:root {
  --bg: #f5f8fc;
  --text: #0a1930;
  --muted: #5b687b;
  --card: #ffffff;
  --accent: #1974ef;
  --accent-dark: #0b4fb8;
  --border: #dfe6ef;
  --green: #087d61;
  --danger: #a13f00;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background: radial-gradient(circle at 50% 0, #fff 0, var(--bg) 48%);
  line-height: 1.6;
}

a {
  color: inherit;
}

button,
input,
select {
  font: inherit;
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
summary:focus-visible {
  outline: 3px solid #ffcc4d;
  outline-offset: 3px;
}

.site-header {
  min-height: 390px;
  padding: 0 6% 74px;
  color: #fff;
  background:
    linear-gradient(90deg, rgba(2, 15, 36, .95), rgba(2, 20, 46, .72) 52%, rgba(3, 21, 47, .2)),
    linear-gradient(135deg, #04152d, #176be0);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 84px;
  max-width: 1380px;
  margin: 0 auto 42px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 11px;
  font-size: 1.45rem;
  font-weight: 800;
  letter-spacing: 0;
  text-decoration: none;
}

.logo::before {
  content: "";
  width: 39px;
  height: 39px;
  background:
    linear-gradient(90deg, transparent 46%, #72b7ff 47% 53%, transparent 54%),
    linear-gradient(63deg, transparent 45%, #72b7ff 46% 50%, transparent 51%),
    linear-gradient(-63deg, transparent 45%, #72b7ff 46% 50%, transparent 51%);
  border-bottom: 2px solid #72b7ff;
}

.navlinks {
  display: flex;
  gap: 28px;
  flex-wrap: wrap;
}

.navlinks a {
  font-size: .92rem;
  font-weight: 700;
  text-decoration: none;
  color: #eaf1f9;
}

.hero {
  max-width: 760px;
  margin: 0 auto 0 max(0px, calc((100% - 1380px) / 2));
}

.eyebrow,
.tag {
  margin: 0 0 12px;
  color: #8fc6ff;
  font-size: .75rem;
  font-weight: 800;
  letter-spacing: .14em;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0 0 18px;
  font-size: clamp(2.7rem, 6vw, 5rem);
  line-height: 1.02;
  letter-spacing: 0;
}

.hero p:not(.eyebrow) {
  max-width: 680px;
  margin: 0;
  color: #e6edf8;
  font-size: 1.1rem;
}

main {
  max-width: 1500px;
  margin: auto;
  padding: 0 6% 70px;
}

.tool-shell {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
  margin-top: -46px;
}

.panel,
.info-section {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: 0 12px 34px rgba(8, 30, 65, .09);
}

.panel {
  padding: 24px;
}

.panel-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 20px;
}

.tag {
  display: inline-block;
  margin-bottom: 8px;
  color: #1259be;
  background: #eaf2ff;
  padding: 4px 9px;
  border-radius: 999px;
}

h2 {
  margin: 0;
  color: #081a34;
  font-size: clamp(1.45rem, 3vw, 2rem);
  line-height: 1.2;
}

.result-pill {
  flex: none;
  min-width: 112px;
  padding: 10px 14px;
  border-radius: 10px;
  background: #edf4ff;
  color: var(--accent-dark);
  font-weight: 900;
  text-align: center;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

label {
  display: grid;
  gap: 7px;
  min-width: 0;
  color: #102346;
  font-size: .88rem;
  font-weight: 800;
}

.wide {
  grid-column: 1 / -1;
}

input,
select {
  width: 100%;
  min-height: 46px;
  padding: 0 13px;
  border: 1px solid #cfdbea;
  border-radius: 10px;
  background: #fff;
  color: var(--text);
}

button {
  min-height: 48px;
  align-self: end;
  border: 0;
  border-radius: 10px;
  background: var(--accent);
  color: #fff;
  font-weight: 900;
  cursor: pointer;
  box-shadow: 0 10px 24px rgba(4, 72, 165, .22);
}

button:hover {
  background: var(--accent-dark);
}

.status {
  min-height: 26px;
  margin: 16px 0 10px;
  color: var(--muted);
  font-weight: 700;
}

.status.error {
  color: var(--danger);
}

details {
  border-top: 1px solid var(--border);
  padding-top: 14px;
}

summary {
  cursor: pointer;
  color: var(--accent-dark);
  font-weight: 900;
}

.details-list {
  display: grid;
  grid-template-columns: minmax(180px, .8fr) minmax(0, 1fr);
  gap: 9px 16px;
  margin: 16px 0 0;
}

.details-list dt {
  color: var(--muted);
  font-weight: 800;
}

.details-list dd {
  margin: 0;
  overflow-wrap: anywhere;
  font-family: ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", monospace;
}

.info-section {
  margin-top: 34px;
  padding: 24px;
}

.info-section p {
  max-width: 920px;
  margin: 12px 0 0;
  color: var(--muted);
}

code {
  padding: 2px 5px;
  border-radius: 5px;
  background: #edf4ff;
  color: #0e55bc;
}

footer {
  padding: 32px 7%;
  background: #061b38;
  color: #aebdd0;
  text-align: center;
}

@media (max-width: 960px) {
  .tool-shell {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .site-header {
    padding-inline: 22px;
  }

  .nav {
    align-items: flex-start;
    flex-direction: column;
    padding-top: 18px;
  }

  main {
    padding-inline: 18px;
  }

  .form-grid,
  .details-list {
    grid-template-columns: 1fr;
  }

  .panel-head {
    flex-direction: column;
  }

  .result-pill {
    width: 100%;
  }
}