:root {
    --primary: #2F8F83;
    --primary-strong: #24786e;
    --secondary: #F2B36F;
    --dark: #243331;
    --bg: #FAFCFA;
    --surface: #EEF5F2;
    --text: #2E3836;
    --muted: #71807C;
    --accent: #E96B4C;
    --white: #ffffff;
    --line: #dce8e3;
    --shadow-sm: 0 8px 24px rgba(36, 51, 49, 0.07);
    --shadow-md: 0 18px 60px rgba(36, 51, 49, 0.12);
    --radius-sm: 12px;
    --radius-md: 20px;
    --radius-lg: 32px;
    --shell: min(1180px, calc(100vw - 40px));
    --header-h: 78px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    color: var(--text);
    background: var(--bg);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
    line-height: 1.72;
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
}
img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
button, input, textarea, select { font: inherit; }
button { color: inherit; }
p, ul, ol { margin-top: 0; }
h1, h2, h3 { color: var(--dark); line-height: 1.16; letter-spacing: -0.02em; }
h1 { font-size: clamp(2.55rem, 6vw, 5.2rem); margin: 0 0 24px; }
h2 { font-size: clamp(2rem, 4vw, 3.25rem); margin: 0 0 20px; }
h3 { font-size: 1.22rem; margin: 0 0 10px; }
.shell { width: var(--shell); margin-inline: auto; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
.skip-link { position: fixed; top: 10px; left: 10px; transform: translateY(-140%); z-index: 1000; background: var(--dark); color: var(--white); padding: 10px 16px; border-radius: 10px; }
.skip-link:focus { transform: translateY(0); }

.site-header { position: sticky; top: 0; z-index: 100; background: rgba(250, 252, 250, 0.92); backdrop-filter: blur(18px); border-bottom: 1px solid transparent; transition: border-color .2s ease, box-shadow .2s ease; }
.site-header.is-scrolled { border-color: var(--line); box-shadow: 0 8px 24px rgba(36,51,49,.05); }
.site-header__inner { min-height: var(--header-h); display: flex; align-items: center; justify-content: space-between; gap: 28px; }
.brand { display: inline-flex; align-items: center; gap: 12px; min-width: 0; }
.brand img { width: 44px; height: 44px; object-fit: cover; border-radius: 13px; background: var(--surface); }
.brand__text { display: grid; gap: 1px; }
.brand__text strong { color: var(--dark); font-size: 1.08rem; }
.brand__text small { color: var(--muted); font-size: .76rem; }
.site-nav { display: flex; align-items: center; gap: 8px; }
.site-nav a { padding: 10px 14px; border-radius: 999px; color: #40504d; font-size: .94rem; transition: background .2s ease, color .2s ease, transform .2s ease; }
.site-nav a:hover { background: var(--surface); color: var(--primary-strong); transform: translateY(-1px); }
.site-nav a[aria-current="page"] { background: var(--dark); color: var(--white); }
.menu-toggle { display: none; width: 44px; height: 44px; border-radius: 12px; border: 1px solid var(--line); background: var(--white); align-items: center; justify-content: center; cursor: pointer; }
.menu-toggle__icon { width: 20px; display: grid; gap: 4px; }
.menu-toggle__icon i { height: 2px; background: var(--dark); border-radius: 999px; }

.hero { padding: 70px 0 46px; overflow: hidden; }
.hero--home { background: radial-gradient(circle at 78% 22%, rgba(242,179,111,.24), transparent 27%), radial-gradient(circle at 20% 60%, rgba(47,143,131,.12), transparent 35%); }
.hero__grid { display: grid; grid-template-columns: 1.05fr .95fr; align-items: center; gap: clamp(34px, 6vw, 86px); }
.hero__copy { position: relative; z-index: 2; }
.hero__lead, .subhero__lead { font-size: clamp(1.08rem, 2vw, 1.25rem); color: #53615f; max-width: 760px; margin-bottom: 28px; }
.hero__actions { display: flex; flex-wrap: wrap; gap: 12px; margin: 0 0 24px; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 48px; padding: 0 20px; border-radius: 14px; border: 1px solid transparent; font-weight: 700; transition: transform .2s ease, box-shadow .2s ease, background .2s ease; }
.button:hover { transform: translateY(-2px); }
.button--primary { background: var(--primary); color: var(--white); box-shadow: 0 12px 28px rgba(47,143,131,.22); }
.button--primary:hover { background: var(--primary-strong); }
.button--soft { background: var(--surface); color: var(--dark); border-color: #d8e6e0; }
.button--light { background: var(--white); color: var(--dark); }
.button--block { width: 100%; margin-top: 14px; }
.eyebrow { display: inline-flex; color: var(--primary-strong); font-size: .76rem; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; margin-bottom: 12px; }
.eyebrow--accent { color: var(--accent); }
.topic-chips { display: flex; flex-wrap: wrap; gap: 8px; }
.topic-chip { padding: 7px 11px; border-radius: 999px; background: rgba(47,143,131,.08); color: #3d625d; border: 1px solid rgba(47,143,131,.14); font-size: .82rem; }
.hero__media { position: relative; min-width: 0; }
.hero__media::before { content: ""; position: absolute; inset: 5% -5% -5% 10%; border-radius: var(--radius-lg); background: linear-gradient(135deg, rgba(47,143,131,.13), rgba(242,179,111,.18)); transform: rotate(3deg); }
.hero__media img { position: relative; width: 100%; aspect-ratio: 1.08; object-fit: cover; border-radius: var(--radius-lg); box-shadow: var(--shadow-md); }
.hero-note { position: absolute; right: -14px; bottom: 28px; padding: 14px 18px; background: rgba(255,255,255,.92); border: 1px solid rgba(255,255,255,.72); border-radius: 16px; box-shadow: var(--shadow-sm); backdrop-filter: blur(10px); display: grid; }
.hero-note span { color: var(--muted); font-size: .76rem; }
.hero-note strong { color: var(--dark); }

.section { padding: 86px 0; scroll-margin-top: calc(var(--header-h) + 18px); }
.section--tight { padding-top: 48px; padding-bottom: 70px; }
.section--surface { background: var(--surface); }
.section--dark { background: var(--dark); color: #dfe8e5; }
.section--dark h2, .section--dark h3, .section--dark .eyebrow { color: var(--white); }
.section-heading { max-width: 760px; margin-bottom: 34px; }
.section-heading > p:last-child { color: var(--muted); font-size: 1.02rem; }
.section-heading--split { max-width: none; display: grid; grid-template-columns: 1fr minmax(280px, .72fr); gap: 40px; align-items: end; }
.section-heading--split > p { margin-bottom: 8px; }
.section-heading--inverse > p { color: #bdcbc7; }
.steps { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; counter-reset: step; }
.steps li { padding: 22px; border-radius: var(--radius-md); border: 1px solid var(--line); background: var(--white); display: grid; grid-template-columns: 44px 1fr; gap: 14px; box-shadow: 0 8px 22px rgba(36,51,49,.04); }
.steps__num { width: 42px; height: 42px; display: grid; place-items: center; border-radius: 13px; background: var(--surface); color: var(--primary-strong); font-weight: 800; }
.steps h3 { font-size: 1.04rem; }
.steps p { margin: 0; color: var(--muted); font-size: .92rem; }

.content-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.content-card { position: relative; padding: 24px; border-radius: var(--radius-md); background: var(--white); border: 1px solid var(--line); min-height: 100%; box-shadow: 0 8px 26px rgba(36,51,49,.04); transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease; }
.content-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-sm); border-color: #c7ddd5; }
.content-card__meta { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 10px; margin-bottom: 14px; }
.content-card .eyebrow { margin: 0; color: var(--accent); }
.format { color: var(--muted); font-size: .78rem; }
.content-card p { color: #5f6c69; font-size: .94rem; }
.mini-list { padding: 0; margin: 18px 0 0; list-style: none; display: grid; gap: 8px; }
.mini-list li { position: relative; padding-left: 18px; color: #53615f; font-size: .86rem; }
.mini-list li::before { content: ""; position: absolute; left: 2px; top: .72em; width: 6px; height: 6px; border-radius: 50%; background: var(--secondary); }

.split-layout { display: grid; grid-template-columns: .92fr 1.08fr; gap: clamp(36px, 6vw, 82px); align-items: center; }
.split-layout--reverse .split-layout__media { order: 2; }
.split-layout__media img { width: 100%; border-radius: var(--radius-lg); aspect-ratio: 1.05; object-fit: cover; box-shadow: var(--shadow-sm); }
.split-layout__media--narrow img { aspect-ratio: .9; }
.split-layout__copy > p:not(.eyebrow) { color: #586663; font-size: 1.02rem; }
.insight-list { margin-top: 28px; display: grid; gap: 14px; }
.insight-list article { display: grid; grid-template-columns: 142px 1fr; gap: 14px; padding-top: 14px; border-top: 1px solid rgba(47,143,131,.16); }
.insight-list article:first-child { padding-top: 0; border-top: 0; }
.insight-list strong { color: var(--dark); }
.insight-list span { color: var(--muted); }

.device-panel { display: grid; grid-template-columns: .92fr 1.08fr; gap: 60px; align-items: center; padding: 48px; border-radius: var(--radius-lg); background: linear-gradient(135deg, #f2f8f5, #fffaf4); border: 1px solid #e2ebe7; }
.device-panel__copy > p { color: #586663; }
.device-panel__visual img { border-radius: var(--radius-md); width: 100%; aspect-ratio: 1.34; object-fit: cover; box-shadow: var(--shadow-sm); }
.check-list { list-style: none; padding: 0; display: grid; gap: 10px; margin: 24px 0; }
.check-list li { position: relative; padding-left: 28px; color: #4f5f5c; }
.check-list li::before { content: "✓"; position: absolute; left: 0; top: 0; color: var(--primary); font-weight: 900; }
.text-link { color: var(--primary-strong); font-weight: 800; display: inline-flex; gap: 8px; align-items: center; }
.text-link span { transition: transform .2s ease; }
.text-link:hover span { transform: translateX(4px); }

.device-cards { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.device-card { display: grid; gap: 12px; padding: 18px; border-radius: var(--radius-md); background: rgba(255,255,255,.06); border: 1px solid rgba(255,255,255,.1); transition: transform .25s ease, background .25s ease; }
.device-card:hover { transform: translateY(-4px); background: rgba(255,255,255,.09); }
.device-card img { width: 100%; aspect-ratio: 1.52; object-fit: cover; border-radius: 16px; }
.device-card h3 { font-size: 1.35rem; }
.device-card p { color: #c4d0cd; margin-bottom: 0; }
.device-card__link { color: #ffd5a4; font-weight: 800; font-size: .92rem; }

.faq-layout { display: grid; grid-template-columns: .72fr 1.28fr; gap: 60px; align-items: start; }
.faq-layout__intro { position: sticky; top: calc(var(--header-h) + 26px); }
.faq-layout__intro > p { color: var(--muted); }
.faq-layout__intro img { margin-top: 24px; width: 100%; max-width: 420px; border-radius: var(--radius-md); aspect-ratio: 1.24; object-fit: cover; }
.accordion { border-top: 1px solid var(--line); }
.accordion__item { border-bottom: 1px solid var(--line); }
.accordion__item h3 { margin: 0; }
.accordion__button { width: 100%; border: 0; background: transparent; display: flex; align-items: center; justify-content: space-between; gap: 20px; padding: 22px 0; text-align: left; font-weight: 800; cursor: pointer; color: var(--dark); }
.accordion__button:hover { color: var(--primary-strong); }
.accordion__icon { flex: 0 0 auto; display: grid; place-items: center; width: 30px; height: 30px; border-radius: 50%; background: var(--surface); color: var(--primary-strong); font-size: 1.25rem; }
.accordion__panel { padding: 0 48px 20px 0; color: var(--muted); }
.accordion__panel p { margin: 0; }

.subhero { padding: 58px 0 64px; background: radial-gradient(circle at 84% 30%, rgba(242,179,111,.22), transparent 28%), linear-gradient(180deg, #f8fbf9, var(--bg)); }
.subhero--pc { background: radial-gradient(circle at 80% 28%, rgba(47,143,131,.16), transparent 30%), linear-gradient(180deg, #f8fbf9, var(--bg)); }
.subhero--app { background: radial-gradient(circle at 80% 28%, rgba(233,107,76,.12), transparent 28%), linear-gradient(180deg, #f8fbf9, var(--bg)); }
.subhero__grid { display: grid; grid-template-columns: 1.08fr .92fr; gap: 66px; align-items: center; }
.subhero h1 { font-size: clamp(2.35rem, 5vw, 4.3rem); }
.subhero__media img { width: 100%; aspect-ratio: 1.18; object-fit: cover; border-radius: var(--radius-lg); box-shadow: var(--shadow-md); }
.subhero__media--framed img { border: 12px solid #e4efeb; }
.subhero__media--phone img { aspect-ratio: 1.06; }
.breadcrumbs { margin-bottom: 24px; }
.breadcrumbs ol { display: flex; flex-wrap: wrap; gap: 9px; list-style: none; padding: 0; margin: 0; color: var(--muted); font-size: .84rem; }
.breadcrumbs li { display: inline-flex; align-items: center; gap: 9px; }
.breadcrumbs li:not(:last-child)::after { content: "/"; color: #afbbb8; }
.breadcrumbs a:hover { color: var(--primary-strong); }

.reading-grid { display: grid; grid-template-columns: 1.12fr .88fr; gap: 70px; align-items: start; }
.reading-grid > div > p:not(.eyebrow) { color: var(--muted); max-width: 720px; }
.reading-grid__aside img { width: 100%; border-radius: var(--radius-md); aspect-ratio: 1.2; object-fit: cover; box-shadow: var(--shadow-sm); }
.numbered-list { list-style: none; padding: 0; margin: 28px 0 0; display: grid; gap: 16px; counter-reset: item; }
.numbered-list li { counter-increment: item; display: grid; grid-template-columns: 1fr; gap: 5px; position: relative; padding: 20px 22px 20px 64px; background: var(--white); border: 1px solid var(--line); border-radius: 16px; }
.numbered-list li::before { content: counter(item, decimal-leading-zero); position: absolute; left: 20px; top: 18px; color: var(--primary); font-weight: 900; font-size: 1rem; }
.numbered-list li strong { color: var(--dark); }
.numbered-list li span { color: var(--muted); font-size: .93rem; }
.numbered-list--compact li { padding-block: 16px; }
.notice { margin-top: 18px; padding: 18px 20px; border-radius: 16px; background: var(--surface); border: 1px solid #dce9e4; }
.notice--warm { background: #fff8ef; border-color: #f0dfcb; }
.notice strong { display: block; color: var(--dark); margin-bottom: 4px; }
.notice p { margin: 0; color: #65716f; font-size: .9rem; }

.metric-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.metric-grid article { border-top: 3px solid var(--primary); padding: 24px 20px; background: var(--white); border-radius: 0 0 18px 18px; box-shadow: var(--shadow-sm); }
.metric-grid article > strong { display: inline-block; color: var(--accent); font-size: .74rem; letter-spacing: .08em; margin-bottom: 14px; }
.metric-grid article p { color: var(--muted); margin-bottom: 0; font-size: .92rem; }
.link-panel { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 50px; }
.link-panel p { color: #c3cfcc; max-width: 760px; margin-bottom: 0; }
.link-panel .button { white-space: nowrap; }

.key-list { list-style: none; padding: 0; margin: 26px 0 0; display: grid; gap: 12px; }
.key-list li { display: grid; grid-template-columns: 118px 1fr; gap: 18px; align-items: start; padding: 14px 0; border-top: 1px solid var(--line); }
kbd { display: inline-block; min-width: 32px; padding: 4px 8px; margin-right: 4px; border: 1px solid #cddbd6; border-bottom-width: 3px; border-radius: 7px; background: var(--white); color: var(--dark); font-size: .82rem; text-align: center; box-shadow: 0 1px 0 rgba(36,51,49,.05); }
.key-list span { color: var(--muted); }
.card-stack { display: grid; gap: 14px; }
.info-card { padding: 24px; border-radius: 18px; border: 1px solid var(--line); background: var(--white); box-shadow: var(--shadow-sm); }
.info-card p { color: var(--muted); margin-bottom: 0; }

.not-found { min-height: 62vh; display: grid; place-items: center; padding: 100px 0; text-align: center; }
.not-found__inner { max-width: 720px; }
.not-found h1 { font-size: clamp(2.3rem, 5vw, 4rem); }
.not-found p:not(.eyebrow) { color: var(--muted); font-size: 1.08rem; }
.not-found .hero__actions { justify-content: center; margin-top: 28px; }

.site-footer { padding: 60px 0 24px; background: #1d2927; color: #b9c7c3; }
.site-footer__grid { display: grid; grid-template-columns: 1.3fr .7fr .7fr; gap: 60px; }
.brand--footer strong { color: var(--white); }
.brand--footer small { color: #9eb0ab; }
.site-footer__intro { max-width: 460px; margin-top: 18px; }
.footer-heading { font-size: .9rem; color: var(--white); margin-bottom: 16px; letter-spacing: .04em; }
.footer-links { list-style: none; padding: 0; display: grid; gap: 9px; }
.footer-links a:hover { color: var(--white); }
.site-footer__bottom { margin-top: 44px; padding-top: 22px; border-top: 1px solid rgba(255,255,255,.09); display: flex; justify-content: space-between; gap: 20px; font-size: .82rem; }
.site-footer__bottom p { margin: 0; }
.site-footer__bottom a { color: #dde8e5; }

.image-unavailable { position: relative; background: linear-gradient(135deg, var(--surface), #fbf6ef); min-height: 180px; border-radius: inherit; }
.image-unavailable img { opacity: .06; }
.image-unavailable::after { content: ""; position: absolute; inset: 0; display: block; }
.will-reveal { opacity: 0; transform: translateY(14px); }
.will-reveal.is-visible { opacity: 1; transform: none; transition: opacity .5s ease, transform .5s ease; }

:focus-visible { outline: 3px solid rgba(233,107,76,.42); outline-offset: 4px; }

@media (max-width: 1080px) {
    :root { --shell: min(940px, calc(100vw - 34px)); }
    .content-grid { grid-template-columns: repeat(2, 1fr); }
    .steps { grid-template-columns: repeat(2, 1fr); }
    .metric-grid { grid-template-columns: repeat(2, 1fr); }
    .hero__grid, .subhero__grid { gap: 40px; }
    .device-panel { padding: 36px; gap: 38px; }
    .faq-layout { gap: 42px; }
}

@media (max-width: 840px) {
    :root { --header-h: 68px; }
    .site-header__inner { min-height: var(--header-h); }
    .brand img { width: 38px; height: 38px; }
    .brand__text small { display: none; }
    .menu-toggle { display: inline-flex; }
    .site-nav { position: fixed; top: calc(var(--header-h) + 8px); right: 18px; left: 18px; display: none; padding: 10px; border: 1px solid var(--line); border-radius: 18px; background: rgba(255,255,255,.98); box-shadow: var(--shadow-md); }
    .site-nav.is-open { display: grid; }
    .site-nav a { width: 100%; padding: 12px 14px; }
    body.menu-open { overflow: hidden; }
    .hero { padding-top: 42px; }
    .hero__grid, .subhero__grid, .split-layout, .device-panel, .reading-grid { grid-template-columns: 1fr; }
    .subhero__media { max-width: 640px; }
    .hero__media { max-width: 680px; }
    .hero__media::before { right: 0; }
    .hero-note { right: 12px; }
    .split-layout--reverse .split-layout__media { order: 0; }
    .device-panel { padding: 28px; }
    .faq-layout { grid-template-columns: 1fr; }
    .faq-layout__intro { position: static; }
    .faq-layout__intro img { max-width: 520px; }
    .section-heading--split { grid-template-columns: 1fr; gap: 6px; }
    .link-panel { grid-template-columns: 1fr; gap: 26px; }
    .link-panel .button { justify-self: start; }
    .site-footer__grid { grid-template-columns: 1.2fr 1fr 1fr; gap: 30px; }
}

@media (max-width: 620px) {
    :root { --shell: calc(100vw - 28px); }
    body { font-size: 15px; }
    h1 { font-size: clamp(2.2rem, 11vw, 3.4rem); }
    h2 { font-size: clamp(1.72rem, 8vw, 2.5rem); }
    .hero, .subhero { padding-top: 32px; }
    .hero__lead, .subhero__lead { font-size: 1rem; }
    .hero__actions .button { width: 100%; }
    .section { padding: 62px 0; }
    .section--tight { padding-top: 36px; }
    .steps, .content-grid, .metric-grid, .device-cards { grid-template-columns: 1fr; }
    .steps li { grid-template-columns: 40px 1fr; }
    .device-panel { padding: 22px; border-radius: 22px; }
    .insight-list article { grid-template-columns: 1fr; gap: 4px; }
    .accordion__button { padding: 18px 0; }
    .accordion__panel { padding-right: 0; }
    .key-list li { grid-template-columns: 1fr; gap: 8px; }
    .site-footer__grid { grid-template-columns: 1fr; gap: 22px; }
    .site-footer__bottom { display: grid; }
    .hero-note { position: static; margin-top: 12px; }
}

@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; scroll-behavior: auto !important; }
    .will-reveal { opacity: 1; transform: none; }
}

@media print {
    .site-header, .site-footer, .hero__actions, .menu-toggle { display: none !important; }
    body { background: #fff; color: #000; }
    .section, .hero, .subhero { padding: 24px 0; }
    .content-card, .steps li, .metric-grid article, .info-card { box-shadow: none; break-inside: avoid; }
}

/* Content directory: dense, scannable topic comparison without turning each label into a standalone page. */
.directory-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.directory-card { padding: 22px; border-radius: 18px; background: var(--white); border: 1px solid var(--line); display: flex; flex-direction: column; min-height: 100%; box-shadow: 0 6px 18px rgba(36,51,49,.035); }
.directory-card__label { align-self: flex-start; padding: 5px 9px; border-radius: 999px; background: rgba(47,143,131,.09); color: var(--primary-strong); font-size: .75rem; font-weight: 800; margin-bottom: 14px; }
.directory-card h3 { font-size: 1.08rem; }
.directory-card > p { color: var(--muted); font-size: .91rem; }
.directory-card__watch { margin-top: auto; padding-top: 16px; border-top: 1px dashed #d7e4df; display: grid; gap: 4px; }
.directory-card__watch strong { color: var(--dark); font-size: .8rem; }
.directory-card__watch span { color: #62706d; font-size: .84rem; }

.trouble-table { border-top: 1px solid var(--line); }
.trouble-row { display: grid; grid-template-columns: minmax(180px,.8fr) 1fr 1fr; gap: 24px; padding: 22px 0; border-bottom: 1px solid var(--line); align-items: start; }
.trouble-row h3 { margin: 0; font-size: 1rem; }
.trouble-row div { display: grid; gap: 5px; }
.trouble-row div > span { color: var(--accent); font-weight: 800; font-size: .75rem; letter-spacing: .04em; }
.trouble-row p { margin: 0; color: var(--muted); font-size: .9rem; }

.advice-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.advice-card { padding: 22px; border-radius: 18px; background: var(--white); border: 1px solid var(--line); min-height: 100%; }
.advice-card h3 { font-size: 1rem; position: relative; padding-top: 16px; }
.advice-card h3::before { content: ""; position: absolute; left: 0; top: 0; width: 38px; height: 3px; border-radius: 999px; background: var(--primary); }
.advice-card p { color: var(--muted); font-size: .9rem; margin: 0; }
.advice-grid--mobile .advice-card:nth-child(3n+2) h3::before { background: var(--secondary); }
.advice-grid--mobile .advice-card:nth-child(3n) h3::before { background: var(--accent); }

@media (max-width: 1080px) {
    .directory-grid { grid-template-columns: repeat(2, 1fr); }
    .advice-grid { grid-template-columns: repeat(2, 1fr); }
    .trouble-row { grid-template-columns: .9fr 1fr 1fr; gap: 18px; }
}

@media (max-width: 760px) {
    .trouble-row { grid-template-columns: 1fr; gap: 10px; }
    .trouble-row div { padding-left: 16px; border-left: 2px solid #dce8e3; }
}

@media (max-width: 620px) {
    .directory-grid, .advice-grid { grid-template-columns: 1fr; }
}

/* Fine-grained layout refinements for large displays, compact laptops and touch devices. */
@media (min-width: 1280px) {
    .hero__copy { padding-right: 12px; }
    .hero__media { padding-left: 8px; }
    .content-grid { gap: 18px; }
    .content-card { padding: 26px; }
    .directory-grid { gap: 18px; }
    .directory-card { padding: 24px; }
    .site-footer__grid { padding-top: 4px; }
}

@media (min-width: 841px) {
    .site-nav a { position: relative; }
    .site-nav a::after { content: ""; position: absolute; left: 14px; right: 14px; bottom: 6px; height: 2px; border-radius: 999px; background: var(--secondary); transform: scaleX(0); transform-origin: center; transition: transform .2s ease; }
    .site-nav a:hover::after { transform: scaleX(1); }
    .site-nav a[aria-current="page"]::after { display: none; }
    .device-card:focus-visible, .content-card:focus-within { box-shadow: 0 0 0 4px rgba(47,143,131,.15); }
}

@media (max-width: 980px) and (min-width: 841px) {
    .site-nav { gap: 2px; }
    .site-nav a { padding-inline: 10px; }
    .brand__text small { max-width: 160px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
    .hero__grid, .subhero__grid { grid-template-columns: 1fr 1fr; }
    .hero h1 { font-size: clamp(2.4rem, 5vw, 4rem); }
}

@media (max-width: 840px) {
    .site-nav { max-height: calc(100vh - var(--header-h) - 28px); overflow-y: auto; overscroll-behavior: contain; }
    .site-nav a[aria-current="page"] { order: -1; }
    .subhero__grid { gap: 30px; }
    .subhero__media { width: min(100%, 620px); }
    .reading-grid { gap: 36px; }
    .split-layout { gap: 34px; }
    .device-panel { gap: 30px; }
    .faq-layout { gap: 30px; }
    .section-heading { margin-bottom: 28px; }
    .device-cards { gap: 14px; }
    .content-card, .advice-card, .directory-card { min-height: auto; }
}

@media (max-width: 520px) {
    .site-header__inner { gap: 14px; }
    .brand__text strong { font-size: 1rem; }
    .hero__media img, .subhero__media img { border-radius: 22px; }
    .hero__media::before { border-radius: 24px; }
    .content-card, .advice-card, .directory-card, .info-card { padding: 19px; border-radius: 16px; }
    .numbered-list li { padding: 18px 18px 18px 56px; }
    .numbered-list li::before { left: 16px; }
    .topic-chip { font-size: .78rem; }
    .faq-layout__intro img { border-radius: 16px; }
    .footer-links { gap: 7px; }
}

@media (hover: none) {
    .button:hover, .content-card:hover, .device-card:hover, .text-link:hover span { transform: none; }
    .content-card:hover { box-shadow: 0 8px 26px rgba(36,51,49,.04); }
}

/* Shared typography and rhythm details. */
.section p + p { margin-top: 12px; }
.content-card h3, .directory-card h3, .advice-card h3, .metric-grid h3 { text-wrap: balance; }
.hero h1, .subhero h1, .section-heading h2, .split-layout h2, .faq-layout h2, .link-panel h2 { text-wrap: balance; }
.content-card p, .directory-card p, .advice-card p, .trouble-row p, .accordion__panel p { overflow-wrap: anywhere; }
.section--dark .button--light:focus-visible { outline-color: rgba(242,179,111,.7); }
.section--dark .device-card:focus-visible { outline-color: rgba(242,179,111,.7); }
.section--surface .directory-card, .section--surface .advice-card { box-shadow: 0 8px 24px rgba(36,51,49,.035); }
.section--surface .directory-card:hover, .section--surface .advice-card:hover { border-color: #cbded7; }

/* Image containers remain visually stable before user-provided WebP resources arrive. */
.hero__media, .subhero__media, .device-panel__visual, .split-layout__media, .faq-layout__intro, .reading-grid__aside { contain: layout paint; }
.hero__media img, .subhero__media img, .device-panel__visual img, .split-layout__media img, .device-card img, .faq-layout__intro img, .reading-grid__aside img { background: linear-gradient(135deg, #eaf3ef, #fff6ec); }
img[loading="lazy"] { content-visibility: auto; }

/* Better touch targets and readable list rhythm. */
.accordion__button, .site-nav a, .button, .text-link { -webkit-tap-highlight-color: transparent; }
.footer-links a { display: inline-block; padding-block: 2px; }
.breadcrumbs a { text-decoration-thickness: 1px; text-underline-offset: 3px; }
.breadcrumbs a:hover { text-decoration: underline; }
.check-list li, .mini-list li, .key-list li, .numbered-list li { break-inside: avoid; }

/* High contrast user preference: preserve semantic hierarchy without changing brand palette. */
@media (prefers-contrast: more) {
    :root { --line: #9eb2ac; --muted: #52615d; }
    .button--soft, .content-card, .directory-card, .advice-card, .info-card, .steps li { border-width: 2px; }
    .site-nav a[aria-current="page"] { outline: 2px solid var(--white); outline-offset: -4px; }
    .topic-chip { border-color: var(--primary); }
}

/* Forced colors mode keeps controls and focus states visible. */
@media (forced-colors: active) {
    .button, .menu-toggle, .content-card, .directory-card, .advice-card, .info-card, .steps li, .device-card { border: 1px solid CanvasText; }
    .button--primary, .site-nav a[aria-current="page"] { forced-color-adjust: none; background: CanvasText; color: Canvas; }
    .accordion__icon, .steps__num, .topic-chip { border: 1px solid CanvasText; }
}