/* Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  background-color: #0d1117;
  color: #f0f6fc;
  line-height: 1.6;
}

a {
  color: #58a6ff;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

h1, h2, h3 {
  font-weight: 600;
}

/* Hero */
.hero {
  text-align: center;
  padding: 100px 24px 80px;
  max-width: 800px;
  margin: 0 auto;
}

.hero h1 {
  font-size: 3.5rem;
  margin-bottom: 12px;
  background: linear-gradient(135deg, #58a6ff, #79c0ff);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.tagline {
  font-size: 1.5rem;
  color: #8b949e;
  margin-bottom: 16px;
}

.subtitle {
  font-size: 1.1rem;
  color: #8b949e;
  margin-bottom: 32px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: 12px 28px;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  transition: opacity 0.2s;
}

.btn:hover {
  text-decoration: none;
  opacity: 0.85;
}

.btn-primary {
  background-color: #58a6ff;
  color: #0d1117;
}

.btn-secondary {
  background-color: #21262d;
  color: #f0f6fc;
  border: 1px solid #30363d;
}

/* Sections */
section {
  max-width: 960px;
  margin: 0 auto;
  padding: 60px 24px;
}

section h2 {
  font-size: 2rem;
  margin-bottom: 32px;
  text-align: center;
}

/* Features */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
}

.feature-card {
  background-color: #161b22;
  border: 1px solid #30363d;
  border-radius: 12px;
  padding: 28px;
}

.feature-icon {
  font-size: 2rem;
  margin-bottom: 12px;
}

.feature-card h3 {
  font-size: 1.15rem;
  margin-bottom: 8px;
}

.feature-card p {
  color: #8b949e;
  font-size: 0.95rem;
}

/* Architecture */
.arch-layers {
  display: flex;
  flex-direction: column;
  gap: 2px;
  max-width: 500px;
  margin: 0 auto;
}

.arch-layer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 24px;
  border-radius: 8px;
  font-size: 0.95rem;
}

.arch-layer span {
  color: #8b949e;
}

.layer-domain {
  background-color: #1a3a2a;
  border: 1px solid #238636;
}

.layer-application {
  background-color: #1a2a3a;
  border: 1px solid #1f6feb;
}

.layer-infrastructure {
  background-color: #2a2a1a;
  border: 1px solid #f0883e;
}

.layer-presentation {
  background-color: #2a1a2a;
  border: 1px solid #c77dff;
}

.architecture p {
  text-align: center;
  color: #8b949e;
  margin-bottom: 24px;
}

/* Philosophy */
.philosophy > p {
  text-align: center;
  color: #8b949e;
  margin-bottom: 24px;
}

.philosophy-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
}

.philosophy-card {
  background-color: #161b22;
  border: 1px solid #30363d;
  border-radius: 12px;
  padding: 28px;
}

.philosophy-card h3 {
  font-size: 1.15rem;
  margin-bottom: 8px;
}

.philosophy-card p {
  color: #8b949e;
  font-size: 0.95rem;
}

/* Hero screenshot */
.hero-shot {
  padding-top: 0;
  padding-bottom: 40px;
  text-align: center;
}

.hero-shot img {
  max-width: 100%;
  height: auto;
  border-radius: 12px;
  border: 1px solid #30363d;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
}

/* Screenshot strip */
.shot-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}

.shot-card {
  background-color: #161b22;
  border: 1px solid #30363d;
  border-radius: 12px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.shot-card img {
  width: 100%;
  height: auto;
  display: block;
  border-bottom: 1px solid #30363d;
}

.shot-card figcaption {
  padding: 14px 18px;
  color: #8b949e;
  font-size: 0.9rem;
}

/* Footer */
.site-footer {
  border-top: 1px solid #30363d;
  padding: 32px 24px;
  text-align: center;
  color: #8b949e;
  font-size: 0.9rem;
}

.footer-content a {
  color: #58a6ff;
}

/* Responsive */
@media (max-width: 600px) {
  .hero h1 {
    font-size: 2.5rem;
  }

  .tagline {
    font-size: 1.2rem;
  }

  section {
    padding: 40px 16px;
  }
}