/* styles.css — shared design tokens & components for the httpbin site */
/* All pages must use these tokens; no per-page palettes or fonts. */

:root {
  --color-canvas: #ffffff;
  --color-ink: #3b4151;
  --color-ink-soft: #6b7280;
  --color-ink-mute: #9aa2b1;
  --color-accent: #4169e1;
  --color-accent-dark: #2c52c6;
  --color-underline: #3a7bd5;
  --color-divider: #ebebeb;
  --color-code-bg: #292b36;
  --color-code-ink: #f5f7fa;
  --color-badge-bg: #eef1f6;
  --color-get: #49cc90;
  --color-post: #f93e3e;
  --color-put: #3c83f4;
  --color-patch: #a567f0;
  --color-delete: #f0533c;
  --color-head: #2c303b;
  --color-focus: #2c52c6;

  --font-display: "Titillium Web", "Trebuchet MS", sans-serif;
  --font-body: "Open Sans", "Segoe UI", Helvetica, Arial, sans-serif;
  --font-code: "Source Code Pro", "SFMono-Regular", Consolas, monospace;

  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-md: 1.125rem;
  --text-lg: 1.375rem;
  --text-xl: 1.75rem;
  --text-2xl: 2.25rem;
  --text-3xl: 2.75rem;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 4rem;

  --radius-sm: 3px;
  --radius-md: 6px;
  --radius-lg: 10px;

  --shadow-sm: 0 1px 2px rgba(20, 24, 33, 0.08);
  --shadow-md: 0 4px 14px rgba(20, 24, 33, 0.12);

  --header-height: 3.5rem;
  --content-width: 68rem;
  --transition: 0.18s ease;
}

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

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

body {
  margin: 0;
  background: var(--color-canvas);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.6;
  overflow-x: hidden;
}

img,
svg {
  max-width: 100%;
  height: auto;
}

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

a:hover,
a:focus-visible {
  text-decoration: underline;
}

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

h1,
h2,
h3,
h4 {
  font-family: var(--font-display);
  color: var(--color-head);
  line-height: 1.25;
  margin: 0 0 var(--space-3);
}

h1 { font-size: var(--text-3xl); }
h2 { font-size: var(--text-xl); }
h3 { font-size: var(--text-lg); }
h4 { font-size: var(--text-md); }

p { margin: 0 0 var(--space-4); }

code,
kbd,
samp,
pre {
  font-family: var(--font-code);
}

/* ---------- Layout ---------- */
.container {
  width: 100%;
  max-width: var(--content-width);
  margin-inline: auto;
  padding-inline: var(--space-4);
}

.site-main {
  padding-block: var(--space-6) var(--space-8);
}

.section {
  margin-block: var(--space-7);
}

.section-divider {
  border: 0;
  border-top: 1px solid var(--color-divider);
  margin: var(--space-7) 0;
}

.grid {
  display: grid;
  gap: var(--space-4);
}

@media (min-width: 48rem) {
  .grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

.grid--split {
  display: grid;
  gap: var(--space-4);
  grid-template-columns: minmax(0, 1fr);
}

@media (min-width: 48rem) {
  .grid--split { grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr); }
}

/* ---------- Header / Nav (shared chrome) ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-head);
  color: var(--color-canvas);
  box-shadow: var(--shadow-md);
}

.site-header__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  min-height: var(--header-height);
  padding-block: var(--space-2);
}

.site-logo {
  font-family: var(--font-display);
  font-size: var(--text-md);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--color-canvas);
  text-decoration: none;
  white-space: nowrap;
}

.site-logo:hover,
.site-logo:focus-visible {
  color: var(--color-canvas);
  text-decoration: none;
  opacity: 0.85;
}

.site-logo__version {
  display: inline-block;
  margin-left: var(--space-2);
  padding: 0 var(--space-2);
  border: 1px solid rgba(255, 255, 255, 0.35);
  border-radius: var(--radius-sm);
  font-family: var(--font-code);
  font-size: var(--text-xs);
  font-weight: 400;
  vertical-align: middle;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2) var(--space-4);
  /* Nav is always visible at every width: links wrap below the logo
     on narrow screens instead of hiding behind a toggle. */
}

.site-nav__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2) var(--space-4);
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-nav__link {
  display: inline-block;
  padding: var(--space-1) 0;
  color: var(--color-canvas);
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  border-bottom: 2px solid transparent;
  transition: border-color var(--transition), opacity var(--transition);
}

.site-nav__link:hover,
.site-nav__link:focus-visible {
  color: var(--color-canvas);
  text-decoration: none;
  border-bottom-color: var(--color-accent);
  opacity: 0.9;
}

.site-nav__link--external {
  border: 1px solid rgba(255, 255, 255, 0.35);
  border-bottom-color: rgba(255, 255, 255, 0.35);
  border-radius: var(--radius-sm);
  padding: var(--space-1) var(--space-3);
}

.site-nav__link--external:hover,
.site-nav__link--external:focus-visible {
  border-color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

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

.site-nav__toggle {
  display: none;
}

@media (max-width: 40rem) {
  .site-header__inner {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-2);
  }

  .site-nav,
  .site-nav__list {
    width: 100%;
    gap: var(--space-2) var(--space-3);
  }
}

/* ---------- Footer (shared chrome) ---------- */
.site-footer {
  border-top: 1px solid var(--color-divider);
  background: #f8f9fa;
  color: var(--color-ink-soft);
  font-size: var(--text-sm);
  margin-top: var(--space-8);
}

.site-footer__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding-block: var(--space-5);
}

.site-footer__meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-4);
  margin: 0;
}

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

.site-footer__note {
  margin: 0;
}

/* ---------- Identity block ---------- */
.identity {
  padding-block: var(--space-6) var(--space-4);
  border-bottom: 1px solid var(--color-divider);
}

.identity__title {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-2);
}

.identity__tagline {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  color: var(--color-ink-soft);
  margin-bottom: var(--space-4);
}

.badge {
  display: inline-block;
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  background: var(--color-badge-bg);
  color: var(--color-ink);
  font-family: var(--font-code);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.02em;
}

.base-url {
  font-family: var(--font-code);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}

.attribution {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-5);
  padding-block: var(--space-4);
  border-bottom: 1px solid var(--color-divider);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}

.attribution__item {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}

/* ---------- Code blocks & JSON viewer ---------- */
.code-block {
  position: relative;
  display: block;
  margin: var(--space-3) 0;
  padding: var(--space-4);
  overflow-x: auto;
  background: var(--color-code-bg);
  color: var(--color-code-ink);
  border-radius: var(--radius-md);
  font-family: var(--font-code);
  font-size: var(--text-sm);
  line-height: 1.55;
  white-space: pre-wrap;
  word-break: break-word;
}

.json-viewer {
  display: block;
  margin: 0;
  padding: var(--space-4);
  overflow-x: auto;
  background: var(--color-code-bg);
  color: var(--color-code-ink);
  border-radius: var(--radius-md);
  font-family: var(--font-code);
  font-size: var(--text-sm);
  line-height: 1.55;
  white-space: pre-wrap;
  word-break: break-word;
  max-height: 22rem;
}

.json-viewer__status {
  display: block;
  margin-bottom: var(--space-2);
  color: var(--color-get);
  font-family: var(--font-code);
  font-size: var(--text-xs);
}

/* ---------- Method chips ---------- */
.method {
  display: inline-block;
  min-width: 4.25rem;
  padding: 0.15rem var(--space-2);
  border-radius: var(--radius-sm);
  color: #fff;
  font-family: var(--font-code);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.04em;
  text-align: center;
  text-transform: uppercase;
}

.method-get    { background: var(--color-get); }
.method-post   { background: var(--color-post); }
.method-put    { background: var(--color-put); }
.method-patch  { background: var(--color-patch); }
.method-delete { background: var(--color-delete); }
.method-head,
.method-options { background: var(--color-ink-mute); }

/* ---------- Cards & accordion ---------- */
.card {
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-lg);
  background: var(--color-canvas);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.card + .card {
  margin-top: var(--space-4);
}

.card__header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-5);
  background: #f8f9fa;
  border-bottom: 1px solid var(--color-divider);
}

.card__title {
  margin: 0;
  font-size: var(--text-lg);
}

.card__subtitle {
  margin: var(--space-1) 0 0;
  color: var(--color-ink-soft);
  font-size: var(--text-sm);
}

.card__body {
  padding: var(--space-2) var(--space-5) var(--space-4);
}

.accordion__item {
  border-top: 1px solid var(--color-divider);
  padding: var(--space-3) 0;
}

.accordion__item:first-child {
  border-top: 0;
}

.endpoint {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-2) var(--space-3);
}

.endpoint__path {
  font-family: var(--font-code);
  font-size: var(--text-sm);
  color: var(--color-head);
  word-break: break-all;
}

.endpoint__desc {
  flex: 1 1 12rem;
  margin: 0;
  color: var(--color-ink-soft);
  font-size: var(--text-sm);
}

.endpoint__actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-left: auto;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  background: var(--color-badge-bg);
  color: var(--color-ink);
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: background var(--transition), color var(--transition),
    border-color var(--transition), transform var(--transition);
}

.btn:hover,
.btn:focus-visible {
  background: var(--color-divider);
  text-decoration: none;
}

.btn:active {
  transform: translateY(1px);
}

.btn-accent {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: #fff;
}

.btn-accent:hover,
.btn-accent:focus-visible {
  background: var(--color-accent-dark);
  border-color: var(--color-accent-dark);
  color: #fff;
}

.btn-ghost {
  background: transparent;
  border-color: var(--color-divider);
}

/* ---------- Try-it-out expander ---------- */
.tryit {
  margin-top: var(--space-2);
}

.tryit > summary {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-3);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-md);
  background: var(--color-canvas);
  color: var(--color-accent);
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  transition: border-color var(--transition), background var(--transition);
}

.tryit > summary::-webkit-details-marker {
  display: none;
}

.tryit > summary::before {
  content: "\25B8"; /* ▸ */
  font-size: 0.85em;
  transition: transform var(--transition);
}

.tryit[open] > summary::before {
  transform: rotate(90deg);
}

.tryit > summary:hover,
.tryit > summary:focus-visible {
  border-color: var(--color-accent);
  background: var(--color-badge-bg);
}

.tryit__pane {
  display: grid;
  gap: var(--space-3);
  margin-top: var(--space-3);
  padding: var(--space-3);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-md);
  background: #f8f9fa;
  grid-template-columns: minmax(0, 1fr);
}

@media (min-width: 48rem) {
  .tryit__pane {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: start;
  }
}

.tryit__col {
  min-width: 0;
}

.tryit__label {
  margin: 0 0 var(--space-2);
  font-family: var(--font-display);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-ink-soft);
}

.tryit__controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3);
  margin-top: var(--space-3);
}

/* ---------- Forms ---------- */
.form {
  display: grid;
  gap: var(--space-4);
  grid-template-columns: minmax(0, 1fr);
}

@media (min-width: 40rem) {
  .form--inline {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    align-items: end;
  }
}

.field {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  min-width: 0;
}

.field__label {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-head);
}

.input,
.field input,
.field textarea,
.field select {
  width: 100%;
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-md);
  background: var(--color-canvas);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.input:hover,
.field input:hover,
.field textarea:hover {
  border-color: var(--color-ink-mute);
}

.input:focus,
.field input:focus,
.field textarea:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(65, 105, 225, 0.18);
  outline: none;
}

.field__hint {
  font-size: var(--text-xs);
  color: var(--color-ink-mute);
}

/* ---------- Motion: rotation, blinker, shake, scaleUp + reveal ---------- */
.reveal {
  opacity: 0;
  transform: translateY(0.75rem);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.reveal.is-visible,
.reveal--shown {
  opacity: 1;
  transform: none;
}

.rotate {
  display: inline-block;
  animation: rotation 2s linear infinite;
}

@keyframes rotation {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}

.blinker {
  animation: blinker 1s steps(2, start) infinite;
}

@keyframes blinker {
  0%   { opacity: 1; }
  50%  { opacity: 0; }
  100% { opacity: 1; }
}

.shake {
  animation: shake 0.4s ease-in-out;
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20%      { transform: translateX(-0.35rem); }
  40%      { transform: translateX(0.35rem); }
  60%      { transform: translateX(-0.25rem); }
  80%      { transform: translateX(0.25rem); }
}

.scale-up {
  animation: scaleUp 0.35s ease both;
}

@keyframes scaleUp {
  from { opacity: 0; transform: scale(0.92); }
  to   { opacity: 1; transform: scale(1); }
}

.spinner {
  display: inline-block;
  width: 1.1em;
  height: 1.1em;
  border: 2px solid currentColor;
  border-top-color: transparent;
  border-radius: 50%;
  animation: rotation 0.8s linear infinite;
  vertical-align: -0.15em;
}

.is-shaking { animation: shake 0.4s ease-in-out; }

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

  *,
  *::before,
  *::after {
    animation-duration: 0.001s !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001s !important;
    scroll-behavior: auto !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}

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

.text-muted { color: var(--color-ink-soft); }
.text-small { font-size: var(--text-sm); }
.text-center { text-align: center; }

.stack > * + * { margin-top: var(--space-4); }
.stack-sm > * + * { margin-top: var(--space-2); }

.skip-link {
  position: absolute;
  left: var(--space-2);
  top: -100%;
  z-index: 200;
  padding: var(--space-2) var(--space-3);
  background: var(--color-canvas);
  color: var(--color-head);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-md);
}

.skip-link:focus {
  top: var(--space-2);
}