/* ================================================================
   KAPSLEAD — Research & Introductions
   Dark institutional system keyed to the KAPSLEAD logomark.
   Sora / Inter / IBM Plex Mono.
   ================================================================ */

:root {
  --bg: #000c18;
  --bg-raise: #01121f;
  --bg-card: #021627;
  --line: rgba(12, 48, 72, 0.6);
  --line-strong: #0c3048;
  --text: #e4f0fc;
  --muted: #8ca9c0;
  --faint: #6787a0;
  --accent: #30b4f0;
  --accent-bright: #30c0fc;
  --accent-mid: #2490c0;
  --accent-core: #e4f0fc;
  --font-display: "Sora", sans-serif;
  --font-body: "Inter", sans-serif;
  --font-mono: "IBM Plex Mono", monospace;
}

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

html { scroll-behavior: smooth; }

#top, #model, #signals, #who, #faq {
  scroll-margin-top: 88px;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.container {
  max-width: 1120px;
  margin: 0 auto;
  padding-inline: 32px;
}

/* ---------- type ---------- */

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 500;
  letter-spacing: -0.02em;
  line-height: 1.12;
}

h1 { font-size: clamp(1.8rem, 3.1vw, 2.75rem); font-weight: 600; line-height: 1.14; }
h2 { font-size: clamp(1.65rem, 3vw, 2.3rem); }
h3 { font-size: 1.1rem; letter-spacing: -0.01em; }

p { color: var(--muted); }

a { color: inherit; text-decoration: none; }

:focus-visible {
  outline: 2px solid var(--accent-bright);
  outline-offset: 3px;
  border-radius: 2px;
}

.eyebrow {
  font-family: var(--font-display);
  font-size: 0.92rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 20px;
}

/* ---------- header ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(0, 12, 24, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 88px;
  gap: 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
}

.brand-mark {
  display: block;
  width: 60px;
  height: 60px;
}

.wordmark {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.5rem;
  letter-spacing: 0.1em;
  color: var(--text);
}

.site-nav {
  display: flex;
  gap: 32px;
}

.site-nav a {
  font-size: 0.86rem;
  color: var(--muted);
  transition: color 0.2s ease;
}

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

/* ---------- buttons ---------- */

.btn {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 0.92rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  padding: 13px 26px;
  border: 1px solid var(--line-strong);
  border-radius: 3px;
  transition: border-color 0.2s ease, background 0.2s ease, color 0.2s ease;
  white-space: nowrap;
}

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

.btn-primary:hover {
  background: var(--accent-bright);
  border-color: var(--accent-bright);
  box-shadow: 0 0 16px rgba(48, 192, 252, 0.25);
}

.btn-ghost { color: var(--text); }

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

.btn-small {
  padding: 8px 18px;
  font-size: 0.82rem;
  color: var(--text);
}

.btn-small:hover {
  border-color: var(--accent-bright);
  color: var(--accent-bright);
}

/* ---------- hero ---------- */

.hero {
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  align-items: center;
  gap: 48px;
  padding-top: 48px;
  padding-bottom: 96px;
}

.hero-copy .lede {
  margin-top: 24px;
  font-size: 1.08rem;
  max-width: 34em;
}

.hero-stat {
  margin-top: 28px;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 0.95rem;
  letter-spacing: 0.01em;
  color: var(--accent);
}

.hero-actions {
  margin-top: 24px;
  display: flex;
  gap: 28px;
  flex-wrap: wrap;
}

.hero-link {
  font-family: var(--font-display);
  font-size: 0.94rem;
  font-weight: 500;
  color: var(--muted);
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-color: var(--line-strong);
}

.hero-link:hover { color: var(--text); }

.hero-link-accent {
  color: var(--accent);
  text-decoration-color: rgba(48, 180, 240, 0.4);
}

.hero-link-accent:hover { color: var(--accent-bright); }

/* ---------- routing motif ----------
   One hue family: the routed path is separated from declined
   signals by brightness and scale, as in the logomark. */

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

.wire {
  stroke: rgba(36, 144, 192, 0.42);
  stroke-width: 1.3;
  stroke-linecap: round;
  stroke-linejoin: round;
  fill: none;
}

.wire-routed {
  stroke: rgba(48, 180, 240, 0.85);
  stroke-width: 2.1;
  stroke-linecap: round;
  stroke-linejoin: round;
  fill: none;
}

.motif-label {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  fill: var(--muted);
}

.node {
  fill: var(--bg);
  stroke: var(--accent);
  stroke-width: 1.2;
}

.node-ring {
  fill: none;
  stroke: rgba(48, 180, 240, 0.28);
  stroke-width: 1;
}

.node-label { fill: var(--muted); }
.node-sublabel { font-size: 10.5px; fill: var(--faint); }

.endpoint {
  fill: var(--accent);
  filter: drop-shadow(0 0 6px rgba(48, 192, 252, 0.45));
}

.endpoint-core { fill: var(--accent-core); }

.endpoint-halo {
  fill: none;
  stroke: rgba(48, 192, 252, 0.4);
  stroke-width: 1;
  transform-box: fill-box;
  transform-origin: center;
  animation: halo-breathe 4.5s ease-in-out infinite;
}

@keyframes halo-breathe {
  0%, 100% { transform: scale(1); opacity: 0.55; }
  50% { transform: scale(1.35); opacity: 1; }
}

.routed-label { fill: var(--accent-bright); }

.pulse { fill: var(--accent-mid); opacity: 0; }

.pulse-routed {
  fill: var(--accent-core);
  filter: drop-shadow(0 0 5px rgba(48, 192, 252, 0.6));
}

/* ---------- sections ---------- */

.section {
  padding: 120px 0;
  border-bottom: 1px solid var(--line);
}

.section-alt { background: var(--bg-raise); }

.section-head { max-width: 620px; margin-bottom: 64px; }

.section-head h2 { margin-bottom: 18px; }

.section-lede { font-size: 1.04rem; }

/* ---------- steps ---------- */

.steps {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--line-strong);
  border: 1px solid var(--line-strong);
}

.step {
  background: var(--bg);
  padding: 32px 28px 36px;
}

.step-num {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: 0.02em;
  color: var(--accent);
  display: block;
  margin-bottom: 18px;
}

.step h3 { margin-bottom: 12px; }

.step p { font-size: 0.92rem; }

/* ---------- current signals ---------- */

.signals-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}

.signals-date {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 0.86rem;
  color: var(--faint);
  white-space: nowrap;
}

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

.signals-list li {
  display: flex;
  align-items: baseline;
  gap: 22px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}

.signals-num {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.86rem;
  color: var(--accent);
  flex: none;
}

.signals-txt {
  font-style: italic;
  font-size: 1.02rem;
  color: var(--text);
}

/* ---------- who ---------- */

.who-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.who-card {
  border: 1px solid var(--line-strong);
  background: var(--bg-card);
  padding: 40px 36px;
  display: flex;
  flex-direction: column;
  gap: 22px;
  align-items: flex-start;
}

.who-tag {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.86rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
}

.who-card p:not(.who-tag) { font-size: 0.97rem; }

.who-card .btn { margin-top: auto; }

/* ---------- faq ---------- */

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 1px;
  background: var(--line-strong);
  border: 1px solid var(--line-strong);
}

.faq-item {
  background: var(--bg);
  padding: 28px 32px;
}

.faq-q {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.05rem;
  color: var(--text);
  margin-bottom: 10px;
}

.faq-a {
  font-size: 0.95rem;
  max-width: 640px;
}

/* ---------- closing cta ---------- */

.closing-cta-inner {
  max-width: 640px;
  margin: 0 auto;
  text-align: center;
}

.closing-cta-inner h2 {
  margin-bottom: 18px;
}

.cta-accent {
  font-style: italic;
  color: var(--accent-bright);
}

.closing-cta-inner .section-lede {
  margin: 0 auto;
}

.closing-cta-actions {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 36px;
}

/* ---------- footer ---------- */

.site-footer { padding: 56px 0; }

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 24px;
  flex-wrap: wrap;
}

.footer-tag {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--faint);
  margin-top: 10px;
}

.footer-meta { text-align: right; }

.footer-meta a {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--muted);
  margin-bottom: 4px;
}

.footer-meta a:hover { color: var(--accent-bright); }

.footer-meta p {
  font-size: 0.76rem;
  color: var(--faint);
  margin-top: 8px;
}

/* ---------- reveal ---------- */

.reveal {
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- responsive ---------- */

@media (max-width: 900px) {
  .hero-grid {
    grid-template-columns: 1fr;
    padding-top: 72px;
    padding-bottom: 72px;
  }

  .hero-motif { max-width: 520px; }

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

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

  .site-nav { display: none; }
}

@media (max-width: 640px) {
  .hero-motif { max-width: 340px; margin: 0 auto; }
}

@media (max-width: 560px) {
  .container { padding-inline: 22px; }

  .section { padding: 84px 0; }

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

  .footer-inner { align-items: flex-start; flex-direction: column; }

  .footer-meta { text-align: left; }

  .header-inner { gap: 10px; }

  .brand { gap: 8px; }

  .brand-mark { width: 38px; height: 38px; }

  .wordmark { font-size: 1.05rem; letter-spacing: 0.06em; }

  .btn-small {
    padding: 7px 12px;
    font-size: 0.72rem;
    white-space: normal;
    text-align: center;
    line-height: 1.25;
  }
}

/* ---------- reduced motion ---------- */

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .pulse { display: none; }

  .endpoint-halo { animation: none; }
}