/* ThreadClarity marketing — Signal design system */

:root {
  color-scheme: light;
  --paper: #F3F4F7;
  --paper-2: #EAECEF;
  --ink: #141820;
  --ink-soft: #4B5563;
  --ink-mute: #6B7280;
  --signal: #2554E6;
  --signal-deep: #1E3FAF;
  --signal-soft: #E8EEFF;
  --line: rgba(18, 22, 30, 0.10);
  --line-strong: rgba(18, 22, 30, 0.16);
  --white: #FFFFFF;
  --shadow: 0 18px 48px rgba(20, 24, 32, 0.10);
  --font-sans: 'Outfit', 'Segoe UI', sans-serif;
  --font-display: 'Fraunces', Georgia, serif;
  --radius: 14px;
  --shell: min(1120px, calc(100% - 2.5rem));
  --header-h: 72px;
}

*,
*::before,
*::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--ink);
  background:
    radial-gradient(1200px 500px at 70% -10%, rgba(37, 84, 230, 0.12), transparent 60%),
    linear-gradient(180deg, #EEF1F6 0%, var(--paper) 28%, var(--paper) 100%);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

img { display: block; max-width: 100%; }
a { color: var(--signal); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--signal-deep); }

.shell {
  width: var(--shell);
  margin-inline: auto;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--ink);
  color: var(--white);
  padding: 0.6rem 1rem;
  z-index: 100;
}
.skip-link:focus { left: 0.75rem; top: 0.75rem; }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(14px);
  background: rgba(243, 244, 247, 0.82);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  min-height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  color: inherit;
  text-decoration: none;
}

.brand-word {
  font-size: 1.15rem;
  font-weight: 650;
  letter-spacing: -0.02em;
}
.w-thread { color: var(--ink); }
.w-clarity { color: var(--signal); }

.header-nav {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}
.header-nav a:not(.btn) {
  color: var(--ink-soft);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
}
.header-nav a:not(.btn):hover { color: var(--ink); }

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--white);
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
}
.nav-toggle span {
  display: block;
  width: 16px;
  height: 2px;
  background: var(--ink);
}

.mobile-nav {
  display: none;
  flex-direction: column;
  gap: 0.85rem;
  padding: 0.5rem 1.25rem 1.25rem;
  border-top: 1px solid var(--line);
}
.mobile-nav a:not(.btn) {
  color: var(--ink);
  text-decoration: none;
  font-weight: 500;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  border-radius: 10px;
  border: 1px solid transparent;
  font-family: inherit;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: transform 0.18s ease, background 0.18s ease, border-color 0.18s ease, color 0.18s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn-sm { padding: 0.45rem 0.9rem; font-size: 0.9rem; }
.btn-lg { padding: 0.85rem 1.35rem; font-size: 1rem; }
.btn-primary {
  background: var(--signal);
  color: var(--white);
  box-shadow: 0 10px 24px rgba(37, 84, 230, 0.22);
}
.btn-primary:hover { background: var(--signal-deep); color: var(--white); }
.btn-ghost {
  background: rgba(255, 255, 255, 0.55);
  border-color: var(--line-strong);
  color: var(--ink);
}
.btn-ghost:hover { background: var(--white); color: var(--ink); }

/* Hero */
.hero {
  position: relative;
  min-height: calc(100svh - var(--header-h));
  display: grid;
  align-items: end;
  overflow: hidden;
  isolation: isolate;
}

.hero-plane {
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(120deg, rgba(243, 244, 247, 0.2) 0%, rgba(232, 238, 255, 0.55) 42%, rgba(37, 84, 230, 0.18) 100%),
    linear-gradient(180deg, #DDE4F5 0%, #F3F4F7 78%);
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(37, 84, 230, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(37, 84, 230, 0.06) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse at 70% 40%, #000 20%, transparent 72%);
  opacity: 0.7;
}

.hero-glow {
  position: absolute;
  width: min(70vw, 720px);
  height: min(70vw, 720px);
  right: -8%;
  top: 5%;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(37, 84, 230, 0.28), transparent 68%);
  animation: pulse-glow 7s ease-in-out infinite;
}

.hero-thread-art {
  position: absolute;
  inset: 8% 0 0;
  color: var(--signal);
  opacity: 0.9;
}

.hero-thread-art svg {
  width: 100%;
  height: 100%;
}

.thread-path {
  stroke-dasharray: 1400;
  stroke-dashoffset: 1400;
  animation: draw-thread 2.4s ease forwards 0.2s;
}
.thread-path.b { animation-delay: 0.55s; }
.thread-node {
  opacity: 0;
  animation: node-in 0.6s ease forwards 1.5s;
}
.thread-node.mid { animation-delay: 1.75s; }

.hero-copy {
  padding: clamp(3rem, 10vh, 6.5rem) 0 clamp(3.5rem, 9vh, 6rem);
  max-width: 40rem;
  animation: rise-in 0.8s ease both;
}

.hero-brand {
  margin: 0 0 0.85rem;
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 5.5vw, 3.8rem);
  font-weight: 650;
  letter-spacing: -0.035em;
  line-height: 1.05;
  color: var(--ink);
}

.hero-title {
  margin: 0 0 1rem;
  font-size: clamp(1.35rem, 2.6vw, 1.85rem);
  font-weight: 550;
  letter-spacing: -0.02em;
  line-height: 1.25;
  color: var(--ink-soft);
  max-width: 28ch;
}

.hero-lede {
  margin: 0 0 1.75rem;
  color: var(--ink-mute);
  font-size: 1.05rem;
  max-width: 40ch;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* Sections */
.section {
  padding: clamp(3.5rem, 8vw, 5.5rem) 0;
}

.section-alt {
  background: rgba(255, 255, 255, 0.45);
  border-block: 1px solid var(--line);
}

.section-head {
  max-width: 36rem;
  margin-bottom: 2.25rem;
}
.section-head h2 {
  margin: 0 0 0.55rem;
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3.2vw, 2.4rem);
  letter-spacing: -0.03em;
  line-height: 1.15;
}
.section-head p {
  margin: 0;
  color: var(--ink-mute);
  font-size: 1.05rem;
}

.proof-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  padding: 1.25rem 0 0;
}
.proof-row p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.98rem;
}
.proof-row strong {
  color: var(--ink);
  font-weight: 650;
}

.scorecard-section {
  padding-top: clamp(2.5rem, 5vw, 3.5rem);
  padding-bottom: clamp(2.5rem, 5vw, 3.5rem);
}
.scorecard-head {
  margin-bottom: 1.75rem;
}
.scorecard-head h2 {
  font-size: clamp(1.55rem, 2.8vw, 2rem);
}

.stats-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  padding: 0.5rem 0 1rem;
  border-bottom: 1px solid var(--line);
}
.stats-strip[hidden] {
  display: none;
}
.stat {
  text-align: left;
  padding: 0.5rem 0 0.85rem;
  border-top: 2px solid var(--signal);
}
.stat-value {
  margin: 0.65rem 0 0;
  font-family: var(--font-display);
  font-size: clamp(2.35rem, 5vw, 3.35rem);
  font-weight: 600;
  letter-spacing: -0.035em;
  color: var(--signal);
  line-height: 1.02;
  font-variant-numeric: tabular-nums;
}
.stat-label {
  margin: 0.45rem 0 0;
  color: var(--ink-mute);
  font-size: 0.95rem;
  font-weight: 500;
}

.stats-ticker {
  margin: 0.85rem 0 0.35rem;
  min-height: 1.5rem;
  overflow: hidden;
}
.stats-ticker[hidden] {
  display: none;
}
.ticker-line {
  margin: 0;
  color: var(--ink-mute);
  font-size: 0.92rem;
  letter-spacing: 0.01em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.45s ease, transform 0.45s ease;
}
.ticker-line.is-leaving {
  opacity: 0;
  transform: translateY(-0.35rem);
}
.ticker-line.is-entering {
  opacity: 0;
  transform: translateY(0.35rem);
}

@media (prefers-reduced-motion: reduce) {
  .ticker-line,
  .ticker-line.is-leaving,
  .ticker-line.is-entering {
    transition: none;
    transform: none;
    opacity: 1;
  }
}

.steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}
.steps li {
  padding-top: 1rem;
  border-top: 2px solid var(--signal);
}
.step-num {
  display: block;
  font-family: var(--font-display);
  color: var(--signal);
  font-size: 0.95rem;
  margin-bottom: 0.65rem;
}
.steps h3 {
  margin: 0 0 0.45rem;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
}
.steps p {
  margin: 0;
  color: var(--ink-mute);
  font-size: 0.95rem;
}

.feature-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.75rem 2.5rem;
}
.feature-list article {
  padding: 0;
  border: 0;
  background: transparent;
}
.feature-list h3 {
  margin: 0 0 0.4rem;
  font-size: 1.12rem;
  letter-spacing: -0.015em;
}
.feature-list p {
  margin: 0;
  color: var(--ink-mute);
}

.showcase-stage {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 1rem;
  align-items: stretch;
  margin-bottom: 1.5rem;
}

.showcase-panel {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.1rem 1.2rem;
  box-shadow: var(--shadow);
  min-height: 220px;
}

.panel-label {
  display: inline-block;
  margin-bottom: 1rem;
  font-size: 0.78rem;
  font-weight: 650;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-mute);
}

.msg-stack {
  display: grid;
  gap: 0.55rem;
}
.msg-stack span {
  display: block;
  height: 12px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--paper-2), #d5dbe6);
}
.msg-stack span:nth-child(1) { width: 92%; }
.msg-stack span:nth-child(2) { width: 74%; }
.msg-stack span:nth-child(3) { width: 86%; }
.msg-stack span:nth-child(4) { width: 61%; }
.msg-stack span:nth-child(5) { width: 78%; }

.showcase-panel.threads ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.7rem;
}
.showcase-panel.threads li {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding-bottom: 0.65rem;
  border-bottom: 1px solid var(--line);
}
.showcase-panel.threads li:last-child { border-bottom: 0; padding-bottom: 0; }
.showcase-panel.threads em {
  font-style: normal;
  font-weight: 600;
  color: var(--ink);
}
.showcase-panel.threads small { color: var(--ink-mute); }

.showcase-arrow {
  align-self: center;
  color: var(--signal);
  font-size: 1.5rem;
  font-weight: 600;
}

.chip-row {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
}
.chip-row li {
  padding: 0.35rem 0.7rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.7);
  color: var(--ink-soft);
  font-size: 0.88rem;
  font-weight: 500;
}

.faq {
  display: grid;
  gap: 0.75rem;
  max-width: 44rem;
}
.faq details {
  border-bottom: 1px solid var(--line);
  padding: 0.85rem 0;
}
.faq summary {
  cursor: pointer;
  font-weight: 600;
  list-style: none;
  color: var(--ink);
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: '+';
  float: right;
  color: var(--signal);
  font-weight: 500;
}
.faq details[open] summary::after { content: '–'; }
.faq p {
  margin: 0.7rem 0 0.2rem;
  color: var(--ink-mute);
}

.access {
  background:
    radial-gradient(700px 280px at 20% 0%, rgba(37, 84, 230, 0.14), transparent 70%),
    linear-gradient(180deg, rgba(232, 238, 255, 0.55), transparent);
}

.access-inner { max-width: 34rem; }

.access-form {
  display: grid;
  gap: 0.75rem;
  margin-bottom: 1rem;
}
.access-form input[type="email"] {
  width: 100%;
  padding: 0.95rem 1rem;
  border-radius: 10px;
  border: 1px solid var(--line-strong);
  background: var(--white);
  font: inherit;
  color: var(--ink);
}
.access-form input:focus {
  outline: 2px solid rgba(37, 84, 230, 0.35);
  outline-offset: 1px;
  border-color: var(--signal);
}
.form-status {
  min-height: 1.25rem;
  margin: 0;
  font-size: 0.95rem;
  color: var(--ink-soft);
}
.form-status.is-error { color: #D14343; }
.form-status.is-ok { color: #1B7F5A; }
.access-alt {
  margin: 0;
  color: var(--ink-mute);
}

.consent-line {
  display: flex;
  align-items: flex-start;
  gap: 0.65rem;
  font-size: 0.92rem;
  color: var(--ink-soft);
  line-height: 1.45;
}
.consent-line input {
  margin-top: 0.2rem;
  flex-shrink: 0;
}
.consent-line a {
  color: var(--signal);
}

.legal-page {
  padding: clamp(2.5rem, 6vw, 4rem) 0 clamp(3rem, 8vw, 5rem);
}
.legal-shell {
  max-width: 44rem;
}
.legal-kicker {
  margin: 0 0 0.5rem;
  font-size: 0.8rem;
  font-weight: 650;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--signal);
}
.legal-page h1 {
  margin: 0 0 0.5rem;
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 2.8rem);
  letter-spacing: -0.03em;
  line-height: 1.1;
}
.legal-meta {
  margin: 0 0 2rem;
  color: var(--ink-mute);
  font-size: 0.95rem;
}
.legal-page section {
  margin-bottom: 1.6rem;
}
.legal-page h2 {
  margin: 0 0 0.55rem;
  font-size: 1.15rem;
  letter-spacing: -0.015em;
}
.legal-page p,
.legal-page li {
  color: var(--ink-soft);
  line-height: 1.65;
}
.legal-page ul {
  padding-left: 1.2rem;
}
.legal-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  margin-top: 2.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--line);
}
.legal-nav a {
  color: var(--ink-soft);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.92rem;
}
.legal-nav a:hover { color: var(--ink); }

.site-footer {
  border-top: 1px solid var(--line);
  padding: 2rem 0 2.5rem;
  background: rgba(255, 255, 255, 0.4);
}
.footer-inner {
  display: grid;
  gap: 1rem;
}
.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}
.footer-links a {
  color: var(--ink-soft);
  text-decoration: none;
  font-weight: 500;
}
.footer-links a:hover { color: var(--ink); }
.footer-note {
  margin: 0;
  color: var(--ink-mute);
  font-size: 0.9rem;
}

@keyframes draw-thread {
  to { stroke-dashoffset: 0; }
}
@keyframes node-in {
  from { opacity: 0; transform: scale(0.6); }
  to { opacity: 1; transform: scale(1); }
}
@keyframes pulse-glow {
  0%, 100% { transform: scale(1); opacity: 0.85; }
  50% { transform: scale(1.06); opacity: 1; }
}
@keyframes rise-in {
  from { opacity: 0; transform: translateY(18px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .thread-path,
  .thread-node,
  .hero-glow,
  .hero-copy,
  .btn { animation: none !important; transition: none !important; }
  .thread-path { stroke-dashoffset: 0; }
  .thread-node { opacity: 1; }
}

@media (max-width: 900px) {
  .header-nav { display: none; }
  .nav-toggle { display: inline-flex; }
  .mobile-nav.is-open { display: flex; }
  .steps { grid-template-columns: 1fr 1fr; }
  .proof-row { grid-template-columns: 1fr; gap: 0.55rem; }
  .stats-strip { grid-template-columns: 1fr; gap: 0.75rem; }
  .stat { padding-bottom: 0.35rem; }
  .ticker-line { white-space: normal; }
  .showcase-stage { grid-template-columns: 1fr; }
  .showcase-arrow { transform: rotate(90deg); justify-self: center; }
}

@media (max-width: 640px) {
  :root { --shell: min(1120px, calc(100% - 1.5rem)); }
  .feature-list { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; }
  .hero-brand { font-size: clamp(2.1rem, 10vw, 2.8rem); }
}

/* ── CCI extensions (Phase 6 content on Signal chrome) ── */
.hero-kicker {
  margin: 0 0 0.75rem;
  font-size: 0.78rem;
  font-weight: 650;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--signal);
}

.lane-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1rem;
}
.lane {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.25rem 1.2rem;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  min-height: 100%;
}
.lane.is-featured {
  border-color: rgba(37, 84, 230, 0.35);
  box-shadow: 0 14px 36px rgba(37, 84, 230, 0.12);
}
.lane h3 {
  margin: 0;
  font-size: 1.05rem;
  letter-spacing: -0.015em;
}
.lane .lane-meta {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.35rem;
  color: var(--signal);
  letter-spacing: -0.02em;
}
.lane p {
  margin: 0;
  color: var(--ink-mute);
  font-size: 0.92rem;
  flex: 1;
}
.lane ul {
  margin: 0;
  padding-left: 1.1rem;
  color: var(--ink-soft);
  font-size: 0.9rem;
  display: grid;
  gap: 0.35rem;
}
.lane .btn { align-self: flex-start; margin-top: 0.35rem; }

.uc-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.25rem;
}
.uc-card {
  border-top: 2px solid var(--signal);
  padding-top: 1rem;
}
.uc-who {
  font-size: 0.78rem;
  font-weight: 650;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--signal);
  margin-bottom: 0.45rem;
}
.uc-card h3 {
  margin: 0 0 0.5rem;
  font-size: 1.08rem;
  letter-spacing: -0.015em;
  line-height: 1.3;
}
.uc-card p {
  margin: 0 0 0.75rem;
  color: var(--ink-mute);
  font-size: 0.94rem;
}
.uc-result {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.9rem;
  line-height: 1.45;
}

.poc-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.75rem;
}

.pricing-note {
  margin: 1.5rem 0 0;
  color: var(--ink-mute);
  font-size: 0.92rem;
}

@media (max-width: 1000px) {
  .lane-grid { grid-template-columns: 1fr 1fr; }
  .uc-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  .lane-grid,
  .uc-grid { grid-template-columns: 1fr; }
}