/* ---------- reset / base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

:root {
  --bg: #07090d;
  --bg-2: #0b0f16;
  --surface: rgba(255, 255, 255, 0.03);
  --border: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.14);
  --text: #e6ebf2;
  --muted: #8a93a3;
  --accent: #4ade80;       /* fintech mint */
  --accent-2: #22d3ee;     /* electric cyan */
  --accent-3: #a78bfa;     /* violet */
  --grad: linear-gradient(135deg, #4ade80 0%, #22d3ee 50%, #a78bfa 100%);
  --mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

body {
  font-family: var(--sans);
  color: var(--text);
  background: var(--bg);
  background-image:
    radial-gradient(1200px 600px at 80% -10%, rgba(34, 211, 238, 0.08), transparent 60%),
    radial-gradient(900px 500px at -10% 30%, rgba(167, 139, 250, 0.07), transparent 60%),
    linear-gradient(180deg, #07090d 0%, #0a0d14 100%);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  line-height: 1.55;
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
}

/* ---------- decorative background ---------- */
.bg-grid {
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.025) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 30%, #000 30%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 30%, #000 30%, transparent 80%);
  pointer-events: none;
  z-index: 0;
}

.bg-orb {
  position: fixed;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.35;
  pointer-events: none;
  z-index: 0;
  animation: float 18s ease-in-out infinite;
}
.bg-orb-1 {
  width: 520px; height: 520px;
  background: radial-gradient(circle, #22d3ee 0%, transparent 60%);
  top: -160px; right: -120px;
}
.bg-orb-2 {
  width: 600px; height: 600px;
  background: radial-gradient(circle, #a78bfa 0%, transparent 60%);
  bottom: -200px; left: -160px;
  animation-delay: -9s;
}
@keyframes float {
  0%, 100% { transform: translate(0, 0); }
  50% { transform: translate(20px, -30px); }
}

/* ---------- nav ---------- */
.nav {
  position: relative;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 28px 48px;
  max-width: 1200px;
  margin: 0 auto;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text);
  font-weight: 600;
  letter-spacing: -0.01em;
}
.brand-mark {
  display: grid;
  place-items: center;
  width: 32px; height: 32px;
  border-radius: 8px;
  background: var(--grad);
  color: #07090d;
  font-weight: 800;
  font-size: 16px;
}
.brand-name { font-family: var(--mono); font-size: 14px; color: var(--muted); }

.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  backdrop-filter: blur(10px);
  font-family: var(--mono);
  font-size: 12px;
}
.lang-btn {
  background: transparent;
  border: 0;
  color: var(--muted);
  cursor: pointer;
  font-family: inherit;
  font-size: inherit;
  font-weight: 500;
  padding: 4px 8px;
  border-radius: 999px;
  transition: color 0.18s ease, background 0.18s ease;
}
.lang-btn:hover { color: var(--text); }
.lang-btn.active {
  color: #07090d;
  background: var(--accent);
}
.lang-sep { color: var(--border-strong); }

/* ---------- hero ---------- */
.hero {
  position: relative;
  z-index: 1;
  padding: 80px 48px 120px;
  max-width: 1200px;
  margin: 0 auto;
}
.hero-inner { max-width: 880px; }

.eyebrow {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--accent);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin: 0 0 24px;
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.eyebrow::before {
  content: "";
  width: 28px; height: 1px;
  background: var(--accent);
}

.title {
  font-size: clamp(40px, 7vw, 84px);
  line-height: 1.04;
  letter-spacing: -0.03em;
  font-weight: 700;
  margin: 0 0 28px;
}
.title-line { display: block; }
.title-line.gradient {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.lead {
  font-size: clamp(16px, 1.4vw, 19px);
  color: var(--muted);
  max-width: 640px;
  margin: 0 0 36px;
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 44px;
}
.tag {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--text);
  padding: 8px 14px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  backdrop-filter: blur(10px);
}

.cta {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 22px;
  background: var(--accent);
  color: #07090d;
  text-decoration: none;
  font-weight: 600;
  font-size: 14px;
  border-radius: 10px;
  transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
  box-shadow: 0 0 0 0 rgba(74, 222, 128, 0.4);
}
.cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 30px rgba(74, 222, 128, 0.25);
}
.cta svg { transition: transform 0.18s ease; }
.cta:hover svg { transform: translateY(2px); }

/* ---------- about ---------- */
.about {
  position: relative;
  z-index: 1;
  padding: 80px 48px 120px;
  max-width: 1200px;
  margin: 0 auto;
  border-top: 1px solid var(--border);
}
.about-inner { }

.section-label {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin: 0 0 16px;
}
.section-title {
  font-size: clamp(32px, 4.5vw, 52px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  font-weight: 700;
  margin: 0 0 56px;
}

.about-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 64px;
  align-items: start;
}

.about-text p {
  font-size: 17px;
  color: #c8cfdb;
  margin: 0 0 22px;
  max-width: 56ch;
}
.about-text p:last-child { margin-bottom: 0; }
.about-text em {
  color: var(--accent);
  font-style: normal;
  font-family: var(--mono);
  font-size: 0.92em;
}

.stack {
  padding: 28px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.03), rgba(255, 255, 255, 0.01));
  backdrop-filter: blur(10px);
  position: relative;
  overflow: hidden;
}
.stack::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 16px;
  padding: 1px;
  background: linear-gradient(135deg, rgba(74, 222, 128, 0.3), transparent 40%, rgba(167, 139, 250, 0.25));
  -webkit-mask:
    linear-gradient(#000 0 0) content-box,
    linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
}

.stack-title {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin: 0 0 20px;
  font-weight: 500;
}

.stack-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 18px;
}
.stack-list li {
  display: flex;
  align-items: flex-start;
  gap: 14px;
}
.dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--accent);
  margin-top: 8px;
  flex-shrink: 0;
  box-shadow: 0 0 12px rgba(74, 222, 128, 0.6);
}
.stack-list strong {
  display: block;
  font-weight: 600;
  font-size: 15px;
  color: var(--text);
  margin-bottom: 2px;
}
.stack-list span:not(.dot) {
  display: block;
  color: var(--muted);
  font-size: 13.5px;
  line-height: 1.5;
}

/* ---------- contact ---------- */
.contact {
  position: relative;
  z-index: 1;
  padding: 80px 48px 120px;
  max-width: 1200px;
  margin: 0 auto;
  border-top: 1px solid var(--border);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.3fr;
  gap: 64px;
  align-items: start;
}

.contact-aside {
  position: sticky;
  top: 32px;
}
.contact-lead {
  font-size: 17px;
  color: #c8cfdb;
  margin: 0 0 28px;
  max-width: 42ch;
}

.contact-direct {
  display: inline-flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  padding: 16px 20px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
  backdrop-filter: blur(10px);
  text-decoration: none;
  color: var(--text);
  max-width: 100%;
  transition: border-color 0.2s ease, transform 0.2s ease, background 0.2s ease;
}
.contact-direct:hover {
  border-color: rgba(74, 222, 128, 0.4);
  background: rgba(74, 222, 128, 0.04);
  transform: translateY(-1px);
}
.contact-direct-label {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}
.contact-direct-value {
  font-family: var(--mono);
  font-size: 14px;
  color: var(--text);
  word-break: break-all;
  min-width: 0;
}
.contact-direct svg {
  color: var(--muted);
  transition: color 0.2s ease, transform 0.2s ease;
}
.contact-direct:hover svg {
  color: var(--accent);
  transform: translate(2px, -2px);
}

.contact-form {
  position: relative;
  padding: 36px;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.03), rgba(255, 255, 255, 0.01));
  backdrop-filter: blur(10px);
  display: flex;
  flex-direction: column;
  gap: 22px;
  overflow: hidden;
}
.contact-form::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 18px;
  padding: 1px;
  background: linear-gradient(135deg, rgba(34, 211, 238, 0.28), transparent 45%, rgba(167, 139, 250, 0.22));
  -webkit-mask:
    linear-gradient(#000 0 0) content-box,
    linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.field label {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 500;
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  font-family: var(--sans);
  font-size: 15px;
  color: var(--text);
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px 16px;
  outline: none;
  transition: border-color 0.2s ease, background 0.2s ease, box-shadow 0.2s ease;
  -webkit-appearance: none;
          appearance: none;
}
.contact-form textarea {
  resize: vertical;
  min-height: 128px;
  line-height: 1.55;
  font-family: var(--sans);
}
.contact-form input::placeholder,
.contact-form textarea::placeholder {
  color: rgba(138, 147, 163, 0.6);
}
.contact-form input:hover,
.contact-form textarea:hover {
  border-color: var(--border-strong);
}
.contact-form input:focus,
.contact-form textarea:focus {
  border-color: rgba(74, 222, 128, 0.55);
  background: rgba(74, 222, 128, 0.04);
  box-shadow: 0 0 0 4px rgba(74, 222, 128, 0.10);
}
.contact-form input:invalid:not(:placeholder-shown),
.contact-form textarea:invalid:not(:placeholder-shown) {
  border-color: rgba(248, 113, 113, 0.45);
}
.contact-form input:autofill,
.contact-form input:-webkit-autofill {
  -webkit-text-fill-color: var(--text);
  -webkit-box-shadow: 0 0 0 1000px #0d1119 inset;
  caret-color: var(--text);
}

.contact-submit {
  margin-top: 6px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 15px 22px;
  background: var(--accent);
  color: #07090d;
  font-family: var(--sans);
  font-weight: 600;
  font-size: 14px;
  letter-spacing: 0.01em;
  border: 0;
  border-radius: 10px;
  cursor: pointer;
  transition: transform 0.18s ease, box-shadow 0.2s ease, background 0.18s ease;
  box-shadow: 0 0 0 0 rgba(74, 222, 128, 0.4);
}
.contact-submit:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 30px rgba(74, 222, 128, 0.25);
}
.contact-submit:active { transform: translateY(0); }
.contact-submit svg { transition: transform 0.2s ease; }
.contact-submit:hover svg { transform: translateX(3px); }
.contact-submit:focus-visible {
  outline: 2px solid var(--accent-2);
  outline-offset: 3px;
}

.contact-note {
  margin: 4px 0 0;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.02em;
  color: var(--muted);
  text-align: center;
}

/* ---------- footer ---------- */
.foot {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--border);
  padding: 28px 48px;
  max-width: 1200px;
  margin: 0 auto;
}
.foot-inner {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--muted);
}
.foot-name { color: var(--text); }
.foot-sep { color: var(--border-strong); }

/* ---------- responsive ---------- */
@media (max-width: 860px) {
  .nav { padding: 20px 24px; }
  .hero { padding: 48px 24px 80px; }
  .about { padding: 56px 24px 80px; }
  .contact { padding: 56px 24px 80px; }
  .foot { padding: 24px; }

  .about-grid,
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .contact-aside { position: static; }
  .contact-form { padding: 24px; gap: 18px; }
  .section-title { margin-bottom: 36px; }
  .hero-tags { margin-bottom: 32px; }
  .bg-orb-1 { width: 360px; height: 360px; }
  .bg-orb-2 { width: 380px; height: 380px; }

  .contact-direct {
    display: flex;
    width: 100%;
  }
  .contact-submit {
    width: 100%;
  }
}

@media (max-width: 480px) {
  .brand-name { display: none; }
  .lead { font-size: 16px; }
  .stack { padding: 22px; }

  .nav { padding: 16px 20px; }
  .hero { padding: 36px 20px 64px; }
  .about { padding: 48px 20px 72px; }
  .contact { padding: 48px 20px 72px; }
  .foot { padding: 20px; }

  .contact-form { padding: 20px; gap: 16px; }
  .contact-form input,
  .contact-form textarea {
    font-size: 16px;
    padding: 12px 14px;
  }
  .contact-form textarea { min-height: 112px; }

  .contact-direct {
    align-items: flex-start;
    flex-direction: column;
    gap: 6px;
    padding: 14px 16px;
  }
  .contact-direct svg { display: none; }
  .contact-direct-value { font-size: 13px; }

  .contact-lead { font-size: 16px; margin-bottom: 22px; }
  .section-title { margin-bottom: 28px; }
}