:root{
  --bg0:#070b18;--bg1:#0a0e1f;--bg2:#10182e;--bg3:#141c38;
  --line:#22304f;--line2:#2a3b5e;
  --tx:#eaf2ff;--tx2:#c8d6e5;--tx3:#7a8ba8;
  --neon:#00d9ff;--cyan:#5fd4ff;--purple:#7a5cff;
  --grad:linear-gradient(90deg,#00c9ff,#7a5cff);
  --card:rgba(15,24,48,.72);
  --mono:"Consolas","SF Mono",monospace;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  background:radial-gradient(1200px 600px at 80% -10%,#16224a 0%,transparent 60%),
             radial-gradient(900px 500px at -10% 110%,#0e1a3a 0%,transparent 55%),
             linear-gradient(180deg,#070b18,#0a0e1f 60%,#0d1226);
  color:var(--tx);font-family:"Microsoft YaHei","PingFang SC",-apple-system,sans-serif;
  line-height:1.6;overflow-x:hidden;-webkit-tap-highlight-color:transparent;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;text-rendering:optimizeLegibility;
}
a{color:var(--cyan);text-decoration:none}
:focus-visible{outline:2px solid var(--cyan);outline-offset:2px}
.btn:focus-visible{outline-offset:3px}
.parent-card:focus-visible,.sib-chip:focus-visible{border-radius:14px}
summary:focus-visible{outline-offset:-2px}
.wrap{max-width:1120px;margin:0 auto;padding:0 24px}

/* 顶栏 */
.topbar{position:fixed;top:0;left:0;right:0;z-index:50;background:rgba(7,11,24,.82);
  backdrop-filter:saturate(1.4) blur(10px);border-bottom:1px solid var(--line)}
.topbar-in{display:flex;align-items:center;gap:14px;flex-wrap:wrap;padding:10px 24px}
.crumb{font-size:13px;color:var(--tx3);display:flex;gap:7px;flex-wrap:wrap;align-items:center}
.crumb a{color:var(--tx3)} .crumb a:hover{color:var(--cyan)}
.crumb b{color:var(--tx);font-weight:700} .crumb .sep{color:#3a4a6a}
.seg{margin-left:auto;display:flex;background:rgba(15,24,48,.6);border:1px solid var(--line2);border-radius:999px;padding:3px}
.seg button{border:none;background:transparent;color:var(--tx3);font-size:13px;font-weight:600;
  padding:6px 14px;border-radius:999px;cursor:pointer;transition:.18s;display:flex;align-items:center;gap:5px}
.seg button .dot{width:7px;height:7px;border-radius:50%;background:#3a4a6a;transition:.18s}
.seg button.active{background:var(--grad);color:#05121f;box-shadow:0 4px 14px rgba(0,201,255,.3)}
.seg button.active .dot{background:#05121f}
.progress{position:absolute;left:0;right:0;bottom:0;height:2px;background:var(--grad);width:0;transition:width .1s;z-index:2}

main{height:100vh;overflow-y:auto;scroll-snap-type:y mandatory}
.screen{scroll-snap-align:start;min-height:100vh;display:flex;flex-direction:column;justify-content:center;padding:72px 24px 24px}
.screen[id]{scroll-margin-top:64px}
/* P2/P3 内容页顶部对齐并减少上空（snap 后 screen 顶约 64px，补 24px 即可） */
.screen.intro,.screen.faq{justify-content:flex-start;padding-top:24px}

/* ===== P1：仿 ppt.html 首屏（无选择器，区域已固定；整屏正好一视口） ===== */
.hero{display:grid;grid-template-columns:1.05fr .95fr;gap:14px 40px;align-items:start;padding:0}
.hero h1{font-size:clamp(27px,3.6vw,32px);line-height:1.18;font-weight:800;letter-spacing:.5px}
.hero h1 .hl{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero .sub{margin-top:10px;font-size:14.5px;color:var(--tx2);max-width:520px;line-height:1.55}
.hero .tags{display:flex;gap:8px;margin-top:12px;flex-wrap:wrap}
.hero .tag{padding:5px 12px;border:1px solid var(--line2);border-radius:999px;font-size:12px;line-height:1;white-space:nowrap;display:inline-flex;align-items:center;color:var(--cyan);background:rgba(0,217,255,.05)}
.hero .cta{display:flex;flex-wrap:wrap;gap:12px 14px;margin-top:14px;align-items:center}
.btn{display:inline-flex;align-items:center;gap:8px;padding:11px 24px;border-radius:10px;font-size:15px;font-weight:700;cursor:pointer;border:none;transition:.2s;text-decoration:none}
.btn-primary{background:var(--grad);color:#05121f;box-shadow:0 8px 24px rgba(0,201,255,.28)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 12px 30px rgba(0,201,255,.4)}
.btn-ghost{background:transparent;border:1px solid var(--line2);color:var(--tx2)}
.btn-ghost:hover{border-color:var(--cyan);color:var(--cyan)}
.hero .price-note{font-size:13px;color:var(--tx3);margin-top:8px}
.hero .price-note b{color:var(--tx);font-size:15px}
.hero-visual{position:relative;display:flex;justify-content:flex-end}
.hero-visual .frame{display:inline-flex;flex-direction:column;align-items:center;border:1px solid var(--line2);border-radius:16px;overflow:hidden;background:var(--card);box-shadow:0 20px 60px rgba(0,0,0,.5);position:relative;max-width:100%}
.hero-visual .frame::after{content:"";position:absolute;inset:0;border-radius:16px;pointer-events:none;box-shadow:inset 0 0 60px rgba(0,217,255,.08)}
.hero-visual .frame-media{position:relative;line-height:0}
.hero-visual img{display:block;max-width:100%;max-height:300px;width:auto;height:auto;object-fit:contain}
.hero-visual .float{position:absolute;background:var(--card);border:1px solid var(--line2);border-radius:10px;padding:9px 13px;font-size:12px;color:var(--tx2);backdrop-filter:blur(8px);z-index:2}
.hero-visual .float.f1{top:14px;left:14px}
.hero-visual .float.f2{bottom:14px;right:14px}
.hero-visual .float a{color:var(--cyan);text-decoration:none;font-weight:600}
.hero-visual .float a:hover{color:var(--neon)}
.hero-visual .buybar{display:flex;align-items:center;justify-content:space-between;gap:10px;width:100%;border-top:1px solid var(--line2);border-radius:0 0 14px 14px;background:rgba(15,24,48,.45);padding:10px 14px}
.hero-visual .buybar .bn{font-size:14px;font-weight:700;color:var(--tx)}
.hero-visual .buybar .bp{font-size:12px;color:var(--tx3);margin-top:2px}
.hero-visual .buybar .btn{white-space:nowrap}
.features.hero-feats{grid-column:1 / -1;display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:8px}
.feat{border:1px solid var(--line);border-radius:14px;padding:14px 16px;background:linear-gradient(180deg,rgba(20,28,56,.6),rgba(15,24,48,.4));transition:.25s}
.feat:hover{border-color:var(--line2);transform:translateY(-3px);box-shadow:0 14px 34px rgba(0,0,0,.4)}
.feat .ic{font-size:20px;margin-bottom:8px;display:block}
.feat h2,.feat h3{font-size:15px;margin-bottom:6px;color:var(--tx)}
.feat p{font-size:12.5px;color:var(--tx3);line-height:1.5}

/* ===== P2 介绍（暗色） ===== */
.eyebrow{display:inline-flex;align-items:center;gap:6px;font-size:12px;font-weight:700;letter-spacing:.05em;
  color:var(--cyan);background:rgba(0,217,255,.08);padding:4px 11px;border-radius:999px;margin-bottom:14px}
.intro h2{font-size:26px;font-weight:800;margin-bottom:4px}
.intro .secsub{color:var(--tx3);font-size:15px;margin-bottom:20px}
.intro .card{border:1px solid var(--line);border-radius:16px;background:rgba(15,24,48,.4);padding:24px 26px}
.intro .card p{color:var(--tx2);font-size:15px}
.tiles{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:12px;margin-top:20px}
.tile{background:rgba(10,14,31,.5);border:1px solid var(--line);border-radius:14px;padding:14px;transition:.16s}
.tile:hover{transform:translateY(-2px);border-color:var(--line2);box-shadow:0 10px 24px rgba(0,0,0,.3)}
.tile .tk{font-size:12px;color:var(--tx3);margin-bottom:4px}
.tile .tv{font-size:15px;font-weight:800;color:var(--tx)}
.dl{display:inline-flex;align-items:center;gap:7px;margin-top:18px;font-weight:600;font-size:14px;color:var(--cyan);background:rgba(0,217,255,.08);padding:9px 15px;border-radius:10px}
.dl:hover{text-decoration:none;background:rgba(0,217,255,.16)}

/* ===== P3 FAQ（暗色手风琴） ===== */
.faq h2{font-size:26px;font-weight:800;margin-bottom:4px}
.faq .secsub{color:var(--tx3);font-size:15px;margin-bottom:22px}
.faq .list{display:flex;flex-direction:column;gap:11px}
details{border:1px solid var(--line);border-radius:12px;background:rgba(15,24,48,.35);overflow:hidden}
details[open]{box-shadow:0 10px 24px rgba(0,0,0,.35)}
summary{list-style:none;cursor:pointer;padding:15px 20px;font-weight:600;font-size:15px;display:flex;align-items:center;gap:10px;color:var(--tx);transition:background .16s}
.faq summary:hover{background:rgba(0,217,255,.06)}
summary::-webkit-details-marker{display:none}
summary .qn{display:inline-flex;align-items:center;justify-content:center;width:22px;height:22px;border-radius:6px;
  background:rgba(0,217,255,.12);color:var(--cyan);font-size:12px;font-weight:800;flex-shrink:0}
summary .chev{margin-left:auto;color:var(--tx3);transition:.2s}
details[open] summary .chev{transform:rotate(180deg)}
.ans{padding:0 20px 16px;color:var(--tx3);font-size:14.5px}
.trust{text-align:center;color:var(--tx3);font-size:12.5px;margin-top:26px}
.trust b{color:var(--tx2)}

@media(max-width:860px){
  main{scroll-snap-type:none}
  .screen[id]{scroll-margin-top:0}
  .hero{grid-template-columns:1fr;gap:24px}
  .hero>div:first-child{max-width:520px;margin-left:auto;margin-right:auto}
  .hero .sub{text-align:justify}
  .hero-visual{justify-content:center}
  .features.hero-feats{grid-template-columns:1fr}
  .hero-visual img{max-height:260px}
}
@media(max-width:560px){
  /* 顶栏：仅保留面包屑单行（导航胶囊移动端隐藏，内容连续滚动无需按屏跳转） */
  .topbar-in{padding:6px 12px}
  .seg{display:none}
  .crumb{white-space:nowrap;overflow-x:auto;scrollbar-width:none}
  .crumb::-webkit-scrollbar{display:none}
  /* 顶栏变单行（~37px），内容让位相应收紧 */
  .screen{padding:56px 16px 22px}
  .screen.intro,.screen.faq{padding-top:56px}
  /* 预览浮动角标紧凑化，少遮地图 */
  .hero-visual .float{padding:6px 9px;font-size:11px;border-radius:8px}
  .hero-visual .float.f1{top:10px;left:10px}
  .hero-visual .float.f2{bottom:10px;right:10px}
  /* 内容卡与问答触控内边距 */
  .intro .card{padding:18px}
  .tiles{grid-template-columns:1fr 1fr}
  .hero-visual .buybar{flex-direction:column;align-items:stretch}
  summary{padding:14px 16px}
  .ans{padding:0 16px 14px}
}

/* ===== 上下级区域规整排版 ===== */
.region-links{display:grid;grid-template-columns:1fr minmax(180px,.42fr);gap:16px;margin-top:18px;align-items:start}
.region-links .side-col{display:flex;flex-direction:column;gap:14px;min-width:0}
.region-links .dl-side .dl{margin-top:0;display:flex}
@media(max-width:860px){.region-links{grid-template-columns:1fr}}
.rl-hd{display:flex;align-items:center;justify-content:space-between;margin-bottom:10px;min-height:26px}
.rl-tag{font-size:12px;font-weight:700;color:var(--cyan);background:rgba(0,217,255,.08);padding:4px 11px;border-radius:999px}
.rl-count{font-size:12px;color:var(--tx3)}
.parent-card{display:flex;align-items:center;gap:14px;border:1px solid var(--line);border-radius:14px;background:rgba(10,14,31,.5);padding:14px 16px;transition:.16s}
.parent-card:hover{border-color:var(--line2);background:rgba(15,24,48,.55)}
.rl-name{font-size:15px;font-weight:800;color:var(--tx)}
.rl-meta{font-size:12px;color:var(--tx3);margin-top:2px}
.rl-go{margin-left:auto;font-size:12px;color:var(--cyan);white-space:nowrap}
.siblings-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:10px}
.sib-chip{display:flex;align-items:center;justify-content:center;text-align:center;border:1px solid var(--line);border-radius:10px;background:rgba(10,14,31,.4);padding:9px 6px;font-size:13px;color:var(--tx2);text-decoration:none;transition:.16s}
.sib-chip:hover{border-color:var(--cyan);background:rgba(0,217,255,.08);color:var(--cyan)}
@media(max-width:860px){.region-links{grid-template-columns:1fr}}
@media(max-width:680px){.siblings-grid{grid-template-columns:repeat(3,1fr)}}
@media(max-width:560px){.siblings-grid{grid-template-columns:repeat(2,1fr)}}