/* Qapptia — asymmetric composition; shared 4px spatial scale. */
:root {
  color-scheme: light;
  --bg-base: #f8fafc;
  --bg-surface: #fff;
  --bg-surface-elevated: #f1f5f9;
  --text-main: #0f172a;
  --text-muted: #475569;
  --text-dim: #526177;
  --primary: #4f46e5;
  --primary-hover: #4338ca;
  --accent-amber: #92400e;
  --accent-emerald: #166534;
  --border-subtle: #ccd3dd;
  --space-tight: 8px;
  --space-cluster: 16px;
  --space-row: 24px;
  --space-inset: 32px;
  --space-block: 48px;
  --space-section: 112px;
  --shell-gutter: clamp(20px, 4vw, 64px);
  --shell-max: 1440px;
  --radius-sm: 4px;
}
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html { scroll-behavior: smooth; scroll-padding-top: 104px; }
body {
  background: var(--bg-surface);
  color: var(--text-main);
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
::selection { color: #fff; background: var(--primary); }
* { scrollbar-color: #8793a4 var(--bg-surface-elevated); scrollbar-width: thin; }
a { color: inherit; text-underline-offset: 5px; }
button { color: inherit; font: inherit; cursor: pointer; }
img, picture { display: block; max-width: 100%; }
svg { flex-shrink: 0; vertical-align: middle; }
a, button, summary { -webkit-tap-highlight-color: transparent; }
:focus-visible { outline: 3px solid var(--primary); outline-offset: 5px; }
[hidden] { display: none !important; }
h1, h2, h3 { text-wrap: balance; }
p { max-width: 72ch; }
.container { width: min(100% - var(--shell-gutter) * 2, var(--shell-max)); margin-inline: auto; }
.ambient-grid { display: none; }
.text-emphasis, .text-emphasis-amber { color: inherit; }
.navbar { position: sticky; top: 0; z-index: 30; background: var(--bg-surface); }
.nav-pill {
  width: min(100% - var(--shell-gutter) * 2, var(--shell-max));
  min-height: 88px; margin-inline: auto; display: flex; padding: 16px 0;
  align-items: center; justify-content: space-between; gap: var(--space-row);
  border-bottom: 1px solid var(--border-subtle);
}
.nav-brand { display: inline-flex; align-items: center; gap: 12px; text-decoration: none; flex-shrink: 0; }
.nav-logo { width: 36px; height: 36px; }
.nav-logo img { width: 100%; height: 100%; object-fit: contain; }
.nav-title { display: flex; align-items: center; gap: 12px; font-size: 20px; font-weight: 800; letter-spacing: -.03em; }
.badge-version { color: var(--text-muted); font-size: 11px; font-weight: 500; letter-spacing: 0; font-variant-numeric: tabular-nums; overflow-wrap: anywhere; }
.nav-links { list-style: none; padding: 0; display: flex; gap: 24px; margin-inline: auto; font-size: 13px; font-weight: 600; }
.nav-links a { display: inline-flex; min-height: 44px; align-items: center; text-decoration: none; }
.nav-links a:hover { color: var(--primary); }
.nav-actions { display: flex; align-items: center; gap: 8px; }
.btn { display: inline-flex; min-height: 44px; justify-content: center; align-items: center; gap: 10px; padding: 10px 18px; border: 1px solid transparent; border-radius: var(--radius-sm); font-size: 13px; font-weight: 700; text-decoration: none; transition: background-color 160ms ease-out, color 160ms ease-out; }
.btn-primary { color: #fff; background: var(--primary); }
.btn-primary:hover { background: var(--primary-hover); }
.btn-secondary { border-color: var(--border-subtle); background: transparent; }
.btn-secondary:hover { background: var(--bg-surface-elevated); }
.btn-sponsor { color: var(--text-muted); background: transparent; }
.btn-sponsor:hover { color: var(--text-main); background: var(--bg-surface-elevated); }
.btn-lg { min-height: 56px; padding: 16px 22px; font-size: 14px; }
.nav-text-mobile { display: none; }
/* One reading spine: statement, action and real product evidence. */
.hero { padding-block: 76px 0; }
.hero > .container { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); column-gap: var(--space-block); align-items: start; }
.hero-title { font-size: clamp(44px, 4.8vw, 76px); line-height: 1.04; letter-spacing: -.04em; font-weight: 800; }
.hero-title > br { display: none; }
.hero-title .text-emphasis { display: block; max-width: 28ch; margin-top: 24px; font-size: clamp(20px, 1.75vw, 26px); line-height: 1.4; letter-spacing: -.02em; font-weight: 500; color: var(--text-muted); }
.hero-desc { grid-column: 1; font-size: 15px; color: var(--text-muted); margin-top: 24px; max-width: 47ch; }
.hero-cta { grid-column: 1; display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin-top: 28px; }
.hero-cta .btn-sponsor { padding-inline: 0; margin-left: 8px; font-size: 12px; }
.hero-copy { min-width: 0; }
.hero-image-wrapper { grid-column: 2; margin-top: 24px; align-self: center; }
.hero-image { width: 100%; height: auto; border-radius: 0; }
.hero-badges { grid-column: 1 / -1; display: flex; flex-wrap: wrap; gap: 16px 48px; margin-top: 64px; padding-block: 24px; border-block: 1px solid var(--border-subtle); }
.hero-badges > span { display: inline-flex; align-items: center; gap: 10px; font-size: 12px; font-weight: 600; }
.hero-badges svg { color: var(--accent-emerald); }
/* Open feature composition: one lead, supporting notes, no icon tiles. */
.section { padding-top: var(--space-section); scroll-margin-top: 104px; }
#features > .container { display: grid; grid-template-columns: minmax(0, 3fr) minmax(0, 8fr); gap: 0 7%; }
.section-head { align-self: start; }
.section-title { max-width: 12ch; font-size: clamp(32px, 3.4vw, 52px); line-height: 1.12; font-weight: 700; letter-spacing: -.035em; }
.section-tag { display: block; margin-top: 24px; padding-top: 12px; border-top: 1px solid var(--border-subtle); width: fit-content; color: var(--text-dim); font-size: 12px; }
.section-subtitle { margin-top: 20px; color: var(--text-muted); font-size: 14px; }
.features-grid { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr); column-gap: 48px; row-gap: 32px; }
.feature-card { min-width: 0; border-top: 1px solid var(--border-subtle); padding-top: 20px; }
.feature-card:first-child { grid-row: span 2; padding-top: 20px; padding-right: 24px; }
.card-icon { margin-bottom: 20px; color: var(--text-main); }
.feature-card h3 { font-size: 20px; letter-spacing: -.025em; line-height: 1.3; margin-bottom: 12px; }
.feature-card:first-child h3 { font-size: 32px; max-width: 12ch; }
.feature-card p { color: var(--text-muted); font-size: 14px; }
.feature-card:first-child p { font-size: 16px; }
.feature-card:last-child { grid-column: 1 / -1; display: grid; grid-template-columns: 24px minmax(0, 1fr) minmax(0, 2fr); gap: 20px; padding-block: 24px 0; align-items: start; }
.feature-card:last-child .card-icon, .feature-card:last-child h3 { margin: 0; }
.slide-nav-btn, .slide-dots-bar { display: none; }
/* The shortcut reference is deliberately denser than the narrative. */
.features-subblock { grid-column: 1 / -1; margin-top: 104px; padding: 48px; background: var(--text-main); color: #fff; display: grid; grid-template-columns: minmax(0, 3fr) minmax(0, 7fr); gap: 48px; }
.features-subblock .section-tag { color: #cbd5e1; border-color: #435065; }
.features-subblock .section-subtitle { color: #cbd5e1; max-width: 27ch; }
.section-title-sm { font-size: clamp(28px, 3vw, 40px); }
.shortcuts-container { min-width: 0; }
.shortcut-item { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 12px; padding: 18px 0; border-bottom: 1px solid #435065; }
.shortcut-item:first-child { padding-top: 0; }
.shortcut-info h3 { font-size: 14px; font-weight: 600; }
.shortcut-info p { color: #cbd5e1; font-size: 12px; margin-top: 4px; }
.badge-tag { display: inline-flex; align-items: center; padding: 3px 8px; border: 1px solid var(--border-subtle); border-radius: 3px; font-size: 11px; font-weight: 500; }
.shortcut-info .badge-tag { margin-left: 8px; border-color: #657389; color: #dbe3ee; font-size: 10px; }
.kbd-group { display: inline-flex; align-items: center; flex-wrap: wrap; gap: 6px; font-size: 12px; }
kbd { font-family: inherit; font-variant-numeric: tabular-nums; font-size: .8em; white-space: nowrap; border: 1px solid var(--border-subtle); border-radius: 3px; padding: 3px 6px; }
.kbd-group kbd { border-color: #657389; background: #263248; color: #fff; font-size: 12px; }
.shortcut-visual { padding-top: 32px; }
.shortcut-visual > .badge-tag { color: #bbf7d0; border-color: #526d68; margin-bottom: 16px; }
.shortcut-visual h3 { font-size: 18px; line-height: 1.4; margin-bottom: 12px; }
.shortcut-visual p { color: #cbd5e1; font-size: 13px; }
.shortcut-visual p + p { margin-top: 12px; }
/* Broad comparison, followed by an offset, quiet FAQ column. */
#comparison .section-head { display: flex; align-items: end; justify-content: space-between; gap: 32px; margin-bottom: 40px; }
#comparison .section-title { max-width: 20ch; }
#comparison .section-tag { margin: 0; min-width: 140px; }
.comparison-wrapper { max-width: 100%; overflow-x: auto; overscroll-behavior-inline: contain; }
.comparison-table { width: 100%; min-width: 820px; border-collapse: collapse; text-align: left; font-size: 13px; font-variant-numeric: tabular-nums; }
.comparison-table th { font-size: 12px; padding: 20px 24px; border-top: 1px solid var(--text-main); vertical-align: top; }
.comparison-table td { padding: 22px 24px; border-top: 1px solid var(--border-subtle); vertical-align: top; }
.comparison-table tr:last-child td { border-bottom: 1px solid var(--border-subtle); }
.comparison-table .col-highlight { background: var(--bg-surface-elevated); }
.comparison-table th.col-highlight { color: var(--primary); }
.check-icon { color: #166534; }
.cross-icon { color: #9f1239; }
#faq { padding-bottom: var(--space-section); }
#faq > .container { display: grid; grid-template-columns: minmax(0, 4fr) minmax(0, 7fr); gap: 8%; }
.faq-item { border-top: 1px solid var(--border-subtle); }
.faq-item:last-child { border-bottom: 1px solid var(--border-subtle); }
.faq-item summary { position: relative; padding: 24px 36px 24px 0; min-height: 64px; font-size: 15px; font-weight: 600; cursor: pointer; list-style: none; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: '+'; position: absolute; right: 0; top: 20px; font-size: 24px; font-weight: 400; color: var(--primary); }
.faq-item[open] summary::after { content: '−'; }
.faq-item p { padding: 0 36px 24px 0; color: var(--text-muted); font-size: 14px; }
/* Download: available software occupies the large working area. */
.download-page main, .sponsor-page main { padding-block: 72px 104px; }
.page-header { display: grid; grid-template-columns: minmax(0, 6fr) minmax(0, 4fr); gap: 10%; align-items: end; margin-bottom: 64px; }
.page-title { font-size: clamp(40px, 5.6vw, 80px); line-height: 1.04; letter-spacing: -.04em; font-weight: 800; }
.page-desc { color: var(--text-muted); font-size: 15px; }
.download-cards-grid { display: grid; grid-template-columns: minmax(0, 7fr) minmax(0, 4fr); gap: 0 8%; align-items: start; }
.download-card { min-width: 0; border-top: 1px solid var(--border-subtle); padding: 24px 0 32px; }
.card-windows { grid-row: span 2; border-top: 3px solid var(--primary); padding: 32px; background: var(--bg-base); }
.card-head { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 16px; margin-bottom: 28px; }
.card-os-title { display: flex; gap: 16px; align-items: center; }
.card-os-icon { color: var(--text-main); }
.card-os-name { font-size: 24px; font-weight: 700; line-height: 1.2; letter-spacing: -.025em; }
.card-windows .card-os-name { font-size: 40px; }
.card-os-sub { display: block; margin-top: 6px; font-size: 12px; color: var(--text-muted); }
.badge-os-pill { color: var(--text-muted); max-width: 100%; overflow-wrap: anywhere; }
.badge-version-pill { color: var(--primary); }
.card-main-btn { min-height: 52px; width: 100%; font-size: 14px; flex-wrap: wrap; }
.filesize-pill { padding-left: 12px; margin-left: auto; font-size: 11px; font-weight: 500; border-left: 1px solid #c7c3ff; font-variant-numeric: tabular-nums; }
.card-req-text { color: var(--text-muted); font-size: 12px; margin-top: 12px; }
.card-secondary-section { margin-top: 28px; }
.secondary-label { display: block; font-size: 10px; letter-spacing: .06em; color: var(--text-muted); margin-bottom: 10px; }
.dropdown-custom { position: relative; }
.dropdown-trigger { display: flex; justify-content: space-between; align-items: center; gap: 16px; padding: 14px 16px; min-height: 52px; width: 100%; text-align: left; border: 1px solid var(--border-subtle); border-radius: var(--radius-sm); background: var(--bg-surface); font-size: 13px; }
.dropdown-trigger:hover { border-color: var(--primary); }
.dropdown-chevron { transition: transform 160ms ease-out; }
.dropdown-custom.open .dropdown-chevron { transform: rotate(180deg); }
.dropdown-menu { display: none; border: 1px solid var(--border-subtle); border-top: 0; background: var(--bg-surface); padding: 8px; }
.dropdown-custom.open .dropdown-menu { display: block; }
.dropdown-item { display: flex; gap: 12px; align-items: center; min-height: 64px; padding: 12px 8px; text-decoration: none; border-radius: var(--radius-sm); }
.dropdown-item:hover { background: var(--bg-surface-elevated); }
.item-icon { width: 24px; text-align: center; }
.item-text { display: flex; flex-direction: column; gap: 4px; min-width: 0; }
.item-title { font-size: 13px; font-weight: 600; }
.item-sub { font-size: 11px; color: var(--text-muted); overflow-wrap: anywhere; }
.dropdown-divider { border-top: 1px solid var(--border-subtle); margin-block: 4px; }
.card-status-box { display: flex; align-items: start; gap: 8px; font-size: 12px; color: var(--text-muted); }
.status-indicator-dot { width: 6px; height: 6px; border-radius: 50%; background: #66768b; margin-top: 7px; flex-shrink: 0; }
.download-trust-banner { display: flex; align-items: center; justify-content: space-between; gap: 24px; padding-block: 28px; margin-top: 32px; border-block: 1px solid var(--border-subtle); font-size: 12px; }
.trust-badge-col { display: flex; align-items: center; gap: 12px; }
.trust-badge-col svg { color: var(--accent-emerald); }
.unified-links-group a { display: inline-flex; align-items: center; gap: 8px; min-height: 44px; font-weight: 600; }
.info-box { display: grid; grid-template-columns: minmax(0, 3fr) minmax(0, 7fr); gap: 8%; margin-top: 72px; }
.info-box h2 { font-size: 24px; line-height: 1.3; letter-spacing: -.025em; }
.specification-list { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.3fr); gap: 32px; font-size: 13px; color: var(--text-muted); }
.specification-list strong { display: block; color: var(--text-main); margin-bottom: 8px; }
/* Support is a directory of methods, rather than a pricing-card grid. */
.sponsor-page main > .container { display: grid; grid-template-columns: minmax(0, 4fr) minmax(0, 7fr); gap: 0 8%; align-items: start; }
.sponsor-page .page-header { display: block; margin: 0; }
.sponsor-page .page-title { max-width: 8ch; }
.sponsor-page .page-desc { margin-top: 32px; max-width: 32ch; }
.sponsor-options-grid { display: flex; flex-direction: column; }
.sponsor-tier-card { min-width: 0; border-top: 1px solid var(--border-subtle); }
.sponsor-tier-card:last-child { border-bottom: 1px solid var(--border-subtle); }
.sponsor-platform-heading { margin: 0; }
.sponsor-platform-toggle { display: grid; grid-template-columns: 36px minmax(0, 1fr) 20px; column-gap: 20px; align-items: center; width: 100%; min-height: 72px; padding: 16px 0; border: 0; background: transparent; color: var(--text-main); text-align: left; }
.sponsor-platform-toggle:hover { background: var(--bg-base); }
.sponsor-platform-toggle:active { background: var(--bg-surface-elevated); }
.sponsor-platform-toggle:focus-visible { outline: 3px solid var(--primary); outline-offset: -3px; }
.sponsor-icon-box { display: flex; align-items: center; }
.sponsor-card-title { font-size: 20px; font-weight: 700; line-height: 1.3; letter-spacing: -.025em; }
.sponsor-platform-label { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 12px; min-width: 0; }
.payment-methods { display: inline-flex; flex-shrink: 0; align-items: center; gap: 4px; }
.payment-method { display: inline-flex; align-items: center; justify-content: center; width: 24px; height: 24px; }
.payment-method img { display: block; width: 20px; height: 20px; object-fit: contain; }
.payment-method-yape { width: 32px; height: 32px; }
.payment-method-yape img { width: 32px; height: 32px; }
.payment-method-applepay { width: 36px; }
.payment-method-applepay img { width: 36px; }
.sponsor-chevron { color: var(--text-muted); transition: transform 160ms ease-out; }
.sponsor-tier-card.is-expanded .sponsor-chevron { transform: rotate(180deg); }
.sponsor-platform-panel { min-width: 0; padding: 0 0 24px 56px; }
.tier-tag { display: block; font-size: 12px; color: var(--text-muted); }
.btn-sponsor-action { display: inline-flex; align-items: center; justify-content: space-between; gap: 12px; min-height: 44px; width: 108px; margin-top: 16px; padding: 8px 0; font-size: 13px; font-weight: 700; text-decoration: none; border-bottom: 1px solid var(--text-main); }
.btn-sponsor-action:hover { color: var(--primary); border-color: var(--primary); }
.mercadopago-donations { margin-top: 16px; min-width: 0; }
.donation-currency { margin-bottom: 8px; font-size: 12px; color: var(--text-muted); }
.donation-amounts { display: flex; flex-wrap: wrap; gap: 8px; }
.donation-amount { display: inline-flex; flex: 1 0 72px; align-items: center; justify-content: center; min-height: 48px; padding: 8px 16px; border: 1px solid var(--border-subtle); border-radius: var(--radius-sm); background: var(--bg-surface); color: var(--text-main); font-size: 13px; font-weight: 700; font-variant-numeric: tabular-nums; white-space: nowrap; text-decoration: none; }
.donation-amount[href]:hover { border-color: var(--primary); color: var(--primary); background: var(--bg-base); }
.donation-amount[href]:active { border-color: var(--primary-hover); color: #fff; background: var(--primary-hover); }
.donation-amount:focus-visible { outline: 3px solid var(--primary); outline-offset: 3px; }
.donation-amount[aria-disabled="true"] { cursor: not-allowed; color: var(--text-muted); background: var(--bg-surface-elevated); }
.donation-symbol { margin-right: 8px; color: var(--text-dim); font-size: 11px; font-weight: 500; }
.donation-value { color: var(--text-main); font-size: 15px; font-weight: 700; }
.donation-amount[href]:hover .donation-value { color: var(--primary); }
.donation-amount[href]:active .donation-value { color: inherit; }
.donation-amount[href]:active .donation-symbol { color: #e0e7ff; }
.donation-pending { margin-top: 8px; font-size: 12px; color: var(--text-muted); }
.paypal-support { display: grid; grid-template-columns: minmax(0, 1fr) 128px; align-items: center; gap: 16px; width: fit-content; max-width: 100%; margin-top: 16px; }
.paypal-qr { display: grid; place-items: center; width: 128px; height: 128px; padding: 8px; border: 1px solid var(--border-subtle); background: #fff; }
.paypal-qr img { width: 112px; height: 112px; max-width: 100%; object-fit: contain; }
.paypal-qr-placeholder { color: var(--text-muted); font-size: 12px; text-align: center; }
.paypal-qr.has-qr .paypal-qr-placeholder { display: none; }
.paypal-support-button { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 48px; max-width: 100%; padding: 8px 24px; border-radius: var(--radius-sm); background: #0070ba; color: #fff; font-size: 14px; font-weight: 600; text-decoration: none; }
.paypal-support-button:hover { background: #005ea6; }
.paypal-support-button:active { background: #003087; }
.paypal-support-button:focus-visible { outline: 3px solid #003087; outline-offset: 4px; }
.paypal-wordmark { font-family: Arial, Helvetica, sans-serif; font-size: 19px; font-style: italic; font-weight: 800; letter-spacing: -.025em; }
.sponsor-appreciation-box { grid-column: 1 / -1; display: flex; gap: 24px; margin-top: 80px; padding: 32px 0; border-top: 1px solid var(--border-subtle); }
.appreciation-icon { font-size: 24px; }
.appreciation-content h2 { font-size: 18px; margin-bottom: 12px; letter-spacing: -.02em; }
.appreciation-content p { font-size: 14px; color: var(--text-muted); }
.footer { padding-block: 32px; border-top: 1px solid var(--border-subtle); background: var(--bg-base); }
.footer-inner { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 24px; }
.footer .nav-logo { width: 28px; height: 28px; }
.footer .nav-brand > span { font-size: 17px; font-weight: 800; }
.footer-copy { font-size: 11px; color: var(--text-muted); }
@media (min-width: 1600px) { .hero-title { max-width: 9ch; } }
@media (max-width: 1120px) {
  .nav-links { display: none; }
  .nav-title { flex-direction: column; align-items: start; gap: 0; }
  .hero > .container { column-gap: 32px; }
  .hero-title { font-size: clamp(40px, 5vw, 58px); }
  .hero-image-wrapper { margin-top: 0; }
  .hero-cta .btn-sponsor { margin-left: 0; }
  .features-subblock { gap: 32px; padding: 32px; }
  .features-grid { column-gap: 32px; }
}
@media (max-width: 800px) {
  :root { --space-section: 80px; }
  .hero { padding-top: 48px; }
  .hero > .container { grid-template-columns: minmax(0, 1fr); }
  .hero-title { max-width: 14ch; font-size: clamp(44px, 7.7vw, 64px); }
  .hero-title .text-emphasis { max-width: 28ch; font-size: 21px; }
  .hero-desc { max-width: 60ch; }
  .hero-image-wrapper { grid-column: 1; grid-row: auto; margin-top: 40px; }
  .hero-badges { margin-top: 32px; gap: 12px 24px; }
  #features > .container { grid-template-columns: minmax(0, 1fr); }
  #features > .container > .section-head { margin-bottom: 40px; }
  .section-title { max-width: 20ch; }
  .section-tag { margin-top: 16px; }
  .features-subblock { margin-top: 64px; grid-template-columns: minmax(0, 1fr); gap: 32px; }
  .features-subblock .section-subtitle { max-width: 48ch; }
  #faq > .container { grid-template-columns: minmax(0, 1fr); gap: 40px; }
  .download-page main, .sponsor-page main { padding-top: 48px; padding-bottom: 80px; }
  .page-header { grid-template-columns: minmax(0, 1fr); gap: 24px; margin-bottom: 48px; }
  .page-title { max-width: 14ch; font-size: 52px; }
  .page-desc { max-width: 60ch; }
  .download-cards-grid { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 40px 32px; }
  .card-windows { grid-column: 1 / -1; grid-row: auto; }
  .card-head { gap: 12px; }
  .info-box { grid-template-columns: minmax(0, 1fr); gap: 32px; margin-top: 56px; }
  .sponsor-page main > .container { grid-template-columns: minmax(0, 1fr); gap: 48px; }
  .sponsor-page .page-title { max-width: 14ch; }
  .sponsor-page .page-desc { max-width: 55ch; margin-top: 24px; }
  .sponsor-appreciation-box { margin-top: 0; }
}
@media (max-width: 520px) {
  :root { --shell-gutter: 20px; --space-section: 64px; }
  .nav-pill { min-height: 100px; flex-wrap: wrap; gap: 4px 12px; padding-block: 12px 8px; }
  .nav-title { flex-direction: row; align-items: center; gap: 10px; }
  .nav-brand { gap: 8px; }
  .nav-logo { width: 28px; height: 28px; }
  .nav-title { font-size: 18px; }
  .badge-version { font-size: 10px; }
  .nav-actions { width: 100%; justify-content: space-between; gap: 8px; }
  .nav-actions .btn { padding: 8px 12px; min-height: 44px; font-size: 12px; }
  .nav-actions .btn-sponsor { margin-left: auto; }
  .hero { padding-top: 36px; }
  .hero-title { font-size: clamp(40px, 11.5vw, 56px); max-width: 12ch; }
  .hero-title .text-emphasis { font-size: 19px; margin-top: 20px; }
  .hero-desc { font-size: 14px; margin-top: 20px; }
  .hero-cta { margin-top: 24px; align-items: start; flex-direction: column; gap: 4px; }
  .hero-cta .btn-primary { width: 100%; }
  .hero-cta .btn-sponsor { min-height: 44px; }
  .hero-image-wrapper { margin-top: 24px; }
  .hero-badges { gap: 12px; margin-top: 24px; padding-block: 20px; }
  .hero-badges > span { width: 100%; }
  .section-title { font-size: 34px; }
  .features-grid { display: block; }
  .feature-card, .feature-card:first-child { padding: 24px 0; }
  .feature-card:first-child h3 { max-width: none; font-size: 28px; }
  .feature-card:first-child p { font-size: 14px; }
  .feature-card:last-child { display: block; padding-block: 24px 0; }
  .feature-card:last-child .card-icon { margin-bottom: 20px; }
  .feature-card:last-child h3 { margin-bottom: 12px; }
  .features-subblock { margin-top: 48px; padding: 28px 20px; }
  .shortcut-item { gap: 12px; }
  .shortcut-info { flex-basis: 100%; }
  .kbd-group { margin-bottom: 4px; }
  #comparison .section-head { display: block; margin-bottom: 28px; }
  #comparison .section-tag { margin-top: 20px; min-width: 0; }
  .comparison-table th, .comparison-table td { padding: 18px; }
  .page-title { font-size: 44px; }
  .download-cards-grid { display: flex; flex-direction: column; gap: 28px; }
  .download-card { width: 100%; }
  .card-windows { padding: 24px 20px; }
  .card-windows .card-os-name { font-size: 32px; }
  .card-head { margin-bottom: 24px; }
  .card-main-btn { padding-inline: 12px; font-size: 13px; }
  .download-trust-banner { align-items: start; flex-direction: column; gap: 12px; }
  .trust-badge-col { align-items: start; }
  .specification-list { grid-template-columns: minmax(0, 1fr); gap: 24px; }
  .sponsor-platform-toggle { grid-template-columns: 28px minmax(0, 1fr) 20px; column-gap: 12px; }
  .sponsor-platform-panel { padding-left: 40px; }
  .sponsor-card-title { font-size: 18px; }
  .donation-amounts { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .donation-amount { padding-inline: 8px; }
  .donation-amount:last-child { grid-column: 1 / -1; }
  .paypal-support { width: 100%; grid-template-columns: minmax(0, 1fr) 112px; }
  .paypal-support-button { padding-inline: 16px; }
  .paypal-qr { width: 112px; height: 112px; }
  .paypal-qr img { width: 96px; height: 96px; }
  .sponsor-appreciation-box { gap: 16px; }
  .appreciation-content h2 { font-size: 17px; }
  .footer-inner { gap: 16px; }
  .footer-copy { max-width: 38ch; }
}
@media (max-width: 360px) {
  .paypal-support-button { flex-direction: column; gap: 0; padding: 8px; }
  .nav-actions { gap: 4px; }
  .nav-actions .btn { padding-inline: 8px; gap: 6px; font-size: 11px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
}