:root{--bg:#08080e;--bg2:#111118;--text:#d0d0d8;--muted:#888;--accent:#00ff99;--accent-dim:#00cc88;--border:#1e1e2e;--red:#ef4444;--amber:#f59e0b;--purple:#8b5cf6;--green:#22c55e}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:64px}
body{background:transparent;color:var(--text);font-family:'Inter',system-ui,-apple-system,sans-serif;line-height:1.7}
main,section,article,header,footer,aside,nav,.content-wrap,.hero,.audio-bar{position:relative;z-index:1}
a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}

/* Progress bar */
.progress-bar{position:fixed;top:0;left:0;height:2px;background:var(--accent);z-index:100;width:0;box-shadow:0 0 8px rgba(0,255,153,0.4);pointer-events:none}

/* Topbar */
.topbar{position:sticky;top:0;z-index:10;-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);background:linear-gradient(180deg,rgba(8,8,14,0.95),rgba(8,8,14,0.88));border-bottom:1px solid var(--border)}
.nav-wrap{max-width:960px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:12px 16px}
.brand{font-weight:700;letter-spacing:.04em;color:var(--accent);font-family:ui-monospace,Consolas,Monaco,monospace}
.menu{display:flex;flex-wrap:wrap;gap:14px;align-items:center}
.menu a{color:var(--text);opacity:.9;font-size:13px;text-decoration:none;font-family:ui-monospace,Consolas,Monaco,monospace}
.menu a:hover{color:var(--accent);text-decoration:none}
.menu a.active{color:var(--accent);font-weight:700}

/* Hero */
.hero{background:linear-gradient(180deg,rgba(10,18,16,0.92),rgba(8,8,14,0.88));padding:18px 16px 14px;border-bottom:1px solid var(--border);text-align:center}
.hero-inner{max-width:760px;margin:0 auto}
.hero-badge{display:inline-block;background:rgba(0,255,153,0.1);border:1px solid rgba(0,255,153,0.3);color:var(--accent);font-size:9px;font-weight:700;letter-spacing:2px;text-transform:uppercase;padding:3px 10px;border-radius:20px;margin-bottom:8px;font-family:ui-monospace,Consolas,Monaco,monospace}
.hero h1{font-size:clamp(1.2rem,3vw,1.6rem);font-weight:900;color:#fff;letter-spacing:-1px;margin:4px 0 2px;font-family:ui-monospace,Consolas,Monaco,monospace}
.hero .subtitle{color:#ccc;font-size:13px;margin-bottom:1px}
.hero .meta-line{color:#555;font-size:11px;margin-bottom:6px;font-family:ui-monospace,Consolas,Monaco,monospace}
.stats{display:flex;gap:6px;justify-content:center;flex-wrap:wrap;margin-top:6px}
.stat{background:rgba(17,17,24,0.88);border-radius:6px;padding:6px 12px;border:1px solid var(--border)}
.stat-num{font-size:16px;font-weight:800;color:var(--accent);font-family:ui-monospace,Consolas,Monaco,monospace}
.stat-label{font-size:9px;color:var(--muted);text-transform:uppercase;letter-spacing:.5px}

/* Content layout */
.content-wrap{max-width:960px;margin:0 auto;padding:24px 16px;display:grid;grid-template-columns:210px 1fr;gap:0;position:relative;z-index:1}

/* TOC sidebar */
.toc{position:sticky;top:64px;max-height:calc(100vh - 80px);overflow-y:auto;padding:14px 12px 14px 14px;background:rgba(8,8,14,0.94);border-right:1px solid var(--border);-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px)}
.toc::-webkit-scrollbar{width:6px}.toc::-webkit-scrollbar-track{background:transparent}.toc::-webkit-scrollbar-thumb{background:var(--border);border-radius:3px}
.toc-title{font-size:11px;font-weight:700;color:var(--accent);letter-spacing:1.5px;text-transform:uppercase;margin-bottom:12px;font-family:ui-monospace,Consolas,Monaco,monospace}
.toc a{display:block;color:var(--muted);font-size:11px;text-decoration:none;padding:3px 0 3px 10px;line-height:1.4;border-left:2px solid transparent;transition:color .15s,border-color .15s}
.toc a:hover{color:var(--accent);border-left-color:var(--accent);text-decoration:none}
.toc a.toc-section{color:var(--text);font-weight:700;font-size:12px;margin-top:14px}
.toc-toggle{display:none;background:var(--bg2);border:1px solid var(--border);border-radius:8px;padding:10px 16px;color:var(--accent);font-size:13px;font-weight:700;cursor:pointer;width:100%;text-align:left;font-family:ui-monospace,Consolas,Monaco,monospace;margin-bottom:16px}

/* Main content */
.content{min-width:0;background:rgba(8,8,14,0.88);padding:0 24px;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px)}

/* Section headers */
.section-header{background:linear-gradient(135deg,rgba(10,26,16,0.9),rgba(10,10,26,0.9));border-radius:14px;padding:20px 24px;margin:32px 0 16px;border:1px solid var(--border)}
.section-header:first-child{margin-top:0}
.section-num{font-size:11px;font-weight:700;color:var(--accent);letter-spacing:2px;text-transform:uppercase;font-family:ui-monospace,Consolas,Monaco,monospace}
.section-header h2{font-size:20px;font-weight:800;color:#fff;margin:4px 0;font-family:ui-monospace,Consolas,Monaco,monospace}
.section-header p{font-size:13px;color:var(--muted);line-height:1.6;margin-top:6px}
.section-controls{display:flex;gap:8px;margin-top:10px}
.expand-btn{background:rgba(0,255,153,0.08);border:1px solid rgba(0,255,153,0.2);color:var(--accent);font-size:11px;font-weight:600;padding:4px 10px;border-radius:6px;cursor:pointer;font-family:ui-monospace,Consolas,Monaco,monospace}
.expand-btn:hover{background:rgba(0,255,153,0.15)}

/* Info cards */
.info-card{background:rgba(17,17,24,0.92);border-radius:12px;padding:20px 24px;margin-bottom:16px;border:1px solid var(--border);-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px)}
.info-card h3{font-size:15px;font-weight:800;color:#fff;margin-bottom:10px;font-family:ui-monospace,Consolas,Monaco,monospace}
.info-card p{font-size:13px;color:#bbb;line-height:1.7;margin-bottom:10px}
.info-card p:last-child{margin-bottom:0}
.info-card ul,.info-card ol{font-size:13px;color:#bbb;line-height:1.7;padding-left:20px;margin-bottom:10px}
.info-card li{margin-bottom:6px}
.info-card strong{color:#fff}
.info-card em{color:var(--accent);font-style:normal}

/* Code block */
.code-block{background:rgba(10,10,20,0.92);border:1px solid var(--border);border-radius:8px;padding:16px;font-family:ui-monospace,Consolas,Monaco,monospace;font-size:12px;color:var(--accent);overflow-x:auto;margin:12px 0;line-height:1.6;white-space:pre}

/* Prereq list */
.prereq-item{display:flex;gap:10px;align-items:flex-start;margin-bottom:10px}
.prereq-icon{font-size:18px;flex-shrink:0;margin-top:1px}
.prereq-name{font-weight:700;color:#fff}
.prereq-desc{font-size:12px;color:var(--muted)}

/* Tip cards */
.tip{background:rgba(17,17,24,0.9);border-radius:10px;margin-bottom:6px;border:1px solid var(--border);overflow:hidden;transition:border-color .2s;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px)}
.tip:hover{border-color:rgba(0,255,153,0.15)}
.tip-header{padding:12px 16px;cursor:pointer;display:flex;align-items:flex-start;gap:10px;-webkit-user-select:none;user-select:none}
.tip-header:hover{background:rgba(255,255,255,0.01)}
.tip-num{background:rgba(0,255,153,0.1);color:var(--accent);font-size:12px;font-weight:800;min-width:34px;height:26px;display:flex;align-items:center;justify-content:center;border-radius:5px;flex-shrink:0;font-family:ui-monospace,Consolas,Monaco,monospace}
.tip-title{font-weight:700;font-size:13.5px;color:#f0f0f0;flex:1;line-height:1.4;padding-top:2px}
.tip-new{font-size:9px;font-weight:700;color:var(--accent);background:rgba(0,255,153,0.1);padding:2px 6px;border-radius:4px;text-transform:uppercase;letter-spacing:.5px;flex-shrink:0;margin-top:4px}
.tip-arrow{color:#555;font-size:13px;transition:transform .2s;flex-shrink:0;margin-top:4px}
.tip.open .tip-arrow{transform:rotate(180deg)}
.tip-body{display:none;padding:0 16px 14px 60px}
.tip.open .tip-body{display:block}
.tip-body p{font-size:13px;color:#bbb;line-height:1.7;margin-bottom:8px}
.tip-body p:last-child{margin-bottom:0}

/* Resources */
.resources{background:rgba(17,17,24,0.92);border-radius:14px;padding:24px;margin-top:24px;border:1px solid var(--border);-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px)}
.resources h3{font-size:15px;font-weight:800;color:#fff;margin-bottom:16px;font-family:ui-monospace,Consolas,Monaco,monospace}
.resource-item{margin-bottom:14px}
.resource-item:last-child{margin-bottom:0}
.resource-item h4{font-size:13px;font-weight:700;color:var(--accent);margin-bottom:3px;font-family:ui-monospace,Consolas,Monaco,monospace}
.resource-item p{font-size:12px;color:var(--muted);line-height:1.6}

/* Footer */
.back-link{display:block;text-align:center;margin:24px 0;font-size:12px}
.page-footer{text-align:center;color:#333;font-size:9px;margin-top:12px;padding:0 16px 24px;line-height:1.5;font-family:ui-monospace,Consolas,Monaco,monospace}

/* Audio reader */
.audio-bar{position:fixed;bottom:0;left:0;right:0;z-index:50;background:linear-gradient(180deg,rgba(8,8,14,0.96),rgba(8,8,14,0.99));border-top:1px solid var(--border);padding:10px 16px;display:none;align-items:center;gap:10px;justify-content:center;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}
.audio-bar.visible~#wp-toggle,.audio-bar.visible+aside+script+button{bottom:60px!important}
.audio-bar.visible{display:flex;flex-wrap:wrap}
.audio-bar button{background:rgba(0,255,153,0.1);border:1px solid rgba(0,255,153,0.25);color:var(--accent);font-size:14px;width:34px;height:34px;border-radius:8px;cursor:pointer;display:flex;align-items:center;justify-content:center;flex-shrink:0;transition:background .15s}
.audio-bar button:hover{background:rgba(0,255,153,0.2)}
.audio-bar button.active{background:rgba(0,255,153,0.25);box-shadow:0 0 8px rgba(0,255,153,0.2)}
.audio-bar button:disabled{opacity:0.3;cursor:default}
.audio-now{font-size:11px;color:var(--muted);max-width:260px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-family:ui-monospace,Consolas,Monaco,monospace;flex:1;min-width:80px;text-align:center}
.audio-now strong{color:var(--accent)}
.audio-speed{background:var(--bg2);border:1px solid var(--border);color:var(--accent);font-size:11px;padding:4px 8px;border-radius:6px;cursor:pointer;font-family:ui-monospace,Consolas,Monaco,monospace;font-weight:700;min-width:42px;text-align:center}
.audio-speed:hover{border-color:rgba(0,255,153,0.3)}
.audio-voice{background:var(--bg2);border:1px solid var(--border);color:var(--text);font-size:11px;padding:4px 6px;border-radius:6px;font-family:ui-monospace,Consolas,Monaco,monospace;max-width:120px}
.audio-launch{display:inline-flex;align-items:center;gap:5px;background:rgba(0,255,153,0.08);border:1px solid rgba(0,255,153,0.2);color:var(--accent);font-size:11px;font-weight:600;padding:4px 10px;border-radius:6px;cursor:pointer;font-family:ui-monospace,Consolas,Monaco,monospace;margin-top:6px;transition:background .15s}
.audio-launch:hover{background:rgba(0,255,153,0.15)}
.tip-read{background:none;border:none;color:#555;font-size:14px;cursor:pointer;padding:2px 4px;flex-shrink:0;margin-top:2px;transition:color .15s;line-height:1}
.tip-read:hover{color:var(--accent)}
.tip.reading,.info-card.reading,.section-header.reading{border-color:rgba(0,255,153,0.4);box-shadow:0 0 12px rgba(0,255,153,0.08)}
.tip.reading .tip-num{background:rgba(0,255,153,0.25)}

/* Responsive */
@media(max-width:768px){
  .content-wrap{grid-template-columns:1fr;gap:0}
  .toc{position:static;max-height:none;display:none;margin-bottom:16px;padding-right:0}
  .toc.open{display:block}
  .toc-toggle{display:block}
  .tip-body{padding-left:16px}
  .hero{padding:28px 16px 24px}
  .stats{gap:6px}
  .stat{padding:8px 12px}
  .stat-num{font-size:18px}
  .section-header{padding:16px 18px;margin:24px 0 12px}
}
@media(max-width:480px){
  .menu{gap:10px}
  .menu a{font-size:12px}
  .tip-header{padding:10px 12px;gap:8px}
  .tip-num{min-width:28px;height:22px;font-size:11px}
  .tip-title{font-size:12.5px}
  .info-card{padding:16px}
}