:root{--bg: #fbfaf7;--surface: #ffffff;--surface-2: #f4f1ec;--ink: #2a2530;--ink-soft: #5b5563;--muted: #938a98;--line: #ece7df;--accent: #e0526a;--accent-soft: #fde7eb;--indigo: #6c5ce7;--easy: #2fa37a;--medium: #d9912f;--hard: #e0526a;--radius: 16px;--radius-sm: 10px;--shadow: 0 1px 2px rgba(42, 37, 48, .04), 0 8px 24px rgba(42, 37, 48, .06);--shadow-hover: 0 2px 4px rgba(42, 37, 48, .06), 0 16px 40px rgba(42, 37, 48, .1);--maxw: 1080px;font-synthesis-weight:none;text-rendering:optimizeLegibility}*{box-sizing:border-box}html,body{margin:0;padding:0;background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,Roboto,Helvetica,Arial,sans-serif;line-height:1.65;font-size:16px;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}img{max-width:100%;display:block}.container{max-width:var(--maxw);margin:0 auto;padding:0 24px}.site-header{position:sticky;top:0;z-index:20;background:#fbfaf7d9;backdrop-filter:saturate(180%) blur(12px);border-bottom:1px solid var(--line)}.site-header .inner{max-width:var(--maxw);margin:0 auto;padding:14px 24px;display:flex;align-items:baseline;gap:14px}.brand{font-weight:800;font-size:1.15rem;letter-spacing:-.01em}.brand .dot{color:var(--accent)}.tagline{color:var(--muted);font-size:.86rem}.site-footer{margin-top:80px;padding:28px 24px 48px;text-align:center;color:var(--muted);font-size:.85rem;border-top:1px solid var(--line)}.hero{padding:56px 0 32px}.hero h1{font-size:clamp(2rem,5vw,2.9rem);line-height:1.12;letter-spacing:-.02em;margin:0 0 14px;font-weight:820}.hero h1 .hl{background:linear-gradient(120deg,var(--accent),#f08a5b);-webkit-background-clip:text;background-clip:text;color:transparent}.hero p{color:var(--ink-soft);font-size:1.08rem;max-width:56ch;margin:0}.stats{display:flex;gap:28px;margin-top:26px;flex-wrap:wrap}.stat .num{font-size:1.7rem;font-weight:820;letter-spacing:-.02em}.stat .label{color:var(--muted);font-size:.82rem}.section-head{display:flex;align-items:center;gap:10px;margin:8px 0 22px}.section-head h2{font-size:1.2rem;margin:0;font-weight:760}.section-head .rule{flex:1;height:1px;background:var(--line)}.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:22px;padding-bottom:24px}.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:transform .18s ease,box-shadow .18s ease,border-color .18s ease;display:flex;flex-direction:column}.card:hover{transform:translateY(-3px);box-shadow:var(--shadow-hover);border-color:#ddd6cb}.card-cover{aspect-ratio:16 / 10;position:relative;background:linear-gradient(135deg,var(--accent),#f08a5b 60%,#f4c95d);display:grid;place-items:center;color:#ffffffeb}.card-cover .note{font-size:2.6rem;filter:drop-shadow(0 2px 6px rgba(0,0,0,.15))}.card-cover img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}.diff-badge{position:absolute;top:10px;right:10px;background:#00000073;color:#fff;font-size:.72rem;font-weight:600;padding:3px 9px;border-radius:999px;backdrop-filter:blur(4px)}.card-body{padding:16px 18px 18px;display:flex;flex-direction:column;gap:8px;flex:1}.card-title{font-size:1.16rem;font-weight:760;letter-spacing:-.01em;line-height:1.3}.card-artist{color:var(--ink-soft);font-size:.95rem}.card-meta{margin-top:auto;display:flex;align-items:center;justify-content:space-between;gap:10px;padding-top:10px;color:var(--muted);font-size:.82rem}.chips{display:flex;flex-wrap:wrap;gap:6px}.chip{font-size:.76rem;color:var(--ink-soft);background:var(--surface-2);padding:3px 9px;border-radius:999px}.avatar{width:24px;height:24px;border-radius:50%;display:inline-grid;place-items:center;color:#fff;font-size:.74rem;font-weight:700;flex-shrink:0}.shared{display:inline-flex;align-items:center;gap:7px}.song-head{padding:48px 0 8px;display:grid;grid-template-columns:240px 1fr;gap:32px;align-items:center}.song-cover{width:240px;height:240px;border-radius:20px;overflow:hidden;box-shadow:var(--shadow);background:linear-gradient(135deg,var(--accent),#f08a5b 60%,#f4c95d);display:grid;place-items:center;color:#ffffffe6;font-size:4rem}.song-cover img{width:100%;height:100%;object-fit:cover}.song-titles h1{margin:0 0 6px;font-size:clamp(1.9rem,4vw,2.6rem);letter-spacing:-.02em;font-weight:820}.song-titles .artist{color:var(--ink-soft);font-size:1.2rem}.song-meta{display:flex;flex-wrap:wrap;align-items:center;gap:16px;margin-top:18px;color:var(--ink-soft);font-size:.95rem}.pill{display:inline-flex;align-items:center;gap:7px;background:var(--surface-2);padding:5px 12px;border-radius:999px;font-size:.86rem}.listen{margin:28px 0 8px}.listen-iframe{position:relative;width:100%;aspect-ratio:16 / 9;border-radius:var(--radius);overflow:hidden;border:1px solid var(--line);background:#000}.listen-iframe iframe{position:absolute;inset:0;width:100%;height:100%;border:0}.listen-link{display:inline-flex;align-items:center;gap:8px;background:var(--accent);color:#fff;padding:10px 18px;border-radius:999px;font-weight:600;box-shadow:0 6px 16px #e0526a52;transition:transform .15s ease}.listen-link:hover{transform:translateY(-2px)}.listen-hint{display:inline-block;margin-top:10px;font-size:.85rem;color:var(--muted)}.listen-hint:hover{color:var(--accent)}.song-body{padding:16px 0 40px;max-width:760px}.song-body h2{font-size:1.32rem;margin:42px 0 14px;font-weight:760;letter-spacing:-.01em;padding-bottom:8px;border-bottom:2px solid var(--accent-soft);display:inline-block}.song-body h2:first-child{margin-top:8px}.song-body h3{font-size:1.05rem;margin:22px 0 8px}.song-body p{margin:0 0 14px;color:var(--ink)}.song-body ul,.song-body ol{padding-left:1.3em;margin:0 0 16px}.song-body li{margin-bottom:8px}.song-body strong{font-weight:720;color:var(--ink)}.song-body em{color:var(--accent);font-style:normal;background:var(--accent-soft);padding:0 4px;border-radius:4px}.song-body blockquote{margin:0 0 16px;padding:10px 16px;border-left:3px solid var(--accent);background:var(--surface-2);border-radius:0 8px 8px 0;color:var(--ink-soft)}.song-body code{font-family:SF Mono,ui-monospace,Menlo,monospace;background:var(--surface-2);padding:1px 6px;border-radius:5px;font-size:.88em}.song-body hr{border:0;border-top:1px solid var(--line);margin:28px 0}.back-link{display:inline-flex;align-items:center;gap:6px;color:var(--muted);font-size:.9rem;margin-top:28px}.back-link:hover{color:var(--accent)}@media(max-width:720px){.song-head{grid-template-columns:1fr;gap:18px;padding-top:28px}.song-cover{width:180px;height:180px;font-size:3rem}.hero{padding:36px 0 20px}.container{padding:0 18px}}.empty{text-align:center;color:var(--muted);padding:60px 0}