/* CoSwarm.ai — Distinctive AI-themed landing page */
/* Design: Dark, collaborative, swarm-inspired */

:root {
  /* Avoid AI slop purple — use emerald/teal + warm accent */
  --bg-deep: #08090d;
  --bg-card: #0f1117;
  --bg-elevated: #161a22;
  --border: rgba(16, 185, 129, 0.15);
  --text: #e8eaed;
  --text-muted: #b0b8c4;  /* Improved contrast for WCAG AA (4.5:1 on dark) */
  --accent: #10b981;        /* Emerald — collaboration, growth */
  --accent-dim: #059669;
  --accent-glow: rgba(16, 185, 129, 0.4);
  --warm: #f59e0b;         /* Amber — human warmth, CTAs */
  --warm-dim: #d97706;
  --gradient-start: #10b981;
  --gradient-end: #06b6d4;  /* Cyan blend */
  --human-color: #3b82f6;
  --agent-color: #10b981;
  --radius: 12px;
  --radius-lg: 20px;
  --font-display: 'Syne', sans-serif;
  --font-body: 'DM Sans', sans-serif;
}

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

/* Skip link — visible on focus for keyboard users */
.skip-link {
  position: absolute;
  top: -100px;
  left: 1rem;
  z-index: 200;
  padding: 0.75rem 1.25rem;
  background: var(--accent);
  color: #08090d;
  font-weight: 600;
  text-decoration: none;
  border-radius: var(--radius);
  transition: top 0.2s;
}
.skip-link:focus {
  top: 1rem;
  outline: 3px solid #fff;
  outline-offset: 2px;
}

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg-deep);
  min-height: 100vh;
  overflow-x: hidden;
}

/* Swarm background */
.swarm-bg {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
}

#swarm-canvas {
  width: 100%;
  height: 100%;
  opacity: 0.6;
}

@media (prefers-reduced-motion: reduce) {
  #swarm-canvas {
    display: none;
  }
}

.grid-overlay {
  position: absolute;
  inset: 0;
  background-image: 
    linear-gradient(rgba(16, 185, 129, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(16, 185, 129, 0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, black, transparent 70%);
}

/* Header */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 2rem;
  background: rgba(8, 9, 13, 0.8);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.logo {
  display: flex;
  align-items: center;
  text-decoration: none;
  line-height: 0;
}

.logo-img {
  height: 44px;
  width: auto;
  display: block;
  object-fit: contain;
}

@media (max-width: 768px) {
  .logo-img {
    height: 38px;
  }
}

.nav {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav a {
  color: var(--text-muted);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s;
}

.nav a:hover {
  color: var(--text);
}

.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.menu-toggle span {
  width: 24px;
  height: 2px;
  background: var(--text);
}

.menu-toggle:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.625rem 1.25rem;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.9375rem;
  text-decoration: none;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all 0.2s;
  border: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-dim));
  color: #fff;
  box-shadow: 0 4px 20px var(--accent-glow);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 28px var(--accent-glow);
}

.btn:focus-visible,
a.btn:focus-visible {
  outline: 2px solid #fff;
  outline-offset: 2px;
}

.logo:focus-visible,
.nav a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

.btn-ghost {
  background: transparent;
  color: var(--text-muted);
  border: 1px solid var(--border);
}

.btn-ghost:hover {
  color: var(--text);
  border-color: var(--accent);
}

.btn-lg {
  padding: 0.875rem 1.75rem;
  font-size: 1rem;
}

/* Hero */
.hero {
  padding: 8rem 2rem 6rem;
  text-align: center;
  max-width: 720px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.375rem 1rem;
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid var(--border);
  border-radius: 100px;
  font-size: 0.875rem;
  color: var(--accent);
  margin-bottom: 2rem;
}

.badge-dot {
  width: 6px;
  height: 6px;
  background: var(--accent);
  border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
}

@media (prefers-reduced-motion: reduce) {
  .badge-dot {
    animation: none;
  }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.hero-title {
  font-family: 'Outfit', sans-serif;
  font-weight: 700;
  font-size: clamp(2.5rem, 6vw, 4rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin: 0 0 1.5rem;
}

.hero-title .line {
  display: block;
}

.gradient-text {
  background: linear-gradient(135deg, #34d399, #22d3ee);  /* Brighter for WCAG AA contrast */
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.1875rem;
  color: var(--text-muted);
  margin: 0 0 2.5rem;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
}

/* Product preview */
.product-preview {
  padding: 4rem 2rem 8rem;
}

.browser-mockup {
  max-width: 800px;
  margin: 0 auto;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.5);
}

.browser-chrome {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.25rem;
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border);
}

.browser-dots {
  display: flex;
  gap: 6px;
}

.browser-dots span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--text-muted);
  opacity: 0.5;
}

.browser-url {
  flex: 1;
  text-align: center;
  font-size: 0.8125rem;
  color: var(--text-muted);
  font-family: monospace;
}

.browser-content {
  background: var(--bg-card);
  padding: 2rem;
}

.doc-preview {
  background: var(--bg-elevated);
  border-radius: var(--radius);
  padding: 1.5rem 2rem;
  border: 1px solid var(--border);
}

.doc-header {
  margin-bottom: 1.5rem;
}

.doc-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.125rem;
  display: block;
  margin-bottom: 0.75rem;
}

.doc-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.meta-item {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.avatar {
  width: 20px;
  height: 20px;
  border-radius: 4px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  font-weight: 600;
}

.avatar.human {
  background: rgba(59, 130, 246, 0.2);
  color: var(--human-color);
}

.avatar.agent {
  background: rgba(16, 185, 129, 0.2);
  color: var(--agent-color);
}

.doc-layout {
  display: flex;
  gap: 1.5rem;
  align-items: flex-start;
}

.doc-body {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.doc-side-panel {
  flex-shrink: 0;
  width: 240px;
  padding: 1rem 1.25rem;
  background: rgba(16, 185, 129, 0.08);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.doc-side-panel .side-panel-message {
  margin: 0;
  font-size: 0.9rem;
  color: var(--accent);
  line-height: 1.5;
}

.doc-body.diff-body .doc-line {
  line-height: 1.8;
}

.doc-line {
  margin: 0;
  font-size: 0.9375rem;
}

/* Tiptap Snapshot Compare–inspired diff styling */
.doc-diff-view [data-diff-type="inline-delete"],
.doc-diff-view [data-diff-type="block-delete"] {
  background: rgba(248, 113, 113, 0.25);
  border-radius: 3px;
  padding: 0.1em 0.2em;
  text-decoration: line-through;
  color: #fca5a5;
}

.doc-diff-view [data-diff-type="inline-insert"],
.doc-diff-view [data-diff-type="block-insert"],
.doc-diff-view [data-diff-type="inline-update"] {
  background: rgba(34, 197, 94, 0.25);
  border-radius: 3px;
  padding: 0.1em 0.2em;
  color: #86efac;
}

.doc-diff-view .doc-diff-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-top: 0.5rem;
}

.doc-diff-view .diff-compare {
  font-size: 0.8125rem;
  color: var(--accent);
  font-weight: 500;
}

.doc-diff-view .diff-contributors {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.doc-diff-view .diff-contributors .avatar {
  width: 18px;
  height: 18px;
  font-size: 0.65rem;
}

/* User attribution tooltip on diff spans (Tiptap-style) */
.doc-diff-view [data-diff-user-id] {
  position: relative;
  cursor: default;
}

.doc-diff-view [data-diff-user-id]::after {
  content: attr(data-diff-user-id);
  position: absolute;
  bottom: 100%;
  left: 0;
  margin-bottom: 4px;
  padding: 0.25rem 0.5rem;
  font-size: 0.7rem;
  color: var(--text);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 4px;
  white-space: nowrap;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.15s, visibility 0.15s;
}

.doc-diff-view [data-diff-user-id]:hover::after {
  opacity: 1;
  visibility: visible;
}

.doc-footer {
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 1rem;
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.version-tag {
  background: rgba(16, 185, 129, 0.15);
  color: var(--accent);
  padding: 0.25rem 0.5rem;
  border-radius: 6px;
  font-weight: 600;
}

/* Features */
.features {
  padding: 6rem 2rem;
  max-width: 1000px;
  margin: 0 auto;
}

.section-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  text-align: center;
  margin: 0 0 3rem;
  letter-spacing: -0.02em;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: all 0.25s;
}

.feature-card:hover {
  border-color: rgba(16, 185, 129, 0.3);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}

@media (prefers-reduced-motion: reduce) {
  .feature-card:hover {
    transform: none;
  }
  .btn-primary:hover,
  .btn-ghost:hover {
    transform: none;
  }
}

.feature-icon {
  font-size: 2rem;
  margin-bottom: 1rem;
  color: var(--accent);
}

.feature-card h3 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.25rem;
  margin: 0 0 0.5rem;
}

.feature-card p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.9375rem;
}

/* Waitlist */
.waitlist {
  padding: 6rem 2rem;
}

.waitlist-card {
  max-width: 480px;
  margin: 0 auto;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 3rem;
  text-align: center;
}

.waitlist-card h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.75rem;
  margin: 0 0 0.75rem;
}

.waitlist-card > p {
  color: var(--text-muted);
  margin: 0 0 2rem;
  font-size: 0.9375rem;
}

.waitlist-form {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.waitlist-form input {
  padding: 1rem 1.25rem;
  font-family: var(--font-body);
  font-size: 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-elevated);
  color: var(--text);
  transition: border-color 0.2s;
}

.waitlist-form input::placeholder {
  color: var(--text-muted);
}

.waitlist-form input:focus {
  border-color: var(--accent);
}

.waitlist-form input:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.form-row {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.form-status {
  min-height: 1.5em;
  font-size: 0.9rem;
}

.form-status:not(:empty) {
  color: var(--accent);
}

.form-status.error {
  color: #f87171;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.waitlist-note {
  margin-top: 1rem;
  font-size: 0.8125rem;
  color: var(--text-muted);
}

/* Cookie / privacy banner */
.cookie-banner {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  left: auto;
  max-width: 400px;
  z-index: 150;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
  padding: 1.25rem 1.5rem;
  animation: cookie-slide-up 0.3s ease-out;
}

.cookie-banner.cookie-banner-dismissed {
  display: none;
}

@keyframes cookie-slide-up {
  from {
    opacity: 0;
    transform: translateY(1rem);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.cookie-banner-inner {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

.cookie-banner-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.5rem;
  line-height: 1;
  cursor: pointer;
  padding: 0.25rem;
  border-radius: 4px;
  transition: color 0.2s;
}

.cookie-banner-close:hover {
  color: var(--text);
}

.cookie-banner-close:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.cookie-banner-content {
  flex: 1;
  padding-right: 2rem;
}

.cookie-banner-title {
  margin: 0 0 0.5rem;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
}

.cookie-banner-desc {
  margin: 0;
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.cookie-banner-quip {
  display: block;
  margin-top: 0.5rem;
  color: var(--accent);
  font-weight: 500;
}

.cookie-banner-dismiss-btn {
  margin-top: 1rem;
  padding: 0.5rem 1rem;
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--accent);
  background: rgba(16, 185, 129, 0.15);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s;
}

.cookie-banner-dismiss-btn:hover {
  background: rgba(16, 185, 129, 0.25);
  border-color: var(--accent);
}

.cookie-banner-dismiss-btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.cookie-banner-art {
  flex-shrink: 0;
  width: 56px;
  height: 56px;
}

.cookie-banner-art svg {
  width: 100%;
  height: 100%;
}

.cookie-banner-art .cookie-agent {
  --accent: #10b981;
  --bg-deep: #08090d;
}

@media (max-width: 768px) {
  .cookie-banner {
    left: 1rem;
    right: 1rem;
    bottom: 1rem;
    max-width: none;
  }
  .cookie-banner-art {
    display: none;
  }
}

/* Footer */
.footer {
  padding: 2rem;
  text-align: center;
  border-top: 1px solid var(--border);
}

.footer p {
  margin: 0;
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* Mobile */
@media (max-width: 768px) {
  .header {
    padding: 1rem 1.5rem;
  }

  .nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 1.5rem;
    right: 1.5rem;
    flex-direction: column;
    gap: 0;
    padding: 1rem;
    margin-top: 0.5rem;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
  }

  .nav.nav-open {
    display: flex;
  }

  .nav a {
    padding: 0.75rem 1rem;
    border-radius: 6px;
  }

  .nav a:hover {
    background: rgba(16, 185, 129, 0.1);
  }

  .menu-toggle {
    display: flex;
  }

  .hero {
    padding: 6rem 1.5rem 4rem;
  }

  .hero-actions {
    flex-direction: column;
  }

  .hero-actions .btn {
    width: 100%;
  }

  .browser-content {
    padding: 1rem;
  }

  .doc-preview {
    padding: 1rem 1.25rem;
  }

  .doc-layout {
    flex-direction: column;
  }

  .doc-side-panel {
    width: 100%;
  }

  .doc-meta {
    flex-direction: column;
  }
}