/* ===== Global Variables ===== */
:root {
  --primary: #03dac6;
  --background: #121212;
  --surface: #1e1e1e;
  --on-surface: #ffffff;
  --text-muted: #b0b0b0;
  --accent: #03dac6;
  --shadow: rgba(0, 0, 0, 0.3);
}

/* ===== Base Styles ===== */
body {
  margin: 0;
  font-family: 'Roboto', sans-serif;
  background-color: var(--background);
  color: var(--on-surface);
  scroll-behavior: smooth;
}

h1, h2, h3 {
  margin: 0;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.3s;
}

a:hover {
  color: #80ffe7;
}

/* ===== App Bar ===== */
.app-bar {
  background-color: var(--surface);
  box-shadow: 0 2px 6px var(--shadow);
  position: fixed;
  width: 100%;
  z-index: 1000;
  padding: 0.8rem 1rem;
}

.app-bar-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1200px;
  margin: 0 auto;
}

.logo {
  vertical-align: middle;
  margin-right: 0.5rem;
  color: var(--accent);
}

.nav-links a {
  margin: 0 0.8rem;
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  transition: opacity 0.3s;
}

.nav-links a:hover {
  opacity: 0.8;
}

/* ===== Hero Section ===== */
.hero {
  padding: 120px 1rem 60px;
  display: flex;
  justify-content: center;
  align-items: center;
  text-align: center;
  flex-direction: column;
}

.hero-content {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 2rem;
}

.hero-text h2 {
  font-size: 2rem;
  font-weight: 600;
  color: var(--accent);
}

.hero-text p.subtitle {
  color: var(--text-muted);
  margin: 0.5rem 0 1.5rem;
  font-size: 1.1rem;
}

.hero-avatar {
  width: 180px;
  height: 180px;
}

.tech-avatar {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  animation: rotate 20s linear infinite;
  background: conic-gradient(from 0deg, var(--accent), #80ffe7, var(--accent));
}

@keyframes rotate {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* ===== Sections ===== */
.section {
  max-width: 1100px;
  margin: 3rem auto;
  padding: 0 1rem;
}

.section h2 {
  font-size: 2rem;
  color: var(--accent);
  margin-bottom: 1.5rem;
}

/* ===== Cards Container ===== */
.cards-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
}

/* ===== Individual Cards ===== */
.card {
  background: rgba(30, 30, 30, 0.8);
  backdrop-filter: blur(10px);
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: 0 2px 10px var(--shadow);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: 0 8px 20px var(--shadow);
}

.card h3 {
  margin: 0.5rem 0;
}

.card p {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin: 0.3rem 0;
}

.card a {
  display: inline-block;
  margin-top: 0.5rem;
  color: var(--accent);
}

.card a:hover {
  color: #80ffe7;
}

/* ===== Sidebar ===== */
.sidebar {
  position: fixed;
  top: 50%;
  right: 1rem;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}

.sidebar a {
  background: var(--surface);
  color: var(--accent);
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 8px var(--shadow);
  transition: all 0.3s;
}

.sidebar a:hover {
  background: var(--accent);
  color: #000;
  transform: scale(1.15);
}

/* ===== Footer ===== */
.footer {
  text-align: center;
  padding: 2rem 1rem;
  background: var(--surface);
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

/* ===== Fade-in Animation ===== */
.card, .hero-text, .hero-avatar {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.card.visible, .hero-text.visible, .hero-avatar.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  .hero-content {
    flex-direction: column;
  }
  .sidebar {
    right: 0.5rem;
  }
}