* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --bg-dark: #080a12;
  --bg-darker: #0a0d17;
  --bg-panel: #111827;
  --bg-panel-light: #1a202c;
  --text-primary: #eef3ff;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --border-color: rgba(255, 255, 255, 0.1);
  --cyan: #22d3ee;
  --cyan-dark: #06b6d4;
  --violet: #5865f2;
  --violet-dark: #4752c4;
  --accent: linear-gradient(135deg, #5865f2, #22d3ee);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Inter', 'Roboto', sans-serif;
  background: linear-gradient(135deg, #080a12, #0f1420 50%, #0a0d17);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition);
}

.shell {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Navigation */
.nav {
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1400px;
  margin: 0 auto;
  width: 100%;
  padding: 0 32px;
  border-bottom: 1px solid var(--border-color);
  backdrop-filter: blur(10px);
  background: rgba(8, 10, 18, 0.8);
  position: sticky;
  top: 0;
  z-index: 100;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
  transition: var(--transition);
}

.logo {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  box-shadow: 0 0 24px rgba(34, 211, 238, 0.3);
  object-fit: cover;
}

.brand-text {
  font-size: 24px;
  font-weight: 900;
  background: var(--accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.5px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-secondary);
  position: relative;
  transition: color 0.3s ease;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width 0.3s ease;
  border-radius: 1px;
}

.nav-link:hover {
  color: var(--cyan);
}

.nav-link:hover::after {
  width: 100%;
}

@media (max-width: 768px) {
  .nav {
    padding: 0 16px;
  }

  .nav-links {
    gap: 16px;
    font-size: 12px;
  }
}

/* Hero Section */
.hero {
  max-width: 1400px;
  margin: 0 auto;
  width: 100%;
  padding: 80px 32px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
  min-height: calc(100vh - 72px);
}

.hero-content {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  width: fit-content;
  padding: 8px 16px;
  background: rgba(34, 211, 238, 0.1);
  border: 1px solid var(--cyan);
  border-radius: 99px;
  color: var(--cyan);
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.hero-title {
  font-size: clamp(48px, 8vw, 72px);
  line-height: 1.1;
  font-weight: 900;
  letter-spacing: -1px;
}

.hero-description {
  font-size: 18px;
  color: var(--text-secondary);
  max-width: 500px;
  line-height: 1.8;
}

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

.download-status {
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 8px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: 10px;
  font-weight: 700;
  font-size: 14px;
  border: none;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  white-space: nowrap;
}

.btn-primary {
  background: var(--accent);
  color: white;
  box-shadow: 0 8px 24px rgba(88, 101, 242, 0.3);
}

.btn-primary:hover:not([aria-disabled="true"]) {
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(88, 101, 242, 0.4);
}

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

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: var(--cyan);
  color: var(--cyan);
}

.btn[aria-disabled="true"] {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn.large {
  padding: 18px 36px;
  font-size: 16px;
}

.btn-icon {
  font-size: 16px;
}

/* Hero Visual */
.hero-visual {
  position: relative;
}

.window-card {
  border: 1px solid var(--border-color);
  border-radius: 16px;
  background: linear-gradient(135deg, rgba(17, 24, 39, 0.6), rgba(10, 13, 23, 0.6));
  backdrop-filter: blur(10px);
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
  animation: float 6s ease-in-out infinite;
}

@keyframes float {
  0%, 100% {
    transform: translateY(0px);
  }
  50% {
    transform: translateY(-20px);
  }
}

.window-header {
  height: 48px;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 16px;
  border-bottom: 1px solid var(--border-color);
  background: rgba(0, 0, 0, 0.3);
}

.window-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: #404854;
  transition: var(--transition);
}

.window-card:hover .window-dot {
  background: #5a6370;
}

.window-content {
  display: grid;
  grid-template-columns: 100px 1fr;
  height: 380px;
  overflow: hidden;
}

.sidebar {
  background: rgba(0, 0, 0, 0.2);
  border-right: 1px solid var(--border-color);
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.sidebar-item {
  height: 40px;
  background: rgba(255, 255, 255, 0.06);
  border-radius: 8px;
  cursor: pointer;
  transition: var(--transition);
}

.sidebar-item.active {
  background: rgba(34, 211, 238, 0.2);
  border-left: 3px solid var(--cyan);
}

.sidebar-item:hover {
  background: rgba(255, 255, 255, 0.1);
}

.chat-area {
  padding: 32px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  justify-content: flex-start;
}

.chat-logo {
  width: 80px;
  height: 80px;
  border-radius: 16px;
  box-shadow: 0 12px 40px rgba(88, 101, 242, 0.3);
  object-fit: cover;
}

.message-mock {
  height: 16px;
  background: linear-gradient(90deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.04));
  border-radius: 4px;
  width: 100%;
}

.message-mock.short {
  width: 70%;
}

@media (max-width: 1024px) {
  .hero {
    grid-template-columns: 1fr;
    gap: 40px;
    padding: 60px 32px;
    min-height: auto;
  }

  .hero-title {
    font-size: clamp(36px, 6vw, 56px);
  }

  .window-content {
    height: 300px;
  }
}

/* Features Section */
.features {
  max-width: 1400px;
  margin: 0 auto;
  width: 100%;
  padding: 120px 32px;
  border-top: 1px solid var(--border-color);
}

.section-header {
  text-align: center;
  margin-bottom: 80px;
}

.section-header h2 {
  font-size: clamp(40px, 6vw, 56px);
  line-height: 1.2;
  margin-bottom: 16px;
  font-weight: 900;
}

.section-header p {
  font-size: 18px;
  color: var(--text-secondary);
  max-width: 500px;
  margin: 0 auto;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 32px;
}

.feature-card {
  padding: 32px;
  border: 1px solid var(--border-color);
  border-radius: 16px;
  background: linear-gradient(135deg, rgba(17, 24, 39, 0.4), rgba(10, 13, 23, 0.4));
  backdrop-filter: blur(10px);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  gap: 16px;
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(34, 211, 238, 0.1), transparent);
  opacity: 0;
  transition: opacity 0.3s ease;
  pointer-events: none;
}

.feature-card:hover {
  border-color: var(--cyan);
  background: linear-gradient(135deg, rgba(17, 24, 39, 0.6), rgba(10, 13, 23, 0.6));
  transform: translateY(-8px);
}

.feature-card:hover::before {
  opacity: 1;
}

.feature-icon {
  font-size: 40px;
  width: 64px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  background: rgba(34, 211, 238, 0.1);
  border: 1px solid rgba(34, 211, 238, 0.2);
}

.feature-card h3 {
  font-size: 20px;
  font-weight: 800;
}

.feature-card p {
  color: var(--text-secondary);
  font-size: 15px;
  line-height: 1.6;
}

/* Communities Section */
.communities {
  max-width: 1400px;
  margin: 0 auto;
  width: 100%;
  padding: 120px 32px;
  border-top: 1px solid var(--border-color);
}

.communities-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.community-item {
  padding: 32px;
  border: 1px solid var(--border-color);
  border-radius: 16px;
  background: linear-gradient(135deg, rgba(34, 211, 238, 0.05), rgba(88, 101, 242, 0.05));
  backdrop-filter: blur(10px);
  text-align: center;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.community-item:hover {
  border-color: var(--violet);
  background: linear-gradient(135deg, rgba(34, 211, 238, 0.1), rgba(88, 101, 242, 0.1));
  transform: translateY(-8px);
}

.community-icon {
  font-size: 48px;
  display: block;
  margin-bottom: 8px;
}

.community-item h3 {
  font-size: 18px;
  font-weight: 800;
}

.community-item p {
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.6;
}

/* Download Section */
.download {
  max-width: 1400px;
  margin: 0 auto;
  width: 100%;
  padding: 120px 32px;
  border-top: 1px solid var(--border-color);
}

.download-content {
  text-align: center;
}

.download-content h2 {
  font-size: clamp(40px, 6vw, 56px);
  margin-bottom: 12px;
}

.download-content > p {
  font-size: 18px;
  color: var(--text-secondary);
  margin-bottom: 64px;
}

.download-info {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
  margin-bottom: 48px;
}

.info-card {
  padding: 24px;
  border: 1px solid var(--border-color);
  border-radius: 12px;
  background: rgba(17, 24, 39, 0.4);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.info-icon {
  font-size: 32px;
  display: block;
}

.info-card p {
  color: var(--text-secondary);
  font-size: 15px;
}

.info-card strong {
  color: var(--text-primary);
  font-weight: 700;
}

/* Footer */
.footer {
  border-top: 1px solid var(--border-color);
  background: rgba(8, 10, 18, 0.8);
  backdrop-filter: blur(10px);
  padding: 80px 32px 32px;
  margin-top: 80px;
}

.footer-content {
  max-width: 1400px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 48px;
  margin-bottom: 48px;
}

.footer-section h4 {
  font-size: 16px;
  font-weight: 800;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.footer-section p {
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1.6;
  margin-bottom: 16px;
}

.footer-section ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-section a {
  color: var(--text-muted);
  font-size: 14px;
  transition: var(--transition);
}

.footer-section a:hover {
  color: var(--cyan);
}

.social-links {
  display: flex;
  gap: 12px;
  margin-top: 16px;
}

.social-link {
  width: 40px;
  height: 40px;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  transition: var(--transition);
}

.social-link:hover {
  border-color: var(--cyan);
  background: rgba(34, 211, 238, 0.1);
}

.footer-bottom {
  text-align: center;
  border-top: 1px solid var(--border-color);
  padding-top: 32px;
}

.footer-bottom p {
  color: var(--text-muted);
  font-size: 13px;
  margin-bottom: 8px;
}

.heart {
  display: inline-block;
  animation: heartbeat 1.5s ease-in-out infinite;
}

@keyframes heartbeat {
  0%, 100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.2);
  }
}

/* Responsive */
@media (max-width: 768px) {
  .hero {
    padding: 40px 16px;
  }

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

  .btn {
    width: 100%;
    justify-content: center;
  }

  .nav {
    flex-direction: column;
    height: auto;
    padding: 12px 16px;
    gap: 12px;
  }

  .nav-links {
    width: 100%;
    gap: 16px;
    font-size: 12px;
    flex-wrap: wrap;
    justify-content: center;
  }

  .features,
  .communities,
  .download {
    padding: 80px 16px;
  }

  .section-header h2 {
    font-size: clamp(32px, 5vw, 40px);
  }

  .features-grid,
  .communities-grid {
    grid-template-columns: 1fr;
  }

  .footer-content {
    grid-template-columns: 1fr;
    gap: 32px;
  }
}