/* ==========================================================================
   THE LIQUIDITY LAB — cinematic scroll experience
   Dark base · cyan accent · typography-led
   ========================================================================== */

:root {
  --bg: #04070c;
  --ink: #eaf3f7;
  --muted: rgba(214, 231, 239, 0.6);
  --faint: rgba(214, 231, 239, 0.32);
  --cyan: #4be1ff;
  --cyan-soft: rgba(75, 225, 255, 0.16);
  --cyan-line: rgba(75, 225, 255, 0.28);
  --line: rgba(150, 205, 230, 0.12);
  --panel: rgba(8, 14, 22, 0.55);
  --panel-strong: rgba(9, 16, 25, 0.78);
  --ember: #ff6a3d;

  --font-display: "Space Grotesk", "Inter", sans-serif;
  --font-serif: "Instrument Serif", Georgia, serif;
  --font-body: "Inter", system-ui, sans-serif;

  --step-hero: clamp(2.5rem, 6.4vw + 0.6rem, 6rem);
  --step-h2: clamp(2rem, 4.2vw + 0.5rem, 4.1rem);
  --step-line: clamp(1.45rem, 2.6vw + 0.5rem, 2.7rem);
  --step-lead: clamp(1.05rem, 0.7vw + 0.85rem, 1.3rem);

  --space-chapter: clamp(9rem, 18vh, 14rem);
  --gutter: clamp(1.25rem, 5vw, 4rem);
  --header-h: 76px;
}

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

html {
  scroll-behavior: auto; /* Lenis owns scrolling */
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: clip;
}

::selection { background: rgba(75, 225, 255, 0.28); color: #fff; }

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

a { color: inherit; }

h1, h2, h3 { margin: 0; font-family: var(--font-display); font-weight: 600; }

em {
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 400;
  color: var(--cyan);
  letter-spacing: 0.01em;
}

/* ---------- background canvas ---------- */

#fluid-canvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

/* graceful fallback when WebGL is unavailable */
body.no-webgl {
  background:
    radial-gradient(120% 90% at 70% 0%, rgba(20, 50, 75, 0.55), transparent 60%),
    radial-gradient(100% 80% at 10% 100%, rgba(10, 30, 48, 0.5), transparent 55%),
    var(--bg);
}

main { position: relative; z-index: 1; }

/* ---------- a11y ---------- */

.skip-link {
  position: absolute;
  top: -48px;
  left: 16px;
  z-index: 100;
  padding: 10px 18px;
  background: var(--cyan);
  color: #03161d;
  font-weight: 600;
  text-decoration: none;
  border-radius: 6px;
  transition: top 0.2s ease;
}
.skip-link:focus { top: 12px; }

:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- scroll progress ---------- */

.scroll-progress {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 2px;
  z-index: 60;
  background: transparent;
}
.scroll-progress span {
  display: block;
  height: 100%;
  width: 100%;
  background: linear-gradient(90deg, rgba(75,225,255,0.25), var(--cyan));
  transform-origin: 0 50%;
  transform: scaleX(0);
}

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

.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  height: var(--header-h);
  padding: 0 var(--gutter);
  transition: background 0.5s ease, backdrop-filter 0.5s ease, border-color 0.5s ease;
  border-bottom: 1px solid transparent;
}
.site-header.is-scrolled {
  background: rgba(4, 8, 13, 0.72);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom-color: var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  text-decoration: none;
  font-family: var(--font-display);
  font-size: 0.8rem;
  letter-spacing: 0.22em;
}
.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 36px; height: 36px;
  border: 1px solid var(--cyan-line);
  border-radius: 8px;
  font-size: 0.66rem;
  letter-spacing: 0.12em;
  color: var(--cyan);
  background: rgba(75, 225, 255, 0.06);
}
.brand-mark-img {
  display: block;
  object-fit: cover;
  padding: 0;
  background: #05080d;
}
.brand-word { color: var(--muted); }
.brand-word strong { color: var(--ink); font-weight: 600; }

.footer-logo {
  display: block;
  width: 264px;
  max-width: 70vw;
  height: auto;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: clamp(1rem, 2.5vw, 2.2rem);
}
.nav-links a {
  text-decoration: none;
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  transition: color 0.3s ease;
}
.nav-links a:hover { color: var(--ink); }

.nav-pill {
  padding: 0.55rem 1.3rem;
  border: 1px solid var(--cyan-line);
  border-radius: 999px;
  color: var(--cyan) !important;
  background: rgba(75, 225, 255, 0.07);
  transition: background 0.3s ease, box-shadow 0.3s ease;
}
.nav-pill:hover {
  background: rgba(75, 225, 255, 0.16);
  box-shadow: 0 0 24px rgba(75, 225, 255, 0.25);
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 1rem 2.4rem;
  border-radius: 999px;
  font-family: var(--font-display);
  font-size: 0.92rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.35s cubic-bezier(0.22, 1, 0.36, 1), box-shadow 0.35s ease, background 0.35s ease, border-color 0.35s ease;
  will-change: transform;
}
.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }

.btn-primary {
  background: linear-gradient(135deg, #6ae8ff, #2cb8e8);
  color: #03161d;
  box-shadow: 0 8px 36px rgba(75, 225, 255, 0.28);
}
.btn-primary:hover { box-shadow: 0 12px 48px rgba(75, 225, 255, 0.45); }

.btn-ghost {
  border: 1px solid var(--line);
  color: var(--ink);
  background: rgba(255, 255, 255, 0.03);
}
.btn-ghost:hover {
  border-color: var(--cyan-line);
  background: rgba(75, 225, 255, 0.07);
}

.btn-elite { border-color: var(--cyan-line); color: var(--cyan); }

.btn-lg { padding: 1.25rem 3.4rem; font-size: 1rem; }

@keyframes pulse-glow {
  0%, 100% { box-shadow: 0 8px 36px rgba(75, 225, 255, 0.25); }
  50% { box-shadow: 0 8px 56px rgba(75, 225, 255, 0.55); }
}
.btn-pulse { animation: pulse-glow 3.2s ease-in-out infinite; }

/* ---------- chapters / shared ---------- */

.chapter {
  position: relative;
  padding: var(--space-chapter) var(--gutter);
  max-width: 1280px;
  margin: 0 auto;
}

.chapter-label {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.34em;
  text-transform: uppercase;
  color: var(--cyan);
  margin-bottom: 1.6rem;
}

.chapter-title {
  font-size: var(--step-h2);
  line-height: 1.06;
  letter-spacing: -0.02em;
  max-width: 18ch;
}
.chapter-title-sm { font-size: clamp(1.7rem, 3vw + 0.5rem, 2.8rem); max-width: 24ch; }

.chapter-lead {
  font-size: var(--step-lead);
  color: var(--muted);
  max-width: 58ch;
  margin: 1.8rem 0 0;
}

.chapter-head { margin-bottom: clamp(3rem, 7vh, 5.5rem); }

.aieo-question {
  margin: 0 0 0.9rem;
  font-family: var(--font-serif);
  font-style: italic;
  font-size: clamp(1.05rem, 1vw + 0.9rem, 1.4rem);
  color: var(--faint);
}

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

.hero {
  min-height: 100svh;
  max-width: none;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding-top: calc(var(--header-h) + 2rem);
}

/* soft pool of dark behind the copy so the paint never fights the words */
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(95% 75% at 30% 48%, rgba(3, 6, 10, 0.58), transparent 68%);
  pointer-events: none;
}

.hero-inner {
  position: relative;
  max-width: 1280px;
  margin: 0 auto;
  width: 100%;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  margin: 0 0 2.2rem;
  font-family: var(--font-display);
  font-size: 0.74rem;
  font-weight: 500;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--muted);
}
.eyebrow-dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 12px var(--cyan);
  flex: 0 0 auto;
}

.hero-headline {
  font-size: var(--step-hero);
  line-height: 1.04;
  letter-spacing: -0.025em;
  font-weight: 600;
  max-width: 16ch;
}
.hero-headline em { display: inline-block; }

.hero-sub {
  margin: 2.2rem 0 0;
  font-size: var(--step-lead);
  color: var(--muted);
  max-width: 52ch;
}

.hero-cta { margin-top: 3rem; }

/* split-word masking */
.w { display: inline-block; overflow: hidden; vertical-align: bottom; padding-bottom: 0.08em; margin-bottom: -0.08em; }
.w > .wi { display: inline-block; will-change: transform; }

.scroll-cue {
  position: absolute;
  left: 50%;
  bottom: 2.2rem;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.7rem;
  text-decoration: none;
  font-family: var(--font-display);
  font-size: 0.68rem;
  letter-spacing: 0.34em;
  text-transform: uppercase;
  color: var(--faint);
  transition: color 0.3s ease;
}
.scroll-cue:hover { color: var(--cyan); }
.scroll-cue i {
  width: 1px;
  height: 44px;
  background: linear-gradient(to bottom, var(--cyan), transparent);
  animation: cue-drop 2.4s ease-in-out infinite;
}
@keyframes cue-drop {
  0% { transform: scaleY(0); transform-origin: top; opacity: 0; }
  35% { transform: scaleY(1); transform-origin: top; opacity: 1; }
  70%, 100% { transform: scaleY(0); transform-origin: bottom; opacity: 0.4; }
}

/* ---------- problem / momentum (illuminated lines) ---------- */

.problem, .momentum { max-width: 1100px; }

.problem-lines, .momentum-lines {
  display: flex;
  flex-direction: column;
  gap: clamp(4rem, 12vh, 9rem);
  padding: clamp(2rem, 6vh, 4rem) 0;
}

.line {
  margin: 0;
  font-family: var(--font-display);
  font-size: var(--step-line);
  font-weight: 500;
  line-height: 1.25;
  letter-spacing: -0.015em;
  max-width: 26ch;
}
.line:nth-child(even) {
  margin-left: auto;
  text-align: right;
  max-width: 28ch;
}

.line-close {
  font-size: calc(var(--step-line) * 1.18);
  font-weight: 600;
}

.momentum-footnote {
  margin: clamp(4rem, 9vh, 6rem) 0 0;
  text-align: center;
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 1.1rem;
  color: var(--faint);
}

/* ---------- solution ---------- */

.engine-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 18px;
  overflow: hidden;
}

.engine-card {
  background: var(--panel);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  padding: clamp(1.6rem, 2.5vw, 2.4rem);
  position: relative;
}
.engine-card::after {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--cyan), transparent);
  opacity: 0;
  transition: opacity 0.5s ease;
}
.engine-card:hover::after { opacity: 1; }

.engine-index {
  font-family: var(--font-display);
  font-size: 0.72rem;
  letter-spacing: 0.3em;
  color: var(--cyan);
}
.engine-card h3 {
  margin: 1rem 0 0.6rem;
  font-size: 1.25rem;
  letter-spacing: -0.01em;
}
.engine-card p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.6;
  color: var(--muted);
}

.solution-note {
  margin: 2.6rem 0 0;
  font-size: 0.95rem;
  color: var(--faint);
  max-width: 64ch;
}

/* ---------- packages ---------- */

.package-stack {
  display: flex;
  flex-direction: column;
  gap: clamp(2.5rem, 8vh, 5rem);
}

.package-card {
  position: relative;
  display: grid;
  grid-template-columns: minmax(200px, 0.85fr) 2fr;
  gap: clamp(1.5rem, 4vw, 4rem);
  padding: clamp(2rem, 4vw, 3.5rem);
  border: 1px solid var(--line);
  border-radius: 22px;
  background: var(--panel);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  transition: border-color 0.5s ease, box-shadow 0.5s ease;
}
.package-card:hover { border-color: rgba(150, 205, 230, 0.25); }

.package-card.is-recommended {
  border-color: var(--cyan-line);
  background: var(--panel-strong);
  box-shadow: 0 24px 80px rgba(40, 170, 210, 0.12), inset 0 1px 0 rgba(75, 225, 255, 0.15);
}
.package-card.is-recommended:hover {
  box-shadow: 0 24px 90px rgba(40, 170, 210, 0.2), inset 0 1px 0 rgba(75, 225, 255, 0.2);
}

.package-flag {
  position: absolute;
  top: -13px;
  left: clamp(2rem, 4vw, 3.5rem);
  padding: 0.35rem 1.1rem;
  border-radius: 999px;
  background: linear-gradient(135deg, #6ae8ff, #2cb8e8);
  color: #03161d;
  font-family: var(--font-display);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}
.flag-limited {
  background: rgba(9, 16, 25, 0.95);
  color: var(--cyan);
  border: 1px solid var(--cyan-line);
}

.package-meta {
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
  padding-top: 0.4rem;
}
.package-tier {
  font-family: var(--font-display);
  font-size: 0.72rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--cyan);
}
.package-identity {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: clamp(1.2rem, 1.4vw + 0.8rem, 1.7rem);
  line-height: 1.3;
  color: var(--ink);
  max-width: 16ch;
}

.package-body h3 {
  font-size: clamp(1.8rem, 2.4vw, 2.5rem);
  letter-spacing: -0.02em;
}
.package-price {
  margin: 0.6rem 0 1.1rem;
  font-family: var(--font-display);
  font-size: clamp(2.1rem, 3vw, 2.9rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--ink);
}
.package-price small {
  font-size: 0.5em;
  font-weight: 500;
  vertical-align: 0.55em;
  color: var(--muted);
  margin-right: 0.1em;
}
.package-price span {
  font-size: 0.36em;
  font-weight: 500;
  color: var(--muted);
  letter-spacing: 0.04em;
  margin-left: 0.4em;
}

.package-body > p {
  margin: 0 0 1.4rem;
  color: var(--muted);
  max-width: 56ch;
}

.package-body ul {
  list-style: none;
  margin: 0 0 2rem;
  padding: 0;
  display: grid;
  gap: 0.55rem;
}
.package-body li {
  position: relative;
  padding-left: 1.5rem;
  font-size: 0.94rem;
  color: var(--muted);
}
.package-body li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 14px;
  height: 1px;
  background: var(--cyan);
}

/* ---------- proof ---------- */

.proof-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(1.5rem, 4vw, 3rem);
  margin-bottom: clamp(3.5rem, 8vh, 6rem);
}
.stat {
  border-left: 1px solid var(--cyan-line);
  padding-left: clamp(1rem, 2vw, 1.8rem);
}
.stat strong {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(2.6rem, 4.5vw, 4.5rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1;
  color: var(--ink);
}
.stat > span {
  display: block;
  margin-top: 0.6rem;
  font-size: 0.86rem;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.proof-quote {
  margin: 0;
  max-width: 880px;
}
.proof-quote blockquote {
  margin: 0;
  font-family: var(--font-serif);
  font-style: italic;
  font-size: clamp(1.5rem, 2.6vw + 0.4rem, 2.6rem);
  line-height: 1.35;
  color: var(--ink);
}
.proof-quote .caret {
  display: inline-block;
  width: 2px;
  height: 0.95em;
  margin-left: 4px;
  vertical-align: -0.12em;
  background: var(--cyan);
  opacity: 0;
}
.proof-quote.is-typing .caret { opacity: 1; animation: caret-blink 0.85s step-end infinite; }
@keyframes caret-blink { 50% { opacity: 0; } }

.proof-quote figcaption {
  margin-top: 1.6rem;
  font-size: 0.82rem;
  line-height: 1.7;
  color: var(--faint);
  max-width: 56ch;
}
.placeholder-tag {
  display: inline-block;
  margin-right: 0.6rem;
  margin-bottom: 0.3rem;
  padding: 0.2rem 0.7rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-family: var(--font-display);
  font-style: normal;
  font-size: 0.64rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
}

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

.faq { max-width: 880px; }

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

details {
  border-bottom: 1px solid var(--line);
}
summary {
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 1.5rem 0.2rem;
  cursor: pointer;
  font-family: var(--font-display);
  font-size: 1.06rem;
  font-weight: 500;
  letter-spacing: -0.005em;
  transition: color 0.3s ease;
}
summary::-webkit-details-marker { display: none; }
summary:hover { color: var(--cyan); }

summary i {
  position: relative;
  flex: 0 0 auto;
  width: 14px;
  height: 14px;
}
summary i::before, summary i::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 0;
  width: 100%;
  height: 1.5px;
  background: var(--cyan);
  transition: transform 0.4s cubic-bezier(0.22, 1, 0.36, 1);
}
summary i::after { transform: rotate(90deg); }
details[open] summary i::after { transform: rotate(0deg); }

.faq-body { overflow: hidden; }
.faq-body p {
  margin: 0;
  padding: 0 0.2rem 1.6rem;
  color: var(--muted);
  font-size: 0.96rem;
  max-width: 64ch;
}
.faq-body strong { color: var(--ink); font-weight: 600; }

/* ---------- final cta ---------- */

.final {
  min-height: 92svh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  max-width: none;
}
.final-inner { max-width: 980px; margin: 0 auto; }

.final-headline {
  font-size: clamp(2.4rem, 5.4vw + 0.5rem, 5.4rem);
  line-height: 1.06;
  letter-spacing: -0.025em;
}

.final-cta { margin-top: 3.2rem; }

.final-note {
  margin: 2.2rem 0 0;
  font-family: var(--font-display);
  font-size: 0.78rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--faint);
}

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

.site-footer {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--line);
  padding: 3rem var(--gutter) 3.5rem;
  max-width: 1280px;
  margin: 0 auto;
}
.footer-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  flex-wrap: wrap;
  margin-bottom: 2rem;
}
.footer-brand {
  font-family: var(--font-display);
  font-size: 0.8rem;
  letter-spacing: 0.22em;
  color: var(--muted);
}
.footer-brand strong { color: var(--ink); font-weight: 600; }
.footer-links { display: flex; gap: 1.8rem; }
.footer-links a {
  text-decoration: none;
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  transition: color 0.3s ease;
}
.footer-links a:hover { color: var(--cyan); }
.footer-legal {
  margin: 0;
  font-size: 0.78rem;
  line-height: 1.8;
  color: var(--faint);
  max-width: 72ch;
}

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

@media (max-width: 1024px) {
  .engine-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 880px) {
  .package-card { grid-template-columns: 1fr; gap: 1.2rem; }
  .package-identity { max-width: none; }
  .proof-stats { grid-template-columns: 1fr; gap: 2rem; }
}

@media (max-width: 720px) {
  :root { --header-h: 64px; }
  /* keep the full nav on mobile: hide the brand wordmark instead
     (the logo mark carries the brand) and compact the links */
  .brand-word { display: none; }
  .nav-links { gap: 0.9rem; }
  .nav-links a { font-size: 0.72rem; letter-spacing: 0.06em; }
  .nav-pill { padding: 0.45rem 0.95rem; }
  .line, .line:nth-child(even) {
    max-width: none;
    margin-left: 0;
    text-align: left;
  }
  .problem-lines, .momentum-lines { gap: clamp(3rem, 9vh, 5rem); }
  .engine-grid { grid-template-columns: 1fr; }
  .scroll-cue { display: none; }
  .hero { padding-top: calc(var(--header-h) + 1rem); }
  .hero-cta .btn, .final-cta .btn { width: 100%; }
  .btn { padding: 1rem 1.8rem; }
  .footer-top { flex-direction: column; align-items: flex-start; }
}

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

@media (prefers-reduced-motion: reduce) {
  .btn-pulse, .scroll-cue i { animation: none; }
  * { scroll-behavior: auto !important; }
}