/* ============ Tokens (PRD §2) ============ */
:root {
  --ink: #15101F;
  --muted: #6B6478;
  --line: #E9E5F0;
  --violet: #6C3AA8;
  --coral: #D9684F;
  --amber: #E39A4E;
  --bg: #FAFAFD;

  --soft-wash:
    radial-gradient(circle at 20% 30%, rgba(108,58,168,0.16) 0%, transparent 46%),
    radial-gradient(circle at 82% 20%, rgba(227,154,78,0.20) 0%, transparent 44%),
    radial-gradient(circle at 55% 85%, rgba(217,104,79,0.16) 0%, transparent 50%),
    #FDFCFB;

  --band-wash:
    radial-gradient(circle at 12% 25%, rgba(108,58,168,0.30) 0%, transparent 48%),
    radial-gradient(circle at 88% 18%, rgba(227,154,78,0.34) 0%, transparent 46%),
    radial-gradient(circle at 60% 90%, rgba(217,104,79,0.30) 0%, transparent 52%),
    linear-gradient(135deg, #F3ECFB 0%, #FBE9E2 45%, #FCEFD9 100%);
}

/* ============ Reset & base ============ */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-weight: 400;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
h1, h2, h3 {
  font-weight: 800;
  letter-spacing: -0.02em;
  margin: 0 0 0.5em;
  color: var(--ink);
}
p { margin: 0 0 1em; color: var(--muted); }

.eyebrow {
  color: var(--coral);
  font-weight: 700;
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 0.75em;
}

/* ============ Buttons ============ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 100px;
  font-weight: 700;
  font-size: 0.95rem;
  padding: 0.7em 1.5em;
  border: 1px solid transparent;
  cursor: pointer;
  transition: color 0.2s, background-color 0.2s, border-color 0.2s, transform 0.2s;
  white-space: nowrap;
}
.btn-primary {
  background: var(--ink);
  color: #fff;
}
.btn-primary:hover { transform: scale(1.03); }
.btn-outline {
  background: transparent;
  color: var(--ink);
  border-color: var(--line);
}
.btn-outline:hover { background: rgba(21,16,31,0.04); }
.btn-ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--line);
}
.btn-ghost:hover { background: rgba(21,16,31,0.04); }
.btn-lg { padding: 0.85em 1.9em; font-size: 1rem; }

.text-link {
  color: var(--ink);
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color 0.2s;
}
.text-link:hover { color: var(--coral); }

/* ============ Chips ============ */
.chip {
  display: inline-flex;
  align-items: center;
  border-radius: 100px;
  padding: 0.3em 0.9em;
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.03em;
  white-space: nowrap;
}
.chip-pass { background: rgba(108,58,168,0.12); color: var(--violet); }
.chip-gap { background: rgba(217,104,79,0.12); color: var(--coral); }

/* ============ Nav ============ */
.nav {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(250,250,253,0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 1.1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}
.nav-logo {
  font-weight: 800;
  font-size: 1.2rem;
  letter-spacing: -0.02em;
}
.nav-logo .dot { color: var(--coral); }
.nav-links {
  display: flex;
  gap: 2rem;
  flex: 1;
  justify-content: center;
}
.nav-links a {
  color: var(--muted);
  font-weight: 500;
  font-size: 0.95rem;
  transition: color 0.2s;
}
.nav-links a:hover,
.nav-links a.is-active { color: var(--ink); }
.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* ============ Ambient gradient drift (PRD §4.3) ============ */
.mesh-soft {
  background: var(--soft-wash);
  background-size: 160% 160%;
  animation: meshDrift 22s ease-in-out infinite;
}
.mesh-band {
  background: var(--band-wash);
  background-size: 160% 160%;
  animation: meshDrift 22s ease-in-out infinite;
}

@keyframes meshDrift {
  0%   { background-position: 0% 0%; }
  50%  { background-position: 100% 40%; }
  100% { background-position: 0% 0%; }
}

/* ============ Scroll reveal (PRD §4.1) ============ */
@keyframes revealUp {
  from { opacity: 0; transform: translateY(18px); }
  to   { opacity: 1; transform: translateY(0); }
}
.reveal { opacity: 0; }
.reveal.is-visible {
  animation: revealUp 0.6s cubic-bezier(0.16,1,0.3,1) forwards;
}

/* ============ 1. Hero ============ */
.hero {
  padding: 5rem 1.5rem 7rem;
  text-align: center;
}
.hero-inner {
  max-width: 900px;
  margin: 0 auto;
}
.hero h1 {
  font-size: clamp(2.6rem, 6vw, 4.2rem);
  line-height: 1.05;
}
.hero-sub {
  max-width: 640px;
  margin: 1.5rem auto 2.5rem;
  font-size: 1.15rem;
  line-height: 1.6;
}
.hero-ctas {
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 3.5rem;
}

/* Floating evidence card (PRD §4.4) */
@keyframes popSettle {
  from { opacity: 0; transform: translateY(28px) scale(0.98); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}
.float-card { animation: popSettle 0.7s cubic-bezier(0.16,1,0.3,1) 0.4s both; }

.evidence-card {
  display: flex;
  align-items: center;
  gap: 1rem;
  max-width: 780px;
  margin: 0 auto;
  background: #fff;
  border-radius: 20px;
  padding: 1.1rem 1.5rem;
  box-shadow: 0 20px 45px -20px rgba(21,16,31,0.25);
  text-align: left;
  transition: opacity 0.3s ease, transform 0.3s ease;
}
.evidence-card.is-swapping {
  opacity: 0;
  transform: translateY(6px);
}
.evidence-icon {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, var(--violet), var(--coral));
}
.evidence-body { flex: 1; min-width: 0; }
.evidence-title { font-weight: 700; color: var(--ink); margin: 0 0 0.2em; }
.evidence-quote { color: var(--muted); font-style: italic; margin: 0; font-size: 0.9rem; }

.evidence-dots {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  margin-top: 1rem;
}
.evidence-dot {
  width: 8px;
  height: 8px;
  padding: 0;
  border: none;
  border-radius: 50%;
  background: var(--line);
  cursor: pointer;
  transition: background-color 0.2s, transform 0.2s;
}
.evidence-dot.is-active {
  background: var(--coral);
  transform: scale(1.3);
}

/* ============ 2. Feature Switcher ============ */
.switcher {
  padding: 6rem 1.5rem;
  background: var(--bg);
}
.switcher-inner {
  max-width: 1100px;
  margin: 0 auto;
}
.switcher h2 {
  text-align: center;
  font-size: clamp(2rem, 4vw, 2.7rem);
  margin-bottom: 2.5rem;
}

.tabs {
  display: flex;
  justify-content: center;
  gap: 0.6rem;
  flex-wrap: wrap;
  margin-bottom: 2.5rem;
}
.tab {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--muted);
  font-weight: 600;
  font-size: 0.95rem;
  border-radius: 100px;
  padding: 0.75em 1.4em;
  cursor: pointer;
  transition: color 0.2s, background-color 0.2s, border-color 0.2s;
}
.tab:hover { color: var(--ink); }
.tab.is-active {
  background: var(--ink);
  color: #fff;
  border-color: var(--ink);
}
.tab-label { position: relative; z-index: 1; }
.tab-progress {
  position: absolute;
  left: 0;
  bottom: 0;
  height: 3px;
  width: 0%;
  background: var(--coral);
}
.tab.is-active .tab-progress.is-running {
  animation: segment-progress 6s linear forwards;
}
@keyframes segment-progress {
  from { width: 0%; }
  to   { width: 100%; }
}

.tab-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 32px;
  padding: 3rem;
  overflow: hidden;
}
.tab-panel {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}
.tab-panel[hidden] { display: none; }
.tab-panel-copy h3 {
  font-size: 1.8rem;
  margin-bottom: 0.6em;
}
.tab-panel-visual {
  border-radius: 24px;
  padding: 2.5rem;
  min-height: 220px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.finding-card {
  background: #fff;
  border-radius: 18px;
  padding: 1.3rem 1.5rem;
  box-shadow: 0 20px 40px -18px rgba(21,16,31,0.22);
  width: 100%;
  max-width: 360px;
}
.finding-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-weight: 700;
  margin-bottom: 0.6em;
  gap: 0.75rem;
}
.finding-quote {
  font-style: italic;
  color: var(--muted);
  font-size: 0.92rem;
  margin: 0;
}

/* ============ 3. Differentiator Trio ============ */
.trio {
  padding: 6rem 1.5rem;
}
.trio-inner {
  max-width: 1180px;
  margin: 0 auto;
  border-radius: 32px;
  padding: 4rem 3rem;
}
.trio h2 {
  text-align: center;
  font-size: clamp(2rem, 4vw, 2.6rem);
  max-width: 760px;
  margin: 0 auto 0.5em;
}
.trio-sub {
  text-align: center;
  font-size: 1.05rem;
  margin-bottom: 3rem;
}
.trio-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}
.trio-card {
  background: rgba(255,255,255,0.72);
  backdrop-filter: blur(6px);
  border-radius: 24px;
  padding: 2rem;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.trio-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 18px 40px -20px rgba(21,16,31,0.25);
}
.trio-num {
  display: block;
  color: var(--coral);
  font-weight: 800;
  font-size: 0.85rem;
  margin-bottom: 0.75em;
}
.trio-card h3 { font-size: 1.2rem; margin-bottom: 0.5em; }
.trio-card p { margin: 0; font-size: 0.95rem; }

/* ============ 4. Integrations + Close ============ */
.integrations {
  padding: 6rem 1.5rem 5rem;
}
.integrations-inner {
  max-width: 1000px;
  margin: 0 auto;
  text-align: center;
}
.integrations h2 {
  font-size: clamp(1.9rem, 4vw, 2.4rem);
  margin-bottom: 2.5rem;
}

.integration-tiles {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  flex-wrap: wrap;
  margin-bottom: 3.5rem;
}
.integration-tile {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 24px;
  padding: 2rem 2.5rem;
  min-width: 220px;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.integration-tile:hover {
  transform: translateY(-3px);
  box-shadow: 0 18px 40px -20px rgba(21,16,31,0.2);
}
.integration-chip-slot {
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.2rem;
}
.integration-chip {
  display: flex;
  align-items: center;
  justify-content: center;
}
.chip-justcall {
  width: 96px;
  height: 34px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--violet), #8B5BC4);
}
.chip-intercom {
  width: 56px;
  height: 56px;
  border-radius: 16px;
  background: linear-gradient(135deg, var(--coral), var(--amber));
}
.integration-name { font-weight: 700; color: var(--ink); margin: 0 0 0.2em; }
.integration-desc { font-size: 0.9rem; margin: 0; }

.cta-band {
  border-radius: 28px;
  padding: 2.5rem 3rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  flex-wrap: wrap;
  text-align: left;
}
.cta-band p {
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin: 0;
  max-width: 480px;
}

/* ============ Footer ============ */
.footer {
  border-top: 1px solid var(--line);
  padding: 2rem 1.5rem;
}
.footer-inner {
  max-width: 1180px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}
.footer-links {
  display: flex;
  gap: 1.75rem;
  flex-wrap: wrap;
}
.footer-links a {
  color: var(--muted);
  font-size: 0.9rem;
  transition: color 0.2s;
}
.footer-links a:hover { color: var(--ink); }

/* ============ Reduced motion (PRD §4 / §6) ============ */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .mesh-soft, .mesh-band { animation: none; }
  .tab-progress.is-running { animation: none; width: 0%; }
  .reveal.is-visible { animation: revealUp 0.3s ease forwards; }
  .float-card { animation: none; opacity: 1; transform: none; }
  .btn, .trio-card, .integration-tile, .integration-detail, .evidence-card { transition: none; }
}

/* ============ Subpages (Product / How it works / Integrations) ============ */
.page-hero {
  padding: 4.5rem 1.5rem 3.5rem;
  text-align: center;
}
.page-hero-inner {
  max-width: 820px;
  margin: 0 auto;
}
.page-hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.4rem);
  line-height: 1.08;
  margin-bottom: 0;
}

.section-more {
  text-align: center;
  margin: 1.75rem 0 0;
}
.section-more .text-link { font-size: 0.95rem; }

.stack-page {
  padding: 0 1.5rem 5rem;
}
.stack-inner {
  max-width: 820px;
  margin: 0 auto;
}

.feature-block {
  padding: 2.25rem 0;
  border-bottom: 1px solid var(--line);
}
.feature-block:last-of-type { border-bottom: none; }
.feature-block h2 {
  font-size: 1.45rem;
  margin-bottom: 0.45em;
}
.feature-block p { margin: 0; font-size: 1.02rem; line-height: 1.65; }

.trust-band {
  margin: 3rem auto 0;
  max-width: 820px;
  border-radius: 32px;
  padding: 2.5rem 2.25rem;
}
.trust-band h2 {
  font-size: 1.45rem;
  margin-bottom: 0.5em;
}
.trust-band p { margin: 0; font-size: 1.02rem; line-height: 1.65; color: var(--ink); }

.step-stack {
  display: grid;
  gap: 1.15rem;
  margin-top: 0.5rem;
}
.step-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 24px;
  padding: 1.6rem 1.75rem;
}
.step-card h2 {
  font-size: 1.25rem;
  margin-bottom: 0.4em;
}
.step-card p { margin: 0; font-size: 1rem; line-height: 1.65; }

.explainer-list {
  display: grid;
  gap: 1.25rem;
  margin-top: 2.5rem;
}
.explainer-list .finding-card {
  max-width: none;
  padding: 1.6rem 1.75rem;
}
.explainer-list .finding-quote { font-size: 1rem; line-height: 1.65; }

.faq {
  margin-top: 3rem;
}
.faq h2 {
  font-size: 1.45rem;
  margin-bottom: 1rem;
}
.faq details {
  border-top: 1px solid var(--line);
  padding: 1rem 0;
}
.faq details:last-child { border-bottom: 1px solid var(--line); }
.faq summary {
  font-weight: 700;
  color: var(--ink);
  cursor: pointer;
  list-style: none;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+";
  float: right;
  color: var(--coral);
  font-weight: 800;
}
.faq details[open] summary::after { content: "–"; }
.faq details p {
  margin: 0.75rem 0 0;
  font-size: 0.98rem;
  line-height: 1.65;
}

.integration-details {
  display: grid;
  gap: 1.5rem;
  margin: 2.5rem 0 2rem;
  text-align: left;
}
.integration-detail {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 24px;
  padding: 2rem 2.25rem;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.integration-detail:hover {
  transform: translateY(-3px);
  box-shadow: 0 18px 40px -20px rgba(21,16,31,0.2);
}
.integration-detail .integration-chip-slot {
  margin: 0 0 1rem;
  justify-content: flex-start;
  height: auto;
}
.integration-fields {
  display: grid;
  gap: 1.1rem;
  margin-top: 1.25rem;
}
.integration-fields dt {
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--coral);
  margin: 0 0 0.3em;
}
.integration-fields dd {
  margin: 0;
  color: var(--muted);
  font-size: 0.98rem;
  line-height: 1.6;
}

.security-note {
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 1.15rem 1.35rem;
  text-align: left;
  margin: 0 auto 2rem;
  max-width: 820px;
}
.security-note p { margin: 0; font-size: 0.95rem; line-height: 1.6; }

.missing-tool {
  margin: 0 auto 3rem;
  max-width: 820px;
}
.missing-tool p { margin: 0; }

.subpage-close {
  padding: 0 1.5rem 5rem;
}
.subpage-close-inner {
  max-width: 1000px;
  margin: 0 auto;
}

@media (min-width: 720px) {
  .integration-fields {
    grid-template-columns: 1fr 1fr;
    gap: 1.25rem;
  }
  .integration-fields > div:last-child {
    grid-column: 1 / -1;
  }
}

@media (max-width: 860px) {
  .trust-band { padding: 2rem 1.35rem; }
  .integration-detail { padding: 1.5rem; }
}

/* ============ Mobile (PRD §5) ============ */
@media (max-width: 860px) {
  .nav-links { display: none; }
  .tab-panel { grid-template-columns: 1fr; }
  .trio-cards { grid-template-columns: 1fr; }
  .tabs {
    flex-wrap: nowrap;
    overflow-x: auto;
    justify-content: flex-start;
    -webkit-overflow-scrolling: touch;
    padding-bottom: 0.5rem;
  }
  .tabs::-webkit-scrollbar { display: none; }
  .hero-ctas { flex-direction: column; align-items: stretch; }
  .hero-ctas .btn { width: 100%; }
  .evidence-card { flex-wrap: wrap; }
  .cta-band { flex-direction: column; align-items: flex-start; text-align: left; }
  .trio-inner { padding: 3rem 1.5rem; }
  .tab-card { padding: 1.75rem; }
}