/*
  Auri Guides — longform reading surface on Voice design tokens.
*/

:root {
  color-scheme: light dark;
  --page: #d8dcdf;
  --page-soft: #e4e7e9;
  --surface: #edf0f1;
  --shell: #c3c8cc;
  --ink: #17191c;
  --muted: #4d535a;
  --quiet: #5a6168;
  --accent: #b84338;
  --accent-hover: #a83930;
  --accent-ink: #fffaf8;
  --focus: #94362f;
  --nav: rgb(229 232 234 / 84%);
  --nav-edge: rgb(255 255 255 / 64%);
  --edge: rgb(255 255 255 / 52%);
  --shade: rgb(62 70 76 / 14%);
  --layer-nav: 20;
  --layer-skip: 30;
  --ease-out: cubic-bezier(0.32, 0.72, 0, 1);
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", system-ui, sans-serif;
  --prose: 42rem;
  --shell-width: 1120px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --page: #111315;
    --page-soft: #15181a;
    --surface: #1a1d20;
    --shell: #292d31;
    --ink: #f3f4f5;
    --muted: #bdc1c5;
    --quiet: #9ca2a8;
    --accent: #df675b;
    --accent-hover: #ed7568;
    --accent-ink: #17191b;
    --focus: #ff8a7e;
    --nav: rgb(23 26 29 / 84%);
    --nav-edge: rgb(255 255 255 / 13%);
    --edge: rgb(255 255 255 / 10%);
    --shade: rgb(0 0 0 / 26%);
  }
}

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

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

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(1200px 480px at 12% -10%, rgb(184 67 56 / 10%), transparent 55%),
    radial-gradient(900px 420px at 88% 0%, rgb(62 70 76 / 10%), transparent 50%),
    var(--page);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.55;
  font-synthesis: none;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

img {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
}

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 4px;
}

#main:focus {
  outline: none;
}

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

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: var(--layer-skip);
  padding: 10px 14px;
  border-radius: 999px;
  background: var(--ink);
  color: var(--page);
  font-size: 14px;
  font-weight: 600;
  transform: translateY(-160%);
  transition: transform 220ms var(--ease-out);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  position: fixed;
  top: 18px;
  left: 0;
  z-index: var(--layer-nav);
  width: 100%;
  pointer-events: none;
}

.nav-shell {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  width: min(var(--shell-width), calc(100% - 40px));
  min-height: 64px;
  margin-inline: auto;
  padding: 6px 7px 6px 20px;
  border: 1px solid var(--nav-edge);
  border-radius: 999px;
  background: var(--nav);
  box-shadow:
    inset 0 1px 0 var(--edge),
    0 10px 26px var(--shade);
  backdrop-filter: blur(18px) saturate(130%);
  -webkit-backdrop-filter: blur(18px) saturate(130%);
  pointer-events: auto;
}

.brand {
  display: inline-flex;
  align-items: center;
  justify-self: start;
  gap: 10px;
  width: max-content;
  font-size: 15px;
  font-weight: 650;
  letter-spacing: -0.02em;
  white-space: nowrap;
}

.brand-mark {
  width: 36px;
  height: 36px;
  border-radius: 9px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  font-size: 14px;
  font-weight: 540;
  color: var(--muted);
}

.nav-links a,
.footer-links a,
.guide-prose a,
.breadcrumb a {
  transition: color 220ms var(--ease-out);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 52px;
  width: max-content;
  padding: 0 24px;
  border: 0;
  border-radius: 999px;
  color: var(--accent-ink);
  background: var(--accent);
  box-shadow:
    inset 0 1px 0 rgb(255 255 255 / 24%),
    0 3px 4px rgb(91 36 31 / 12%);
  font-size: 15px;
  font-weight: 680;
  line-height: 1;
  white-space: nowrap;
  cursor: pointer;
  transition:
    background-color 220ms var(--ease-out),
    transform 220ms var(--ease-out),
    box-shadow 220ms var(--ease-out);
}

.button:active {
  transform: scale(0.98);
}

.button-secondary {
  color: var(--ink);
  background: var(--surface);
  box-shadow:
    inset 0 1px 0 var(--edge),
    0 2px 6px var(--shade);
}

.button-nav {
  justify-self: end;
  min-height: 50px;
  padding-inline: 22px;
}

@media (hover: hover) and (pointer: fine) {
  .nav-links a:hover,
  .footer-links a:hover,
  .guide-prose a:hover,
  .breadcrumb a:hover,
  .guide-card:hover .guide-card-title {
    color: var(--ink);
  }

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

  .button-secondary:hover {
    background: var(--page-soft);
  }

  .guide-card:hover {
    transform: translateY(-2px);
    box-shadow:
      inset 0 1px 0 var(--edge),
      0 14px 28px var(--shade);
  }
}

.site-footer {
  padding: 72px 0 44px;
  background: transparent;
}

.footer-shell {
  display: grid;
  grid-template-columns: minmax(220px, 0.8fr) minmax(0, 1.2fr);
  align-items: start;
  gap: 64px;
  width: min(var(--shell-width), calc(100% - 64px));
  margin-inline: auto;
}

.footer-brand p,
.copyright {
  margin: 12px 0 0;
  color: var(--quiet);
  font-size: 13px;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-start;
  gap: 12px 28px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 530;
}

.copyright {
  grid-column: 1 / -1;
  margin-top: 20px;
}

.guides-shell {
  width: min(var(--shell-width), calc(100% - 48px));
  margin-inline: auto;
}

.guides-hero {
  padding: 148px 0 56px;
}

.guides-hero h1 {
  margin: 0;
  max-width: 18ch;
  font-size: clamp(2.4rem, 5vw, 3.6rem);
  font-weight: 700;
  letter-spacing: -0.045em;
  line-height: 1.05;
}

.guides-lede {
  max-width: 40rem;
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 1.125rem;
  line-height: 1.55;
}

.guides-meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 14px;
  margin-top: 28px;
}

.chip {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 0 14px;
  border: 1px solid var(--nav-edge);
  border-radius: 999px;
  background: rgb(237 240 241 / 55%);
  color: var(--muted);
  font-size: 13px;
  font-weight: 560;
}

@media (prefers-color-scheme: dark) {
  .chip {
    background: rgb(26 29 32 / 72%);
  }
}

.theme-block {
  padding: 28px 0 12px;
}

.theme-block + .theme-block {
  border-top: 1px solid var(--nav-edge);
  margin-top: 20px;
}

.theme-heading {
  margin: 0 0 8px;
  font-size: 1.35rem;
  font-weight: 680;
  letter-spacing: -0.03em;
}

.theme-note {
  margin: 0 0 22px;
  color: var(--quiet);
  font-size: 0.95rem;
}

.guide-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
}

.guide-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-height: 100%;
  padding: 22px 22px 20px;
  border: 1px solid var(--nav-edge);
  border-radius: 24px;
  background: rgb(237 240 241 / 72%);
  box-shadow:
    inset 0 1px 0 var(--edge),
    0 8px 20px var(--shade);
  transition:
    transform 220ms var(--ease-out),
    box-shadow 220ms var(--ease-out);
}

@media (prefers-color-scheme: dark) {
  .guide-card {
    background: rgb(26 29 32 / 78%);
  }
}

.guide-card-top {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.badge {
  display: inline-flex;
  align-items: center;
  min-height: 26px;
  padding: 0 10px;
  border-radius: 999px;
  background: var(--shell);
  color: var(--muted);
  font-size: 12px;
  font-weight: 600;
}

.badge-voice {
  background: rgb(184 67 56 / 14%);
  color: var(--accent);
}

.badge-keyboard {
  background: rgb(62 70 76 / 14%);
  color: var(--muted);
}

.guide-card-title {
  margin: 0;
  font-size: 1.1rem;
  font-weight: 650;
  letter-spacing: -0.025em;
  line-height: 1.3;
  transition: color 220ms var(--ease-out);
}

.guide-card-blurb {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.5;
  flex: 1;
}

.guide-card-meta {
  margin: 0;
  color: var(--quiet);
  font-size: 13px;
}

.guides-cta-band {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 24px;
  margin: 56px 0 24px;
  padding: 28px;
  border: 1px solid var(--nav-edge);
  border-radius: 28px;
  background: rgb(237 240 241 / 60%);
}

@media (prefers-color-scheme: dark) {
  .guides-cta-band {
    background: rgb(26 29 32 / 70%);
  }
}

.guides-cta-band h2 {
  margin: 0 0 10px;
  font-size: 1.4rem;
  letter-spacing: -0.03em;
}

.guides-cta-band p {
  margin: 0;
  color: var(--muted);
}

.guides-cta-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: 12px;
}

.article-header {
  padding: 132px 0 28px;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 22px;
  color: var(--quiet);
  font-size: 13px;
}

.breadcrumb span[aria-hidden="true"] {
  opacity: 0.55;
}

.article-header h1 {
  margin: 0;
  max-width: 18ch;
  font-size: clamp(2rem, 4.4vw, 3rem);
  font-weight: 720;
  letter-spacing: -0.04em;
  line-height: 1.08;
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 16px;
  margin-top: 18px;
  color: var(--quiet);
  font-size: 13px;
}

.answer-box {
  max-width: var(--prose);
  margin: 8px 0 36px;
  padding: 22px 24px;
  border: 1px solid var(--nav-edge);
  border-radius: 24px;
  background: rgb(237 240 241 / 78%);
  box-shadow: inset 0 1px 0 var(--edge);
}

@media (prefers-color-scheme: dark) {
  .answer-box {
    background: rgb(26 29 32 / 82%);
  }
}

.answer-label {
  margin: 0 0 8px;
  color: var(--accent);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.answer-box p {
  margin: 0;
  font-size: 1.05rem;
  line-height: 1.55;
}

.article-layout {
  display: grid;
  grid-template-columns: minmax(0, var(--prose)) minmax(180px, 220px);
  gap: 48px;
  align-items: start;
  padding-bottom: 40px;
}

.article-column {
  max-width: var(--prose);
}

.toc {
  position: sticky;
  top: 104px;
  padding: 16px 0;
}

.toc h2 {
  margin: 0 0 12px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--quiet);
}

.toc ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

.toc li + li {
  margin-top: 8px;
}

.toc a {
  color: var(--muted);
  font-size: 13px;
  line-height: 1.35;
}

.guide-prose {
  max-width: var(--prose);
}

.guide-prose > h2 {
  margin: 2.2rem 0 0.85rem;
  font-size: 1.45rem;
  font-weight: 680;
  letter-spacing: -0.03em;
  line-height: 1.25;
  scroll-margin-top: 110px;
}

.guide-prose > h3 {
  margin: 1.5rem 0 0.6rem;
  font-size: 1.1rem;
  font-weight: 650;
  letter-spacing: -0.02em;
}

.guide-prose p,
.guide-prose li {
  color: var(--ink);
  font-size: 1.02rem;
  line-height: 1.65;
}

.guide-prose p {
  margin: 0 0 1rem;
}

.guide-prose a:not(.button) {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.15em;
}

.guide-prose a.button {
  color: var(--accent-ink);
  text-decoration: none;
}

.guide-prose a.button-secondary {
  color: var(--ink);
  text-decoration: none;
}

.guide-prose ul,
.guide-prose ol {
  margin: 0 0 1.1rem;
  padding-left: 1.25rem;
}

.guide-prose li + li {
  margin-top: 0.4rem;
}

.guide-prose table {
  width: 100%;
  margin: 0 0 1.4rem;
  border-collapse: collapse;
  font-size: 0.95rem;
}

.guide-prose th,
.guide-prose td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--nav-edge);
  text-align: left;
  vertical-align: top;
}

.guide-prose th {
  color: var(--quiet);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.faq-list {
  display: grid;
  gap: 14px;
  margin: 0 0 1.5rem;
}

.faq-item {
  padding: 16px 18px;
  border: 1px solid var(--nav-edge);
  border-radius: 18px;
  background: rgb(237 240 241 / 55%);
}

@media (prefers-color-scheme: dark) {
  .faq-item {
    background: rgb(26 29 32 / 70%);
  }
}

.faq-item h3 {
  margin: 0 0 8px;
  font-size: 1rem;
  font-weight: 650;
}

.faq-item p {
  margin: 0;
  color: var(--muted);
}

.soft-cta {
  margin: 2rem 0;
  padding: 22px 24px;
  border-radius: 24px;
  border: 1px solid var(--nav-edge);
  background: rgb(184 67 56 / 8%);
}

.soft-cta p {
  margin: 0 0 14px;
}

.soft-cta .button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.soft-cta a.button {
  color: var(--accent-ink);
  text-decoration: none;
}

.soft-cta a.button-secondary {
  color: var(--ink);
  text-decoration: none;
}

.related {
  margin: 2.5rem 0 1rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--nav-edge);
}

.related h2 {
  margin: 0 0 14px;
  font-size: 1.15rem;
}

.related ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.related li + li {
  margin-top: 10px;
}

.related a {
  color: var(--accent);
  font-weight: 560;
}

@media (max-width: 900px) {
  .article-layout {
    grid-template-columns: 1fr;
  }

  .toc {
    position: static;
    padding: 0 0 18px;
  }

  .guides-cta-band {
    grid-template-columns: 1fr;
  }

  .guides-cta-actions {
    justify-content: flex-start;
  }
}

@media (max-width: 720px) {
  .nav-shell {
    grid-template-columns: 1fr auto;
    width: min(100% - 24px, var(--shell-width));
    padding: 6px 6px 6px 14px;
  }

  .nav-links {
    display: none;
  }

  .guides-shell,
  .footer-shell {
    width: min(100% - 28px, var(--shell-width));
  }

  .guides-hero {
    padding-top: 120px;
  }

  .article-header {
    padding-top: 112px;
  }

  .footer-shell {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .guides-cta-band,
  .answer-box,
  .soft-cta,
  .guide-card {
    border-radius: 20px;
  }
}

@media (prefers-reduced-motion: no-preference) {
  .nav-shell {
    animation: nav-settle 800ms var(--ease-out) both;
  }

  .guide-card {
    animation: settle-in both var(--ease-out);
    animation-timeline: view();
    animation-range: entry 5% cover 40%;
  }
}

@keyframes nav-settle {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes settle-in {
  from {
    opacity: 0.35;
    transform: translateY(14px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}