:root {
  --bg-color: #0f172a;
  --surface-color: #1e293b;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --accent-color: #38bdf8;
  --accent-hover: #0ea5e9;
  --border-color: #334155;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
}

/* Prevent horizontal swaying/wobble on mobile devices */
html,
body {
  overflow-x: hidden;
  width: 100%;
}

body {
  background-color: var(--bg-color);
  color: var(--text-primary);
  line-height: 1.6;
}

.container {
  width: 100%;
  max-width: 1400px;
  margin: 0;
  padding: 0 6vw;
}

header {
  padding: 40px 0;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 60px;
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-links {
  display: flex;
  gap: 25px;
  align-items: center;
}

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

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

.nav-cta {
  background-color: rgba(56, 189, 248, 0.15);
  color: var(--accent-color) !important;
  padding: 8px 18px;
  border-radius: 6px;
}

h1 {
  font-size: 2.2rem;
  display: flex;
  align-items: center;
  gap: 15px;
}

.badge {
  font-size: 0.85rem;
  background-color: rgba(56, 189, 248, 0.15);
  color: var(--accent-color);
  padding: 4px 12px;
  border-radius: 20px;
  font-weight: 600;
  letter-spacing: 1px;
}

header p {
  color: var(--text-secondary);
  font-size: 1.1rem;
  margin-top: 8px;
}

.hero {
  text-align: left;
  margin-bottom: 80px;
}

.hero h2 {
  font-size: 3.5rem;
  margin-bottom: 20px;
  line-height: 1.15;
  letter-spacing: -1px;
}

.hero p {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin-bottom: 35px;
  max-width: 700px;
}

.cta-button {
  display: inline-block;
  background-color: var(--accent-color);
  color: #fff;
  padding: 14px 32px;
  text-decoration: none;
  font-weight: 600;
  border-radius: 6px;
  font-size: 1.1rem;
  transition: background 0.2s ease;
}

.cta-button:hover {
  background-color: var(--accent-hover);
}

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 25px;
  margin-bottom: 80px;
}

.feature {
  background-color: var(--surface-color);
  padding: 35px 25px;
  border-radius: 12px;
  border: 1px solid var(--border-color);
}

.feature h3 {
  margin-bottom: 15px;
  font-size: 1.2rem;
  color: var(--text-primary);
}

.feature p {
  color: var(--text-secondary);
  font-size: 1rem;
}

.roadmap {
  background-color: var(--surface-color);
  padding: 40px;
  border-radius: 12px;
  border-left: 4px solid var(--accent-color);
  margin-bottom: 60px;
}

.roadmap h2 {
  margin-bottom: 15px;
  font-size: 1.8rem;
}

.roadmap p {
  color: var(--text-secondary);
  font-size: 1.15rem;
  max-width: 800px;
}

.video-section {
  background-color: var(--surface-color);
  padding: 50px 40px;
  border-radius: 12px;
  margin-bottom: 60px;
  border: 1px solid var(--border-color);
  text-align: center;
}

.video-section h2 {
  margin-bottom: 10px;
  font-size: 2rem;
}

.video-section>p {
  color: var(--text-secondary);
  font-size: 1.1rem;
  margin-bottom: 35px;
}

.video-container {
  position: relative;
  width: 100%;
  max-width: 800px;
  margin: 0 auto;
  padding-bottom: 56.25%;
  /* 16:9 Aspect Ratio for standard HD video */
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
  border: 1px solid var(--border-color);
}

.video-container iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

.tutorial-content {
  display: flex;
  flex-direction: column;
  gap: 40px;
  margin-top: 40px;
}

@media (min-width: 900px) {
  .tutorial-content {
    flex-direction: row;
    align-items: center;
  }

  .tutorial-content .video-container {
    flex: 1.3;
    margin: 0;
  }

  .tutorial-steps {
    flex: 1;
  }
}

.tutorial-steps {
  display: flex;
  flex-direction: column;
  gap: 25px;
  text-align: left;
}

.step {
  display: flex;
  gap: 15px;
  align-items: flex-start;
  padding: 12px 15px;
  border-radius: 8px;
  text-decoration: none;
  transition: all 0.2s ease;
  border: 1px solid transparent;
  cursor: pointer;
}

.step:hover {
  background-color: rgba(56, 189, 248, 0.05);
  border-color: var(--border-color);
  transform: translateX(4px);
}

.step-num {
  background-color: rgba(56, 189, 248, 0.15);
  color: var(--accent-color);
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  font-weight: 600;
  flex-shrink: 0;
  transition: all 0.2s ease;
}

.step:hover .step-num {
  background-color: var(--accent-color);
  color: #fff;
}

.step-text h4 {
  color: var(--text-primary);
  font-size: 1.1rem;
  margin-bottom: 5px;
}

.step-text p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.5;
}

.outline-btn {
  background-color: transparent;
  border: 1px solid var(--accent-color);
  color: var(--accent-color);
  text-align: center;
  margin-top: 10px;
  align-self: flex-start;
}

.outline-btn:hover {
  background-color: rgba(56, 189, 248, 0.1);
}

footer {
  text-align: left;
  padding: 40px 0;
  color: var(--text-secondary);
  border-top: 1px solid var(--border-color);
  margin-top: 20px;
}

/* Mobile and Tablet Responsiveness */
@media (max-width: 768px) {
  .container {
    padding: 0 15px;
  }

  header {
    padding: 20px 0;
    margin-bottom: 30px;
  }

  .header-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 20px;
  }

  h1 {
    font-size: 1.5rem;
    flex-wrap: wrap;
    gap: 10px;
  }

  .badge {
    font-size: 0.75rem;
    padding: 3px 10px;
  }

  header p {
    font-size: 1rem;
  }

  .hero {
    margin-bottom: 50px;
  }

  .hero h2 {
    font-size: 2rem;
    margin-bottom: 15px;
  }

  .hero p {
    font-size: 1rem;
    margin-bottom: 25px;
  }

  .cta-button {
    display: block;
    text-align: center;
    width: 100%;
  }

  .features {
    grid-template-columns: 1fr;
    gap: 15px;
    margin-bottom: 50px;
  }

  .feature {
    padding: 20px 15px;
  }

  .roadmap {
    padding: 20px 15px;
    margin-bottom: 40px;
  }

  .roadmap h2 {
    font-size: 1.4rem;
  }

  .roadmap p {
    font-size: 1rem;
  }

  .video-section {
    padding: 30px 20px;
  }

  .outline-btn {
    align-self: stretch;
  }

  footer {
    text-align: center;
    padding: 25px 0;
  }
}