:root {
  --ink: #151515;
  --paper: #f7f8fa;
  --white: #ffffff;
  --line: #c7ccd5;
  --muted: #5b6270;
  --blue: #1648d8;
  --red: #ef3e2f;
  --pale: #e9edf5;
  --max: 1180px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "微软雅黑", Arial, Helvetica, sans-serif; letter-spacing: 0; }
body.menu-open { overflow: hidden; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; height: auto; }
button { font: inherit; }
.section-inner, .header-inner, .hero-inner { width: min(calc(100% - 48px), var(--max)); margin-inline: auto; }
.site-header { position: sticky; top: 0; z-index: 50; background: rgba(247,248,250,.96); border-bottom: 1px solid var(--ink); }
.header-inner { height: 72px; display: flex; align-items: center; justify-content: space-between; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; font-size: 18px; }
.brand img { width: 44px; height: 44px; border: 1px solid var(--ink); object-fit: cover; }
.main-nav { display: flex; align-items: center; gap: 30px; font-size: 14px; font-weight: 700; }
.main-nav a:not(.download-link) { padding: 26px 0 22px; border-bottom: 3px solid transparent; }
.main-nav a.active:not(.download-link), .main-nav a:hover:not(.download-link) { border-color: var(--blue); color: var(--blue); }
.download-link { padding: 11px 18px; color: var(--white); background: var(--ink); border: 1px solid var(--ink); }
.menu-toggle { display: none; width: 44px; height: 44px; border: 1px solid var(--ink); background: transparent; padding: 10px; }
.menu-toggle span { display: block; height: 2px; background: var(--ink); margin: 5px 0; }
.hero { background: var(--white); border-bottom: 1px solid var(--ink); }
.hero-inner { min-height: 620px; display: grid; grid-template-columns: minmax(0, .92fr) minmax(520px, 1.08fr); align-items: center; gap: 64px; padding-block: 48px; }
.issue-mark { display: inline-block; font-size: 12px; font-weight: 800; color: var(--blue); border-top: 3px solid var(--blue); padding-top: 7px; margin-bottom: 20px; }
h1, h2, h3, p { margin-top: 0; }
.hero h1 { max-width: 560px; margin-bottom: 20px; font-size: clamp(44px, 4.2vw, 68px); line-height: 1.04; letter-spacing: 0; }.hero h1 span, .subhero h1 span { display: block; }
.hero-copy > p { max-width: 570px; margin-bottom: 28px; color: var(--muted); line-height: 1.85; font-size: 16px; }
.hero-actions { display: flex; align-items: center; gap: 24px; margin-bottom: 30px; }
.primary-btn { display: inline-flex; min-width: 132px; height: 48px; align-items: center; justify-content: center; padding: 0 22px; color: var(--white); background: var(--red); border: 1px solid var(--ink); box-shadow: 4px 4px 0 var(--ink); font-weight: 800; }
.primary-btn:hover { transform: translate(2px, 2px); box-shadow: 2px 2px 0 var(--ink); }
.text-link { font-size: 14px; font-weight: 800; border-bottom: 1px solid var(--ink); padding-bottom: 4px; }
.hero-facts { display: grid; grid-template-columns: repeat(3, 1fr); max-width: 500px; margin: 0; border-top: 1px solid var(--line); }
.hero-facts div { padding: 14px 12px 0 0; }
.hero-facts dt { color: var(--muted); font-size: 11px; font-weight: 800; }
.hero-facts dd { margin: 5px 0 0; font-size: 13px; font-weight: 800; }
.hero-media { width: 100%; align-self: center; }
.drawer-label { display: flex; justify-content: space-between; align-items: center; border-bottom: 3px solid var(--blue); padding: 0 0 8px; font-size: 11px; color: var(--blue); }
.screen-drawers { height: 468px; display: grid; grid-template-columns: 1.25fr .9fr .9fr; align-items: end; gap: 10px; padding: 18px 18px 0; background: repeating-linear-gradient(0deg, transparent 0, transparent 55px, #d9dde6 56px); border-left: 1px solid var(--line); border-right: 1px solid var(--line); }
.screen-drawer { position: relative; margin: 0; display: flex; align-items: center; justify-content: center; height: 100%; border: 1px solid var(--ink); border-bottom: 0; background: var(--pale); padding: 24px 8px; overflow: hidden; }
.screen-drawer img { max-width: 400px; width: auto; height: 100%; object-fit: contain; object-position: center; }
.drawer-b { height: 88%; }.drawer-c { height: 76%; }
.screen-number { position: absolute; z-index: 2; top: 7px; left: 8px; display: grid; place-items: center; width: 27px; height: 27px; color: var(--white); background: var(--red); border-radius: 50%; font-size: 10px; font-weight: 800; }
.category-band { background: var(--blue); color: var(--white); border-bottom: 1px solid var(--ink); }
.category-layout { display: grid; grid-template-columns: 170px 1fr; gap: 30px; padding-block: 34px; }
.section-kicker { font-size: 11px; font-weight: 800; color: #b9c8ff; }
.category-layout h2 { font-size: 26px; margin-bottom: 22px; }
.category-matrix { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid rgba(255,255,255,.45); }
.category-matrix div { min-width: 0; padding: 18px 18px 4px 0; }
.category-matrix b, .category-matrix span, .category-matrix small { display: block; }
.category-matrix b { color: #aebfff; font-size: 11px; }
.category-matrix span { margin: 8px 0 5px; font-weight: 800; }
.category-matrix small { color: #dce4ff; line-height: 1.6; }
.section { padding-block: 88px; border-bottom: 1px solid var(--ink); }
.section-heading { display: flex; align-items: baseline; gap: 18px; margin-bottom: 42px; border-bottom: 1px solid var(--ink); padding-bottom: 18px; }
.section-heading span { color: var(--red); font-size: 12px; font-weight: 800; }
.section-heading h2 { margin: 0; font-size: 36px; }
.feature-grid { display: grid; grid-template-columns: repeat(4, 1fr); border-left: 1px solid var(--line); border-top: 1px solid var(--line); }
.feature-item { min-height: 250px; padding: 28px 24px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); background: var(--white); }
.feature-item > b { font-size: 11px; color: var(--blue); }
.feature-item h3 { margin: 50px 0 14px; font-size: 20px; }
.feature-item p { margin: 0; color: var(--muted); line-height: 1.8; font-size: 14px; }
.gallery-section { background: #eceff4; }
.gallery-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.gallery-list figure { margin: 0; min-width: 0; }
.gallery-list img { width: 100%; max-width: 400px; height: 520px; margin: 0 auto; object-fit: contain; object-position: center bottom; background: #dfe3ea; border: 1px solid var(--ink); }
.gallery-list figcaption { display: grid; gap: 7px; margin-top: 14px; padding-top: 13px; border-top: 3px solid var(--blue); }
.gallery-list figcaption b { font-size: 14px; }.gallery-list figcaption span { color: var(--muted); font-size: 13px; line-height: 1.65; }
.bridge-section { padding-block: 0; background: var(--white); border-bottom: 1px solid var(--ink); }
.bridge-grid { display: grid; grid-template-columns: repeat(2, 1fr); }
.bridge-grid article { padding: 62px 58px 62px 0; }
.bridge-grid article + article { padding-left: 58px; border-left: 1px solid var(--ink); }
.bridge-no { color: var(--blue); font-size: 11px; font-weight: 800; }
.bridge-grid h2 { margin: 28px 0 13px; font-size: 32px; }.bridge-copy { margin-bottom: 16px; color: var(--muted); line-height: 1.8; }.bridge-grid a { font-weight: 800; color: var(--blue); }
.download-band { padding-block: 54px; background: var(--ink); color: var(--white); }
.download-layout { display: flex; align-items: center; justify-content: space-between; gap: 30px; }.download-layout span { color: #9fb5ff; font-size: 11px; font-weight: 800; }.download-layout h2 { margin: 8px 0 0; font-size: 32px; }.primary-btn.inverse { color: var(--ink); background: var(--white); border-color: var(--white); box-shadow: 4px 4px 0 var(--red); }
.site-footer { padding-block: 28px; background: #090909; color: #b7bac2; text-align: center; font-size: 12px; }.site-footer p { margin: 5px auto; max-width: 900px; line-height: 1.7; }
.subhero { padding-block: 58px; background: var(--white); border-bottom: 1px solid var(--ink); }
.subhero-grid { display: grid; grid-template-columns: 1.2fr .8fr; align-items: center; gap: 70px; }
.subhero h1 { max-width: 700px; margin-bottom: 18px; font-size: clamp(42px, 5vw, 68px); line-height: 1.08; }.subhero p { max-width: 650px; margin-bottom: 0; color: var(--muted); line-height: 1.85; }
.subhero-index { list-style: none; margin: 0; padding: 0; border-top: 3px solid var(--blue); }.subhero-index li { display: grid; grid-template-columns: 52px 1fr; padding: 14px 0; border-bottom: 1px solid var(--line); font-weight: 800; }.subhero-index b { color: var(--red); font-size: 11px; }
.manual-section { padding-block: 70px; }.manual-layout { display: grid; grid-template-columns: 190px 1fr; gap: 70px; align-items: start; }.manual-nav { position: sticky; top: 100px; display: grid; gap: 13px; border-top: 3px solid var(--blue); padding-top: 14px; font-size: 13px; }.manual-nav > span { color: var(--blue); font-size: 11px; font-weight: 800; }.manual-nav a { padding: 7px 0; border-bottom: 1px solid var(--line); }.manual-nav a:hover { color: var(--blue); }
.manual-step { scroll-margin-top: 100px; display: grid; grid-template-columns: 76px 1fr; gap: 30px; padding: 0 0 48px; margin-bottom: 48px; border-bottom: 1px solid var(--line); }.step-no { display: grid; place-items: center; width: 58px; height: 58px; color: var(--white); background: var(--blue); border-radius: 50%; font-weight: 800; }.manual-step h2 { font-size: 30px; margin-bottom: 18px; }.manual-step p { color: #373c47; line-height: 2; }.manual-step a { color: var(--blue); text-decoration: underline; }.manual-action { display: flex; justify-content: space-between; align-items: center; gap: 24px; padding: 28px; background: var(--pale); border: 1px solid var(--ink); }.manual-action div { display: grid; gap: 6px; }.manual-action span { color: var(--muted); font-size: 13px; }
.diagnostic { display: grid; grid-template-columns: repeat(2, 1fr); border-top: 3px solid var(--blue); }.diagnostic span { grid-column: 1 / -1; padding: 10px 0; color: var(--blue); font-size: 11px; font-weight: 800; }.diagnostic b { padding: 17px 10px; border: 1px solid var(--line); margin: -1px 0 0 -1px; font-size: 14px; }
.faq-section { padding-block: 76px; }.faq-layout { display: grid; grid-template-columns: 300px 1fr; gap: 80px; align-items: start; }.faq-intro { position: sticky; top: 105px; }.faq-intro > span { color: var(--blue); font-size: 11px; font-weight: 800; }.faq-intro h2 { margin: 18px 0; font-size: 36px; }.faq-intro p { color: var(--muted); line-height: 1.8; }.faq-intro a { color: var(--blue); font-weight: 800; font-size: 14px; }
.faq-list { border-top: 1px solid var(--ink); }.faq-item { border-bottom: 1px solid var(--ink); }.faq-item button { width: 100%; display: flex; justify-content: space-between; align-items: center; gap: 20px; min-height: 70px; padding: 18px 4px; border: 0; background: transparent; color: var(--ink); text-align: left; font-weight: 800; cursor: pointer; }.faq-item button i { display: grid; flex: 0 0 30px; place-items: center; width: 30px; height: 30px; background: var(--blue); color: var(--white); border-radius: 50%; font-style: normal; }.faq-answer { padding: 0 58px 22px 4px; }.faq-answer p { margin: 0; color: var(--muted); line-height: 1.9; }.faq-answer a { color: var(--blue); text-decoration: underline; }
@media (max-width: 900px) {
  .hero-inner { grid-template-columns: minmax(0, 1fr) minmax(420px, .95fr); gap: 34px; }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .category-matrix { grid-template-columns: repeat(2, 1fr); }
  .faq-layout { grid-template-columns: 230px 1fr; gap: 40px; }
}
@media (max-width: 720px) {
  .section-inner, .header-inner, .hero-inner { width: min(calc(100% - 32px), var(--max)); }
  .site-header { position: relative; }.header-inner { height: 64px; }.brand img { width: 38px; height: 38px; }.menu-toggle { display: block; }
  .main-nav { position: absolute; z-index: 60; display: none; top: 64px; left: 0; right: 0; padding: 14px 16px 20px; background: var(--paper); border-bottom: 1px solid var(--ink); box-shadow: 0 16px 30px rgba(0,0,0,.12); }.main-nav.open { display: grid; gap: 0; }.main-nav a:not(.download-link) { padding: 14px 4px; border-bottom: 1px solid var(--line); }.download-link { margin-top: 12px; text-align: center; }
  .hero-inner { min-height: 0; grid-template-columns: 1fr; gap: 24px; padding-block: 30px 34px; }.hero h1 { font-size: 39px; max-width: 100%; }.hero-copy > p { font-size: 14px; line-height: 1.75; margin-bottom: 20px; }.hero-actions { margin-bottom: 22px; }.hero-facts { display: none; }
  .drawer-label { padding-bottom: 6px; }.screen-drawers { height: 230px; padding: 12px 10px 0; gap: 6px; }.screen-drawer { padding: 18px 4px; }.screen-number { width: 21px; height: 21px; top: 4px; left: 4px; font-size: 8px; }
  .category-layout { grid-template-columns: 1fr; gap: 12px; padding-block: 26px; }.category-layout h2 { margin-bottom: 14px; }.category-matrix div { padding: 12px 12px 4px 0; }.category-matrix small { display: none; }
  .section { padding-block: 54px; }.section-heading { margin-bottom: 24px; }.section-heading h2 { font-size: 30px; }.feature-grid { grid-template-columns: 1fr 1fr; }.feature-item { min-height: 205px; padding: 20px 16px; }.feature-item h3 { margin-top: 30px; font-size: 17px; }.feature-item p { font-size: 13px; }
  .gallery-list { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 8px; }.gallery-list img { height: 228px; }.gallery-list figcaption span { display: none; }.gallery-list figcaption b { font-size: 11px; }
  .bridge-grid { grid-template-columns: 1fr; }.bridge-grid article, .bridge-grid article + article { padding: 42px 0; border-left: 0; }.bridge-grid article + article { border-top: 1px solid var(--ink); }.bridge-grid h2 { margin-top: 18px; font-size: 27px; }
  .download-band { padding-block: 38px; }.download-layout { align-items: flex-start; flex-direction: column; }.download-layout h2 { font-size: 25px; }
  .subhero { padding-block: 38px; }.subhero-grid { grid-template-columns: 1fr; gap: 30px; }.subhero h1 { font-size: 39px; }.subhero p { font-size: 14px; }.subhero-index { display: grid; grid-template-columns: 1fr 1fr; }.subhero-index li { grid-template-columns: 38px 1fr; font-size: 12px; }
  .manual-section { padding-block: 46px; }.manual-layout { grid-template-columns: 1fr; gap: 38px; }.manual-nav { position: static; grid-template-columns: repeat(5, 1fr); gap: 0; overflow-x: auto; }.manual-nav > span { grid-column: 1 / -1; }.manual-nav a { min-width: 70px; text-align: center; }.manual-step { grid-template-columns: 45px 1fr; gap: 14px; margin-bottom: 36px; padding-bottom: 36px; }.step-no { width: 42px; height: 42px; font-size: 12px; }.manual-step h2 { font-size: 24px; }.manual-step p { font-size: 14px; line-height: 1.9; }.manual-action { align-items: flex-start; flex-direction: column; }
  .faq-section { padding-block: 48px; }.faq-layout { grid-template-columns: 1fr; gap: 35px; }.faq-intro { position: static; }.faq-intro h2 { font-size: 30px; }.faq-item button { font-size: 14px; }.faq-answer { padding-right: 6px; }.faq-answer p { font-size: 14px; }
}
@media (max-width: 390px) {
  .hero h1, .subhero h1 { font-size: 36px; }.hero-actions { gap: 14px; }.text-link { font-size: 12px; }.primary-btn { min-width: 122px; }.screen-drawers { height: 215px; }.feature-grid { grid-template-columns: 1fr; }.feature-item { min-height: 170px; }.gallery-list img { height: 210px; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }