/* Arka website — one stylesheet, no external fonts or frameworks. */

:root {
  --accent: #f76b15;
  --accent-strong: #d9560a;
  --accent-soft: #fff1e8;
  --bg: #ffffff;
  --bg-2: #fafafa;
  --surface: #ffffff;
  --border: #e8e8eb;
  --border-2: #dadadf;
  --text: #18181b;
  --text-2: #52525b;
  --text-3: #6b6b76;
  --code-bg: #f4f4f5;
  --shadow: 0 1px 2px rgb(0 0 0 / 0.04), 0 8px 24px rgb(0 0 0 / 0.06);
  --radius: 10px;
  --radius-lg: 14px;
  --wrap: 1120px;
  --font: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --accent-soft: #2a1a10;
    --bg: #111113;
    --bg-2: #151518;
    --surface: #17171a;
    --border: #26262b;
    --border-2: #34343b;
    --text: #f4f4f5;
    --text-2: #b4b4bc;
    --text-3: #8c8c96;
    --code-bg: #1c1c20;
    --shadow: 0 1px 2px rgb(0 0 0 / 0.3), 0 8px 24px rgb(0 0 0 / 0.35);
    color-scheme: dark;
  }
}

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

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 var(--font);
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--accent-strong);
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}

@media (prefers-color-scheme: dark) {
  a {
    color: #ff8a3d;
  }
}

a:hover {
  text-decoration-thickness: 2px;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

h1,
h2,
h3 {
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin: 0 0 0.5em;
}

h1 {
  font-size: clamp(2rem, 5vw, 3.25rem);
  font-weight: 750;
}

h2 {
  font-size: clamp(1.5rem, 3vw, 2.1rem);
  font-weight: 700;
}

h3 {
  font-size: 1.1rem;
  font-weight: 650;
}

p {
  margin: 0 0 1em;
}

code,
pre {
  font-family: var(--mono);
  font-size: 0.9em;
}

code {
  background: var(--code-bg);
  padding: 0.12em 0.4em;
  border-radius: 5px;
}

pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 18px;
  overflow-x: auto;
  line-height: 1.55;
  margin: 0 0 1.25em;
}

pre code {
  background: none;
  padding: 0;
  font-size: 1em;
}

/* Grid and flex children may shrink below their content (long code lines
   scroll inside their box instead of widening the page). */
.split > *,
.grid > *,
.gallery > *,
.release > *,
.footer-grid > * {
  min-width: 0;
}

.wrap {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 20px;
}

.skip {
  position: absolute;
  left: -9999px;
}

.skip:focus {
  left: 16px;
  top: 12px;
  z-index: 10;
  background: var(--surface);
  padding: 8px 12px;
}

/* ── header ─────────────────────────────────────────────────────────── */

.site-header {
  position: sticky;
  top: 0;
  z-index: 5;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  text-decoration: none;
  font-weight: 750;
  font-size: 1.15rem;
  letter-spacing: -0.01em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav-links a:not(.btn) {
  color: var(--text-2);
  text-decoration: none;
  font-size: 0.95rem;
}

.nav-links a:not(.btn):hover {
  color: var(--text);
}

@media (max-width: 640px) {
  .nav-links .optional {
    display: none;
  }
  .nav-links {
    gap: 14px;
  }
}

/* ── buttons ────────────────────────────────────────────────────────── */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 20px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 1rem;
  text-decoration: none;
  border: 1px solid transparent;
  transition: background-color 0.15s, border-color 0.15s;
  white-space: nowrap;
}

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

.btn-primary:hover {
  background: var(--accent-strong);
}

.btn-secondary {
  background: var(--surface);
  color: var(--text);
  border-color: var(--border-2);
}

.btn-secondary:hover {
  border-color: var(--text-3);
}

.btn-sm {
  padding: 7px 14px;
  font-size: 0.9rem;
}

.btn small {
  font-weight: 500;
  opacity: 0.85;
}

/* ── hero ───────────────────────────────────────────────────────────── */

.hero {
  padding: 72px 0 40px;
  text-align: center;
}

.eyebrow {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent-strong);
  background: var(--accent-soft);
  padding: 4px 12px;
  border-radius: 999px;
  margin-bottom: 20px;
}

@media (prefers-color-scheme: dark) {
  .eyebrow {
    color: #ff9a55;
  }
}

.lead {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: var(--text-2);
  max-width: 720px;
  margin: 0 auto 32px;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
}

.fineprint {
  color: var(--text-3);
  font-size: 0.875rem;
  margin-top: 16px;
}

.shot {
  margin: 48px auto 0;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  overflow: hidden;
  background: var(--surface);
}

.shot img {
  width: 100%;
}

/* ── sections ───────────────────────────────────────────────────────── */

section {
  padding: 72px 0;
}

.section-alt {
  background: var(--bg-2);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.section-head {
  max-width: 680px;
  margin: 0 0 40px;
}

.section-head p {
  color: var(--text-2);
  font-size: 1.075rem;
}

.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-top: 56px;
}

.stats div {
  background: var(--surface);
  padding: 22px 20px;
  text-align: left;
}

.stats b {
  display: block;
  font-size: 1.15rem;
}

.stats span {
  color: var(--text-3);
  font-size: 0.9rem;
}

@media (max-width: 860px) {
  .stats {
    grid-template-columns: repeat(2, 1fr);
  }
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

@media (max-width: 900px) {
  .grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 600px) {
  .grid {
    grid-template-columns: 1fr;
  }
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
}

.card p {
  color: var(--text-2);
  margin: 0;
}

.card .icon {
  width: 36px;
  height: 36px;
  border-radius: 9px;
  background: var(--accent-soft);
  color: var(--accent);
  display: grid;
  place-items: center;
  margin-bottom: 14px;
}

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

@media (max-width: 900px) {
  .split {
    grid-template-columns: 1fr;
    gap: 28px;
  }
}

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

.checks li {
  position: relative;
  padding-left: 30px;
  margin-bottom: 14px;
  color: var(--text-2);
}

.checks li b {
  color: var(--text);
}

.checks li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.35em;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent-soft) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='none' stroke='%23f76b15' stroke-width='2.2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M4 8.5l2.5 2.5L12 5'/%3E%3C/svg%3E") center / 12px no-repeat;
}

.gallery {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

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

.gallery figure {
  margin: 0;
}

.gallery .shot {
  margin: 0 0 12px;
}

figcaption {
  color: var(--text-3);
  font-size: 0.9rem;
}

.cta {
  text-align: center;
}

.cta p {
  color: var(--text-2);
  font-size: 1.075rem;
  max-width: 560px;
  margin: 0 auto 28px;
}

/* ── download ───────────────────────────────────────────────────────── */

.release {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 24px;
  align-items: center;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow);
  margin-bottom: 48px;
}

@media (max-width: 700px) {
  .release {
    grid-template-columns: 1fr;
  }
}

.release h2 {
  margin: 0 0 6px;
}

.meta {
  color: var(--text-3);
  font-size: 0.95rem;
  margin: 0;
}

.hash {
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--text-3);
  word-break: break-all;
  margin-top: 10px;
}

.steps {
  counter-reset: step;
  list-style: none;
  padding: 0;
  margin: 0 0 2em;
}

.steps > li {
  counter-increment: step;
  position: relative;
  padding-left: 44px;
  margin-bottom: 22px;
}

.steps > li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 0;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-weight: 700;
  font-size: 0.9rem;
  display: grid;
  place-items: center;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 0 0 1.5em;
  font-size: 0.95rem;
}

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

th {
  font-weight: 600;
  color: var(--text-2);
  background: var(--bg-2);
}

/* ── documents (legal, download details) ────────────────────────────── */

.doc {
  max-width: 780px;
  padding: 56px 20px 80px;
  margin: 0 auto;
}

.doc h1 {
  font-size: clamp(1.9rem, 4vw, 2.5rem);
}

.doc h2 {
  font-size: 1.35rem;
  margin-top: 2em;
}

.doc h3 {
  margin-top: 1.5em;
}

.doc p,
.doc li {
  color: var(--text-2);
}

.doc li {
  margin-bottom: 0.4em;
}

.doc strong {
  color: var(--text);
}

.updated {
  color: var(--text-3);
  font-size: 0.95rem;
  margin-bottom: 2em;
}

.note {
  background: var(--accent-soft);
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 14px 18px;
  margin: 0 0 1.5em;
  color: var(--text);
}

.note p {
  color: var(--text);
  margin: 0;
}

.toc {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 20px;
  margin-bottom: 2em;
}

.toc ol {
  margin: 0;
  padding-left: 20px;
  columns: 2;
  column-gap: 32px;
}

@media (max-width: 600px) {
  .toc ol {
    columns: 1;
  }
}

.legal-list {
  list-style: none;
  padding: 0;
}

.legal-list li {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 20px;
  margin-bottom: 12px;
  background: var(--surface);
}

.legal-list a {
  font-weight: 600;
}

.legal-list p {
  margin: 4px 0 0;
  font-size: 0.95rem;
}

.small-table td:last-child {
  color: var(--text-3);
  white-space: nowrap;
}

/* ── footer ─────────────────────────────────────────────────────────── */

.site-footer {
  border-top: 1px solid var(--border);
  padding: 48px 0 32px;
  font-size: 0.925rem;
  color: var(--text-3);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 32px;
}

@media (max-width: 800px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.site-footer h4 {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-2);
  margin: 0 0 12px;
}

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

.site-footer li {
  margin-bottom: 8px;
}

.site-footer a {
  color: var(--text-3);
  text-decoration: none;
}

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

.copyright {
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px;
}