:root {
  --bg-main: #0f172a;
  --bg-card: #1e293b;
  --bg-darker: #0b0f19;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --primary: #38bdf8;
  --primary-hover: #0284c7;
  --border-color: #334155;
  --radius: 12px;
}

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

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

.container { 
  max-width: 1100px; 
  margin: 0 auto; 
  padding: 0 20px; 
}

.section { 
  padding: 60px 0; 
}

.section.dark-bg { 
  background: var(--bg-darker); 
}

/* Navigation */
.navbar {
  position: sticky;
  top: 0;
  background: rgba(15, 23, 42, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border-color);
  z-index: 100;
  padding: 14px 0;
}

.nav-container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-logo { 
  font-size: 1.25rem; 
  font-weight: 800; 
  color: white; 
  text-decoration: none; 
}

.nav-logo span { 
  color: var(--primary); 
}

.nav-links { 
  display: flex; 
  gap: 18px; 
  align-items: center; 
}

.nav-links a { 
  color: var(--text-muted); 
  text-decoration: none; 
  font-weight: 600; 
  font-size: 0.9rem; 
}

.nav-links a:hover { 
  color: white; 
}

/* Buttons */
.btn {
  padding: 10px 18px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 0.9rem;
}

.btn-primary { 
  background: var(--primary); 
  color: #0f172a; 
}

.btn-primary:hover { 
  background: var(--primary-hover); 
  color: white; 
}

.btn-secondary { 
  background: var(--bg-card); 
  color: white; 
  border: 1px solid var(--border-color); 
}

.btn-lg { 
  padding: 12px 24px; 
  font-size: 0.95rem; 
}

/* Hero */
.hero { 
  text-align: center; 
  padding: 70px 20px 50px; 
}

.hero-container { 
  max-width: 750px; 
  margin: 0 auto; 
}

.badge {
  display: inline-block;
  background: rgba(56, 189, 248, 0.1);
  color: var(--primary);
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.hero h1 { 
  font-size: 2.2rem; 
  font-weight: 900; 
  line-height: 1.25; 
  margin-bottom: 14px; 
}

.hero p { 
  font-size: 1rem; 
  color: var(--text-muted); 
  margin-bottom: 24px; 
}

.hero-btns { 
  display: flex; 
  justify-content: center; 
  gap: 12px; 
  flex-wrap: wrap; 
}

/* Projects Grid */
.section-header { 
  text-align: center; 
  margin-bottom: 40px; 
}

.section-header h2 { 
  font-size: 1.8rem; 
  font-weight: 800; 
}

.section-header p { 
  color: var(--text-muted); 
  font-size: 0.95rem; 
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 20px;
  display: flex;
  flex-direction: column;
}

.project-tag {
  color: var(--primary);
  font-size: 0.75rem;
  font-weight: 800;
  text-transform: uppercase;
  margin-bottom: 8px;
}

.project-card h3 { 
  font-size: 1.2rem; 
  margin-bottom: 8px; 
}

.project-card p { 
  color: var(--text-muted); 
  font-size: 0.88rem; 
  flex-grow: 1; 
  margin-bottom: 16px; 
}

.tech-stack { 
  display: flex; 
  flex-wrap: wrap; 
  gap: 6px; 
  margin-bottom: 18px; 
}

.tech-stack span {
  background: var(--bg-main);
  border: 1px solid var(--border-color);
  font-size: 0.72rem;
  padding: 4px 8px;
  border-radius: 6px;
  color: var(--text-muted);
}

.project-links { 
  display: flex; 
  gap: 14px; 
}

.link-btn {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--primary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 6px;
}

.link-btn.secondary { 
  color: var(--text-muted); 
}

/* Skills */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 14px;
}

.skill-box {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: 16px;
  border-radius: var(--radius);
  font-weight: 700;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: 10px;
}

.skill-box i { 
  color: var(--primary); 
  font-size: 1.1rem; 
}

/* Footer */
.footer { 
  text-align: center; 
  border-top: 1px solid var(--border-color); 
  padding: 60px 0 30px; 
}

.footer h2 { 
  margin-bottom: 8px; 
  font-size: 1.6rem; 
}

.footer p { 
  color: var(--text-muted); 
  margin-bottom: 20px; 
  font-size: 0.95rem; 
}

.footer-bottom { 
  margin-top: 40px; 
  font-size: 0.82rem; 
  color: var(--text-muted); 
}

/* --- Mobile Responsiveness Adjustments --- */
@media (max-width: 640px) {
  .nav-container {
    flex-direction: column;
    gap: 12px;
  }

  .nav-links {
    gap: 12px;
    font-size: 0.85rem;
  }

  .hero h1 {
    font-size: 1.75rem;
  }

  .hero-btns {
    flex-direction: column;
    width: 100%;
  }

  .hero-btns .btn {
    width: 100%;
  }

  .projects-grid {
    grid-template-columns: 1fr;
  }

  .skills-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}