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

:root {
  --bg: #080b14;
  --bg-alt: #0d1120;
  --card: #1a2235;
  --border: rgba(99, 130, 255, 0.15);
  --purple: #6366f1;
  --purple-light: #818cf8;
  --teal: #10b981;
  --txt: #e2e8f0;
  --txt-dim: #94a3b8;
  --r: 12px;
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', sans-serif;
  background: var(--bg);
  color: var(--txt);
  line-height: 1.6;
  overflow-x: hidden;
}

::-webkit-scrollbar { width: 5px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--purple); border-radius: 99px; }

nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  height: 60px;
  padding: 0 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(8, 11, 20, 0.82);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
  transition: box-shadow 0.25s;
}

nav.scrolled {
  box-shadow: 0 4px 30px rgba(99, 102, 241, 0.1);
}

.nav-logo {
  font-family: 'JetBrains Mono', monospace;
  color: var(--purple-light);
  text-decoration: none;
  font-size: 0.95rem;
  letter-spacing: 0.05em;
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 2rem;
}

.nav-links a {
  color: var(--txt-dim);
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 500;
  transition: color 0.15s;
}

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

.nav-cta {
  background: var(--purple) !important;
  color: #fff !important;
  padding: 0.4rem 1rem;
  border-radius: 6px;
}

.nav-cta:hover { background: var(--purple-light) !important; }

#hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 80px 2rem 4rem;
  position: relative;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 50% at 50% 0%, rgba(99,102,241,0.18) 0%, transparent 70%),
    radial-gradient(ellipse 40% 40% at 80% 60%, rgba(16,185,129,0.08) 0%, transparent 60%);
  pointer-events: none;
}

/* фоновая сетка */
.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(99,102,241,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(99,102,241,0.04) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
}

.hero-content {
  position: relative;
  max-width: 700px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(99,102,241,0.12);
  border: 1px solid rgba(99,102,241,0.3);
  color: var(--purple-light);
  font-size: 0.8rem;
  font-weight: 500;
  padding: 0.3rem 0.9rem;
  border-radius: 999px;
  margin-bottom: 1.5rem;
}

.dot {
  width: 7px;
  height: 7px;
  background: var(--teal);
  border-radius: 50%;
  animation: blink 2s ease-in-out infinite;
}

@keyframes blink {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.75); }
}

h1 {
  font-size: clamp(2.4rem, 6vw, 4rem);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, #fff 0%, var(--purple-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-sub {
  color: var(--txt-dim);
  font-size: 1.05rem;
  max-width: 480px;
  margin: 0 auto 2rem;
}

.hero-links {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 2.5rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.6rem 1.3rem;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.88rem;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: transform 0.15s, box-shadow 0.15s, background 0.15s;
}

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

.btn-primary:hover {
  background: var(--purple-light);
  transform: translateY(-1px);
  box-shadow: 0 8px 20px rgba(99,102,241,0.35);
}

.btn-outline {
  background: transparent;
  color: var(--txt);
  border: 1px solid var(--border);
}

.btn-outline:hover {
  border-color: var(--purple-light);
  color: var(--purple-light);
  transform: translateY(-1px);
}

.hero-contacts {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 1.5rem;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--txt-dim);
  font-size: 0.84rem;
  text-decoration: none;
  transition: color 0.15s;
}

.contact-item:hover { color: var(--purple-light); }
.contact-item svg { width: 14px; height: 14px; flex-shrink: 0; }

section { padding: 5rem 2rem; }

.container {
  max-width: 900px;
  margin: 0 auto;
}

.section-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.73rem;
  color: var(--purple);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: 0.4rem;
}

.section-title {
  font-size: clamp(1.6rem, 3vw, 2.1rem);
  font-weight: 700;
  margin-bottom: 2.75rem;
}

.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}

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

#about { background: var(--bg-alt); }

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

.about-text p {
  color: var(--txt-dim);
  font-size: 0.94rem;
  margin-bottom: 1rem;
}

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

.stat-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--r);
  padding: 1.25rem;
  text-align: center;
  transition: border-color 0.18s, transform 0.18s;
}

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

.stat-num {
  font-size: 2rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--purple-light), var(--teal));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  font-size: 0.76rem;
  color: var(--txt-dim);
  margin-top: 0.25rem;
}

#experience { background: var(--bg); }

.timeline {
  position: relative;
  padding-left: 2rem;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 8px;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--purple), transparent);
}

.timeline-item {
  position: relative;
  padding: 1.5rem;
  margin-bottom: 2rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--r);
  transition: border-color 0.18s, transform 0.18s, box-shadow 0.18s;
}

.timeline-item:hover {
  border-color: var(--purple);
  transform: translateX(3px);
  box-shadow: 0 4px 28px rgba(99,102,241,0.1);
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -2.38rem;
  top: 1.75rem;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--purple);
  border: 2px solid var(--bg);
  box-shadow: 0 0 0 3px rgba(99,102,241,0.2);
}

.tl-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.4rem;
}

.tl-title { font-size: 1rem; font-weight: 700; }

.tl-company {
  font-size: 0.84rem;
  color: var(--purple-light);
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.tl-date {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.73rem;
  color: var(--txt-dim);
  background: rgba(99,102,241,0.08);
  padding: 0.2rem 0.55rem;
  border-radius: 4px;
  white-space: nowrap;
}

.badge-level {
  font-size: 0.68rem;
  font-weight: 700;
  padding: 0.15rem 0.45rem;
  border-radius: 4px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-left: 0.45rem;
  display: inline-block;
}

.badge-mid { background: rgba(16,185,129,0.15); color: var(--teal); }
.badge-jun { background: rgba(99,102,241,0.15); color: var(--purple-light); }

.tl-desc {
  color: var(--txt-dim);
  font-size: 0.87rem;
  margin-top: 0.75rem;
}

.tl-desc ul { list-style: none; }

.tl-desc li {
  padding: 0.2rem 0 0.2rem 1.2rem;
  position: relative;
}

.tl-desc li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--purple);
  font-size: 0.78rem;
}

.tl-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 1rem;
}

.tag {
  font-size: 0.7rem;
  padding: 0.18rem 0.5rem;
  background: rgba(99,102,241,0.08);
  border: 1px solid rgba(99,102,241,0.2);
  border-radius: 4px;
  color: var(--purple-light);
  font-weight: 500;
}

#skills { background: var(--bg-alt); }

.skills-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.5rem;
}

.skill-group-title {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--txt-dim);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 1rem;
}

.skill-item { margin-bottom: 1rem; }

.skill-top {
  display: flex;
  justify-content: space-between;
  margin-bottom: 0.3rem;
}

.skill-name { font-size: 0.88rem; font-weight: 500; }

.skill-pct {
  font-size: 0.78rem;
  color: var(--txt-dim);
  font-family: 'JetBrains Mono', monospace;
}

.skill-bar {
  height: 5px;
  background: rgba(255,255,255,0.05);
  border-radius: 3px;
  overflow: hidden;
}

.skill-fill {
  height: 100%;
  width: 0;
  border-radius: 3px;
  background: linear-gradient(90deg, var(--purple), var(--purple-light));
  transition: width 1.1s cubic-bezier(.4,0,.2,1);
}

.skill-fill.green {
  background: linear-gradient(90deg, var(--teal), #34d399);
}

.tools-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-top: 0.5rem;
}

.tool-chip {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.78rem;
  padding: 0.28rem 0.7rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--txt);
  transition: border-color 0.15s, color 0.15s;
}

.tool-chip:hover {
  border-color: var(--purple-light);
  color: var(--purple-light);
}

#achievements { background: var(--bg); }

.ach-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(255px, 1fr));
  gap: 1rem;
}

.ach-card {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  padding: 1.2rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--r);
  transition: border-color 0.18s, transform 0.18s, box-shadow 0.18s;
}

.ach-card:hover {
  border-color: var(--purple);
  transform: translateY(-2px);
  box-shadow: 0 6px 22px rgba(99,102,241,0.1);
}

.ach-icon { font-size: 1.4rem; flex-shrink: 0; }
.ach-text h4 { font-size: 0.88rem; font-weight: 600; margin-bottom: 0.2rem; }
.ach-text p { font-size: 0.78rem; color: var(--txt-dim); }

#courses { background: var(--bg-alt); }

.courses-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(275px, 1fr));
  gap: 0.9rem;
}

.course-card {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.2rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--r);
  transition: border-color 0.18s, transform 0.18s;
}

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

.course-icon {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  flex-shrink: 0;
}

.course-icon.react { background: rgba(97,218,251,0.1); }
.course-icon.js    { background: rgba(247,223,30,0.1); }
.course-icon.ts    { background: rgba(49,120,198,0.1); }
.course-icon.algo  { background: rgba(99,102,241,0.1); }
.course-icon.db    { background: rgba(16,185,129,0.1); }

.course-info h4 { font-size: 0.86rem; font-weight: 600; margin-bottom: 0.1rem; }
.course-info p  { font-size: 0.74rem; color: var(--txt-dim); }

#projects { background: var(--bg); }

.project-card {
  display: flex;
  gap: 1.5rem;
  align-items: flex-start;
  padding: 1.75rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--r);
  transition: border-color 0.18s, transform 0.18s, box-shadow 0.18s;
}

.project-card:hover {
  border-color: var(--purple);
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(99,102,241,0.11);
}

.project-icon { font-size: 2rem; flex-shrink: 0; }
.project-body h3 { font-size: 1rem; font-weight: 700; margin-bottom: 0.4rem; }
.project-body p { color: var(--txt-dim); font-size: 0.86rem; margin-bottom: 1rem; }

footer {
  background: var(--bg-alt);
  border-top: 1px solid var(--border);
  padding: 2.5rem 2rem;
  text-align: center;
}

footer p { color: var(--txt-dim); font-size: 0.82rem; }
footer p + p { margin-top: 0.4rem; }
footer a { color: var(--purple-light); text-decoration: none; }

@media (max-width: 680px) {
  nav { padding: 0 1rem; }
  .nav-links { display: none; }
  .about-grid,
  .skills-grid { grid-template-columns: 1fr; }
  .project-card { flex-direction: column; }
}