:root {
  --navy: #123b64;
  --navy-dark: #0a2947;
  --blue-soft: #eaf2f7;
  --orange: #c2410c;
  --orange-dark: #9a3412;
  --ink: #1f2931;
  --muted: #64727d;
  --line: #cbd5dc;
  --paper: #ffffff;
  --gray: #f3f5f6;
  --max: 1220px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: Arial, Helvetica, sans-serif; font-size: 16px; line-height: 1.65; }
body.viewer-open { overflow: hidden; }
a { color: inherit; }
img { display: block; max-width: 100%; height: auto; }
button, input { font: inherit; }

.site-header { position: relative; z-index: 20; display: flex; align-items: center; justify-content: space-between; min-height: 80px; padding: 0 max(24px, calc((100vw - var(--max)) / 2)); background: #fff; border-bottom: 1px solid #e8edf0; }
.brand { display: inline-flex; align-items: center; gap: 13px; text-decoration: none; }
.brand-mark { display: grid; place-items: center; width: 52px; height: 52px; color: #fff; background: var(--orange); font-size: 16px; font-weight: 700; letter-spacing: -.04em; }
.brand-name { color: #252a2f; font-size: 25px; font-weight: 700; letter-spacing: -.05em; }
.brand-name span { font-weight: 400; }
.main-nav { display: flex; align-items: center; gap: 34px; }
.main-nav a { position: relative; padding: 28px 0 24px; color: #1b2025; text-decoration: none; font-size: 14px; font-weight: 700; letter-spacing: .02em; }
.main-nav a:hover, .main-nav a[aria-current="page"] { color: var(--orange); }
.main-nav a[aria-current="page"]::after { content: ""; position: absolute; right: 0; bottom: 0; left: 0; height: 3px; background: var(--orange); }
.nav-toggle { display: none; padding: 8px 10px; color: var(--navy-dark); background: transparent; border: 1px solid var(--line); font-size: 14px; font-weight: 700; letter-spacing: .03em; }

.eyebrow, .product-index, .section-number { margin: 0 0 17px; color: var(--orange); font-size: 13px; font-weight: 700; letter-spacing: .075em; text-transform: uppercase; }
.home-hero { position: relative; min-height: 520px; overflow: hidden; color: #fff; background: var(--navy); }
.home-hero::after { content: ""; position: absolute; z-index: 1; inset: 0; background: linear-gradient(90deg, rgba(8,35,61,.99), rgba(8,35,61,.92) 44%, rgba(8,35,61,.16) 70%, rgba(8,35,61,.02)); }
.home-hero .eyebrow, .product-hero .eyebrow { color: #ffb38f; }
.hero-kitten { position: absolute; z-index: 0; top: 0; right: 0; width: auto; max-width: none; height: 100%; object-fit: contain; object-position: right center; }
.protocol-field { position: absolute; z-index: 2; top: -30px; bottom: -30px; left: -35px; display: grid; width: 55%; grid-template-columns: repeat(2, 1fr); grid-auto-rows: 145px; align-items: center; opacity: .17; transform: rotate(-3deg) scale(1.05); }
.protocol-field span { display: grid; place-items: center; height: 100%; color: #c7dceb; border: 1px solid rgba(255,255,255,.14); font-size: clamp(22px, 3vw, 42px); font-weight: 700; }
.hero-copy { position: relative; z-index: 3; max-width: var(--max); margin: 0 auto; padding: 86px 24px 80px; }
.hero-copy h1 { max-width: 850px; margin: 0; font-size: clamp(48px, 6vw, 76px); font-weight: 400; line-height: 1.05; letter-spacing: -.04em; }
.hero-copy > p:not(.eyebrow) { max-width: 690px; margin: 24px 0 0; color: #d7e4ed; font-size: 20px; }
.text-link { display: inline-flex; align-items: center; gap: 14px; margin-top: 34px; text-decoration: none; font-size: 14px; font-weight: 700; letter-spacing: .045em; }
.text-link span, .primary-link span { color: var(--orange); font-size: 18px; line-height: 1; }
.text-link.light { color: #fff; }

.statement { max-width: 980px; margin: 0 auto; padding: 94px 24px 100px; text-align: center; }
.statement h2 { margin: 0; color: var(--navy-dark); font-size: clamp(35px, 4.5vw, 54px); font-weight: 400; line-height: 1.16; letter-spacing: -.03em; }
.product-row { display: grid; grid-template-columns: .84fr 1.16fr; align-items: center; gap: clamp(50px, 7vw, 105px); padding: 104px max(24px, calc((100vw - var(--max)) / 2)); }
.product-row.reverse { grid-template-columns: 1.16fr .84fr; }
.product-row.reverse .product-summary { order: 2; }
.product-row.reverse .image-trigger { order: 1; }
.tint-blue { background: var(--blue-soft); }
.tint-gray { background: var(--gray); }
.product-summary h2 { margin: 0; color: var(--navy-dark); font-size: clamp(38px, 4.5vw, 58px); font-weight: 400; line-height: 1.08; letter-spacing: -.035em; }
.product-summary .lead { margin: 24px 0 0; color: var(--navy); font-size: 23px; line-height: 1.42; }
.product-summary > p:not(.product-index):not(.lead) { margin: 17px 0 0; color: var(--muted); }
.quick-facts { display: grid; gap: 0; margin: 31px 0 0; border-top: 1px solid var(--line); }
.quick-facts > span { padding: 9px 0; color: #56636d; border-bottom: 1px solid var(--line); font-size: 13px; font-weight: 700; text-transform: uppercase; letter-spacing: .035em; }
.quick-facts [data-version] { padding: 0; border: 0; font: inherit; letter-spacing: inherit; }
.primary-link { display: inline-flex; align-items: center; gap: 13px; margin-top: 28px; color: var(--navy-dark); text-decoration: none; font-size: 14px; font-weight: 700; letter-spacing: .04em; }

.image-trigger, .product-image-link { position: relative; display: block; width: 100%; margin: 0; padding: 0; overflow: hidden; color: inherit; background: transparent; border: 0; }
.image-trigger { cursor: zoom-in; }
.product-image-link { cursor: pointer; }
.image-trigger img, .product-image-link img { width: 100%; margin: 0 auto; transition: transform .2s ease; }
.image-trigger:hover img, .product-image-link:hover img { transform: scale(1.006); }
.image-trigger > span, .product-image-link > span { position: absolute; right: 12px; bottom: 12px; padding: 8px 11px; color: #fff; background: rgba(10,41,71,.94); font-size: 13px; font-weight: 700; letter-spacing: .035em; pointer-events: none; }
.image-trigger:focus-visible, .product-image-link:focus-visible { outline: 4px solid var(--orange); outline-offset: 4px; }
.image-trigger.compact img { max-width: 930px; }

.principles { display: grid; grid-template-columns: .85fr 1.15fr; gap: 90px; padding: 94px max(24px, calc((100vw - var(--max)) / 2)); border-top: 5px solid var(--orange); }
.principles h2, .edition-band h2, .privacy-band h2 { margin: 0; color: var(--navy-dark); font-size: clamp(34px, 4vw, 50px); font-weight: 400; line-height: 1.15; letter-spacing: -.025em; }
.principle-list { color: var(--muted); font-size: 17px; }
.principle-list p { margin: 0; padding: 0 0 19px 25px; border-left: 1px solid var(--line); }
.principle-list p + p { padding-top: 19px; }
.principle-list b { color: var(--navy-dark); }

.product-hero { display: grid; grid-template-columns: minmax(0, 1.45fr) minmax(240px, .55fr); align-items: end; min-height: 500px; padding: 82px max(24px, calc((100vw - var(--max)) / 2)); color: #fff; background: var(--navy); }
.core-hero { background: linear-gradient(135deg, #0b2948 0%, #174c78 70%, #286b94 100%); }
.workbench-hero { background: linear-gradient(135deg, #102d49 0%, #28495f 70%, #4e6777 100%); }
.karat-hero { background: linear-gradient(135deg, #132f4b 0%, #163f66 64%, #e45b26 170%); }
.downloads-hero { min-height: 430px; background: linear-gradient(135deg, #0b2948 0%, #174c78 75%, #286b94 100%); }
.product-hero-copy h1 { max-width: 880px; margin: 0; font-size: clamp(46px, 5.8vw, 72px); font-weight: 400; line-height: 1.06; letter-spacing: -.04em; }
.product-hero-copy > p:not(.eyebrow):not(.cta-note) { max-width: 760px; margin: 24px 0 0; color: #d6e4ee; font-size: 20px; }
.hero-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 12px; margin-top: 31px; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 47px; padding: 11px 17px; border: 1px solid transparent; text-decoration: none; font-size: 14px; font-weight: 700; letter-spacing: .035em; cursor: pointer; }
.button.primary { color: #fff; background: var(--orange); }
.button.primary:hover { background: var(--orange-dark); }
.button.secondary { color: #fff; background: transparent; border-color: rgba(255,255,255,.55); }
.button.secondary:hover { border-color: var(--orange); }
.button.dark-outline { color: var(--navy-dark); border-color: var(--navy-dark); }
.button.text-button { padding-right: 3px; padding-left: 3px; color: var(--navy-dark); background: transparent; }
.button:focus-visible, .primary-link:focus-visible, .text-link:focus-visible { outline: 3px solid var(--orange); outline-offset: 3px; }
.cta-note { margin: 17px 0 0; color: #d2e0ea; font-size: 14px; }
.signal-list { display: grid; grid-template-columns: repeat(2, minmax(100px, 1fr)); align-self: stretch; margin-left: 55px; border-top: 1px solid rgba(255,255,255,.22); border-left: 1px solid rgba(255,255,255,.22); }
.signal-list span { display: grid; place-items: center; min-height: 100px; color: #dbe8f0; border-right: 1px solid rgba(255,255,255,.22); border-bottom: 1px solid rgba(255,255,255,.22); font-size: 13px; font-weight: 700; text-align: center; }

.feature-intro { display: grid; grid-template-columns: .35fr 1fr; gap: 60px; max-width: var(--max); margin: 0 auto; padding: 92px 24px 100px; }
.feature-intro h2, .media-copy h2, .feature-split h2, .preset-section h2, .free-band h2, .donation-copy h2 { margin: 0; color: var(--navy-dark); font-size: clamp(35px, 4.5vw, 54px); font-weight: 400; line-height: 1.14; letter-spacing: -.03em; }
.feature-intro div > p { max-width: 790px; margin: 23px 0 0; color: var(--muted); font-size: 18px; }
.media-section { display: grid; grid-template-columns: minmax(0, 1.38fr) minmax(300px, .62fr); align-items: center; gap: clamp(48px, 6.5vw, 92px); padding: 100px max(24px, calc((100vw - var(--max)) / 2)); }
.media-section.reverse { grid-template-columns: minmax(300px, .62fr) minmax(0, 1.38fr); }
.media-section.reverse .image-trigger { order: 2; }
.media-section.reverse .media-copy { order: 1; }
.media-copy > p:not(.section-number) { margin: 22px 0 0; color: var(--muted); font-size: 17px; }
.clean-list { margin: 27px 0 0; padding: 0; list-style: none; border-top: 1px solid var(--line); }
.clean-list li { position: relative; padding: 11px 0 11px 20px; color: #53616b; border-bottom: 1px solid var(--line); font-size: 14px; }
.clean-list li::before { content: ""; position: absolute; top: 20px; left: 0; width: 7px; height: 2px; background: var(--orange); }

.feature-split { display: grid; grid-template-columns: .84fr 1.16fr; gap: 80px; max-width: var(--max); margin: 0 auto; padding: 100px 24px; }
.feature-split > div:first-child > p:not(.section-number) { margin: 22px 0 0; color: var(--muted); font-size: 17px; }
.metric-grid { display: grid; grid-template-columns: repeat(2, 1fr); border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.metric-grid div { min-height: 150px; padding: 25px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.metric-grid b, .metric-grid span { display: block; }
.metric-grid b { color: var(--orange); font-size: 13px; letter-spacing: .045em; }
.metric-grid span { margin-top: 10px; color: var(--navy-dark); font-size: 16px; line-height: 1.45; }

.privacy-band, .edition-band { display: grid; grid-template-columns: .9fr 1.1fr; gap: 90px; padding: 94px max(24px, calc((100vw - var(--max)) / 2)); }
.privacy-band { padding-top: 78px; padding-bottom: 78px; color: var(--ink); background: linear-gradient(90deg, #eaf2f7, #f7f9fa); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.privacy-band h2 { color: var(--navy-dark); }
.privacy-band > div:last-child { font-size: 17px; }
.privacy-band > div:last-child p:first-child { margin-top: 4px; }
.privacy-band b { color: var(--navy-dark); }
.edition-band { border-top: 5px solid var(--orange); }
.edition-band > div:last-child > p { margin-top: 4px; color: var(--muted); font-size: 17px; }

.preset-section { display: grid; grid-template-columns: .85fr 1.15fr; gap: 80px; max-width: var(--max); margin: 0 auto; padding: 100px 24px; }
.preset-section > div:first-child > p:not(.section-number) { margin: 22px 0 0; color: var(--muted); }
.preset-section code { display: inline-block; margin-top: 22px; padding: 10px 13px; color: #dbe7ef; background: var(--navy-dark); font: 14px/1.4 Consolas, Monaco, monospace; }
.preset-grid { display: grid; grid-template-columns: repeat(2, 1fr); align-content: start; border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.preset-grid span { padding: 15px 18px; color: var(--navy-dark); border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); font-size: 13px; font-weight: 700; }
.free-band { padding: 74px max(24px, calc((100vw - 980px) / 2)); color: var(--ink); background: var(--blue-soft); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); text-align: center; }
.free-band h2 { color: var(--navy-dark); }
.free-band > p:not(.eyebrow) { max-width: 780px; margin: 23px auto 29px; color: var(--muted); font-size: 18px; }

.edition-section, .technical-section { padding: 96px max(24px, calc((100vw - var(--max)) / 2)); }
.edition-section { background: var(--blue-soft); border-top: 5px solid var(--orange); }
.section-heading { display: grid; grid-template-columns: 1fr .75fr; gap: 70px; align-items: end; margin-bottom: 38px; }
.section-heading h2, .technical-intro h2 { margin: 0; color: var(--navy-dark); font-size: clamp(35px, 4.5vw, 54px); font-weight: 400; line-height: 1.14; letter-spacing: -.03em; }
.section-heading p, .technical-intro > p:not(.section-number) { margin: 0; color: var(--muted); font-size: 17px; }
.table-scroll { max-width: 100%; overflow-x: auto; border: 1px solid var(--line); background: #fff; }
.table-scroll:focus-visible { outline: 4px solid var(--orange); outline-offset: 3px; }
.comparison-table, .download-table { width: 100%; border-collapse: collapse; text-align: left; }
.comparison-table { min-width: 720px; }
.comparison-table th, .comparison-table td, .download-table th, .download-table td { padding: 15px 17px; vertical-align: top; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.comparison-table tr > *:last-child, .download-table tr > *:last-child { border-right: 0; }
.comparison-table tbody tr:last-child > *, .download-table tbody tr:last-child > * { border-bottom: 0; }
.comparison-table thead th, .download-table thead th { color: #fff; background: var(--navy-dark); font-size: 14px; letter-spacing: .02em; }
.comparison-table tbody th { width: 29%; color: var(--navy-dark); background: #f6f8f9; font-size: 14px; }
.comparison-table td { color: #475761; font-size: 14px; }
.detailed-comparison tbody tr:nth-child(even) td { background: #f7f9fa; }
.comparison-scroll { max-height: 690px; overflow: auto; }
.comparison-scroll thead { position: sticky; top: 0; z-index: 1; }
.edition-actions { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; margin-top: 32px; background: var(--line); border: 1px solid var(--line); }
.edition-actions > div { padding: 28px; background: #fff; }
.edition-actions h3, .technical-grid h3 { margin: 0; color: var(--navy-dark); font-size: 22px; }
.edition-actions p { margin: 10px 0 21px; color: var(--muted); }
.technical-section { background: #fff; }
.technical-intro { display: grid; grid-template-columns: .38fr 1fr; gap: 22px 70px; align-items: start; margin-bottom: 42px; }
.technical-intro .section-number { grid-row: 1 / 3; }
.technical-grid { display: grid; grid-template-columns: .62fr 1.38fr; gap: 60px; align-items: start; }
.spec-list dl { margin: 18px 0 0; border-top: 1px solid var(--line); }
.spec-list dt { padding-top: 13px; color: var(--navy-dark); font-size: 14px; font-weight: 700; }
.spec-list dd { margin: 1px 0 0; padding: 0 0 13px; color: var(--muted); border-bottom: 1px solid var(--line); font-size: 14px; }
.download-table { min-width: 700px; margin-top: 15px; }
.download-table td { color: #475761; font-size: 13px; }
.download-table td:first-child { width: 27%; color: var(--navy-dark); font-weight: 700; }
.download-table code, .comparison-table code { font-family: Consolas, Monaco, monospace; font-size: .92em; overflow-wrap: anywhere; word-break: break-all; }
.legal-note { margin: 16px 0 0; color: var(--muted); font-size: 13px; }
.legal-note a { color: var(--navy); }

.downloads-section { padding: 96px max(24px, calc((100vw - var(--max)) / 2)); background: var(--gray); }
.downloads-intro { display: grid; grid-template-columns: .35fr 1fr; gap: 60px; margin-bottom: 42px; }
.downloads-intro h2 { margin: 0; color: var(--navy-dark); font-size: clamp(35px, 4.5vw, 54px); font-weight: 400; line-height: 1.14; letter-spacing: -.03em; }
.downloads-intro div > p { max-width: 780px; margin: 18px 0 0; color: var(--muted); font-size: 17px; }
.download-cards { display: grid; gap: 22px; }
.download-card { scroll-margin-top: 20px; padding: 34px; background: #fff; border: 1px solid var(--line); border-top: 5px solid var(--navy); }
.download-card:target { border-top-color: var(--orange); box-shadow: 0 0 0 3px rgba(194,65,12,.14); }
.download-card-heading { display: grid; grid-template-columns: 1fr auto; align-items: end; gap: 4px 30px; padding-bottom: 23px; border-bottom: 1px solid var(--line); }
.download-card-heading .product-index { grid-column: 1 / -1; margin-bottom: 5px; }
.download-card-heading h2 { margin: 0; color: var(--navy-dark); font-size: clamp(29px, 3.5vw, 42px); font-weight: 400; line-height: 1.15; letter-spacing: -.025em; }
.download-card-heading > p:last-child { margin: 0; color: var(--muted); font-size: 14px; font-weight: 700; }
.host-options { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; margin-top: 24px; background: var(--line); border: 1px solid var(--line); }
.host-option { padding: 24px; background: #fff; }
.host-option.primary-host { background: var(--blue-soft); }
.host-label { color: var(--navy-dark); font-size: 13px; font-weight: 700; letter-spacing: .045em; }
.host-option p { margin: 7px 0 17px; color: var(--muted); font-size: 14px; }
.download-details-link { display: inline-block; margin-top: 23px; color: var(--navy-dark); font-size: 14px; font-weight: 700; letter-spacing: .035em; text-decoration-color: var(--orange); text-underline-offset: 4px; }
.download-help { margin: 28px 0 0; color: var(--muted); text-align: center; }
.download-help a { color: var(--navy-dark); font-weight: 700; }

.donation-section { display: grid; grid-template-columns: 1fr .82fr; align-items: start; gap: 85px; padding: 100px max(24px, calc((100vw - var(--max)) / 2)); background: var(--gray); }
.donation-copy > p:not(.eyebrow):not(.donation-assurance) { margin: 22px 0 0; color: var(--muted); font-size: 17px; }
.donation-assurance { margin-top: 20px; color: var(--navy-dark); font-weight: 700; }
.donation-panel { padding: 30px; background: #fff; border-top: 5px solid var(--orange); }
.donation-panel fieldset { margin: 0; padding: 0; border: 0; }
.donation-panel legend, .custom-amount { color: var(--navy-dark); font-size: 14px; font-weight: 700; letter-spacing: .03em; text-transform: uppercase; }
.amount-options { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin-top: 13px; }
.amount-options input { position: absolute; opacity: 0; pointer-events: none; }
.amount-options span { display: grid; place-items: center; min-height: 46px; color: var(--navy-dark); background: #f2f5f6; border: 1px solid var(--line); font-size: 14px; font-weight: 700; cursor: pointer; }
.amount-options input:checked + span { color: #fff; background: var(--navy); border-color: var(--navy); }
.amount-options input:focus-visible + span { outline: 3px solid var(--orange); outline-offset: 2px; }
.custom-amount { display: block; margin-top: 24px; }
#custom-amount { width: 100%; height: 46px; margin-top: 8px; padding: 8px 12px; color: var(--ink); background: #fff; border: 1px solid var(--line); }
#custom-amount:disabled { color: #8a969e; background: #edf1f3; }
.donation-button { width: 100%; margin-top: 18px; color: #7d8991; background: #dfe5e8; border: 0; cursor: not-allowed; }
.donation-button.enabled { color: #fff; background: var(--orange); cursor: pointer; }
.donation-status { margin: 11px 0 0; color: var(--muted); font-size: 14px; text-align: center; }

.site-footer { display: grid; grid-template-columns: 1fr auto auto; align-items: center; gap: 40px; padding: 42px max(24px, calc((100vw - var(--max)) / 2)); color: #c7d1d9; background: var(--navy-dark); font-size: 14px; }
.site-footer p { margin: 0; }
.site-footer p a { color: #fff; text-underline-offset: 3px; }
.footer-brand .brand-name { color: #fff; }
.footer-brand .brand-mark { width: 42px; height: 42px; }

.image-viewer { width: min(96vw, 1700px); max-width: none; height: 94vh; max-height: none; margin: auto; padding: 0; overflow: hidden; color: #fff; background: #071a2a; border: 0; }
.image-viewer::backdrop { background: rgba(2,10,17,.9); }
.viewer-toolbar { display: flex; align-items: center; justify-content: space-between; min-height: 58px; gap: 24px; padding: 10px 16px; border-bottom: 1px solid rgba(255,255,255,.16); }
.viewer-toolbar p { margin: 0; color: #dce7f0; font-size: 13px; }
.viewer-actions { display: flex; align-items: center; gap: 9px; flex: 0 0 auto; }
.viewer-actions button, .viewer-actions a { display: inline-flex; align-items: center; min-height: 38px; padding: 7px 11px; color: #fff; background: transparent; border: 1px solid rgba(255,255,255,.44); text-decoration: none; font: 700 13px/1 Arial, Helvetica, sans-serif; letter-spacing: .025em; cursor: pointer; }
.viewer-actions button:hover, .viewer-actions a:hover { color: #ffd8c8; border-color: var(--orange); }
.viewer-stage { height: calc(94vh - 58px); padding: 18px; overflow: auto; text-align: center; }
.viewer-stage img { display: inline-block; max-width: none; width: auto; height: auto; vertical-align: top; }
.viewer-stage img.is-fit { max-width: 100%; max-height: calc(94vh - 94px); }

@media (max-width: 980px) {
  .hero-kitten { display: none; }
  .protocol-field { right: -35px; width: auto; grid-template-columns: repeat(4, 1fr); opacity: .23; }
  .home-hero::after { background: linear-gradient(90deg, rgba(8,35,61,.98), rgba(8,35,61,.86) 52%, rgba(8,35,61,.25)); }
  .product-row, .product-row.reverse, .media-section, .media-section.reverse { grid-template-columns: 1fr; }
  .product-row.reverse .product-summary, .product-row.reverse .image-trigger, .media-section.reverse .image-trigger, .media-section.reverse .media-copy { order: initial; }
  .product-row .image-trigger, .media-section .image-trigger { margin-top: 8px; }
  .product-hero { grid-template-columns: 1fr; }
  .signal-list { grid-template-columns: repeat(4, 1fr); margin: 55px 0 0; }
  .signal-list span { min-height: 72px; }
  .feature-split, .preset-section, .donation-section, .technical-grid { grid-template-columns: 1fr; gap: 45px; }
}

@media (max-width: 760px) {
  .site-header { min-height: 68px; }
  .brand-mark { width: 42px; height: 42px; }
  .brand-name { font-size: 21px; }
  .nav-toggle { display: block; }
  .main-nav { position: absolute; top: 68px; right: 0; left: 0; display: none; align-items: stretch; gap: 0; padding: 8px 24px 15px; background: #fff; border-bottom: 1px solid var(--line); }
  .main-nav.open { display: grid; }
  .main-nav a { padding: 11px 0; border-bottom: 1px solid #edf0f2; }
  .main-nav a[aria-current="page"]::after { display: none; }
  .home-hero { min-height: 470px; }
  .hero-copy { padding-top: 70px; }
  .hero-copy h1, .product-hero-copy h1 { font-size: 43px; }
  .statement, .product-row, .feature-intro, .media-section, .feature-split, .preset-section, .donation-section, .edition-section, .technical-section, .downloads-section { padding-top: 75px; padding-bottom: 78px; }
  .feature-intro { grid-template-columns: 1fr; gap: 18px; }
  .principles, .privacy-band, .edition-band, .section-heading, .technical-intro, .downloads-intro { grid-template-columns: 1fr; gap: 25px; }
  .technical-intro .section-number { grid-row: auto; }
  .edition-actions { grid-template-columns: 1fr; }
  .download-card-heading, .host-options { grid-template-columns: 1fr; }
  .product-hero { min-height: auto; padding-top: 70px; padding-bottom: 72px; }
  .signal-list { grid-template-columns: repeat(2, 1fr); }
  .metric-grid { grid-template-columns: 1fr; }
  .site-footer { grid-template-columns: 1fr; gap: 17px; }
}

@media (max-width: 520px) {
  .hero-copy h1, .product-hero-copy h1 { font-size: 39px; }
  .hero-copy > p:not(.eyebrow), .product-hero-copy > p:not(.eyebrow):not(.cta-note) { font-size: 18px; }
  .protocol-field { grid-template-columns: repeat(2, 1fr); }
  .product-row { gap: 44px; }
  .product-summary h2, .feature-intro h2, .media-copy h2, .feature-split h2, .preset-section h2, .free-band h2, .donation-copy h2, .principles h2, .edition-band h2, .privacy-band h2, .section-heading h2, .technical-intro h2 { font-size: 34px; }
  .amount-options { grid-template-columns: repeat(2, 1fr); }
  .donation-panel { padding: 22px; }
  .image-viewer { width: 100vw; height: 100vh; }
  .viewer-toolbar { align-items: flex-start; min-height: 96px; flex-direction: column; gap: 7px; }
  .viewer-actions { width: 100%; flex-wrap: wrap; }
  .viewer-stage { height: calc(100vh - 96px); padding: 10px; }
  .image-trigger > span, .product-image-link > span { right: 8px; bottom: 8px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .image-trigger img, .product-image-link img { transition: none; }
}