:root{
  --bg:#0f1020; --bg2:#16182e; --card:#1c1f3a; --card2:#232752;
  --ink:#ecebff; --muted:#a9a6d6; --brand:#7c5cff; --brand2:#ff5ca8;
  --accent:#19e3c0; --line:#2c2f52; --radius:16px;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"PingFang SC","Microsoft YaHei",sans-serif;
  background:radial-gradient(1200px 600px at 70% -10%,#241b4d 0%,transparent 60%),var(--bg);
  color:var(--ink);line-height:1.6;
}
a{color:inherit;text-decoration:none}
.wrap{max-width:1100px;margin:0 auto;padding:0 20px}
/* header */
.site-header{position:sticky;top:0;z-index:30;background:rgba(15,16,32,.85);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.header-inner{display:flex;align-items:center;gap:18px;height:64px}
.logo{font-weight:800;font-size:20px;display:flex;align-items:center;gap:6px}
.logo span{color:var(--brand)}
.main-nav{display:flex;gap:18px;margin-left:10px;flex:1}
.main-nav a{color:var(--muted);font-weight:600;padding:6px 4px}
.main-nav a:hover,.main-nav a.active{color:var(--ink)}
.btn-primary{background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;border:none;padding:10px 18px;border-radius:999px;font-weight:700;cursor:pointer;display:inline-block}
.btn-primary:hover{filter:brightness(1.08)}
.btn-primary.big{padding:14px 30px;font-size:18px}
.btn-ghost{background:transparent;border:1px solid var(--line);color:var(--ink);padding:9px 18px;border-radius:999px;font-weight:600;display:inline-block;margin-top:14px}
.btn-ghost:hover{border-color:var(--brand)}
/* hero */
.hero{padding:70px 0 40px;text-align:center}
.hero h1{font-size:44px;margin:0 0 12px;background:linear-gradient(135deg,#fff,var(--brand2));-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p{color:var(--muted);font-size:18px;max-width:640px;margin:0 auto 24px}
.hero-stats{display:flex;gap:34px;justify-content:center;margin:30px 0}
.hero-stats div{display:flex;flex-direction:column}
.hero-stats b{font-size:30px;color:var(--brand2)}
.hero-stats span{color:var(--muted);font-size:13px}
/* sections */
.section{padding:46px 0}
.section.alt{background:linear-gradient(180deg,transparent,rgba(124,92,255,.05))}
.section h2{font-size:30px;margin:0 0 6px}
.lead{color:var(--muted);margin:0 0 22px}
.crumb{color:var(--muted);font-size:14px;margin-bottom:10px}
.crumb a:hover{color:var(--brand)}
/* grids */
.cat-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:18px}
.cat-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px;transition:.2s}
.cat-card:hover{transform:translateY(-4px);border-color:var(--brand)}
.cat-emoji{font-size:34px}
.cat-card h3{margin:10px 0 6px;font-size:18px}
.cat-card p{color:var(--muted);font-size:13px;margin:0 0 10px}
.cat-count{color:var(--accent);font-size:12px;font-weight:700}
.tool-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:18px}
.tool-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px;transition:.2s}
.tool-card:hover{transform:translateY(-4px);border-color:var(--brand2)}
.tool-emoji{font-size:30px}
.tool-card h3{margin:8px 0 6px}
.tool-card p{color:var(--muted);font-size:13px}
.sheet-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:16px}
.sheet-card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:18px;text-align:center;transition:.2s}
.sheet-card:hover{transform:translateY(-3px);border-color:var(--brand)}
.sheet-emoji{font-size:30px}
.sheet-card h3{margin:8px 0 4px;font-size:15px}
.sheet-card .composer{color:var(--muted);font-size:12px;margin:0 0 8px}
.badge{display:inline-block;background:rgba(124,92,255,.18);color:var(--brand);font-size:11px;padding:2px 10px;border-radius:999px}
.chip-row{display:flex;flex-wrap:wrap;gap:10px}
.chip-row a{padding:8px 16px;border:1px solid var(--line);border-radius:999px;color:var(--muted);font-weight:600}
.chip-row a:hover{color:var(--ink);border-color:var(--brand)}
.blog-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:18px}
.blog-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:20px}
.blog-card h3{margin:0 0 8px;font-size:17px}
.blog-card p{color:var(--muted);font-size:14px;margin:0}
.story p{color:var(--muted);max-width:760px}
/* sheet detail */
.sheet-detail h1{font-size:34px;margin:4px 0}
.sheet-detail .composer{color:var(--muted)}
.sheet-actions{display:flex;gap:12px;flex-wrap:wrap;margin:18px 0}
.note-preview{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:18px}
.notes{font-family:ui-monospace,monospace;color:var(--accent);letter-spacing:2px}
/* static pages */
.static-page{max-width:760px}
.static-page h1{font-size:34px}
.post-body{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:24px}
.post-body h2,.post-body h3{color:var(--brand2)}
.post-body pre{background:#0c0d1c;padding:14px;border-radius:10px;overflow:auto}
.summary{color:var(--muted)}
/* footer */
.site-footer{border-top:1px solid var(--line);margin-top:40px;padding:40px 0 20px;background:var(--bg2)}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:24px}
.footer-grid h4{margin:0 0 10px}
.footer-grid a{display:block;color:var(--muted);padding:3px 0}
.footer-grid a:hover{color:var(--ink)}
.footer-bottom{color:var(--muted);font-size:13px;margin-top:24px;text-align:center}
/* ads */
.ad-top,.ad-bottom{margin:14px 0;text-align:center;min-height:10px}
.ad-top > *, .ad-bottom > *{margin:0 auto}
/* donate */
.donate-fab{position:fixed;right:22px;bottom:22px;z-index:40;width:56px;height:56px;border-radius:50%;border:none;background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;font-size:24px;cursor:pointer;box-shadow:0 8px 24px rgba(124,92,255,.5)}
.modal{position:fixed;inset:0;background:rgba(0,0,0,.6);display:flex;align-items:center;justify-content:center;z-index:50}
.modal.hidden{display:none}
.modal-card{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:30px;max-width:380px;text-align:center;position:relative}
.modal-card h3{margin:0 0 8px}
.modal-card p{color:var(--muted)}
.modal-close{position:absolute;right:12px;top:8px;background:none;border:none;color:var(--muted);font-size:24px;cursor:pointer}
.btn-coffee{display:inline-block;margin-top:14px;background:#ffdd57;color:#3a2b00;font-weight:800;padding:10px 22px;border-radius:999px}
/* tool canvas */
.tool-canvas{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:20px;margin-top:14px}
.tool-page h1{font-size:32px;display:flex;align-items:center;gap:10px}
.hint{color:var(--muted);font-size:13px;font-style:italic}
/* contact form */
.contact-form{display:flex;flex-direction:column;gap:12px;max-width:460px;margin-top:16px}
.contact-form input,.contact-form textarea{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:12px;color:var(--ink);font-size:15px}
.contact-form textarea{min-height:120px}
@media(max-width:720px){.main-nav{display:none}.hero h1{font-size:32px}.footer-grid{grid-template-columns:1fr 1fr}.hero-stats{gap:18px}}
/* ---- tool widgets ---- */
.mp{display:flex;flex-direction:column;gap:10px}
.mpinfo{color:var(--muted);font-size:14px}
.mbtns{display:flex;gap:10px;flex-wrap:wrap}
.mbtns button,.filebtn{background:var(--card2);border:1px solid var(--line);color:var(--ink);padding:9px 16px;border-radius:10px;font-weight:600;cursor:pointer}
.mbtns button.btn-primary{background:linear-gradient(135deg,var(--brand),var(--brand2));border:none;color:#fff}
.kpiano{display:flex;gap:8px;flex-wrap:wrap;margin-top:6px}
.kkey{background:linear-gradient(180deg,#fff,#e7e7f5);color:#16182e;border-radius:10px;width:64px;height:120px;display:flex;flex-direction:column;align-items:center;justify-content:flex-end;padding-bottom:10px;cursor:pointer;user-select:none;box-shadow:0 4px 0 #b9b9d6;font-weight:700}
.kkey span{font-size:13px}.kkey em{font-style:normal;color:#7c5cff;font-size:18px}
.kkey.on{transform:translateY(3px);box-shadow:0 1px 0 #b9b9d6;background:#d9d4ff}
.metro{text-align:center}
.metro .bpm{font-size:40px;font-weight:800;color:var(--brand2)}
.metro input[type=range]{width:70%}
.beats{display:flex;gap:10px;justify-content:center;margin:14px 0}
.bdot{width:26px;height:26px;border-radius:50%;background:var(--card2);border:1px solid var(--line)}
.bdot.on{background:var(--brand2);box-shadow:0 0 14px var(--brand2)}
.metro label{color:var(--muted);font-size:14px}
.filebtn{display:inline-block}