/* Framework Library — Shared Styles
   Used by: framework.html (index), paper index pages, chapter pages
   Dark theme default, light theme via html.light class
*/
*{margin:0;padding:0;box-sizing:border-box}
:root{
  --bg:#0a0a0f;--surface:rgba(255,255,255,0.03);--surface-hover:rgba(255,255,255,0.06);
  --border:rgba(255,255,255,0.08);--text:#e0e0e6;--text-dim:#9a9aaa;--text-faint:#7c7c87;
  --purple:#a78bfa;--blue:#38bdf8;--green:#22c55e;--orange:#f97316;--red:#ef4444;
  --mono:'JetBrains Mono','SF Mono',Consolas,monospace;
}
html.light{
  --bg:#ffffff;--surface:rgba(0,0,0,0.02);--surface-hover:rgba(0,0,0,0.05);
  --border:rgba(0,0,0,0.1);--text:#1a1a2e;--text-dim:#4a4a5a;--text-faint:#7a7a8a;
  --purple:#7c3aed;--blue:#0284c7;--green:#16a34a;--orange:#ea580c;
}
html{font-size:16px;scroll-behavior:smooth}
[id]{scroll-margin-top:3.5rem}
body{font-family:'Space Grotesk',system-ui,sans-serif;background:var(--bg);color:var(--text);min-height:100vh;line-height:1.6}

/* Header */
.site-header{position:sticky;top:0;z-index:100;display:flex;align-items:center;gap:1rem;padding:0.5rem 1.5rem;background:rgba(10,10,15,0.9);backdrop-filter:blur(12px);border-bottom:1px solid var(--border);width:100%}
html.light .site-header{background:rgba(255,255,255,0.9)}
.header-logo img{display:block;border-radius:3px;opacity:0.85;transition:opacity 0.2s}
.header-logo img:hover{opacity:1}
.header-nav{display:flex;gap:0.3rem;flex:1;flex-wrap:wrap}
.header-nav a{font-size:0.72rem;letter-spacing:0.05em;color:var(--text-dim);text-decoration:none;padding:0.3rem 0.6rem;border-radius:4px;transition:all 0.2s;text-transform:uppercase}
.header-nav a:hover,.header-nav a.active{color:var(--text);background:var(--surface-hover)}
.header-nav a.active{color:var(--purple)}
.nav-dropdown{position:relative}
.nav-dropdown-menu{display:none;position:absolute;top:100%;left:0;min-width:220px;background:rgba(10,10,15,0.97);backdrop-filter:blur(12px);border:1px solid var(--border);border-radius:6px;padding:0.3rem 0;margin-top:0.2rem;box-shadow:0 8px 24px rgba(0,0,0,0.5);z-index:200}
html.light .nav-dropdown-menu{background:rgba(255,255,255,0.97)}
.nav-dropdown:hover .nav-dropdown-menu{display:block}
.nav-dropdown-menu a{display:block;padding:0.4rem 1rem;font-size:0.72rem;border-radius:0;text-transform:none}
.theme-toggle,.lang-selector{background:transparent;border:1px solid var(--border);border-radius:4px;padding:0.25rem 0.5rem;font-size:0.72rem;color:var(--text-dim);cursor:pointer;font-family:inherit}
.theme-toggle:hover,.lang-selector:hover{border-color:rgba(128,128,128,0.3);color:var(--text)}

/* Container */
.container{max-width:900px;margin:0 auto;padding:1.5rem}

/* Chapter navigation */
.chapter-nav{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:0.5rem;margin:1.5rem 0;padding:0.8rem 0;border-top:1px solid var(--border);border-bottom:1px solid var(--border);font-size:0.78rem}
.chapter-nav a{color:var(--blue);text-decoration:none;padding:0.3rem 0.7rem;border:1px solid var(--border);border-radius:5px;transition:all 0.2s}
.chapter-nav a:hover{background:var(--surface-hover);border-color:rgba(128,128,128,0.3)}
.chapter-nav .current{color:var(--text-faint);font-size:0.7rem}

/* Voice toggle */
.voice-toggle{display:flex;margin:1.5rem 0;border:1px solid var(--border);border-radius:6px;width:fit-content;overflow:hidden}
.voice-btn{padding:0.5rem 1.3rem;background:transparent;color:var(--text-dim);border:none;cursor:pointer;font-weight:500;font-size:0.78rem;font-family:inherit;transition:all 0.2s}
.voice-btn.active{background:var(--purple);color:#0a0a0f}
.voice-btn:hover:not(.active){background:var(--surface-hover)}
.voice-content{display:none}
.voice-content.active{display:block}

/* Paper ToC */
.paper-toc{background:var(--surface);padding:1rem 1.2rem;border-radius:8px;margin:1.5rem 0;border:1px solid var(--border)}
.paper-toc summary{cursor:pointer;font-weight:500;font-size:0.85rem;color:var(--text)}
.paper-toc nav{padding:0.5rem 0 0 1rem;border-left:2px solid var(--purple);margin-left:0.5rem;font-size:0.8rem;line-height:2}
.paper-toc a{color:var(--text-dim);text-decoration:none}
.paper-toc a:hover{color:var(--text)}

/* Chapter body content */
.chapter-body{line-height:1.85;font-size:0.94rem}
.chapter-body h2{font-size:1.35rem;font-weight:500;color:var(--text);margin:2.5rem 0 1.2rem;padding-bottom:0.5rem;border-bottom:1px solid var(--border)}
.chapter-body h3{font-size:1.05rem;font-weight:500;color:var(--text);margin:2rem 0 0.8rem}
.chapter-body h4{font-size:0.88rem;font-weight:500;color:var(--text-dim);margin:1.5rem 0 0.6rem}
.chapter-body p{margin:0.9rem 0;color:var(--text-dim)}
.chapter-body blockquote{border-left:3px solid var(--purple);margin:1.5rem 0;padding:1rem 1.5rem;background:var(--surface);border-radius:0 8px 8px 0;font-style:italic;color:var(--text-dim)}
.chapter-body code{font-family:var(--mono);font-size:0.85em;background:var(--surface);padding:0.15rem 0.4rem;border-radius:3px;color:var(--blue)}
.chapter-body .equation{display:block;text-align:center;margin:2rem 0;padding:1.5rem;background:rgba(0,0,0,0.2);border:1px solid var(--border);border-radius:8px;font-family:var(--mono);font-size:0.88rem;color:var(--text);overflow-x:auto}
html.light .chapter-body .equation{background:rgba(0,0,0,0.03)}
.chapter-body ul,.chapter-body ol{margin:0.8rem 0;padding-left:1.5rem;color:var(--text-dim)}
.chapter-body li{margin:0.4rem 0;line-height:1.6}

/* Chapter list (paper index) */
.chapter-list{list-style:none;padding:0}
.chapter-list li{border-bottom:1px solid var(--border)}
.chapter-list a{display:flex;justify-content:space-between;align-items:center;padding:1rem 0.5rem;color:var(--text);text-decoration:none;transition:background 0.2s}
.chapter-list a:hover{background:var(--surface-hover)}
.chapter-list .ch-num{font-family:var(--mono);font-size:0.75rem;color:var(--purple);min-width:3rem}
.chapter-list .ch-title{flex:1;font-size:0.88rem}
.chapter-list .ch-status{font-size:0.6rem;letter-spacing:0.1em;text-transform:uppercase;padding:0.2rem 0.5rem;border-radius:9999px;font-weight:500}
.ch-status-ready{background:rgba(34,197,94,0.12);color:var(--green);border:1px solid rgba(34,197,94,0.25)}
.ch-status-draft{background:rgba(113,113,122,0.1);color:var(--text-faint);border:1px solid var(--border)}

/* Web extras */
.web-extra{margin:1.5rem 0;padding:1.5rem;background:var(--surface);border:1px solid var(--border);border-radius:8px;border-left:3px solid var(--orange)}

/* Paper metadata */
.paper-meta{font-size:0.78rem;color:var(--text-faint);line-height:1.7;margin:1rem 0 2rem;padding:1rem 1.2rem;background:var(--surface);border:1px solid var(--border);border-radius:8px}
.paper-meta strong{color:var(--text-dim)}
.paper-meta a{color:var(--blue);text-decoration:none}

/* Footer */
.footer{margin-top:3rem;padding:1.5rem 0;border-top:1px solid var(--border);text-align:center;font-size:0.75rem;color:var(--text-faint)}
.footer a{color:var(--text-dim);text-decoration:none;margin:0 0.5rem}

/* Responsive */
@media(max-width:600px){.header-nav a{font-size:0.65rem;padding:0.25rem 0.4rem}.site-header{padding:0.4rem 0.8rem;gap:0.5rem}.container{padding:1rem}}
@media print{.site-header,.voice-toggle,.chapter-nav,.theme-toggle,.lang-selector,.web-extra{display:none}.chapter-body{color:#000}.chapter-body h2,.chapter-body h3{color:#000;border-color:#ccc}body{background:#fff;color:#000}}