/*
 * tailnet-byok docs site.
 *
 * One stylesheet, no framework. The design brief was "a network tool read on a
 * phone": high contrast, generous line height, a monospace face for anything
 * the user might type, and a single accent colour reserved for states that mean
 * something (verified, warning, failure) rather than for decoration.
 *
 * Tokens are CSS custom properties so a fork can rebrand by editing the block
 * below and nothing else.
 */

:root {
  --bg: #0e1420;
  --bg-raised: #161d2c;
  --bg-code: #101725;
  --fg: #e6eaf1;
  --fg-muted: #97a3b8;
  --fg-faint: #64708a;
  --line: #26314a;
  --accent: #3ddc97;
  --accent-dim: #1fa271;
  --warn: #e8b339;
  --danger: #e0655f;
  --link: #8fb4d9;

  --font-sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, "Noto Sans SC", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas,
    "Liberation Mono", monospace;

  --measure: 46rem;
  --radius: 10px;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f6f8fb;
    --bg-raised: #ffffff;
    --bg-code: #eef2f7;
    --fg: #101725;
    --fg-muted: #4c5a72;
    --fg-faint: #7a8699;
    --line: #dbe2ec;
    --accent: #1fa271;
    --accent-dim: #17805a;
    --warn: #9a6b00;
    --danger: #b3261e;
    --link: #2f5d8a;
  }
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  * {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

/* --- Layout ------------------------------------------------------------- */

.wrap {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 0 1.25rem 6rem;
}

header.site {
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  position: sticky;
  top: 0;
  backdrop-filter: blur(8px);
  z-index: 10;
}

header.site .wrap {
  padding-top: 0.85rem;
  padding-bottom: 0.85rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.brand {
  font-weight: 650;
  letter-spacing: -0.01em;
  text-decoration: none;
  color: var(--fg);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.brand .dot {
  width: 0.6rem;
  height: 0.6rem;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 22%, transparent);
}

nav.site {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  font-size: 0.92rem;
  margin-left: auto;
}

nav.site a {
  color: var(--fg-muted);
  text-decoration: none;
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
}

nav.site a:hover,
nav.site a:focus-visible {
  color: var(--fg);
  border-bottom-color: var(--accent);
}

nav.site a[aria-current="page"] {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* --- Languages ----------------------------------------------------------- */

/* Every page carries both languages; one of them is hidden here rather than by
   the script, so the page still reads correctly if `lang.js` never loads. With
   no `data-lang` at all — a page opened with the script blocked — the English
   half is what a reader gets. */
html[data-lang="zh"] .i18n-en { display: none !important; }
html:not([data-lang="zh"]) .i18n-zh { display: none !important; }

button.lang {
  font: inherit;
  color: var(--fg-muted);
  background: none;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.05rem 0.6rem;
  cursor: pointer;
}

button.lang:hover,
button.lang:focus-visible {
  color: var(--fg);
  border-color: var(--accent);
}

/* --- Typography --------------------------------------------------------- */

h1 {
  font-size: clamp(1.75rem, 5vw, 2.5rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 2.5rem 0 0.75rem;
}

h2 {
  font-size: 1.3rem;
  letter-spacing: -0.01em;
  margin: 2.75rem 0 0.75rem;
  padding-top: 0.5rem;
}

h3 {
  font-size: 1.06rem;
  margin: 1.75rem 0 0.5rem;
}

p,
ul,
ol {
  margin: 0 0 1rem;
}

ul,
ol {
  padding-left: 1.4rem;
}

li {
  margin-bottom: 0.35rem;
}

li > ul,
li > ol {
  margin-top: 0.35rem;
}

a {
  color: var(--link);
  text-underline-offset: 3px;
}

a:hover {
  color: var(--accent);
}

strong {
  font-weight: 650;
}

hr {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 2.5rem 0;
}

.lead {
  font-size: 1.12rem;
  color: var(--fg-muted);
}

.muted {
  color: var(--fg-muted);
}

.small {
  font-size: 0.9rem;
}

/* --- Code --------------------------------------------------------------- */

code,
kbd,
pre {
  font-family: var(--font-mono);
  font-size: 0.875em;
}

code {
  background: var(--bg-code);
  border: 1px solid var(--line);
  border-radius: 5px;
  padding: 0.1em 0.35em;
  word-break: break-word;
}

pre {
  background: var(--bg-code);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1rem;
  overflow-x: auto;
  line-height: 1.55;
  margin: 0 0 1.25rem;
}

pre code {
  background: none;
  border: 0;
  padding: 0;
  font-size: 0.83rem;
  white-space: pre;
  word-break: normal;
}

kbd {
  background: var(--bg-raised);
  border: 1px solid var(--line);
  border-bottom-width: 2px;
  border-radius: 5px;
  padding: 0.1em 0.4em;
}

/* --- Cards and callouts ------------------------------------------------- */

.card {
  background: var(--bg-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.15rem 1.25rem;
  margin: 0 0 1.25rem;
}

.card > :last-child {
  margin-bottom: 0;
}

.grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
  margin-bottom: 1.5rem;
}

.grid .card {
  margin: 0;
}

.callout {
  border-left: 3px solid var(--accent);
  background: color-mix(in srgb, var(--accent) 7%, var(--bg-raised));
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 0.9rem 1.1rem;
  margin: 0 0 1.25rem;
}

.callout.warn {
  border-left-color: var(--warn);
  background: color-mix(in srgb, var(--warn) 8%, var(--bg-raised));
}

.callout.danger {
  border-left-color: var(--danger);
  background: color-mix(in srgb, var(--danger) 8%, var(--bg-raised));
}

.callout > :last-child {
  margin-bottom: 0;
}

.callout .label {
  display: block;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--fg-muted);
  margin-bottom: 0.35rem;
}

/* --- Status markers ----------------------------------------------------- */

.tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  border: 1px solid currentColor;
  vertical-align: middle;
}

.tag.ok {
  color: var(--accent);
}
.tag.warn {
  color: var(--warn);
}
.tag.bad {
  color: var(--danger);
}
.tag.neutral {
  color: var(--fg-muted);
}

/* A terminal transcript, for the connection-test output. */
.transcript {
  background: var(--bg-code);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1rem;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.7;
  overflow-x: auto;
  margin: 0 0 1.25rem;
}

.transcript .ok {
  color: var(--accent);
}
.transcript .warn {
  color: var(--warn);
}
.transcript .bad {
  color: var(--danger);
}
.transcript .dim {
  color: var(--fg-faint);
}
.transcript .step {
  display: inline-block;
  min-width: 15rem;
}

/* --- Tables ------------------------------------------------------------- */

.table-scroll {
  overflow-x: auto;
  margin: 0 0 1.5rem;
}

table {
  border-collapse: collapse;
  width: 100%;
  font-size: 0.92rem;
}

th,
td {
  text-align: left;
  padding: 0.55rem 0.7rem;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

th {
  font-weight: 650;
  color: var(--fg-muted);
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  white-space: nowrap;
}

tbody tr:last-child td {
  border-bottom: 0;
}

/* --- Diagram ------------------------------------------------------------ */

.diagram {
  background: var(--bg-code);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1rem;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  line-height: 1.5;
  white-space: pre;
  color: var(--fg-muted);
  margin: 0 0 1.25rem;
}

/* --- Header block ------------------------------------------------------- */

.hero {
  padding-top: 1rem;
}

.hero .badges {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
  margin: 0 0 1rem;
}

.hero .badges img {
  height: 20px;
}

.cta {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin: 1.5rem 0 2rem;
}

.btn {
  display: inline-block;
  padding: 0.6rem 1.1rem;
  border-radius: var(--radius);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid var(--line);
  color: var(--fg);
  background: var(--bg-raised);
}

.btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.btn.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #07231a;
}

.btn.primary:hover {
  background: var(--accent-dim);
  border-color: var(--accent-dim);
  color: #04170f;
}

/* --- Footer ------------------------------------------------------------- */

footer.site {
  border-top: 1px solid var(--line);
  margin-top: 4rem;
  padding: 2rem 0 3rem;
  color: var(--fg-muted);
  font-size: 0.88rem;
}

footer.site .wrap {
  padding-bottom: 0;
}

footer.site a {
  color: var(--fg-muted);
}

/* --- Anchor links ------------------------------------------------------- */

h2 .anchor,
h3 .anchor {
  color: var(--fg-faint);
  text-decoration: none;
  margin-left: 0.4rem;
  opacity: 0;
  transition: opacity 0.12s ease;
}

h2:hover .anchor,
h3:hover .anchor,
h2 .anchor:focus-visible,
h3 .anchor:focus-visible {
  opacity: 1;
}

/* --- Print -------------------------------------------------------------- */

@media print {
  header.site,
  footer.site,
  .cta {
    display: none;
  }
  body {
    background: #fff;
    color: #000;
    font-size: 11pt;
  }
  pre,
  .card,
  .transcript,
  .diagram {
    border-color: #bbb;
    background: #f6f6f6;
  }
  a {
    color: #000;
    text-decoration: underline;
  }
}