/* ===========================
   ROOT & RESET
=========================== */
:root {
  --bg: #0d1117;
  --bg2: #161b22;
  --bg3: #21262d;
  --border: #30363d;
  --text: #e6edf3;
  --text-muted: #8b949e;
  --accent: #58a6ff;
  --accent2: #79c0ff;
  --green: #3fb950;
  --red: #f78166;
  --yellow: #d29922;
  --card-shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
  --radius: 12px;
  --nav-h: 64px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-h);
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent2); }
ul { list-style: none; }

/* ===========================
   UTILITIES
=========================== */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

.accent { color: var(--accent); }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  border: 2px solid transparent;
}
.btn-primary {
  background: var(--accent);
  color: #0d1117;
}
.btn-primary:hover {
  background: var(--accent2);
  color: #0d1117;
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(88, 166, 255, 0.3);
}
.btn-outline {
  border-color: var(--border);
  color: var(--text);
  background: transparent;
}
.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
}

.section-title {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 700;
  margin-bottom: 8px;
  position: relative;
  display: inline-block;
}
.section-title::after {
  content: '';
  display: block;
  width: 48px;
  height: 3px;
  background: var(--accent);
  border-radius: 2px;
  margin-top: 8px;
}
.section-subtitle {
  color: var(--text-muted);
  margin-bottom: 48px;
  font-size: 17px;
}

/* ===========================
   NAVBAR
=========================== */
#navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-h);
  z-index: 100;
  background: rgba(13, 17, 23, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s;
}
#navbar.scrolled { border-color: var(--border); }

.nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-family: 'JetBrains Mono', monospace;
  font-size: 20px;
  font-weight: 500;
  color: var(--accent);
  letter-spacing: 2px;
}

.nav-links {
  display: flex;
  gap: 32px;
}
.nav-links a {
  color: var(--text-muted);
  font-size: 15px;
  font-weight: 500;
  transition: color 0.2s;
}
.nav-links a:hover { color: var(--text); }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: all 0.3s;
}

/* ===========================
   HERO
=========================== */
#hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: calc(var(--nav-h) + 48px) 24px 80px;
  max-width: 1100px;
  margin: 0 auto;
  gap: 64px;
}

.hero-content { flex: 1; }
.hero-greeting {
  font-family: 'JetBrains Mono', monospace;
  color: var(--accent);
  font-size: 16px;
  margin-bottom: 12px;
  letter-spacing: 1px;
}
.hero-name {
  font-size: clamp(40px, 7vw, 72px);
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: 16px;
}
.hero-title {
  font-size: clamp(20px, 3vw, 28px);
  color: var(--text-muted);
  font-weight: 400;
  margin-bottom: 20px;
}
.hero-subtitle {
  color: var(--text-muted);
  font-size: 17px;
  max-width: 500px;
  margin-bottom: 40px;
}
.hero-cta { display: flex; gap: 16px; flex-wrap: wrap; }

/* Code block decoration */
.hero-visual { flex: 1; max-width: 460px; }
.code-block {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--card-shadow);
}
.code-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  background: var(--bg3);
  border-bottom: 1px solid var(--border);
}
.dot { width: 12px; height: 12px; border-radius: 50%; }
.dot.red { background: #ff5f57; }
.dot.yellow { background: #febc2e; }
.dot.green { background: #28c840; }
.code-filename {
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  color: var(--text-muted);
  margin-left: 4px;
}
.code-body {
  font-family: 'JetBrains Mono', monospace;
  font-size: 14px;
  line-height: 1.8;
  padding: 24px;
  white-space: pre;
  overflow-x: auto;
}
.code-body .kw  { color: #ff7b72; }
.code-body .var { color: var(--accent); }
.code-body .prop{ color: #79c0ff; }
.code-body .str { color: #a5d6ff; }

/* ===========================
   ABOUT
=========================== */
#about {
  padding: 100px 0;
  background: var(--bg2);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: start;
}
.about-text p {
  color: var(--text-muted);
  margin-bottom: 16px;
  font-size: 16px;
}
.about-text p:last-child { margin-bottom: 0; }

.skills-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
.skill-group h3 {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
}
.skill-group li {
  color: var(--text-muted);
  font-size: 14px;
  padding: 4px 0;
  display: flex;
  align-items: center;
  gap: 8px;
}
.skill-group li::before {
  content: '▹';
  color: var(--accent);
  flex-shrink: 0;
}

/* ===========================
   PROJECTS
=========================== */
#projects { padding: 100px 0; }
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 24px;
}

.project-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.project-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
  box-shadow: 0 8px 32px rgba(88, 166, 255, 0.12);
}
.project-card.featured {
  grid-column: 1 / -1;
  flex-direction: row;
  gap: 32px;
  align-items: flex-start;
}
.project-card.featured .project-top { display: none; }

.project-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
}
.project-icon { color: var(--accent); }
.project-links {
  display: flex;
  gap: 12px;
}
.project-links a {
  color: var(--text-muted);
  transition: color 0.2s;
}
.project-links a:hover { color: var(--text); }

.project-title {
  font-size: 20px;
  font-weight: 600;
  margin: 0;
}
.project-card.featured .project-title { font-size: 22px; }
.project-desc {
  color: var(--text-muted);
  font-size: 15px;
  flex: 1;
}
.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.project-tags span {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  color: var(--accent);
  background: rgba(88, 166, 255, 0.1);
  border: 1px solid rgba(88, 166, 255, 0.25);
  padding: 3px 10px;
  border-radius: 20px;
}
.project-card.featured .project-body {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* ===========================
   CV
=========================== */
#cv {
  padding: 100px 0;
  background: var(--bg2);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.cv-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}
.cv-block { margin-bottom: 40px; }
.cv-block:last-child { margin-bottom: 0; }

.cv-block-title {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 20px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}
.cv-item {
  padding: 16px 0;
  border-bottom: 1px solid var(--border);
}
.cv-item:last-child { border-bottom: none; }
.cv-item-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 4px;
}
.cv-item-title {
  font-weight: 600;
  font-size: 16px;
}
.cv-item-date {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  color: var(--accent);
  background: rgba(88, 166, 255, 0.1);
  padding: 2px 8px;
  border-radius: 4px;
  white-space: nowrap;
}
.cv-item-sub {
  color: var(--text-muted);
  font-size: 14px;
  display: block;
  margin-bottom: 8px;
}
.cv-item-desc {
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1.6;
}

/* Skill bars */
.skill-bars { display: flex; flex-direction: column; gap: 14px; }
.skill-bar-item { display: flex; flex-direction: column; gap: 6px; }
.skill-bar-item > span { font-size: 14px; color: var(--text-muted); }
.bar {
  height: 6px;
  background: var(--bg3);
  border-radius: 3px;
  overflow: hidden;
}
.bar-fill {
  height: 100%;
  width: var(--w);
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  border-radius: 3px;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 1s cubic-bezier(0.16, 1, 0.3, 1);
}
.bar-fill.animated { transform: scaleX(1); }

.cv-download {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}
.cv-download p {
  color: var(--text-muted);
  font-size: 16px;
}

/* ===========================
   CONTACT
=========================== */
#contact {
  padding: 100px 0;
  text-align: center;
}
#contact .section-title::after { margin: 8px auto 0; }
#contact .section-subtitle { max-width: 500px; margin: 8px auto 48px; }

.contact-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
}
.contact-card {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 24px;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-size: 15px;
  transition: all 0.2s;
}
.contact-card:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(88, 166, 255, 0.1);
}

/* ===========================
   FOOTER
=========================== */
footer {
  text-align: center;
  padding: 32px 24px;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 14px;
}

/* ===========================
   RESPONSIVE
=========================== */
@media (max-width: 900px) {
  #hero {
    flex-direction: column;
    gap: 48px;
    padding-top: calc(var(--nav-h) + 48px);
  }
  .hero-visual { max-width: 100%; width: 100%; }

  .about-grid { grid-template-columns: 1fr; gap: 40px; }

  .project-card.featured {
    flex-direction: column;
    grid-column: auto;
  }
  .project-card.featured .project-top { display: flex; }
  .project-card.featured .project-body { flex: unset; }

  .cv-layout { grid-template-columns: 1fr; gap: 0; }
}

@media (max-width: 640px) {
  .nav-links { display: none; flex-direction: column; position: absolute; top: var(--nav-h); left: 0; right: 0; background: var(--bg); border-bottom: 1px solid var(--border); padding: 16px 24px; gap: 16px; }
  .nav-links.open { display: flex; }
  .nav-toggle { display: flex; }

  .skills-grid { grid-template-columns: 1fr 1fr; }
  .cv-item-header { flex-direction: column; gap: 4px; }
  .hero-cta { flex-direction: column; }
  .contact-card { width: 100%; justify-content: center; }
}