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

:root {
  --color-bg: #0d1117;
  --color-bg-alt: #161b22;
  --color-surface: #1c2128;
  --color-border: #30363d;
  --color-text: #e6edf3;
  --color-text-muted: #8b949e;
  --color-primary: #58a6ff;
  --color-primary-hover: #79bbff;
  --color-accent: #3fb950;
  --color-tag-bg: #21262d;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  --max-width: 1100px;
  --radius: 10px;
  --transition: 0.25s ease;
}

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

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition);
}

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

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

ul {
  list-style: none;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ===== Header / Nav ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  background: rgba(13, 17, 23, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-logo {
  font-size: 1.25rem;
  font-weight: 700;
  font-family: var(--font-mono);
  color: var(--color-text);
}

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

.nav-links {
  display: flex;
  gap: 2rem;
}

.nav-links a {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  font-weight: 500;
  transition: color var(--transition);
}

.nav-links a:hover {
  color: var(--color-text);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--color-text);
  font-size: 1.5rem;
  cursor: pointer;
}

/* ===== Hero ===== */
.hero {
  padding: 10rem 0 5rem;
  text-align: center;
  background: radial-gradient(ellipse at top, rgba(88, 166, 255, 0.08) 0%, transparent 60%);
}

.hero-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.hero-avatar {
  width: 150px;
  height: 150px;
  border-radius: 50%;
  border: 3px solid var(--color-border);
  box-shadow: 0 0 40px rgba(88, 166, 255, 0.15);
}

.hero-name {
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.hero-tagline {
  font-size: 1.2rem;
  color: var(--color-primary);
  font-weight: 600;
}

.hero-bio {
  color: var(--color-text-muted);
  max-width: 500px;
  font-size: 1.05rem;
}

.hero-stats {
  display: flex;
  gap: 2.5rem;
  margin-top: 1rem;
}

.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.stat-value {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text);
}

.stat-label {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  margin-top: 1rem;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.7rem 1.5rem;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.95rem;
  transition: all var(--transition);
  border: 1px solid transparent;
}

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

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

.btn-secondary {
  background: transparent;
  border-color: var(--color-border);
  color: var(--color-text);
}

.btn-secondary:hover {
  border-color: var(--color-text-muted);
  color: var(--color-primary);
}

.icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

/* ===== Sections ===== */
.section {
  padding: 5rem 0;
}

.section-alt {
  background: var(--color-bg-alt);
}

.section-title {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 2.5rem;
  text-align: center;
  letter-spacing: -0.01em;
}

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

.about-text p {
  color: var(--color-text-muted);
  font-size: 1.05rem;
  margin-bottom: 1.5rem;
}

.about-text strong {
  color: var(--color-text);
}

.about-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.about-list li {
  color: var(--color-text-muted);
  padding-left: 1.5rem;
  position: relative;
}

.about-list li::before {
  content: "▸";
  position: absolute;
  left: 0;
  color: var(--color-primary);
  font-weight: bold;
}

.about-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 2rem;
}

.about-card h3 {
  margin-bottom: 1rem;
  font-size: 1.2rem;
}

.about-card ul {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.about-card li {
  color: var(--color-text-muted);
  padding-left: 1.5rem;
  position: relative;
}

.about-card li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-weight: bold;
}

/* ===== Skills ===== */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
}

.skill-group {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5rem;
}

.skill-group h3 {
  font-size: 1rem;
  color: var(--color-text-muted);
  margin-bottom: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 600;
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tag {
  background: var(--color-tag-bg);
  border: 1px solid var(--color-border);
  color: var(--color-text);
  padding: 0.4rem 0.9rem;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 500;
  transition: all var(--transition);
}

.tag:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

/* ===== Projects ===== */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem;
}

.project-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  transition: border-color var(--transition), transform var(--transition);
}

.project-card:hover {
  border-color: var(--color-primary);
  transform: translateY(-2px);
}

.project-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.project-card-title {
  font-size: 1.15rem;
  font-weight: 700;
}

.project-card-title a {
  color: var(--color-text);
}

.project-card-title a:hover {
  color: var(--color-primary);
}

.project-card-desc {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  flex-grow: 1;
}

.project-card-meta {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.project-card-meta span {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
}

.lang-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  display: inline-block;
}

.project-card-topics {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.topic-tag {
  background: rgba(88, 166, 255, 0.1);
  color: var(--color-primary);
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 500;
}

.loading {
  text-align: center;
  color: var(--color-text-muted);
  padding: 3rem 0;
  grid-column: 1 / -1;
}

/* ===== Contact ===== */
.contact-container {
  text-align: center;
}

.contact-text {
  color: var(--color-text-muted);
  font-size: 1.1rem;
  max-width: 600px;
  margin: 0 auto 2rem;
}

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

/* ===== Footer ===== */
.footer {
  text-align: center;
  padding: 2rem 0;
  color: var(--color-text-muted);
  font-size: 0.85rem;
  border-top: 1px solid var(--color-border);
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    width: 100%;
    background: rgba(13, 17, 23, 0.97);
    flex-direction: column;
    padding: 1.5rem;
    gap: 1rem;
    border-bottom: 1px solid var(--color-border);
  }

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

  .nav-toggle {
    display: block;
  }

  .hero {
    padding: 8rem 0 3rem;
  }

  .hero-name {
    font-size: 2rem;
  }

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

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

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

  .hero-actions {
    flex-direction: column;
    align-items: center;
  }
}