/* landing.css — PubMed Monitor marketing landing page */

:root {
  --ink: #06060b;
  --void: #0e0e18;
  --signal-violet: #6d5ef2;
  --signal-violet-soft: rgba(109, 94, 242, 0.16);
  --signal-ember: #f5a623;
  --paper: #f3f0e6;
  --mist: #8b8a9e;
  --text-primary: #f4f3f8;
  --text-secondary: var(--mist);
  --border: rgba(255, 255, 255, 0.08);

  --font-display: 'Space Grotesk', 'Inter', sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', Menlo, monospace;

  --radius-md: 12px;
  --radius-lg: 20px;
  --container-width: 1180px;
  --transition-base: 220ms cubic-bezier(0.4, 0, 0.2, 1);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--ink);
  color: var(--text-primary);
  font-family: var(--font-body);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

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

p { margin: 0 0 1em; color: var(--text-secondary); }

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

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--signal-violet);
  outline-offset: 3px;
}

.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* Nav */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 32px;
  backdrop-filter: blur(10px);
  background: rgba(6, 6, 11, 0.6);
  border-bottom: 1px solid var(--border);
}

.nav-brand {
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-primary);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: 999px;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 15px;
  transition: transform var(--transition-base), box-shadow var(--transition-base), background var(--transition-base), border-color var(--transition-base);
  border: 1px solid transparent;
  cursor: pointer;
}

.btn-primary {
  background: linear-gradient(135deg, var(--signal-violet), #4b3fd9);
  color: #fff;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 28px rgba(109, 94, 242, 0.35);
}

.btn-ghost {
  background: transparent;
  border-color: var(--border);
  color: var(--text-primary);
}

.btn-ghost:hover {
  border-color: var(--signal-violet);
  background: var(--signal-violet-soft);
}

/* Hero */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  padding: 120px 32px 80px;
}

#hero-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 640px;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--signal-ember);
  margin-bottom: 20px;
}

.hero-headline {
  font-size: clamp(2.6rem, 6vw, 4.6rem);
  font-weight: 700;
}

.hero-headline .text-muted { color: var(--mist); }

.hero-sub {
  font-size: 18px;
  max-width: 520px;
  margin-bottom: 32px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

/* Scroll reveal */
[data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 700ms ease var(--delay, 0ms), transform 700ms ease var(--delay, 0ms);
}

[data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Sections shared */
section { padding: 120px 0; position: relative; }

.section-heading {
  max-width: 640px;
  margin: 0 auto 64px;
  text-align: center;
}

.section-heading h2 { font-size: clamp(2rem, 4vw, 2.8rem); }

/* CSS-only mesh echo — carries the hero's atmosphere into later sections without a canvas.
   Animates transform (compositor-only) instead of background-position: animating
   background-position forces a full repaint of the section every frame, which was
   measured to cause severe scroll jank (see docs/superpowers/plans for the fix notes). */
.mesh-bg {
  background: var(--void);
  overflow: hidden;
}

.mesh-bg::before {
  content: '';
  position: absolute;
  inset: -20%;
  z-index: -1;
  background:
    radial-gradient(circle at 20% 20%, var(--signal-violet-soft), transparent 55%),
    radial-gradient(circle at 80% 60%, rgba(245, 166, 35, 0.08), transparent 50%);
  animation: mesh-drift 18s ease-in-out infinite alternate;
  will-change: transform;
}

@keyframes mesh-drift {
  from { transform: translate(0%, 0%); }
  to { transform: translate(4%, 3%); }
}

.problem-content { max-width: 720px; margin: 0 auto; text-align: center; }

.citation-card {
  display: inline-block;
  margin-top: 32px;
  padding: 20px 28px;
  background: var(--paper);
  color: var(--ink);
  border-radius: var(--radius-md);
  transform: rotate(-1.5deg);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.35);
}

.citation-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #6b6a5f;
  display: block;
  margin-bottom: 6px;
}

.citation-stat {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 700;
  margin: 0;
  color: var(--ink);
}

/* How it works */
.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

.step {
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  background: var(--void);
}

.step-index {
  font-family: var(--font-mono);
  color: var(--signal-ember);
  font-size: 13px;
  letter-spacing: 0.08em;
  margin-bottom: 16px;
  display: block;
}

.step h3 { font-size: 19px; margin-bottom: 8px; }
.step p { font-size: 15px; margin: 0; }

/* Features grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

.feature-card {
  --rotate-x: 0deg;
  --rotate-y: 0deg;
  --glow-x: 50%;
  --glow-y: 50%;
  position: relative;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  background: var(--void);
  transform: perspective(800px) rotateX(var(--rotate-x)) rotateY(var(--rotate-y));
  transition: transform var(--transition-base), border-color var(--transition-base);
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(180px circle at var(--glow-x) var(--glow-y), var(--signal-violet-soft), transparent 70%);
  opacity: 0;
  transition: opacity var(--transition-base);
  pointer-events: none;
}

.feature-card:hover { border-color: var(--signal-violet); }
.feature-card:hover::before { opacity: 1; }

.feature-tag {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--signal-ember);
  display: inline-block;
  margin-bottom: 16px;
}

.feature-card h3 { font-size: 19px; margin-bottom: 8px; }
.feature-card p { font-size: 15px; margin: 0; }

/* Final CTA */
.final-cta { text-align: center; }

.final-cta-card {
  max-width: 720px;
  margin: 0 auto;
  padding: 64px 48px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background: linear-gradient(160deg, var(--void), var(--ink));
}

.final-cta h2 { font-size: clamp(2rem, 4vw, 2.6rem); margin-bottom: 16px; }

/* Footer */
.footer {
  border-top: 1px solid var(--border);
  padding: 40px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--mist);
}

/* Responsive */
@media (max-width: 900px) {
  .steps, .features-grid { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .hero { padding: 100px 20px 60px; }
  section { padding: 80px 0; }
  .nav { padding: 16px 20px; }
  .footer { flex-direction: column; gap: 12px; text-align: center; }
}

/* Touch: disable tilt/glow (JS also guards this via matchMedia) */
@media (hover: none) {
  .feature-card { transform: none !important; }
  .feature-card::before { display: none; }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .mesh-bg::before { animation: none; }
  [data-reveal] { transition: none; }
  .btn-primary:hover, .feature-card { transition: none; }
}