/* AirLink VPN — main stylesheet
   Palette: clean dark gray + white. No external dependencies. */

:root {
  --ink: #1d2125;
  --ink-2: #2b2f33;
  --gray-700: #3a4047;
  --gray-600: #545b63;
  --gray-500: #6b7280;
  --gray-400: #9aa1a9;
  --gray-300: #cbd0d6;
  --gray-200: #e4e7ea;
  --gray-100: #f1f3f5;
  --gray-50: #f8f9fa;
  --white: #ffffff;
  --accent: #2b2f33;
  --accent-hover: #14181b;
  --border: #e4e7ea;
  --ok: #2f7d4f;
  --warn: #8a6d1f;
  --radius: 10px;
  --radius-lg: 16px;
  --maxw: 1080px;
  --shadow-sm: 0 1px 2px rgba(16, 19, 22, .06);
  --shadow: 0 4px 16px rgba(16, 19, 22, .08);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, "Inter", sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.65;
  color: var(--ink);
  background: var(--white);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 { color: var(--ink); line-height: 1.2; letter-spacing: -0.01em; font-weight: 700; }
h1 { font-size: 2.6rem; margin: 0 0 .5em; }
h2 { font-size: 1.9rem; margin: 0 0 .6em; }
h3 { font-size: 1.25rem; margin: 0 0 .4em; }
p { margin: 0 0 1em; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
ul, ol { margin: 0 0 1em; padding-left: 1.3em; }
li { margin: .3em 0; }
small { color: var(--gray-500); }
code, kbd { font-family: var(--mono); font-size: .9em; background: var(--gray-100); padding: .12em .4em; border-radius: 5px; }

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.narrow { max-width: 760px; }

/* ---------- Header / Nav ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,.92);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--border);
}
.nav { display: flex; align-items: center; gap: 24px; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 1.15rem; color: var(--ink); }
.brand:hover { text-decoration: none; }
.brand svg { width: 26px; height: 22px; color: var(--ink); }
.nav-links { display: flex; align-items: center; gap: 4px; margin-left: auto; }
.nav-links a {
  color: var(--gray-600); font-weight: 500; font-size: .98rem;
  padding: 8px 12px; border-radius: 8px;
}
.nav-links a:hover { color: var(--ink); background: var(--gray-100); text-decoration: none; }
.nav-links a.active { color: var(--ink); }

.nav-links a.nav-cta { background: var(--accent); color: var(--white); font-weight: 600; padding: 8px 16px; }
.nav-links a.nav-cta:hover { background: var(--accent-hover); color: var(--white); }

/* Language dropdown */
.lang { position: relative; margin-left: 8px; }
.lang > summary { list-style: none; display: flex; align-items: center; gap: 6px; cursor: pointer; padding: 6px 10px; border: 1px solid var(--border); border-radius: 8px; font-size: .85rem; font-weight: 600; color: var(--gray-600); user-select: none; }
.lang > summary::-webkit-details-marker { display: none; }
.lang > summary::marker { content: ""; }
.lang > summary:hover { color: var(--ink); border-color: var(--gray-300); }
.lang .flag { font-size: 1.05rem; line-height: 1; }
.lang .chev { width: 12px; height: 12px; color: var(--gray-400); transition: transform .15s; }
.lang[open] > summary .chev { transform: rotate(180deg); }
.lang-menu { position: absolute; right: 0; top: calc(100% + 6px); min-width: 200px; background: var(--white); border: 1px solid var(--border); border-radius: 12px; box-shadow: var(--shadow); padding: 6px; display: flex; flex-direction: column; z-index: 60; }
.lang-menu a { display: flex; align-items: center; gap: 10px; padding: 9px 10px; border-radius: 8px; font-size: .92rem; font-weight: 500; color: var(--gray-700); white-space: nowrap; }
.lang-menu a:hover { background: var(--gray-100); color: var(--ink); text-decoration: none; }
.lang-menu a.active { color: var(--ink); font-weight: 600; }

.nav-toggle { display: none; margin-left: auto; background: none; border: 1px solid var(--border); border-radius: 8px; width: 40px; height: 38px; cursor: pointer; align-items: center; justify-content: center; }
.nav-toggle svg { width: 20px; height: 20px; color: var(--ink); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 22px; border-radius: var(--radius); font-weight: 600; font-size: 1rem;
  border: 1px solid transparent; cursor: pointer; transition: background .15s, border-color .15s;
}
.btn:hover { text-decoration: none; }
.btn-primary { background: var(--accent); color: var(--white); }
.btn-primary:hover { background: var(--accent-hover); }
.btn-secondary { background: var(--white); color: var(--ink); border-color: var(--gray-300); }
.btn-secondary:hover { border-color: var(--gray-500); background: var(--gray-50); }
.btn-lg { padding: 15px 30px; font-size: 1.08rem; }
.btn-disabled { background: var(--gray-100); color: var(--gray-500); border-color: var(--border); cursor: default; }
.btn-disabled:hover { background: var(--gray-100); }
.btn svg { width: 18px; height: 18px; }

/* ---------- Sections ---------- */
section { padding: 72px 0; }
.section-head { max-width: 640px; margin: 0 auto 48px; text-align: center; }
.section-head h2 { margin-bottom: .3em; }
.section-head p { color: var(--gray-600); font-size: 1.1rem; margin: 0; }
.eyebrow { text-transform: uppercase; letter-spacing: .08em; font-size: .8rem; font-weight: 700; color: var(--gray-500); margin: 0 0 .6em; }

/* ---------- Hero ---------- */
.hero { padding: 84px 0 64px; background: linear-gradient(180deg, var(--gray-50), var(--white)); border-bottom: 1px solid var(--border); }
.hero-inner { display: grid; grid-template-columns: 1.05fr .95fr; gap: 56px; align-items: center; }
.hero h1 { font-size: 3rem; }
.hero p.lead { font-size: 1.25rem; color: var(--gray-600); margin-bottom: 1.6em; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-meta { margin-top: 18px; color: var(--gray-500); font-size: .92rem; }

.app-shot {
  display: block; width: 100%; max-width: 430px; height: auto; margin: 0 auto;
}

/* ---------- Feature grid ---------- */
.grid { display: grid; gap: 22px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.card {
  background: var(--white); border: 1px solid var(--border); border-radius: var(--radius-lg);
  padding: 26px; box-shadow: var(--shadow-sm);
}
.card .icon {
  width: 44px; height: 44px; border-radius: 10px; background: var(--gray-100);
  display: flex; align-items: center; justify-content: center; margin-bottom: 16px;
}
.card .icon svg { width: 22px; height: 22px; color: var(--ink); }
.card h3 { margin-bottom: .3em; }
.card p { color: var(--gray-600); font-size: .98rem; margin: 0; }

/* ---------- Steps ---------- */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; counter-reset: step; }
.step { padding: 26px; border: 1px solid var(--border); border-radius: var(--radius-lg); background: var(--gray-50); }
.step .num {
  width: 36px; height: 36px; border-radius: 50%; background: var(--ink); color: var(--white);
  display: flex; align-items: center; justify-content: center; font-weight: 700; margin-bottom: 14px;
}
.step h3 { margin-bottom: .3em; }
.step p { color: var(--gray-600); margin: 0; font-size: .98rem; }

/* ---------- Trust / alt sections ---------- */
.alt { background: var(--gray-50); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.trust-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 40px; align-items: center; }
.facts { list-style: none; padding: 0; margin: 0; }
.facts li { display: flex; gap: 12px; align-items: flex-start; padding: 10px 0; border-bottom: 1px solid var(--border); }
.facts li:last-child { border-bottom: none; }
.facts svg { width: 20px; height: 20px; color: var(--ok); flex-shrink: 0; margin-top: 3px; }

/* ---------- CTA ---------- */
.cta { text-align: center; background: var(--ink); color: var(--white); border-radius: 0; }
.cta h2 { color: var(--white); }
.cta p { color: var(--gray-300); max-width: 560px; margin: 0 auto 1.6em; font-size: 1.1rem; }
.cta .btn-primary { background: var(--white); color: var(--ink); }
.cta .btn-primary:hover { background: var(--gray-200); }

/* ---------- Download page ---------- */
.dl-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; }
.dl-card { border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 28px; background: var(--white); }
.dl-card .os { display: flex; align-items: center; gap: 12px; margin-bottom: 16px; }
.dl-card .os svg { width: 32px; height: 32px; color: var(--ink); }
.dl-card .os h3 { margin: 0; }
.dl-meta { list-style: none; padding: 0; margin: 0 0 18px; font-size: .92rem; color: var(--gray-600); }
.dl-meta li { display: flex; justify-content: space-between; padding: 7px 0; border-bottom: 1px dashed var(--border); }
.dl-meta li span:first-child { color: var(--gray-500); }
.hash {
  font-family: var(--mono); font-size: .82rem; background: var(--gray-50); border: 1px solid var(--border);
  border-radius: 8px; padding: 10px 12px; margin-top: 14px; word-break: break-all; color: var(--gray-600);
}
.hash .label { display: block; font-family: var(--font); font-size: .78rem; color: var(--gray-500); margin-bottom: 4px; font-weight: 600; }
.dl-soon { font-size: .85rem; color: var(--gray-500); margin: 14px 0 0; }

/* Auto-detected platform — primary block */
.dl-primary { margin-bottom: 14px; }
.dl-primary:empty { display: none; }
.dl-card.is-primary {
  position: relative; overflow: hidden;
  padding: 30px 34px 30px 36px;
  border: 1px solid var(--border);
  box-shadow: 0 12px 34px rgba(16, 19, 22, .09);
  display: grid; grid-template-columns: 1fr 300px; column-gap: 44px; row-gap: 18px; align-items: start;
}
.dl-card.is-primary::before { content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 4px; background: var(--ink); }
.dl-card.is-primary .os { grid-column: 1; grid-row: 1; margin: 0; }
.dl-card.is-primary .os h3 { font-size: 1.55rem; }
.dl-card.is-primary .os svg { width: 38px; height: 38px; }
.dl-card.is-primary .dl-meta { grid-column: 1; grid-row: 2; margin: 0; align-self: start; }
.dl-card.is-primary .btn-primary { grid-column: 2; grid-row: 1; width: 100% !important; }
.dl-card.is-primary .hash { grid-column: 2; grid-row: 2; margin-top: 0; align-self: start; }
.dl-card.is-primary .dl-soon { grid-column: 2; grid-row: 2; margin-top: 0; align-self: start; }
.dl-wrong { margin: 14px 2px 0; font-size: .92rem; color: var(--gray-500); }
.dl-wrong a { color: var(--gray-600); text-decoration: underline; text-underline-offset: 2px; }
.dl-wrong a:hover { color: var(--ink); }
.dl-others-head { font-size: 1.05rem; font-weight: 700; color: var(--gray-600); margin: 28px 0 18px; padding-top: 26px; border-top: 1px solid var(--border); }
#dlOthersHead { scroll-margin-top: 90px; }

/* ---------- Callout / notices ---------- */
.notice { border: 1px solid var(--border); border-left: 4px solid var(--gray-400); border-radius: 10px; padding: 18px 20px; background: var(--gray-50); margin: 22px 0; }
.notice.warn { border-left-color: var(--warn); background: #fdfaf0; }
.notice.ok { border-left-color: var(--ok); background: #f3faf5; }
.notice h3 { margin-bottom: .3em; font-size: 1.1rem; }
.notice p:last-child { margin-bottom: 0; }

/* ---------- Legal / prose ---------- */
.prose { max-width: 760px; margin: 0 auto; }
.prose h2 { font-size: 1.5rem; margin-top: 1.8em; }
.prose h3 { font-size: 1.15rem; margin-top: 1.4em; }
.prose p, .prose li { color: var(--gray-700); }
.page-head { padding: 56px 0 32px; border-bottom: 1px solid var(--border); background: var(--gray-50); }
.page-head h1 { margin-bottom: .2em; }
.page-head p { color: var(--gray-600); margin: 0; }
.updated { color: var(--gray-500); font-size: .92rem; }

/* ---------- FAQ ---------- */
.faq { max-width: 760px; margin: 0 auto; }
.faq details { border: 1px solid var(--border); border-radius: 10px; margin-bottom: 12px; background: var(--white); }
.faq summary { cursor: pointer; padding: 16px 20px; font-weight: 600; list-style: none; display: flex; justify-content: space-between; align-items: center; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; color: var(--gray-400); font-size: 1.4rem; font-weight: 400; }
.faq details[open] summary::after { content: "\2212"; }
.faq .answer { padding: 0 20px 18px; color: var(--gray-600); }
.faq .answer p:last-child { margin-bottom: 0; }

/* ---------- Contact block ---------- */
.contact-card { border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 28px; background: var(--gray-50); }
.contact-card dl { display: grid; grid-template-columns: 160px 1fr; gap: 10px 20px; margin: 0; }
.contact-card dt { color: var(--gray-500); font-weight: 600; }
.contact-card dd { margin: 0; }

/* ---------- Footer ---------- */
.site-footer { background: var(--ink); color: var(--gray-300); padding: 56px 0 28px; margin-top: 0; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 32px; }
.footer-brand .brand { color: var(--white); margin-bottom: 12px; }
.footer-brand .brand svg { color: var(--white); }
.footer-brand p { font-size: .9rem; color: var(--gray-400); max-width: 280px; }
.site-footer h4 { color: var(--white); font-size: .85rem; text-transform: uppercase; letter-spacing: .06em; margin: 0 0 14px; }
.site-footer ul { list-style: none; padding: 0; margin: 0; }
.site-footer li { margin: 8px 0; }
.site-footer a { color: var(--gray-300); font-size: .95rem; }
.site-footer a:hover { color: var(--white); }
.footer-bottom { border-top: 1px solid var(--gray-700); margin-top: 40px; padding-top: 20px; font-size: .85rem; color: var(--gray-400); display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; }

/* ---------- Responsive ---------- */
@media (max-width: 860px) {
  h1 { font-size: 2.1rem; }
  .hero h1 { font-size: 2.3rem; }
  .hero-inner, .trust-grid { grid-template-columns: 1fr; gap: 36px; }
  .grid-3, .steps { grid-template-columns: 1fr; }
  .grid-2, .dl-grid { grid-template-columns: 1fr; }
  .dl-card.is-primary { grid-template-columns: 1fr; padding: 24px; }
  .dl-card.is-primary > * { grid-column: 1 !important; grid-row: auto !important; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .nav-links {
    position: absolute; top: 64px; left: 0; right: 0; flex-direction: column; align-items: stretch;
    background: var(--white); border-bottom: 1px solid var(--border); padding: 8px 16px 16px; gap: 2px;
    display: none; box-shadow: var(--shadow);
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 12px; }
  .lang { margin: 8px 0 0; align-self: flex-start; }
  .lang-menu { right: auto; left: 0; }
  .nav-toggle { display: flex; }
  section { padding: 52px 0; }
  .contact-card dl { grid-template-columns: 1fr; gap: 2px 0; }
  .contact-card dt { margin-top: 10px; }
}
@media (max-width: 480px) {
  body { font-size: 16px; }
  .footer-grid { grid-template-columns: 1fr; }
  .hero h1 { font-size: 2rem; }
}