flex;
  align-items: center;
  gap: 0.6em;
  margin-bottom: 1em;
}
.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: var(--signal);
  display: inline-block;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0.85em 1.6em;
  border-radius: var(--radius);
  border: 1px solid transparent;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.15s ease, background 0.15s ease, border-color 0.15s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: var(--signal); color: #fff; }
.btn-primary:hover { background: var(--signal-dark); }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--line-strong); }
.btn-ghost:hover { border-color: var(--ink); }
.btn-on-ink { background: var(--on-ink); color: var(--ink-bg); }
.btn-on-ink:hover { background: var(--signal); color: #fff; }

/* ---------- Site header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(243, 244, 241, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}
.site-logo {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  text-decoration: none;
  color: var(--ink);
  display: flex;
  align-items: center;
  gap: 0.5em;
}
.site-logo .mark { color: var(--signal); }
.primary-nav ul {
  list-style: none;
  display: flex;
  gap: 2.2rem;
  margin: 0;
  padding: 0;
}
.primary-nav a {
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--ink-soft);
}
.primary-nav a:hover, .primary-nav a.current { color: var(--ink); }
.header-actions { display: flex; align-items: center; gap: 1.2rem; }
.nav-toggle { display: none; background: none; border: none; cursor: pointer; }

@media (max-width: 860px) {
  .primary-nav { display: none; }
  .nav-toggle { display: block; }
  .primary-nav.is-open {
    display: block;
    position: absolute;
    top: 76px; left: 0; right: 0;
    background: var(--canvas);
    border-bottom: 1px solid var(--line);
    padding: 1rem var(--gutter) 2rem;
  }
  .primary-nav.is-open ul { flex-direction: column; gap: 1rem; }
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding: clamp(4rem, 10vw, 7.5rem) 0 clamp(3rem, 8vw, 5rem);
  overflow: hidden;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 3rem;
  align-items: center;
}
@media (max-width: 900px) { .hero-grid { grid-template-columns: 1fr; } }

.hero h1 {
  font-size: clamp(2.4rem, 5vw, 3.6rem);
  max-width: 14ch;
}
.hero h1 .fade { color: var(--ink-faint); }
.hero h1 .accent { color: var(--signal); }
.hero .lede {
  font-size: 1.15rem;
  color: var(--ink-soft);
  max-width: 46ch;
  margin: 1.2em 0 1.8em;
}
.hero-actions { display: flex; gap: 1rem; flex-wrap: wrap; }

.signal-figure { width: 100%; height: auto; }
.signal-figure .noisy { stroke: var(--ink-faint); }
.signal-figure .clean { stroke: var(--signal); }
.signal-figure .baseline { stroke: var(--line); }

/* ---------- Section rhythm ---------- */
section { padding: clamp(3.5rem, 8vw, 6rem) 0; }
.section-border-top { border-top: 1px solid var(--line); }
.section-head { max-width: 640px; margin-bottom: 3rem; }
.section-head h2 { font-size: clamp(1.7rem, 3vw, 2.3rem); }
.section-head p { color: var(--ink-soft); font-size: 1.05rem; }

/* Positioning statement (on ink) */
.positioning { background: var(--ink-bg); color: var(--on-ink); }
.positioning .container { max-width: 880px; }
.positioning .eyebrow { color: var(--amber); }
.positioning .eyebrow::before { background: var(--amber); }
.positioning h2 {
  font-size: clamp(1.6rem, 3.4vw, 2.4rem);
  font-weight: 500;
  line-height: 1.35;
}
.positioning h2 strong { color: var(--on-ink); font-weight: 700; }
.positioning p.body { color: var(--on-ink-soft); font-size: 1.05rem; max-width: 62ch; }

/* ---------- Process (real 7-step sequence — numbering earns its place) ---------- */
.process-list { display: grid; gap: 0; border-top: 1px solid var(--line); }
.process-item {
  display: grid;
  grid-template-columns: 90px 1fr;
  gap: 1.5rem;
  padding: 1.6rem 0;
  border-bottom: 1px solid var(--line);
  align-items: baseline;
}
.process-item .num {
  font-family: var(--font-mono);
  color: var(--signal);
  font-size: 1rem;
}
.process-item h3 { font-size: 1.15rem; margin-bottom: 0.3em; }
.process-item p { color: var(--ink-soft); margin: 0; max-width: 55ch; }

/* ---------- Card grids ---------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
}
.card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 2rem;
}
.card .tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--ink-faint);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.card h3 { font-size: 1.15rem; margin: 0.5em 0 0.5em; }
.card p { color: var(--ink-soft); font-size: 0.98rem; margin: 0; }

/* ---------- Newsletter ---------- */
.newsletter {
  background: var(--signal-tint);
  border-radius: var(--radius);
  padding: clamp(2rem, 5vw, 3.5rem);
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 2rem;
  align-items: center;
}
@media (max-width: 760px) { .newsletter { grid-template-columns: 1fr; } }
.newsletter h2 { font-size: 1.5rem; margin-bottom: 0.4em; }
.newsletter p { color: var(--ink-soft); margin: 0; }
.newsletter-form { display: flex; gap: 0.6rem; flex-wrap: wrap; }
.newsletter-form input[type="email"] {
  flex: 1;
  min-width: 200px;
  padding: 0.85em 1em;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-size: 0.95rem;
  background: #fff;
}
.newsletter-note {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--ink-faint);
  margin-top: 0.8em;
}

/* ---------- Forms (contact / inquiry) ---------- */
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1.2rem; }
@media (max-width: 700px) { .form-grid { grid-template-columns: 1fr; } }
.form-field { display: flex; flex-direction: column; gap: 0.4rem; }
.form-field.full { grid-column: 1 / -1; }
.form-field label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--ink-soft);
}
.form-field input, .form-field textarea, .form-field select {
  padding: 0.8em 1em;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-size: 0.98rem;
  background: #fff;
  color: var(--ink);
}
.form-field textarea { resize: vertical; min-height: 130px; }
.form-status { font-size: 0.9rem; margin-top: 1rem; }

/* ---------- Blog ---------- */
.post-grid { display: grid; gap: 2.5rem; }
.post-card { display: grid; grid-template-columns: 1px 1fr; gap: 1.5rem; }
.post-card .rule { background: var(--line); }
.post-meta {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--ink-faint);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 0.6em;
}
.post-card h2 { font-size: 1.4rem; margin-bottom: 0.3em; }
.post-card h2 a { text-decoration: none; }
.post-card h2 a:hover { color: var(--signal); }
.post-card .excerpt { color: var(--ink-soft); }
.post-card .read-more {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--signal);
  text-decoration: none;
}

.single-post-header { max-width: 760px; margin: 0 auto 2.5rem; text-align: left; }
.single-post-header h1 { font-size: clamp(2rem, 4vw, 2.6rem); }
.entry-content { max-width: 760px; margin: 0 auto; font-size: 1.08rem; }
.entry-content h2 { margin-top: 1.6em; font-size: 1.5rem; }
.entry-content h3 { margin-top: 1.4em; font-size: 1.2rem; }
.entry-content p { margin-bottom: 1.3em; }
.entry-content img { border-radius: var(--radius); margin: 1.5em 0; }
.entry-content blockquote {
  border-left: 3px solid var(--signal);
  margin: 1.8em 0;
  padding: 0.2em 0 0.2em 1.2em;
  color: var(--ink-soft);
  font-style: italic;
}

.pagination { display: flex; gap: 1rem; justify-content: space-between; margin-top: 3rem; }
.pagination a {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  text-decoration: none;
  color: var(--signal);
}

/* ---------- Footer ---------- */
.site-footer { background: var(--ink-bg); color: var(--on-ink-soft); }
.site-footer .container { padding-top: 4rem; padding-bottom: 2.5rem; }
.footer-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr 1fr;
  gap: 2.5rem;
  border-bottom: 1px solid var(--on-ink-line);
  padding-bottom: 3rem;
  margin-bottom: 2rem;
}
@media (max-width: 760px) { .footer-grid { grid-template-columns: 1fr; } }
.site-footer .site-logo { color: var(--on-ink); }
.footer-tagline { max-width: 32ch; color: var(--on-ink-soft); }
.footer-col h4 {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--on-ink-soft);
  margin-bottom: 1em;
}
.footer-col ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.7em; }
.footer-col a { text-decoration: none; color: var(--on-ink); font-size: 0.95rem; }
.footer-col a:hover { color: var(--signal); }
.footer-bottom {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.85rem;
  font-family: var(--font-mono);
}

/* ---------- Utility ---------- */
.text-center { text-align: center; }
.mt-0 { margin-top: 0; }
.visually-hidden {
  position: absolute; width: 1px; height: 1px; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap;
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}