:root {
  color-scheme: dark light;
  --font-sans: "Avenir Next", "Segoe UI Variable", "Ubuntu", "Noto Sans", sans-serif;
  --font-mono: "JetBrains Mono", "Iosevka", "Consolas", monospace;

  --bg: #0c1218;
  --bg-2: #101a23;
  --surface: #18232e;
  --surface-strong: #1d2b38;
  --text: #e6f1f9;
  --muted: #aec3d3;
  --line: #314655;
  --accent: #2fc5b6;
  --accent-2: #36b7f1;
  --focus: #67e8f9;
  --danger: #ff9494;
  --chip: #1f2e3a;
  --shadow: 0 10px 24px rgba(0, 0, 0, 0.36);
}

html[data-theme="light"] {
  --bg: #f1f5f8;
  --bg-2: #dce8ef;
  --surface: #ffffff;
  --surface-strong: #f7fbff;
  --text: #142330;
  --muted: #4b6679;
  --line: #bfd1dd;
  --accent: #0f766e;
  --accent-2: #0ea5e9;
  --focus: #0284c7;
  --danger: #b42318;
  --chip: #eff7fb;
  --shadow: 0 10px 24px rgba(19, 35, 47, 0.12);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-tap-highlight-color: rgba(103, 232, 249, 0.2);
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  font-family: var(--font-sans);
  line-height: 1.58;
  background:
    radial-gradient(1000px 520px at -12% -10%, rgba(47, 197, 182, 0.18), transparent 64%),
    radial-gradient(900px 480px at 108% 12%, rgba(54, 183, 241, 0.16), transparent 60%),
    linear-gradient(160deg, var(--bg), var(--bg-2));
  overflow-x: hidden;
}

a {
  color: inherit;
  touch-action: manipulation;
}

button,
input,
textarea {
  touch-action: manipulation;
}

.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  z-index: 100;
  text-decoration: none;
  border: 1px solid var(--line);
  border-radius: 0.65rem;
  background: var(--surface);
  padding: 0.52rem 0.72rem;
}

.skip-link:focus-visible {
  top: 1rem;
}

.site-header,
.page,
.site-footer,
.noscript-note {
  width: min(76rem, calc(100% - 2rem));
  margin-inline: auto;
}

.card {
  position: relative;
  border: 1px solid var(--line);
  border-radius: 1rem;
  background: var(--surface);
  box-shadow: var(--shadow);
  padding: 1.1rem 1.2rem;
}

.card::before {
  content: "";
  position: absolute;
  top: 1px;
  left: 0.72rem;
  right: 0.72rem;
  height: 2px;
  border-radius: 999px;
  background: linear-gradient(90deg, rgba(47, 197, 182, 0.78), rgba(54, 183, 241, 0.78));
  pointer-events: none;
}

.site-header {
  position: sticky;
  top: 0.75rem;
  z-index: 20;
  margin-top: 1rem;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 0.9rem;
}

.brand-wrap {
  display: grid;
  gap: 0.12rem;
}

.brand-domain {
  margin: 0;
  font-family: var(--font-mono);
  letter-spacing: 0.06em;
  font-size: 0.84rem;
  color: var(--muted);
}

.brand-title {
  margin: 0;
  font-size: 1.1rem;
  font-weight: 760;
}

.brand-tagline {
  margin: 0;
  color: var(--muted);
  font-size: 0.88rem;
}

.site-nav {
  min-width: 0;
  overflow-x: auto;
  scrollbar-width: none;
}

.site-nav::-webkit-scrollbar {
  display: none;
}

.site-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  justify-content: center;
  flex-wrap: nowrap;
  gap: 0.32rem;
}

.site-nav a {
  display: inline-block;
  border: 1px solid transparent;
  border-radius: 999px;
  text-decoration: none;
  color: var(--muted);
  white-space: nowrap;
  padding: 0.28rem 0.56rem;
  font-size: 0.84rem;
}

.site-nav a:hover {
  color: var(--text);
  border-color: var(--line);
  background: var(--surface-strong);
}

.site-nav a:focus-visible {
  color: var(--text);
  border-color: var(--accent);
  background: var(--surface-strong);
}

.control-cluster {
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

.language-switch {
  display: inline-flex;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: transparent;
  overflow: hidden;
}

.lang-button,
.theme-button,
.submit-button {
  font: inherit;
}

.lang-button {
  border: 0;
  margin: 0;
  padding: 0.28rem 0.52rem;
  background: transparent;
  color: var(--muted);
  font-size: 0.8rem;
  cursor: pointer;
}

.lang-button[aria-pressed="true"] {
  color: var(--text);
  background: var(--surface-strong);
}

.theme-button {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.28rem 0.62rem;
  background: transparent;
  color: var(--muted);
  font-size: 0.82rem;
  cursor: pointer;
}

.theme-button:hover,
.lang-button:hover {
  color: var(--text);
}

.page {
  margin: 1rem auto 2rem;
  display: grid;
  gap: 1rem;
}

.hero {
  position: relative;
  overflow: hidden;
  padding-block: 1.45rem;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.18;
  background-image: repeating-linear-gradient(
    135deg,
    rgba(54, 183, 241, 0.22) 0,
    rgba(54, 183, 241, 0.22) 1px,
    transparent 1px,
    transparent 14px
  );
}

.hero::after {
  content: "";
  position: absolute;
  right: -72px;
  bottom: -96px;
  width: 230px;
  height: 230px;
  border-radius: 50%;
  pointer-events: none;
  background: radial-gradient(circle, rgba(54, 183, 241, 0.2), transparent 68%);
}

.hero > * {
  position: relative;
  z-index: 1;
}

.eyebrow {
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-size: 0.78rem;
  color: var(--muted);
  font-weight: 700;
}

h1,
h2,
h3 {
  margin: 0;
  line-height: 1.28;
}

h1,
h2 {
  text-wrap: balance;
}

h1 {
  margin-top: 0.44rem;
  font-size: clamp(1.52rem, 2.8vw, 2.2rem);
  max-width: 24ch;
}

h2 {
  font-size: clamp(1.12rem, 2.1vw, 1.48rem);
  margin-bottom: 0.72rem;
}

h3 {
  font-size: 0.98rem;
  margin-bottom: 0.52rem;
}

p {
  margin: 0;
  text-wrap: pretty;
}

p,
li {
  overflow-wrap: anywhere;
}

section[id],
h1[id],
h2[id] {
  scroll-margin-top: 5.8rem;
}

section[id]:target {
  box-shadow: 0 0 0 2px rgba(54, 183, 241, 0.28), var(--shadow);
}

.lead {
  margin-top: 0.76rem;
  max-width: 70ch;
}

.hero-note {
  margin-top: 0.62rem;
  color: var(--muted);
  max-width: 70ch;
}

.hero-quip {
  margin-top: 0.52rem;
  max-width: 70ch;
  color: var(--accent-2);
  font-family: var(--font-mono);
  font-size: 0.86rem;
}

.hero-pills {
  margin: 0.9rem 0 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.hero-pills li {
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--chip);
  padding: 0.22rem 0.56rem;
  font-size: 0.8rem;
  font-family: var(--font-mono);
}

.strip {
  padding-block: 0.72rem;
}

.strip-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.5rem;
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.strip-list li {
  border: 1px dashed var(--line);
  border-radius: 0.72rem;
  background: var(--surface-strong);
  text-align: center;
  padding: 0.42rem 0.5rem;
  font-size: 0.82rem;
  color: var(--muted);
}

.section-intro {
  margin-bottom: 0.6rem;
  color: var(--muted);
}

.checklist,
.signal-list,
.subcard ul {
  margin: 0;
  padding-left: 1.06rem;
}

.checklist {
  list-style: none;
  padding-left: 0;
}

.checklist li,
.signal-list li,
.subcard li {
  margin-bottom: 0.42rem;
}

.checklist li {
  position: relative;
  padding-left: 1.38rem;
}

.checklist li::before {
  content: "->";
  position: absolute;
  left: 0;
  top: 0.08rem;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.78rem;
}

.grid-3 {
  display: grid;
  gap: 0.86rem;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.stacked {
  display: grid;
  gap: 0.86rem;
}

.subcard {
  border: 1px solid var(--line);
  border-radius: 0.82rem;
  background: var(--surface-strong);
  padding: 0.9rem;
  transition: border-color 0.18s ease, transform 0.18s ease;
}

.subcard:hover {
  border-color: var(--accent);
  border-color: color-mix(in oklab, var(--accent) 40%, var(--line));
  transform: translateY(-2px);
}

.subcard p {
  margin-bottom: 0.52rem;
}

.chip-groups {
  display: grid;
  gap: 0.86rem;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.chip-group {
  border: 1px solid var(--line);
  border-radius: 0.82rem;
  background: var(--surface-strong);
  padding: 0.86rem;
}

.chip-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.42rem;
}

.chip {
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--chip);
  padding: 0.22rem 0.54rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  transition: border-color 0.18s ease, transform 0.18s ease;
}

.chip:hover {
  border-color: var(--accent);
  border-color: color-mix(in oklab, var(--accent) 44%, var(--line));
  transform: translateY(-1px);
}

.field-row {
  display: grid;
  gap: 0.82rem;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.field {
  display: grid;
  gap: 0.28rem;
}

.field:focus-within {
  filter: saturate(1.04);
}

label {
  font-weight: 640;
}

input,
textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 0.66rem;
  background: var(--surface-strong);
  color: var(--text);
  padding: 0.66rem 0.74rem;
}

textarea {
  resize: vertical;
  min-height: 9rem;
}

.field-hint {
  margin: 0;
  color: var(--muted);
  font-size: 0.82rem;
}

.field-error {
  margin: 0;
  min-height: 1.18rem;
  color: var(--danger);
  font-size: 0.84rem;
}

input[aria-invalid="true"],
textarea[aria-invalid="true"] {
  border-color: var(--danger);
}

.submit-button {
  margin-top: 0.48rem;
  border: 1px solid var(--line);
  border-radius: 0.72rem;
  background: linear-gradient(140deg, var(--accent), var(--accent-2));
  color: #ffffff;
  padding: 0.68rem 0.98rem;
  font-weight: 700;
  cursor: pointer;
}

.submit-button:disabled {
  opacity: 0.74;
  cursor: wait;
}

.form-status {
  margin: 0.56rem 0 0;
  min-height: 1.18rem;
  color: var(--muted);
  font-size: 0.88rem;
}

.form-status.success {
  color: var(--accent);
}

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

.site-footer {
  margin-bottom: 1.3rem;
}

.site-footer p {
  margin: 0;
  text-align: center;
  color: var(--muted);
  font-size: 0.88rem;
}

.noscript-note {
  margin: 0 auto 1.35rem;
  border: 1px solid var(--line);
  border-radius: 0.62rem;
  background: var(--surface);
  padding: 0.56rem 0.72rem;
  font-size: 0.88rem;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

a,
button,
input,
textarea {
  transition: color 0.18s ease, background-color 0.18s ease, border-color 0.18s ease, transform 0.18s ease;
}

@media (max-width: 1040px) {
  .site-header {
    grid-template-columns: auto 1fr;
    grid-template-areas:
      "brand controls"
      "nav nav";
  }

  .brand-wrap {
    grid-area: brand;
  }

  .control-cluster {
    grid-area: controls;
    justify-self: end;
  }

  .site-nav {
    grid-area: nav;
  }

  .site-nav ul {
    justify-content: flex-start;
  }

  .grid-3 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 780px) {
  .site-header {
    position: static;
    grid-template-columns: 1fr;
    grid-template-areas:
      "brand"
      "controls"
      "nav";
  }

  .control-cluster {
    justify-self: start;
  }

  .site-nav ul {
    flex-wrap: wrap;
    justify-content: flex-start;
  }

  .grid-3,
  .chip-groups,
  .field-row,
  .strip-list {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 560px) {
  .site-header,
  .page,
  .site-footer,
  .noscript-note {
    width: calc(100% - 1rem);
  }

  .card {
    padding: 0.94rem;
  }

  h1 {
    max-width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}