:root {
  --bg: #f4f4f4;
  --text: #222;
  --accent: #4caf50;
  --accent-hover: #388e3c;
  --card-bg: #ffffff;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121212;
    --text: #eee;
    --accent: #2196f3;
    --accent-hover: #1769aa;
    --card-bg: #1f1f1f;
  }
}

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

body {
  font-family: 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--text);
  transition: background 0.3s, color 0.3s;
}

/* Hero */
.hero {
  padding: 5rem 2rem;
  text-align: center;
  background: var(--bg);
}

.content h1 {
  font-size: 2.6rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--accent);
}

.content p {
  font-size: 1.2rem;
  margin-bottom: 2rem;
  max-width: 600px;
  margin-inline: auto;
  opacity: 0.9;
}

.main-btn {
  background: var(--accent);
  color: white;
  padding: 1rem 2rem;
  font-size: 1.1rem;
  font-weight: 600;
  text-decoration: none;
  border-radius: 10px;
  transition: background 0.3s, transform 0.2s;
  box-shadow: 0 5px 12px rgba(0,0,0,0.15);
}

.main-btn:hover {
  background: var(--accent-hover);
  transform: translateY(-2px);
}

/* Features */
.features {
  padding: 4rem 2rem;
  background: var(--card-bg);
  text-align: center;
  margin-bottom: 3rem;
}

.features h2 {
  font-size: 2rem;
  color: var(--accent);
  margin-bottom: 2rem;
}

.grid {
  display: flex;
  flex-wrap: wrap;
  gap: 2rem;
  justify-content: center;
}

.feature {
  background: var(--bg);
  padding: 1.5rem;
  border-radius: 12px;
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.08);
  transition: transform 0.3s, box-shadow 0.3s;
  width: 100%;
  max-width: 300px;
}

.feature:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.12);
}

.feature h3 {
  margin-bottom: 0.8rem;
  font-size: 1.25rem;
  color: var(--accent);
}

.feature p {
  font-size: 0.95rem;
  color: var(--text);
  line-height: 1.6;
}

/* How It Works Section */
.how-it-works {
  padding: 4rem 2rem 2rem;
  background: var(--card-bg);
  text-align: center;
  padding-top: 1rem;
}

.how-it-works h2 {
  font-size: 2rem;
  color: var(--accent);
  margin-bottom: 2rem;
}

.how-it-works .grid {
  display: flex;
  flex-wrap: wrap;
  gap: 2rem;
  justify-content: center;
}

.how-it-works .feature {
  background: var(--bg);
  padding: 1.5rem;
  border-radius: 12px;
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.08);
  transition: transform 0.3s, box-shadow 0.3s;
  width: 100%;
  max-width: 300px;
}

.how-it-works .feature:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.12);
}

.how-it-works .feature h3 {
  margin-bottom: 0.8rem;
  font-size: 1.25rem;
  color: var(--accent);
}

.how-it-works .feature p {
  font-size: 0.95rem;
  color: var(--text);
  line-height: 1.6;
}

/* Footer */
footer {
  text-align: center;
  padding: 2rem;
  background: var(--bg);
  font-size: 0.9rem;
  color: #777;
}

/* ✅ Responsive */
@media (max-width: 600px) {
  .content h1 {
    font-size: 1.8rem;
    line-height: 1.3;
  }

  .content p {
    font-size: 1rem;
    line-height: 1.5;
    padding: 0 0.5rem;
  }

  .main-btn {
    width: 100%;
    display: block;
    font-size: 1rem;
  }

  .grid,
  .how-it-works .grid {
    flex-direction: column;
    align-items: stretch;
    gap: 1.2rem;
  }

  .feature,
  .how-it-works .feature {
    max-width: 100%;
    padding: 1.2rem 1rem;
    width: 100%;
  }

  .feature h3,
  .how-it-works .feature h3 {
    font-size: 1.1rem;
  }

  .feature p,
  .how-it-works .feature p {
    font-size: 0.9rem;
    line-height: 1.5;
  }

  .how-it-works h2,
  .features h2 {
    font-size: 1.6rem;
  }

  footer {
    font-size: 0.8rem;
    padding: 1.5rem 1rem;
  }
}

@media (max-width: 400px) {
  .feature,
  .how-it-works .feature {
    padding: 1rem 0.8rem;
  }
}

/* Header Styles */
.site-header {
  background-color: #797979a1; /* translucent gray */
  padding: 1rem 2rem;
  position: sticky;
  top: 0;
  width: 100%;
  z-index: 9999;
  box-shadow: none;
  transition: box-shadow 0.3s ease;
  display: flex;
  justify-content: space-between; /* name left, logo right */
  align-items: center;
}

.site-name {
  font-size: 2rem;
  font-weight: 700;
  user-select: none;
  margin-left: 0;
  color: var(--accent); /* green in light, blue in dark */
  transition: color 0.3s;
}

.site-logo {
  height: 40px;
  width: auto;
  object-fit: contain;
  user-select: none;
  margin-right: 0;
}

/* Space below header */
.container {
  margin-top: 2.5rem;
}

/* Responsive */
@media (max-width: 480px) {
  .site-name {
    font-size: 1.2rem;
  }

  .site-logo {
    height: 32px;
  }

  .site-header {
    padding: 0.75rem 1rem;
  }
}

/* Universal Glow Button Style */
.glow-btn {
  background-color: transparent;
  color: var(--accent);
  border: 2px solid var(--accent);
  padding: 0.8rem 1.5rem;
  border-radius: 10px;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 0 0 transparent;
}

.glow-btn:hover {
  background-color: var(--accent);
  color: black;
  transform: translateY(-4px);
  box-shadow: 0 0 10px var(--accent), 0 0 20px var(--accent), 0 0 30px var(--accent);
}