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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background-color: #0d1117;
  color: #c9d1d9;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a {
  color: #58a6ff;
  text-decoration: none;
  transition: color 0.2s;
}

a:hover {
  color: #79c0ff;
  text-decoration: underline;
}

img {
  display: block;
  max-width: 100%;
}

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section {
  padding: 5rem 0;
}

.section-alt {
  background-color: #161b22;
  border-top: 1px solid #21262d;
  border-bottom: 1px solid #21262d;
}

.section-title {
  font-size: 1.75rem;
  font-weight: 700;
  color: #f0f6fc;
  margin-bottom: 2rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid #21262d;
}

/* ===== NAV ===== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background-color: rgba(13, 17, 23, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid #21262d;
  transition: background-color 0.3s, box-shadow 0.3s;
}

.nav.scrolled {
  box-shadow: 0 1px 8px rgba(0, 0, 0, 0.3);
}

.nav-inner {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}

.nav-logo {
  font-size: 1.15rem;
  font-weight: 700;
  color: #f0f6fc;
  letter-spacing: -0.02em;
}

.nav-logo:hover {
  color: #58a6ff;
  text-decoration: none;
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 1.5rem;
}

.nav-links a {
  color: #8b949e;
  font-size: 0.9rem;
  font-weight: 500;
}

.nav-links a:hover {
  color: #f0f6fc;
  text-decoration: none;
}

/* ==== LANGUAGE TOGGLE ==== */
.lang-toggle-item {
  margin-left: 0.5rem;
}

.lang-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0;
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.12), rgba(59, 130, 246, 0.12));
  border: 1px solid rgba(139, 92, 246, 0.45);
  border-radius: 6px;
  padding: 0.3rem 0.35rem;
  cursor: pointer;
  font-family: "JetBrains Mono", "Cascadia Code", Consolas, monospace;
  font-size: 0.75rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.lang-toggle:hover {
  border-color: rgba(139, 92, 246, 0.8);
  box-shadow: 0 0 8px rgba(139, 92, 246, 0.25);
}

.lang-option {
  padding: 0.2rem 0.4rem;
  border-radius: 4px;
  color: #8b949e;
  font-weight: 600;
  transition: all 0.2s;
}

.lang-option.active {
  color: #fff;
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.5), rgba(59, 130, 246, 0.5));
  box-shadow: 0 0 6px rgba(139, 92, 246, 0.3);
}

.lang-option:not(.active) {
  cursor: pointer;
}

.lang-option:not(.active):hover {
  color: #e2e8f0;
  background-color: rgba(139, 92, 246, 0.15);
}

.lang-sep {
  color: rgba(139, 92, 246, 0.35);
  margin: 0 0.15rem;
  user-select: none;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background-color: #8b949e;
  border-radius: 1px;
  transition: all 0.3s;
}

/* ===== HERO ===== */
.hero {
  padding: 8rem 0 5rem;
  text-align: center;
}

.hero-avatar img {
  width: 96px;
  height: 96px;
  border-radius: 50%;
  margin: 0 auto 1.5rem;
  border: 2px solid #30363d;
}

.hero-name {
  font-size: 2.25rem;
  font-weight: 800;
  color: #f0f6fc;
  letter-spacing: -0.03em;
  margin-bottom: 0.25rem;
}

.hero-handle {
  font-size: 1.1rem;
  color: #8b949e;
  font-family: "JetBrains Mono", "Cascadia Code", Consolas, monospace;
  margin-bottom: 1rem;
}

.hero-bio {
  font-size: 1.1rem;
  color: #8b949e;
  max-width: 520px;
  margin: 0 auto 2rem;
  line-height: 1.7;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 2.5rem;
  margin-bottom: 1.25rem;
}

.stat {
  text-align: center;
}

.stat-value {
  display: block;
  font-size: 1.6rem;
  font-weight: 700;
  color: #58a6ff;
  font-family: "JetBrains Mono", "Cascadia Code", Consolas, monospace;
}

.stat-pulse {
  animation: statPulse 1.2s ease-in-out infinite;
}

@keyframes statPulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

.stat-label {
  font-size: 0.8rem;
  color: #8b949e;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.hero-meta {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  flex-wrap: wrap;
  margin-bottom: 2rem;
}

.meta-item {
  font-size: 0.9rem;
  color: #8b949e;
  padding: 0.25rem 0.75rem;
  background-color: #161b22;
  border: 1px solid #21262d;
  border-radius: 999px;
}

.meta-item.achievement {
  color: #3fb950;
  border-color: rgba(63, 185, 80, 0.3);
  background-color: rgba(63, 185, 80, 0.08);
}

.hero-links {
  display: flex;
  justify-content: center;
  gap: 1rem;
}

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.6rem 1.25rem;
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: 6px;
  transition: all 0.2s;
  cursor: pointer;
}

.btn:hover {
  text-decoration: none;
}

.btn-primary {
  background-color: #238636;
  color: #fff;
  border: 1px solid rgba(240, 246, 252, 0.1);
}

.btn-primary:hover {
  background-color: #2ea043;
  color: #fff;
}

.btn-outline {
  background-color: transparent;
  color: #c9d1d9;
  border: 1px solid #30363d;
}

.btn-outline:hover {
  border-color: #58a6ff;
  color: #58a6ff;
}

/* ===== ABOUT ===== */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  align-items: start;
}

.about-text p {
  color: #8b949e;
  margin-bottom: 1rem;
  line-height: 1.75;
}

.about-text strong {
  color: #c9d1d9;
}

.about-cards {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.about-card {
  padding: 1.25rem;
  background-color: #161b22;
  border: 1px solid #21262d;
  border-radius: 8px;
}

.about-card-icon {
  font-size: 1.4rem;
  margin-bottom: 0.5rem;
}

.about-card h3 {
  font-size: 0.95rem;
  font-weight: 600;
  color: #f0f6fc;
  margin-bottom: 0.35rem;
}

.about-card p {
  font-size: 0.85rem;
  color: #8b949e;
  line-height: 1.55;
}

/* ===== SKILLS ===== */
.skills-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.skill-tag {
  display: inline-block;
  padding: 0.35rem 0.85rem;
  font-size: 0.85rem;
  font-weight: 500;
  color: #58a6ff;
  background-color: rgba(88, 166, 255, 0.08);
  border: 1px solid rgba(88, 166, 255, 0.2);
  border-radius: 999px;
  transition: all 0.2s;
}

.skill-tag:hover {
  background-color: rgba(88, 166, 255, 0.14);
  border-color: rgba(88, 166, 255, 0.4);
}

/* ===== CATEGORIES ===== */
.category-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: #f0f6fc;
  margin: 2.5rem 0 1rem;
  padding-left: 0.75rem;
  border-left: 3px solid #58a6ff;
}

/* ===== PROJECT GRID ===== */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
  margin-bottom: 1rem;
}

.project-card {
  background-color: #161b22;
  border: 1px solid #21262d;
  border-radius: 8px;
  padding: 1.25rem;
  transition: border-color 0.2s, transform 0.15s;
}

.project-card:hover {
  border-color: #30363d;
  transform: translateY(-2px);
}

.project-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  margin-bottom: 0.6rem;
}

.project-name {
  font-size: 0.95rem;
  font-weight: 600;
}

.project-name a {
  color: #58a6ff;
}

.project-name a:hover {
  color: #79c0ff;
  text-decoration: none;
}

.project-lang {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 0.15rem 0.55rem;
  border-radius: 999px;
  white-space: nowrap;
  flex-shrink: 0;
}

.lang-ts  { color: #3178c6; background-color: rgba(49, 120, 198, 0.12); }
.lang-cs  { color: #9b4d96; background-color: rgba(155, 77, 150, 0.12); }
.lang-js  { color: #f0db4f; background-color: rgba(240, 219, 79, 0.12); }
.lang-py  { color: #3572a5; background-color: rgba(53, 114, 165, 0.12); }
.lang-html{ color: #e34c26; background-color: rgba(227, 76, 38, 0.12); }
.lang-css { color: #563d7c; background-color: rgba(86, 61, 124, 0.12); }
.lang-kt  { color: #7f52ff; background-color: rgba(127, 82, 255, 0.12); }
.lang-java{ color: #b07219; background-color: rgba(176, 114, 25, 0.12); }
.lang-php { color: #4f5d95; background-color: rgba(79, 93, 149, 0.12); }
.lang-jupyter { color: #da5b0b; background-color: rgba(218, 91, 11, 0.12); }

.project-desc {
  font-size: 0.83rem;
  color: #8b949e;
  line-height: 1.55;
  margin-bottom: 0.75rem;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.project-tags span {
  font-size: 0.7rem;
  color: #484f58;
  background-color: #0d1117;
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
}

.project-badge {
  font-size: 0.7rem;
  font-weight: 600;
  color: #8b949e;
  background-color: #21262d;
  padding: 0.1rem 0.5rem;
  border-radius: 999px;
  white-space: nowrap;
}

.unmapped-loading {
  text-align: center;
  padding: 2rem 1rem;
  color: #484f58;
  font-size: 0.9rem;
}

.unmapped-empty {
  text-align: center;
  padding: 1.5rem 1rem;
  color: #484f58;
  font-size: 0.85rem;
}

/* ===== FOOTER ===== */
.footer {
  padding: 3rem 0;
  text-align: center;
  border-top: 1px solid #21262d;
}

.footer p {
  font-size: 0.85rem;
  color: #8b949e;
  margin-bottom: 0.25rem;
}

.footer a {
  color: #58a6ff;
}

.footer-tagline {
  font-size: 0.8rem;
  color: #484f58;
}

/* ===== ANIMATIONS ===== */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  .hero {
    padding: 6rem 0 3.5rem;
  }

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

  .hero-stats {
    gap: 1.5rem;
  }

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

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

  .nav-links {
    position: fixed;
    top: 56px;
    left: 0;
    right: 0;
    flex-direction: column;
    background-color: #161b22;
    border-bottom: 1px solid #21262d;
    padding: 1rem 1.5rem;
    gap: 0.75rem;
    display: none;
  }

  .nav-links.open {
    display: flex;
  }

  .lang-toggle-item {
    margin-left: 0;
    align-self: flex-start;
  }

  .nav-toggle {
    display: flex;
  }
}