:root {
  --primary: #2f8f83;
  --primary-dark: #247468;
  --secondary: #f2b36f;
  --ink: #243331;
  --text: #2e3836;
  --muted: #71807c;
  --bg: #fafcfa;
  --soft: #eef5f2;
  --accent: #e96b4c;
  --white: #ffffff;
  --line: #d9e7e2;
  --line-strong: #c4d9d2;
  --shadow-sm: 0 8px 24px rgba(36, 51, 49, 0.07);
  --shadow-md: 0 18px 48px rgba(36, 51, 49, 0.11);
  --shadow-lg: 0 28px 80px rgba(36, 51, 49, 0.16);
  --radius-sm: 12px;
  --radius-md: 20px;
  --radius-lg: 32px;
  --radius-xl: 44px;
  --content: 1220px;
  --reading: 760px;
  --header-h: 78px;
  --ease: cubic-bezier(.2,.7,.2,1);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; background: var(--bg); }
body {
  margin: 0;
  min-width: 320px;
  color: var(--text);
  background:
    radial-gradient(circle at 6% 2%, rgba(47,143,131,.08), transparent 28rem),
    radial-gradient(circle at 94% 16%, rgba(242,179,111,.10), transparent 26rem),
    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-thickness: .08em; text-underline-offset: .16em; }
button, input, select, textarea { font: inherit; }
button { color: inherit; }
figure { margin: 0; }
main { display: block; }
::selection { background: rgba(47,143,131,.22); color: var(--ink); }
:focus-visible { outline: 3px solid rgba(233,107,76,.42); outline-offset: 4px; border-radius: 8px; }
[hidden] { display: none !important; }
.sr-only {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0,0,0,0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}
.skip-link {
  position: fixed;
  z-index: 1000;
  left: 16px;
  top: 12px;
  transform: translateY(-160%);
  background: var(--ink);
  color: var(--white);
  padding: 10px 16px;
  border-radius: 999px;
  text-decoration: none;
  transition: transform .2s var(--ease);
}
.skip-link:focus { transform: translateY(0); }
.site-shell { min-height: 100vh; overflow: clip; }
.section-pad { width: min(calc(100% - 48px), var(--content)); margin-inline: auto; padding-block: 72px; }
.narrow-top { padding-top: 42px; }
.eyebrow {
  margin: 0 0 10px;
  color: var(--primary-dark);
  font-size: .82rem;
  font-weight: 800;
  letter-spacing: .12em;
  text-transform: uppercase;
}
h1, h2, h3 { color: var(--ink); line-height: 1.24; text-wrap: balance; }
h1 { margin: 0; font-size: clamp(2.35rem, 5vw, 4.7rem); letter-spacing: -.045em; }
h2 { margin: 0; font-size: clamp(1.75rem, 3vw, 3rem); letter-spacing: -.028em; }
h3 { margin: 0; font-size: clamp(1.06rem, 1.7vw, 1.38rem); }
p { margin: 0; }
.hero-lead { max-width: 760px; margin-top: 24px; color: #495854; font-size: clamp(1.04rem, 1.5vw, 1.24rem); line-height: 1.9; }

.site-header {
  position: sticky;
  z-index: 100;
  top: 0;
  border-bottom: 1px solid rgba(196,217,210,.7);
  background: rgba(250,252,250,.9);
  backdrop-filter: blur(18px) saturate(1.1);
  transition: box-shadow .25s ease, background-color .25s ease;
}
.site-header.is-scrolled { box-shadow: 0 12px 35px rgba(36,51,49,.08); background: rgba(250,252,250,.96); }
.header-inner {
  width: min(calc(100% - 48px), var(--content));
  min-height: var(--header-h);
  margin-inline: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
}
.brand { display: inline-flex; align-items: center; gap: 12px; text-decoration: none; min-width: 0; }
.brand-mark { width: 42px; height: 42px; object-fit: cover; border-radius: 13px; box-shadow: 0 6px 18px rgba(47,143,131,.14); }
.brand-copy { display: grid; min-width: 0; }
.brand-copy strong { color: var(--ink); font-size: 1rem; letter-spacing: .01em; }
.brand-copy small { color: var(--muted); font-size: .72rem; white-space: nowrap; }
.desktop-nav { display: flex; align-items: center; gap: 6px; }
.desktop-nav a {
  padding: 9px 14px;
  border-radius: 999px;
  color: #52625e;
  font-size: .93rem;
  font-weight: 700;
  text-decoration: none;
  transition: color .2s ease, background .2s ease;
}
.desktop-nav a:hover { color: var(--ink); background: var(--soft); }
.desktop-nav a[aria-current="page"] { color: var(--primary-dark); background: rgba(47,143,131,.11); }
.menu-toggle { display: none; width: 44px; height: 44px; align-items: center; justify-content: center; border: 1px solid var(--line); border-radius: 14px; background: var(--white); cursor: pointer; }
.menu-toggle-lines { width: 20px; display: grid; gap: 4px; }
.menu-toggle-lines i { display: block; height: 2px; border-radius: 999px; background: var(--ink); transition: transform .2s ease, opacity .2s ease; }
.menu-toggle[aria-expanded="true"] i:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.menu-toggle[aria-expanded="true"] i:nth-child(2) { opacity: 0; }
.menu-toggle[aria-expanded="true"] i:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }
.mobile-nav-wrap { display: none; }
.mobile-nav { width: min(calc(100% - 32px), var(--content)); margin: 0 auto 14px; padding: 8px; border: 1px solid var(--line); border-radius: 20px; background: var(--white); box-shadow: var(--shadow-md); }
.mobile-nav a { display: flex; align-items: center; justify-content: space-between; padding: 13px 14px; border-radius: 12px; text-decoration: none; font-weight: 700; }
.mobile-nav a[aria-current="page"] { color: var(--primary-dark); background: var(--soft); }

.button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  padding: 12px 20px;
  border: 1px solid transparent;
  border-radius: 15px;
  font-weight: 800;
  text-decoration: none;
  transition: transform .2s var(--ease), box-shadow .2s ease, border-color .2s ease, background .2s ease;
}
.button:hover { transform: translateY(-2px); }
.button-primary { color: var(--white); background: var(--primary); box-shadow: 0 12px 28px rgba(47,143,131,.22); }
.button-primary:hover { background: var(--primary-dark); box-shadow: 0 16px 34px rgba(47,143,131,.28); }
.button-secondary { color: var(--ink); background: var(--secondary); }
.button-secondary:hover { box-shadow: 0 14px 30px rgba(242,179,111,.25); }
.button-quiet { border-color: var(--line-strong); color: var(--ink); background: rgba(255,255,255,.78); }
.button-quiet:hover { border-color: var(--primary); background: var(--white); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.text-link { display: inline-flex; gap: 8px; align-items: center; color: var(--primary-dark); font-weight: 800; text-decoration: none; }
.text-link:hover { text-decoration: underline; }

.home-hero { display: grid; grid-template-columns: minmax(0,1.05fr) minmax(380px,.95fr); align-items: center; gap: clamp(36px, 6vw, 86px); padding-top: 64px; }
.hero-copy { min-width: 0; }
.hero-visual { position: relative; min-height: 520px; padding: 18px; border-radius: var(--radius-xl); background: linear-gradient(145deg, rgba(47,143,131,.15), rgba(242,179,111,.19)); }
.hero-visual::before { content: ""; position: absolute; inset: 42px auto auto -28px; width: 120px; height: 120px; border-radius: 50%; background: rgba(242,179,111,.38); filter: blur(3px); }
.hero-visual img { position: relative; width: 100%; height: 470px; object-fit: cover; border-radius: 30px; box-shadow: var(--shadow-lg); }
.hero-visual figcaption { position: absolute; left: 34px; right: 34px; bottom: 34px; padding: 12px 16px; border-radius: 14px; background: rgba(36,51,49,.82); color: rgba(255,255,255,.92); font-size: .88rem; backdrop-filter: blur(10px); }
.hero-facts { list-style: none; padding: 0; margin: 36px 0 0; display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 12px; }
.hero-facts li { padding: 14px 15px; border: 1px solid var(--line); border-radius: 15px; background: rgba(255,255,255,.62); }
.hero-facts strong { display: block; color: var(--ink); font-size: .91rem; }
.hero-facts span { display: block; margin-top: 3px; color: var(--muted); font-size: .78rem; line-height: 1.5; }

.section-heading { margin-bottom: 28px; }
.section-heading.heading-wide { display: grid; grid-template-columns: minmax(0,1fr) minmax(280px, 440px); align-items: end; gap: 40px; }
.section-heading.heading-wide > p, .compact-heading > p { color: var(--muted); }
.compact-heading { max-width: 760px; }
.compact-heading > p:last-child { margin-top: 16px; }
.content-band { padding-top: 86px; }
.featured-topic-grid { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 18px; }
.topic-card { display: flex; flex-direction: column; min-width: 0; overflow: hidden; border: 1px solid var(--line); border-radius: 24px; background: rgba(255,255,255,.82); box-shadow: 0 10px 30px rgba(36,51,49,.04); transition: transform .25s var(--ease), box-shadow .25s ease, border-color .25s ease; }
.topic-card:hover { transform: translateY(-4px); border-color: rgba(47,143,131,.38); box-shadow: var(--shadow-md); }
.topic-card-image { display: block; overflow: hidden; aspect-ratio: 16 / 9; background: var(--soft); }
.topic-card-image img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s var(--ease); }
.topic-card:hover .topic-card-image img { transform: scale(1.035); }
.topic-card-body { flex: 1; padding: 20px; }
.card-kicker { color: var(--accent); font-weight: 800; font-size: .78rem; letter-spacing: .08em; }
.topic-card h3 { margin-top: 7px; }
.topic-card h3 a { text-decoration: none; }
.topic-card h3 a:hover { color: var(--primary-dark); }
.topic-card-body > p:not(.card-kicker) { margin-top: 10px; color: var(--muted); font-size: .93rem; }
.tag-row { display: flex; flex-wrap: wrap; gap: 7px; margin-top: 16px; }
.tag-row span, .tag-row a { display: inline-flex; align-items: center; min-height: 28px; padding: 4px 10px; border-radius: 999px; background: var(--soft); color: #58706a; font-size: .76rem; font-weight: 700; text-decoration: none; }
.tag-row a:hover { color: var(--primary-dark); background: #e4f1ed; }
.section-cta { display: flex; justify-content: flex-end; margin-top: 24px; }

.route-section { margin-top: 30px; padding: 64px; border-radius: var(--radius-xl); background: var(--ink); color: rgba(255,255,255,.82); }
.route-section h2, .route-section h3 { color: var(--white); }
.route-section .eyebrow { color: #8fd8cc; }
.route-section .compact-heading > p { color: rgba(255,255,255,.62); }
.route-grid { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 14px; }
.route-card { position: relative; padding: 26px; border: 1px solid rgba(255,255,255,.11); border-radius: 22px; background: rgba(255,255,255,.055); }
.route-card h3 { padding-right: 26px; }
.route-card p { margin-top: 12px; color: rgba(255,255,255,.65); font-size: .93rem; }
.route-card a { display: inline-flex; margin-top: 20px; color: #bfeee7; font-weight: 800; text-decoration: none; }
.route-card a:hover { text-decoration: underline; }
.route-dot { position: absolute; right: 22px; top: 25px; width: 10px; height: 10px; border-radius: 50%; background: var(--secondary); box-shadow: 0 0 0 7px rgba(242,179,111,.12); }

.split-story { display: grid; grid-template-columns: minmax(0,.9fr) minmax(0,1.1fr); align-items: center; gap: 66px; }
.split-media { position: relative; }
.split-media::after { content: ""; position: absolute; z-index: -1; inset: 28px -26px -28px 28px; border-radius: 34px; background: var(--soft); }
.split-media img { width: 100%; aspect-ratio: 4 / 5; object-fit: cover; border-radius: 34px; box-shadow: var(--shadow-md); }
.split-copy > p:not(.eyebrow) { margin-top: 20px; color: var(--muted); font-size: 1.02rem; }
.inline-note { margin: 24px 0; padding: 18px 20px; border-left: 4px solid var(--secondary); border-radius: 0 14px 14px 0; background: #fff7ed; color: #5a5144; }
.inline-note strong { color: var(--ink); }

.mosaic-section { padding-top: 84px; }
.mosaic-grid { display: grid; grid-template-columns: 1.35fr .65fr; grid-template-rows: repeat(2, minmax(210px, auto)); gap: 16px; }
.mosaic-main, .mosaic-side { position: relative; overflow: hidden; border-radius: 28px; background: var(--soft); }
.mosaic-main { grid-row: 1 / 3; min-height: 540px; }
.mosaic-main img, .mosaic-side img { width: 100%; height: 100%; object-fit: cover; }
.mosaic-main::after, .mosaic-side:not(.text-only)::after { content: ""; position: absolute; inset: 30% 0 0; background: linear-gradient(to bottom, transparent, rgba(25,38,35,.84)); }
.mosaic-main > div, .mosaic-side > div { position: absolute; z-index: 2; left: 26px; right: 26px; bottom: 26px; color: var(--white); }
.mosaic-main span, .mosaic-side span { display: block; margin-bottom: 6px; color: #c8f4ec; font-size: .78rem; font-weight: 800; letter-spacing: .09em; }
.mosaic-main h3, .mosaic-side h3 { color: var(--white); font-size: clamp(1.25rem, 2.2vw, 2rem); }
.mosaic-main p { margin-top: 9px; color: rgba(255,255,255,.74); max-width: 620px; }
.mosaic-side { min-height: 250px; }
.mosaic-side.text-only { background: linear-gradient(145deg, #f9e4ca, #f5c995); }
.mosaic-side.text-only > div { position: static; display: flex; height: 100%; flex-direction: column; justify-content: flex-end; padding: 28px; color: var(--ink); }
.mosaic-side.text-only span { color: #8b5a29; }
.mosaic-side.text-only h3 { color: var(--ink); }
.mosaic-side.text-only p { margin-top: 10px; color: #6f5b45; }

.notice-section { padding-top: 36px; }
.notice-card { display: grid; grid-template-columns: .7fr 1.3fr; gap: 40px; align-items: center; padding: 32px 36px; border: 1px solid var(--line); border-radius: 24px; background: rgba(255,255,255,.7); }
.notice-card > p { color: var(--muted); }

.breadcrumbs { margin-bottom: 28px; }
.breadcrumbs ol { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; list-style: none; padding: 0; margin: 0; color: var(--muted); font-size: .86rem; }
.breadcrumbs li:not(:last-child)::after { content: "/"; margin-left: 8px; color: #a9b6b2; }
.breadcrumbs a { text-decoration: none; }
.breadcrumbs a:hover { color: var(--primary-dark); text-decoration: underline; }
.intro-grid { display: grid; grid-template-columns: minmax(0,1.1fr) minmax(320px,.9fr); gap: 56px; align-items: center; }
.intro-grid-reverse { grid-template-columns: minmax(0,1.05fr) minmax(340px,.95fr); }
.intro-grid > img { width: 100%; aspect-ratio: 5 / 4; object-fit: cover; border-radius: 32px; box-shadow: var(--shadow-md); }
.page-intro h1, .desktop-hero h1, .app-hero h1 { font-size: clamp(2.25rem,4.4vw,4.3rem); }

.filter-section { padding-top: 30px; padding-bottom: 24px; }
.filter-head { display: flex; align-items: end; justify-content: space-between; gap: 36px; }
.filter-head > p { max-width: 520px; color: var(--muted); }
.filter-links { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 24px; }
.filter-links a { display: inline-flex; align-items: center; gap: 7px; min-height: 38px; padding: 8px 13px; border: 1px solid var(--line); border-radius: 999px; background: var(--white); color: #52625e; font-size: .86rem; font-weight: 750; text-decoration: none; }
.filter-links a:hover { border-color: var(--primary); color: var(--primary-dark); }
.filter-links a[aria-current="page"] { border-color: transparent; background: var(--primary); color: var(--white); }
.filter-links span { display: inline-flex; min-width: 22px; height: 22px; align-items: center; justify-content: center; border-radius: 999px; background: rgba(0,0,0,.06); font-size: .72rem; }
.filter-links a[aria-current="page"] span { background: rgba(255,255,255,.18); }
.topic-index { padding-top: 28px; }
.result-summary { display: flex; align-items: center; gap: 10px; margin-bottom: 18px; color: var(--muted); }
.result-summary strong { color: var(--primary-dark); }
.topic-list-grid { display: grid; gap: 18px; }
.index-card { display: grid; grid-template-columns: 280px minmax(0,1fr); min-height: 260px; overflow: hidden; border: 1px solid var(--line); border-radius: 26px; background: rgba(255,255,255,.84); scroll-margin-top: calc(var(--header-h) + 20px); }
.index-card figure { min-height: 100%; background: var(--soft); }
.index-card img { width: 100%; height: 100%; min-height: 260px; object-fit: cover; }
.index-card-copy { padding: 26px 30px; }
.index-meta { display: flex; flex-wrap: wrap; gap: 10px 18px; margin-bottom: 8px; color: var(--muted); font-size: .8rem; font-weight: 700; }
.index-meta span:first-child { color: var(--accent); }
.index-card-copy > p { margin-top: 10px; color: #596762; }
.detail-copy { margin-top: 14px; padding-top: 14px; border-top: 1px dashed var(--line-strong); }
.detail-copy p { color: var(--muted); font-size: .93rem; }
.related-strip { display: flex; justify-content: space-between; align-items: end; gap: 30px; padding-top: 36px; }
.related-links { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 8px; }
.related-links a { padding: 10px 14px; border: 1px solid var(--line); border-radius: 999px; background: var(--white); color: var(--primary-dark); font-weight: 800; text-decoration: none; }
.related-links a:hover { border-color: var(--primary); box-shadow: var(--shadow-sm); }

.web-intro { padding-bottom: 54px; }
.steps-section { padding-top: 40px; }
.numbered-steps { list-style: none; padding: 0; margin: 30px 0 0; display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 14px; }
.numbered-steps li { display: grid; grid-template-columns: 54px minmax(0,1fr); gap: 18px; padding: 24px; border: 1px solid var(--line); border-radius: 20px; background: var(--white); }
.numbered-steps li > span { display: flex; width: 46px; height: 46px; align-items: center; justify-content: center; border-radius: 15px; background: var(--soft); color: var(--primary-dark); font-size: .82rem; font-weight: 850; letter-spacing: .08em; }
.numbered-steps p { margin-top: 8px; color: var(--muted); font-size: .92rem; }
.browser-grid-section { padding-top: 66px; }
.browser-cards { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 14px; }
.browser-cards article { min-height: 250px; padding: 26px; border-radius: 24px; background: var(--soft); }
.browser-cards article:nth-child(2) { background: #fff3e4; }
.browser-cards article:nth-child(3) { background: #f2f2ed; }
.browser-cards p { margin-top: 12px; color: var(--muted); }
.browser-cards a { display: inline-flex; margin-top: 22px; color: var(--primary-dark); font-weight: 800; }
.diagnostic-section { display: grid; grid-template-columns: minmax(300px,.8fr) minmax(0,1.2fr); align-items: stretch; gap: 34px; }
.diagnostic-media { min-height: 520px; overflow: hidden; border-radius: 30px; }
.diagnostic-media img { width: 100%; height: 100%; object-fit: cover; }
.diagnostic-copy { padding: 20px 0; }
.diagnostic-list { margin: 26px 0 0; display: grid; gap: 0; }
.diagnostic-list > div { padding: 18px 0; border-top: 1px solid var(--line); }
.diagnostic-list > div:last-child { border-bottom: 1px solid var(--line); }
.diagnostic-list dt { color: var(--ink); font-weight: 850; }
.diagnostic-list dd { margin: 6px 0 0; color: var(--muted); }

.faq-section { padding-top: 58px; }
.accordion { border-top: 1px solid var(--line); }
.accordion-item { border-bottom: 1px solid var(--line); }
.accordion-item h3 { margin: 0; }
.accordion-item button { width: 100%; display: flex; align-items: center; justify-content: space-between; gap: 18px; padding: 20px 4px; border: 0; background: transparent; text-align: left; font-weight: 850; cursor: pointer; }
.accordion-item button i { position: relative; flex: 0 0 28px; width: 28px; height: 28px; border-radius: 50%; background: var(--soft); }
.accordion-item button i::before, .accordion-item button i::after { content: ""; position: absolute; left: 8px; right: 8px; top: 13px; height: 2px; background: var(--primary-dark); transition: transform .2s ease; }
.accordion-item button i::after { transform: rotate(90deg); }
.accordion-item button[aria-expanded="true"] i::after { transform: rotate(0deg); }
.accordion-panel { max-width: 860px; padding: 0 48px 20px 4px; color: var(--muted); }

.desktop-hero { padding-bottom: 56px; }
.desktop-hero-grid { display: grid; grid-template-columns: minmax(0,1.15fr) minmax(350px,.85fr); gap: 52px; align-items: center; }
.desktop-screen-card { overflow: hidden; border: 1px solid #cfe0db; border-radius: 24px; background: var(--white); box-shadow: var(--shadow-lg); }
.screen-toolbar { display: flex; align-items: center; gap: 7px; height: 42px; padding: 0 14px; border-bottom: 1px solid var(--line); background: #f6f8f7; }
.screen-toolbar span { width: 9px; height: 9px; border-radius: 50%; background: #c8d2cf; }
.screen-toolbar span:nth-child(1) { background: #ef8d7b; }
.screen-toolbar span:nth-child(2) { background: #f2c46e; }
.screen-toolbar span:nth-child(3) { background: #78bfae; }
.screen-toolbar strong { margin-left: 8px; color: var(--muted); font-size: .72rem; font-weight: 650; }
.desktop-screen-card img { width: 100%; aspect-ratio: 16 / 10; object-fit: cover; }
.desktop-copy .text-link { margin-top: 22px; }
.tip-board { display: grid; grid-template-columns: repeat(5,minmax(0,1fr)); gap: 12px; }
.tip-board article { min-height: 290px; padding: 22px; border: 1px solid var(--line); border-radius: 22px; background: var(--white); }
.tip-board article:nth-child(even) { transform: translateY(18px); background: var(--soft); }
.tip-board span { display: inline-flex; width: 34px; height: 34px; align-items: center; justify-content: center; margin-bottom: 28px; border-radius: 11px; color: var(--white); background: var(--primary); font-size: .78rem; font-weight: 850; }
.tip-board p { margin-top: 10px; color: var(--muted); font-size: .89rem; }
.desktop-layout-demo { display: grid; grid-template-columns: minmax(0,.8fr) minmax(0,1.2fr); gap: 56px; align-items: center; padding-top: 98px; }
.layout-copy > p:not(.eyebrow) { margin-top: 16px; color: var(--muted); }
.check-list { list-style: none; padding: 0; margin: 24px 0 0; display: grid; gap: 10px; }
.check-list li { position: relative; padding-left: 30px; color: #4f5d59; }
.check-list li::before { content: "✓"; position: absolute; left: 0; top: 2px; width: 20px; height: 20px; display: flex; align-items: center; justify-content: center; border-radius: 50%; background: rgba(47,143,131,.12); color: var(--primary-dark); font-size: .72rem; font-weight: 900; }
.layout-visual { position: relative; }
.layout-visual img { width: 100%; aspect-ratio: 16 / 11; object-fit: cover; border-radius: 30px; box-shadow: var(--shadow-md); }
.layout-caption { position: absolute; left: 24px; right: 24px; bottom: 24px; display: grid; gap: 3px; padding: 15px 18px; border-radius: 15px; background: rgba(250,252,250,.92); backdrop-filter: blur(10px); }
.layout-caption strong { color: var(--ink); }
.layout-caption span { color: var(--muted); font-size: .84rem; }
.keyboard-card { display: grid; grid-template-columns: minmax(0,.8fr) minmax(0,1.2fr); gap: 40px; align-items: center; padding: 42px; border-radius: 30px; background: var(--ink); color: rgba(255,255,255,.72); }
.keyboard-card h2 { color: var(--white); }
.keyboard-card .eyebrow { color: #9bdcd2; }
.keyboard-card p:not(.eyebrow) { margin-top: 14px; }
.key-grid { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 10px; }
.key-grid > span { display: flex; min-height: 88px; align-items: center; justify-content: center; gap: 8px; flex-wrap: wrap; padding: 16px; border: 1px solid rgba(255,255,255,.12); border-radius: 16px; background: rgba(255,255,255,.06); }
kbd { min-width: 38px; padding: 6px 9px; border: 1px solid rgba(255,255,255,.24); border-bottom-width: 3px; border-radius: 8px; background: rgba(0,0,0,.16); color: var(--white); text-align: center; font: inherit; font-size: .82rem; font-weight: 800; }
.key-grid small { flex-basis: 100%; color: rgba(255,255,255,.58); text-align: center; }

.app-hero { padding-bottom: 56px; }
.app-hero-grid { display: grid; grid-template-columns: minmax(0,1fr) minmax(300px,.72fr); gap: 72px; align-items: center; }
.safety-inline { max-width: 720px; margin-top: 24px; padding: 17px 19px; border: 1px solid #edd6c2; border-radius: 15px; background: #fff7ee; color: #645547; }
.safety-inline strong { color: #9a513b; }
.phone-figure { position: relative; justify-self: center; width: min(100%, 370px); padding: 18px; border: 1px solid var(--line); border-radius: 42px; background: var(--white); box-shadow: var(--shadow-lg); }
.phone-figure::before { content: ""; position: absolute; z-index: 2; left: 50%; top: 27px; width: 88px; height: 20px; transform: translateX(-50%); border-radius: 999px; background: rgba(36,51,49,.82); }
.phone-figure img { width: 100%; aspect-ratio: 9 / 16; object-fit: cover; border-radius: 28px; }
.phone-figure figcaption { padding: 14px 4px 2px; color: var(--muted); font-size: .8rem; }
.app-note-grid { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 14px; }
.app-note-grid article { min-height: 280px; padding: 26px; border-radius: 24px; background: var(--soft); }
.app-note-grid article:nth-child(2) { background: #fff0df; }
.app-note-grid article:nth-child(3) { background: #f3f4ee; }
.note-index { display: block; margin-bottom: 44px; color: var(--primary-dark); font-size: .78rem; font-weight: 900; letter-spacing: .15em; }
.app-note-grid p { margin-top: 12px; color: var(--muted); }
.mobile-reading { display: grid; grid-template-columns: minmax(280px,.75fr) minmax(0,1.25fr); align-items: center; gap: 54px; }
.mobile-reading-media { max-width: 420px; justify-self: center; }
.mobile-reading-media img { width: 100%; aspect-ratio: 4 / 5; object-fit: cover; border-radius: 34px; box-shadow: var(--shadow-md); }
.mobile-reading-copy > p:not(.eyebrow) { margin-top: 18px; color: var(--muted); }
.mobile-reading-copy .button { margin-top: 24px; }
.verification-card { padding: 42px; border: 1px solid var(--line); border-radius: 30px; background: var(--white); }
.verification-card { display: grid; grid-template-columns: minmax(0,.75fr) minmax(0,1.25fr); gap: 44px; }
.verification-card ol { list-style: none; padding: 0; margin: 0; display: grid; gap: 0; counter-reset: verify; }
.verification-card li { position: relative; padding: 18px 0 18px 52px; border-top: 1px solid var(--line); counter-increment: verify; }
.verification-card li:last-child { border-bottom: 1px solid var(--line); }
.verification-card li::before { content: counter(verify); position: absolute; left: 0; top: 16px; display: flex; width: 32px; height: 32px; align-items: center; justify-content: center; border-radius: 10px; background: var(--soft); color: var(--primary-dark); font-weight: 900; }
.verification-card strong { display: block; color: var(--ink); }
.verification-card span { display: block; margin-top: 4px; color: var(--muted); font-size: .91rem; }

.not-found { min-height: calc(100vh - 230px); display: grid; grid-template-columns: minmax(0,1fr) minmax(280px,.7fr); align-items: center; gap: 60px; }
.error-code { color: var(--secondary); font-size: clamp(4rem, 10vw, 8rem); font-weight: 900; line-height: 1; letter-spacing: -.06em; }
.not-found h1 { margin-top: 10px; }
.not-found-copy > p:not(.error-code) { max-width: 620px; margin-top: 18px; color: var(--muted); font-size: 1.05rem; }
.not-found > img { width: 100%; aspect-ratio: 1; object-fit: cover; border-radius: 50%; box-shadow: var(--shadow-md); }

.site-footer { margin-top: 86px; background: #21302e; color: rgba(255,255,255,.68); }
.footer-grid { width: min(calc(100% - 48px), var(--content)); margin-inline: auto; display: grid; grid-template-columns: 1.15fr .7fr 1fr; gap: 52px; padding: 62px 0 46px; }
.site-footer h2 { color: var(--white); font-size: 1rem; letter-spacing: 0; }
.site-footer p { margin-top: 12px; max-width: 520px; font-size: .9rem; }
.site-footer ul { list-style: none; padding: 0; margin: 12px 0 0; display: grid; gap: 7px; }
.site-footer a { color: #c2ebe4; text-decoration: none; }
.site-footer a:hover { text-decoration: underline; }
.footer-bottom { width: min(calc(100% - 48px), var(--content)); margin-inline: auto; display: flex; justify-content: space-between; gap: 20px; padding: 18px 0 26px; border-top: 1px solid rgba(255,255,255,.11); font-size: .82rem; }
.footer-bottom p { margin: 0; }

body.has-progress::before { content: ""; position: fixed; z-index: 120; left: 0; top: 0; width: var(--scroll-progress, 0%); height: 3px; background: linear-gradient(90deg, var(--primary), var(--secondary)); transition: width .06s linear; }
.js-filter-flash { animation: filterFlash .55s ease; }
@keyframes filterFlash { 0% { opacity: .45; transform: translateY(5px); } 100% { opacity: 1; transform: none; } }

@media (max-width: 1120px) {
  .tip-board { grid-template-columns: repeat(3,minmax(0,1fr)); }
  .tip-board article:nth-child(even) { transform: none; }
  .home-hero { grid-template-columns: 1fr 410px; gap: 42px; }
  .hero-visual { min-height: 470px; }
  .hero-visual img { height: 420px; }
  .section-heading.heading-wide { grid-template-columns: 1fr 360px; }
}

@media (max-width: 960px) {
  :root { --header-h: 70px; }
  .section-pad { width: min(calc(100% - 36px), var(--content)); padding-block: 58px; }
  .header-inner { width: min(calc(100% - 36px), var(--content)); min-height: var(--header-h); }
  .desktop-nav { display: none; }
  .menu-toggle { display: inline-flex; }
  .mobile-nav-wrap.is-open { display: block; }
  .home-hero, .intro-grid, .intro-grid-reverse, .desktop-hero-grid, .app-hero-grid { grid-template-columns: 1fr; }
  .home-hero { padding-top: 48px; }
  .hero-visual { min-height: 0; }
  .hero-visual img { height: auto; aspect-ratio: 16 / 10; }
  .hero-facts { grid-template-columns: repeat(3,1fr); }
  .featured-topic-grid { grid-template-columns: repeat(2,minmax(0,1fr)); }
  .route-section { width: min(calc(100% - 36px), var(--content)); padding: 44px 34px; }
  .route-grid { grid-template-columns: 1fr; }
  .split-story { grid-template-columns: minmax(280px,.8fr) minmax(0,1.2fr); gap: 40px; }
  .mosaic-grid { grid-template-columns: 1fr 1fr; }
  .mosaic-main { min-height: 460px; }
  .section-heading.heading-wide { grid-template-columns: 1fr; gap: 14px; }
  .section-heading.heading-wide > p { max-width: 720px; }
  .index-card { grid-template-columns: 230px minmax(0,1fr); }
  .browser-cards { grid-template-columns: 1fr; }
  .browser-cards article { min-height: 0; }
  .diagnostic-section { grid-template-columns: 310px minmax(0,1fr); gap: 28px; }
  .numbered-steps { grid-template-columns: 1fr; }
  .desktop-layout-demo { grid-template-columns: 1fr; }
  .keyboard-card { grid-template-columns: 1fr; }
  .app-note-grid { grid-template-columns: 1fr; }
  .app-note-grid article { min-height: 0; }
  .note-index { margin-bottom: 22px; }
  .verification-card { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-grid section:first-child { grid-column: 1 / -1; }
}

@media (max-width: 760px) {
  body { line-height: 1.68; }
  h1 { font-size: clamp(2.2rem, 11vw, 3.45rem); }
  .page-intro h1, .desktop-hero h1, .app-hero h1 { font-size: clamp(2.1rem, 10vw, 3.2rem); }
  .section-pad { width: min(calc(100% - 28px), var(--content)); padding-block: 48px; }
  .narrow-top { padding-top: 28px; }
  .header-inner { width: calc(100% - 28px); }
  .brand-copy small { display: none; }
  .home-hero { padding-top: 40px; }
  .hero-facts { grid-template-columns: 1fr; }
  .hero-facts li { display: flex; align-items: baseline; justify-content: space-between; gap: 16px; }
  .hero-facts span { margin-top: 0; text-align: right; }
  .hero-visual { padding: 10px; border-radius: 28px; }
  .hero-visual img { border-radius: 20px; }
  .hero-visual figcaption { left: 20px; right: 20px; bottom: 20px; }
  .featured-topic-grid { grid-template-columns: 1fr; }
  .route-section { width: calc(100% - 28px); padding: 34px 22px; border-radius: 30px; }
  .split-story { grid-template-columns: 1fr; }
  .split-media { max-width: 520px; }
  .split-media img { aspect-ratio: 16 / 11; }
  .mosaic-grid { grid-template-columns: 1fr; grid-template-rows: none; }
  .mosaic-main { grid-row: auto; min-height: 430px; }
  .mosaic-side { min-height: 250px; }
  .notice-card { grid-template-columns: 1fr; gap: 15px; padding: 26px; }
  .filter-head { align-items: flex-start; flex-direction: column; gap: 12px; }
  .index-card { grid-template-columns: 1fr; }
  .index-card figure { min-height: auto; }
  .index-card img { min-height: 0; aspect-ratio: 16 / 9; }
  .index-card-copy { padding: 22px; }
  .related-strip { align-items: flex-start; flex-direction: column; }
  .related-links { justify-content: flex-start; }
  .diagnostic-section { grid-template-columns: 1fr; }
  .diagnostic-media { min-height: 0; }
  .diagnostic-media img { aspect-ratio: 16 / 10; }
  .tip-board { grid-template-columns: 1fr 1fr; }
  .tip-board article { min-height: 230px; }
  .desktop-layout-demo { padding-top: 58px; }
  .keyboard-card { padding: 28px; }
  .key-grid { grid-template-columns: 1fr; }
  .app-hero-grid { gap: 42px; }
  .phone-figure { width: min(84vw, 350px); }
  .mobile-reading { grid-template-columns: 1fr; }
  .mobile-reading-media { max-width: 360px; }
  .verification-card { padding: 28px; }
  .not-found { grid-template-columns: 1fr; min-height: auto; }
  .not-found > img { max-width: 360px; justify-self: center; }
  .footer-grid { width: calc(100% - 28px); grid-template-columns: 1fr; gap: 34px; padding-top: 48px; }
  .footer-grid section:first-child { grid-column: auto; }
  .footer-bottom { width: calc(100% - 28px); }
}

@media (max-width: 520px) {
  .hero-actions { flex-direction: column; align-items: stretch; }
  .button { width: 100%; }
  .hero-visual figcaption { position: static; margin-top: 10px; background: transparent; color: var(--muted); backdrop-filter: none; padding: 3px 2px 8px; }
  .hero-facts li { display: block; }
  .hero-facts span { margin-top: 2px; text-align: left; }
  .filter-links { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); }
  .filter-links a { justify-content: space-between; }
  .tip-board { grid-template-columns: 1fr; }
  .tip-board article { min-height: 0; }
  .screen-toolbar strong { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
  .footer-bottom { align-items: flex-start; flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}

@media print {
  .site-header, .site-footer, .hero-actions, .filter-links, .related-strip { display: none !important; }
  body { background: #fff; color: #111; }
  .section-pad { width: 100%; padding: 20px 0; }
  .topic-card, .index-card, .route-section, .keyboard-card, .verification-card { break-inside: avoid; box-shadow: none; }
  a { color: #111; text-decoration: underline; }
}

.image-unavailable { position: relative; min-height: 150px; background: var(--soft); }
.image-unavailable::after { content: "图片资源待上传"; position: absolute; inset: 0; display: grid; place-items: center; padding: 20px; color: var(--muted); font-size: .82rem; text-align: center; }
.image-unavailable > img { opacity: 0; }

/* Viewing context components */
.viewing-patterns { padding-top: 54px; }
.pattern-grid { display: grid; grid-template-columns: repeat(4,minmax(0,1fr)); gap: 12px; }
.pattern-card { position: relative; min-height: 250px; padding: 24px; overflow: hidden; border: 1px solid var(--line); border-radius: 22px; background: var(--white); }
.pattern-card::after { content: ""; position: absolute; right: -34px; bottom: -42px; width: 118px; height: 118px; border-radius: 50%; background: rgba(47,143,131,.07); }
.pattern-card:nth-child(even)::after { background: rgba(242,179,111,.13); }
.pattern-card > span { display: inline-flex; padding: 5px 9px; border-radius: 999px; background: var(--soft); color: var(--primary-dark); font-size: .72rem; font-weight: 850; }
.pattern-card h3 { margin-top: 30px; }
.pattern-card p { position: relative; z-index: 1; margin-top: 11px; color: var(--muted); font-size: .91rem; }
.device-matrix-section { padding-top: 42px; }
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 22px; background: var(--white); box-shadow: 0 10px 30px rgba(36,51,49,.04); }
.table-wrap:focus-visible { outline-offset: 5px; }
.device-table { width: 100%; min-width: 860px; border-collapse: collapse; text-align: left; }
.device-table th, .device-table td { padding: 17px 18px; border-bottom: 1px solid var(--line); vertical-align: top; }
.device-table thead th { background: var(--soft); color: var(--ink); font-size: .82rem; letter-spacing: .03em; }
.device-table tbody th { width: 130px; color: var(--primary-dark); font-size: .91rem; }
.device-table tbody td { color: #5b6965; font-size: .88rem; }
.device-table tbody tr:last-child th, .device-table tbody tr:last-child td { border-bottom: 0; }
.device-table tbody tr:hover { background: #fbfdfc; }
.desktop-patterns { padding-top: 52px; }
.desktop-pattern-grid { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 14px; }
.desktop-pattern-grid article { padding: 26px 28px; border: 1px solid var(--line); border-radius: 22px; background: linear-gradient(135deg, rgba(255,255,255,.96), rgba(238,245,242,.75)); }
.desktop-pattern-grid article > span { color: var(--accent); font-size: .74rem; font-weight: 850; letter-spacing: .08em; }
.desktop-pattern-grid h3 { margin-top: 8px; }
.desktop-pattern-grid p { margin-top: 10px; color: var(--muted); font-size: .92rem; }
@media (max-width: 960px) {
  .pattern-grid { grid-template-columns: repeat(2,minmax(0,1fr)); }
}
@media (max-width: 640px) {
  .pattern-grid, .desktop-pattern-grid { grid-template-columns: 1fr; }
  .pattern-card { min-height: 0; }
  .device-matrix-section .compact-heading { margin-bottom: 20px; }
}