:root {
  --primary-color: #060a12;
  --secondary-color: #3f7dff;
  --accent-color: #7aa7ff;
  --bg-color: #070b13;
  --surface-color: rgba(12, 18, 32, 0.86);
  --surface-color-strong: rgba(14, 23, 42, 0.96);
  --border-color: rgba(122, 167, 255, 0.22);
  --text-color: #f8fbff;
  --muted-color: #aab4c5;
  --success-color: #50e3c2;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  min-height: 100vh;
  font-family: 'Roboto', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  color: var(--text-color);
  background:
    radial-gradient(circle at 20% 0%, rgba(63, 125, 255, 0.22), transparent 30%),
    radial-gradient(circle at 85% 15%, rgba(80, 227, 194, 0.08), transparent 26%),
    linear-gradient(180deg, #070b13 0%, #090d17 48%, #05070d 100%);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(122, 167, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(122, 167, 255, 0.035) 1px, transparent 1px);
  background-size: 42px 42px;
  mask-image: linear-gradient(to bottom, rgba(0,0,0,.75), transparent 80%);
  z-index: -1;
}

/*MARK:Navbar*/
.navbar {
  position: sticky;
  top: 0;
  z-index: 50;
  min-height: 68px;
  background: rgba(6, 10, 18, 0.88);
  border-bottom: 1px solid var(--border-color);
  backdrop-filter: blur(14px);
}

.navbar-brand {
  display: inline-flex;
  align-items: center;
  gap: .75rem;
  color: var(--text-color);
  font-weight: 800;
  letter-spacing: .06em;
  text-transform: uppercase;
}

.home-icon {
  fill: white;
  width: 26px;
  height: 26px;
  transition: fill 0.3s ease, filter .3s ease;
}

.home-icon:hover { fill: var(--accent-color); filter: drop-shadow(0 0 8px rgba(63,125,255,.8)); }

.navbar-contacts { margin-left: 24px; }
.navbar-contacts .contact-icon { font-size: 1.15rem; margin-right: 0; }
.navbar-contacts .contact-link { padding: 5px; display: inline-flex; align-items: center; position: relative; top: 2px; }

.nav-link-custom {
  color: var(--muted-color);
  text-decoration: none;
  font-size: .82rem;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
  transition: color .2s ease;
}
.nav-link-custom:hover { color: var(--accent-color); }

.language-selector .btn {
  border-color: var(--border-color);
  color: var(--text-color);
  background: rgba(255,255,255,.04);
}
.language-selector .btn:hover { background: var(--secondary-color); border-color: var(--secondary-color); }

/*MARK:Hero*/
.header-section {
  position: relative;
  overflow: hidden;
  min-height: 640px;
  padding: 104px 0 84px;
  color: white;
  background:
    linear-gradient(90deg, rgba(5,8,15,.96) 0%, rgba(5,8,15,.84) 42%, rgba(5,8,15,.48) 100%),
    url('../img/hero-portfolio-concept.png') center top / cover no-repeat;
  border-bottom: 1px solid var(--border-color);
}

.header-section::after {
  content: "";
  position: absolute;
  inset: auto 0 0;
  height: 180px;
  background: linear-gradient(180deg, transparent, var(--bg-color));
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 760px;
}

.hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: .55rem;
  margin-bottom: 18px;
  color: var(--accent-color);
  font-weight: 800;
  letter-spacing: .12em;
  text-transform: uppercase;
}

.hero-kicker::before {
  content: ">_";
  color: var(--accent-color);
  text-shadow: 0 0 16px rgba(63,125,255,.9);
}

.header-section h1 {
  max-width: 700px;
  margin: 0;
  font-size: clamp(3rem, 8vw, 6.8rem);
  line-height: .88;
  letter-spacing: .02em;
  text-transform: uppercase;
  text-shadow: 0 0 28px rgba(0,0,0,.7);
}

.header-section h1 span { color: var(--secondary-color); display: block; }
.header-subtitle { margin-top: 24px; color: #dbe7ff; font-size: clamp(1.1rem, 2vw, 1.5rem); line-height: 1.6; }

.hero-actions { display: flex; flex-wrap: wrap; gap: 16px; margin-top: 34px; }
.btn-hero {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 50px;
  padding: 0 24px;
  border-radius: 8px;
  font-weight: 800;
  letter-spacing: .04em;
  text-decoration: none;
  text-transform: uppercase;
  transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
}
.btn-hero-primary { color: white; background: linear-gradient(135deg, #2f62ff, #5c8dff); box-shadow: 0 0 28px rgba(63,125,255,.38); }
.btn-hero-secondary { color: white; border: 1px solid var(--border-color); background: rgba(7, 11, 19, .55); }
.btn-hero:hover { color: white; transform: translateY(-2px); box-shadow: 0 0 35px rgba(63,125,255,.44); }

.hero-stats {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0;
  margin-top: -52px;
  padding: 22px 0;
  background: rgba(8, 13, 24, .88);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  backdrop-filter: blur(14px);
  box-shadow: 0 20px 60px rgba(0,0,0,.35);
}
.stat-item { display: flex; align-items: center; gap: 14px; padding: 10px 28px; border-right: 1px solid var(--border-color); }
.stat-item:last-child { border-right: 0; }
.stat-item i { color: var(--secondary-color); font-size: 2rem; }
.stat-value { display: block; font-size: 1.35rem; font-weight: 900; }
.stat-label { display: block; color: var(--muted-color); font-size: .82rem; line-height: 1.25; text-transform: uppercase; }

/*MARK:Sections*/
main.container { position: relative; z-index: 3; }
.profile-content {
  background: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  box-shadow: 0 20px 55px rgba(0, 0, 0, 0.24);
  padding: 34px;
  margin-top: 34px;
  backdrop-filter: blur(10px);
}
.profile-content:first-child { margin-top: 34px; }

.section-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 28px;
}
.section-title h3, .profile-content h3 {
  margin-bottom: 0;
  color: var(--text-color);
  font-weight: 900;
  letter-spacing: .04em;
  text-transform: uppercase;
}
.section-title h3::before, .profile-content > h3::before {
  content: "";
  display: inline-block;
  width: 30px;
  height: 2px;
  margin-right: 12px;
  vertical-align: middle;
  background: var(--secondary-color);
  box-shadow: 0 0 16px rgba(63,125,255,.7);
}

.introduction-text { font-size: 1.05rem; line-height: 1.75; color: #d6deec; margin: 0; }
.introduction-text strong { color: white; }

/*MARK:Projects*/
.project-card {
  height: 100%;
  overflow: hidden;
  color: var(--text-color);
  background: linear-gradient(180deg, rgba(15,24,42,.95), rgba(8,13,24,.98));
  border: 1px solid var(--border-color);
  border-radius: 14px;
  box-shadow: 0 18px 45px rgba(0, 0, 0, 0.28);
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
  cursor: pointer;
}
.project-card:hover { transform: translateY(-8px); border-color: rgba(122,167,255,.62); box-shadow: 0 22px 60px rgba(0,0,0,.42), 0 0 28px rgba(63,125,255,.18); }
.project-card:hover .card-title { color: var(--accent-color); }
.project-hidden { display: none; }
.project-card img { height: 235px; width: 100%; object-fit: cover; filter: saturate(1.08) contrast(1.04); }
.project-card .card-body { padding: 22px; }
.project-card .card-title { margin-bottom: 6px; font-size: 1.45rem; font-weight: 900; letter-spacing: .04em; text-transform: uppercase; transition: color .25s ease; }
.project-card .card-text { color: #d6deec; line-height: 1.55; }
.project-label { display: inline-block; position: absolute; top: 18px; left: 18px; z-index: 2; padding: 6px 10px; border-radius: 4px; background: var(--secondary-color); color: white; font-size: .75rem; font-weight: 900; letter-spacing: .06em; text-transform: uppercase; }
.project-media { position: relative; }
.play-icon { position: absolute; inset: 50% auto auto 50%; transform: translate(-50%, -50%); width: 58px; height: 58px; display: grid; place-items: center; border: 1px solid rgba(255,255,255,.65); border-radius: 50%; color: white; background: rgba(0,0,0,.35); backdrop-filter: blur(8px); }
.tech-stack { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 18px; }
.tech-badge { display: inline-block; padding: 6px 12px; border: 1px solid var(--border-color); border-radius: 6px; margin: 0; background: rgba(4, 7, 13, .65); color: #dbe7ff; font-size: .78rem; font-weight: 700; text-transform: uppercase; }

/*MARK:Technologies*/
.tech-grid { display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); border: 1px solid var(--border-color); border-radius: 12px; overflow: hidden; background: rgba(6,10,18,.5); }
.tech-item { min-height: 112px; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 10px; padding: 18px 12px; text-align: center; border-right: 1px solid var(--border-color); }
.tech-item:last-child { border-right: 0; }
.tech-item i { color: var(--secondary-color); font-size: 2rem; }
.tech-item span { font-size: .82rem; font-weight: 800; letter-spacing: .04em; text-transform: uppercase; }
.tech-item small { color: var(--muted-color); }

/*MARK:Experience*/
.timeline { position: relative; display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 24px; padding-top: 34px; }
.timeline::before { content: ""; position: absolute; left: 0; right: 0; top: 42px; height: 2px; background: linear-gradient(90deg, transparent, var(--secondary-color), transparent); box-shadow: 0 0 14px rgba(63,125,255,.8); }
.timeline-item { position: relative; padding-top: 34px; }
.timeline-item::before { content: ""; position: absolute; top: 1px; left: 0; width: 16px; height: 16px; border-radius: 50%; background: var(--secondary-color); box-shadow: 0 0 18px rgba(63,125,255,.9); }
.timeline-year { color: white; font-weight: 900; }
.timeline-title { margin: 8px 0; color: var(--secondary-color); font-weight: 900; text-transform: uppercase; }
.timeline-text { color: var(--muted-color); line-height: 1.55; }

.experience-card { border: 1px solid var(--border-color); border-radius: 14px; box-shadow: 0 12px 28px rgba(0,0,0,.22); margin-bottom: 18px; padding: 20px; background: rgba(8, 13, 24, .74); transition: transform .25s ease, border-color .25s ease; }
.experience-card:hover { transform: translateY(-4px); border-color: rgba(122,167,255,.56); background: rgba(12, 18, 32, .95); }
.experience-card:hover .company-name { color: var(--accent-color); font-weight: 900; }
.experience-hidden { display: none; }
.experience-header { cursor: pointer; }
.experience-period { color: var(--accent-color); font-weight: bold; white-space: nowrap; }
.experience-details { padding-top: 10px; color: #d6deec; }
.experience-job { font-weight: bold; color: white; }

/*MARK:Show More*/
.show-more-btn { display: block; min-width: 160px; margin: 24px auto 0; padding: 12px 18px; background: linear-gradient(135deg, #2f62ff, #5c8dff); color: white; border: none; border-radius: 8px; cursor: pointer; font-weight: 900; letter-spacing: .04em; text-transform: uppercase; transition: transform .2s ease, box-shadow .2s ease; }
.show-more-btn:hover { transform: translateY(-2px); box-shadow: 0 0 26px rgba(63,125,255,.38); }

/*MARK:Footer*/
footer { background: rgba(6, 10, 18, 0.92); color: white; padding: 46px 0; margin-top: 56px; border-top: 1px solid var(--border-color); }
.footer-panel { padding: 28px; border: 1px solid var(--border-color); border-radius: 16px; background: linear-gradient(135deg, rgba(15,24,42,.9), rgba(8,13,24,.9)); }
.contact-icon { font-size: 1.35rem; margin-right: 10px; color: var(--accent-color); transition: color 0.3s ease; }
.contact-icon:hover { color: white; }
.contact-link { color: white; text-decoration: none; transition: color 0.3s ease; }
.contact-link:hover { color: var(--accent-color); }
.contact-item { margin-bottom: 15px; }

/*MARK:Copy*/
.copy-feedback { position: fixed; bottom: 20px; right: 20px; background: var(--surface-color-strong); border: 1px solid var(--border-color); color: white; padding: 10px 20px; border-radius: 8px; display: none; animation: fadeInOut 2s ease-in-out; z-index: 1000; }
@keyframes fadeInOut { 0% { opacity: 0; transform: translateY(8px); } 15% { opacity: 1; transform: translateY(0); } 85% { opacity: 1; } 100% { opacity: 0; transform: translateY(8px); } }

hr { margin: 10px 0; border-color: var(--border-color); opacity: 1; }

@media (max-width: 992px) {
  .hero-stats, .tech-grid, .timeline { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .stat-item { border-right: 0; border-bottom: 1px solid var(--border-color); }
  .stat-item:nth-last-child(-n+2) { border-bottom: 0; }
  .tech-item { border-right: 0; border-bottom: 1px solid var(--border-color); }
  .timeline::before { display: none; }
}

@media (max-width: 576px) {
  .header-section { min-height: auto; padding: 74px 0 110px; }
  .hero-stats, .tech-grid, .timeline { grid-template-columns: 1fr; }
  .stat-item, .stat-item:nth-last-child(-n+2), .tech-item { border-right: 0; border-bottom: 1px solid var(--border-color); }
  .stat-item:last-child, .tech-item:last-child { border-bottom: 0; }
  .profile-content { padding: 24px 18px; }
  .hero-actions { flex-direction: column; align-items: stretch; }
  .btn-hero { justify-content: center; }
}