/* Socksicle site. Palette sampled from the app's dark theme
   (#12131b surface, #aab9f3 primary). Components reused from the app
   carry the same fixed metrics as their PySide6 originals. */

:root {
  --bg: #12131b;
  --surface: #1b1c26;
  --surface-2: #22232e;
  --surface-3: #2a2b37;
  --text: #e8e6ef;
  --text-2: #c6c4d2;
  --muted: #a3a1b2;
  --muted-2: #8b8998;
  --primary: #aab9f3;
  --on-primary: #1a2450;
  --primary-soft: rgba(170, 185, 243, .13);
  --outline: rgba(255, 255, 255, .09);
  --outline-2: rgba(255, 255, 255, .18);
  --ease: cubic-bezier(.16, 1, .3, 1);
  --wrap: 1240px;

  /* Material 3 Expressive Atmospheric Tones */
  --pri-glow: #6750A4;
  --pri-c: #4F378B;
  --ter-glow: #7D5260;
  --ter-c: #633B48;
  --sec-glow: #625B71;
  --sec-c: #4A4458;

  /* Harmonious M3 Dark Theme Tonal Badges & Kickers */
  --tint-pri-bg: rgba(170, 185, 243, 0.14);
  --tint-pri-fg: #aab9f3;
  --tint-pri-kicker: #aab9f3;

  --tint-ter-bg: rgba(222, 188, 223, 0.14);
  --tint-ter-fg: #debcdf;
  --tint-ter-kicker: #debcdf;

  --tint-sage-bg: rgba(166, 215, 178, 0.14);
  --tint-sage-fg: #a6d7b2;
  --tint-sage-kicker: #a6d7b2;

  --tint-sand-bg: rgba(235, 195, 155, 0.14);
  --tint-sand-fg: #ebc39b;
  --tint-sand-kicker: #ebc39b;

  --tint-slate-bg: rgba(168, 199, 235, 0.14);
  --tint-slate-fg: #a8c7eb;
  --tint-slate-kicker: #a8c7eb;
}

*, *::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-family: "Plus Jakarta Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 15.5px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: clip;
}

main {
  position: relative;
  z-index: 1;
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
ul { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4, p { margin: 0; }
code, .mono {
  font-family: "JetBrains Mono", ui-monospace, "Cascadia Mono", Consolas, monospace;
  font-variant-numeric: tabular-nums;
}
code { font-size: .88em; background: var(--surface-2); color: var(--text-2); padding: 1px 5px; border-radius: 5px; }

::selection { background: var(--primary); color: var(--on-primary); }

:focus-visible { outline: 2px solid var(--primary); outline-offset: 3px; border-radius: 4px; }

.sprite { position: absolute; width: 0; height: 0; overflow: hidden; }
.i { width: 24px; height: 24px; flex: none; }
.i--14 { width: 14px; height: 14px; }
.i--16 { width: 16px; height: 16px; }
.i--18 { width: 18px; height: 18px; }
.i--20 { width: 20px; height: 20px; }
.i--22 { width: 22px; height: 22px; }

.skip {
  position: fixed; top: 10px; left: 10px; z-index: 100;
  padding: 9px 16px; border-radius: 999px;
  background: var(--primary); color: var(--on-primary);
  font-size: 13px; font-weight: 600;
  transform: translateY(-160%);
  transition: transform .2s var(--ease);
}
.skip:focus-visible { transform: none; }

.wrap {
  --pad: 24px;
  width: 100%; max-width: var(--wrap); margin: 0 auto; padding: 0 var(--pad);
}
.wrap--narrow { max-width: 780px; }

/* App bar */

.appbar {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color .2s, background-color .2s, box-shadow .2s;
}
.appbar.is-stuck {
  border-bottom-color: var(--outline);
  box-shadow: 0 4px 20px rgba(0, 0, 0, .14);
}
.appbar__inner {
  max-width: var(--wrap); margin: 0 auto; padding: 0 24px;
  height: 64px; display: flex; align-items: center; gap: 16px;
}

.brand { display: inline-flex; align-items: center; gap: 9px; flex: none; }
.brand__mark { width: 30px; height: 30px; transition: transform .3s var(--ease); }
.brand:hover .brand__mark { transform: rotate(15deg) scale(1.05); }
.brand__name { font-size: 17px; font-weight: 700; letter-spacing: -.015em; }

.nav { display: flex; align-items: center; gap: 4px; margin-left: 8px; }
.nav a {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 7px 12px; border-radius: 8px;
  font-size: 13.5px; color: var(--muted);
  transition: color .15s, background .15s;
  white-space: nowrap;
}
.nav a:hover { color: var(--text); background: var(--surface-2); }

.appbar__actions { display: flex; align-items: center; gap: 8px; margin-left: auto; }

/* Language switcher */
.lang-switch {
  position: relative;
  display: inline-flex;
  align-items: center;
  height: 34px;
  padding: 3px;
  border-radius: 999px;
  background: var(--surface-2);
  border: 1px solid var(--outline-2);
  user-select: none;
}
.lang-switch__slider {
  position: absolute;
  top: 3px;
  left: 3px;
  width: 32px;
  height: 26px;
  border-radius: 999px;
  background: var(--primary);
  box-shadow: 0 2px 6px rgba(0, 0, 0, .25);
  transition: transform .25s cubic-bezier(.34, 1.56, .64, 1);
  pointer-events: none;
}
.lang-switch[data-lang="ru"] .lang-switch__slider {
  transform: translateX(32px);
}
.lang-switch__btn {
  position: relative;
  z-index: 1;
  width: 32px;
  height: 26px;
  display: grid;
  place-items: center;
  border-radius: 999px;
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: .04em;
  color: #c6c4d2;
  transition: color .18s ease;
  cursor: pointer;
}
.lang-switch__btn:hover {
  color: var(--text);
}
.lang-switch[data-lang="en"] .lang-switch__btn[data-lang-btn="en"],
.lang-switch[data-lang="ru"] .lang-switch__btn[data-lang-btn="ru"] {
  color: #12131b;
  font-weight: 800;
}

.icon-btn {
  width: 38px; height: 38px; display: grid; place-items: center;
  border-radius: 50%; color: var(--text-2);
  transition: background .15s, color .15s, transform .2s;
}
.icon-btn:hover { background: var(--surface-2); color: var(--text); transform: scale(1.05); }

.menu-btn { display: none; }

/* Buttons */

.btn {
  position: relative; overflow: hidden;
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  height: 44px; padding: 0 22px; border-radius: 999px;
  font-size: 14.5px; font-weight: 600; white-space: nowrap;
  transition: background .15s, border-color .15s, color .15s, transform .2s var(--ease), box-shadow .2s;
}
.btn::after {
  content: ""; position: absolute; inset: 0; border-radius: inherit;
  background: currentColor; opacity: 0; transition: opacity .15s; pointer-events: none;
}
.btn:hover { transform: translateY(-1px); }
.btn:hover::after { opacity: .08; }
.btn:active { transform: translateY(0); }
.btn:active::after { opacity: .14; }
.btn--filled { background: var(--primary); color: var(--on-primary); box-shadow: 0 4px 14px var(--primary-soft); }
.btn--filled:hover { box-shadow: 0 6px 20px var(--primary-soft); }
.btn--outlined { border: 1px solid var(--outline-2); color: var(--text); background: var(--surface); }
.btn--outlined:hover { border-color: var(--primary); color: var(--primary); background: var(--surface-2); }
.btn--ghost { border: 1px solid transparent; color: var(--muted); }
.btn--ghost:hover { color: var(--text); background: var(--surface-2); }
.btn--sm { height: 36px; padding: 0 16px; font-size: 13px; }
.btn--lg { height: 50px; padding: 0 26px; font-size: 15px; }

.ripple__wave {
  position: absolute; border-radius: 50%; pointer-events: none;
  background: currentColor; opacity: .2;
  transform: translate(-50%, -50%) scale(0);
  animation: ripple .5s var(--ease) forwards;
}
@keyframes ripple { to { transform: translate(-50%, -50%) scale(1); opacity: 0; } }

/* Hero */

.hero { padding: 56px 0 32px; }
.hero__grid {
  display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
  align-items: start; gap: 48px;
}
.hero__copy { max-width: 600px; padding-top: 20px; }

h1 {
  font-size: clamp(34px, 4.5vw, 54px);
  line-height: 1.08; letter-spacing: -.03em; font-weight: 700;
}
h1 .accent { color: var(--primary); }

.lede {
  margin-top: 18px; max-width: 36em;
  font-size: 16px; line-height: 1.62; color: var(--muted);
}

.hero__cta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.hero__note { margin-top: 18px; font-size: 12.5px; color: var(--muted-2); }

.hero__visual { display: flex; justify-content: center; position: relative; }
.hero__visual-wrap {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100%;
}
.hero__shot {
  position: relative;
  z-index: 1;
  width: min(100%, 380px); height: auto; border-radius: 28px;
  box-shadow: 0 20px 50px rgba(0, 0, 0, .36), 0 0 0 1px var(--outline);
  transition: transform .4s var(--ease), box-shadow .4s var(--ease);
}
.hero__shot:hover {
  transform: translateY(-4px) scale(1.01);
  box-shadow: 0 24px 60px rgba(0, 0, 0, .45), 0 0 0 1px var(--outline-2);
}
@keyframes hero-shape-drift {
  0% { transform: translate(-50%, -50%) rotate(0deg) scale(0.95); }
  50% { transform: translate(-48%, -52%) rotate(8deg) scale(1.05); }
  100% { transform: translate(-50%, -50%) rotate(-7deg) scale(0.98); }
}

/* Section scaffold */

.section { padding: 88px 0; scroll-margin-top: 76px; }

.section__head { max-width: 680px; margin-bottom: 34px; }
.section__head h2 {
  font-size: clamp(25px, 3vw, 34px); line-height: 1.15;
  letter-spacing: -.025em; font-weight: 700;
}
.section__head p { margin-top: 10px; font-size: 15.5px; color: var(--muted); }

.reveal { opacity: 1; }
.js .reveal {
  opacity: 0; transform: translateY(16px);
  transition: opacity .55s var(--ease) var(--d, 0s), transform .55s var(--ease) var(--d, 0s);
}
.js .reveal.is-in { opacity: 1; transform: none; }

/* Protocol table */

.proto { width: 100%; border-collapse: collapse; text-align: left; }
.proto thead th {
  padding: 0 16px 10px 0; border-bottom: 1px solid var(--outline-2);
  font-size: 11px; font-weight: 600; letter-spacing: .1em; text-transform: uppercase;
  color: var(--muted-2);
}
.proto tbody tr {
  border-bottom: 1px solid var(--outline);
  transition: background-color .15s;
}
.proto tbody tr:hover {
  background: color-mix(in srgb, var(--surface-2) 40%, transparent);
}
.proto tbody th {
  padding: 15px 16px 15px 0; font-size: 14.5px; font-weight: 600;
  white-space: nowrap; vertical-align: top;
}
.proto td { padding: 15px 16px 15px 0; font-size: 13.5px; color: var(--muted); vertical-align: top; }
.proto td.mono { font-size: 12.5px; white-space: nowrap; color: var(--text-2); }
.proto th[scope="col"]:last-child, .proto td:last-child { padding-right: 0; }

.formats {
  display: flex; flex-wrap: wrap; gap: 8px 14px;
  margin-top: 20px; font-size: 12px; color: var(--muted-2);
}
.formats .mono { font-size: 11.5px; word-break: break-word; }

.set-icon {
  width: 40px; height: 40px; flex: none;
  display: grid; place-items: center;
  border-radius: 12px; background: var(--primary-soft); color: var(--primary);
}
.set-icon--lg { width: 44px; height: 44px; border-radius: 14px; }

/* Screens */

.screens { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.screen {
  margin: 0; padding: 12px; border-radius: 24px;
  background: var(--surface); border: 1px solid var(--outline);
  transition: transform .25s var(--ease), border-color .25s, box-shadow .25s;
}
.screen:hover {
  transform: translateY(-3px);
  border-color: var(--outline-2);
  box-shadow: 0 12px 30px rgba(0, 0, 0, .2);
}
.screen img { width: 100%; height: auto; border-radius: 18px; }
.screen figcaption { display: flex; flex-direction: column; gap: 2px; padding: 12px 6px 4px; }
.screen figcaption span:first-child { font-size: 13.5px; font-weight: 700; }
.screen figcaption span:last-child { font-size: 12.5px; color: var(--muted); }

/* Installation Section */

.install-card {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--outline);
  border-radius: 36px 20px 36px 20px;
  overflow: hidden;
  box-shadow: 0 10px 36px rgba(0, 0, 0, .16);
}
.install-card > *:not(.card__shape-silhouette) {
  position: relative;
  z-index: 1;
}
.install-tabs {
  display: flex;
  background: var(--surface-2);
  border-bottom: 1px solid var(--outline);
  overflow-x: auto;
  scrollbar-width: none;
}
.install-tabs::-webkit-scrollbar { display: none; }
.install-tab {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 16px 24px;
  font-size: 14px; font-weight: 600; color: var(--muted);
  border-bottom: 2px solid transparent;
  white-space: nowrap;
  transition: all .2s var(--ease);
}
.install-tab:hover { color: var(--text); background: rgba(255, 255, 255, .02); }
.install-tab.is-active {
  color: var(--primary);
  border-bottom-color: var(--primary);
  background: var(--surface);
}
.install-panel {
  display: none;
  padding: 32px;
}
.install-panel.is-active {
  display: block;
}
.install-panel h3 { font-size: 20px; font-weight: 700; margin-bottom: 8px; }
.install-panel p { color: var(--muted); font-size: 14.5px; margin-bottom: 20px; line-height: 1.6; }

.code-box {
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 14px 18px; border-radius: 14px;
  background: var(--bg); border: 1px solid var(--outline-2);
  margin-bottom: 24px;
}
.code-box--multiline {
  align-items: flex-start;
}
.code-box pre { margin: 0; }
.code-box__text {
  font-size: 13.5px; color: var(--primary); word-break: break-all;
}
.code-box--multiline .code-box__text {
  white-space: pre-wrap; line-height: 1.6;
}
.copy-btn {
  flex: none; min-width: 96px; gap: 6px;
}
.copy-btn .i-check { display: none; }
.copy-btn.is-copied {
  background: #22c55e !important; color: #ffffff !important;
}
.copy-btn.is-copied .i-copy { display: none; }
.copy-btn.is-copied .i-check { display: block; }

.install-alt {
  display: flex; flex-direction: column; gap: 10px;
  padding-top: 18px; border-top: 1px solid var(--outline);
}
.install-alt__label { font-size: 13px; color: var(--muted); }
.install-alt__actions { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; }
.fine-code { font-size: 12px; color: var(--muted-2); word-break: break-all; }

.windows-dl-buttons {
  display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 18px;
}
.install-note { font-size: 12.5px; color: var(--muted-2); margin-top: 12px; }

/* Download section */

.dl-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; }
.dl-card {
  position: relative;
  overflow: hidden;
  display: flex; flex-direction: column;
  padding: 24px; border-radius: 28px 16px 28px 16px;
  background: var(--surface); border: 1px solid var(--outline);
  transition: transform .25s var(--ease), border-color .25s, box-shadow .25s;
}
.dl-card > *:not(.card__shape-silhouette) {
  position: relative;
  z-index: 1;
}
.dl-card:hover {
  transform: translateY(-3px);
  border-color: var(--outline-2);
  box-shadow: 0 14px 34px rgba(0, 0, 0, .24);
}
.dl-card__head { display: flex; align-items: flex-start; gap: 12px; margin-bottom: 12px; }
.dl-card__head h3 { font-size: 16px; font-weight: 700; line-height: 1.3; }
.dl-card__head p { margin-top: 2px; font-size: 12px; color: var(--muted); }

.dl-link {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 12px 0; border-top: 1px solid var(--outline);
  font-size: 14px; font-weight: 500;
  transition: color .15s;
}
.dl-link:hover { color: var(--primary); }
.dl-link > span:first-child { display: flex; flex-direction: column; gap: 1px; }
.dl-link em { font-style: normal; font-size: 11px; font-weight: 400; color: var(--muted-2); }
.dl-link .mono {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 11px; font-weight: 400; color: var(--muted-2); white-space: nowrap;
}
.dl-link:hover .mono { color: var(--primary); }
.dl-card .dl-link:last-child { margin-top: auto; }

.fine { margin-top: 20px; max-width: 80ch; font-size: 12.5px; line-height: 1.65; color: var(--muted-2); }
.fine code { font-size: 11px; }

/* FAQ Accordion with smooth open/close animation */

.faq { border-top: 1px solid var(--outline); }
.faq details {
  border-bottom: 1px solid var(--outline);
  overflow: hidden;
  transition: background-color .2s;
}
.faq details:hover {
  background: color-mix(in srgb, var(--surface) 35%, transparent);
}
.faq summary {
  display: flex; align-items: center; justify-content: space-between; gap: 20px;
  padding: 18px 8px; cursor: pointer; list-style: none;
  font-size: 16px; font-weight: 600;
  transition: color .2s var(--ease);
  user-select: none;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "";
  flex: none;
  width: 28px;
  height: 28px;
  display: block;
  border-radius: 50%;
  background-color: var(--surface-2);
  background-image:
    linear-gradient(currentColor, currentColor),
    linear-gradient(currentColor, currentColor);
  background-position: center center;
  background-size: 12px 2px, 2px 12px;
  background-repeat: no-repeat;
  color: var(--muted-2);
  transition: transform .26s var(--ease), background-color .2s, color .2s;
}
.faq summary:hover { color: var(--primary); }
.faq summary:hover::after {
  color: var(--primary);
  background-color: var(--primary-soft);
}
.faq details[open] summary::after {
  transform: rotate(45deg);
  background-color: var(--primary);
  color: var(--on-primary);
}
.faq details .faq__content {
  overflow: hidden;
}
.faq details p {
  padding: 0 44px 20px 8px;
  font-size: 14.5px;
  line-height: 1.68;
  color: var(--muted);
}

/* Donate Section */

.donate-grid {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 28px;
  padding: 8px 0;
}
.donate-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}
.donate-item iframe {
  box-shadow: 0 16px 40px rgba(0, 0, 0, .32);
}
.donate-item__caption {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-2);
  letter-spacing: .02em;
}

/* Footer */

.footer { position: relative; z-index: 1; padding: 56px 0 26px; border-top: 1px solid var(--outline); }
.footer__inner { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 36px; }
.footer__brand p { margin-top: 12px; max-width: 32ch; font-size: 13.5px; color: var(--muted); }
.footer__meta { font-size: 11px; letter-spacing: .08em; text-transform: uppercase; color: var(--muted-2); }
.footer__col { display: flex; flex-direction: column; gap: 8px; }
.footer__col h4 {
  margin: 0 0 3px; font-size: 11px; font-weight: 600;
  letter-spacing: .1em; text-transform: uppercase; color: var(--muted-2);
}
.footer__col a {
  display: inline-flex; align-items: center; gap: 7px;
  width: fit-content; font-size: 13.5px; color: var(--muted);
  transition: color .15s;
}
.footer__col a:hover { color: var(--primary); }
.footer__bottom {
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px 24px;
  margin-top: 40px; padding-top: 18px; border-top: 1px solid var(--outline);
  font-size: 11.5px; color: var(--muted-2);
}

/* Silky smooth language switch cross-fade & layout stability */

.is-switching-lang main,
.is-switching-lang .nav {
  opacity: 0;
  transition: opacity .12s cubic-bezier(.2, 0, 0, 1);
}
main, .nav {
  transition: opacity .18s cubic-bezier(.16, 1, .3, 1);
}

/* Motion preferences */

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .001ms !important; transition-duration: .001ms !important; }
  .js .reveal { opacity: 1; transform: none; }
}

/* Responsive */

@media (max-width: 960px) {
  .hero { padding-top: 32px; }
  .hero__grid { grid-template-columns: 1fr; gap: 40px; }
  .hero__copy { max-width: 640px; padding-top: 0; }
  .hero__visual { justify-content: center; }
  .hero__shot { width: min(100%, 340px); }

  .dl-grid { grid-template-columns: 1fr 1fr; }
  .dl-card:last-child { grid-column: 1 / -1; }
  .footer__inner { grid-template-columns: 1fr 1fr 1fr; }
  .footer__brand { grid-column: 1 / -1; }
}

@media (max-width: 880px) {
  .nav {
    position: absolute; top: calc(100% + 6px); left: 18px; right: 18px;
    display: none; flex-direction: column; align-items: stretch; gap: 2px;
    margin: 0; padding: 6px;
    background: var(--surface); border: 1px solid var(--outline-2); border-radius: 16px;
    box-shadow: 0 12px 30px rgba(0, 0, 0, .25);
  }
  .nav.is-open { display: flex; }
  .nav a { padding: 11px 14px; border-radius: 10px; font-size: 14.5px; color: var(--text-2); }
  .menu-btn { display: grid; }
  .github-btn { display: none; }

  .screens {
    display: flex; overflow-x: auto; scroll-snap-type: x mandatory;
    margin-inline: calc(var(--pad) * -1); padding: 0 var(--pad) 4px;
    scrollbar-width: none;
  }
  .screens::-webkit-scrollbar { display: none; }
  .screen { flex: 0 0 72%; scroll-snap-align: center; }
}

@media (max-width: 720px) {
  .wrap { --pad: 18px; }
  .appbar__inner { padding-inline: 18px; height: 60px; }
  .section { padding: 64px 0; }
  .section__head { margin-bottom: 24px; }

  .proto thead th:nth-child(3), .proto td:nth-child(3) { display: none; }
  .proto tbody th { white-space: normal; }

  .install-panel { padding: 20px; }
  .code-box { flex-direction: column; align-items: stretch; }
  .copy-btn { width: 100%; }

  .dl-grid { grid-template-columns: 1fr; }
  .footer__inner { grid-template-columns: 1fr 1fr; gap: 28px; }
  .footer__brand { grid-column: 1 / -1; }
  .footer__bottom { margin-top: 28px; }
}

@media (max-width: 560px) {
  .appbar__actions .btn--filled { display: none; }
  .hero__cta { flex-direction: column; align-items: stretch; }
  .btn--lg { width: 100%; }
  .screen { flex-basis: 84%; }
  .faq details p { padding-right: 12px; }
  .windows-dl-buttons { flex-direction: column; }
}

@media (max-width: 400px) {
  .install-tab { padding: 12px 16px; font-size: 13px; }
}

@media (max-width: 360px) {
  h1 { font-size: 32px; }
}