:root{font-family:Avenir Next,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif;color:#18211f;background:radial-gradient(circle at top,rgba(241,182,103,.35),transparent 35%),linear-gradient(180deg,#f7f1e3,#efe1c5);font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;line-height:1.5;font-weight:400;--surface: rgba(255, 252, 245, .86);--surface-strong: rgba(255, 248, 234, .96);--border: rgba(79, 58, 31, .14);--text-muted: #5f675f;--accent: #d06b2f;--accent-strong: #9e4424;--success: #256f5a;--shadow: 0 24px 60px rgba(111, 76, 21, .12), 0 8px 24px rgba(76, 43, 16, .08)}*{box-sizing:border-box}body{margin:0;min-width:320px;min-height:100vh}button,input{font:inherit}button{cursor:pointer}#app{min-height:100vh}.app-shell{width:min(1120px,calc(100% - 32px));margin:0 auto;padding:40px 0 72px}.hero{position:relative;overflow:hidden;border:1px solid var(--border);border-radius:32px;background:linear-gradient(135deg,#d67e3aeb,#80441ce0),linear-gradient(135deg,rgba(255,255,255,.1),transparent);box-shadow:var(--shadow)}.hero:after{content:"";position:absolute;inset:auto -8% -35% auto;width:280px;height:280px;border-radius:50%;background:#ffdaa32e;filter:blur(12px)}.hero__content{position:relative;z-index:1;padding:48px;color:#fff8ef}.hero__eyebrow{margin:0 0 12px;letter-spacing:.12em;text-transform:uppercase;font-size:.88rem;opacity:.88}.hero h1{margin:0;font-size:clamp(2rem,4vw,3.5rem);line-height:1.08}.hero__description{max-width:620px;margin:16px 0 0;color:#fff8efe6;font-size:1.05rem}.workspace-panel{display:grid;gap:24px;margin-top:24px;padding:28px;border:1px solid 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li+li{margin-top:10px}.tab-panel{padding:24px;overflow-x:auto}.tab-panel__header{display:flex;justify-content:space-between;gap:16px;align-items:center;margin-bottom:20px}.tab-panel__eyebrow{margin:0 0 6px;color:var(--accent);font-weight:700;letter-spacing:.08em;text-transform:uppercase;font-size:.82rem}.chord-diagram{min-width:220px}.chord-diagram__top,.chord-diagram__strings,.chord-diagram__row{display:grid;grid-template-columns:40px 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