:root {
    --bg: #070a0a;
    --surface: #101615;
    --surface-2: #151d1b;
    --line: rgba(255,255,255,.13);
    --text: #f4faf8;
    --muted: #9aaba7;
    --green: #19df82;
    --cyan: #78e8ed;
    --yellow: #f2c94c;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 96px; }
body { margin: 0; color: var(--text); background: var(--bg); font-family: -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif; letter-spacing: 0; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
.container { width: min(1220px, calc(100% - 40px)); margin: 0 auto; }
.site-header { position: sticky; top: 0; z-index: 20; border-bottom: 1px solid var(--line); background: rgba(6,10,9,.86); backdrop-filter: blur(18px); }
.nav { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand img { width: 158px; height: 44px; object-fit: contain; }
.nav-links { display: flex; align-items: center; gap: 26px; color: var(--muted); font-size: 14px; }
.nav-links a:hover { color: #fff; }
.nav-action { padding: 10px 17px; border-radius: 6px; background: var(--green); color: #06100d !important; font-weight: 800; }
.guide-hero { padding: 86px 0 54px; background: linear-gradient(135deg, rgba(16,42,34,.94), #080b0b 54%, rgba(24,33,31,.95)); border-bottom: 1px solid var(--line); }
.hero-layout { display: grid; grid-template-columns: minmax(0,1fr) minmax(390px,.82fr); align-items: center; gap: 70px; }
.kicker,.chapter-heading p,.section-heading p { color: var(--green); font-size: 12px; font-weight: 900; margin: 0 0 12px; }
h1 { margin: 0; font-size: clamp(42px,6vw,76px); line-height: 1.06; }
h1 span { color: var(--cyan); }
.guide-hero p { color: #bcc9c6; max-width: 680px; line-height: 1.85; font-size: 18px; margin: 24px 0 30px; }
.hero-actions,.final-cta div div { display: flex; gap: 12px; flex-wrap: wrap; }
.button-primary,.button-secondary { display: inline-flex; align-items: center; justify-content: center; min-height: 48px; padding: 0 23px; border-radius: 6px; font-weight: 850; }
.button-primary { background: var(--green); color: #06100d; }
.button-secondary { border: 1px solid var(--line); background: rgba(255,255,255,.07); }
.hero-visual { position: relative; border: 1px solid var(--line); background: #0b0f0e; padding: 12px; border-radius: 8px; }
.hero-visual img { width: 100%; aspect-ratio: 16/10; object-fit: cover; border-radius: 4px; }
.flow-strip { display: flex; align-items: center; justify-content: center; gap: 9px; padding: 15px 4px 4px; color: #d8e5e1; font-size: 13px; font-weight: 800; }
.flow-strip i { width: 28px; height: 1px; background: var(--green); }
.quick-start { border-bottom: 1px solid var(--line); background: #0b100f; }
.quick-grid { display: grid; grid-template-columns: repeat(3,1fr); }
.quick-grid div { padding: 25px 28px; border-right: 1px solid var(--line); }
.quick-grid div:last-child { border-right: 0; }
.quick-grid strong,.quick-grid span { display: block; }
.quick-grid strong { color: var(--green); margin-bottom: 8px; }
.quick-grid span { color: var(--muted); font-size: 14px; line-height: 1.7; }
.guide-section { padding: 64px 0 100px; }
.guide-layout { display: grid; grid-template-columns: 245px minmax(0,1fr); gap: 54px; align-items: start; }
.chapter-nav { position: sticky; top: 98px; border-left: 1px solid var(--line); }
.chapter-nav-title { padding: 0 0 16px 18px; color: var(--muted); font-size: 12px; font-weight: 800; }
.chapter-nav a { display: flex; gap: 13px; padding: 12px 8px 12px 18px; border-left: 2px solid transparent; margin-left: -1px; color: var(--muted); }
.chapter-nav a.active,.chapter-nav a:hover { border-left-color: var(--green); color: #fff; background: rgba(25,223,130,.06); }
.chapter-nav a > span { color: var(--green); font: 800 12px monospace; padding-top: 2px; }
.chapter-nav strong,.chapter-nav small { display: block; }
.chapter-nav small { color: #73827e; margin-top: 4px; font-size: 11px; }
.guide-content { min-width: 0; }
.chapter { padding: 14px 0 78px; border-bottom: 1px solid var(--line); margin-bottom: 62px; }
.chapter:last-child { margin-bottom: 0; }
.chapter-heading { display: flex; align-items: center; gap: 18px; margin-bottom: 18px; }
.chapter-heading > span { display: grid; place-items: center; width: 50px; height: 50px; flex: 0 0 auto; border: 1px solid rgba(25,223,130,.48); color: var(--green); font: 900 17px monospace; }
.chapter-heading p { margin-bottom: 4px; }
h2 { margin: 0; font-size: clamp(28px,4vw,42px); line-height: 1.2; }
h3 { margin: 0; font-size: 19px; }
.lead { color: #b4c3bf; font-size: 17px; line-height: 1.9; margin: 0 0 28px; }
.instruction-grid { display: grid; grid-template-columns: .82fr 1.18fr; gap: 24px; align-items: stretch; }
.instruction-grid.reverse { grid-template-columns: .9fr 1.1fr; }
.steps ol { list-style: none; padding: 0; margin: 0; border-top: 1px solid var(--line); }
.steps li { padding: 16px 0; border-bottom: 1px solid var(--line); }
.steps strong,.steps span { display: block; }
.steps strong { margin-bottom: 6px; }
.steps span { color: var(--muted); font-size: 14px; line-height: 1.65; }
.ui-shot { min-height: 350px; border: 1px solid var(--line); background: #0d1211; border-radius: 8px; overflow: hidden; box-shadow: 0 20px 50px rgba(0,0,0,.28); }
.shot-bar { height: 42px; padding: 0 14px; display: flex; align-items: center; gap: 7px; border-bottom: 1px solid var(--line); color: var(--muted); }
.shot-bar span { width: 8px; height: 8px; border-radius: 50%; background: #46524f; }
.shot-bar b { margin-left: auto; font-size: 12px; }
.shot-body { padding: 24px; }
.shot-body label,.shot-form span { color: var(--muted); font-size: 12px; }
.fake-textarea { min-height: 112px; margin: 9px 0 16px; padding: 14px; border: 1px solid var(--line); color: #7f908b; line-height: 1.7; }
.fake-row { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-bottom: 18px; }
.fake-row div { padding: 13px; background: rgba(255,255,255,.055); color: var(--muted); font-size: 12px; }
.fake-row b { display: block; color: #fff; margin-top: 4px; }
.fake-button { padding: 12px 16px; width: fit-content; margin-left: auto; background: var(--green); color: #06100d; border-radius: 4px; font-weight: 850; font-size: 13px; }
.note { margin-top: 22px; padding: 16px 18px; border-left: 3px solid var(--green); background: rgba(25,223,130,.075); color: #bac9c5; line-height: 1.75; }
.note strong { color: var(--green); margin-right: 8px; }
.note.warning { border-left-color: var(--yellow); background: rgba(242,201,76,.07); }
.note.warning strong { color: var(--yellow); }
.media-callout,.export-layout { display: grid; grid-template-columns: .8fr 1.2fr; gap: 28px; align-items: center; }
.media-callout img,.export-layout img { width: 100%; aspect-ratio: 4/5; object-fit: cover; border-radius: 8px; border: 1px solid var(--line); }
.media-callout ul { padding-left: 20px; color: #becbc8; line-height: 1.9; }
.media-callout p { color: var(--muted); line-height: 1.8; }
.asset-columns,.model-modes { display: grid; grid-template-columns: repeat(3,1fr); gap: 14px; }
.asset-columns > div,.model-modes > div { border-top: 2px solid var(--green); padding: 20px 18px; background: var(--surface); }
.asset-index { color: var(--green); font: 900 12px monospace; }
.asset-columns h3,.model-modes h3 { margin-top: 18px; }
.asset-columns p,.model-modes p { color: var(--muted); line-height: 1.75; font-size: 14px; }
.asset-columns b { color: var(--cyan); font-size: 12px; line-height: 1.6; }
.storyboard-shot { display: grid; grid-template-columns: 54px minmax(0,1fr); grid-template-rows: 1fr auto; }
.shot-side { grid-row: 1/3; padding: 10px; border-right: 1px solid var(--line); display: flex; flex-direction: column; gap: 8px; }
.shot-side b { padding: 10px 0; text-align: center; color: var(--muted); background: rgba(255,255,255,.05); font-size: 11px; }
.shot-side b.active { color: #07100d; background: var(--green); }
.shot-preview { min-height: 250px; padding: 12px; background: #080b0a; }
.shot-preview img { width: 100%; height: 100%; object-fit: contain; }
.shot-form { padding: 14px; border-top: 1px solid var(--line); }
.shot-form p { margin: 8px 0 12px; color: var(--muted); font-size: 12px; line-height: 1.55; }
.resource-tip { display: grid; grid-template-columns: repeat(3,1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); margin-top: 20px; }
.resource-tip div { background: var(--surface); padding: 16px; }
.resource-tip strong,.resource-tip span { display: block; }
.resource-tip strong { color: var(--green); }
.resource-tip span { color: var(--muted); margin-top: 7px; font-size: 12px; line-height: 1.6; }
.compare-table { border: 1px solid var(--line); }
.compare-table > div { display: grid; grid-template-columns: .7fr 1fr 1fr; border-bottom: 1px solid var(--line); }
.compare-table > div:last-child { border-bottom: 0; }
.compare-table span,.compare-table b,.compare-table strong { padding: 15px; }
.compare-table span { color: var(--muted); }
.compare-table b { border-left: 1px solid var(--line); font-size: 14px; }
.compare-head { background: var(--surface-2); }
.compare-head strong { color: var(--green); border-left: 1px solid var(--line); }
.model-modes { grid-template-columns: repeat(2,1fr); }
.check-item { display: flex; gap: 14px; padding: 15px 0; border-bottom: 1px solid var(--line); }
.check-item span { display: grid; place-items: center; width: 30px; height: 30px; flex: 0 0 auto; color: #07100d; background: var(--green); font-weight: 900; }
.check-item p { margin: 2px 0 0; color: var(--muted); line-height: 1.65; }
.check-item strong { color: #fff; margin-right: 6px; }
.faq-section { padding: 80px 0; border-top: 1px solid var(--line); background: #0a0f0e; }
.section-heading { margin-bottom: 26px; }
.faq-grid { display: grid; grid-template-columns: repeat(2,1fr); gap: 12px; }
details { border: 1px solid var(--line); background: var(--surface); padding: 17px 18px; border-radius: 6px; }
summary { cursor: pointer; font-weight: 800; }
details p { color: var(--muted); line-height: 1.75; margin: 14px 0 0; font-size: 14px; }
.final-cta { padding: 78px 0; text-align: center; background: linear-gradient(135deg, rgba(25,223,130,.16), rgba(120,232,237,.06)); border-top: 1px solid var(--line); }
.final-cta p { color: var(--green); font-weight: 800; }
.final-cta h2 { margin-bottom: 26px; }
.final-cta div div { justify-content: center; }
.footer { padding: 24px 0; color: var(--muted); border-top: 1px solid var(--line); font-size: 13px; }
@media (max-width: 980px) {
    .hero-layout,.guide-layout { grid-template-columns: 1fr; }
    .chapter-nav { display: none; }
    .quick-grid,.asset-columns { grid-template-columns: 1fr; }
    .quick-grid div { border-right: 0; border-bottom: 1px solid var(--line); }
}
@media (max-width: 720px) {
    .container { width: min(100% - 24px,1220px); }
    .nav { min-height: 64px; }
    .brand img { width: 128px; }
    .nav-links > a:not(.nav-action) { display: none; }
    .guide-hero { padding-top: 50px; }
    .hero-layout { gap: 34px; }
    .instruction-grid,.instruction-grid.reverse,.media-callout,.export-layout,.faq-grid,.model-modes { grid-template-columns: 1fr; }
    .resource-tip { grid-template-columns: 1fr; }
    .compare-table { overflow-x: auto; }
    .compare-table > div { min-width: 620px; }
    .chapter { padding-bottom: 52px; margin-bottom: 42px; }
}