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

html {
  scroll-behavior: smooth;
}

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #f8fafc;            /* soft white */
  color: #1e293b;                 /* dark slate text */
  line-height: 1.7;
}

/* Layout container */
.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 1.5rem;
}

/* Header */
.site-header {
  background: white;
  border-bottom: 1px solid #e2e8f0;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1.5rem;
}

.site-title {
  font-size: 1.8rem;
  font-weight: 700;
  color: #1e293b;
}

.site-subtitle {
  font-size: 0.95rem;
  color: #64748b;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.brand-logo {
  width: 160px;      
  height: 160px;
  object-fit: contain;
  border-radius: 10px;  
}

.brand-text {
  display: flex;
  flex-direction: column;
}

/* Navigation */
.nav {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.nav-link {
  text-decoration: none;
  color: #1e293b;
  font-size: 0.95rem;
  padding: 0.4rem 0.9rem;
  border-radius: 8px;
  transition: 0.15s ease;
}

.nav-link:hover {
  background: #e2e8f0;
}

.nav-link.active {
  background: #2563eb;
  color: white;
}

/* Cards */
.card {
  background: white;
  padding: 1.8rem;
  border-radius: 14px;
  border: 1px solid #e2e8f0;
  box-shadow: 0 3px 8px rgba(0,0,0,0.06);
  margin-bottom: 1.75rem;
}

.card h2 {
  font-size: 1.4rem;
  margin-bottom: 0.8rem;
}

.hero h2 {
  font-size: 1.7rem;
}

/* Grid */
.grid {
  display: grid;
  gap: 1.2rem;
}

.grid-item h3 {
  font-size: 1.15rem;
  margin-bottom: 0.35rem;
  color: #1e293b;
}

/* Links */
a {
  color: #2563eb;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* Download list */
.download-list {
  list-style: none;
  margin-top: 1.2rem;
}

.download-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 1rem 0;
  border-top: 1px solid #e2e8f0;
}

.download-item:first-child {
  border-top: none;
}

.download-meta {
  font-size: 0.85rem;
  color: #64748b;
}

/* Button */
.btn {
  background: #2563eb;
  color: white;
  padding: 0.55rem 1rem;
  border-radius: 8px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  text-decoration: none;
  transition: 0.15s ease;
  white-space: nowrap;
}

.btn:hover {
  background: #1e40af;
}

/* Footer */
.site-footer {
  text-align: center;
  padding: 2rem 0;
  color: #64748b;
  font-size: 0.85rem;
}

/* Hero with photo */
.hero-flex {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.profile-photo {
  width: 140px;
  height: 140px;
  border-radius: 12px;    
  object-fit: cover;        
  box-shadow: 0 4px 10px rgba(15, 23, 42, 0.18);
}

.hero-text {
  flex: 1;
}

/* Responsive */
@media (max-width: 640px) {
  .header-content {
    flex-direction: column;
    align-items: flex-start;
  }

  .download-item {
    flex-direction: column;
    align-items: flex-start;
  }

  .btn {
    width: 100%;
    justify-content: center;
  }

  /* hero layout on small screens */
  .hero-flex {
    flex-direction: column;
    text-align: left; /* or center if you prefer */
  }

  .profile-photo {
    width: 160px;
    height: 160px;
  }
}