@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');
:root{--bg:#0a0a1a;--surface:rgba(255,255,255,.04);--border:rgba(255,255,255,.08);--primary:#667eea;--accent:#764ba2;--text:#e0e0e0;--muted:#888;--radius:16px}
*{margin:0;padding:0;box-sizing:border-box}
body{font-family:'Inter',sans-serif;background:var(--bg);color:var(--text);line-height:1.7;overflow-x:hidden}
::selection{background:var(--primary);color:#fff}
.cover{min-height:100vh;display:flex;align-items:center;justify-content:center;text-align:center;background:linear-gradient(135deg,#0a0a1a 0%,#1a1a3e 50%,#0a0a1a 100%);position:relative;overflow:hidden;padding:40px 20px}
.cover::before{content:'';position:absolute;width:600px;height:600px;background:radial-gradient(circle,rgba(102,126,234,.15),transparent 70%);top:-100px;right:-100px;border-radius:50%}
.cover::after{content:'';position:absolute;width:400px;height:400px;background:radial-gradient(circle,rgba(118,75,162,.12),transparent 70%);bottom:-50px;left:-50px;border-radius:50%}
.cover-content{position:relative;z-index:1;max-width:700px}
.uni-name{font-size:1em;color:var(--primary);letter-spacing:3px;text-transform:uppercase;font-weight:600;margin-bottom:20px}
.cover h1{font-size:3.2em;font-weight:800;background:linear-gradient(135deg,#667eea,#764ba2,#f093fb);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin-bottom:16px;line-height:1.2}
.cover-meta{color:var(--muted);font-size:.95em;line-height:2}
.cover-meta strong{color:var(--text)}
.divider{width:60px;height:3px;background:linear-gradient(90deg,var(--primary),var(--accent));margin:20px auto;border-radius:2px}
nav.sidebar{position:fixed;top:0;left:0;width:260px;height:100vh;background:rgba(10,10,26,.95);backdrop-filter:blur(20px);border-right:1px solid var(--border);padding:20px 0;z-index:100;overflow-y:auto;transform:translateX(-100%);transition:transform .3s}
nav.sidebar.open{transform:translateX(0)}
.nav-header{padding:15px 20px;border-bottom:1px solid var(--border);margin-bottom:10px}
.nav-header h3{color:var(--primary);font-size:1em}
.nav-link{display:block;padding:10px 20px;color:var(--muted);text-decoration:none;font-size:.9em;transition:all .2s;border-left:3px solid transparent}
.nav-link:hover,.nav-link.active{color:#fff;background:rgba(102,126,234,.1);border-left-color:var(--primary)}
.nav-link span{margin-right:8px}
.menu-btn{position:fixed;top:20px;left:20px;z-index:200;width:44px;height:44px;border-radius:12px;background:rgba(102,126,234,.2);border:1px solid var(--border);color:#fff;font-size:1.3em;cursor:pointer;display:none;align-items:center;justify-content:center;backdrop-filter:blur(10px)}
.main{max-width:900px;margin:0 auto;padding:40px 20px}
.lab-section{margin-bottom:60px;scroll-margin-top:80px}
.lab-header{display:flex;align-items:center;gap:16px;margin-bottom:20px}
.lab-num{width:50px;height:50px;border-radius:14px;background:linear-gradient(135deg,var(--primary),var(--accent));display:flex;align-items:center;justify-content:center;font-weight:800;font-size:1.2em;color:#fff;flex-shrink:0}
.lab-header h2{font-size:1.4em;color:#fff}
.lab-header p{color:var(--muted);font-size:.85em}
.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:24px;margin-bottom:16px}
.card h3{color:var(--primary);font-size:1em;margin-bottom:12px;font-weight:600}
.card p{color:var(--muted);font-size:.92em}
pre{background:rgba(0,0,0,.4);border:1px solid var(--border);border-radius:12px;padding:20px;overflow-x:auto;font-size:.82em;line-height:1.6;color:#c8d6e5;margin:10px 0}
pre code{font-family:'Fira Code','Courier New',monospace}
.btn-demo{display:inline-block;padding:12px 28px;background:linear-gradient(135deg,var(--primary),var(--accent));color:#fff;text-decoration:none;border-radius:10px;font-weight:600;font-size:.95em;transition:all .3s;margin-top:10px}
.btn-demo:hover{transform:translateY(-2px);box-shadow:0 8px 25px rgba(102,126,234,.3)}
.footer{text-align:center;padding:40px 20px;border-top:1px solid var(--border);color:var(--muted);font-size:.85em;margin-top:60px}
@media(min-width:1024px){.menu-btn{display:flex}nav.sidebar{transform:translateX(-100%)}}
@media(max-width:768px){.cover h1{font-size:2em}.main{padding:20px 15px}pre{font-size:.75em;padding:14px}}