/* ===== DESIGN TOKENS ===== */
:root {
  /* Backgrounds */
  --color-bg: #021024;
  --color-surface: #052659;

  /* Brand */
  --color-primary: #5483B3;
  --color-secondary: #7DA0CA;

  /* Text */
  --color-text: #C1E8FF;
  --color-muted: #7DA0CA;

  /* Borders */
  --color-border: #5483B3;

  /* Spacing */
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 2rem;
  --space-xl: 4rem;

  /* Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
}

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

/* ===== BASE ===== */
body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    Roboto, Oxygen, Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
  line-height: 1.6;
  background-color: var(--color-bg);
  color: var(--color-text);
}

/* ===== GLOBAL ===== */
a {
  color: inherit;
  text-decoration: none;
}

ul {
  list-style: none;
}

p {
  max-width: 60ch;
  color: var(--color-muted);
}

/* ===== LAYOUT ===== */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1rem;
}

/* ===== HEADER / NAV ===== */
header {
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
}

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-md) 0;
}

nav ul {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.nav-link {
  padding-bottom: 0.25rem;
  transition: color 0.2s ease;
}

.nav-link:hover {
  color: var(--color-secondary);
}

.nav-link.active {
  color: var(--color-primary);
  border-bottom: 2px solid var(--color-primary);
}

/* ===== HERO ===== */
#hero {
  padding: var(--space-xl) 0;
}

#hero h2 {
  margin-bottom: var(--space-md);
  color: var(--color-text);
}

/* ===== SECTIONS ===== */
section {
  padding: 2rem 0;
  margin-bottom: 3rem;
}

h1 {
  font-size: 1.4rem;
  color: var(--color-text);
}

h2 {
  font-size: 1.8rem;
  margin-bottom: 1rem;
  position: relative;
}

h2::after {
  content: "";
  display: block;
  width: 40px;
  height: 3px;
  background-color: var(--color-primary);
  margin-top: 0.5rem;
}

/* ===== PROJECTS ===== */
.projects-grid {
  display: grid;
  gap: var(--space-lg);
}

.project-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  padding: var(--space-lg);
  border-radius: var(--radius-md);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.project-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 15px 30px rgba(0, 0, 0, 0.4);
}

.project-card h3 {
  margin-bottom: var(--space-sm);
  color: var(--color-text);
}

.project-tech {
  display: flex;
  gap: var(--space-sm);
  margin: var(--space-md) 0;
  font-size: 0.9rem;
}

.project-tech li {
  background-color: var(--color-bg);
  color: var(--color-secondary);
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius-sm);
}

.project-links {
  display: flex;
  gap: var(--space-md);
}

.project-links a {
  background-color: var(--color-primary);
  color: var(--color-bg);
  padding: 0.45rem 0.9rem;
  border-radius: var(--radius-sm);
  font-weight: 500;
  transition: background-color 0.2s ease, transform 0.2s ease;
}

.project-links a:hover {
  background-color: var(--color-secondary);
  transform: translateY(-2px);
}

/* ===== CONTACT ===== */
.contact-list {
  margin-top: var(--space-lg);
}

.contact-list li {
  margin-bottom: var(--space-sm);
}

.contact-list a {
  color: var(--color-secondary);
}

.contact-list a:hover {
  color: var(--color-primary);
}

/* ===== FOOTER ===== */
footer {
  border-top: 1px solid var(--color-border);
  margin-top: var(--space-xl);
  background-color: var(--color-bg);
}

/* ===== RESPONSIVE ===== */
@media (min-width: 768px) {
  h1 {
    font-size: 1.6rem;
  }

  h2 {
    font-size: 2.2rem;
  }

  nav ul {
    gap: 2rem;
  }

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