:root{
  --bg:#f7faff;
  --surface:#ffffff;
  --surface2:#f9fbff;
  --soft:#eef5ff;
  --line:#dbe7ff;
  --text:#111827;
  --muted:#64748b;
  --blue:#2563eb;
  --blue2:#1d4ed8;
  --green:#16a34a;
  --orange:#f97316;
  --purple:#7c3aed;
  --warning:#fff7ed;
  --shadow:0 18px 50px rgba(37,99,235,.10);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:Inter,Arial,Helvetica,sans-serif;
  color:var(--text);
  background:
    radial-gradient(circle at 10% 10%, rgba(37,99,235,.06), transparent 28%),
    radial-gradient(circle at 92% 12%, rgba(22,163,74,.06), transparent 30%),
    var(--bg);
  line-height:1.65;
}
a{color:var(--blue2)}
.topbar{
  min-height:78px;
  padding:12px 72px;
  background:rgba(255,255,255,.9);
  backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line);
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:24px;
  position:sticky;
  top:0;
  z-index:20;
}
.brand{
  display:flex;
  align-items:center;
  gap:12px;
  text-decoration:none;
  color:var(--text);
}
.brand-icon{
  width:48px;
  height:58px;
  border-radius:12px;
  background:linear-gradient(135deg,#2563eb,#06b6d4);
  display:grid;
  place-items:center;
  color:#fff;
  font-weight:900;
  box-shadow:0 12px 25px rgba(37,99,235,.22);
}
.brand strong{display:block;font-size:22px;letter-spacing:-.03em}
.brand small{display:block;color:var(--muted);margin-top:-2px}
.nav{display:flex;gap:26px;align-items:center}
.nav a{text-decoration:none;color:#334155;font-weight:800}
.nav a:hover,.nav a.active{color:var(--blue)}
.download-small{
  text-decoration:none;
  background:var(--blue);
  color:#fff;
  padding:12px 18px;
  border-radius:10px;
  font-weight:900;
  box-shadow:0 12px 28px rgba(37,99,235,.22);
}
main{max-width:1560px;margin:0 auto;padding:34px 28px 0}
.hero{
  display:grid;
  grid-template-columns:1.05fr 1.18fr .95fr;
  gap:36px;
  align-items:center;
  padding:18px 0 28px;
}
.eyebrow{
  display:inline-block;
  padding:7px 12px;
  border-radius:999px;
  background:#e0edff;
  color:var(--blue2);
  font-weight:900;
}
.hero h1{
  margin:16px 0 18px;
  font-size:48px;
  line-height:1.1;
  letter-spacing:-.05em;
}
.hero h1 span{color:var(--blue)}
.lead{font-size:18px;color:#475569;max-width:520px}
.trust{display:flex;flex-wrap:wrap;gap:14px;margin-top:28px}
.trust span{font-weight:800;color:#0f5132;background:#ecfdf5;border:1px solid #bbf7d0;border-radius:999px;padding:7px 10px}
.upload-panel,.android-card,.info-card,.browser-card,.preview-card,.feature-grid article,.notice,.faq,.content-card,.toc,.tutorial-card{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:18px;
  box-shadow:var(--shadow);
}
.drop-zone{
  min-height:284px;
  border:2px dashed #c8d7f0;
  border-radius:18px;
  display:flex;
  align-items:center;
  justify-content:center;
  flex-direction:column;
  padding:30px;
  text-align:center;
  transition:.2s ease;
}
.drop-zone.dragover{background:#edf6ff;border-color:var(--blue)}
.jar-badge{
  width:68px;height:82px;border-radius:14px;
  background:linear-gradient(135deg,#2563eb,#1d4ed8);
  color:#fff;font-weight:900;display:grid;place-items:center;
  box-shadow:0 14px 30px rgba(37,99,235,.25);
}
.drop-zone h2{margin:18px 0 0}
.drop-zone p{margin:6px 0;color:var(--muted)}
.drop-zone small{color:var(--muted);margin-top:14px}
.primary-btn{
  cursor:pointer;
  display:inline-block;
  border:none;
  background:linear-gradient(135deg,#2563eb,#1d4ed8);
  color:white;
  padding:13px 22px;
  border-radius:10px;
  font-weight:900;
  text-decoration:none;
  box-shadow:0 12px 25px rgba(37,99,235,.24);
}
.secondary-btn{
  display:inline-block;
  text-decoration:none;
  color:var(--blue2);
  background:#fff;
  border:1px solid #c8d7f0;
  border-radius:10px;
  padding:12px 18px;
  font-weight:900;
}
.primary-btn.full{display:block;text-align:center;margin-top:18px}
.android-card{padding:24px}
.android-head{display:flex;justify-content:space-between;gap:18px;align-items:flex-start}
.android-card h2{margin:0;color:var(--blue2)}
.android-icon{font-size:34px}
.android-card ul{padding-left:18px;color:#334155}
.workspace{
  display:grid;
  grid-template-columns:280px minmax(380px,1fr) minmax(420px,1fr);
  gap:0;
  margin:22px 0 18px;
}
.hidden{display:none!important}
.info-card,.browser-card,.preview-card{border-radius:0;box-shadow:none}
.info-card{border-radius:18px 0 0 18px;padding:20px}
.preview-card{border-radius:0 18px 18px 0}
.info-card h2,.browser-card h2{font-size:18px;margin:0 0 14px}
.info-card dl{display:grid;grid-template-columns:1fr 1.1fr;gap:8px 12px;font-size:14px}
.info-card dt{color:#475569}
.info-card dd{margin:0;font-weight:700;overflow-wrap:anywhere}
.info-card h3{font-size:16px;margin-top:24px}
.outline-btn{
  width:100%;
  background:#fff;
  border:1px solid #c8d7f0;
  border-radius:9px;
  padding:12px;
  margin:6px 0;
  font-weight:800;
  cursor:pointer;
}
.outline-btn:hover{background:var(--soft)}
.panel-head{padding:18px 20px 10px;border-bottom:1px solid var(--line)}
.search{width:100%;padding:12px 14px;border:1px solid var(--line);border-radius:9px;font-size:14px}
.file-tree{height:360px;overflow:auto;padding:10px 18px}
.file-row{display:flex;align-items:center;gap:8px;padding:8px 9px;border-radius:8px;cursor:pointer;font-size:14px}
.file-row:hover{background:var(--soft)}
.file-row.active{background:#e5f0ff;color:var(--blue2);font-weight:800}
.file-icon{width:18px;text-align:center}
.file-path{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.selected-status{padding:0 20px 14px;color:#475569;font-size:14px}
.tabs{display:flex;padding:10px 12px 0;border-bottom:1px solid var(--line)}
.tab{border:none;background:#fff;padding:12px 18px;font-weight:800;cursor:pointer;border-radius:10px 10px 0 0}
.tab.active{background:var(--soft);color:var(--blue2)}
.preview-pane{height:440px;overflow:auto;padding:20px}
.preview-pane pre{white-space:pre-wrap;word-break:break-word;font-family:Consolas,Menlo,monospace;font-size:13px}
.file-actions{display:flex;gap:10px;flex-wrap:wrap;margin:16px 0}
.warning-box{margin-top:16px;padding:14px;border-radius:12px;border:1px solid #facc15;background:#fffbeb}
.feature-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin:30px 0}
.feature-grid article{padding:22px}
.feature-icon{width:58px;height:58px;border-radius:50%;display:grid;place-items:center;background:var(--soft);font-size:28px;margin-bottom:12px}
.feature-grid h3{margin:0 0 6px}
.feature-grid p{margin:0;color:#475569}
.notice{margin:22px 0;padding:22px;background:var(--warning);border-color:#fed7aa}
.notice h2{margin-top:0}
.faq{padding:24px;margin-bottom:34px}
.faq h2{margin-top:0}
details{border-top:1px solid var(--line);padding:14px 0}
summary{font-weight:900;cursor:pointer}
.seo-section{display:grid;grid-template-columns:minmax(0,1fr) 330px;gap:24px;margin:28px 0}
.content-card{padding:30px}
.content-card h2{font-size:30px;letter-spacing:-.03em;margin:0 0 14px}
.content-card h3{margin-top:26px;color:#0f172a}
.content-card p,.content-card li{color:#475569}
.toc{padding:20px;position:sticky;top:98px}
.toc h3{margin-top:0}
.toc a{display:block;text-decoration:none;font-weight:800;padding:7px 0}
.tutorial-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin:24px 0}
.tutorial-card{padding:20px;text-decoration:none;color:var(--text)}
.tutorial-card strong{display:block;color:var(--blue2);font-size:18px;margin-bottom:6px}
.tutorial-card span{color:#475569}
.page-hero{
  padding:56px 0 20px;
}
.page-hero h1{
  font-size:52px;
  line-height:1.08;
  letter-spacing:-.05em;
  margin:0 0 12px;
}
.page-hero p{font-size:19px;color:#475569;max-width:820px}
.article-layout{display:grid;grid-template-columns:minmax(0,1fr) 330px;gap:24px;margin:20px 0 38px}
.article{padding:34px}
.article h2{font-size:30px;margin-top:28px}
.article h2:first-child{margin-top:0}
.article p,.article li{color:#475569}
.callout{
  background:#eff6ff;
  border:1px solid #bfdbfe;
  border-radius:14px;
  padding:18px;
  margin:22px 0;
}
.footer{
  border-top:1px solid var(--line);
  padding:28px 72px;
  display:flex;
  justify-content:space-between;
  gap:20px;
  background:white;
  color:var(--muted);
}
.footer a{margin-left:20px;text-decoration:none;font-weight:800}
@media(max-width:1100px){
  .topbar{padding:12px 18px}.nav{display:none}
  .hero,.seo-section,.article-layout{grid-template-columns:1fr}
  .workspace{grid-template-columns:1fr}
  .info-card,.browser-card,.preview-card{border-radius:18px;margin-bottom:16px;box-shadow:var(--shadow)}
  .feature-grid,.tutorial-grid{grid-template-columns:1fr 1fr}
  .toc{position:static}
}
@media(max-width:640px){
  main{padding:22px 14px}.hero h1,.page-hero h1{font-size:38px}
  .topbar{height:auto;padding:12px 14px;align-items:flex-start;flex-direction:column}
  .download-small{width:100%;text-align:center}
  .feature-grid,.tutorial-grid{grid-template-columns:1fr}
  .footer{padding:24px 18px;display:block}
  .footer a{margin-left:0;margin-right:14px}
}