:root {
  font-family: system-ui, sans-serif;
  background: #f4f6fb;
  color: #1c2a42;
  font-synthesis: none;
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
  padding: 0 5vw 58vh;
}
main {
  max-width: 1240px;
  margin: auto;
}
.masthead {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24px 0;
  border-bottom: 1px solid #dce3ef;
}
.wordmark {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #1c2a42;
  text-decoration: none;
  font-size: 0.9375rem;
  font-weight: 700;
  letter-spacing: -0.025em;
}
.logo {
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  border-radius: 8px;
  background: #255fe5;
  color: #fff;
  font-size: 1.4375rem;
}
.demo-tag,
.local-tag {
  font:
    600 0.625rem ui-monospace,
    monospace;
  letter-spacing: 0.08em;
  color: #71809a;
}
.intro {
  position: relative;
  padding: 24px 0 18px;
}
.eyebrow {
  margin: 0 0 12px;
  color: #255fe5;
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}
h1 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 3.125rem);
  letter-spacing: -0.055em;
  line-height: 1.04;
  font-weight: 750;
}
.intro > p:last-child {
  position: absolute;
  right: 0;
  bottom: 26px;
  width: 370px;
  margin: 0;
  color: #65738b;
  font-size: 0.875rem;
  line-height: 1.7;
}
.demo-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}
.card {
  padding: 20px 24px 16px;
  border: 1px solid #dbe3f1;
  border-radius: 12px;
  background: #fff;
  box-shadow: 0 3px 10px #24385d04;
}
.step {
  font:
    600 0.5625rem ui-monospace,
    monospace;
  letter-spacing: 0.09em;
  color: #7a89a1;
}
h2 {
  margin: 9px 0;
  font-size: 1.1875rem;
  letter-spacing: -0.035em;
}
.card > p:not(.result) {
  margin: 0 0 18px;
  color: #65738b;
  font-size: 0.8125rem;
  line-height: 1.6;
}
button {
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 10px 14px;
  border: 1px solid #cdd9ee;
  border-radius: 6px;
  background: #f7f9ff;
  color: #214d9c;
  font: 600 0.75rem system-ui;
  cursor: pointer;
}
button.primary {
  background: #255fe5;
  border-color: #255fe5;
  color: white;
}
button:hover {
  filter: brightness(0.96);
}
button:focus-visible,
input:focus-visible,
select:focus-visible {
  outline: 2px solid #255fe5;
  outline-offset: 3px;
}
button:disabled {
  opacity: 0.6;
  cursor: wait;
}
.event-fields {
  display: grid;
  grid-template-columns: 1fr 110px;
  gap: 12px;
  margin: 12px 0;
}
label {
  display: grid;
  gap: 5px;
  color: #6b7a92;
  font-size: 0.625rem;
  font-weight: 600;
}
input,
select {
  width: 100%;
  min-width: 0;
  border: 1px solid #dbe3f1;
  border-radius: 5px;
  padding: 8px 9px;
  background: white;
  color: #283c5a;
  font: 0.75rem system-ui;
}
.result {
  margin: 12px 0 0;
  min-height: 16px;
  color: #71809a;
  font:
    0.625rem/1.5 ui-monospace,
    monospace;
}
.extension-note {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 15px 0;
}
.extension-note p {
  max-width: 670px;
  margin: 0;
  color: #6b7a92;
  font-size: 0.6875rem;
  line-height: 1.6;
}
.extension-note strong {
  color: #334968;
}
.extension-symbol {
  color: #255fe5;
  font-size: 1.5rem;
}
.local-tag {
  margin-left: auto;
  white-space: nowrap;
  font-size: 0.5625rem;
}
@media (max-width: 800px) {
  .intro > p:last-child {
    position: static;
    width: auto;
    max-width: 480px;
    margin-top: 15px;
  }
  .demo-grid {
    grid-template-columns: 1fr;
  }
  .demo-tag {
    font-size: 0.5rem;
  }
  .local-tag {
    display: none;
  }
  .intro {
    padding-top: 24px;
  }
  .card {
    padding: 18px;
  }
  .extension-note {
    align-items: flex-start;
  }
  .wordmark {
    font-size: 0.75rem;
  }
  body {
    padding-bottom: 70vh;
  }
}
.socket-card {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 30px;
}
.socket-card p:not(.result) {
  color: #65738b;
  font-size: 0.8125rem;
  line-height: 1.6;
  margin: 0;
}
.socket-card a {
  color: #2457b8;
}
.socket-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 10px;
}
.socket-actions button {
  padding: 8px 11px;
  gap: 8px;
}
.socket-card input {
  font-family: ui-monospace, monospace;
}
@media (max-width: 800px) {
  .socket-card {
    grid-template-columns: 1fr;
    gap: 16px;
  }
}
.columns-example {
  margin-top: 12px;
  font-size: 0.75rem;
  color: #526680;
}
.columns-example summary {
  cursor: pointer;
}
.columns-example pre {
  padding: 12px;
  background: #14243a;
  color: #dbeafe;
  border: 1px solid #3c587c;
  border-radius: 8px;
  overflow: auto;
  font-size: 0.6875rem;
  line-height: 1.7;
}
.column-options {
  border: 0;
  padding: 0;
  margin: 16px 0 0;
  font-size: 0.75rem;
  color: #526680;
}
.column-options legend {
  font-size: 0.625rem;
  font-weight: 650;
  color: #526680;
  margin-bottom: 9px;
}
.column-options,
#column-choices {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
}
.column-options label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
}
.column-options input {
  margin: 0;
  padding: 0;
  accent-color: #255fe5;
  width: 14px;
  height: 14px;
}
.socket-card > * {
  min-width: 0;
}

.theme-choice {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  border: 1px solid #d9c7f7;
  border-radius: 12px;
  padding: 12px 16px;
  background: linear-gradient(110deg, #faf5ff, #f0e7ff);
  color: #6024b5;
  font-weight: 600;
}
.theme-choice input {
  width: 16px;
  height: 16px;
  margin: 0;
  padding: 0;
  flex: 0 0 auto;
  accent-color: #7c3aed;
}