:root {
  --ink: #111318;
  --paper: #f7f8f5;
  --white: #ffffff;
  --blue: #1268f3;
  --red: #f1455f;
  --mint: #bff3db;
  --yellow: #ffd65a;
  --line: #d8dde5;
  --muted: #5f6875;
  --shadow: 8px 8px 0 #111318;
}

* { 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;
  line-height: 1.7;
  letter-spacing: 0;
}
body.menu-open { overflow: hidden; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; height: auto; }
button, a { -webkit-tap-highlight-color: transparent; }
.shell { width: min(1160px, calc(100% - 48px)); margin-inline: auto; }
.site-header { position: sticky; top: 0; z-index: 50; background: rgba(247, 248, 245, .96); border-bottom: 2px solid var(--ink); }
.header-inner { min-height: 68px; display: flex; align-items: center; justify-content: space-between; gap: 32px; }
.brand { display: inline-flex; align-items: center; gap: 11px; font-weight: 900; font-size: 19px; }
.brand img { width: 44px; height: 44px; border: 2px solid var(--ink); }
.site-nav { display: flex; align-items: center; gap: 6px; font-size: 14px; font-weight: 700; }
.site-nav a { padding: 9px 13px; border: 1px solid transparent; }
.site-nav a:hover, .site-nav a.active { border-color: var(--ink); background: var(--white); }
.site-nav .nav-download { margin-left: 8px; color: var(--white); background: var(--ink); border-color: var(--ink); }
.site-nav .nav-download:hover { color: var(--ink); background: var(--yellow); }
.menu-toggle { display: none; width: 44px; height: 44px; padding: 11px; background: var(--white); border: 2px solid var(--ink); cursor: pointer; }
.menu-toggle span { display: block; height: 2px; background: var(--ink); margin: 4px 0; }

.hero { overflow: hidden; background: var(--white); border-bottom: 2px solid var(--ink); }
.hero-grid { min-height: 594px; display: grid; grid-template-columns: minmax(0, .93fr) minmax(440px, 1.07fr); align-items: center; gap: 54px; padding-block: 46px; }
.signal-label { display: inline-flex; align-items: center; gap: 9px; margin-bottom: 16px; font-size: 12px; font-weight: 900; letter-spacing: 0; }
.signal-label span { width: 10px; height: 10px; background: var(--red); border: 2px solid var(--ink); }
h1, h2, h3, p { margin-top: 0; }
.hero h1 { max-width: 600px; margin-bottom: 20px; font-size: clamp(44px, 4.4vw, 68px); line-height: 1.08; letter-spacing: 0; }
.hero-copy > p { max-width: 610px; margin-bottom: 25px; color: #444b55; font-size: 17px; }
.hero-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 22px; }
.button { min-height: 48px; display: inline-flex; align-items: center; justify-content: center; padding: 10px 24px; border: 2px solid var(--ink); font-weight: 900; line-height: 1.2; box-shadow: 5px 5px 0 var(--ink); transition: transform .18s ease, box-shadow .18s ease; }
.button:hover { transform: translate(2px, 2px); box-shadow: 3px 3px 0 var(--ink); }
.button-primary { color: var(--white); background: var(--blue); }
.button-light { color: var(--ink); background: var(--white); }
.text-link { font-weight: 800; border-bottom: 2px solid var(--ink); }
.text-link span { color: var(--red); }
.hero-facts { display: grid; grid-template-columns: repeat(3, 1fr); max-width: 500px; margin: 34px 0 0; padding: 16px 0 0; border-top: 1px solid var(--line); list-style: none; }
.hero-facts li { display: grid; gap: 1px; }
.hero-facts strong { font-size: 14px; }
.hero-facts span { color: var(--muted); font-size: 12px; }
.hero-media { position: relative; height: 500px; }
.grid-dots { position: absolute; inset: 3% 3% 3% 10%; background-image: radial-gradient(#9aa4b2 1.4px, transparent 1.4px); background-size: 18px 18px; opacity: .52; }
.lightbox { position: absolute; margin: 0; padding: 25px 8px 8px; background: var(--white); border: 2px solid var(--ink); box-shadow: var(--shadow); }
.lightbox img { width: 100%; max-width: 400px; border: 1px solid #d6dae0; }
.lightbox-main { z-index: 3; left: 50%; top: 50%; width: 235px; transform: translate(-50%, -50%); }
.lightbox-small { z-index: 2; width: 170px; }
.lightbox-small img { height: 302px; object-fit: cover; object-position: top; }
.lightbox-start { left: 1%; top: 12%; transform: rotate(-3deg); }
.lightbox-save { right: 1%; bottom: 7%; transform: rotate(3deg); }
.frame-tab { position: absolute; left: 8px; top: 3px; font-size: 10px; font-weight: 900; }
.lightbox-main .frame-tab { color: var(--blue); }
.lightbox-start .frame-tab { color: var(--red); }
.lightbox-save .frame-tab { color: #00764c; }

.genre-signal { color: var(--white); background: var(--ink); border-bottom: 2px solid var(--ink); }
.signal-track { min-height: 78px; display: grid; grid-template-columns: repeat(6, 1fr); align-items: center; }
.signal-track span { padding: 9px 14px; text-align: center; font-size: 13px; font-weight: 800; border-right: 1px solid #3c414b; }
.signal-track span:last-child { border-right: 0; }
.section { padding-block: 82px; }
.section-heading { display: flex; align-items: center; gap: 14px; margin-bottom: 36px; }
.section-heading h2 { margin: 0; font-size: 34px; line-height: 1.2; }
.section-index { display: inline-grid; place-items: center; width: 42px; height: 34px; color: var(--white); background: var(--red); border: 2px solid var(--ink); font-size: 12px; font-weight: 900; }
.section-showcase { background: var(--mint); border-bottom: 2px solid var(--ink); }
.showcase-grid { display: grid; grid-template-columns: 1.15fr .85fr .85fr; gap: 20px; }
.showcase-item { min-width: 0; display: flex; flex-direction: column; justify-content: space-between; gap: 22px; padding: 24px; background: var(--white); border: 2px solid var(--ink); box-shadow: 6px 6px 0 var(--ink); }
.showcase-wide { display: grid; grid-template-columns: 1fr 190px; align-items: center; }
.showcase-item img { width: min(100%, 210px); max-width: 400px; max-height: 372px; margin-inline: auto; object-fit: contain; }
.showcase-copy h3 { margin-bottom: 9px; font-size: 20px; line-height: 1.35; }
.showcase-copy p { margin-bottom: 0; color: var(--muted); font-size: 14px; }
.tag { display: inline-block; margin-bottom: 16px; padding: 3px 8px; border: 1px solid var(--ink); font-size: 11px; font-weight: 900; }
.tag-blue { color: var(--white); background: var(--blue); }
.tag-red { background: #ff9aaa; }
.tag-mint { background: var(--mint); }
.section-features { background: var(--paper); border-bottom: 2px solid var(--ink); }
.feature-grid { display: grid; grid-template-columns: repeat(4, 1fr); border: 2px solid var(--ink); }
.feature-grid article { position: relative; min-height: 240px; padding: 68px 24px 24px; background: var(--white); border-right: 2px solid var(--ink); }
.feature-grid article:last-child { border-right: 0; }
.feature-grid article:nth-child(2) { background: #e9f1ff; }
.feature-grid article:nth-child(3) { background: #fff1a9; }
.feature-grid article:nth-child(4) { background: #ffdce2; }
.feature-no { position: absolute; top: 19px; left: 22px; display: grid; place-items: center; width: 30px; height: 30px; border: 2px solid var(--ink); font-size: 12px; font-weight: 900; }
.feature-grid h3 { margin-bottom: 10px; font-size: 20px; }
.feature-grid p { margin-bottom: 0; color: #49515d; font-size: 14px; }
.section-checks { color: var(--white); background: var(--ink); border-bottom: 2px solid var(--ink); }
.checks-layout { display: grid; grid-template-columns: 1.2fr .8fr; gap: 72px; align-items: center; }
.light-heading .section-index { color: var(--ink); background: var(--yellow); border-color: var(--white); }
.check-list { display: grid; }
.check-list > div { display: grid; grid-template-columns: 56px 1fr; gap: 18px; align-items: start; padding: 20px 0; border-top: 1px solid #41464f; }
.check-list > div:last-child { border-bottom: 1px solid #41464f; }
.check-list span { color: var(--mint); font-weight: 900; }
.check-list p { margin: 0; color: #d8dde5; }
.check-list strong { color: var(--white); }
.check-panel { padding: 34px; color: var(--ink); background: var(--mint); border: 2px solid var(--white); box-shadow: 8px 8px 0 var(--blue); }
.panel-kicker { font-size: 11px; font-weight: 900; }
.check-panel h3 { margin: 12px 0; font-size: 29px; line-height: 1.2; }
.check-panel p { color: #2c3a36; }
.section-links { background: var(--white); }
.deep-links { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.deep-links a { display: grid; grid-template-columns: 120px 1fr 30px; gap: 20px; align-items: center; min-height: 112px; padding: 22px 26px; border: 2px solid var(--ink); box-shadow: 6px 6px 0 var(--ink); }
.deep-links a:first-child { background: #e9f1ff; }
.deep-links a:last-child { background: #ffdce2; }
.deep-links span { font-size: 12px; font-weight: 900; }
.deep-links strong { font-size: 19px; }
.deep-links i { font-style: normal; font-size: 28px; }
.download-band { padding-block: 42px; background: var(--yellow); border-block: 2px solid var(--ink); }
.download-inner { display: flex; align-items: center; justify-content: space-between; gap: 30px; }
.download-inner span { font-size: 11px; font-weight: 900; }
.download-inner h2 { margin: 3px 0 0; font-size: 29px; line-height: 1.3; }
.site-footer { padding-block: 28px; color: #d7dbe1; background: var(--ink); }
.footer-inner { text-align: center; }
.footer-inner p { margin: 4px 0; font-size: 12px; }

.inner-hero { background: var(--white); border-bottom: 2px solid var(--ink); }
.inner-hero-grid { min-height: 370px; display: grid; grid-template-columns: 1fr 210px; gap: 60px; align-items: center; padding-block: 50px; }
.inner-hero h1 { max-width: 760px; margin-bottom: 18px; font-size: clamp(40px, 4vw, 58px); line-height: 1.12; }
.inner-hero p { max-width: 760px; margin-bottom: 0; color: var(--muted); font-size: 17px; }
.step-counter { min-height: 170px; display: grid; place-items: center; align-content: center; background: var(--mint); border: 2px solid var(--ink); box-shadow: var(--shadow); }
.step-counter strong { font-size: 72px; line-height: 1; }
.step-counter span { font-size: 13px; font-weight: 800; }
.guide-section, .faq-section { background: var(--paper); }
.article-layout { display: grid; grid-template-columns: 230px minmax(0, 760px); justify-content: space-between; gap: 70px; align-items: start; }
.article-nav { position: sticky; top: 94px; display: grid; border: 2px solid var(--ink); background: var(--white); }
.article-nav span { padding: 12px 16px; color: var(--white); background: var(--ink); font-size: 11px; font-weight: 900; }
.article-nav a { padding: 10px 16px; border-top: 1px solid var(--line); font-size: 13px; font-weight: 700; }
.article-nav a:hover { background: var(--mint); }
.guide-block { position: relative; padding: 0 0 48px 70px; scroll-margin-top: 100px; }
.guide-block + .guide-block { padding-top: 48px; border-top: 1px solid var(--line); }
.guide-no { position: absolute; left: 0; top: 2px; display: grid; place-items: center; width: 46px; height: 38px; color: var(--white); background: var(--blue); border: 2px solid var(--ink); font-size: 12px; font-weight: 900; }
.guide-block + .guide-block .guide-no { top: 50px; }
.guide-block h2 { margin-bottom: 16px; font-size: 28px; line-height: 1.3; }
.guide-block p { color: #4e5661; }
.guide-block a:not(.button) { color: var(--blue); font-weight: 800; border-bottom: 1px solid var(--blue); }
.notice { margin-top: 24px; padding: 20px; background: #fff1a9; border: 2px solid var(--ink); }
.notice p { margin: 7px 0 0; }
.article-image { width: 300px; margin: 28px 0 0; padding: 10px; background: var(--white); border: 2px solid var(--ink); box-shadow: 6px 6px 0 var(--ink); }
.article-image img { width: 280px; max-width: 400px; }
.article-image figcaption { padding-top: 9px; color: var(--muted); font-size: 12px; }
.faq-hero .step-counter { background: #ffdce2; }
.faq-layout { display: grid; grid-template-columns: 280px minmax(0, 760px); justify-content: space-between; gap: 70px; align-items: start; }
.faq-aside { position: sticky; top: 94px; padding: 26px; background: var(--mint); border: 2px solid var(--ink); box-shadow: 7px 7px 0 var(--ink); }
.faq-aside > span { font-size: 11px; font-weight: 900; }
.faq-aside h2 { margin: 8px 0 18px; font-size: 26px; }
.faq-aside ol { padding-left: 23px; color: #38433f; }
.faq-aside li { margin-bottom: 8px; }
.faq-list { display: grid; gap: 12px; }
.faq-item { background: var(--white); border: 2px solid var(--ink); }
.faq-question { width: 100%; min-height: 64px; display: flex; align-items: center; justify-content: space-between; gap: 24px; padding: 15px 20px; color: var(--ink); background: transparent; border: 0; text-align: left; font: inherit; font-weight: 900; cursor: pointer; }
.faq-question span { display: flex; align-items: center; gap: 13px; }
.faq-question b { color: var(--blue); font-size: 11px; }
.faq-question i { flex: 0 0 auto; display: grid; place-items: center; width: 28px; height: 28px; border: 2px solid var(--ink); font-style: normal; transition: transform .2s ease; }
.faq-item.open .faq-question { background: #e9f1ff; }
.faq-item.open .faq-question i { transform: rotate(45deg); background: var(--red); }
.faq-answer { padding: 18px 20px 20px 53px; border-top: 1px solid var(--line); }
.faq-answer p { margin: 0; color: #4e5661; }

@media (max-width: 960px) {
  .hero-grid { grid-template-columns: minmax(0, .9fr) minmax(380px, 1.1fr); gap: 28px; }
  .hero-media { transform: scale(.9); transform-origin: center; }
  .showcase-grid { grid-template-columns: 1fr 1fr; }
  .showcase-wide { grid-column: 1 / -1; }
  .feature-grid { grid-template-columns: 1fr 1fr; }
  .feature-grid article:nth-child(2) { border-right: 0; }
  .feature-grid article:nth-child(-n+2) { border-bottom: 2px solid var(--ink); }
  .article-layout, .faq-layout { grid-template-columns: 210px minmax(0, 1fr); gap: 36px; }
}

@media (max-width: 760px) {
  .shell { width: min(100% - 30px, 620px); }
  .header-inner { min-height: 62px; }
  .brand img { width: 40px; height: 40px; }
  .menu-toggle { display: block; }
  .site-nav { position: fixed; inset: 62px 0 auto; display: none; padding: 15px; background: var(--paper); border-bottom: 2px solid var(--ink); box-shadow: 0 8px 0 rgba(17, 19, 24, .18); }
  .site-nav.open { display: grid; }
  .site-nav a { min-height: 46px; display: flex; align-items: center; padding-inline: 16px; border: 1px solid var(--line); background: var(--white); }
  .site-nav .nav-download { margin: 0; justify-content: center; }
  .hero-grid { min-height: 0; grid-template-columns: 1fr; gap: 26px; padding-block: 28px 30px; }
  .hero h1 { max-width: 360px; margin-bottom: 14px; font-size: 38px; line-height: 1.12; }
  .hero-copy > p { margin-bottom: 18px; font-size: 14px; line-height: 1.65; }
  .hero-actions { gap: 18px; }
  .button { min-height: 44px; padding: 9px 19px; }
  .hero-facts { margin-top: 22px; padding-top: 12px; }
  .hero-media { height: 260px; transform: none; }
  .lightbox-main { width: 148px; padding-top: 22px; }
  .lightbox-main img { height: 220px; object-fit: cover; object-position: top; }
  .lightbox-small { width: 105px; padding: 21px 5px 5px; box-shadow: 5px 5px 0 var(--ink); }
  .lightbox-small img { height: 184px; }
  .lightbox-start { left: 5%; top: 7%; }
  .lightbox-save { right: 5%; bottom: 5%; }
  .frame-tab { left: 5px; font-size: 8px; }
  .signal-track { grid-template-columns: repeat(3, 1fr); padding-block: 9px; }
  .signal-track span { padding: 5px 7px; border-right: 0; font-size: 11px; }
  .section { padding-block: 58px; }
  .section-heading { margin-bottom: 26px; }
  .section-heading h2 { font-size: 28px; }
  .showcase-grid { grid-template-columns: 1fr; }
  .showcase-wide { grid-column: auto; grid-template-columns: 1fr 145px; }
  .showcase-item { padding: 19px; }
  .showcase-item img { max-height: 310px; }
  .feature-grid { grid-template-columns: 1fr; }
  .feature-grid article { min-height: 0; border-right: 0; border-bottom: 2px solid var(--ink); }
  .feature-grid article:last-child { border-bottom: 0; }
  .checks-layout { grid-template-columns: 1fr; gap: 42px; }
  .deep-links { grid-template-columns: 1fr; }
  .deep-links a { grid-template-columns: 92px 1fr 24px; padding: 18px; }
  .download-inner { align-items: flex-start; flex-direction: column; }
  .download-inner h2 { font-size: 25px; }
  .inner-hero-grid { min-height: 0; grid-template-columns: 1fr 100px; gap: 20px; padding-block: 38px; }
  .inner-hero h1 { font-size: 36px; }
  .inner-hero p { font-size: 14px; }
  .step-counter { min-height: 110px; box-shadow: 5px 5px 0 var(--ink); }
  .step-counter strong { font-size: 48px; }
  .step-counter span { font-size: 10px; }
  .article-layout, .faq-layout { display: block; }
  .article-nav { position: static; grid-template-columns: 1fr 1fr; margin-bottom: 45px; }
  .article-nav span { grid-column: 1 / -1; }
  .faq-aside { position: static; margin-bottom: 38px; }
  .guide-block { padding-left: 58px; }
  .faq-answer { padding-left: 20px; }
}

@media (max-width: 430px) {
  .brand { font-size: 17px; }
  .hero h1 { max-width: 330px; font-size: 34px; }
  .hero-facts { gap: 8px; }
  .hero-facts strong { font-size: 12px; }
  .hero-facts span { font-size: 10px; }
  .lightbox-start { left: 0; }
  .lightbox-save { right: 0; }
  .showcase-wide { grid-template-columns: 1fr; }
  .showcase-wide img { order: -1; }
  .deep-links a { grid-template-columns: 1fr 24px; }
  .deep-links span { grid-column: 1 / -1; }
  .inner-hero-grid { display: block; }
  .inner-hero h1 { font-size: 32px; }
  .step-counter { width: 116px; min-height: 88px; margin-top: 26px; }
  .guide-block { padding-left: 0; padding-top: 54px; }
  .guide-block:first-child { padding-top: 54px; }
  .guide-no, .guide-block + .guide-block .guide-no { top: 0; }
  .guide-block + .guide-block .guide-no { top: 18px; }
  .article-image { width: min(100%, 300px); }
  .faq-question { padding-inline: 15px; }
  .faq-question span { align-items: flex-start; gap: 9px; }
}