:root {
  --bg-hero: #020617;
  --bg-about: #02091a;
  --bg-skills: #020d20;
  --bg-projects: #021026;
  --bg-footer: #020617;

  --text: #e5e7eb;
  --card: #020617;
  --accent: #38bdf8;
}

/* Light mode overrides */
body.light {
  --accent: #2563eb;

  --bg-hero: #ffffff;
  --bg-about: #f8fafc;
  --bg-skills: #f1f5f9;
  --bg-projects: #e2e8f0;
  --bg-footer: #f1f5f9;

  --text: #020617;
  --card: #ffffff;
}

body {
  margin: 0;
  font-family: system-ui, sans-serif;
  color: var(--text);
  background: var(--bg-hero);
  transition: background 0.3s, color 0.3s;
}

/* ================= HERO ================= */
.hero {
  background: var(--bg-hero);
  text-align: center;
  padding: 20px 20px;
}

.hero h2 {
  margin: 1px 0;
  font-weight: 500;
}

.hero div {
  margin: 1px 0;
}

.profile {
  width: 140px;
  border-radius: 50%;
  border: 3px solid var(--accent);
}

.contact-description {
  display: inline-block;
  text-align: left;
  margin: 14px 0 18px;
  font-size: 0.95rem;
  line-height: 1.6;
}

.contact-description a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 500;
}

.contact-description a:hover {
  text-decoration: underline;
}

/* ================= SECTIONS ================= */
.section {
  width: 100%;
  padding: 10px 20px;
}

.container {
  max-width: 1000px;
  margin: auto;
}

.section-about { background: var(--bg-about); }
.section-skills { background: var(--bg-skills); }
.section-projects { background: var(--bg-projects); }
.section-footer { background: var(--bg-footer); }
.section-experience { background: var(--bg-about); }
.section-education { background: var(--bg-skills); }

/* ================= SKILLS ================= */
.skills span {
  display: inline-block;
  margin: 6px;
  padding: 8px 14px;
  background: var(--card);
  border-radius: 20px;
}

/* ================= PROJECTS ================= */
.projects {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
}

.card {
  background: var(--card);
  padding: 16px;
  border-radius: 12px;
  transition: transform 0.3s;
}

.card:hover {
  transform: translateY(-6px);
}

.card img {
  width: 100%;
  border-radius: 8px;
}

.card a {
  color: var(--accent);
  text-decoration: none;
}

/* ================= TIMELINE ================= */
.timeline {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.timeline-item {
  background: var(--card);
  padding: 18px 20px;
  border-radius: 12px;
}

.timeline-item h4 {
  margin: 0 0 4px;
}

.timeline-date {
  font-size: 0.9rem;
  color: var(--accent);
}

.timeline-item ul {
  padding-left: 18px;
  margin: 8px 0 0;
}

/* ================= FOOTER ================= */
footer {
  text-align: center;
}

footer a {
  color: var(--accent);
  font-weight: 600;
  text-decoration: none;
}

footer a:hover {
  text-decoration: underline;
}

/* ================= THEME TOGGLE ================= */
.theme-toggle {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 9999;
  background: var(--card);
  border: none;
  color: var(--text);
  padding: 12px;
  border-radius: 50%;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(0,0,0,0.25);
}

/* ================= ANIMATION ================= */
.fade {
  opacity: 0;
  transform: translateY(20px);
  animation: fadeIn 0.8s forwards;
}

@keyframes fadeIn {
  to {
    opacity: 1;
    transform: none;
  }
}