/* ─── Google Fonts ─────────────────────────────────────────────────────────── */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=JetBrains+Mono:wght@400;500&display=swap');

/* ─── CSS Variables ─────────────────────────────────────────────────────────── */
:root {
  --bg-primary:    #050b18;
  --bg-secondary:  #0a1628;
  --bg-card:       #0f1f3d;
  --bg-card-hover: #152540;
  --accent:        #00b4ff;
  --accent-2:      #7c3aed;
  --accent-glow:   rgba(0,180,255,0.18);
  --text-primary:  #e8edf5;
  --text-secondary:#8899bb;
  --text-muted:    #4a5e80;
  --border:        rgba(0,180,255,0.12);
  --border-hover:  rgba(0,180,255,0.4);
  --radius:        12px;
  --radius-lg:     20px;
  --shadow:        0 4px 24px rgba(0,0,0,0.4);
  --shadow-accent: 0 0 32px rgba(0,180,255,0.15);
  --transition:    0.3s cubic-bezier(0.4,0,0.2,1);
}

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

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

body {
  font-family: 'Inter', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

/* ─── Scrollbar ─────────────────────────────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: var(--accent); border-radius: 3px; }

/* ─── Utilities ─────────────────────────────────────────────────────────────── */
.container { max-width: 1160px; margin: 0 auto; padding: 0 24px; }
.section { padding: 100px 0; }
.section-title {
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 800;
  text-align: center;
  margin-bottom: 64px;
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ─── Animations ────────────────────────────────────────────────────────────── */
.fade-up {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.7s var(--transition), transform 0.7s var(--transition);
}
.fade-up.visible { opacity: 1; transform: translateY(0); }

.fade-in {
  opacity: 0;
  transition: opacity 0.6s ease;
}
.fade-in.visible { opacity: 1; }

/* ─── NAV ───────────────────────────────────────────────────────────────────── */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 16px 0;
  transition: background var(--transition), box-shadow var(--transition), padding var(--transition);
}
.nav.scrolled {
  background: rgba(5,11,24,0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 1px 0 var(--border);
  padding: 10px 0;
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.nav__logo {
  font-weight: 800;
  font-size: 1.1rem;
  letter-spacing: -0.02em;
  color: var(--accent);
  white-space: nowrap;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}
.nav__links a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition);
  position: relative;
  padding-bottom: 2px;
}
.nav__links a::after {
  content: '';
  position: absolute;
  bottom: -2px; left: 0;
  width: 0; height: 2px;
  background: var(--accent);
  transition: width var(--transition);
  border-radius: 2px;
}
.nav__links a:hover { color: var(--text-primary); }
.nav__links a:hover::after { width: 100%; }

.nav__right { display: flex; align-items: center; gap: 16px; }

.lang-toggle {
  display: flex;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}
.lang-btn {
  padding: 5px 12px;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  background: transparent;
  color: var(--text-muted);
  transition: all var(--transition);
  font-family: 'Inter', sans-serif;
}
.lang-btn.active {
  background: var(--accent);
  color: #000;
}

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

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

.hero__bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 50% at 50% -10%, rgba(0,180,255,0.15), transparent),
    radial-gradient(ellipse 60% 40% at 80% 60%, rgba(124,58,237,0.1), transparent);
  pointer-events: none;
}

.hero__grid-bg {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0,180,255,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,180,255,0.04) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
}

.hero__content {
  position: relative;
  z-index: 2;
  max-width: 760px;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(0,180,255,0.08);
  border: 1px solid rgba(0,180,255,0.2);
  border-radius: 999px;
  padding: 6px 16px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 28px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
.hero__badge::before {
  content: '';
  width: 8px; height: 8px;
  background: var(--accent);
  border-radius: 50%;
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.8); }
}

.hero__name {
  font-size: clamp(2.4rem, 6vw, 4.2rem);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -0.03em;
  margin-bottom: 16px;
  color: var(--text-primary);
}
.hero__name span {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__tagline {
  font-size: clamp(1.1rem, 2.5vw, 1.5rem);
  color: var(--text-secondary);
  margin-bottom: 48px;
  font-weight: 400;
  line-height: 1.5;
}

.hero__actions { display: flex; gap: 16px; flex-wrap: wrap; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.95rem;
  transition: all var(--transition);
  cursor: pointer;
  font-family: 'Inter', sans-serif;
  border: none;
}
.btn-primary {
  background: var(--accent);
  color: #000;
  box-shadow: 0 0 24px rgba(0,180,255,0.3);
}
.btn-primary:hover {
  background: #33c3ff;
  box-shadow: 0 0 40px rgba(0,180,255,0.5);
  transform: translateY(-2px);
}
.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-hover);
}
.btn-outline:hover {
  background: rgba(0,180,255,0.08);
  border-color: var(--accent);
  transform: translateY(-2px);
}

.hero__stats {
  margin-top: 72px;
  display: flex;
  gap: 48px;
  flex-wrap: wrap;
}
.hero__stat-value {
  font-size: 2rem;
  font-weight: 800;
  color: var(--accent);
  font-family: 'JetBrains Mono', monospace;
}
.hero__stat-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-top: 2px;
}

/* ─── ABOUT ─────────────────────────────────────────────────────────────────── */
.about { background: var(--bg-secondary); }

.about__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

.about__avatar {
  position: relative;
  display: flex;
  justify-content: center;
}

.about__avatar-placeholder {
  width: 300px;
  height: 300px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--bg-card) 0%, var(--bg-card-hover) 100%);
  border: 3px solid rgba(0,180,255,0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 5rem;
  box-shadow: 0 0 60px rgba(0,180,255,0.15);
  position: relative;
  z-index: 1;
}

.about__avatar-ring {
  position: absolute;
  inset: -16px;
  border-radius: 50%;
  border: 1px dashed rgba(0,180,255,0.3);
  animation: spin 20s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.about__text p {
  color: var(--text-secondary);
  margin-bottom: 20px;
  font-size: 1.05rem;
}

.about__value {
  background: rgba(0,180,255,0.06);
  border-left: 3px solid var(--accent);
  padding: 16px 20px;
  border-radius: 0 var(--radius) var(--radius) 0;
  font-style: italic;
  color: var(--text-primary);
  margin: 28px 0;
}

.about__stats {
  display: flex;
  gap: 32px;
  flex-wrap: wrap;
  margin-top: 32px;
}
.about__stat {
  text-align: center;
}
.about__stat-value {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--accent);
  font-family: 'JetBrains Mono', monospace;
}
.about__stat-label {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 2px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ─── SKILLS ────────────────────────────────────────────────────────────────── */
.skills__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
}

.skill-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: all var(--transition);
}
.skill-card:hover {
  border-color: var(--border-hover);
  box-shadow: var(--shadow-accent);
  transform: translateY(-4px);
}

.skill-card__icon {
  font-size: 2.4rem;
  margin-bottom: 16px;
}
.skill-card__name {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.skill-tag {
  background: rgba(0,180,255,0.08);
  border: 1px solid rgba(0,180,255,0.15);
  color: var(--accent);
  padding: 4px 12px;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 500;
  font-family: 'JetBrains Mono', monospace;
  transition: all var(--transition);
}
.skill-tag:hover {
  background: rgba(0,180,255,0.16);
  border-color: var(--accent);
}

/* ─── SERVICES ──────────────────────────────────────────────────────────────── */
.services { background: var(--bg-secondary); }

.services__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

.service-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}
.service-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(0,180,255,0.04), transparent);
  opacity: 0;
  transition: opacity var(--transition);
}
.service-card:hover { border-color: var(--border-hover); transform: translateY(-6px); }
.service-card:hover::before { opacity: 1; }
.service-card:hover .service-card__icon { transform: scale(1.1); }

.service-card__icon {
  font-size: 2.8rem;
  margin-bottom: 20px;
  display: inline-block;
  transition: transform var(--transition);
}
.service-card__title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-primary);
}
.service-card__desc {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.65;
}

/* ─── PROJECTS ──────────────────────────────────────────────────────────────── */
.projects__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 28px;
}

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 36px;
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
}
.project-card:hover {
  border-color: var(--border-hover);
  box-shadow: var(--shadow-accent);
  transform: translateY(-4px);
}

.project-card__num {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 12px;
  font-family: 'JetBrains Mono', monospace;
}
.project-card__title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 14px;
  color: var(--text-primary);
  line-height: 1.4;
}
.project-card__desc {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.65;
  flex: 1;
  margin-bottom: 20px;
}
.project-card__tech {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}
.project-card__result {
  background: rgba(0,180,255,0.06);
  border: 1px solid rgba(0,180,255,0.15);
  border-radius: var(--radius);
  padding: 12px 16px;
  font-size: 0.88rem;
  color: var(--accent);
  font-weight: 500;
}
.project-card__result::before {
  content: '→ ';
  font-weight: 700;
}

/* ─── CONTACT ───────────────────────────────────────────────────────────────── */
.contact { background: var(--bg-secondary); }

.contact__layout {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 64px;
  align-items: start;
}

.contact__info h3 {
  font-size: 1.8rem;
  font-weight: 800;
  margin-bottom: 16px;
  line-height: 1.3;
}
.contact__info p {
  color: var(--text-secondary);
  margin-bottom: 32px;
}

.contact__links {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.contact__link {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--text-secondary);
  font-size: 0.95rem;
  transition: color var(--transition);
}
.contact__link:hover { color: var(--accent); }
.contact__link-icon {
  width: 40px;
  height: 40px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
  transition: all var(--transition);
}
.contact__link:hover .contact__link-icon {
  border-color: var(--accent);
  background: rgba(0,180,255,0.08);
}

.contact__form {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 40px;
}

.form-group { margin-bottom: 20px; }
.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.form-group input,
.form-group textarea {
  width: 100%;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 13px 16px;
  color: var(--text-primary);
  font-size: 0.95rem;
  font-family: 'Inter', sans-serif;
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
  resize: vertical;
}
.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(0,180,255,0.1);
}
.form-group textarea { min-height: 120px; }

/* ─── FOOTER ────────────────────────────────────────────────────────────────── */
.footer {
  padding: 32px 0;
  border-top: 1px solid var(--border);
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
}
.footer span { color: var(--accent); }

/* ─── MOBILE NAV ────────────────────────────────────────────────────────────── */
@media (max-width: 768px) {
  .nav__hamburger { display: flex; }
  .nav__links {
    display: none;
    position: fixed;
    top: 64px; left: 0; right: 0;
    background: rgba(5,11,24,0.97);
    backdrop-filter: blur(20px);
    flex-direction: column;
    gap: 0;
    padding: 16px 0;
    border-bottom: 1px solid var(--border);
  }
  .nav__links.open { display: flex; }
  .nav__links li { width: 100%; }
  .nav__links a {
    display: block;
    padding: 14px 24px;
    font-size: 1rem;
  }
  .nav__links a::after { display: none; }

  .about__grid,
  .contact__layout { grid-template-columns: 1fr; }
  .about__avatar { display: none; }
  .projects__grid { grid-template-columns: 1fr; }
  .hero__stats { gap: 24px; }
  .contact__form { padding: 24px; }
}

@media (max-width: 480px) {
  .section { padding: 72px 0; }
  .hero { padding: 100px 0 60px; }
  .hero__actions { flex-direction: column; }
  .btn { width: 100%; justify-content: center; }
}