:root {
  --purple: #7c3aed;
  --purple-d: #5b21b6;
  --purple-l: #a78bfa;
  --blue: #2563eb;
  --blue-d: #1d4ed8;
  --blue-l: #60a5fa;
  --ink: #1a1530;
  --ink-2: #2a2150;
  --muted: #6b6480;
  --paper: #faf9ff;
  --panel: #ffffff;
  --line: #e8e4f5;
  --soft: #f3efff;
  --lime: #d9e84a;
  --lime-d: #b8c338;
  --grad: linear-gradient(135deg, var(--purple) 0%, var(--blue) 100%);
  --shadow: 0 24px 70px rgba(60, 30, 120, .14);
  --shadow-sm: 0 8px 24px rgba(60, 30, 120, .08);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
html, body { overflow-x: hidden; }
body {
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans SC", -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  line-height: 1.6;
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: .5;
  z-index: 0;
  background:
    radial-gradient(circle at 12% 18%, rgba(124, 58, 237, .14), transparent 38%),
    radial-gradient(circle at 88% 82%, rgba(37, 99, 235, .14), transparent 38%);
}
body::after {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: .4;
  z-index: 0;
  background-image:
    linear-gradient(rgba(124, 58, 237, .05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(124, 58, 237, .05) 1px, transparent 1px);
  background-size: 22px 22px;
}
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; border: 0; background: none; }
img { display: block; max-width: 100%; }
summary { list-style: none; cursor: pointer; }
summary::-webkit-details-marker { display: none; }
:focus-visible { outline: 3px solid var(--purple-l); outline-offset: 3px; }

/* ===== 1. 浮动圆角导航卡（副标 BUILD WORLD） ===== */
.lb-masthead {
  width: min(1240px, calc(100% - 40px));
  height: 74px;
  margin: 18px auto 0;
  padding: 0 12px 0 15px;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 28px;
  background: rgba(255, 255, 255, .92);
  border: 1px solid rgba(124, 58, 237, .14);
  border-radius: 17px;
  position: relative;
  z-index: 30;
  box-shadow: 0 8px 30px rgba(60, 30, 120, .08);
  backdrop-filter: blur(12px);
}
.lb-brandmark { display: flex; align-items: center; gap: 11px; min-width: max-content; }
.lb-brandmark img { width: 46px; height: 46px; border-radius: 13px; }
.lb-brandmark span { display: grid; gap: 2px; }
.lb-brandmark strong { font-size: 17px; font-weight: 800; }
.lb-brandmark small { font-size: 8px; letter-spacing: 1.6px; color: var(--purple-d); font-weight: 700; }
.lb-nav { display: flex; align-items: center; justify-content: center; gap: 30px; font-size: 14px; color: #4a4360; font-weight: 600; }
.lb-nav a { position: relative; padding: 12px 0; }
.lb-nav a::after { content: ""; position: absolute; height: 2px; left: 0; right: 100%; bottom: 5px; background: var(--grad); transition: right .25s ease; }
.lb-nav a:hover::after { right: 0; }
.lb-header-action { padding: 14px 18px; color: #fff; background: var(--grad); border-radius: 11px; font-size: 14px; font-weight: 700; display: inline-flex; align-items: center; gap: 7px; box-shadow: 0 8px 18px rgba(124, 58, 237, .28); transition: transform .2s, box-shadow .2s; }
.lb-header-action:hover { transform: translateY(-2px); box-shadow: 0 12px 26px rgba(124, 58, 237, .4); }
.lb-nav-toggle { display: none; font-size: 24px; color: var(--ink); justify-self: end; }

/* ===== 2. Hero 左右分栏 + 积木创作工坊装置 ===== */
.lb-hero {
  width: min(1240px, calc(100% - 40px));
  margin: 0 auto;
  padding: 56px 0 60px;
  display: grid;
  grid-template-columns: minmax(340px, .86fr) minmax(560px, 1.14fr);
  align-items: center;
  gap: 48px;
  position: relative;
  z-index: 1;
}
.lb-hero::before { content: "BUILD · CREATE · PLAY"; position: absolute; left: -38px; bottom: 60px; writing-mode: vertical-rl; transform: rotate(180deg); font: 700 10px/1 Arial, sans-serif; letter-spacing: 2.4px; color: #c4bce0; }
.lb-kicker { display: flex; align-items: center; gap: 10px; margin: 0 0 19px; color: var(--purple-d); font-size: 12px; font-weight: 800; letter-spacing: 1.4px; }
.lb-kicker span { width: 27px; height: 2px; background: var(--grad); }
.lb-hero h1 { margin: 0; font-size: clamp(46px, 4.8vw, 62px); line-height: 1.04; letter-spacing: 0; }
.lb-hero h1 em { font-style: normal; background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.lb-hero-subtitle { max-width: 520px; margin: 22px 0 15px; font-size: 23px; font-weight: 700; line-height: 1.58; }
.lb-hero-intro { max-width: 540px; margin: 0; color: var(--muted); font-size: 15px; line-height: 1.85; }
.lb-hero-actions { display: flex; align-items: center; gap: 24px; margin-top: 29px; }
.lb-solid-action { display: inline-flex; align-items: center; gap: 9px; padding: 16px 22px; color: #fff; background: var(--grad); border-radius: 10px; font-size: 15px; font-weight: 800; box-shadow: 0 12px 24px rgba(124, 58, 237, .26); transition: transform .2s, box-shadow .2s; }
.lb-solid-action:hover { transform: translateY(-2px); box-shadow: 0 16px 32px rgba(124, 58, 237, .36); }
.lb-text-action { font-size: 14px; font-weight: 700; border-bottom: 1px solid #b3a8d6; padding: 10px 0 5px; display: inline-flex; align-items: center; gap: 6px; }
.lb-trust-strip { list-style: none; display: flex; gap: 0; margin: 38px 0 0; padding: 18px 0 0; border-top: 1px solid var(--line); }
.lb-trust-strip li { min-width: 110px; display: flex; align-items: center; gap: 9px; padding-right: 15px; margin-right: 15px; border-right: 1px solid var(--line); font-size: 12px; font-weight: 800; }
.lb-trust-strip li:last-child { border: 0; }
.lb-trust-strip i { color: var(--purple); font-size: 18px; }
.lb-trust-strip small { display: block; color: #9089a8; font-size: 9px; font-weight: 500; }

/* 积木创作工坊装置 */
.lb-workshop { margin: 0; position: relative; }
.lb-workshop::before { content: ""; position: absolute; width: 200px; height: 200px; right: -22px; top: -28px; background: var(--grad); border-radius: 50%; z-index: -1; opacity: .16; filter: blur(8px); }
.lb-workshop-chrome { background: linear-gradient(150deg, #1c1338 0%, #2a1d52 55%, #1a2a6b 100%); border: 1px solid #0a0620; border-radius: 18px; overflow: hidden; box-shadow: var(--shadow); transform: rotate(-1deg); }
.lb-workshop-topline { min-height: 48px; padding: 0 17px; display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; color: #fff; border-bottom: 1px solid rgba(124, 58, 237, .32); font-size: 11px; letter-spacing: .7px; }
.lb-window-dots { display: flex; gap: 6px; }
.lb-window-dots i { width: 8px; height: 8px; border-radius: 50%; background: #5a4d80; }
.lb-window-dots i:first-child { background: var(--purple-l); }
.lb-window-dots i:nth-child(2) { background: var(--blue-l); }
.lb-window-dots i:nth-child(3) { background: var(--lime); }
.lb-live-label { justify-self: end; display: flex; align-items: center; gap: 6px; color: #c4bce0; font-size: 10px; font-weight: 700; }
.lb-live-label i { width: 6px; height: 6px; border-radius: 50%; background: var(--lime); box-shadow: 0 0 0 4px rgba(217, 232, 74, .12); }
.lb-workshop-grid { display: grid; grid-template-columns: 78px 1fr; min-height: 360px; }
.lb-palette-nav { padding: 17px 9px; display: grid; align-content: start; gap: 9px; border-right: 1px solid rgba(124, 58, 237, .32); }
.lb-palette-block { width: 100%; height: 38px; border-radius: 8px; position: relative; display: grid; place-items: center; color: #fff; font-size: 8px; font-weight: 800; letter-spacing: .5px; box-shadow: inset 0 -3px 0 rgba(0, 0, 0, .18); }
.lb-palette-block:nth-child(1) { background: linear-gradient(135deg, #f43f5e, #be123c); }
.lb-palette-block:nth-child(2) { background: linear-gradient(135deg, #fbbf24, #d97706); }
.lb-palette-block:nth-child(3) { background: linear-gradient(135deg, #34d399, #059669); }
.lb-palette-block:nth-child(4) { background: linear-gradient(135deg, var(--purple-l), var(--blue-l)); }
.lb-palette-block.is-active { outline: 2px solid var(--lime); outline-offset: 2px; }
.lb-workshop-main { padding: 16px 17px 0; min-width: 0; display: grid; grid-template-columns: 1fr 132px; gap: 14px; align-content: start; }
.lb-phone-proof { border: 5px solid #2a2150; border-radius: 18px; overflow: hidden; background: #eff0f5; box-shadow: 0 12px 24px rgba(0, 0, 0, .28); grid-row: 1 / 3; max-width: 280px; justify-self: center; }
.lb-phone-proof img { width: 100%; height: auto; display: block; }
.lb-tool-cards { display: grid; align-content: start; gap: 8px; }
.lb-tool-card { padding: 10px 11px; color: #fff; background: rgba(124, 58, 237, .18); border: 1px solid rgba(167, 139, 250, .35); border-radius: 9px; display: grid; grid-template-columns: 22px 1fr; gap: 8px; align-items: center; }
.lb-tool-card i { color: var(--lime); font-size: 16px; }
.lb-tool-card strong { display: block; font-size: 11px; font-weight: 800; }
.lb-tool-card span { display: block; font-size: 8px; color: #b3a8d6; line-height: 1.3; }
.lb-tool-card.is-hot { background: rgba(217, 232, 74, .16); border-color: rgba(217, 232, 74, .45); }
.lb-tool-card.is-hot i { color: var(--lime); }
.lb-progress-bar { grid-column: 1 / -1; margin-top: 4px; padding: 11px 13px; background: rgba(0, 0, 0, .22); border-radius: 9px; display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 10px; color: #fff; }
.lb-progress-bar small { font-size: 9px; color: #a89dc4; letter-spacing: .5px; }
.lb-progress-track { height: 6px; border-radius: 99px; background: rgba(255, 255, 255, .16); overflow: hidden; }
.lb-progress-fill { display: block; height: 100%; width: 78%; background: var(--grad); border-radius: 99px; }
.lb-progress-bar strong { font-size: 13px; color: var(--lime); font-weight: 800; }
.lb-workshop figcaption { position: absolute; right: 18px; bottom: -27px; color: #9089a8; font-size: 10px; }

/* ===== 3. 创作流程横向3步（紫底全宽） ===== */
.lb-flow-picker { background: var(--grad); color: #fff; padding-inline: max(40px, calc((100vw - 1240px) / 2)); position: relative; overflow: hidden; }
.lb-flow-picker::before { content: ""; position: absolute; inset: 0; pointer-events: none; opacity: .22; background-image: radial-gradient(circle, rgba(255, 255, 255, .4) 1.2px, transparent 1.2px); background-size: 16px 16px; }
.lb-flow-lead { padding: 60px 36px 48px; border-bottom: 1px solid rgba(255, 255, 255, .22); display: grid; gap: 16px; align-content: start; position: relative; z-index: 1; }
.lb-flow-lead > span { font: 700 10px/1 Arial, sans-serif; letter-spacing: 1.7px; opacity: .78; }
.lb-flow-lead h2 { margin: 4px 0 8px; font-size: 36px; line-height: 1.35; max-width: 520px; }
.lb-flow-lead p { margin: 0; max-width: 480px; line-height: 1.8; font-size: 14px; opacity: .85; }
.lb-flow-options { display: grid; grid-template-columns: repeat(3, 1fr); position: relative; z-index: 1; }
.lb-flow-options article { min-width: 0; padding: 56px 28px 50px; border-right: 1px solid rgba(255, 255, 255, .22); position: relative; transition: background .25s; }
.lb-flow-options article:last-child { border: 0; }
.lb-flow-options article:hover { background: rgba(255, 255, 255, .08); }
.lb-flow-options article::before { content: ""; position: absolute; right: -8px; top: 50%; width: 16px; height: 16px; background: var(--lime); border-radius: 50%; transform: translateY(-50%); box-shadow: 0 0 0 4px rgba(217, 232, 74, .25); }
.lb-flow-options article:last-child::before { display: none; }
.lb-flow-num { position: absolute; right: 22px; top: 22px; font: 800 11px/1 Arial, sans-serif; opacity: .65; letter-spacing: 1px; }
.lb-flow-icon { display: grid; place-items: center; width: 56px; height: 56px; border-radius: 16px; background: rgba(255, 255, 255, .16); margin-bottom: 26px; }
.lb-flow-icon i { font-size: 28px; color: var(--lime); }
.lb-flow-options h3 { font-size: 20px; margin: 0 0 14px; }
.lb-flow-options p { margin: 0; font-size: 13px; line-height: 1.75; opacity: .85; }
.lb-flow-tag { display: inline-block; margin-top: 22px; padding: 5px 10px; background: rgba(217, 232, 74, .22); border: 1px solid rgba(217, 232, 74, .5); border-radius: 99px; font-size: 10px; font-weight: 700; color: var(--lime); }

/* ===== 4. 玩法矩阵3列卡片（白底） ===== */
.lb-play-matrix { width: min(1240px, calc(100% - 40px)); margin: 0 auto; padding: 72px 0 64px; position: relative; z-index: 1; }
.lb-play-heading { display: grid; grid-template-columns: 1fr auto; align-items: end; gap: 30px; margin-bottom: 38px; }
.lb-play-heading h2 { margin: 12px 0 0; font-size: 34px; line-height: 1.35; max-width: 640px; }
.lb-play-heading p { margin: 0; color: var(--muted); font-size: 14px; line-height: 1.8; max-width: 320px; }
.lb-play-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.lb-play-card { padding: 28px 24px 24px; background: var(--panel); border: 1px solid var(--line); border-radius: 16px; display: grid; align-content: start; gap: 14px; position: relative; transition: transform .25s, box-shadow .25s, border-color .25s; }
.lb-play-card::before { content: ""; position: absolute; left: 0; top: 0; width: 100%; height: 4px; background: var(--grad); border-radius: 16px 16px 0 0; opacity: 0; transition: opacity .25s; }
.lb-play-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); border-color: rgba(124, 58, 237, .3); }
.lb-play-card:hover::before { opacity: 1; }
.lb-play-card:nth-child(2)::before { background: linear-gradient(135deg, #ec4899, #f43f5e); }
.lb-play-card:nth-child(3)::before { background: linear-gradient(135deg, #fbbf24, #f59e0b); }
.lb-play-icon { display: grid; place-items: center; width: 56px; height: 56px; border-radius: 14px; background: var(--soft); color: var(--purple); }
.lb-play-card:nth-child(2) .lb-play-icon { background: #fce7f3; color: #db2777; }
.lb-play-card:nth-child(3) .lb-play-icon { background: #fef3c7; color: #d97706; }
.lb-play-icon i { font-size: 26px; }
.lb-play-card h3 { margin: 0; font-size: 19px; }
.lb-play-card p { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.75; }
.lb-play-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 4px; padding-top: 14px; border-top: 1px dashed var(--line); }
.lb-play-tags span { padding: 4px 10px; border-radius: 99px; font-size: 10px; font-weight: 700; background: var(--soft); color: var(--purple-d); }
.lb-play-card:nth-child(2) .lb-play-tags span { background: #fce7f3; color: #be185d; }
.lb-play-card:nth-child(3) .lb-play-tags span { background: #fef3c7; color: #b45309; }

/* ===== 5. 社区作品瀑布流（columns:2，6卡，第2/5暗色） ===== */
.lb-works-wall { padding: 68px max(40px, calc((100vw - 1240px) / 2)) 72px; background: var(--soft); position: relative; z-index: 1; }
.lb-works-intro { display: grid; grid-template-columns: 1fr auto; align-items: end; gap: 30px; max-width: 1240px; margin: 0 auto 34px; }
.lb-works-intro h2 { margin: 12px 0 0; font-size: 34px; line-height: 1.35; }
.lb-works-intro p { margin: 0; color: var(--muted); font-size: 14px; line-height: 1.8; max-width: 320px; }
.lb-works-list { columns: 2 320px; column-gap: 18px; max-width: 1240px; margin: 0 auto; }
.lb-work { break-inside: avoid; display: inline-block; width: 100%; margin: 0 0 18px; padding: 14px; background: var(--panel); border: 1px solid var(--line); border-radius: 14px; transition: transform .25s, box-shadow .25s; }
.lb-work:hover { transform: translateY(-3px); box-shadow: var(--shadow); }
.lb-work:nth-child(2), .lb-work:nth-child(5) { background: var(--ink); color: #fff; border-color: var(--ink-2); }
.lb-work-img { border-radius: 9px; overflow: hidden; margin-bottom: 12px; }
.lb-work-img img { width: 100%; height: auto; }
.lb-work-meta { display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 10px; }
.lb-work-avatar { width: 30px; height: 30px; display: grid; place-items: center; border-radius: 50%; color: #fff; background: var(--grad); font-size: 11px; font-weight: 800; }
.lb-work:nth-child(2) .lb-work-avatar, .lb-work:nth-child(5) .lb-work-avatar { background: var(--lime); color: var(--ink); }
.lb-work-name { font-size: 12px; font-weight: 800; }
.lb-work-meta small { font-size: 9px; color: var(--muted); }
.lb-work:nth-child(2) .lb-work-meta small, .lb-work:nth-child(5) .lb-work-meta small { color: #a89dc4; }
.lb-work-likes { display: inline-flex; align-items: center; gap: 4px; font-size: 11px; font-weight: 700; color: #ec4899; }
.lb-work:nth-child(2) .lb-work-likes, .lb-work:nth-child(5) .lb-work-likes { color: var(--lime); }

/* ===== 6. 评分汇总横条 + 评论列表 ===== */
.lb-rating-section { width: min(1120px, calc(100% - 40px)); margin: 0 auto; padding: 68px 0 64px; position: relative; z-index: 1; }
.lb-rating-bar { display: grid; grid-template-columns: auto 1fr auto auto auto; align-items: center; gap: 28px; padding: 26px 30px; background: var(--panel); border: 1px solid var(--line); border-radius: 16px; box-shadow: var(--shadow-sm); margin-bottom: 32px; }
.lb-rating-score { display: grid; gap: 4px; }
.lb-rating-score strong { font-size: 42px; line-height: 1; background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; font-weight: 800; }
.lb-rating-score small { font-size: 10px; color: var(--muted); letter-spacing: .5px; }
.lb-rating-stars { display: flex; gap: 3px; color: #fbbf24; font-size: 18px; }
.lb-rating-stars i { color: #e5e0f5; }
.lb-rating-stars i.is-on { color: #fbbf24; }
.lb-rating-stat { display: grid; gap: 3px; }
.lb-rating-stat strong { font-size: 18px; font-weight: 800; }
.lb-rating-stat small { font-size: 10px; color: var(--muted); }
.lb-review-list { display: grid; gap: 14px; }
.lb-review { display: grid; grid-template-columns: auto 1fr; gap: 16px; padding: 22px 24px; background: var(--panel); border: 1px solid var(--line); border-radius: 14px; transition: border-color .25s, box-shadow .25s; }
.lb-review:hover { border-color: rgba(124, 58, 237, .3); box-shadow: var(--shadow-sm); }
.lb-review-avatar { width: 46px; height: 46px; display: grid; place-items: center; border-radius: 50%; color: #fff; background: var(--grad); font-size: 16px; font-weight: 800; }
.lb-review-head { display: flex; align-items: center; gap: 12px; margin-bottom: 8px; flex-wrap: wrap; }
.lb-review-head strong { font-size: 14px; font-weight: 800; }
.lb-review-head time { font-size: 11px; color: var(--muted); }
.lb-review-stars { color: #fbbf24; font-size: 12px; letter-spacing: 1px; }
.lb-review-stars i { color: #e5e0f5; }
.lb-review p { margin: 0; color: #4a4360; font-size: 13px; line-height: 1.85; }

/* ===== 7. FAQ 左右两栏 ===== */
.lb-faq { width: min(1120px, calc(100% - 40px)); margin: 0 auto; padding: 72px 0 68px; display: grid; grid-template-columns: 320px 1fr; gap: 60px; position: relative; z-index: 1; }
.lb-faq-intro > span { color: var(--purple-d); font: 800 10px/1 Arial, sans-serif; letter-spacing: 1.5px; }
.lb-faq-intro h2 { margin: 18px 0 14px; font-size: 32px; line-height: 1.4; }
.lb-faq-intro p { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.8; }
.lb-faq-contact { margin-top: 26px; padding: 22px 24px; background: var(--grad); border-radius: 14px; color: #fff; display: grid; gap: 10px; }
.lb-faq-contact i { font-size: 22px; color: var(--lime); }
.lb-faq-contact strong { font-size: 16px; }
.lb-faq-contact small { font-size: 12px; opacity: .85; line-height: 1.7; }
.lb-faq-list { border-top: 1px solid var(--ink); }
.lb-faq details { border-bottom: 1px solid var(--line); }
.lb-faq summary { display: grid; grid-template-columns: 42px 1fr auto; align-items: center; gap: 8px; padding: 20px 0; font-size: 14px; font-weight: 800; }
.lb-faq summary span { color: var(--purple); font: 700 10px/1 Arial, sans-serif; list-style: decimal-leading-zero inside; }
.lb-faq summary i { font-size: 19px; color: var(--purple); transition: transform .2s; }
.lb-faq details[open] summary i { transform: rotate(45deg); }
.lb-faq details p { margin: -6px 42px 20px; color: var(--muted); font-size: 12px; line-height: 1.85; }

/* ===== 8. 紫蓝渐变CTA全宽 + 积木装饰圆 ===== */
.lb-final-call { width: min(1240px, calc(100% - 40px)); margin: 0 auto 28px; min-height: 260px; display: grid; grid-template-columns: 1fr auto; gap: 30px; align-items: center; padding: 42px 48px; color: #fff; background: var(--grad); border-radius: 2px 42px 2px 2px; position: relative; overflow: hidden; }
.lb-final-call::before { content: ""; position: absolute; right: -60px; top: -60px; width: 220px; height: 220px; border-radius: 50%; background: rgba(255, 255, 255, .12); }
.lb-final-call::after { content: ""; position: absolute; right: 80px; bottom: -80px; width: 160px; height: 160px; border-radius: 24px; background: rgba(217, 232, 74, .18); transform: rotate(18deg); }
.lb-final-copy { position: relative; z-index: 1; }
.lb-final-kicker { margin: 0 0 8px; font-size: 11px; font-weight: 800; opacity: .75; letter-spacing: 1px; }
.lb-final-copy h2 { margin: 0 0 12px; font-size: 33px; }
.lb-final-desc { margin: 0; max-width: 560px; font-size: 12px; line-height: 1.75; opacity: .8; }
.lb-final-actions { position: relative; z-index: 1; display: grid; gap: 12px; justify-self: end; }
.lb-final-btn { display: inline-flex; align-items: center; gap: 8px; padding: 14px 22px; border-radius: 11px; font-size: 14px; font-weight: 800; transition: transform .2s; }
.lb-final-btn--solid { background: var(--lime); color: var(--ink); box-shadow: 0 10px 22px rgba(217, 232, 74, .35); }
.lb-final-btn--solid:hover { transform: translateY(-2px) rotate(-1deg); }
.lb-final-btn--ghost { background: transparent; color: #fff; border: 1.5px solid rgba(255, 255, 255, .5); }
.lb-final-btn--ghost:hover { background: rgba(255, 255, 255, .12); }

/* ===== 9. 精致footer 3列 + backtop ===== */
.lb-footer { width: min(1240px, calc(100% - 40px)); margin: 0 auto; padding: 36px 0 40px; display: grid; grid-template-columns: 1.5fr 1fr 1fr; gap: 40px; align-items: start; border-top: 1px solid var(--line); position: relative; z-index: 1; }
.lb-footer-brand { display: grid; gap: 12px; }
.lb-footer-brand > span { display: inline-flex; align-items: center; gap: 10px; }
.lb-footer-brand img { width: 36px; height: 36px; border-radius: 10px; }
.lb-footer-brand strong { font-size: 15px; font-weight: 800; }
.lb-footer-brand p { margin: 0; max-width: 380px; color: #7a7390; font-size: 11px; line-height: 1.7; }
.lb-footer-col h4 { margin: 0 0 14px; font-size: 12px; font-weight: 800; color: var(--purple-d); letter-spacing: .5px; }
.lb-footer-col nav { display: grid; gap: 9px; }
.lb-footer-col a { font-size: 12px; color: #6b6480; display: inline-flex; align-items: center; gap: 6px; transition: color .2s; }
.lb-footer-col a:hover { color: var(--purple); }
.lb-footer-col a i { font-size: 13px; color: var(--purple-l); }
.lb-copyright { grid-column: 1 / -1; margin-top: 18px; padding-top: 18px; border-top: 1px solid var(--line); display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; font-size: 11px; color: #8a8298; }
.lb-backtop { position: fixed; right: 22px; bottom: 22px; width: 44px; height: 44px; border: 0; border-radius: 50%; color: #fff; background: var(--grad); box-shadow: 0 8px 20px rgba(124, 58, 237, .3); cursor: pointer; z-index: 25; opacity: 0; visibility: hidden; transform: translateY(8px); transition: .2s; font-size: 20px; }
.lb-backtop.is-visible { opacity: 1; visibility: visible; transform: none; }

/* ===== 精修子组件细节 ===== */
.lb-masthead.is-scrolled { box-shadow: 0 12px 36px rgba(60, 30, 120, .14); }
.lb-brandmark:hover img { transform: rotate(-6deg) scale(1.04); transition: transform .25s; }
.lb-brandmark img { transition: transform .25s; }
.lb-nav a { transition: color .2s; }
.lb-nav a:hover { color: var(--purple-d); }
.lb-hero h1 em { display: inline-block; position: relative; }
.lb-hero h1 em::after { content: ""; position: absolute; left: 0; right: 0; bottom: 4px; height: 10px; background: rgba(124, 58, 237, .18); z-index: -1; border-radius: 4px; }
.lb-solid-action i, .lb-text-action i { transition: transform .2s; }
.lb-solid-action:hover i { transform: translateY(2px); }
.lb-text-action:hover i { transform: translateX(3px); }
.lb-trust-strip li i { transition: transform .2s; }
.lb-trust-strip li:hover i { transform: scale(1.18); }
.lb-workshop::after { content: "BUILD"; position: absolute; left: -16px; top: 38px; padding: 5px 9px; background: var(--lime); color: var(--ink); border-radius: 6px; font: 800 9px/1 Arial, sans-serif; letter-spacing: 1px; box-shadow: var(--shadow-sm); }
.lb-palette-block { transition: transform .2s, outline-offset .2s; }
.lb-palette-block:hover { transform: translateY(-2px); }
.lb-tool-card { transition: transform .2s, background .2s; }
.lb-tool-card:hover { transform: translateX(-3px); background: rgba(167, 139, 250, .26); }
.lb-progress-fill { background-size: 200% 100%; animation: lb-progress-glow 2.4s linear infinite; }
@keyframes lb-progress-glow { 0% { background-position: 0% 0; } 100% { background-position: 200% 0; } }
.lb-progress-fill { background-image: linear-gradient(90deg, var(--purple), var(--blue), var(--purple-l), var(--purple)); }
.lb-flow-icon { position: relative; transition: transform .25s; }
.lb-flow-icon::before { content: ""; position: absolute; inset: -6px; border: 1.5px dashed rgba(255, 255, 255, .35); border-radius: 20px; opacity: 0; transition: opacity .25s; }
.lb-flow-options article:hover .lb-flow-icon { transform: rotate(-8deg) scale(1.05); }
.lb-flow-options article:hover .lb-flow-icon::before { opacity: 1; }
.lb-flow-num { transition: color .25s; }
.lb-flow-options article:hover .lb-flow-num { color: var(--lime); }
.lb-play-card { overflow: hidden; }
.lb-play-card .lb-play-icon { transition: transform .25s, background .25s; }
.lb-play-card:hover .lb-play-icon { transform: rotate(-6deg) scale(1.08); }
.lb-play-card .lb-play-tags span { transition: background .2s, color .2s; }
.lb-play-card:hover .lb-play-tags span { background: var(--soft); }
.lb-work-img { position: relative; }
.lb-work-img img { transition: transform .35s; }
.lb-work:hover .lb-work-img img { transform: scale(1.06); }
.lb-work-img::after { content: ""; position: absolute; left: 8px; top: 8px; padding: 3px 7px; background: rgba(255, 255, 255, .92); color: var(--purple-d); font-size: 9px; font-weight: 800; border-radius: 5px; content: "联机"; }
.lb-work:nth-child(2) .lb-work-img::after, .lb-work:nth-child(5) .lb-work-img::after { background: var(--lime); color: var(--ink); content: "热门"; }
.lb-review-avatar { box-shadow: 0 4px 12px rgba(124, 58, 237, .22); }
.lb-review-head time::before { content: "·"; margin-right: 6px; color: var(--muted); }
.lb-review p { transition: color .2s; }
.lb-review:hover p { color: var(--ink-2); }
.lb-faq-contact { transition: transform .25s; }
.lb-faq-contact:hover { transform: translateY(-2px); }
.lb-faq details[open] summary { color: var(--purple-d); }
.lb-faq summary i { transition: transform .2s, color .2s; }
.lb-final-btn { transition: transform .2s, background .2s; }
.lb-final-call::before, .lb-final-call::after { transition: transform .6s; }
.lb-final-call:hover::before { transform: scale(1.1); }
.lb-final-call:hover::after { transform: rotate(28deg) scale(1.05); }
.lb-footer-col a i { transition: transform .2s; }
.lb-footer-col a:hover i { transform: translateX(3px); }
.lb-backtop { transition: transform .2s, opacity .2s, visibility .2s; }
.lb-backtop:hover { transform: translateY(-3px); }

/* ===== 响应式：1080 / 860 / 640 ===== */
@media (max-width: 1080px) {
  .lb-hero { grid-template-columns: .88fr 1.12fr; gap: 28px; }
  .lb-workshop-main { grid-template-columns: 1fr 116px; }
  .lb-flow-options { grid-template-columns: repeat(2, 1fr); }
  .lb-flow-options article:nth-child(3) { grid-column: 1 / -1; border-right: 0; border-top: 1px solid rgba(255, 255, 255, .22); }
  .lb-flow-options article:nth-child(2) { border-right: 0; }
  .lb-play-grid { grid-template-columns: repeat(2, 1fr); }
  .lb-play-card:nth-child(3) { grid-column: 1 / -1; }
  .lb-faq { grid-template-columns: 280px 1fr; gap: 40px; }
}

@media (max-width: 860px) {
  .lb-masthead { grid-template-columns: auto auto 1fr; gap: 12px; }
  .lb-nav-toggle { display: block; grid-column: 3; justify-self: end; }
  .lb-header-action { grid-column: 2; justify-self: end; }
  .lb-nav { display: none; position: absolute; left: 0; right: 0; top: calc(100% + 8px); padding: 12px; background: #fff; border: 1px solid var(--line); border-radius: 12px; box-shadow: 0 12px 30px rgba(60, 30, 120, .12); flex-direction: column; gap: 0; }
  .lb-nav.is-open { display: flex; }
  .lb-nav a { padding: 12px; border-bottom: 1px solid #f3efff; }
  .lb-hero { grid-template-columns: 1fr; padding-top: 44px; }
  .lb-hero::before { display: none; }
  .lb-workshop { width: min(670px, 100%); justify-self: center; }
  .lb-workshop-chrome { transform: none; }
  .lb-flow-picker { padding-inline: 0; }
  .lb-flow-lead { padding: 48px 8vw 36px; border-bottom: 1px solid rgba(255, 255, 255, .22); }
  .lb-flow-options { grid-template-columns: 1fr; }
  .lb-flow-options article { border-right: 0; border-bottom: 1px solid rgba(255, 255, 255, .22); padding: 40px 8vw; }
  .lb-flow-options article::before { display: none; }
  .lb-play-grid { grid-template-columns: 1fr; }
  .lb-play-card:nth-child(3) { grid-column: auto; }
  .lb-works-list { columns: 1; }
  .lb-rating-bar { grid-template-columns: auto 1fr; gap: 16px; }
  .lb-rating-stat { grid-column: 1 / -1; }
  .lb-faq { grid-template-columns: 1fr; gap: 30px; }
  .lb-final-call { grid-template-columns: 1fr; padding: 32px 28px; }
  .lb-final-actions { justify-self: start; grid-auto-flow: column; }
  .lb-footer { grid-template-columns: 1fr 1fr; }
  .lb-footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 640px) {
  .lb-masthead { width: calc(100% - 24px); height: 66px; margin-top: 10px; padding: 0 10px; }
  .lb-brandmark img { width: 42px; height: 42px; }
  .lb-brandmark strong { font-size: 16px; }
  .lb-brandmark small { display: none; }
  .lb-header-action { padding: 10px 12px; font-size: 0; }
  .lb-header-action::before { content: "下载"; font-size: 12px; }
  .lb-header-action i { font-size: 13px; }
  .lb-hero { width: calc(100% - 28px); padding: 40px 0 44px; gap: 36px; }
  .lb-hero h1 { font-size: 38px; }
  .lb-hero-subtitle { font-size: 19px; }
  .lb-hero-actions { flex-direction: column; align-items: stretch; gap: 12px; }
  .lb-solid-action { justify-content: center; }
  .lb-trust-strip { grid-template-columns: repeat(3, 1fr); display: grid; }
  .lb-trust-strip li { min-width: 0; padding: 0 6px; margin: 0; border: 0; display: grid; justify-items: center; text-align: center; }
  .lb-workshop figcaption { position: static; margin-top: 10px; text-align: center; }
  .lb-workshop-grid { grid-template-columns: 1fr; }
  .lb-palette-nav { grid-auto-flow: column; grid-template-columns: repeat(4, 1fr); padding: 8px; border-right: 0; border-bottom: 1px solid rgba(124, 58, 237, .32); }
  .lb-palette-block { height: 30px; }
  .lb-workshop-main { grid-template-columns: 1fr; }
  .lb-phone-proof { grid-row: auto; }
  .lb-tool-cards { grid-auto-flow: column; grid-template-columns: repeat(3, 1fr); }
  .lb-flow-lead h2 { font-size: 26px; }
  .lb-play-heading { grid-template-columns: 1fr; }
  .lb-play-heading h2 { font-size: 26px; }
  .lb-works-intro { grid-template-columns: 1fr; }
  .lb-works-intro h2 { font-size: 26px; }
  .lb-rating-bar { padding: 20px; grid-template-columns: auto 1fr; }
  .lb-rating-score strong { font-size: 34px; }
  .lb-review { padding: 18px; grid-template-columns: auto 1fr; gap: 12px; }
  .lb-review-avatar { width: 38px; height: 38px; font-size: 14px; }
  .lb-faq { width: calc(100% - 40px); padding: 50px 0 48px; }
  .lb-faq-intro h2 { font-size: 26px; }
  .lb-faq summary { grid-template-columns: 30px 1fr auto; font-size: 13px; }
  .lb-faq details p { margin: -4px 0 18px 38px; }
  .lb-final-call { width: calc(100% - 28px); padding: 28px 22px; border-radius: 2px 28px 2px 2px; }
  .lb-final-copy h2 { font-size: 24px; }
  .lb-footer { width: calc(100% - 40px); grid-template-columns: 1fr; }
  .lb-backtop { right: 14px; bottom: 14px; width: 40px; height: 40px; }
}

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