:root {
  --primary: #ff3b6a;
  --secondary: #1e1e2f;
  --accent: #ffe156;
  --bg: #181825;
  --text: #fff;
  --card: #23233a;
  --card-hover: #2d2d4d;
  --success: #4caf50;
  --danger: #e74c3c;
  --shadow: 0 4px 24px rgba(0,0,0,0.2);
  --radius: 16px;
  --transition: 0.2s;
}

body {
  margin: 0;
  font-family: 'Montserrat', Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

header.hero {
  background: linear-gradient(120deg, var(--primary) 0%, var(--secondary) 100%);
  color: var(--text);
  padding: 60px 0 40px 0;
  position: relative;
  overflow: hidden;
}

.hero-content {
  max-width: 700px;
  margin: 0 auto;
  text-align: center;
  z-index: 2;
  position: relative;
}

.hero-content h1 {
  font-size: 2.8rem;
  margin-bottom: 0.5em;
  letter-spacing: 1px;
}

.hero-content p {
  font-size: 1.2rem;
  margin-bottom: 1.5em;
}

.hero-content button {
  background: var(--accent);
  color: var(--secondary);
  border: none;
  padding: 0.9em 2em;
  font-size: 1.1rem;
  border-radius: var(--radius);
  cursor: pointer;
  font-weight: bold;
  box-shadow: var(--shadow);
  transition: background var(--transition), color var(--transition);
}

.hero-content button:hover {
  background: var(--primary);
  color: var(--text);
}

.hero-bg {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: url('https://images.unsplash.com/photo-1506744038136-46273834b3fb?auto=format&fit=crop&w=1200&q=80') center/cover no-repeat;
  opacity: 0.18;
  z-index: 1;
}

main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 30px 16px 60px 16px;
}

.section {
  margin-bottom: 48px;
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 32px 24px;
  transition: background var(--transition);
}

.section h2 {
  color: var(--accent);
  margin-top: 0;
  font-size: 2rem;
  margin-bottom: 18px;
}

.competitor-cards {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  justify-content: flex-start;
}

.competitor-card {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px 18px;
  min-width: 220px;
  max-width: 260px;
  flex: 1 1 220px;
  transition: background var(--transition), transform var(--transition);
  cursor: pointer;
  position: relative;
}

.competitor-card:hover {
  background: var(--card-hover);
  transform: translateY(-6px) scale(1.03);
}

.competitor-card .name {
  font-size: 1.2rem;
  font-weight: bold;
  color: var(--accent);
  margin-bottom: 0.5em;
}

.competitor-card .desc {
  font-size: 1rem;
  color: #e0e0e0;
}

#strategy-list {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  justify-content: flex-start;
}

.strategy-card {
  background: var(--secondary);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 22px 18px;
  min-width: 260px;
  max-width: 340px;
  flex: 1 1 260px;
  transition: background var(--transition), transform var(--transition);
  cursor: pointer;
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.strategy-card.active {
  border: 2px solid var(--accent);
  background: #2d2d4d;
}

.strategy-card .title {
  font-size: 1.1rem;
  font-weight: bold;
  color: var(--accent);
}

.strategy-card .desc {
  font-size: 0.98rem;
  color: #f3f3f3;
}

.strategy-toggle {
  margin-top: 10px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.strategy-toggle input[type="checkbox"] {
  accent-color: var(--primary);
  width: 22px;
  height: 22px;
}

.impact-controls {
  margin-bottom: 18px;
}

#impactChart {
  width: 100%;
  max-width: 700px;
  height: 320px;
  background: #fff;
  border-radius: var(--radius);
  margin: 0 auto;
  display: block;
  box-shadow: var(--shadow);
}

#action-steps {
  margin-bottom: 18px;
}

.action-step {
  background: var(--secondary);
  border-radius: 8px;
  padding: 12px 16px;
  margin-bottom: 10px;
  color: #f3f3f3;
  font-size: 1.05rem;
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}

#download-btn, #share-btn {
  background: var(--primary);
  color: var(--text);
  border: none;
  padding: 0.7em 1.5em;
  font-size: 1rem;
  border-radius: 8px;
  cursor: pointer;
  font-weight: bold;
  margin-top: 10px;
  transition: background var(--transition), color var(--transition);
}

#download-btn:hover, #share-btn:hover {
  background: var(--accent);
  color: var(--secondary);
}

footer {
  text-align: center;
  padding: 18px 0;
  background: var(--secondary);
  color: #bdbdbd;
  font-size: 1rem;
  border-top: 2px solid var(--primary);
}

@media (max-width: 900px) {
  .competitor-cards, #strategy-list {
    flex-direction: column;
    gap: 18px;
  }
  main {
    padding: 18px 4px 40px 4px;
  }
  .section {
    padding: 18px 8px;
  }
}