:root {
  --bg: #08101c;
  --bg2: #0f1f32;
  --card: rgba(13, 24, 42, 0.84);
  --card2: rgba(17, 32, 56, 0.9);
  --text: #eef4ff;
  --muted: #b2c1e8;
  --accent: #6fb1ff;
  --accent2: #4ce0c0;
  --accent3: #ffd36d;
  --border: rgba(171, 203, 255, 0.14);
  --shadow: 0 20px 70px rgba(0, 0, 0, 0.34);
  --glow: 0 0 0 1px rgba(111, 177, 255, 0.08) inset;
  color: var(--text);
  background: var(--bg);
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  font-synthesis: none;
  line-height: 1.55;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  min-width: 320px;
  min-height: 100vh;
  margin: 0;
  background:
    radial-gradient(1300px 760px at 15% -10%, rgba(111, 177, 255, 0.28), transparent 56%),
    radial-gradient(900px 620px at 100% 0%, rgba(76, 224, 192, 0.18), transparent 50%),
    radial-gradient(900px 700px at 50% 120%, rgba(255, 211, 109, 0.08), transparent 42%),
    linear-gradient(180deg, var(--bg) 0%, var(--bg2) 100%);
}

button,
input {
  font: inherit;
}

button {
  cursor: pointer;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

h1,
h2,
p {
  margin: 0;
}

p {
  color: var(--muted);
}

.container {
  width: min(1100px, 100%);
  margin: 0 auto;
  padding: 0 20px;
}

.navwrap {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(8, 16, 28, 0.72);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.16);
  backdrop-filter: blur(14px);
}

nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 12px 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-weight: 700;
  letter-spacing: 0;
}

.brand:hover {
  text-decoration: none;
}

.menu {
  display: none;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 36px;
  color: var(--text);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border);
  border-radius: 10px;
}

.navlinks {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
}

.navlinks a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 12px;
  color: var(--muted);
  border: 1px solid transparent;
  border-radius: 12px;
}

.navlinks a:hover {
  color: var(--text);
  background: rgba(255, 255, 255, 0.04);
  border-color: rgba(171, 203, 255, 0.18);
  text-decoration: none;
}

.tool-hero {
  padding: 72px 0 24px;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(280px, 0.8fr);
  gap: 42px;
  align-items: end;
}

.section-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.section-label {
  color: var(--accent2);
  background: transparent;
  border: 0;
  box-shadow: none;
  padding: 0;
}

h1 {
  max-width: 11ch;
  margin: 18px 0 14px;
  color: var(--text);
  font-size: 58px;
  letter-spacing: -0.04em;
  line-height: 0.98;
}

.lead {
  max-width: 68ch;
  color: var(--muted);
  font-size: 19px;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 14px;
  color: var(--text);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: var(--glow);
  font-size: 14px;
}

.btn:hover {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(171, 203, 255, 0.24);
  text-decoration: none;
}

.btn.secondary {
  background: linear-gradient(180deg, rgba(111, 177, 255, 0.16), rgba(111, 177, 255, 0.08));
  border-color: rgba(111, 177, 255, 0.34);
}

.hero-rail {
  display: grid;
  gap: 14px;
}

.rail-block {
  padding: 18px 0;
  border-top: 1px solid rgba(171, 203, 255, 0.16);
}

.rail-block:first-child {
  padding-top: 0;
  border-top: 0;
}

.rail-label {
  display: block;
  margin-bottom: 8px;
  color: var(--accent2);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.rail-block strong {
  display: block;
  font-size: 18px;
  letter-spacing: -0.02em;
}

.rail-block p {
  margin-top: 8px;
  font-size: 14px;
}

main {
  padding: 18px 0 70px;
}

.band {
  padding: 28px 0;
  border-top: 1px solid rgba(171, 203, 255, 0.1);
}

.tool-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(280px, 0.7fr);
  gap: 32px;
  align-items: start;
}

.validator-panel {
  padding: 22px;
  background: linear-gradient(180deg, rgba(17, 32, 56, 0.9), rgba(13, 24, 42, 0.84));
  border: 1px solid var(--border);
  border-radius: 20px;
  box-shadow: var(--shadow), var(--glow);
}

.validator-panel h2,
.disclaimer h2 {
  margin-top: 8px;
  color: var(--text);
  font-size: 32px;
  letter-spacing: -0.04em;
  line-height: 1.02;
}

.validator-form {
  display: grid;
  gap: 10px;
  margin-top: 24px;
}

label {
  color: var(--text);
  font-size: 14px;
  font-weight: 700;
}

.input-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px;
}

input {
  width: 100%;
  min-height: 56px;
  padding: 0 16px;
  color: var(--text);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(171, 203, 255, 0.2);
  border-radius: 14px;
  box-shadow: var(--glow);
  font-size: 1.35rem;
  letter-spacing: 0.04em;
  outline: none;
}

input::placeholder {
  color: rgba(178, 193, 232, 0.55);
}

input:focus {
  border-color: rgba(76, 224, 192, 0.5);
  box-shadow: 0 0 0 4px rgba(76, 224, 192, 0.12), var(--glow);
}

.input-row button {
  min-height: 56px;
  padding: 0 18px;
  color: var(--text);
  background: linear-gradient(180deg, rgba(111, 177, 255, 0.16), rgba(111, 177, 255, 0.08));
  border: 1px solid rgba(111, 177, 255, 0.34);
  border-radius: 14px;
  box-shadow: var(--glow);
  font-weight: 700;
}

.input-row button:hover {
  background: rgba(255, 255, 255, 0.06);
}

.help-text {
  color: var(--muted);
  font-size: 0.92rem;
}

.result {
  display: block;
  margin-top: 20px;
  padding: 16px;
  color: var(--text);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(171, 203, 255, 0.16);
  border-radius: 14px;
  box-shadow: var(--glow);
  font-weight: 700;
}

.result.valid {
  color: #dffdf3;
  background: rgba(76, 224, 192, 0.1);
  border-color: rgba(76, 224, 192, 0.32);
}

.result.invalid {
  color: #ffe9ac;
  background: rgba(255, 211, 109, 0.1);
  border-color: rgba(255, 211, 109, 0.32);
}

.result.idle {
  color: var(--muted);
}

.disclaimer {
  display: grid;
  gap: 12px;
  padding-top: 18px;
  border-top: 1px solid rgba(171, 203, 255, 0.16);
}

.disclaimer p {
  font-size: 15px;
}

footer {
  padding: 0 0 42px;
}

.fine {
  color: var(--muted);
  font-size: 13px;
}

@media (max-width: 900px) {
  .menu {
    display: inline-flex;
  }

  .navlinks {
    display: none;
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-start;
    width: 100%;
    gap: 6px;
    margin-top: 10px;
  }

  .navwrap.nav-open .navlinks {
    display: flex;
  }

  .navlinks a {
    width: 100%;
    padding: 10px 12px;
  }

  nav {
    flex-wrap: wrap;
  }

  .tool-hero {
    padding: 42px 0 10px;
  }

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

  h1 {
    max-width: none;
    font-size: 40px;
  }

  .lead {
    font-size: 15px;
  }

  .validator-panel {
    padding: 18px;
  }
}

@media (max-width: 560px) {
  h1 {
    font-size: 34px;
  }

  .input-row {
    grid-template-columns: 1fr;
  }

  .input-row button,
  .btn {
    width: 100%;
    justify-content: center;
  }
}