body {
  margin: 0;
  font-family: system-ui, sans-serif;
  background:
    radial-gradient(circle at top, #1e293b 0%, #0f172a 45%, #020617 100%);
  color: #f8fafc;
  min-height: 100vh;
  padding: 32px 18px;
}

.page {
  width: 100%;
  max-width: 980px;
  margin: 0 auto;
}

.hidden {
  display: none;
}

.hero,
.card {
  background: rgba(15, 23, 42, 0.72);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 28px;
  padding: 28px;
  margin: 18px 0;
  backdrop-filter: blur(18px);
  box-shadow:
    0 20px 60px rgba(0,0,0,0.35),
    inset 0 1px 0 rgba(255,255,255,0.05);
}

.logo {
  display: inline-block;
  padding: 8px 14px;
  border-radius: 999px;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.08);
  font-size: 13px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: #cbd5e1;
  margin-bottom: 18px;
}

h1 {
  font-size: clamp(38px, 6vw, 68px);
  line-height: 0.98;
  margin: 0 0 22px;
  letter-spacing: -0.04em;
}

h2 {
  margin: 0 0 14px;
  font-size: 22px;
}

.accent {
  color: #38bdf8;
}

.muted {
  color: #cbd5e1;
  font-size: 15px;
  line-height: 1.6;
}

label {
  display: block;
  margin-top: 14px;
  font-weight: 650;
  color: #e2e8f0;
}

input,
select,
button {
  width: 100%;
  box-sizing: border-box;
  padding: 13px 14px;
  margin-top: 7px;
  font-size: 16px;
  border-radius: 14px;
  border: 1px solid rgba(255,255,255,0.14);
}

input,
select {
  background: rgba(255,255,255,0.06);
  color: #f8fafc;
}

input::placeholder {
  color: #94a3b8;
}

select option {
  color: #111827;
}

button,
.btn {
  display: inline-block;
  text-align: center;
  text-decoration: none;
  cursor: pointer;
  background: #38bdf8;
  color: #082f49;
  border: none;
  font-weight: 750;
  transition: opacity .18s ease, transform .18s ease;
}

button:hover,
.btn:hover {
  opacity: 0.92;
  transform: translateY(-1px);
}

button:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.btn.secondary {
  background: rgba(255,255,255,0.08);
  color: #f8fafc;
}

pre {
  background: rgba(2, 6, 23, 0.6);
  color: #e2e8f0;
  padding: 14px;
  border-radius: 16px;
  white-space: pre-wrap;
  word-break: break-word;
  border: 1px solid rgba(255,255,255,0.08);
}

.grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.grid3 {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 16px;
}

.ok {
  color: #34d399;
  font-weight: 750;
}

.warn {
  color: #fbbf24;
  font-weight: 750;
}

.bad {
  color: #fb7185;
  font-weight: 750;
}

.status-row {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  padding: 10px 0;
}

.hash {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 12px;
  word-break: break-all;
  color: #cbd5e1;
}

.finish-overlay {
  position: fixed;
  inset: 0;
  z-index: 9999;
  backdrop-filter: blur(7px);
  background: rgba(255, 255, 255, 0.65);
  display: flex;
  align-items: center;
  justify-content: center;
}

.finish-overlay.hidden {
  display: none;
}

.finish-box {
  background: white;
  border-radius: 18px;
  padding: 2rem;
  max-width: 520px;
  width: 90%;
  text-align: center;
  box-shadow: 0 20px 60px rgba(0,0,0,0.18);
}

.finish-box button {
  display: block;
  width: 100%;
  margin-top: 1rem;
}

.footer {
  margin-top: 26px;
  text-align: center;
  color: #94a3b8;
  font-size: 14px;
}

	.language-corner {
  position: fixed;
  top: 18px;
  right: 18px;
  z-index: 1000;
}

.language-select {
  width: auto;
  min-width: 150px;
  padding: 10px 12px;
  border-radius: 999px;
  border: 1px solid rgba(255,255,255,0.14);
  background: rgba(15, 23, 42, 0.82);
  color: #f8fafc;
  backdrop-filter: blur(14px);
}

.language-select option {
  color: #111827;
}

a:link, a:visited, a:hover, a:active {
  text-decoration: none;
}

.official-result {
  border-radius: 18px;
  padding: 24px;
  margin-top: 16px;
  border: 1px solid #ddd;
}


.demo-box {
  border-color: #b68b00;
}

.ok-box {
  border: 2px solid #2e9d57;
  border-radius: 12px;
  padding: 1rem;
}

.warn-box {
  border: 2px solid #d8a21d;
  border-radius: 12px;
  padding: 1rem;
}

.bad-box {
  border: 2px solid #c0392b;
  border-radius: 12px;
  padding: 1rem;
}

.finish-box {
  color: #111;
}

.finish-box h2,
.finish-box p {
  color: #111;
}



    body {
      margin: 0;
      font-family: system-ui, sans-serif;
      background:
        radial-gradient(circle at top, #1e293b 0%, #0f172a 45%, #020617 100%);
      color: #f8fafc;
      min-height: 100vh;
      display: flex;
      align-items: center;
      justify-content: center;
      padding: 24px;
    }

    .container {
      width: 100%;
      max-width: 920px;
    }

    .hero {
      background: rgba(15, 23, 42, 0.72);
      border: 1px solid rgba(255,255,255,0.08);
      border-radius: 28px;
      padding: 48px;
      backdrop-filter: blur(18px);
      box-shadow:
        0 20px 60px rgba(0,0,0,0.45),
        inset 0 1px 0 rgba(255,255,255,0.05);
    }

    .logo {
      display: inline-block;
      padding: 8px 14px;
      border-radius: 999px;
      background: rgba(255,255,255,0.06);
      border: 1px solid rgba(255,255,255,0.08);
      font-size: 13px;
      letter-spacing: 0.12em;
      text-transform: uppercase;
      color: #cbd5e1;
      margin-bottom: 24px;
    }

    h1 {
      font-size: clamp(44px, 7vw, 84px);
      line-height: 0.95;
      margin: 0 0 24px;
      letter-spacing: -0.04em;
    }

    h2 {
      margin: 0 0 14px;
      font-size: 24px;
    }

    h3 {
      margin: 28px 0 10px;
      font-size: 18px;
      color: #f8fafc;
    }

    .headline-accent {
      color: #38bdf8;
    }

    .sub {
      font-size: 20px;
      line-height: 1.7;
      color: #cbd5e1;
      max-width: 760px;
      margin-bottom: 34px;
    }

    .grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
      gap: 18px;
    }

    .card {
      background: rgba(255,255,255,0.04);
      border: 1px solid rgba(255,255,255,0.08);
      border-radius: 22px;
      padding: 24px;
      transition: transform .18s ease, border-color .18s ease, background .18s ease;
    }

    .card:hover {
      transform: translateY(-4px);
      border-color: rgba(56,189,248,0.5);
      background: rgba(255,255,255,0.06);
    }

    .card p,
    .card li {
      color: #cbd5e1;
      line-height: 1.65;
      font-size: 15px;
    }

    .card p {
      margin: 0 0 16px;
    }

    .card ul {
      margin: 0 0 18px;
      padding-left: 20px;
    }

    .content-card {
      background: rgba(255,255,255,0.04);
      border: 1px solid rgba(255,255,255,0.08);
      border-radius: 22px;
      padding: 28px;
      margin-bottom: 18px;
    }

    .content-card p,
    .content-card li {
      color: #cbd5e1;
      line-height: 1.7;
      font-size: 16px;
    }

    .content-card p {
      margin: 0 0 18px;
    }

    .content-card ul {
      margin-top: 0;
      padding-left: 22px;
    }

    .note {
      border-left: 3px solid #38bdf8;
      padding-left: 16px;
      color: #e0f2fe;
    }

    .btn {
      display: inline-block;
      text-decoration: none;
      padding: 12px 18px;
      border-radius: 14px;
      background: #38bdf8;
      color: #082f49;
      font-weight: 700;
      transition: opacity .18s ease, transform .18s ease;
    }

    .btn:hover {
      opacity: 0.92;
      transform: translateY(-1px);
    }

    .btn.secondary {
      background: rgba(255,255,255,0.08);
      color: #f8fafc;
    }

    .footer {
      margin-top: 28px;
      text-align: center;
      color: #94a3b8;
      font-size: 14px;
    }

    .language-corner {
      position: fixed;
      top: 18px;
      right: 18px;
      z-index: 1000;
    }

    .language-select {
      width: auto;
      min-width: 150px;
      padding: 10px 12px;
      border-radius: 999px;
      border: 1px solid rgba(255,255,255,0.14);
      background: rgba(15, 23, 42, 0.82);
      color: #f8fafc;
      backdrop-filter: blur(14px);
    }

    .language-select option {
      color: #111827;
    }

    a:link, a:visited, a:hover, a:active {
      text-decoration: none;
    }

    .footer a,
    .content-card a {
      color: #38bdf8;
    }



@media (max-width: 760px) {
  .hero,
  .card {
    padding: 22px;
    border-radius: 22px;
  }

  .grid,
  .grid3 {
    grid-template-columns: 1fr;
  }
}