/* ===== Tokens ===== */
:root {
  --bg:        #0a0e17;
  --bg-soft:   #0f1422;
  --surface:   rgba(255, 255, 255, 0.03);
  --surface-2: rgba(255, 255, 255, 0.05);
  --border:    rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.16);

  --text:      #e6ecf5;
  --text-dim:  #9aa6bd;
  --text-mute: #5e6b85;

  --accent:    #64ffda;
  --accent-2:  #7c8bff;
  --accent-glow: rgba(100, 255, 218, 0.35);

  --radius:    16px;
  --radius-sm: 10px;
  --maxw:      1080px;

  --font: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

/* ===== Base ===== */
*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

.mono { font-family: var(--mono); }

a { color: inherit; text-decoration: none; }

h1, h2, h3 { margin: 0; line-height: 1.15; letter-spacing: -0.02em; }

::selection { background: var(--accent); color: #04140f; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ===== Scroll progress ===== */
.scroll-progress {
  position: fixed;
  top: 0; left: 0;
  height: 3px;
  width: 0;
  z-index: 50;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  box-shadow: 0 0 12px var(--accent-glow);
  transition: width 0.05s linear;
}

/* ===== Decorative background ===== */
.bg-grid {
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    linear-gradient(var(--bg), var(--bg-soft) 60%, var(--bg)),
    linear-gradient(rgba(124, 139, 255, 0.06) 1px, transparent 1px) 0 0 / 100% 56px,
    linear-gradient(90deg, rgba(124, 139, 255, 0.06) 1px, transparent 1px) 0 0 / 56px 100%;
  mask-image: radial-gradient(ellipse 90% 70% at 50% 0%, #000 35%, transparent 100%);
}
.bg-glow {
  position: fixed;
  z-index: -1;
  width: 50vw;
  height: 50vw;
  max-width: 640px;
  max-height: 640px;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.25;
  pointer-events: none;
  will-change: transform;
  transition: transform 0.4s cubic-bezier(0.2, 0.8, 0.2, 1);
}
.bg-glow--1 { top: -10%; left: -8%; background: var(--accent); }
.bg-glow--2 { top: 30%; right: -12%; background: var(--accent-2); opacity: 0.2; }
.bg-glow--3 { bottom: -15%; left: 25%; background: #ff7cc4; opacity: 0.12; }

/* ===== Header ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: 24px;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 18px 24px;
  background: linear-gradient(var(--bg), rgba(10, 14, 23, 0.6));
  backdrop-filter: blur(10px);
  border-bottom: 1px solid transparent;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; }
.brand__mark { font-family: var(--mono); color: var(--accent); font-size: 1.1rem; }
.brand__name { letter-spacing: -0.01em; }

.nav {
  display: flex;
  gap: 22px;
  margin-left: auto;
  font-size: 0.92rem;
  color: var(--text-dim);
}
.nav a { position: relative; transition: color 0.2s; }
.nav a:hover { color: var(--text); }
.nav a.is-active { color: var(--text); }
.nav a::after {
  content: "";
  position: absolute;
  left: 0; bottom: -5px;
  width: 0; height: 1.5px;
  background: var(--accent);
  transition: width 0.25s;
}
.nav a:hover::after,
.nav a.is-active::after { width: 100%; }

.lang-switch {
  display: flex;
  align-items: center;
  gap: 4px;
  font-family: var(--mono);
  font-size: 0.82rem;
  padding: 5px 10px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
}
.lang-switch__btn {
  background: none; border: none;
  color: var(--text-mute);
  cursor: pointer;
  font: inherit;
  padding: 1px 3px;
  transition: color 0.2s;
}
.lang-switch__btn:hover { color: var(--text-dim); }
.lang-switch__btn.is-active { color: var(--accent); font-weight: 700; }
.lang-switch__sep { color: var(--text-mute); }

/* ===== Layout ===== */
main { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

.section { padding: 84px 0; border-top: 1px solid var(--border); }
.section__title {
  display: flex;
  align-items: baseline;
  gap: 14px;
  font-size: clamp(1.5rem, 3vw, 2rem);
  margin-bottom: 36px;
}
.section__num { color: var(--accent); font-size: 0.95rem; font-weight: 700; }

/* ===== Pills (hero badges) ===== */
.hero__badges { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 24px; }
.pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  letter-spacing: 0.03em;
  padding: 6px 14px;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  background: var(--surface);
}
.pill--role { color: var(--accent); }
.pill--status { color: var(--text-dim); }
.status-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 0 var(--accent-glow);
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0%   { box-shadow: 0 0 0 0 rgba(100,255,218,0.5); }
  70%  { box-shadow: 0 0 0 8px rgba(100,255,218,0); }
  100% { box-shadow: 0 0 0 0 rgba(100,255,218,0); }
}

/* ===== Hero ===== */
.hero { padding: clamp(70px, 13vh, 130px) 0 90px; }
.hero__title {
  font-size: clamp(3rem, 11vw, 6.5rem);
  font-weight: 700;
  background: linear-gradient(120deg, #ffffff 10%, var(--accent) 45%, var(--accent-2) 70%, #ffffff 100%);
  background-size: 220% auto;
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin-bottom: 22px;
  animation: gradientShift 9s linear infinite;
}
@keyframes gradientShift { to { background-position: 220% center; } }

.hero__lead {
  max-width: 620px;
  font-size: clamp(1.05rem, 2.4vw, 1.35rem);
  color: var(--text-dim);
  margin: 0 0 32px;
}

/* ===== Stats ===== */
.hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin: 0 0 36px;
}
.stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px 22px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  min-width: 150px;
  transition: transform 0.2s, border-color 0.2s, background 0.2s;
}
.stat:hover {
  transform: translateY(-3px);
  border-color: var(--border-strong);
  background: var(--surface-2);
}
.stat__value {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent);
  line-height: 1.1;
}
.stat__label { font-size: 0.82rem; color: var(--text-mute); }

.hero__actions { display: flex; flex-wrap: wrap; gap: 14px; }

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 26px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.96rem;
  border: 1px solid transparent;
  transition: transform 0.12s ease-out, box-shadow 0.25s, background 0.25s, border-color 0.2s;
}
.btn--primary {
  background: var(--accent);
  color: #04140f;
  box-shadow: 0 6px 24px -6px var(--accent-glow);
}
.btn--primary:hover { box-shadow: 0 10px 34px -6px var(--accent-glow); }
.btn--ghost {
  border-color: var(--border-strong);
  color: var(--text);
  background: var(--surface);
}
.btn--ghost:hover { border-color: var(--accent); color: var(--accent); }

/* ===== About ===== */
.about { max-width: 760px; display: grid; gap: 18px; }
.about p { margin: 0; color: var(--text-dim); font-size: 1.08rem; }
.about b { color: var(--text); font-weight: 600; }

/* ===== Cards ===== */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 18px;
}
.card {
  position: relative;
  padding: 26px 24px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  overflow: hidden;
  transition: transform 0.22s, border-color 0.22s, background 0.22s,
              opacity 0.6s ease, translate 0.6s ease;
}
.card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(420px circle at var(--mx, 50%) var(--my, 0%), rgba(100,255,218,0.10), transparent 60%);
  opacity: 0;
  transition: opacity 0.3s;
  pointer-events: none;
}
.card:hover {
  transform: translateY(-4px);
  border-color: var(--border-strong);
  background: var(--surface-2);
}
.card:hover::before { opacity: 1; }
.card__icon { font-size: 1.5rem; color: var(--accent); margin-bottom: 14px; }
.card__title { font-size: 1.12rem; margin-bottom: 8px; }
.card__text { color: var(--text-dim); font-size: 0.96rem; margin: 0; }

/* ===== Stack intro (narrative) ===== */
.stack-intro {
  max-width: 800px;
  display: grid;
  gap: 16px;
  margin-bottom: 44px;
}
.stack-intro p { margin: 0; color: var(--text-dim); font-size: 1.08rem; }
.stack-intro b { color: var(--accent); font-weight: 600; }
.stack-intro__note {
  font-size: 0.95rem !important;
  color: var(--text-mute) !important;
  font-style: italic;
}

/* ===== Stack ===== */
.stack {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 28px 36px;
}
.stack__group {
  transition: opacity 0.6s ease, translate 0.6s ease;
}
.stack__label {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-mute);
  margin-bottom: 14px;
}
.chips { list-style: none; display: flex; flex-wrap: wrap; gap: 9px; margin: 0; padding: 0; }
.chip {
  padding: 7px 14px;
  font-size: 0.88rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--text-dim);
  cursor: default;
  transition: color 0.2s, border-color 0.2s, transform 0.2s, background 0.2s, box-shadow 0.2s;
}
.chip:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: rgba(100, 255, 218, 0.06);
  transform: translateY(-3px);
  box-shadow: 0 6px 18px -8px var(--accent-glow);
}

/* ===== Contacts ===== */
.contacts__lead { color: var(--text-dim); font-size: 1.1rem; margin: 0 0 28px; }
.contacts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
  max-width: 720px;
}
.contact-card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 22px 24px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  transition: transform 0.2s, border-color 0.2s, background 0.2s;
}
.contact-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
  background: var(--surface-2);
}
.contact-card__label { font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-mute); }
.contact-card__value { font-size: 1.15rem; font-weight: 600; color: var(--text); }
.contact-card:hover .contact-card__value { color: var(--accent); }

/* ===== Footer ===== */
.site-footer {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 28px 24px 48px;
  border-top: 1px solid var(--border);
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  justify-content: space-between;
  font-size: 0.82rem;
  color: var(--text-mute);
}

/* ===== Reveal animation ===== */
.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.is-visible { opacity: 1; transform: none; }

/* staggered children (cards, stack groups) */
.stagger { opacity: 0; translate: 0 18px; }
.stagger.is-visible { opacity: 1; translate: 0 0; }

@media (prefers-reduced-motion: reduce) {
  .reveal, .stagger { opacity: 1 !important; transform: none !important; translate: none !important; transition: none; }
  .hero__title, .status-dot { animation: none; }
  html { scroll-behavior: auto; }
  .bg-glow { transition: none; }
}

/* ===== Responsive ===== */
@media (max-width: 720px) {
  .nav { display: none; }
  .site-header { gap: 12px; }
  .lang-switch { margin-left: auto; }
  .section { padding: 60px 0; }
  .hero { padding-top: 52px; }
  .stat { flex: 1 1 140px; min-width: 0; }
}