* { box-sizing: border-box; }

:root {
  /* Color Palette */
  --bg: #09090E; /* Deep dark cosmic void */
  --alt: #0D0D14; /* Slightly lighter dark */
  --text: #F8FAFC; /* High contrast off-white */
  --muted: #94A3B8; /* Slate gray */
  --line: rgba(255, 255, 255, 0.08); /* Soft semi-transparent borders */
  
  /* Gradients */
  --accent-gradient: linear-gradient(135deg, #00f2fe 0%, #4facfe 100%);
  --accent-dark: #38bdf8;
  
  /* Glassmorphism */
  --glass-bg: rgba(255, 255, 255, 0.03);
  --glass-border: 1px solid rgba(255, 255, 255, 0.08);
  --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
  --glass-blur: blur(16px);
  
  /* Layout */
  --max: 1180px;
}

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: 'Inter', ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent-dark); text-decoration: none; transition: color 0.2s ease; }
a:hover { color: #7dd3fc; }

.container {
  width: min(var(--max), calc(100% - 40px));
  margin: 0 auto;
}
.narrow { max-width: 860px; }

/* Hero Section Makeover */
.hero {
  padding: 120px 0 90px;
  border-bottom: var(--glass-border);
  background: radial-gradient(circle at 15% 50%, rgba(0, 242, 254, 0.08), transparent 40%),
              radial-gradient(circle at 85% 30%, rgba(79, 172, 254, 0.12), transparent 40%),
              var(--bg);
  position: relative;
  overflow: hidden;
}

.hero::after {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: url('data:image/svg+xml;utf8,<svg width="20" height="20" xmlns="http://www.w3.org/2000/svg"><circle cx="2" cy="2" r="1" fill="rgba(255,255,255,0.03)"/></svg>') repeat;
  pointer-events: none;
}

.eyebrow, .card-kicker, .claim-title {
  text-transform: uppercase;
  letter-spacing: 0.15em;
  font-size: 0.8rem;
  font-weight: 700;
  color: #38bdf8;
}

h1, h2, h3, h4, h5 {
  font-family: 'Outfit', sans-serif;
  font-weight: 700;
}

h1 {
  max-width: 1050px;
  margin: 16px auto 24px;
  text-align: center;
  font-size: clamp(2.5rem, 5vw, 4.2rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  background: linear-gradient(to right, #ffffff 30%, #a5b4fc 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero .eyebrow, .hero .tagline, .authors, .affiliations, .button-row {
  text-align: center;
  position: relative;
  z-index: 2;
}

.tagline {
  margin: 24px 0 32px;
  font-size: clamp(1.2rem, 2vw, 1.8rem);
  color: var(--muted);
  font-weight: 400;
}

.authors {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px 24px;
  font-size: 1.1rem;
  font-weight: 500;
  color: #cbd5e1;
}

.affiliations {
  margin: 12px 0 32px;
  color: var(--muted);
  font-size: 0.95rem;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: 12px;
  color: var(--text);
  background: rgba(255,255,255,0.05);
  font-weight: 600;
  font-family: 'Outfit', sans-serif;
  backdrop-filter: blur(10px);
  transition: all 0.3s ease;
}

.button:hover {
  background: rgba(255,255,255,0.1);
  transform: translateY(-2px);
  box-shadow: 0 10px 20px rgba(0,0,0,0.2);
}

.button.primary {
  background: var(--accent-gradient);
  border: none;
  color: #000;
}

.button.primary:hover {
  box-shadow: 0 0 20px rgba(0, 242, 254, 0.4);
}

.section { padding: 90px 0; }
.section.alt { background: var(--alt); border-top: var(--glass-border); border-bottom: var(--glass-border); }

h2 {
  margin: 0 0 28px;
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: #f1f5f9;
}

h3 { margin-top: 12px; font-size: 1.4rem; color: #f8fafc; }

.lead {
  max-width: 850px;
  font-size: 1.25rem;
  color: var(--muted);
  line-height: 1.7;
}

/* Glassmorphism Cards */
.claim-card, .card, .metric, .stats > div, .audio-card, .feature-block {
  background: var(--glass-bg);
  border: var(--glass-border);
  border-radius: 20px;
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  padding: 32px;
  box-shadow: var(--glass-shadow);
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.card:hover, .metric:hover, .audio-card:hover, .claim-card:hover {
  transform: translateY(-5px);
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(255, 255, 255, 0.15);
  box-shadow: 0 20px 40px rgba(0,0,0,0.4);
}

.claim-card p { margin-bottom: 0; font-size: 1.2rem; color: #cbd5e1; }

.three-col {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

/* Images */
.figure-block { margin-top: 32px; }
.figure-block img, .feature-block img {
  width: 100%;
  height: auto;
  display: block;
  border: var(--glass-border);
  border-radius: 16px;
  background: #fff; /* White background to support plots with transparent axes */
  box-shadow: 0 10px 30px rgba(0,0,0,0.5);
  transition: transform 0.4s ease;
}
.figure-block img:hover, .feature-block img:hover {
  transform: scale(1.01);
}

/* Feature Block Grid (Side by side) */
.two-column-sections {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 32px;
  align-items: stretch;
}
.feature-block {
  min-width: 0;
  display: flex;
  flex-direction: column;
}
.feature-block h2 {
  margin-bottom: 16px;
}
.feature-block p {
  color: var(--muted);
  font-size: 1.1rem;
  line-height: 1.6;
  margin-bottom: 24px;
}
.feature-block img {
  margin-top: auto;
  margin-bottom: 0;
}

.caption {
  max-width: 900px;
  margin: 16px auto 0;
  color: var(--muted);
  font-size: 1rem;
  text-align: center;
}

/* Metrics Grid */
.metrics-grid, .stats, .audio-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 40px;
}

.metric.accent {
  background: linear-gradient(180deg, rgba(0, 242, 254, 0.05) 0%, rgba(255,255,255,0.02) 100%);
  border-color: rgba(0, 242, 254, 0.3);
  position: relative;
}
.metric.accent::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: var(--accent-gradient);
  border-radius: 20px 20px 0 0;
}

.metric-name { font-weight: 600; color: #cbd5e1; }
.metric-value {
  margin: 12px 0 4px;
  font-size: 2.5rem;
  font-family: 'Outfit', sans-serif;
  font-weight: 800;
  background: linear-gradient(to right, #fff, #94a3b8);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.metric.accent .metric-value {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.metric-label { color: var(--muted); font-size: 0.9rem; text-transform: uppercase; letter-spacing: 0.05em; }

.stats strong {
  display: block;
  font-size: 1.8rem;
  font-family: 'Outfit', sans-serif;
  font-weight: 700;
  margin-bottom: 8px;
  color: #f1f5f9;
}
.stats span { color: var(--muted); font-size: 0.95rem; }

audio {
  width: 100%;
  margin-top: 16px;
  border-radius: 8px;
  /* Soft filter to make audio player fit dark mode better */
  filter: invert(90%) hue-rotate(180deg);
}

.citation {
  overflow-x: auto;
  padding: 24px;
  border-radius: 16px;
  background: #000;
  border: 1px solid rgba(255,255,255,0.1);
  color: #a5b4fc;
  font-size: 0.95rem;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

footer {
  padding: 40px 0 60px;
  color: var(--muted);
  border-top: var(--glass-border);
  text-align: center;
  background: var(--bg);
}

@media (max-width: 900px) {
  .three-col, .metrics-grid, .stats, .audio-grid, .two-column-sections {
    grid-template-columns: 1fr;
  }
  .hero { padding-top: 80px; }
  .feature-block img { width: 100% !important; margin: 16px 0 0 0; }
}