:root{color-scheme:dark}*{box-sizing:border-box}body{margin:0;background:#0a111d;color:#eef4ff;font-family:'DM Sans',Arial,sans-serif;line-height:1.6}a{color:#8db6ff}h1,h2,h3{font-family:'Space Grotesk',Arial,sans-serif;line-height:1.15}.site-header{max-width:1150px;margin:auto;padding:22px 24px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid #26354a}.brand{display:flex;align-items:center;gap:10px;text-decoration:none;font-weight:700;color:#eef4ff}.brand-mark{display:grid;place-items:center;width:34px;height:34px;border-radius:10px;background:linear-gradient(135deg,#4f8cff,#4fe0b0);color:#071321;font-weight:800}.site-header nav{display:flex;gap:18px}.site-header nav a{color:#aebdd1;text-decoration:none}main{max-width:1150px;margin:auto;padding:0 24px}.hero{display:grid;grid-template-columns:1fr 1fr;gap:30px;align-items:center;padding:65px 0}.hero h1{font-size:clamp(2.5rem,6vw,4.5rem);letter-spacing:-.05em}.hero h1 span{color:#73a8ff}.hero-text,.section-heading p,.roadmap-copy p,.privacy-note p{color:#aebdd1;line-height:1.7}.eyebrow{color:#69d8bb;font-size:.76rem;font-weight:800;letter-spacing:.14em}.primary-button{display:inline-block;padding:12px 16px;background:#4f8cff;color:#071321;text-decoration:none;border-radius:10px;font-weight:800}.hero-art{min-height:240px;display:grid;place-items:center;position:relative}.orbit{position:absolute;width:250px;height:250px;border:1px solid #293b52;border-radius:50%;transform:scaleY(.5)}.orbit-two{width:320px}.planet{width:130px;height:130px;border-radius:50%;background:radial-gradient(circle at 30% 25%,#75e3d0,#3475d9 55%,#18234a);box-shadow:0 0 60px #3475d955}.float-card{position:absolute;padding:12px;background:#111d2e;border:1px solid #293b52;border-radius:10px}.card-top{top:12px;right:0}.card-bottom{bottom:12px;left:0}.float-card small,.roadmap-item small{display:block;color:#91a5bf}.stats,.card-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}.stats{padding:20px 0 45px}.stats>div,.library-card,.roadmap-item,.topic-card,.subnet-panel,.quiz-form fieldset{padding:18px;background:#111d2e;border:1px solid #293b52;border-radius:13px}.stat-number,.stat-label{display:block}.stat-number{font-size:1.5rem;color:#75e3d0;font-weight:800}.stat-label{font-size:.85rem;color:#aebdd1}.section,.roadmap-section,.study-section{padding:35px 0 55px;border-bottom:1px solid #26354a;scroll-margin-top:70px}.section-heading h2,.roadmap-copy h2{font-size:clamp(2rem,4vw,3rem)}.library-tools{display:flex;justify-content:space-between;gap:15px;margin:25px 0 18px}.search-box{display:flex;gap:8px;align-items:center;padding:0 12px;background:#111d2e;border:1px solid #293b52;border-radius:10px}.search-box input{padding:12px 0;background:transparent;border:0;color:#eef4ff;outline:0}.card-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.library-card[hidden]{display:none}.card-topline{display:flex;justify-content:space-between}.card-tag,.card-kicker{color:#75e3d0;font-size:.75rem;letter-spacing:.1em}.library-card p,.topic-card p{color:#aebdd1;line-height:1.6}.card-link{color:#8db6ff;text-decoration:none;font-weight:700}.card-bottomline{display:flex;gap:7px;flex-wrap:wrap;margin-top:15px}.card-bottomline span{font-size:.75rem;background:#0b1523;padding:5px 8px;border-radius:7px;color:#aebdd1}.roadmap-section{display:grid;grid-template-columns:1fr 1fr;gap:30px}.roadmap-list,.osi-stack,.command-list,.quiz-form{display:grid;gap:10px}.roadmap-item{display:flex;align-items:center;gap:12px}.roadmap-item em{margin-left:auto;font-size:.75rem;color:#91a5bf;font-style:normal}.privacy-note{display:flex;gap:15px;padding:18px;margin:0 0 40px;background:#0e1b2a;border:1px solid #293b52;border-radius:12px}.privacy-note p{margin-bottom:0}footer{display:flex;justify-content:space-between;gap:15px;padding:22px 24px;border-top:1px solid #26354a;color:#91a5bf;font-size:.85rem}footer a{color:#aebdd1;text-decoration:none}.empty-state{color:#aebdd1}.study-main{max-width:1050px;margin:auto;padding:30px 24px 70px}.study-hero{padding:52px 0 32px}.study-hero h1{font-size:clamp(2.4rem,6vw,4rem);letter-spacing:-.05em}.hero-copy{font-size:1.1rem;color:#aebdd1;line-height:1.7}.tag-row,.study-nav{display:flex;gap:10px;flex-wrap:wrap}.tag-row span{font-size:.8rem;padding:7px 11px;border:1px solid #2b4058;border-radius:999px;color:#bdcce0}.study-nav{position:sticky;top:0;background:rgba(10,17,29,.96);padding:12px 0;border-bottom:1px solid #26354a}.study-nav a{font-size:.88rem;color:#c9d7ea;text-decoration:none;padding:8px}.topic-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}.osi-layer,.command-row{display:flex;align-items:center;gap:14px;padding:13px 16px;border:1px solid #2a4059;border-radius:11px;background:#111d2e}.osi-layer>b{display:grid;place-items:center;width:36px;height:36px;border-radius:9px;background:#1d3551;color:#7de2ca}.osi-layer strong,.osi-layer small{display:block}.osi-layer small,.command-row small{margin-top:3px;color:#9fb0c7;line-height:1.4}.callout{margin:18px 0 0;padding:16px 18px;border-left:3px solid #54d6b2;background:#102333;color:#c6d6e8;line-height:1.7;border-radius:0 10px 10px 0}.subnet-facts{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.subnet-facts>div{padding:12px;background:#0b1523;border-radius:10px}.subnet-facts small,.subnet-facts strong{display:block;overflow-wrap:anywhere}.subnet-facts small{color:#94a8c2}ol,.check-list{line-height:1.85;color:#b9c8dc;padding-left:24px}code{font-family:ui-monospace,Consolas,monospace;color:#85e5cb}pre{padding:20px;overflow-x:auto;background:#070d16;border:1px solid #29384d;border-radius:12px;line-height:1.8;color:#d7e5f7}pre code{white-space:pre}.command-row{justify-content:space-between}.command-row small{display:block}.copy-btn,.primary-btn{border:1px solid #365575;background:#1a3550;color:#e7f1ff;padding:9px 13px;border-radius:8px;cursor:pointer}.quiz-form fieldset{margin:0;display:grid;gap:10px}.quiz-form label{display:flex;gap:9px;align-items:flex-start;color:#c0cee0}.primary-btn{background:#3cbd9b;color:#061a19;font-weight:800}#quiz-result{color:#7de2ca;font-weight:700}.study-footer{padding:30px 0;color:#8fa2ba;font-size:.9rem}@media(max-width:750px){.hero,.roadmap-section{grid-template-columns:1fr}.hero-art{min-height:210px}.stats{grid-template-columns:repeat(3,minmax(0,1fr))}.card-grid{grid-template-columns:1fr}.site-header nav{gap:10px}.topic-grid{grid-template-columns:repeat(2,minmax(0,1fr))}main{padding:0 16px}.library-tools{flex-direction:column}.search-box input{width:100%}footer{flex-wrap:wrap}}@media(max-width:520px){.topic-grid,.subnet-facts{grid-template-columns:1fr}.study-nav a{padding:7px;font-size:.78rem}.command-row{align-items:flex-start}.study-hero{padding-top:35px}}