:root {
  color-scheme: light;
  --bg: #f2f5f9;
  --panel: #ffffff;
  --field: #f8fafd;
  --text: #172235;
  --muted: #657386;
  --border: #d6dee8;
  --accent: #0b86f7;
  --accent-soft: #e9f4ff;
  --shadow: #14243a18;
  --shot-shadow: #14243a2b;
  --warning: #fff4e5;
  --warning-text: #9a4b00;
  --header-height: 68px;
}

* { box-sizing: border-box; }
html {
  min-height: 100%;
  background: var(--bg);
  scroll-behavior: smooth;
  scrollbar-gutter: stable;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}
body {
  min-width: 280px;
  min-height: 100%;
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  overflow-x: hidden;
}
button, input, select { font: inherit; }
a { color: var(--accent); }
code {
  padding: 2px 5px;
  border-radius: 5px;
  background: var(--accent-soft);
  font-family: Consolas, "SFMono-Regular", monospace;
  overflow-wrap: anywhere;
}
.wrap { width: min(1080px, calc(100% - 36px)); margin-inline: auto; }

.site-header { position: relative; z-index: 40; background: var(--bg); }
.top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  height: var(--header-height);
  padding: 0;
}
.logo { display: flex; flex: 0 0 auto; align-items: center; text-decoration: none; }
.logo picture, .logo img { display: block; }
.logo img { width: auto; height: 25px; }
.nav { display: flex; flex: 1 1 auto; align-items: center; justify-content: flex-end; gap: 21px; }
.nav a { color: var(--muted); text-decoration: none; }
.nav a:hover, .nav a[aria-current="page"] { color: var(--accent); }
.menu-toggle {
  display: none;
  place-items: center;
  width: 42px;
  height: 42px;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 11px;
  background: var(--panel);
  color: var(--text);
  cursor: pointer;
}
.menu-toggle svg { width: 22px; height: 22px; }
.menu-toggle .icon-close { display: none; }
.menu-toggle[aria-expanded="true"] .icon-menu { display: none; }
.menu-toggle[aria-expanded="true"] .icon-close { display: block; }

.hero { padding: 70px 0 55px; }
.hero-content { width: 100%; }
.eyebrow { color: var(--accent); font-weight: 650; }
.hero h1 {
  margin: 10px 0 18px;
  font-size: clamp(38px, 4.65vw, 52px);
  line-height: 1.08;
  letter-spacing: -2px;
  white-space: nowrap;
}
.lead { max-width: 100%; margin-bottom: 0; color: var(--muted); font-size: 20px; letter-spacing: -.1px; }

.calc-demo { margin: 40px 0 0; }
.calc-demo-desktop {
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 64px;
  padding: 8px 10px 8px 15px;
  border: 1px solid var(--border);
  border-radius: 15px;
  background: var(--panel);
  box-shadow: 0 11px 25px var(--shot-shadow);
}
.demo-logo img { display: block; width: 142px; height: auto; }
.demo-field {
  display: flex;
  flex: 1 1 auto;
  align-items: center;
  min-width: 0;
  height: 44px;
  padding: 0 14px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--field);
  font-family: Consolas, "SFMono-Regular", monospace;
  font-size: 16px;
  white-space: nowrap;
  overflow: hidden;
}
.demo-expression { color: var(--text); }
.demo-result { margin-left: .35em; color: var(--muted); opacity: .86; }
.demo-result.is-confirmed { color: var(--text); opacity: 1; }
.demo-caret {
  width: 1px;
  height: 19px;
  margin-left: 1px;
  background: var(--text);
  animation: caret-blink .85s steps(1) infinite;
}
@keyframes caret-blink { 50% { opacity: 0; } }
.demo-control {
  display: grid;
  flex: 0 0 auto;
  place-items: center;
  width: 40px;
  height: 42px;
  border-radius: 10px;
  color: var(--text);
  font-size: 14px;
}
.demo-control.copy svg { width: 20px; height: 20px; }
.demo-control.pin { background: var(--accent); color: #fff; }
.demo-control.pin svg { width: 23px; height: 23px; }
.demo-control.close { width: 42px; }
.demo-control.close svg { width: 22px; height: 22px; }
.calc-demo-mobile { display: none; }

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: 12px;
  margin-top: 40px;
}
.download-group { display: grid; justify-items: center; width: 220px; }
.download-group .meta { width: 100%; margin: 5px 0 0; text-align: center; white-space: nowrap; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.feedback-actions {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  width: min(100%, 820px);
  margin-top: 24px;
}
.feedback-actions .button { width: 100%; }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 11px 19px;
  border: 1px solid var(--accent);
  border-radius: 10px;
  background: var(--accent);
  color: #fff;
  font-weight: 650;
  text-align: center;
  text-decoration: none;
}
#download { width: 100%; }
.button:hover { filter: brightness(.96); }
.button.secondary { border-color: var(--border); background: transparent; color: var(--text); }
.button.secondary:hover { border-color: var(--accent); }

section { padding: 38px 0; scroll-margin-top: 24px; }
h1, h2, h3 { line-height: 1.2; }
h2 { margin: 0 0 20px; font-size: 30px; letter-spacing: -.5px; }
h3 { margin: 0 0 8px; font-size: 18px; }
p { margin: 0 0 14px; }
.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.card {
  padding: 20px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--panel);
}
.card p:last-child { margin-bottom: 0; }
.card p, .meta { color: var(--muted); }
.info { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.steps { counter-reset: step; }
.step { display: grid; grid-template-columns: 27px minmax(0, 1fr); align-items: start; gap: 13px; margin: 13px 0; }
.step::before {
  counter-increment: step;
  content: counter(step);
  display: grid;
  place-items: center;
  width: 27px;
  height: 27px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-weight: 650;
}
.page-head { padding: 54px 0 28px; }
.page-head h1 { margin: 0 0 12px; font-size: clamp(34px, 5vw, 52px); letter-spacing: -1px; }
.page-head p { max-width: 760px; color: var(--muted); font-size: 18px; }
.content { max-width: none; }
.content section { padding: 24px 0; }
.content ul, .content ol { padding-left: 24px; }
.content li + li { margin-top: 7px; }
.notice {
  margin: 18px 0;
  padding: 15px 17px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--panel);
}
.warning { background: var(--warning); color: var(--warning-text); }
.faq-layout, .version-layout {
  display: grid;
  grid-template-columns: minmax(280px, 300px) minmax(0, 1fr);
  align-items: start;
  gap: 36px;
}
.faq-sidebar, .version-sidebar {
  position: sticky;
  top: calc(var(--header-height) + 24px);
  max-height: calc(100vh - var(--header-height) - 48px);
  overflow-y: auto;
  scrollbar-width: thin;
}
.faq-toc, .version-toc { display: grid; gap: 4px; padding: 0; }
.faq-toc a, .version-toc a {
  position: relative;
  padding: 10px 14px 10px 18px;
  border-radius: 9px;
  color: var(--muted);
  text-decoration: none;
}
.faq-toc a::before, .version-toc a::before {
  content: "";
  position: absolute;
  top: 8px;
  bottom: 8px;
  left: 0;
  width: 3px;
  border-radius: 3px;
  background: transparent;
}
.faq-toc a:hover, .version-toc a:hover { color: var(--accent); background: var(--accent-soft); }
.faq-toc a.is-active, .version-toc a.is-active { color: var(--accent); background: var(--accent-soft); font-weight: 650; }
.faq-toc a.is-active::before, .version-toc a.is-active::before { background: var(--accent); }
.faq-controls { display: grid; gap: 4px; margin-top: 10px; }
.faq-controls button {
  width: 100%;
  padding: 10px 14px 10px 18px;
  border: 0;
  border-radius: 9px;
  background: transparent;
  color: var(--muted);
  text-align: left;
  cursor: pointer;
}
.faq-controls button:hover { color: var(--accent); background: var(--accent-soft); }
.faq-controls button:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.mobile-toc { display: none; }
.mobile-toc-toggle {
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  padding: 0;
  border: 1px solid var(--accent);
  border-radius: 12px;
  background: var(--accent);
  color: #fff;
  box-shadow: 0 8px 20px var(--shot-shadow);
  cursor: pointer;
}
.mobile-toc-toggle svg { width: 23px; height: 23px; }
.mobile-toc-toggle .icon-close { display: none; }
.mobile-toc-toggle[aria-expanded="true"] .icon-list { display: none; }
.mobile-toc-toggle[aria-expanded="true"] .icon-close { display: block; }
.mobile-toc-toggle:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
.mobile-toc-panel {
  position: absolute;
  bottom: calc(100% + 10px);
  left: 0;
  display: grid;
  width: min(310px, calc(100vw - 28px));
  max-height: min(430px, calc(100vh - 120px));
  gap: 3px;
  padding: 8px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--panel);
  box-shadow: 0 14px 35px var(--shadow);
  overflow-y: auto;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  pointer-events: none;
  transition: opacity .18s ease, transform .18s ease, visibility .18s ease;
}
.mobile-toc-panel.is-open { opacity: 1; visibility: visible; transform: translateY(0); pointer-events: auto; }
.mobile-toc-panel a {
  padding: 11px 13px;
  border-radius: 9px;
  color: var(--muted);
  font-weight: 600;
  text-decoration: none;
}
.mobile-toc-panel a:hover, .mobile-toc-panel a.is-active { color: var(--accent); background: var(--accent-soft); }
.mobile-toc-panel .faq-controls {
  gap: 3px;
  margin-top: 5px;
  padding-top: 6px;
  border-top: 1px solid var(--border);
}
.mobile-toc-panel .faq-controls button { padding: 11px 13px; }
.faq-groups { min-width: 0; }
.content .faq-group { padding: 0 0 42px; scroll-margin-top: 28px; }
.content .faq-group:last-child { padding-bottom: 0; }
.faq-group h2 { margin-bottom: 16px; }
.faq-list { display: grid; gap: 10px; }
.faq-list details { border: 1px solid var(--border); border-radius: 12px; background: var(--panel); overflow: hidden; }
.faq-list summary {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 22px;
  align-items: center;
  gap: 14px;
  padding: 16px 18px;
  cursor: pointer;
  font-weight: 650;
  list-style: none;
}
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after {
  content: "";
  width: 10px;
  height: 10px;
  margin: 0 auto 5px;
  border-right: 2px solid var(--muted);
  border-bottom: 2px solid var(--muted);
  transform: rotate(45deg);
  transition: transform .16s ease, margin .16s ease;
}
.faq-list details[open] summary::after { margin: 5px auto 0; transform: rotate(225deg); }
.faq-answer { padding: 0 18px 17px; color: var(--muted); }
.faq-answer p:last-child, .faq-answer ul:last-child { margin-bottom: 0; }
.release { margin: 0 0 16px; padding: 20px; border: 1px solid var(--border); border-radius: 14px; background: var(--panel); }
.release-list { min-width: 0; }
.release[data-scroll-section] { scroll-margin-top: 24px; }
.release-head { display: flex; justify-content: space-between; gap: 16px; align-items: baseline; }
.release time { color: var(--muted); }
.link-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
.link-grid h3 a { text-decoration: underline; text-underline-offset: 2px; }

footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  flex-wrap: wrap;
  min-height: 88px;
  margin-top: 42px;
  padding: 25px 0;
  border-top: 1px solid var(--border);
  color: var(--muted);
}
footer nav { display: flex; flex-wrap: wrap; gap: 14px; }

.back-to-top {
  position: fixed;
  right: 22px;
  bottom: 22px;
  z-index: 30;
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  padding: 0;
  border: 1px solid var(--accent);
  border-radius: 12px;
  background: var(--accent);
  color: #fff;
  box-shadow: 0 8px 20px var(--shot-shadow);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  pointer-events: none;
  transition: opacity .18s ease, transform .18s ease, visibility .18s ease, filter .18s ease;
}
.back-to-top svg { display: block; width: 25px; height: 25px; }
.back-to-top:hover { filter: brightness(.96); }
.back-to-top:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
.back-to-top.is-visible { opacity: 1; visibility: visible; transform: translateY(0); pointer-events: auto; }

.not-found { display: grid; place-items: center; min-height: calc(100vh - var(--header-height) - 130px); padding: 60px 0; text-align: center; }
.not-found-inner { max-width: 620px; }
.not-found-code { margin-bottom: 8px; color: var(--accent); font-size: clamp(70px, 14vw, 130px); font-weight: 750; line-height: 1; }
.not-found h1 { margin: 0 0 12px; font-size: clamp(30px, 5vw, 46px); }
.not-found p { margin-bottom: 26px; color: var(--muted); font-size: 18px; }

@media (max-width: 820px) {
  :root { --header-height: 62px; }
  .wrap { width: min(100% - 32px, 680px); }
  .top { height: var(--header-height); }
  .logo img { height: 23px; }
  .menu-toggle { display: grid; }
  .nav {
    position: absolute;
    top: calc(100% - 2px);
    right: 16px;
    left: auto;
    display: grid;
    width: max-content;
    max-width: calc(100vw - 32px);
    gap: 2px;
    padding: 8px;
    border: 1px solid var(--border);
    border-radius: 14px;
    background: var(--panel);
    box-shadow: 0 14px 35px var(--shadow);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-6px);
    pointer-events: none;
    transition: opacity .16s ease, transform .16s ease, visibility .16s ease;
  }
  .nav.is-open { opacity: 1; visibility: visible; transform: translateY(0); pointer-events: auto; }
  .nav a { padding: 10px 12px; border-radius: 9px; white-space: nowrap; }
  .nav a:hover, .nav a[aria-current="page"] { background: var(--accent-soft); }
  .hero { padding: 42px 0 40px; }
  .hero h1 { white-space: normal; }
  .grid { grid-template-columns: repeat(2, 1fr); }
  .faq-layout, .version-layout { grid-template-columns: minmax(205px, 225px) minmax(0, 1fr); gap: 24px; }
}

@media (min-width: 1680px) {
  .faq-layout, .version-layout { grid-template-columns: minmax(0, 1fr); gap: 0; }
  .faq-sidebar, .version-sidebar {
    grid-area: 1 / 1;
    width: min(300px, calc((100vw - 1080px) / 2 - 36px));
    transform: translateX(calc(-100% - 36px));
  }
  .faq-groups, .release-list { grid-area: 1 / 1; }
}

@media (max-width: 560px) {
  .wrap { width: min(100% - 28px, 480px); }
  .top { gap: 12px; }
  .logo img { height: 22px; }
  .hero { padding: 30px 0 28px; }
  .eyebrow { font-size: 14px; }
  .hero h1 {
    margin: 9px 0 14px;
    font-size: clamp(30px, 9vw, 36px);
    line-height: 1.09;
    letter-spacing: -1.1px;
  }
  .lead { font-size: 16.5px; line-height: 1.55; }
  .calc-demo { margin-top: 28px; }
  .calc-demo-desktop { display: none; }
  .calc-demo-mobile {
    display: block;
    padding: 14px;
    border: 1px solid var(--border);
    border-radius: 14px;
    background: var(--panel);
    box-shadow: 0 9px 22px var(--shot-shadow);
  }
  .calc-demo-mobile .demo-field { width: 100%; height: 42px; padding: 0 12px; font-size: 14px; }
  .calc-demo-mobile p { margin: 12px 2px 0; color: var(--muted); font-size: 13.5px; line-height: 1.48; }
  .hero-actions { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 30px; }
  .download-group { display: contents; }
  .download-group .meta { grid-column: 1 / -1; grid-row: 2; margin: -2px 0 0; text-align: center; white-space: normal; }
  .hero-actions .secondary { grid-column: 2; grid-row: 1; }
  .virustotal-button { display: none; }
  .button { min-height: 44px; padding: 9px 13px; font-size: 14px; }
  section { padding: 28px 0; }
  h2 { margin-bottom: 16px; font-size: 25px; letter-spacing: -.35px; }
  h3 { font-size: 17px; }
  p { margin-bottom: 12px; }
  .grid, .info, .link-grid { grid-template-columns: 1fr; gap: 11px; }
  .card { padding: 16px; border-radius: 13px; }
  .page-head { padding: 34px 0 22px; }
  .page-head h1 { margin-bottom: 10px; font-size: clamp(30px, 9vw, 38px); line-height: 1.1; letter-spacing: -.8px; }
  .page-head p { font-size: 16.5px; line-height: 1.52; }
  .content section { padding: 20px 0; }
  .content section h2 { font-size: 25px; }
  .content ul, .content ol { padding-left: 21px; }
  .content li + li { margin-top: 5px; }
  .faq-list { gap: 8px; }
  .faq-layout, .version-layout { display: block; }
  .faq-sidebar, .version-sidebar { display: none; }
  .mobile-toc {
    position: fixed;
    bottom: calc(14px + env(safe-area-inset-bottom));
    left: 14px;
    z-index: 35;
    display: block;
  }
  .content .faq-group { padding-bottom: 34px; }
  .faq-list summary { padding: 14px 15px; font-size: 16px; }
  .faq-answer { padding: 0 15px 15px; font-size: 15.5px; line-height: 1.55; }
  .faq-answer code { padding: 1px 4px; font-size: .94em; }
  .release { padding: 16px; }
  .release-head { display: block; }
  .release-head h2 { margin-bottom: 4px; font-size: 25px; }
  .release time { display: block; margin-bottom: 12px; }
  .notice { padding: 14px 15px; }
  .feedback-actions { display: grid; grid-template-columns: 1fr; gap: 9px; margin-top: 20px; }
  footer { display: block; min-height: 0; margin-top: 30px; padding: 22px 0 calc(22px + env(safe-area-inset-bottom)); font-size: 14px; }
  footer nav { display: grid; grid-template-columns: repeat(2, minmax(0, max-content)); gap: 8px 18px; margin-top: 14px; }
  .back-to-top { right: 14px; bottom: calc(14px + env(safe-area-inset-bottom)); width: 44px; height: 44px; border-radius: 12px; }
  .back-to-top svg { width: 24px; height: 24px; }
  .not-found { min-height: calc(100vh - var(--header-height) - 110px); padding: 42px 0; }
}

@media (max-width: 360px) {
  .hero-actions { grid-template-columns: 1fr; }
  .hero-actions .secondary, .download-group .meta { grid-column: 1; }
  .hero-actions .secondary { grid-row: 2; }
  .download-group .meta { grid-row: 3; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .back-to-top, .nav, .mobile-toc-panel, .faq-list summary::after { transition: none; }
  .demo-caret { animation: none; }
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --bg: #181b20;
    --panel: #20242b;
    --field: #252a32;
    --text: #f4f6f8;
    --muted: #aab2be;
    --border: #3b424d;
    --accent-soft: #123457;
    --shadow: #0006;
    --shot-shadow: #0008;
    --warning: #3a2b18;
    --warning-text: #ffd39a;
  }
}