/* Hallmark · shape: editorial split index · genre: editorial · theme: Studio (deal 3/3, seed android-lkquanpifumeihuagw-55c3·51c26525·2026-11-07·r0) · job: try · draw: target-specific
 * hero: Banner-stage hybrid · nav: edge-aligned quiet bar · footer: mast · imagery: real product screenshots 3 · signature: proof-sheet contact board
 * axes: light/roman-serif/cool · posture: restrained · contrast: pass · fold: pass · v2.0.0 */
/* Hallmark · pre-emit critique: P4 H4 E4 S4 R4 V4 · weakest: V, limited construction marks to useful image framing · hero-review: ship, in-thread · finish-review: ship, in-thread · gap: none */
:root {
  --color-paper: oklch(97% 0.006 215);
  --color-paper-2: oklch(94% 0.009 215);
  --color-paper-3: oklch(90% 0.011 215);
  --color-paper-high: oklch(99% 0.004 215);
  --color-ink: oklch(18% 0.03 250);
  --color-ink-2: oklch(34% 0.022 245);
  --color-muted: oklch(47% 0.02 240);
  --color-rule: oklch(82% 0.012 225);
  --color-accent: oklch(67% 0.16 50);
  --color-accent-ink: oklch(18% 0.03 250);
  --color-focus: oklch(51% 0.17 48);
  --color-dot: oklch(74% 0.014 235 / 0.32);
  --color-shadow: oklch(20% 0.02 250 / 0.15);
  --font-display: Georgia, "Times New Roman", serif;
  --font-body: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "微软雅黑", Arial, Helvetica, sans-serif;
  --space-3xs: 2px;
  --space-2xs: 4px;
  --space-xs: 8px;
  --space-sm: 12px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 40px;
  --space-2xl: 64px;
  --space-3xl: 96px;
  --space-4xl: 144px;
  --container: 1240px;
  --gutter: 32px;
  --radius-control: 4px;
  --radius-card: 3px;
  --text-display: 56px;
  --text-section: 44px;
  --text-title: 24px;
  --text-lead: 19px;
  --text-body: 16px;
  --text-small: 14px;
  --dur-micro: 120ms;
  --dur-short: 220ms;
  --dur-long: 420ms;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

* { box-sizing: border-box; }
html, body { overflow-x: clip; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--color-paper); color: var(--color-ink-2); font-family: var(--font-body); font-size: var(--text-body); line-height: 1.65; letter-spacing: 0; text-wrap: pretty; }
body, button, a { -webkit-tap-highlight-color: transparent; }
img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-underline-offset: 0.2em; }
a:hover { text-decoration-thickness: 2px; }
a:focus-visible, button:focus-visible { outline: 3px solid var(--color-focus); outline-offset: 3px; }
button { font: inherit; }
h1, h2, h3 { margin: 0; color: var(--color-ink); font-family: var(--font-display); font-weight: 400; line-height: 1.08; letter-spacing: 0; overflow-wrap: break-word; min-width: 0; text-wrap: balance; }
h1 { max-width: 15ch; font-size: var(--text-display); }
h2 { max-width: 20ch; font-size: var(--text-section); }
h3 { font-size: var(--text-title); }
p { margin: 0; }
.container, .header-inner, .hero-inner, .footer-inner { width: min(calc(100% - (var(--gutter) * 2)), var(--container)); margin-inline: auto; }
.skip-link { position: fixed; left: var(--space-md); top: var(--space-md); z-index: 500; padding: var(--space-xs) var(--space-md); background: var(--color-ink); color: var(--color-paper); transform: translateY(-160%); transition: transform var(--dur-micro) var(--ease-out); }
.skip-link:focus { transform: translateY(0); }
.proof-field { background-color: var(--color-paper); background-image: radial-gradient(circle at 1px 1px, var(--color-dot) 1px, transparent 1.2px); background-size: 24px 24px; }
.site-header { position: relative; z-index: 300; border-bottom: 1px solid var(--color-rule); background: var(--color-paper-high); }
.header-inner { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: var(--space-lg); }
.brand { display: inline-flex; align-items: center; gap: var(--space-sm); color: var(--color-ink); font-weight: 700; text-decoration: none; white-space: nowrap; }
.brand img { width: 40px; height: 40px; }
.desktop-nav { display: flex; align-items: center; gap: var(--space-xl); }
.desktop-nav a, .mobile-nav a { color: var(--color-ink-2); text-decoration: none; }
.desktop-nav a:hover, .desktop-nav a[aria-current="page"], .mobile-nav a:hover, .mobile-nav a[aria-current="page"] { color: var(--color-ink); text-decoration: underline; text-decoration-color: var(--color-accent); }
.menu-toggle { display: none; width: 44px; height: 44px; padding: var(--space-sm); border: 1px solid var(--color-rule); border-radius: var(--radius-control); background: var(--color-paper); color: var(--color-ink); cursor: pointer; }
.menu-toggle span { display: block; height: 2px; margin-block: var(--space-2xs); background: currentColor; transition: transform var(--dur-short) var(--ease-out), opacity var(--dur-short) var(--ease-out); }
.mobile-nav { padding: var(--space-md) var(--gutter) var(--space-lg); border-top: 1px solid var(--color-rule); background: var(--color-paper-high); }
.mobile-nav a { display: block; padding: var(--space-sm) 0; }
.hero { min-height: 680px; display: flex; align-items: center; border-bottom: 1px solid var(--color-rule); }
.hero-inner { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 6fr); align-items: center; gap: var(--space-3xl); padding-block: var(--space-2xl); }
.hero-copy { min-width: 0; }
.hero-copy p { max-width: 42ch; margin-top: var(--space-lg); font-size: var(--text-lead); color: var(--color-ink-2); }
.hero-actions { display: flex; flex-wrap: wrap; gap: var(--space-sm); margin-top: var(--space-xl); }
.button { min-height: 48px; display: inline-flex; align-items: center; justify-content: center; padding-inline: var(--space-lg); border: 1px solid var(--color-ink); border-radius: var(--radius-control); font-weight: 700; line-height: 1; text-decoration: none; white-space: nowrap; transition: background-color var(--dur-short) var(--ease-out), color var(--dur-short) var(--ease-out), transform var(--dur-micro) var(--ease-out); }
.button:hover { transform: translateY(-1px); }
.button:active { transform: translateY(1px); }
.button-primary { background: var(--color-accent); color: var(--color-accent-ink); }
.button-primary:hover { background: var(--color-paper-high); }
.button-secondary { background: var(--color-paper); color: var(--color-ink); }
.button-secondary:hover { background: var(--color-paper-2); }
.text-link { display: inline-block; margin-top: var(--space-lg); color: var(--color-ink); text-decoration-color: var(--color-accent); }
.contact-sheet { position: relative; min-height: 548px; }
.sheet { position: absolute; margin: 0; padding: var(--space-xs); border: 1px solid var(--color-rule); border-radius: var(--radius-card); background: var(--color-paper-high); box-shadow: 0 18px 42px -24px var(--color-shadow); }
.sheet::before, .sheet::after { content: ""; position: absolute; width: 12px; height: 12px; pointer-events: none; }
.sheet::before { left: -7px; top: -7px; border-top: 1px solid var(--color-accent); border-left: 1px solid var(--color-accent); }
.sheet::after { right: -7px; bottom: -7px; border-right: 1px solid var(--color-accent); border-bottom: 1px solid var(--color-accent); }
.sheet img { width: 100%; max-width: 400px; border-radius: var(--radius-card); }
.sheet-main { left: 25%; top: 0; width: 42%; z-index: 3; }
.sheet-small { width: 34%; }
.sheet-info { left: 0; bottom: 0; z-index: 2; }
.sheet-notice { right: 0; bottom: var(--space-xl); z-index: 1; }
.section { padding-block: var(--space-4xl); }
.section-heading { margin-bottom: var(--space-2xl); }
.preview-index { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); border-top: 1px solid var(--color-ink); }
.preview-index article { min-height: 250px; padding: var(--space-xl) var(--space-lg); border-bottom: 1px solid var(--color-rule); }
.preview-index article + article { border-left: 1px solid var(--color-rule); }
.preview-index p { margin-top: var(--space-md); max-width: 30ch; }
.band-light { background: var(--color-paper-2); }
.feature-layout { display: grid; grid-template-columns: minmax(0, 4fr) minmax(0, 7fr); gap: var(--space-2xl); align-items: start; }
.sticky-heading { position: sticky; top: var(--space-xl); }
.feature-rows { margin: 0; border-top: 1px solid var(--color-ink); }
.feature-rows div { display: grid; grid-template-columns: minmax(0, 2fr) minmax(0, 5fr); gap: var(--space-2xl); padding-block: var(--space-xl); border-bottom: 1px solid var(--color-rule); }
.feature-rows dt { color: var(--color-ink); font-weight: 700; }
.feature-rows dd { margin: 0; }
.notes-layout { display: grid; grid-template-columns: minmax(0, 3fr) minmax(0, 9fr); gap: var(--space-2xl); }
.note-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--space-2xl); }
.note-grid article { padding-top: var(--space-lg); border-top: 3px solid var(--color-accent); }
.note-grid p { margin-top: var(--space-md); }
.inline-command { grid-column: 2; margin-top: var(--space-xl); color: var(--color-ink); text-decoration-color: var(--color-accent); }
.band-ink { background: var(--color-ink); color: var(--color-paper-2); }
.band-ink h2 { color: var(--color-paper); }
.faq-preview-layout { display: grid; grid-template-columns: minmax(0, 4fr) minmax(0, 8fr); gap: var(--space-2xl); }
.faq-short-list { border-top: 1px solid var(--color-paper-3); }
.faq-short-list a { display: grid; grid-template-columns: minmax(0, 3fr) minmax(0, 4fr); gap: var(--space-lg); padding-block: var(--space-lg); border-bottom: 1px solid var(--color-muted); color: var(--color-paper-2); text-decoration: none; }
.faq-short-list a:hover { color: var(--color-paper); }
.download-close { padding-block: var(--space-3xl); border-bottom: 1px solid var(--color-rule); background: var(--color-paper-high); }
.download-close-inner { display: flex; align-items: center; justify-content: space-between; gap: var(--space-2xl); }
.download-close p { margin-top: var(--space-sm); }
.section-note { margin-top: var(--space-sm); }
.site-footer { padding-block: var(--space-3xl); border-top: 1px solid var(--color-rule); }
.footer-inner { text-align: center; }
.footer-brand { display: flex; align-items: center; justify-content: center; gap: var(--space-sm); color: var(--color-ink); }
.footer-brand img { width: 48px; height: 48px; }
.footer-links { display: flex; justify-content: center; flex-wrap: wrap; gap: var(--space-xl); margin-top: var(--space-xl); }
.disclaimer { max-width: 48rem; margin: var(--space-xl) auto 0; color: var(--color-muted); text-align: center; }
.copyright { margin-top: var(--space-md); color: var(--color-muted); text-align: center; }
.inner-hero { min-height: 590px; display: flex; align-items: center; border-bottom: 1px solid var(--color-rule); }
.inner-hero-layout { display: grid; grid-template-columns: minmax(0, 7fr) minmax(0, 3fr); gap: var(--space-2xl); align-items: center; padding-block: var(--space-2xl); }
.inner-hero-layout > div > p { max-width: 50ch; margin-top: var(--space-lg); font-size: var(--text-lead); }
.inner-preview { margin: 0; justify-self: end; max-height: 430px; overflow: hidden; border: 1px solid var(--color-rule); background: var(--color-paper-high); box-shadow: 0 18px 42px -24px var(--color-shadow); }
.inner-preview img { width: auto; max-width: 400px; max-height: 430px; object-fit: cover; object-position: top; }
.article-section { padding-block: var(--space-4xl); }
.article-layout { display: grid; grid-template-columns: minmax(0, 3fr) minmax(0, 8fr); gap: var(--space-2xl); align-items: start; }
.article-index { position: sticky; top: var(--space-xl); display: grid; gap: var(--space-md); padding-top: var(--space-lg); border-top: 1px solid var(--color-ink); }
.article-index a { color: var(--color-ink-2); }
.prose { max-width: 72ch; }
.prose section + section { margin-top: var(--space-3xl); padding-top: var(--space-xl); border-top: 1px solid var(--color-rule); }
.prose h2 { font-size: 38px; }
.prose p, .prose ol { margin-top: var(--space-lg); }
.prose li + li { margin-top: var(--space-md); }
.faq-content { padding-block: var(--space-4xl); }
.faq-layout { display: grid; grid-template-columns: minmax(0, 4fr) minmax(0, 8fr); gap: var(--space-2xl); align-items: start; }
.faq-intro { position: sticky; top: var(--space-xl); }
.faq-intro p { margin-top: var(--space-lg); max-width: 32ch; }
.accordion { border-top: 1px solid var(--color-ink); }
.accordion article { border-bottom: 1px solid var(--color-rule); }
.accordion h3 { font-family: var(--font-display); font-size: 18px; }
.accordion button { width: 100%; min-height: 68px; display: flex; align-items: center; justify-content: space-between; gap: var(--space-lg); padding: var(--space-md) 0; border: 0; background: transparent; color: var(--color-ink); text-align: left; cursor: pointer; }
.accordion button span { flex-shrink: 0; font-size: var(--text-title); transition: transform var(--dur-short) var(--ease-out); }
.accordion button[aria-expanded="true"] span { transform: rotate(45deg); }
.button:disabled, .button[aria-disabled="true"], .menu-toggle:disabled, .accordion button:disabled { opacity: 0.55; cursor: not-allowed; transform: none; }
.answer { padding: 0 0 var(--space-lg); max-width: 68ch; }
.faq-after { grid-column: 2; padding-top: var(--space-xl); }
.compact-hero { min-height: 540px; }
.js [data-reveal] { opacity: 0; transform: translateY(8px); transition: opacity var(--dur-long) var(--ease-out), transform var(--dur-long) var(--ease-out); transition-delay: calc(var(--i, 0) * 40ms); }
.js [data-reveal].is-in { opacity: 1; transform: none; }
::selection { background: var(--color-accent); color: var(--color-accent-ink); }
body { caret-color: var(--color-focus); scrollbar-color: var(--color-muted) var(--color-paper-2); }

@media (max-width: 960px) {
  :root { --gutter: 24px; --text-display: 48px; --text-section: 38px; }
  .desktop-nav { display: none; }
  .menu-toggle { display: block; }
  .hero { min-height: auto; }
  .hero-inner { grid-template-columns: minmax(0, 1fr); gap: var(--space-2xl); padding-block: var(--space-2xl) var(--space-3xl); }
  .contact-sheet { min-height: 500px; }
  .feature-layout, .notes-layout, .faq-preview-layout, .inner-hero-layout, .article-layout, .faq-layout { grid-template-columns: minmax(0, 1fr); gap: var(--space-2xl); }
  .sticky-heading, .article-index, .faq-intro { position: static; }
  .inline-command, .faq-after { grid-column: 1; }
  .inner-preview { justify-self: start; }
  .article-index { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (max-width: 640px) {
  :root { --gutter: 18px; --text-display: 38px; --text-section: 34px; --text-lead: 17px; }
  .header-inner { min-height: 64px; }
  .brand img { width: 36px; height: 36px; }
  .hero-inner { padding-top: var(--space-xl); }
  .hero-actions { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
  .button { padding-inline: var(--space-md); }
  .hero-inner { gap: var(--space-xl); padding-bottom: var(--space-xl); }
  .contact-sheet { min-height: 240px; }
  .sheet-main { left: 32%; width: 36%; }
  .sheet-small { width: 30%; }
  .sheet-notice { bottom: 0; }
  .section { padding-block: var(--space-3xl); }
  .preview-index, .note-grid { grid-template-columns: minmax(0, 1fr); }
  .preview-index article { min-height: 0; }
  .preview-index article + article { border-left: 0; }
  .index-number { margin-bottom: var(--space-lg); }
  .feature-rows div { grid-template-columns: minmax(0, 1fr); gap: var(--space-sm); }
  .faq-short-list a { grid-template-columns: minmax(0, 1fr); gap: var(--space-xs); }
  .download-close-inner { align-items: flex-start; flex-direction: column; }
  .inner-hero { min-height: auto; }
  .inner-hero-layout { padding-block: var(--space-xl) var(--space-2xl); }
  .inner-preview { max-height: 280px; justify-self: center; }
  .inner-preview img { max-height: 280px; }
  .article-section, .faq-content { padding-block: var(--space-3xl); }
  .article-index { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .prose h2 { font-size: 32px; }
  .footer-links { gap: var(--space-lg); }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .js [data-reveal] { opacity: 1; transform: none; }
}