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

:root {
  --primary: #2dd4bf;
  --primary-dark: #14b8a6;
  --secondary: #38bdf8;
  --accent: #06b6d4;
  --bg: #0f172a;
  --bg-secondary: #1e293b;
  --text: #f1f5f9;
  --text-secondary: #94a3b8;
  --border: #334155;
  --shadow: rgba(0, 0, 0, 0.3);
  --shadow-lg: rgba(0, 0, 0, 0.4);
}

body {
  font-family: "Inter", system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.header {
  background: rgba(15, 23, 42, 0.8);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-icon {
  color: var(--primary);
}

.logo-text {
  font-size: 20px;
  font-weight: 700;
  color: var(--text);
}

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

.nav a {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  font-size: 15px;
  transition: color 0.2s;
}

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

.github-link {
  display: flex;
  align-items: center;
  color: var(--text);
  transition: color 0.2s;
}

.github-link:hover {
  color: var(--primary);
}

.lang-switch {
  display: flex;
  gap: 0;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 4px;
}

.lang-btn {
  background: transparent;
  color: var(--text-secondary);
  border: none;
  padding: 6px 14px;
  border-radius: 6px;
  font-weight: 600;
  font-size: 14px;
  cursor: pointer;
  transition: all 0.2s;
}

.lang-btn:hover {
  color: var(--text);
}

.lang-btn.active {
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  color: #0f172a;
}

.hero {
  padding: 120px 0 80px;
}

.hero .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.hero-badge {
  display: inline-block;
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  color: white;
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 24px;
}

.hero-title {
  font-size: 56px;
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 24px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 18px;
  font-weight: 400;
  color: var(--text-secondary);
  margin-bottom: 32px;
  line-height: 1.7;
}

.hero-features {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 32px;
}

.hero-feature {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--text);
  font-weight: 500;
}

.hero-feature svg {
  color: var(--primary);
  flex-shrink: 0;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  border-radius: 10px;
  transition: all 0.2s;
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  color: #0f172a;
  font-weight: 700;
  box-shadow: 0 4px 12px rgba(45, 212, 191, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(45, 212, 191, 0.4);
}

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

.btn-secondary:hover {
  background: var(--border);
}

.btn-download {
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  color: #0f172a;
  font-weight: 700;
  box-shadow: 0 4px 12px rgba(45, 212, 191, 0.3);
  padding: 16px 32px;
  font-size: 16px;
}

.btn-download:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(45, 212, 191, 0.4);
}

.hero-image {
  position: relative;
}

.mockup {
  position: relative;
}

.mockup-window {
  background: var(--bg-secondary);
  border-radius: 12px;
  border: 1px solid var(--border);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
  overflow: hidden;
}

.mockup-header {
  background: var(--bg-secondary);
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
}

.mockup-dots {
  display: flex;
  gap: 8px;
}

.mockup-dots span {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--border);
}

.mockup-content {
  position: relative;
  padding: 10px;
  min-height: 400px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.mockup-img {
  width: 100%;
  height: auto;
  border-radius: 8px;
}

.mockup-overlay {
  position: absolute;
  bottom: 24px;
  left: 24px;
  right: 24px;
  background: rgba(30, 41, 59, 0.9);
  backdrop-filter: blur(8px);
  padding: 12px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  text-align: center;
  border: 1px solid var(--border);
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 64px;
}

.section-title {
  font-size: 42px;
  font-weight: 800;
  margin-bottom: 16px;
  color: var(--text);
}

.section-subtitle {
  font-size: 18px;
  color: var(--text-secondary);
  font-weight: 400;
}

.features {
  padding: 100px 0;
  background: linear-gradient(180deg, var(--bg) 0%, var(--bg-secondary) 100%);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 32px;
}

.feature-card {
  background: var(--bg);
  padding: 32px;
  border-radius: 16px;
  border: 1px solid var(--border);
  transition: all 0.3s;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px var(--shadow);
}

.feature-icon {
  width: 56px;
  height: 56px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  color: white;
}

.feature-title {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text);
}

.feature-text {
  font-size: 15px;
  color: var(--text-secondary);
  margin-bottom: 20px;
  line-height: 1.6;
}

.feature-preview {
  background: var(--bg-secondary);
  border: 1px dashed var(--border);
  padding: 16px;
  border-radius: 8px;
  text-align: center;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  min-height: 120px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.how-it-works {
  padding: 100px 0;
}

.steps {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr;
  gap: 32px;
  align-items: center;
  max-width: 1000px;
  margin: 0 auto;
}

.step {
  text-align: center;
}

.step-number {
  width: 64px;
  height: 64px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  color: white;
  font-size: 32px;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  margin: 0 auto 20px;
}

.step-title {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text);
}

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

.step-arrow {
  font-size: 32px;
  color: var(--primary);
  font-weight: 300;
}

.download {
  padding: 100px 0;
  background: linear-gradient(135deg, #1e293b 0%, #0f172a 50%, #1e293b 100%);
  position: relative;
}

.download::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  opacity: 0.1;
}

.download-card {
  text-align: center;
  max-width: 600px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.download-title {
  font-size: 42px;
  font-weight: 800;
  color: white;
  margin-bottom: 16px;
}

.download-subtitle {
  font-size: 18px;
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: 32px;
  line-height: 1.6;
}

.download-info {
  display: flex;
  justify-content: center;
  gap: 32px;
  margin-top: 24px;
  flex-wrap: wrap;
}

.download-item {
  display: flex;
  align-items: center;
  gap: 8px;
  color: white;
  font-weight: 500;
}

.download-item svg {
  color: rgba(255, 255, 255, 0.9);
}

.footer {
  background: #020617;
  color: white;
  padding: 48px 0 24px;
  border-top: 1px solid var(--border);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 32px;
}

.footer-logo {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 8px;
}

.footer-text {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.7);
}

.footer-links a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: white;
  text-decoration: none;
  font-weight: 600;
  padding: 10px 20px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 8px;
  transition: all 0.2s;
}

.footer-links a:hover {
  background: rgba(255, 255, 255, 0.1);
}

.footer-bottom {
  text-align: center;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.6);
}

@media (max-width: 968px) {
  .hero .container {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .hero-title {
    font-size: 42px;
  }

  .section-title {
    font-size: 32px;
  }

  .steps {
    grid-template-columns: 1fr;
  }

  .step-arrow {
    display: none;
  }

  .nav {
    display: none;
  }

  .footer-content {
    flex-direction: column;
    gap: 24px;
    text-align: center;
  }
}

@media (max-width: 640px) {
  .hero-title {
    font-size: 32px;
  }

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