/* ===== VARIABLES ===== */
:root {
  --bg: #090d13;
  --surface: #0f1520;
  --surface-2: #151d2e;
  --surface-3: #1a2336;
  --border: #1e2d45;
  --border-light: #243350;
  --text: #e8edf5;
  --text-secondary: #8b9ab8;
  --text-muted: #5a6b8a;
  --accent: #4f9cf9;
  --accent-2: #a78bfa;
  --accent-glow: rgba(79, 156, 249, 0.15);
  --green: #34d399;
  --amber: #fbbf24;
  --radius: 12px;
  --radius-lg: 20px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 12px 48px rgba(0, 0, 0, 0.5);
  --transition: 0.25s ease;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

/* ===== RESET ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { display: block; max-width: 100%; }
button { font-family: var(--font); cursor: pointer; border: none; background: none; }

/* ===== LAYOUT ===== */
.container {
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 100px 0;
}

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

.section-label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 10px;
}

.section-title {
  font-size: clamp(1.9rem, 3.5vw, 2.7rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text);
  margin-bottom: 56px;
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-top: -36px;
  margin-bottom: 48px;
  line-height: 1.8;
}

/* ===== NAV ===== */
.nav-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  transition: background var(--transition), box-shadow var(--transition);
}

.nav-header.scrolled {
  background: rgba(9, 13, 19, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 1px 0 var(--border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.nav-logo {
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  color: var(--text);
}

.nav-logo span {
  color: var(--accent);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-links a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 6px 14px;
  border-radius: 8px;
  transition: color var(--transition), background var(--transition);
}

.nav-links a:hover {
  color: var(--text);
  background: var(--surface-2);
}

.nav-links .nav-cta {
  color: var(--accent);
  border: 1px solid var(--border-light);
  padding: 6px 16px;
}

.nav-links .nav-cta:hover {
  background: var(--accent-glow);
  color: var(--accent);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 6px;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ===== HERO ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 120px 0 80px;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 70% 50% at 50% -10%, rgba(79, 156, 249, 0.12) 0%, transparent 70%),
    radial-gradient(ellipse 50% 40% at 80% 60%, rgba(167, 139, 250, 0.07) 0%, transparent 60%);
  pointer-events: none;
}

.hero-inner {
  position: relative;
  max-width: 720px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--green);
  background: rgba(52, 211, 153, 0.1);
  border: 1px solid rgba(52, 211, 153, 0.25);
  border-radius: 100px;
  padding: 5px 14px;
  margin-bottom: 28px;
}

.hero-badge::before {
  content: '';
  display: block;
  width: 7px;
  height: 7px;
  background: var(--green);
  border-radius: 50%;
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.7); }
}

.hero-name {
  font-size: clamp(2.8rem, 6vw, 5rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1.05;
  margin-bottom: 20px;
  color: var(--text);
}

.hero-title {
  font-size: clamp(1.1rem, 2vw, 1.35rem);
  font-weight: 500;
  color: var(--accent);
  margin-bottom: 24px;
  min-height: 1.8em;
}

.cursor {
  animation: blink 1s step-end infinite;
  color: var(--accent);
}

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

.hero-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 580px;
  margin-bottom: 36px;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 44px;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  font-size: 0.95rem;
  padding: 12px 28px;
  border-radius: 10px;
  transition: opacity var(--transition), transform var(--transition);
}

.btn-primary:hover {
  opacity: 0.88;
  transform: translateY(-1px);
}

.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 12px 28px;
  border-radius: 10px;
  border: 1px solid var(--border-light);
  transition: color var(--transition), background var(--transition), transform var(--transition);
}

.btn-ghost:hover {
  color: var(--text);
  background: var(--surface-2);
  transform: translateY(-1px);
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.hero-meta span {
  display: flex;
  align-items: center;
  gap: 6px;
}

.hero-meta svg {
  color: var(--text-muted);
  flex-shrink: 0;
}

/* ===== ABOUT ===== */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 64px;
  align-items: start;
}

.about-text p {
  font-size: 1.02rem;
  color: var(--text-secondary);
  margin-bottom: 20px;
  line-height: 1.85;
}

.about-text p:last-child { margin-bottom: 0; }

.about-text strong {
  color: var(--text);
  font-weight: 600;
}

.about-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.stat-card {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 20px;
  text-align: center;
  transition: border-color var(--transition), transform var(--transition);
}

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

.stat-num {
  display: block;
  font-size: 2.2rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 6px;
}

.stat-label {
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* ===== SKILLS ===== */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
}

.skills-group {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: border-color var(--transition);
}

.skills-group:hover {
  border-color: var(--border-light);
}

.skills-group-title {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.skills-group-icon {
  font-style: normal;
  font-size: 1rem;
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag {
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--surface-3);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 5px 12px;
  transition: color var(--transition), border-color var(--transition), background var(--transition);
}

.tag:hover {
  color: var(--accent);
  border-color: rgba(79, 156, 249, 0.4);
  background: rgba(79, 156, 249, 0.06);
}

/* ===== TIMELINE ===== */
.timeline {
  position: relative;
  padding-left: 28px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(to bottom, var(--accent), var(--accent-2), transparent);
  opacity: 0.3;
}

.timeline-item {
  position: relative;
  margin-bottom: 52px;
}

.timeline-item:last-child {
  margin-bottom: 0;
}

.timeline-dot {
  position: absolute;
  left: -28px;
  top: 8px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--bg);
  border: 2.5px solid var(--accent);
  transition: background var(--transition);
  z-index: 1;
}

.timeline-item:hover .timeline-dot {
  background: var(--accent);
}

.timeline-content {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px 32px;
  transition: border-color var(--transition), transform var(--transition);
}

.timeline-item:hover .timeline-content {
  border-color: var(--border-light);
  transform: translateY(-2px);
}

.timeline-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.timeline-role {
  font-size: 1.08rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 4px;
}

.timeline-company {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--accent);
}

.timeline-period {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-muted);
  white-space: nowrap;
  background: var(--surface-3);
  border: 1px solid var(--border);
  padding: 4px 12px;
  border-radius: 100px;
  flex-shrink: 0;
}

.timeline-bullets {
  margin-bottom: 16px;
  padding-left: 0;
}

.timeline-bullets li {
  font-size: 0.93rem;
  color: var(--text-secondary);
  padding-left: 20px;
  position: relative;
  margin-bottom: 8px;
  line-height: 1.7;
}

.timeline-bullets li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-size: 0.75rem;
  top: 3px;
}

.timeline-bullets strong {
  color: var(--text);
  font-weight: 600;
}

.timeline-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.tag-sm {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-muted);
  background: var(--surface-3);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 3px 10px;
}

/* ===== PROJECTS ===== */
.project-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 40px;
  margin-top: -32px;
}

.filter-btn {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 7px 18px;
  border-radius: 100px;
  border: 1px solid var(--border);
  background: transparent;
  transition: all var(--transition);
}

.filter-btn:hover {
  color: var(--text);
  border-color: var(--border-light);
}

.filter-btn.active {
  background: var(--accent);
  color: #fff;
  border-color: transparent;
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 20px;
}

.project-card {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}

.project-card:hover {
  border-color: rgba(79, 156, 249, 0.35);
  transform: translateY(-3px);
  box-shadow: 0 8px 32px rgba(79, 156, 249, 0.08);
}

.project-card.hidden {
  display: none;
}

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

.project-emoji {
  font-size: 1.8rem;
  line-height: 1;
}

.badge {
  font-size: 0.72rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 100px;
  letter-spacing: 0.03em;
}

.badge-prod {
  background: rgba(52, 211, 153, 0.1);
  color: var(--green);
  border: 1px solid rgba(52, 211, 153, 0.25);
}

.badge-personal {
  background: rgba(167, 139, 250, 0.1);
  color: var(--accent-2);
  border: 1px solid rgba(167, 139, 250, 0.25);
}

.project-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text);
  line-height: 1.3;
}

.project-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.75;
  flex: 1;
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: auto;
}

.project-tech span {
  font-size: 0.74rem;
  font-weight: 500;
  color: var(--text-muted);
  background: var(--surface-3);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 3px 9px;
}

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

.contact-container .section-title,
.contact-container .section-label {
  text-align: center;
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
  text-align: left;
}

.contact-card {
  display: flex;
  align-items: center;
  gap: 16px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: border-color var(--transition), transform var(--transition);
  cursor: pointer;
}

.contact-card:not(.no-link):hover {
  border-color: rgba(79, 156, 249, 0.4);
  transform: translateY(-2px);
}

.contact-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: var(--accent-glow);
  border: 1px solid rgba(79, 156, 249, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  flex-shrink: 0;
}

.contact-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 4px;
}

.contact-value {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text);
}

.contact-arrow {
  margin-left: auto;
  color: var(--text-muted);
  flex-shrink: 0;
  transition: color var(--transition), transform var(--transition);
}

.contact-card:hover .contact-arrow {
  color: var(--accent);
  transform: translateX(3px);
}

/* ===== EDUCATION STRIP ===== */
.edu-strip {
  background: var(--surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 28px 0;
}

.edu-inner {
  display: flex;
  align-items: center;
  gap: 20px;
}

.edu-icon {
  font-size: 1.8rem;
  flex-shrink: 0;
}

.edu-degree {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 4px;
}

.edu-school {
  font-size: 0.87rem;
  color: var(--text-muted);
}

/* ===== FOOTER ===== */
.footer {
  background: var(--bg);
  border-top: 1px solid var(--border);
  padding: 28px 0;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-logo {
  font-size: 1.2rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  color: var(--text-muted);
}

.footer-logo span { color: var(--accent); }

.footer p {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.footer-nav {
  display: flex;
  gap: 20px;
}

.footer-nav a {
  font-size: 0.85rem;
  color: var(--text-muted);
  transition: color var(--transition);
}

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

/* ===== REVEAL ANIMATIONS ===== */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.visible {
  opacity: 1;
  transform: none;
}

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border-light); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* ===== RESPONSIVE ===== */
@media (max-width: 900px) {
  .about-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .about-stats {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (max-width: 768px) {
  .section { padding: 72px 0; }

  .nav-links {
    position: fixed;
    top: 68px;
    left: 0;
    right: 0;
    background: rgba(9, 13, 19, 0.97);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 24px;
    gap: 6px;
    border-bottom: 1px solid var(--border);
    transform: translateY(-20px);
    opacity: 0;
    pointer-events: none;
    transition: transform var(--transition), opacity var(--transition);
  }

  .nav-links.open {
    transform: none;
    opacity: 1;
    pointer-events: all;
  }

  .nav-links a {
    padding: 12px 16px;
    width: 100%;
    text-align: left;
  }

  .nav-toggle { display: flex; }

  .hero-name { font-size: clamp(2.2rem, 8vw, 3.5rem); }

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

  .timeline { padding-left: 20px; }
  .timeline-dot { left: -20px; }

  .timeline-content { padding: 20px; }

  .timeline-header {
    flex-direction: column;
    gap: 10px;
  }

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

  .footer-inner {
    flex-direction: column;
    text-align: center;
    gap: 12px;
  }

  .footer-nav { justify-content: center; }
}

@media (max-width: 480px) {
  .hero-actions { flex-direction: column; }
  .btn-primary, .btn-ghost { justify-content: center; }
  .about-stats { grid-template-columns: repeat(2, 1fr); }
  .skills-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
}

.project-link {
  display: inline-block;
  margin-top: 14px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--accent);
  text-decoration: none;
  letter-spacing: 0.02em;
  transition: opacity 0.2s;
}
.project-link:hover { opacity: 0.7; }