/* ===== CSS Variables — Cool Slate Theme ===== */
:root {
  --bg: #f8fafc;
  --card: #f1f5f9;
  --border: #cbd5e1;
  --teal: #0d9488;
  --teal-light: #2dd4bf;
  --teal-dark: #0f766e;
  --gold: #b45309;
  --text-primary: #0f172a;
  --text-muted: #475569;
  --font: 'Inter', system-ui, -apple-system, sans-serif;
  --mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;
  --max-width: 1200px;
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 16px;
}

/* ===== Reset ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; scroll-padding-top: 80px; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text-muted);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
a { color: var(--teal); text-decoration: none; transition: color .2s; }
a:hover { color: var(--teal-dark); }
img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }
button { font-family: var(--font); cursor: pointer; border: none; background: none; }

/* ===== Typography ===== */
h1, h2, h3, h4 { color: var(--text-primary); font-weight: 700; line-height: 1.2; }
h1 { font-size: clamp(2.2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.6rem, 3vw, 2.4rem); }
h3 { font-size: 1.15rem; }
.section-label {
  text-transform: uppercase;
  font-size: .75rem;
  font-weight: 600;
  letter-spacing: 2px;
  color: var(--teal);
  margin-bottom: .5rem;
}
.section-title { margin-bottom: 1rem; }
.section-subtitle {
  max-width: 600px;
  margin: 0 auto 3rem;
  text-align: center;
}

/* ===== Layout ===== */
.container { width: 100%; max-width: var(--max-width); margin: 0 auto; padding: 0 1.5rem; }
section { padding: 5rem 0; }

/* ===== Scroll Progress Bar ===== */
.scroll-progress {
  position: fixed; top: 0; left: 0; height: 3px; z-index: 1100;
  background: linear-gradient(90deg, var(--teal), var(--teal-light));
  width: 0%;
  transition: width .1s linear;
}

/* ===== Back to Top ===== */
.back-to-top {
  position: fixed; bottom: 2rem; right: 2rem; z-index: 1000;
  width: 44px; height: 44px; border-radius: 50%;
  background: var(--teal); color: #fff;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 4px 20px rgba(13, 148, 136, .3);
  opacity: 0; transform: translateY(20px);
  transition: opacity .3s, transform .3s;
  cursor: pointer;
}
.back-to-top.visible { opacity: 1; transform: translateY(0); }
.back-to-top:hover { background: var(--teal-dark); transform: translateY(-2px); }
.back-to-top svg { width: 20px; height: 20px; }

/* ===== Navbar ===== */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  padding: 1rem 0;
  transition: background .3s, backdrop-filter .3s, box-shadow .3s;
}
.navbar.scrolled {
  background: rgba(248, 250, 252, .92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 1px 3px rgba(0, 0, 0, .06);
}
.navbar .container { display: flex; align-items: center; justify-content: space-between; }
.nav-brand { display: flex; align-items: center; gap: .5rem; font-weight: 700; font-size: 1.2rem; color: var(--text-primary); }
.nav-brand img { height: 32px; width: auto; }
.nav-links { display: flex; align-items: center; gap: 2rem; }
.nav-links a {
  color: var(--text-muted); font-size: .9rem; font-weight: 500; transition: color .2s;
  position: relative;
}
.nav-links a:not(.gh-link):not(.lang-toggle)::after {
  content: '';
  position: absolute; bottom: -2px; left: 0; width: 0; height: 2px;
  background: var(--teal);
  transition: width .3s ease;
}
.nav-links a:not(.gh-link):not(.lang-toggle):hover::after { width: 100%; }
.nav-links a:hover { color: var(--text-primary); }
.nav-links .gh-link {
  display: inline-flex; align-items: center; gap: .4rem;
  padding: .45rem 1rem; border: 1px solid var(--border); border-radius: var(--radius-sm);
  font-size: .85rem;
}
.nav-links .gh-link:hover { border-color: var(--teal); color: var(--teal); }
.hamburger { display: none; flex-direction: column; gap: 5px; }
.hamburger span { display: block; width: 24px; height: 2px; background: var(--text-primary); transition: transform .3s, opacity .3s; }

/* ===== Hero ===== */
.hero {
  min-height: 70vh; display: flex; align-items: center;
  position: relative; overflow: hidden;
  padding-top: 5rem; padding-bottom: 3rem;
}

/* Animated gradient mesh background */
.hero-bg {
  position: absolute; inset: 0; z-index: 0;
  background: var(--bg);
}
.hero-bg::before,
.hero-bg::after,
.hero-bg .hero-bg-layer {
  content: '';
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: .5;
}
.hero-bg::before {
  width: 600px; height: 600px;
  top: -10%; left: -5%;
  background: radial-gradient(circle, rgba(13, 148, 136, .12), transparent 70%);
  animation: meshMove1 20s ease-in-out infinite;
}
.hero-bg::after {
  width: 500px; height: 500px;
  top: 20%; right: -10%;
  background: radial-gradient(circle, rgba(45, 212, 191, .1), transparent 70%);
  animation: meshMove2 25s ease-in-out infinite;
}
.hero-bg .hero-bg-layer {
  width: 450px; height: 450px;
  bottom: -5%; left: 40%;
  background: radial-gradient(circle, rgba(13, 148, 136, .08), transparent 70%);
  animation: meshMove3 22s ease-in-out infinite;
}

@keyframes meshMove1 {
  0%, 100% { transform: translate(0, 0); }
  25% { transform: translate(80px, 40px); }
  50% { transform: translate(40px, 80px); }
  75% { transform: translate(-40px, 40px); }
}
@keyframes meshMove2 {
  0%, 100% { transform: translate(0, 0); }
  25% { transform: translate(-60px, 50px); }
  50% { transform: translate(-30px, -40px); }
  75% { transform: translate(40px, 20px); }
}
@keyframes meshMove3 {
  0%, 100% { transform: translate(0, 0); }
  33% { transform: translate(60px, -30px); }
  66% { transform: translate(-40px, 50px); }
}

/* Floating particles */
.hero-particles {
  position: absolute; inset: 0; z-index: 0;
  overflow: hidden; pointer-events: none;
}
.hero-particles .particle {
  position: absolute;
  width: 4px; height: 4px;
  border-radius: 50%;
  background: var(--teal);
  opacity: 0;
  animation: particleFloat linear infinite;
}

@keyframes particleFloat {
  0% { opacity: 0; transform: translateY(100vh) scale(0); }
  10% { opacity: .4; transform: translateY(80vh) scale(1); }
  90% { opacity: .2; transform: translateY(-10vh) scale(.5); }
  100% { opacity: 0; transform: translateY(-20vh) scale(0); }
}

.hero .container { position: relative; z-index: 1; display: flex; flex-direction: column; align-items: center; text-align: center; will-change: transform; }
.hero-content { display: flex; flex-direction: column; gap: 1.5rem; align-items: center; }

/* Staggered entrance */
.hero-brand {
  display: flex; align-items: center; gap: .75rem;
  opacity: 0; animation: heroFadeUp .8s ease forwards;
  animation-delay: .1s;
}
.hero-logo {
  width: 150px; height: auto;
}
.hero-brand-name {
  font-size: 2.4rem; font-weight: 700; color: var(--text-primary);
  letter-spacing: -0.5px;
}
.hero h1 {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  opacity: 0; animation: heroFadeUp .8s ease forwards;
  animation-delay: .3s;
}
.hero-accent {
  font-size: 1.4rem; font-weight: 600; color: var(--text-primary); max-width: 480px;
}
.hero-subtitle {
  font-size: 1rem; color: var(--text-muted); line-height: 1.65; max-width: 540px; margin-top: 1.5rem;
  opacity: 0; animation: heroFadeUp .8s ease forwards;
  animation-delay: .5s;
}
.hero-tagline {
  font-size: 1.05rem; color: var(--text-muted); max-width: 480px;
  opacity: 0; animation: heroFadeUp .8s ease forwards;
  animation-delay: .65s;
}
.hero-cta {
  display: flex; flex-direction: column; gap: .75rem; align-items: center;
  opacity: 0; animation: heroFadeUp .8s ease forwards;
  animation-delay: .7s;
}
.hero-cta-row { display: flex; gap: 1rem; flex-wrap: wrap; justify-content: center; }
.hero-terminal-wrap {
  opacity: 0; animation: heroFadeUp .8s ease forwards;
  animation-delay: .9s;
}

@keyframes heroFadeUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Gradient text */
.gradient-text {
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--teal) 50%, var(--teal-light) 100%);
  background-size: 200% 200%;
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: gradientShift 6s ease-in-out infinite;
}

@keyframes gradientShift {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

/* Buttons */
.btn {
  display: inline-flex; align-items: center; gap: .5rem;
  padding: .75rem 1.5rem; border-radius: var(--radius-sm);
  font-weight: 600; font-size: .95rem;
  transition: transform .15s, box-shadow .2s, background .2s, border-color .2s;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary {
  background: var(--teal); color: #fff;
  box-shadow: 0 2px 10px rgba(13, 148, 136, .15);
  position: relative; overflow: hidden;
}
.btn-primary::after {
  content: '';
  position: absolute; top: 0; left: -100%; width: 60%; height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,.25), transparent);
  transition: none;
}
.btn-primary:hover::after {
  animation: btnShimmer .6s ease forwards;
}
@keyframes btnShimmer {
  to { left: 120%; }
}
.btn-primary:hover {
  background: var(--teal-dark);
  box-shadow: 0 6px 24px rgba(13, 148, 136, .3);
}
/* Hero CTA shimmer loop */
.hero-cta .btn-primary::after {
  animation: btnShimmerLoop 3s ease-in-out infinite;
}
@keyframes btnShimmerLoop {
  0%, 100% { left: -100%; }
  40% { left: 120%; }
  41%, 99% { left: -100%; }
}
.btn-outline { border: 1px solid var(--border); color: var(--text-primary); }
.btn-outline:hover { border-color: var(--teal); color: var(--teal); }

/* Terminal (dark) */
.hero-terminal {
  background: #0f172a; border: 1px solid #1e293b; border-radius: var(--radius);
  overflow: hidden; font-family: var(--mono); font-size: .85rem;
  box-shadow:
    0 20px 60px rgba(0, 0, 0, .12),
    0 0 0 1px rgba(45, 212, 191, 0);
  animation: terminalGlow 4s ease-in-out infinite;
}

@keyframes terminalGlow {
  0%, 100% { box-shadow: 0 20px 60px rgba(0, 0, 0, .12), 0 0 0 1px rgba(45, 212, 191, 0); }
  50% { box-shadow: 0 20px 60px rgba(0, 0, 0, .15), 0 0 30px rgba(45, 212, 191, .08); }
}

.terminal-bar {
  display: flex; align-items: center; gap: 6px;
  padding: .6rem 1rem; background: #1e293b; border-bottom: 1px solid #334155;
}
.terminal-dot { width: 10px; height: 10px; border-radius: 50%; }
.terminal-dot.red { background: #ff5f56; }
.terminal-dot.yellow { background: #ffbd2e; }
.terminal-dot.green { background: #27c93f; }
.terminal-bar span { margin-left: .5rem; font-size: .75rem; color: #94a3b8; }
.terminal-body { padding: 1.2rem; line-height: 1.8; min-height: 220px; }
.terminal-body .prompt { color: #2dd4bf; }
.terminal-body .command { color: #e2e8f0; }
.terminal-body .output { color: #94a3b8; }
.terminal-body .highlight { color: #fbbf24; }
.terminal-body .cursor {
  display: inline-block; width: 8px; height: 1.1em;
  background: #2dd4bf; vertical-align: text-bottom;
  animation: blink 1s step-end infinite;
}
@keyframes blink { 50% { opacity: 0; } }

/* ===== Features (Glass morphism) ===== */
.features-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.5rem;
}
.feature-card {
  background: rgba(241, 245, 249, .6);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid rgba(203, 213, 225, .5);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: transform .25s, border-color .3s, box-shadow .3s;
  position: relative;
  overflow: hidden;
}
.feature-card::before {
  content: '';
  position: absolute; inset: 0;
  border-radius: var(--radius);
  padding: 1px;
  background: linear-gradient(135deg, transparent, transparent);
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  transition: background .3s;
  pointer-events: none;
}
.feature-card:hover {
  transform: translateY(-4px);
  border-color: transparent;
  box-shadow: 0 8px 30px rgba(13, 148, 136, .1);
}
.feature-card:hover::before {
  background: linear-gradient(135deg, var(--teal), var(--teal-light));
}
.feature-icon {
  width: 44px; height: 44px; margin-bottom: 1rem;
  display: flex; align-items: center; justify-content: center;
  border-radius: var(--radius-sm);
  background: rgba(13, 148, 136, .1);
  transition: transform .3s;
}
.feature-card:hover .feature-icon { transform: scale(1.1) rotate(5deg); }
.feature-icon svg {
  width: 22px; height: 22px;
  stroke: var(--teal); fill: none; stroke-width: 1.5;
  stroke-linecap: round; stroke-linejoin: round;
}
.feature-card h3 { margin-bottom: .5rem; font-size: 1rem; }
.feature-card p { font-size: .875rem; }

/* ===== Stats Bar ===== */
.stats-bar {
  padding: 3rem 0;
  background: linear-gradient(180deg, transparent, rgba(13, 148, 136, .03), transparent);
}
.stats-grid {
  display: flex; justify-content: center; align-items: center;
  gap: 0; flex-wrap: wrap;
}
.stat-item {
  text-align: center; padding: 1.5rem 3rem;
  position: relative;
}
.stat-item:not(:last-child)::after {
  content: '';
  position: absolute; right: 0; top: 20%; height: 60%;
  width: 1px;
  background: linear-gradient(180deg, transparent, var(--border), transparent);
}
.stat-number {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  color: var(--teal);
  line-height: 1;
  margin-bottom: .25rem;
}
.stat-label {
  font-size: .85rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* ===== Pipeline (Animated) ===== */
.pipeline-phases {
  display: grid; grid-template-columns: 1fr auto 1fr auto 1fr; gap: 0;
  margin-bottom: 3rem;
  position: relative;
  align-items: center;
}
.phase-card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 1.5rem; text-align: center; position: relative;
  z-index: 1;
  opacity: 0; transform: translateY(20px);
  transition: opacity .6s ease, transform .6s ease, border-color .3s, box-shadow .3s;
}
.phase-card.active {
  opacity: 1; transform: translateY(0);
  border-color: var(--teal);
  box-shadow: 0 4px 20px rgba(13, 148, 136, .1);
}
.phase-card.visible {
  opacity: 1; transform: translateY(0);
}
.phase-number {
  display: inline-flex; align-items: center; justify-content: center;
  width: 40px; height: 40px; border-radius: 50%;
  background: rgba(13, 148, 136, .1); color: var(--teal);
  font-weight: 700; font-size: .9rem; margin-bottom: .75rem;
  transition: background .3s, color .3s;
}
.phase-card.active .phase-number {
  background: var(--teal); color: #fff;
}
.phase-card h3 { margin-bottom: .5rem; }
.phase-card p { font-size: .875rem; }

/* Pipeline arrows (SVG) */
.pipeline-arrow-container {
  position: relative; margin-bottom: 3rem;
}
.pipeline-arrow-svg {
  position: absolute; top: 50%; left: 0; width: 100%; height: 40px;
  transform: translateY(-50%);
  pointer-events: none; z-index: 0;
}
.pipeline-arrow-svg line {
  stroke: var(--teal);
  stroke-width: 2;
  stroke-dasharray: 8 4;
  animation: dashFlow 1.5s linear infinite;
}
@keyframes dashFlow {
  to { stroke-dashoffset: -24; }
}

/* Animated connecting arrows between phase cards */
.phase-connector {
  display: flex; align-items: center; justify-content: center;
  padding: 0 .5rem;
}
.phase-connector svg {
  width: 60px; height: 24px;
  overflow: visible;
}
.phase-connector .arrow-line {
  stroke: var(--teal); stroke-width: 2; fill: none;
  stroke-dasharray: 60;
  stroke-dashoffset: 60;
  transition: stroke-dashoffset 1s ease;
}
.phase-connector.animated .arrow-line {
  stroke-dashoffset: 0;
}
.phase-connector .arrow-dot {
  fill: var(--teal);
  r: 3;
  opacity: 0;
}
.phase-connector.animated .arrow-dot {
  animation: dotFlow 2s ease-in-out infinite;
}
@keyframes dotFlow {
  0% { opacity: 0; cx: 0; }
  20% { opacity: 1; }
  80% { opacity: 1; }
  100% { opacity: 0; cx: 56; }
}

/* Review loop */
.review-loop {
  max-width: 900px; margin: 0 auto 2rem;
  position: relative;
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius-lg);
  padding: 2.5rem 2rem;
}
.review-loop-header { text-align: center; margin-bottom: 1.5rem; }
.review-loop-title {
  color: var(--text-primary); font-size: 1.2rem; margin: 0;
}
.loop-steps {
  display: flex; align-items: stretch; justify-content: center; gap: 0;
  flex-wrap: wrap;
}
.loop-step {
  display: flex; align-items: center; gap: .75rem;
  padding: 1rem 1.5rem; background: #fff; border: 1px solid var(--border);
  border-radius: var(--radius); color: var(--text-primary);
  white-space: nowrap;
  transition: border-color .3s, box-shadow .3s, transform .3s;
}
.loop-step.active {
  border-color: var(--teal);
  box-shadow: 0 0 20px rgba(13, 148, 136, .12);
  transform: scale(1.04);
}
.loop-step-icon {
  width: 40px; height: 40px; min-width: 40px;
  display: flex; align-items: center; justify-content: center;
  border-radius: var(--radius-sm); background: rgba(13, 148, 136, .1);
}
.loop-step-icon svg { width: 20px; height: 20px; stroke: var(--teal); fill: none; stroke-width: 1.5; stroke-linecap: round; stroke-linejoin: round; }
.loop-step-text { display: flex; flex-direction: column; gap: .1rem; }
.loop-step-text strong { font-size: .95rem; }
.loop-step-text span { font-size: .75rem; color: var(--text-muted); white-space: nowrap; }
.loop-arrow { color: var(--teal); font-size: 1.4rem; padding: 0 .6rem; flex-shrink: 0; display: flex; align-items: center; }
.loop-repeat { opacity: .5; font-size: 1.6rem; }

/* Inline loop steps */
.loop-steps-inline {
  display: flex; align-items: center; justify-content: center;
  flex-wrap: nowrap; gap: .4rem;
  padding: 1.5rem 0 .5rem;
}
.loop-inline-step {
  display: inline-flex; align-items: center; gap: .4rem;
  padding: .55rem 1.1rem;
  background: var(--card); border: 1px solid var(--border);
  border-radius: 999px; font-size: .95rem; font-weight: 600;
  color: var(--text-primary); white-space: nowrap; flex-shrink: 0;
  box-shadow: 0 1px 4px rgba(0,0,0,.06);
}
.loop-step-icon { font-size: 1rem; line-height: 1; }
.loop-inline-arr { color: var(--border); font-size: 1rem; flex-shrink: 0; }
.loop-inline-arr.loop-repeat { color: var(--teal); opacity: .7; font-size: 1.4rem; }

/* ===== Agents ===== */
.agents-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.2rem;
}
.agent-card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 1.2rem; display: flex; align-items: flex-start; gap: 1rem;
  transition: transform .25s, border-color .25s, box-shadow .25s;
}
.agent-card:hover { transform: translateY(-3px); }
.agent-icon {
  width: 40px; height: 40px; min-width: 40px; border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  transition: transform .3s;
}
.agent-card:hover .agent-icon { transform: scale(1.15); }
.agent-icon svg { width: 20px; height: 20px; fill: none; stroke-width: 1.5; stroke-linecap: round; stroke-linejoin: round; }
.agent-info h3 { font-size: .9rem; margin-bottom: .25rem; }
.agent-info p { font-size: .8rem; line-height: 1.4; }

/* Agent colours + hover glow */
.agent-reviewer .agent-icon { background: rgba(59, 130, 246, .1); }
.agent-reviewer svg { stroke: #2563eb; }
.agent-reviewer:hover { border-color: rgba(59, 130, 246, .4); box-shadow: 0 8px 24px rgba(59, 130, 246, .12); }
.agent-planner .agent-icon { background: rgba(13, 148, 136, .1); }
.agent-planner svg { stroke: #0d9488; }
.agent-planner:hover { border-color: rgba(13, 148, 136, .4); box-shadow: 0 8px 24px rgba(13, 148, 136, .12); }
.agent-writer .agent-icon { background: rgba(22, 163, 74, .1); }
.agent-writer svg { stroke: #16a34a; }
.agent-writer:hover { border-color: rgba(22, 163, 74, .4); box-shadow: 0 8px 24px rgba(22, 163, 74, .12); }
.agent-experimenter .agent-icon { background: rgba(147, 51, 234, .1); }
.agent-experimenter svg { stroke: #9333ea; }
.agent-experimenter:hover { border-color: rgba(147, 51, 234, .4); box-shadow: 0 8px 24px rgba(147, 51, 234, .12); }
.agent-researcher .agent-icon { background: rgba(234, 88, 12, .1); }
.agent-researcher svg { stroke: #ea580c; }
.agent-researcher:hover { border-color: rgba(234, 88, 12, .4); box-shadow: 0 8px 24px rgba(234, 88, 12, .12); }
.agent-visualizer .agent-icon { background: rgba(180, 83, 9, .1); }
.agent-visualizer svg { stroke: #b45309; }
.agent-visualizer:hover { border-color: rgba(180, 83, 9, .4); box-shadow: 0 8px 24px rgba(180, 83, 9, .12); }
.agent-debugger .agent-icon { background: rgba(220, 38, 38, .1); }
.agent-debugger svg { stroke: #dc2626; }
.agent-debugger:hover { border-color: rgba(220, 38, 38, .4); box-shadow: 0 8px 24px rgba(220, 38, 38, .12); }
.agent-coder .agent-icon { background: rgba(22, 163, 74, .1); }
.agent-coder svg { stroke: #16a34a; }
.agent-coder:hover { border-color: rgba(22, 163, 74, .4); box-shadow: 0 8px 24px rgba(22, 163, 74, .12); }

/* Agent icon pulse */
@keyframes iconPulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.08); }
}
.agent-icon { animation: iconPulse 3s ease-in-out infinite; }
.agent-card:nth-child(2) .agent-icon { animation-delay: .4s; }
.agent-card:nth-child(3) .agent-icon { animation-delay: .8s; }
.agent-card:nth-child(4) .agent-icon { animation-delay: 1.2s; }
.agent-card:nth-child(5) .agent-icon { animation-delay: 1.6s; }
.agent-card:nth-child(6) .agent-icon { animation-delay: 2s; }
.agent-card:nth-child(7) .agent-icon { animation-delay: 2.4s; }
.agent-card:nth-child(8) .agent-icon { animation-delay: 2.8s; }

/* ===== Papers ===== */
.papers-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 2rem;
}
.paper-card {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  overflow: hidden;
  transition: transform .4s, box-shadow .4s;
  position: relative;
  transform-style: preserve-3d;
  perspective: 800px;
}
.paper-card:hover { box-shadow: 0 20px 50px rgba(0, 0, 0, .1); }
a.paper-card-img, .paper-card-img {
  display: block; position: relative; overflow: hidden;
  border-bottom: 1px solid var(--border);
}
.paper-card-img img {
  width: 100%; aspect-ratio: 4/3; object-fit: cover;
  transition: transform .4s ease;
}
.paper-card:hover .paper-card-img img { transform: scale(1.03); }
.paper-badge {
  position: absolute; top: .75rem; right: .75rem;
  padding: .3rem .7rem;
  background: rgba(13, 148, 136, .9); color: #fff;
  border-radius: 999px; font-size: .7rem; font-weight: 600;
  backdrop-filter: blur(4px);
}
.paper-card-body { padding: 1.5rem; }
.paper-card-body h3 { margin-bottom: .5rem; font-size: 1rem; }
.paper-card-body .paper-meta { font-size: .8rem; color: var(--text-muted); margin-bottom: 1rem; }
.paper-card-body .btn { font-size: .85rem; padding: .5rem 1rem; margin-right: .5rem; }

/* ===== Quick Start ===== */
.quickstart { background: linear-gradient(180deg, transparent, rgba(13, 148, 136, .03), transparent); }
.quickstart-terminal {
  max-width: 680px; margin: 0 auto 2rem;
  background: #0f172a; border: 1px solid #1e293b; border-radius: var(--radius);
  overflow: hidden; position: relative;
  box-shadow: 0 20px 60px rgba(0, 0, 0, .12);
  animation: terminalGlow 4s ease-in-out infinite;
}
.quickstart-terminal .terminal-bar { justify-content: space-between; }

/* Copy button */
.copy-btn {
  display: flex; align-items: center; gap: .3rem;
  padding: .3rem .6rem; border-radius: var(--radius-sm);
  font-size: .75rem; color: #94a3b8; border: 1px solid #334155;
  transition: color .2s, border-color .2s;
  font-family: var(--font);
}
.copy-btn:hover { color: #2dd4bf; border-color: #2dd4bf; }
.copy-btn svg { width: 14px; height: 14px; stroke: currentColor; fill: none; stroke-width: 2; }
.copy-btn .checkmark-path {
  stroke-dasharray: 24;
  stroke-dashoffset: 24;
  animation: drawCheck .4s ease forwards;
}
@keyframes drawCheck {
  to { stroke-dashoffset: 0; }
}

.quickstart-terminal pre {
  padding: 1.2rem; margin: 0; font-family: var(--mono);
  font-size: .85rem; line-height: 2; overflow-x: auto; color: #e2e8f0;
}
.quickstart-terminal .comment { color: #94a3b8; }
.quickstart-terminal .cmd { color: #2dd4bf; transition: background .3s; border-radius: 2px; }
.quickstart-terminal .cmd.highlight-line { background: rgba(45, 212, 191, .1); }
.option-badges { display: flex; justify-content: center; gap: 1rem; flex-wrap: wrap; }
.option-badge {
  padding: .4rem 1rem; border: 1px solid var(--border); border-radius: 999px;
  font-size: .8rem; color: var(--text-muted); font-family: var(--mono);
  transition: border-color .2s, color .2s;
}
.option-badge:hover { border-color: var(--teal); color: var(--teal); }

/* ===== Venues ===== */
.venues { padding: 3rem 0; overflow: hidden; }
.venues-scroll {
  position: relative;
  overflow: hidden;
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent);
  mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent);
}
.venues-track {
  display: flex;
  animation: scrollVenues 35s linear infinite;
  width: max-content;
}
.venues-track:hover { animation-play-state: paused; }
.venues-track-reverse {
  display: flex; gap: 1rem;
  animation: scrollVenuesReverse 30s linear infinite;
  width: max-content;
  margin-top: .75rem;
}
.venues-track-reverse:hover { animation-play-state: paused; }
.venue-badge {
  padding: .5rem 1.2rem; background: var(--card); border: 1px solid var(--border);
  border-radius: 999px; font-size: .85rem; font-weight: 600; color: var(--text-primary);
  white-space: nowrap; flex-shrink: 0; margin-right: 1rem;
  transition: border-color .2s, transform .2s;
}
.venue-badge:hover { border-color: var(--teal); transform: scale(1.05); }

@keyframes scrollVenues {
  0% { transform: translateX(0); }
  100% { transform: translateX(-33.333%); }
}
@keyframes scrollVenuesReverse {
  0% { transform: translateX(-50%); }
  100% { transform: translateX(0); }
}

/* ===== Team ===== */
.team-content {
  max-width: 600px; margin: 0 auto; text-align: center;
}
.team-content p { margin-bottom: 1.5rem; }

/* ===== Roadmap ===== */
.roadmap-timeline {
  max-width: 600px; margin: 0 auto; position: relative;
  padding-left: 2rem;
}
.roadmap-timeline::before {
  content: ''; position: absolute; left: 7px; top: 0; bottom: 0;
  width: 2px; background: var(--border);
}
/* Animated drawing line */
.roadmap-line {
  position: absolute; left: 7px; top: 0;
  width: 2px; height: 0;
  background: linear-gradient(180deg, var(--teal), var(--teal-light));
  transition: height .6s ease;
  z-index: 1;
}
.roadmap-item {
  position: relative; margin-bottom: 2rem; padding-left: 1.5rem;
  opacity: 0; transform: translateX(-20px);
  transition: opacity .5s ease, transform .5s ease;
}
.roadmap-item.visible { opacity: 1; transform: translateX(0); }
.roadmap-item::before {
  content: ''; position: absolute; left: -2rem; top: .35rem;
  width: 16px; height: 16px; border-radius: 50%;
  background: var(--bg); border: 2px solid var(--border);
  z-index: 2;
  transition: border-color .3s, box-shadow .3s;
}
.roadmap-item.visible::before {
  border-color: var(--teal);
  box-shadow: 0 0 0 4px rgba(13, 148, 136, .15);
  animation: roadmapPulse 2s ease-in-out;
}
@keyframes roadmapPulse {
  0%, 100% { box-shadow: 0 0 0 4px rgba(13, 148, 136, .15); }
  50% { box-shadow: 0 0 0 8px rgba(13, 148, 136, .08); }
}
.roadmap-item h3 { font-size: 1rem; margin-bottom: .25rem; }
.roadmap-item p { font-size: .875rem; }
.roadmap-item .roadmap-tag {
  display: inline-block; font-size: .7rem; font-weight: 600;
  padding: .15rem .5rem; border-radius: 999px;
  background: rgba(13, 148, 136, .1); color: var(--teal);
  margin-bottom: .4rem;
  opacity: 0; transform: scale(.8);
  transition: opacity .4s ease .2s, transform .4s ease .2s;
}
.roadmap-item.visible .roadmap-tag { opacity: 1; transform: scale(1); }

/* ===== Research Harness Section ===== */
#harness { background: var(--bg); }

.harness-problems {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-bottom: 3rem;
}
.problem-card {
  background: rgba(241, 245, 249, .6);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid rgba(203, 213, 225, .5);
  border-radius: var(--radius);
  padding: 1.75rem;
  transition: transform .25s, border-color .3s, box-shadow .3s;
  position: relative;
}
.problem-card:hover {
  transform: translateY(-4px);
  border-color: rgba(13, 148, 136, .4);
  box-shadow: 0 8px 30px rgba(13, 148, 136, .08);
}
.problem-number {
  font-size: 2rem;
  font-weight: 700;
  color: var(--teal);
  opacity: .25;
  line-height: 1;
  margin-bottom: .75rem;
  font-variant-numeric: tabular-nums;
}
.problem-card h3 { font-size: 1.1rem; margin-bottom: .5rem; }

.steer-mechanisms {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-top: 1.5rem;
}
.steer-card {
  display: flex;
  align-items: flex-start;
  gap: 1.25rem;
  background: rgba(241, 245, 249, .6);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid rgba(203, 213, 225, .5);
  border-left: 3px solid var(--teal);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  transition: box-shadow .25s, border-color .25s;
}
.steer-card:hover {
  box-shadow: 0 4px 20px rgba(13, 148, 136, .1);
  border-left-color: var(--teal-dark);
}
.steer-index {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--teal);
  opacity: .35;
  line-height: 1;
  min-width: 1.5rem;
  padding-top: .1rem;
}
.steer-body h4 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: .3rem;
}
.steer-body p { font-size: .9rem; margin: 0; }

.harness-divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border), transparent);
  margin: 3rem 0;
}

.harness-answer-title {
  font-size: clamp(1.4rem, 2.5vw, 2rem);
  margin-bottom: 1rem;
}

.harness-pillars {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}
.pillar-card {
  background: rgba(241, 245, 249, .6);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid rgba(203, 213, 225, .5);
  border-radius: var(--radius);
  padding: 2rem;
  text-align: center;
  transition: transform .25s, border-color .3s, box-shadow .3s;
  position: relative;
  overflow: hidden;
}
.pillar-card::before {
  content: '';
  position: absolute; inset: 0;
  border-radius: var(--radius);
  padding: 1px;
  background: linear-gradient(135deg, transparent, transparent);
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  transition: background .3s;
  pointer-events: none;
}
.pillar-card:hover {
  transform: translateY(-4px);
  border-color: transparent;
  box-shadow: 0 8px 30px rgba(13, 148, 136, .12);
}
.pillar-card:hover::before {
  background: linear-gradient(135deg, var(--teal), var(--teal-light));
}
.pillar-icon {
  font-size: 2rem;
  display: block;
  margin-bottom: 1rem;
}
.pillar-card h3 { font-size: 1.2rem; margin-bottom: .5rem; }

/* ===== Hero Flow Diagram ===== */
.hero-flow {
  display: flex; align-items: center; justify-content: center;
  flex-wrap: wrap; gap: .45rem;
  opacity: 0; animation: heroFadeUp .8s ease forwards;
  animation-delay: .85s;
}
.flow-step {
  padding: .35rem .9rem;
  background: rgba(255,255,255,.55);
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: .9rem; font-weight: 500; color: var(--text-muted);
  white-space: nowrap;
  backdrop-filter: blur(4px);
}
.flow-arr { color: var(--border); font-size: .9rem; flex-shrink: 0; }
.flow-submit {
  color: var(--teal) !important;
  border-color: rgba(13,148,136,.35) !important;
  background: rgba(13,148,136,.08) !important;
  font-weight: 600 !important;
}
.flow-loop-group {
  display: flex; flex-direction: column; align-items: stretch;
  border: 1px dashed rgba(13,148,136,.35);
  border-radius: 8px; overflow: hidden;
}
.flow-loop-top {
  display: flex; align-items: center; gap: .4rem;
  background: rgba(13,148,136,.06);
  padding: .2rem .6rem;
  border-bottom: 1px dashed rgba(13,148,136,.25);
}
.loop-top-line { flex: 1; height: 1px; background: rgba(13,148,136,.3); }
.loop-top-label {
  font-size: .7rem; color: var(--teal); font-weight: 600;
  white-space: nowrap; opacity: .85;
}
.flow-loop-steps {
  display: flex; align-items: center; gap: .45rem;
  padding: .35rem .6rem;
}
.loop-step {
  background: rgba(13,148,136,.07) !important;
  border-color: rgba(13,148,136,.2) !important;
}

/* ===== What is ARK intro ===== */
/* #intro removed — text moved into hero */
#compare { padding-top: 3.5rem; }
.ark-intro {
  max-width: 700px; margin: 0 auto; text-align: center;
}
.ark-intro-text {
  font-size: 1.15rem; color: var(--text-muted); line-height: 1.75; margin-bottom: 2rem;
}
.intro-stats {
  display: flex; align-items: center; justify-content: center; gap: 1rem; flex-wrap: wrap;
}
.intro-stat {
  padding: .4rem 1.1rem;
  background: rgba(13, 148, 136, .08);
  border: 1px solid rgba(13, 148, 136, .2);
  border-radius: 999px; font-size: .875rem; font-weight: 600; color: var(--teal);
}
.intro-stat-sep { color: var(--border); font-size: 1.2rem; }

/* ===== Comparison split ===== */
.comparison-split {
  display: grid; grid-template-columns: 1fr 1fr; gap: 0;
  border: 1px solid var(--border); border-radius: var(--radius-lg);
  overflow: hidden; margin-bottom: 3rem;
}
.comparison-col { padding: 2rem 2.5rem; }
.comparison-col--other {
  background: rgba(241, 245, 249, .5);
  border-right: 1px solid var(--border);
  opacity: 0; transform: translateX(-40px);
  transition: opacity .6s ease, transform .6s ease;
}
.comparison-col--ark {
  background: rgba(13, 148, 136, .04);
  opacity: 0; transform: translateX(40px);
  transition: opacity .6s ease .15s, transform .6s ease .15s;
}
.comparison-split.visible .comparison-col--other,
.comparison-split.visible .comparison-col--ark {
  opacity: 1; transform: translateX(0);
}
.comparison-col-header {
  font-size: .75rem; font-weight: 700; letter-spacing: 2px;
  text-transform: uppercase; margin-bottom: 1.25rem;
}
.comparison-col--other .comparison-col-header { color: var(--text-muted); }
.comparison-col--ark .comparison-col-header { color: var(--teal); }
.comparison-col ul { display: flex; flex-direction: column; gap: 1.25rem; }
.comparison-col li {
  font-size: .95rem; line-height: 1.55;
  opacity: 0; transform: translateY(12px);
  transition: opacity .4s ease, transform .4s ease;
}
.comparison-split.visible .comparison-col li { opacity: 1; transform: translateY(0); }
.comparison-split.visible .comparison-col li:nth-child(1) { transition-delay: .3s; }
.comparison-split.visible .comparison-col li:nth-child(2) { transition-delay: .4s; }
.comparison-split.visible .comparison-col li:nth-child(3) { transition-delay: .5s; }
.comparison-split.visible .comparison-col li:nth-child(4) { transition-delay: .6s; }
.comparison-split.visible .comparison-col li:nth-child(5) { transition-delay: .7s; }
.comparison-col--other li { color: var(--text-muted); }
.comparison-col--ark li { color: var(--text-primary); }

.contribution-cards {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem;
}

/* ===== Section Wave Dividers ===== */
.wave-divider {
  width: 100%; overflow: hidden; line-height: 0;
  margin-top: -1px;
}
.wave-divider svg {
  display: block; width: 100%; height: 48px;
}
.wave-divider svg path { fill: rgba(203, 213, 225, .06); }
.wave-divider--flip { transform: scaleY(-1); margin-top: 0; margin-bottom: -1px; }

/* ===== Footer ===== */
.footer {
  border-top: none; padding: 2.5rem 0;
  position: relative;
}
.footer::before {
  content: '';
  position: absolute; top: 0; left: 0; right: 0; height: 1px;
  background: linear-gradient(90deg, transparent, var(--teal), var(--teal-light), var(--teal), transparent);
  opacity: .4;
}
.footer .container {
  display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 1rem;
}
.footer-brand { display: flex; align-items: center; gap: .5rem; font-weight: 600; color: var(--text-primary); }
.footer-brand img { height: 24px; width: auto; }
.footer-links { display: flex; align-items: center; gap: 1.5rem; font-size: .85rem; }
.footer-note { font-size: .8rem; color: var(--text-muted); }

/* ===== Scroll Reveal ===== */
.reveal {
  opacity: 0; transform: translateY(30px);
  transition: opacity .6s ease, transform .6s ease;
}
.reveal.visible { opacity: 1; transform: translateY(0); }

/* Stagger utility classes */
.stagger-1 { transition-delay: .1s; }
.stagger-2 { transition-delay: .2s; }
.stagger-3 { transition-delay: .3s; }
.stagger-4 { transition-delay: .4s; }
.stagger-5 { transition-delay: .5s; }
.stagger-6 { transition-delay: .6s; }
.stagger-7 { transition-delay: .7s; }
.stagger-8 { transition-delay: .8s; }

/* ===== prefers-reduced-motion ===== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .hero-bg::before, .hero-bg::after, .hero-bg .hero-bg-layer { animation: none; }
  .hero-particles .particle { display: none; }
  .venues-track, .venues-track-reverse { animation: none; }
  .scroll-progress { transition: none; }
  .hero-logo, .hero h1, .hero-accent, .hero-subtitle, .hero-tagline, .hero-cta, .hero-terminal-wrap, .hero-flow {
    opacity: 1; animation: none;
  }
  .hero-terminal { animation: none; }
  .quickstart-terminal { animation: none; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .phase-card { opacity: 1; transform: none; }
  .roadmap-item { opacity: 1; transform: none; }
  .roadmap-item .roadmap-tag { opacity: 1; transform: none; }
  .comparison-col--other, .comparison-col--ark { opacity: 1; transform: none; }
  .comparison-col li { opacity: 1; transform: none; }
  .agent-icon { animation: none; }
  .btn-primary::after { animation: none; display: none; }
  .hero-cta .btn-primary::after { animation: none; display: none; }
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .agents-grid { grid-template-columns: repeat(2, 1fr); }
  .stat-item { padding: 1.5rem 2rem; }
  .harness-problems { grid-template-columns: repeat(2, 1fr); }
  .harness-pillars { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .comparison-split { grid-template-columns: 1fr; }
  .comparison-col--other { border-right: none; border-bottom: 1px solid var(--border); }
  .contribution-cards { grid-template-columns: 1fr; }
  .hero .container { grid-template-columns: 1fr; text-align: center; }
  .hero-content { align-items: center; }
  .hero-cta { align-items: center; }
  .hero-cta-row { justify-content: center; }
  .hero-terminal-wrap { margin-top: 1rem; }
  .pipeline-phases { grid-template-columns: 1fr; gap: 1rem; }
  .phase-connector { display: none; }
  .papers-grid { grid-template-columns: 1fr; }
  .review-loop { padding: 1.5rem 1rem; }
  .loop-steps { gap: .75rem; }
  .loop-arrow { display: none; }
  .loop-step { padding: .75rem 1rem; width: 100%; }
  .stats-grid { flex-direction: column; gap: 0; }
  .stat-item { padding: 1rem 2rem; }
  .stat-item:not(:last-child)::after {
    width: 60%; height: 1px;
    right: auto; left: 20%; top: auto; bottom: 0;
    background: linear-gradient(90deg, transparent, var(--border), transparent);
  }
  .nav-links {
    display: none; position: fixed; top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(248, 250, 252, .97);
    backdrop-filter: blur(16px);
    flex-direction: column; justify-content: center; align-items: center; gap: 2rem;
    z-index: 999;
  }
  .nav-links.open { display: flex; }
  .hamburger { display: flex; z-index: 1000; }
  .footer .container { flex-direction: column; text-align: center; }
}
@media (max-width: 640px) {
  .features-grid { grid-template-columns: 1fr; }
  .agents-grid { grid-template-columns: 1fr; }
  .harness-problems { grid-template-columns: 1fr; }
  .harness-pillars { grid-template-columns: 1fr; }
  .contribution-cards { grid-template-columns: 1fr; }
  section { padding: 3rem 0; }
  .stat-number { font-size: 2rem; }
}