:root {
  --ly-blue: #0b3d91;
  --ly-blue-2: #2f80ed;
  --ly-bg: #f8fafc;
  --ly-text: #1f2937;
  --ly-muted: #64748b;
  --ly-line: #dbe5f0;
  --ly-white: #ffffff;
  --ly-ink: #0f172a;
  --ly-green: #14b8a6;
  --ly-shadow: 0 20px 55px rgba(15, 23, 42, 0.10);
  --ly-radius: 8px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ly-text); background: var(--ly-bg); font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif; line-height: 1.7; }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; }
.lyai-container { width: min(1180px, calc(100% - 40px)); margin: 0 auto; }
.lyai-skip-link { position: absolute; left: -999px; top: 12px; background: var(--ly-blue); color: #fff; padding: 8px 12px; z-index: 100; }
.lyai-skip-link:focus { left: 12px; }
.lyai-header { position: sticky; top: 0; z-index: 50; background: rgba(255,255,255,.92); backdrop-filter: blur(14px); border-bottom: 1px solid rgba(219,229,240,.8); }
.lyai-header__inner { min-height: 74px; display: flex; align-items: center; gap: 24px; }
.lyai-brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; color: var(--ly-ink); white-space: nowrap; }
.lyai-brand__mark { display: inline-grid; place-items: center; width: 38px; height: 38px; border-radius: 8px; background: linear-gradient(135deg, var(--ly-blue), var(--ly-blue-2)); color: #fff; font-size: 14px; letter-spacing: 0; }
.lyai-brand__text { font-size: 18px; }
.lyai-nav { margin-left: auto; }
.lyai-menu { list-style: none; margin: 0; padding: 0; display: flex; align-items: center; gap: 22px; font-size: 14px; color: #334155; }
.lyai-menu a { display: block; padding: 10px 0; }
.lyai-menu a:hover { color: var(--ly-blue-2); }
.lyai-header-cta, .lyai-btn { display: inline-flex; align-items: center; justify-content: center; min-height: 42px; padding: 0 18px; border-radius: 8px; font-weight: 700; border: 1px solid transparent; transition: transform .18s ease, box-shadow .18s ease, background .18s ease; }
.lyai-header-cta, .lyai-btn--primary { background: var(--ly-blue); color: #fff; box-shadow: 0 12px 28px rgba(11,61,145,.18); }
.lyai-btn--ghost { color: var(--ly-blue); background: #fff; border-color: #c8d7ea; }
.lyai-btn--light { color: var(--ly-blue); background: #fff; }
.lyai-header-cta:hover, .lyai-btn:hover { transform: translateY(-1px); }
.lyai-nav-toggle { display: none; width: 42px; height: 42px; border: 1px solid var(--ly-line); background: #fff; border-radius: 8px; }
.lyai-nav-toggle span { display: block; width: 18px; height: 2px; background: var(--ly-ink); margin: 4px auto; }
.lyai-main { background: var(--ly-bg); }
.lyai-hero { position: relative; overflow: hidden; padding: 88px 0 72px; background: radial-gradient(circle at 80% 18%, rgba(47,128,237,.14), transparent 34%), linear-gradient(180deg, #fff 0%, #f8fafc 100%); }
.lyai-hero__grid { display: grid; grid-template-columns: minmax(0, 1.04fr) minmax(360px, .96fr); gap: 52px; align-items: center; }
.lyai-eyebrow { margin: 0 0 12px; color: var(--ly-blue-2); font-size: 13px; letter-spacing: 0; font-weight: 800; text-transform: uppercase; }
h1, h2, h3 { color: var(--ly-ink); line-height: 1.18; margin: 0; letter-spacing: 0; }
.lyai-hero h1 { font-size: clamp(40px, 5.2vw, 66px); max-width: 760px; }
.lyai-hero p { font-size: 18px; color: #475569; max-width: 720px; }
.lyai-actions { display: flex; gap: 14px; flex-wrap: wrap; margin-top: 28px; }
.lyai-hero__metrics { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 28px; }
.lyai-hero__metrics span { min-width: 130px; padding: 14px 16px; border: 1px solid var(--ly-line); background: rgba(255,255,255,.72); border-radius: var(--ly-radius); color: var(--ly-muted); }
.lyai-hero__metrics strong { display: block; color: var(--ly-blue); font-size: 22px; }
.lyai-hero-visual { position: relative; min-height: 460px; border: 1px solid #d6e4f5; border-radius: 8px; background: linear-gradient(145deg, #ffffff, #eef6ff); box-shadow: var(--ly-shadow); overflow: hidden; }
.lyai-hero-visual::before { content: ""; position: absolute; inset: 42px; border: 1px dashed rgba(11,61,145,.22); border-radius: 50%; }
.lyai-entity-card { position: absolute; left: 50%; top: 50%; width: 260px; transform: translate(-50%, -50%); padding: 26px; border-radius: 8px; background: #fff; border: 1px solid var(--ly-line); box-shadow: 0 18px 42px rgba(15,23,42,.12); }
.lyai-entity-card span { color: var(--ly-blue-2); font-weight: 800; font-size: 13px; }
.lyai-entity-card strong { display: block; margin: 8px 0; color: var(--ly-ink); font-size: 26px; }
.lyai-entity-card p { margin: 0; font-size: 14px; color: var(--ly-muted); }
.lyai-orbit { position: absolute; display: inline-flex; align-items: center; justify-content: center; min-width: 104px; height: 42px; padding: 0 14px; border-radius: 8px; background: var(--ly-blue); color: #fff; font-size: 14px; font-weight: 700; }
.lyai-orbit--one { left: 32px; top: 72px; background: #0b3d91; }
.lyai-orbit--two { right: 38px; top: 104px; background: #2f80ed; }
.lyai-orbit--three { left: 54px; bottom: 94px; background: #14b8a6; }
.lyai-orbit--four { right: 52px; bottom: 64px; background: #1f2937; }
.lyai-section { padding: 78px 0; }
.lyai-section--soft { background: #fff; }
.lyai-section-head { max-width: 790px; margin-bottom: 34px; }
.lyai-section-head h2, .lyai-cta h2, .lyai-split h2 { font-size: clamp(28px, 3.4vw, 44px); }
.lyai-section-head p, .lyai-split p { color: #526173; font-size: 17px; }
.lyai-three, .lyai-card-grid, .lyai-model { display: grid; gap: 18px; }
.lyai-three { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.lyai-card-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.lyai-card-grid--five { grid-template-columns: repeat(5, minmax(0, 1fr)); }
.lyai-three article, .lyai-card, .lyai-model article { background: #fff; border: 1px solid var(--ly-line); border-radius: var(--ly-radius); padding: 24px; }
.lyai-section--soft .lyai-card, .lyai-section--soft .lyai-three article { background: var(--ly-bg); }
.lyai-three span, .lyai-model span { display: inline-block; color: var(--ly-blue-2); font-weight: 800; margin-bottom: 12px; }
.lyai-card__label { margin: 0 0 14px; color: var(--ly-blue-2); font-size: 13px; font-weight: 800; }
.lyai-card h3, .lyai-three h3, .lyai-model h3 { font-size: 21px; margin-bottom: 10px; }
.lyai-card p, .lyai-three p, .lyai-model p { color: var(--ly-muted); margin: 0 0 16px; }
.lyai-text-link { color: var(--ly-blue); font-weight: 800; }
.lyai-model { grid-template-columns: repeat(5, minmax(0, 1fr)); counter-reset: layer; }
.lyai-feature-band { color: #fff; background: linear-gradient(135deg, var(--ly-blue), #082a63); }
.lyai-feature-band h2, .lyai-feature-band p, .lyai-feature-band .lyai-eyebrow { color: #fff; }
.lyai-split { display: grid; grid-template-columns: minmax(0, .95fr) minmax(320px, 1.05fr); gap: 40px; align-items: start; }
.lyai-check-list { display: grid; gap: 12px; }
.lyai-check-list span { position: relative; padding: 15px 16px 15px 44px; background: #fff; color: var(--ly-text); border: 1px solid var(--ly-line); border-radius: var(--ly-radius); font-weight: 700; }
.lyai-feature-band .lyai-check-list span { border-color: rgba(255,255,255,.22); background: rgba(255,255,255,.1); color: #fff; }
.lyai-check-list span::before { content: ""; position: absolute; left: 18px; top: 22px; width: 9px; height: 9px; border-radius: 50%; background: var(--ly-green); }
.lyai-cta { background: linear-gradient(180deg, #fff, #eef6ff); }
.lyai-form { background: #fff; border: 1px solid var(--ly-line); border-radius: var(--ly-radius); padding: 22px; box-shadow: var(--ly-shadow); }
.lyai-form-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.lyai-form label { display: grid; gap: 7px; color: #334155; font-weight: 700; font-size: 14px; margin-bottom: 14px; }
.lyai-form input, .lyai-form textarea { width: 100%; border: 1px solid #cbd5e1; border-radius: 8px; padding: 12px 13px; font: inherit; color: var(--ly-text); background: #fff; }
.lyai-page-hero { padding: 62px 0 56px; background: linear-gradient(135deg, #fff 0%, #edf5ff 100%); border-bottom: 1px solid var(--ly-line); }
.lyai-page-hero h1 { font-size: clamp(34px, 4.6vw, 56px); max-width: 850px; }
.lyai-page-hero p { max-width: 760px; color: #526173; font-size: 17px; }
.lyai-breadcrumb { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 22px; color: #64748b; font-size: 13px; }
.lyai-breadcrumb a { color: var(--ly-blue); }
.lyai-content, .lyai-article { max-width: 840px; }
.lyai-content p, .lyai-article p { color: #475569; }
.lyai-content h2, .lyai-article h2 { margin: 32px 0 12px; font-size: 30px; }
.lyai-article { background: #fff; border: 1px solid var(--ly-line); border-radius: var(--ly-radius); padding: 34px; }
.lyai-case-meta { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; margin-bottom: 28px; }
.lyai-case-meta span { padding: 12px; border: 1px solid var(--ly-line); border-radius: 8px; background: var(--ly-bg); color: var(--ly-muted); }
.lyai-case-meta strong { display: block; color: var(--ly-ink); }
.lyai-footer { background: #081b3a; color: #cbd5e1; padding: 54px 0 26px; }
.lyai-footer__grid { display: grid; grid-template-columns: 1.4fr repeat(3, 1fr); gap: 32px; }
.lyai-footer h2 { color: #fff; font-size: 16px; margin-bottom: 14px; }
.lyai-footer a { display: block; color: #cbd5e1; margin: 8px 0; }
.lyai-brand--footer { color: #fff; margin-bottom: 14px; }
.lyai-footer__bottom { margin-top: 34px; padding-top: 22px; border-top: 1px solid rgba(255,255,255,.12); display: flex; justify-content: space-between; gap: 20px; font-size: 13px; color: #94a3b8; }
.pagination, .nav-links { margin-top: 32px; }
@media (max-width: 1080px) {
  .lyai-card-grid--five, .lyai-model { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .lyai-hero__grid { grid-template-columns: 1fr; }
  .lyai-hero-visual { min-height: 380px; }
}
@media (max-width: 820px) {
  .lyai-header__inner { min-height: 66px; }
  .lyai-nav-toggle { display: block; margin-left: auto; }
  .lyai-nav { display: none; position: absolute; left: 20px; right: 20px; top: 66px; padding: 16px; border: 1px solid var(--ly-line); border-radius: 8px; background: #fff; box-shadow: var(--ly-shadow); }
  .lyai-nav-open .lyai-nav { display: block; }
  .lyai-menu { display: grid; gap: 6px; }
  .lyai-header-cta { display: none; }
  .lyai-hero { padding: 56px 0; }
  .lyai-hero h1 { font-size: 40px; }
  .lyai-three, .lyai-card-grid, .lyai-split, .lyai-footer__grid { grid-template-columns: 1fr; }
  .lyai-form-grid, .lyai-case-meta { grid-template-columns: 1fr; }
  .lyai-section { padding: 56px 0; }
  .lyai-footer__bottom { display: block; }
}
@media (max-width: 560px) {
  .lyai-container { width: min(100% - 28px, 1180px); }
  .lyai-actions { display: grid; }
  .lyai-btn { width: 100%; }
  .lyai-hero h1 { font-size: 34px; }
  .lyai-hero-visual { min-height: 320px; }
  .lyai-orbit { min-width: auto; height: 36px; font-size: 12px; }
  .lyai-entity-card { width: 220px; padding: 20px; }
  .lyai-card-grid--five, .lyai-model { grid-template-columns: 1fr; }
  .lyai-page-hero h1 { font-size: 32px; }
}
.lyai-faq-list { display: grid; gap: 12px; max-width: 900px; }
.lyai-faq-list details { background: #fff; border: 1px solid var(--ly-line); border-radius: 8px; padding: 0; }
.lyai-faq-list summary { cursor: pointer; padding: 18px 20px; color: var(--ly-ink); font-weight: 800; }
.lyai-faq-list details div { padding: 0 20px 18px; color: var(--ly-muted); }
.lyai-form-success { margin-bottom: 14px; padding: 12px 14px; border-radius: 8px; background: #ecfdf5; color: #047857; font-weight: 700; }