@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800;900&family=JetBrains+Mono:wght@400;500;600&display=swap');
/* Re-skinned to match DataXForge's editorial design system. The notebook
   defaults to LIGHT (body.light-theme, set in the HTML); :root below is the
   DARK toggle state, mapped to DataXForge's .dark palette. */
:root{
--font-ui:'Inter',ui-sans-serif,system-ui,-apple-system,'Segoe UI',sans-serif;
--font-display:'Inter',ui-sans-serif,system-ui,-apple-system,'Segoe UI',sans-serif;
--font-mono:'JetBrains Mono',ui-monospace,SFMono-Regular,Consolas,monospace;
/* accent family — DataXForge indigo/leaf/forge */
--blue:#8aa0f7;--blue-d:#6f86f5;
--green:#34d399;--green-d:#059669;
--red:#f87171;--red-d:#dc2626;
--amber:#fb923c;--amber-d:#ea580c;
--purple:#a394f5;--purple-d:#7c6cf0;
--cyan:#22d3ee;
--pink:#ec4899;
/* surfaces — DataXForge .dark tokens */
--bg:#0a0e17;--panel:#0e1320;--panel2:#141a2b;--raised:#212a3f;
--line:#2b3346;--line2:#38415a;
--ink:#eef2f9;--ink2:#b9c2d4;--ink3:#8b93a7;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
html,body{max-width:100%;overflow-x:hidden}
body{font-family:var(--font-ui);font-size:15px;color:var(--ink);min-height:100vh;background:var(--bg)}

/* progress */
.progress-wrap{position:fixed;top:0;left:300px;right:0;height:4px;background:#0a0e15;z-index:100}
.progress-fill{height:100%;background:var(--blue)}

/* sidebar */
.sidebar{width:300px;min-width:300px;background:#10151e;border-right:1px solid var(--line);padding:0 0 1.5rem;position:fixed;top:0;left:0;height:100vh;overflow-y:auto;z-index:10}
.sidebar-logo{padding:1.4rem 1.2rem 1.2rem;background:#161b26;border-bottom:3px solid var(--blue)}
.sidebar-logo h2{font-family:var(--font-display);font-size:16px;font-weight:800;color:#fff;letter-spacing:-.01em}
.sidebar-tools{padding:.9rem 1rem 1rem;display:grid;gap:.6rem;border-bottom:1px solid var(--line);margin-bottom:.4rem}
.search-input{width:100%;padding:.65rem .8rem;border-radius:10px;border:1px solid var(--line2);background:#0d1117;color:var(--ink);font-size:13px;font-weight:500;outline:none;transition:.15s}
.search-input::placeholder{color:var(--ink3)}
.search-input:focus{border-color:var(--blue);box-shadow:0 0 0 3px rgba(59,130,246,.2)}
.tool-row{display:flex;gap:.55rem}
.tool-btn{flex:1;padding:.55rem .7rem;border-radius:8px;border:1px solid var(--line2);background:var(--raised);color:#cbd5e1;font-size:12px;font-weight:700;cursor:pointer;transition:.15s}
.tool-btn:hover{color:#fff;border-color:var(--blue);background:#26304a}
.chapter-stats{font-size:12px;font-weight:700;color:#fff;background:var(--blue-d);padding:.55rem;border-radius:8px;text-align:center;letter-spacing:.03em}
.docs-box{display:grid;grid-template-columns:1fr auto auto;gap:.45rem;align-items:center}
.doc-select{width:100%;padding:.55rem;border-radius:8px;border:1px solid var(--line2);background:#0d1117;color:var(--ink);font-size:12px;outline:none}
.doc-select:focus{border-color:var(--blue)}
.tool-btn.secondary{flex:0 0 auto;padding:.55rem .65rem}
.doc-note{font-size:11px;color:var(--ink3);line-height:1.55}

/* nav */
#nav{padding:.5rem .6rem}
.nav-item{display:flex;align-items:center;gap:11px;padding:10px 12px;margin:2px 0;cursor:pointer;font-size:13.5px;font-weight:600;color:var(--ink2);border-radius:9px;border-left:3px solid transparent;transition:.14s}
.nav-item:hover{color:#fff;background:#1a2030}
.nav-item.active{color:#fff;background:#1c2740;border-left-color:var(--blue)}
.nav-item.hidden{display:none}
.nav-item.bookmarked{color:#fcd34d;border-left-color:var(--amber)}
.nav-num{font-size:11px;color:#cbd5e1;min-width:24px;height:20px;display:flex;align-items:center;justify-content:center;font-family:var(--font-display);font-weight:700;background:#222b3d;border-radius:6px}
.nav-item.active .nav-num{background:var(--blue);color:#fff}
.nav-item.bookmarked .nav-num{background:var(--amber);color:#1a1206}

/* content */
.content{min-width:0;margin-left:300px;padding:clamp(1.25rem,2.2vw,2.5rem);width:auto;max-width:none;position:relative;z-index:1;display:flex;flex-direction:column;gap:1.2rem}
.site-footer{margin-left:300px;padding:1.1rem clamp(1.25rem,2.2vw,2.5rem) 1.4rem;border-top:1px solid var(--line);display:flex;justify-content:space-between;align-items:center;gap:1rem;flex-wrap:wrap;background:#10151e}
.footer-profile{display:flex;align-items:center;gap:.75rem}
.footer-avatar{width:44px;height:44px;border-radius:10px;object-fit:cover;border:2px solid var(--blue)}
.site-credit{font-size:13px;color:var(--ink2)}
.site-credit strong{color:#fff}
.wa-link{display:inline-flex;align-items:center;gap:.5rem;padding:.55rem .9rem;border-radius:8px;border:1px solid var(--green-d);background:var(--green-d);color:#fff;text-decoration:none;font-size:12.5px;font-weight:700;transition:.15s}
.wa-link:hover{background:var(--green)}
.wa-icon{width:16px;height:16px}

/* chapter card */
.chapter{display:none;width:100%;background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:2.2rem 2.3rem 1.7rem;box-shadow:0 12px 40px rgba(0,0,0,.35);position:relative;overflow:hidden}
.chapter::before{content:'';position:absolute;inset:0 0 auto 0;height:4px;background:var(--blue)}
.chapter.active{display:block}
.ch-tag{font-family:var(--font-display);font-size:11px;font-weight:700;color:#fff;background:var(--blue-d);padding:6px 14px;border-radius:6px;display:inline-block;margin-bottom:1rem;letter-spacing:.08em;text-transform:uppercase}
.ch-title{font-family:var(--font-display);font-size:clamp(30px,3.3vw,42px);font-weight:800;margin-bottom:.65rem;letter-spacing:-.03em;line-height:1.07;color:#fff}
.ch-desc{font-size:15.5px;color:var(--ink2);line-height:1.75;margin-bottom:1.4rem;padding-bottom:1.4rem;border-bottom:1px solid var(--line);max-width:92ch}
.chapter-meta{display:flex;flex-wrap:wrap;gap:.6rem;margin-bottom:1.1rem}
.meta-btn{padding:.5rem .9rem;border-radius:8px;background:var(--raised);border:1px solid var(--line2);color:#cbd5e1;font-size:12px;font-weight:700;cursor:pointer;transition:.15s}
.meta-btn:hover{border-color:var(--blue);color:#fff}
.meta-btn.done{border-color:var(--green);color:#bbf7d0;background:rgba(34,197,94,.14)}
.meta-btn.starred{border-color:var(--amber);color:#fde68a;background:rgba(245,158,11,.14)}

/* section titles */
.section-title{font-family:var(--font-display);display:flex;align-items:center;gap:.65rem;font-size:17px;font-weight:700;margin:1.9rem 0 .85rem;color:#fff;letter-spacing:-.01em}
.section-title::before{content:'';width:5px;height:21px;border-radius:3px;background:var(--blue)}

/* hero */
.front-hero{margin:.3rem 0 1.3rem;padding:1.5rem 1.6rem;border-radius:14px;background:var(--panel2);border:1px solid var(--line2);border-left:5px solid var(--blue)}
.front-hero h3{font-family:var(--font-display);font-size:22px;line-height:1.3;color:#fff;margin-bottom:.5rem;letter-spacing:-.02em}
.front-hero p{font-size:14.5px;color:var(--ink2);max-width:none;margin:.3rem 0 1rem}
.front-badges{display:flex;flex-wrap:wrap;gap:.5rem}
.front-badge{padding:.38rem .75rem;border-radius:6px;background:#0d1117;border:1px solid var(--line2);font-size:12px;font-weight:600;color:#7dd3fc}

/* quick grid - rotating accent colors */
.quick-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(225px,1fr));gap:.85rem;margin:.7rem 0 1.1rem}
.quick-card{padding:1rem 1.05rem;border-radius:12px;background:var(--panel2);border:1px solid var(--line);border-top:3px solid var(--blue);transition:.15s}
.quick-card:nth-child(4n+2){border-top-color:var(--green)}
.quick-card:nth-child(4n+3){border-top-color:var(--purple)}
.quick-card:nth-child(4n+4){border-top-color:var(--amber)}
.quick-card:hover{border-color:var(--line2);transform:translateY(-2px)}
.quick-card h4{font-family:var(--font-display);font-size:13px;color:#fff;margin-bottom:.35rem}
.quick-card p{font-size:13px;color:var(--ink2);line-height:1.6;max-width:none}

/* callouts */
.note,.warn,.tip{padding:1rem 1.2rem;border-radius:12px;font-size:14px;margin:1rem 0;line-height:1.7;border:1px solid;border-left-width:5px}
.note{background:rgba(59,130,246,.1);border-color:rgba(59,130,246,.3);border-left-color:var(--blue);color:#c5dcfa}
.warn{background:rgba(245,158,11,.1);border-color:rgba(245,158,11,.32);border-left-color:var(--amber);color:#fde6ba}
.tip{background:rgba(34,197,94,.1);border-color:rgba(34,197,94,.32);border-left-color:var(--green);color:#c4f0d0}

/* workflow - rotating colors */
.workflow{list-style:none;counter-reset:wf;margin:1rem 0 0;padding:0;display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:.95rem}
.workflow li{counter-increment:wf;position:relative;padding:1.05rem 1.05rem 1.05rem 3.3rem;background:var(--panel2);border:1px solid var(--line);border-radius:12px;color:var(--ink2);line-height:1.65;min-height:118px}
.workflow li::before{content:counter(wf);position:absolute;left:1rem;top:1.05rem;width:1.7rem;height:1.7rem;background:var(--blue);color:#fff;border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:800}
.workflow li:nth-child(3n+2)::before{background:var(--green)}
.workflow li:nth-child(3n+3)::before{background:var(--purple)}
.workflow strong{display:block;color:#fff;margin-bottom:.2rem;font-family:var(--font-display)}
.workflow span{display:block;color:var(--ink2)}

/* code */
.code-block{position:relative;margin:1.05rem 0 1.25rem}
.code-label{font-size:11px;color:var(--ink3);margin-bottom:6px;font-family:var(--font-display);font-weight:700;text-transform:uppercase;letter-spacing:.07em}
.code-block pre{background:#0a0e15;border:1px solid var(--line2);border-radius:12px;padding:1.2rem 1.4rem;font-family:var(--font-mono);font-size:13px;line-height:1.8;overflow-x:auto;color:#e5eef9;border-left:4px solid var(--cyan)}
.code-block.lang-python pre{border-left-color:var(--blue)}
.code-block.lang-python .code-label{color:var(--blue)}
.code-block.lang-terminal pre{border-left-color:var(--green)}
.code-block.lang-terminal .code-label{color:var(--green)}
.code-block.lang-layout pre{border-left-color:var(--amber)}
.code-block.lang-layout .code-label{color:var(--amber)}
.code-block.lang-generic pre{border-left-color:var(--purple)}
.copy-btn{position:absolute;top:32px;right:13px;background:var(--raised);border:1px solid var(--line2);border-radius:7px;padding:5px 11px;font-size:11px;cursor:pointer;color:#cbd5e1;font-family:inherit;font-weight:700;transition:.15s}
.copy-btn:hover{background:#2a3550;color:#fff;border-color:var(--blue)}
.kw{color:#f472b6}.fn{color:#38bdf8}.st{color:#86efac}.cm{color:var(--ink3);font-style:italic}.num{color:#fbbf24}.op{color:#fb7185}

/* steps */
.steps{list-style:none;counter-reset:step;margin:.6rem 0}
.steps li{counter-increment:step;padding:.8rem 0 .8rem 2.9rem;position:relative;font-size:14px;color:var(--ink2);line-height:1.65;border-bottom:1px solid var(--line)}
.steps li::before{content:counter(step);position:absolute;left:0;top:.65rem;width:23px;height:23px;background:var(--blue);color:#fff;border-radius:7px;display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:800}

/* nav footer */
.nav-footer{display:flex;justify-content:space-between;align-items:center;margin-top:2rem;padding-top:1.4rem;border-top:1px solid var(--line)}
.nav-btn{padding:.65rem 1.3rem;border:1px solid var(--line2);border-radius:8px;cursor:pointer;font-size:13px;font-weight:700;color:#cbd5e1;background:var(--raised);font-family:inherit;transition:.15s}
.nav-btn:hover{color:#fff;border-color:var(--blue)}
.nav-btn.primary{background:var(--blue-d);border-color:var(--blue-d);color:#fff}
.nav-btn.primary:hover{background:var(--blue)}

/* tables */
table.ref{width:100%;border-collapse:separate;border-spacing:0;font-size:13px;margin:1rem 0;border-radius:12px;overflow:hidden;border:1px solid var(--line2)}
table.ref th{background:#1d2433;padding:11px 14px;text-align:left;font-family:var(--font-display);font-weight:700;color:#fff;font-size:11.5px;text-transform:uppercase;letter-spacing:.05em;border-bottom:2px solid var(--blue)}
table.ref td{padding:11px 14px;border-bottom:1px solid var(--line);color:var(--ink2);vertical-align:top}
table.ref tr:last-child td{border-bottom:none}
table.ref tr:nth-child(even) td{background:rgba(255,255,255,.015)}
table.ref tbody tr:hover td{background:rgba(59,130,246,.07)}
table.ref td code{font-family:var(--font-mono);font-size:12px;color:#7dd3fc}
p{font-size:14.5px;color:var(--ink2);line-height:1.75;margin:.5rem 0;max-width:92ch}

/* mistakes */
.mistakes{list-style:none;margin:.6rem 0 1rem;padding:0;display:grid;gap:.55rem}
.mistakes li{padding:.8rem 1rem .8rem 2.4rem;background:rgba(239,68,68,.1);border:1px solid rgba(239,68,68,.3);border-left:4px solid var(--red);border-radius:10px;color:#fecaca;font-size:13px;line-height:1.6;position:relative}
.mistakes li::before{content:'\2717';position:absolute;left:.9rem;top:.8rem;color:var(--red);font-weight:800}

/* practice + cheat */
.practice-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:.85rem;margin:.85rem 0}
.practice-card{background:var(--panel2);border:1px solid var(--line);border-top:3px solid var(--purple);border-radius:12px;padding:1rem}
.practice-card h4{font-family:var(--font-display);font-size:13px;color:#fff;margin-bottom:.5rem}
.practice-card p{font-size:13px;color:var(--ink2);max-width:none}
.cheat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:.75rem;margin:.85rem 0 1rem}
.cheat-item{background:var(--panel2);border:1px solid var(--line2);border-left:4px solid var(--cyan);border-radius:10px;padding:.7rem .85rem;font-size:12.5px;color:#c8d4ea}
.cheat-item code{color:#67e8f9;font-family:var(--font-mono)}

/* decision tree - purple themed */
.dtree{margin:1rem 0 1.2rem}
.dtree-label{font-size:11px;color:#c4b5fd;margin-bottom:6px;font-family:var(--font-display);font-weight:700;text-transform:uppercase;letter-spacing:.06em}
.dtree pre{background:#15101f;border:1px solid #3a2c5a;border-left:4px solid var(--purple);border-radius:12px;padding:1.2rem 1.4rem;font-family:var(--font-mono);font-size:13px;line-height:1.75;overflow-x:auto;color:#e2d5f5}
.dtree pre .leaf{color:#6ee7b7;font-weight:700}
.dtree pre .branch{color:#fcd34d}

/* recommendation box - green themed */
.rec-box{margin:1.05rem 0 1.25rem;padding:1.2rem 1.35rem;border-radius:14px;background:rgba(34,197,94,.1);border:1px solid rgba(34,197,94,.35);border-left:5px solid var(--green)}
.rec-box h4{font-family:var(--font-display);font-size:14px;font-weight:700;color:#86efac;text-transform:uppercase;letter-spacing:.06em;margin-bottom:.7rem;display:flex;align-items:center;gap:.5rem}
.rec-box h4::before{content:'\2605';color:var(--amber);font-size:15px}
.rec-box p{color:#cdeed7}
.rec-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(185px,1fr));gap:.6rem}
.rec-item{background:#0e1518;border:1px solid rgba(34,197,94,.25);border-radius:10px;padding:.65rem .8rem}
.rec-item .rk{display:block;font-size:10.5px;color:#6ee7b7;text-transform:uppercase;letter-spacing:.06em;font-weight:800;margin-bottom:.2rem}
.rec-item .rv{display:block;font-size:13.5px;color:#eafff1;font-weight:700;font-family:var(--font-display)}

/* good/bad grid */
.gb-grid{display:grid;grid-template-columns:1fr 1fr;gap:.95rem;margin:1rem 0 1.2rem}
.gb-card{border-radius:12px;padding:1.05rem 1.1rem;font-size:13.5px;line-height:1.65;border:1px solid;border-left-width:5px}
.gb-card h5{font-family:var(--font-display);font-size:13px;font-weight:700;text-transform:uppercase;letter-spacing:.05em;margin-bottom:.55rem;display:flex;align-items:center;gap:.5rem}
.gb-bad{background:rgba(239,68,68,.1);border-color:rgba(239,68,68,.34);border-left-color:var(--red)}
.gb-bad h5{color:#fecaca}.gb-bad h5::before{content:'\2717';color:var(--red);font-size:15px}
.gb-bad,.gb-bad code{color:#fecaca}
.gb-good{background:rgba(34,197,94,.1);border-color:rgba(34,197,94,.34);border-left-color:var(--green)}
.gb-good h5{color:#86efac}.gb-good h5::before{content:'\2713';color:var(--green);font-size:15px}
.gb-good,.gb-good code{color:#cdeed7}
.gb-card code{font-family:var(--font-mono);font-size:12px;background:rgba(0,0,0,.3);padding:2px 6px;border-radius:5px;display:inline-block;margin-top:.2rem}

/* ratings + table accents */
table.ref td .stars{color:var(--amber);letter-spacing:2px;font-size:14px}
table.ref td.use{color:#6ee7b7}
table.ref td.avoid{color:#fca5a5}

/* case head - cyan */
.case-head{margin:1.3rem 0 .3rem;padding:.8rem 1.1rem;border-radius:12px;background:rgba(6,182,212,.12);border:1px solid rgba(6,182,212,.3);border-left:5px solid var(--cyan);font-family:var(--font-display);font-weight:700;font-size:15.5px;color:#fff;letter-spacing:-.01em}

/* pipeline */
.pipeline{list-style:none;counter-reset:pp;margin:.8rem 0 1.1rem;padding:0;display:flex;flex-wrap:wrap;gap:.6rem;align-items:center}
.pipeline li{counter-increment:pp;position:relative;padding:.55rem .85rem .55rem 2rem;background:var(--panel2);border:1px solid var(--line2);border-radius:8px;font-size:13px;color:#dbeafe;font-weight:700;font-family:var(--font-display)}
.pipeline li::before{content:counter(pp);position:absolute;left:.4rem;top:50%;transform:translateY(-50%);width:1.25rem;height:1.25rem;background:var(--blue);color:#fff;border-radius:6px;display:flex;align-items:center;justify-content:center;font-size:11px;font-weight:800}
.pipeline li:not(:last-child)::after{content:'\2192';position:absolute;right:-.7rem;top:50%;transform:translateY(-50%);color:var(--ink3);font-weight:800;font-size:14px}

/* DataXForge no-code tool callout */
.xforge{margin:1rem 0;padding:.85rem 1.05rem;border-radius:12px;background:rgba(6,182,212,.09);border:1px solid rgba(6,182,212,.3);border-left:5px solid var(--cyan);font-size:13.5px;color:#bfe9f3;line-height:1.7}
.xf-tag{display:inline-flex;align-items:center;gap:.35rem;font-family:var(--font-display);font-size:10.5px;font-weight:800;text-transform:uppercase;letter-spacing:.06em;color:#04141a;background:var(--cyan);padding:3px 9px;border-radius:6px;margin-right:.55rem;vertical-align:middle}
.xf-tag::before{content:'\2692'}
.xforge a{color:#22d3ee;font-weight:700;text-decoration:none;border-bottom:1px solid rgba(34,211,238,.45);white-space:nowrap}
.xforge a:hover{color:#67e8f9;border-bottom-color:#67e8f9}
.xforge .xf-sep{color:var(--ink3)}

/* ===== LIGHT THEME ===== */
body.light-theme{--bg:#f7f9fd;--panel:#ffffff;--panel2:#f1f4fb;--raised:#e9edf6;--line:#dadfeb;--line2:#c7cfde;--ink:#0b1120;--ink2:#4b5569;--ink3:#6b7280;--blue:#4f46e5;--blue-d:#4338ca;--green:#059669;--green-d:#047857;--amber:#ea580c;--amber-d:#c2410c;--purple:#6d5dd3;--purple-d:#5b4bc4;color:#0b1120;background:#f7f9fd}
body.light-theme .sidebar{background:#fff;border-right:1px solid var(--line)}
body.light-theme .sidebar-logo{background:#f7f9fc}
body.light-theme .sidebar-logo h2{color:#0f172a}
body.light-theme .search-input,body.light-theme .doc-select{background:#f4f6fb;color:#0f172a}
body.light-theme .tool-btn{background:#eef1f6;color:#334155}
body.light-theme .tool-btn:hover{background:#e3eafd;color:#0f172a}
body.light-theme .chapter-stats{color:#fff}
body.light-theme .nav-item{color:#4a5568}
body.light-theme .nav-item:hover{background:#f1f4fa;color:#0f172a}
body.light-theme .nav-item.active{color:#0b1120;background:#eef0fe}
body.light-theme .nav-num{background:#e8ecf4;color:#334155}
body.light-theme .nav-item.active .nav-num{color:#fff}
body.light-theme .doc-note{color:#64748b}
body.light-theme .chapter{background:#fff;border-color:var(--line);box-shadow:0 10px 30px rgba(15,23,42,.07)}
body.light-theme .ch-title{color:#0f172a}
body.light-theme .ch-desc{color:#4a5568}
body.light-theme .section-title{color:#0f172a}
body.light-theme p,body.light-theme .quick-card p,body.light-theme .practice-card p{color:#4a5568}
body.light-theme .front-hero{background:#f7f9fc;border-color:var(--line2)}
body.light-theme .front-hero h3{color:#0f172a}
body.light-theme .front-hero p{color:#4a5568}
body.light-theme .front-badge{background:#fff;color:#4338ca;border-color:#cbd5e1}
body.light-theme .quick-card,body.light-theme .workflow li,body.light-theme .practice-card,body.light-theme .cheat-item,body.light-theme .pipeline li{background:#f7f9fc;border-color:var(--line)}
body.light-theme .quick-card h4,body.light-theme .practice-card h4,body.light-theme .workflow strong{color:#0f172a}
body.light-theme .workflow span{color:#4a5568}
body.light-theme .note{background:rgba(79,70,229,.09);color:#3730a3}
body.light-theme .warn{background:rgba(245,158,11,.13);color:#92580a}
body.light-theme .tip{background:rgba(34,197,94,.12);color:#15803d}
body.light-theme .code-label{color:var(--ink3)}
body.light-theme .code-block pre{background:#0d1320;color:#e5eef9}
body.light-theme .copy-btn{background:#1d2738;color:#cbd5e1}
body.light-theme table.ref{border-color:var(--line2)}
body.light-theme table.ref th{background:#eef2f9;color:#1e293b}
body.light-theme table.ref td{color:#334155;border-bottom-color:var(--line)}
body.light-theme table.ref tr:nth-child(even) td{background:#f8fafc}
body.light-theme table.ref tbody tr:hover td{background:rgba(59,130,246,.06)}
body.light-theme table.ref td code{color:#0e7490}
body.light-theme table.ref td.use{color:#15803d}
body.light-theme table.ref td.avoid{color:#dc2626}
body.light-theme .cheat-item{color:#334155}
body.light-theme .cheat-item code{color:#0e7490}
body.light-theme .mistakes li{background:rgba(239,68,68,.09);color:#b91c1c;border-color:rgba(239,68,68,.28)}
body.light-theme .dtree-label{color:#7c3aed}
body.light-theme .dtree pre{background:#faf7ff;color:#3b0764;border-color:#ddd0f5}
body.light-theme .dtree pre .leaf{color:#047857}
body.light-theme .dtree pre .branch{color:#b45309}
body.light-theme .rec-box{background:rgba(34,197,94,.1);border-color:rgba(34,197,94,.32)}
body.light-theme .rec-box h4{color:#15803d}
body.light-theme .rec-box p{color:#14532d}
body.light-theme .rec-item{background:#fff;border-color:rgba(34,197,94,.25)}
body.light-theme .rec-item .rk{color:#047857}
body.light-theme .rec-item .rv{color:#064e3b}
body.light-theme .gb-bad{background:rgba(239,68,68,.09)}
body.light-theme .gb-bad,body.light-theme .gb-bad h5,body.light-theme .gb-bad code{color:#b91c1c}
body.light-theme .gb-good{background:rgba(34,197,94,.11)}
body.light-theme .gb-good,body.light-theme .gb-good h5,body.light-theme .gb-good code{color:#15803d}
body.light-theme .gb-card code{background:rgba(255,255,255,.7)}
body.light-theme .case-head{background:rgba(6,182,212,.12);color:#0f172a}
body.light-theme .pipeline li{color:#1e3a5f}
body.light-theme .meta-btn{background:#eef1f6;color:#334155}
body.light-theme .meta-btn:hover{color:#0f172a}
body.light-theme .nav-btn{background:#eef1f6;color:#334155}
body.light-theme .nav-btn:hover{color:#0f172a}
body.light-theme .nav-btn.primary{color:#fff}
body.light-theme .site-footer{background:#fff;border-top-color:var(--line)}
body.light-theme .site-credit{color:#4a5568}
body.light-theme .site-credit strong{color:#0f172a}
body.light-theme .progress-wrap{background:#dde3ec}
body.light-theme .xforge{background:rgba(6,182,212,.09);color:#0e5566;border-color:rgba(6,182,212,.3)}
body.light-theme .xforge a{color:#0e7490;border-bottom-color:rgba(14,116,144,.4)}
body.light-theme .xforge a:hover{color:#0891b2;border-bottom-color:#0891b2}
body.light-theme .xf-tag{color:#fff;background:#0891b2}

/* scrollbars */
::-webkit-scrollbar{width:8px;height:8px}
::-webkit-scrollbar-track{background:transparent}
::-webkit-scrollbar-thumb{background:#3a445a;border-radius:8px}
::-webkit-scrollbar-thumb:hover{background:#4a5670}

/* responsive */
@media (max-width:980px){
body{display:block}
.sidebar{position:relative;width:100%;min-width:0;height:auto;border-right:none;border-bottom:1px solid var(--line)}
.progress-wrap{left:0}
.content{margin-left:0;width:100%;padding:1rem}
.site-footer{margin-left:0;padding:1rem}
.chapter{border-radius:14px;padding:1.4rem}
.workflow,.gb-grid{grid-template-columns:1fr}
}
@media (max-width:560px){.gb-grid{grid-template-columns:1fr}}


/* ===== multi-page shell additions ===== */
.sidebar{transition:transform .22s ease}
.sidebar-head{display:flex;align-items:flex-start;justify-content:space-between;gap:.5rem;padding:1.4rem 1.2rem 1.2rem;background:#161b26;border-bottom:3px solid var(--blue)}
.sidebar-head .sidebar-logo{padding:0;background:none;border:none}
.sidebar-collapse{background:transparent;border:1px solid var(--line2);color:#cbd5e1;width:30px;height:30px;border-radius:8px;cursor:pointer;font-size:16px;line-height:1;flex:0 0 auto;transition:.15s}
.sidebar-collapse:hover{border-color:var(--blue);color:#fff}
.sb-open-btn{position:fixed;top:12px;left:12px;z-index:60;display:none;align-items:center;justify-content:center;width:42px;height:42px;border-radius:11px;background:var(--blue-d);color:#fff;border:none;cursor:pointer;font-size:18px;box-shadow:0 6px 18px rgba(0,0,0,.4)}
.sb-open-btn:hover{background:var(--blue)}
body.sb-collapsed .sidebar{transform:translateX(-100%)}
body.sb-collapsed .content,body.sb-collapsed .site-footer{margin-left:0}
body.sb-collapsed .content{max-width:100%}
body.sb-collapsed .progress-wrap{left:0}
body.sb-collapsed .sb-open-btn{display:flex}

/* nav groups (accordion) */
#nav{padding:.55rem .55rem 1rem}
.nav-group{margin:.1rem 0 .35rem}
.nav-group-header{display:flex;align-items:center;gap:.5rem;width:100%;padding:9px 11px;cursor:pointer;background:transparent;border:none;color:var(--ink3);font-family:var(--font-display);font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.08em;border-radius:8px;transition:.14s;text-align:left}
.nav-group-header:hover{color:var(--ink);background:#1a2030}
.nav-group-count{font-size:10px;color:var(--ink3);background:#222b3d;border-radius:999px;padding:1px 8px;font-family:var(--font-ui);font-weight:700}
.nav-group-chevron{margin-left:auto;transition:transform .2s ease;font-size:9px;opacity:.75}
.nav-group.collapsed .nav-group-chevron{transform:rotate(-90deg)}
.nav-group.collapsed .nav-group-items{display:none}
.nav-group-items{display:block;margin:.1rem 0 .3rem .2rem;border-left:1px solid var(--line);padding-left:.35rem}
#nav .nav-item{margin:1px 0}

/* landing page */
.home-groups{display:flex;flex-direction:column;gap:1.5rem;margin-top:.4rem}
.home-group h3{font-family:var(--font-display);font-size:14px;color:#fff;text-transform:uppercase;letter-spacing:.07em;margin-bottom:.8rem;display:flex;align-items:center;gap:.6rem}
.home-group h3::before{content:'';width:5px;height:18px;border-radius:3px;background:var(--blue)}
.home-cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(285px,1fr));gap:.85rem}
.home-card{display:block;text-decoration:none;background:var(--panel2);border:1px solid var(--line);border-left:3px solid var(--blue);border-radius:12px;padding:1rem 1.1rem;transition:.15s}
.home-card:hover{transform:translateY(-3px);border-left-color:var(--cyan);box-shadow:0 14px 30px rgba(0,0,0,.32)}
.home-card .hc-num{font-family:var(--font-display);font-size:11px;font-weight:700;color:var(--blue);letter-spacing:.05em}
.home-card h4{font-family:var(--font-display);font-size:16px;color:#fff;margin:.25rem 0 .4rem;letter-spacing:-.01em}
.home-card p{font-size:13px;color:var(--ink2);line-height:1.6;margin:0;max-width:none}
.done-flag{font-size:14px;color:var(--green);font-weight:700}

/* light theme */
body.light-theme .sidebar-head{background:#f7f9fc}
body.light-theme .sidebar-collapse{color:#334155;border-color:var(--line2)}
body.light-theme .nav-group-header:hover{background:#f1f4fa;color:#0f172a}
body.light-theme .nav-group-count{background:#e8ecf4;color:#64748b}
body.light-theme .nav-group-items{border-left-color:var(--line)}
body.light-theme .home-card{background:#f7f9fc;border-color:var(--line)}
body.light-theme .home-card h4,body.light-theme .home-group h3{color:#0f172a}
body.light-theme .home-card p{color:#4a5568}

/* mobile: sidebar becomes an overlay drawer */
@media (max-width:980px){
  .sidebar{position:fixed;top:0;left:0;width:284px;min-width:284px;height:100vh;border-right:1px solid var(--line);border-bottom:none}
  .content,.site-footer{margin-left:0}
  .progress-wrap{left:0}
  .sb-open-btn{display:flex}
  body:not(.sb-collapsed) .sidebar{box-shadow:0 0 0 100vmax rgba(0,0,0,.55)}
  body.sb-collapsed .sb-open-btn{display:flex}
}

/* =====================================================================
   Intelligent layer: search palette, Tools nav, section anchors,
   on-page TOC, reading time, back-to-top, Decision Assistant, Roadmap.
   ===================================================================== */

/* ---- global search trigger in sidebar ---- */
.global-search-btn{display:flex;align-items:center;justify-content:space-between;gap:.5rem;width:100%;padding:.6rem .75rem;border-radius:10px;border:1px solid var(--line2);background:#0d1117;color:var(--ink2);font-size:12.5px;font-weight:600;cursor:pointer;font-family:inherit;transition:.15s}
.global-search-btn:hover{border-color:var(--blue);color:#fff;background:#141b2a}
.global-search-btn kbd{font-family:var(--font-display);font-size:10px;font-weight:700;color:#cbd5e1;background:var(--raised);border:1px solid var(--line2);border-radius:5px;padding:2px 6px;letter-spacing:.04em}

/* ---- Tools nav group ---- */
.nav-tool-ico{font-size:13px!important;background:linear-gradient(135deg,var(--purple),var(--blue))!important;color:#fff!important}
.nav-tool.active{color:#fff;background:#1c2740;border-left-color:var(--purple)}

/* ---- section anchor links ---- */
.section-title{scroll-margin-top:80px;position:relative}
.sec-anchor{opacity:0;margin-left:.5rem;color:var(--blue);text-decoration:none;font-weight:700;font-size:.8em;transition:opacity .15s}
.section-title:hover .sec-anchor{opacity:.8}
.sec-anchor:hover{opacity:1!important;color:var(--cyan)}

/* ---- reading time chip ---- */
.ch-readtime{display:flex;flex-wrap:wrap;gap:.5rem;margin:-.3rem 0 1rem;font-family:var(--font-display)}
.ch-readtime span{font-size:11.5px;font-weight:700;color:var(--ink3);background:var(--panel2);border:1px solid var(--line);border-radius:7px;padding:.35rem .6rem;letter-spacing:.02em}

/* ---- on-page TOC (inline, full-width friendly) ---- */
.chap-toc{margin:1rem 0 1.4rem;background:var(--panel2);border:1px solid var(--line);border-left:3px solid var(--purple);border-radius:12px;padding:.85rem 1rem}
.chap-toc-head{display:flex;align-items:center;justify-content:space-between;font-family:var(--font-display);font-size:10.5px;font-weight:800;text-transform:uppercase;letter-spacing:.08em;color:#c4b5fd;margin-bottom:.5rem}
.chap-toc-x{background:transparent;border:1px solid var(--line2);color:var(--ink3);cursor:pointer;font-size:13px;line-height:1;border-radius:6px;width:28px;height:22px;transition:.14s}
.chap-toc-x:hover{color:#fff;border-color:var(--purple)}
.chap-toc ul{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:2px 1.1rem}
.chap-toc li{margin:0}
.chap-toc a{display:block;font-size:12.5px;color:var(--ink2);text-decoration:none;padding:.34rem .55rem;border-radius:7px;border-left:2px solid transparent;line-height:1.4;transition:.13s;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.chap-toc a:hover{color:#fff;background:#1a2030}
.chap-toc a.active{color:#fff;background:#1c2740;border-left-color:var(--purple);font-weight:700}
.chap-toc.collapsed ul{display:none}

/* ---- helpful tips box after the TOC ---- */
.chap-tips{display:flex;gap:.7rem;align-items:flex-start;margin:0 0 1.4rem;padding:.85rem 1.05rem;border-radius:12px;background:rgba(59,130,246,.08);border:1px solid rgba(59,130,246,.22);border-left:4px solid var(--blue);font-size:13px;color:var(--ink2);line-height:1.75}
.chap-tips .ct-ico{font-size:16px;flex:0 0 auto;line-height:1.4}
.chap-tips kbd{font-family:var(--font-display);font-size:10px;font-weight:700;color:#cbd5e1;background:var(--raised);border:1px solid var(--line2);border-radius:4px;padding:1px 5px;margin:0 1px}
.chap-tips a{color:#7dd3fc;font-weight:700;text-decoration:none;border-bottom:1px solid rgba(125,211,252,.4)}
.chap-tips a:hover{color:#bae6fd;border-bottom-color:#bae6fd}
.chap-tips b,.chap-tips strong{color:var(--ink)}

/* ---- in-page documentation template generator (Chapter 14) ---- */
.doc-tool{display:flex;flex-wrap:wrap;align-items:center;gap:.6rem;margin:1rem 0 1.3rem;padding:1rem 1.1rem;background:var(--panel2);border:1px solid var(--line2);border-left:4px solid var(--green);border-radius:12px}
.doc-tool label{font-family:var(--font-display);font-size:13px;font-weight:700;color:var(--ink)}
.doc-tool .doc-select{width:auto;min-width:210px;padding:.55rem .7rem;font-size:13px}
.doc-tool .nav-btn{padding:.55rem 1.05rem}
.doc-tool .dt-note{flex-basis:100%;font-size:12px;color:var(--ink3);line-height:1.6;margin-top:.1rem}
.doc-tool .dt-note code{font-family:var(--font-mono);font-size:11.5px;color:#7dd3fc}
body.light-theme .doc-tool{background:#f7f9fc;border-color:var(--line)}
body.light-theme .doc-tool .dt-note code{color:#0e7490}

/* ---- back to top ---- */
.to-top{position:fixed;bottom:22px;right:22px;width:44px;height:44px;border-radius:12px;background:var(--blue-d);color:#fff;border:none;font-size:20px;font-weight:800;cursor:pointer;box-shadow:0 8px 22px rgba(0,0,0,.4);opacity:0;pointer-events:none;transform:translateY(10px);transition:.2s;z-index:55}
.to-top.show{opacity:1;pointer-events:auto;transform:none}
.to-top:hover{background:var(--blue)}
@media (min-width:1300px){.to-top{bottom:auto;top:auto;bottom:22px}}

/* ---- command palette ---- */
body.cmdk-open{overflow:hidden}
.cmdk{position:fixed;inset:0;z-index:200;display:flex;align-items:flex-start;justify-content:center}
.cmdk[hidden]{display:none}
.cmdk-backdrop{position:absolute;inset:0;background:rgba(5,8,13,.62);backdrop-filter:blur(3px)}
.cmdk-panel{position:relative;margin-top:9vh;width:min(680px,92vw);max-height:78vh;display:flex;flex-direction:column;background:var(--panel);border:1px solid var(--line2);border-radius:16px;box-shadow:0 30px 80px rgba(0,0,0,.6);overflow:hidden;animation:cmdkin .16s ease}
@keyframes cmdkin{from{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:none}}
.cmdk-input-row{display:flex;align-items:center;gap:.7rem;padding:1rem 1.1rem;border-bottom:1px solid var(--line)}
.cmdk-ico{font-size:16px;opacity:.7}
#cmdkInput{flex:1;background:transparent;border:none;outline:none;color:var(--ink);font-size:16px;font-family:inherit;font-weight:500}
#cmdkInput::placeholder{color:var(--ink3)}
.cmdk-esc{font-family:var(--font-display);font-size:10px;font-weight:700;color:var(--ink3);background:var(--raised);border:1px solid var(--line2);border-radius:5px;padding:3px 7px}
.cmdk-results{overflow-y:auto;padding:.5rem;flex:1}
.cmdk-empty{padding:1.6rem 1.2rem;text-align:center;color:var(--ink3);font-size:13px}
.cmdk-item{display:flex;gap:.75rem;align-items:flex-start;padding:.6rem .7rem;border-radius:10px;text-decoration:none;cursor:pointer}
.cmdk-item.sel{background:#1c2740}
.cmdk-ch{flex:0 0 auto;font-family:var(--font-display);font-size:10px;font-weight:800;color:#fff;background:var(--blue-d);border-radius:6px;padding:3px 7px;margin-top:2px;letter-spacing:.03em}
.cmdk-body{min-width:0}
.cmdk-h{display:block;font-size:13.5px;font-weight:700;color:var(--ink);font-family:var(--font-display);line-height:1.4}
.cmdk-ctx{display:block;font-size:12px;color:var(--ink3);line-height:1.5;margin-top:2px;overflow:hidden;text-overflow:ellipsis;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical}
.cmdk-item mark{background:rgba(245,158,11,.28);color:#fde68a;border-radius:3px;padding:0 1px}
.cmdk-foot{display:flex;gap:1rem;align-items:center;padding:.6rem 1rem;border-top:1px solid var(--line);font-size:11px;color:var(--ink3)}
.cmdk-foot kbd{font-family:var(--font-display);font-size:10px;color:#cbd5e1;background:var(--raised);border:1px solid var(--line2);border-radius:4px;padding:1px 5px;margin-right:2px}
.cmdk-foot span:last-child{margin-left:auto;font-weight:700}

/* ---- Decision Assistant ---- */
.da-pickers{display:grid;grid-template-columns:repeat(auto-fill,minmax(215px,1fr));gap:.85rem;margin:1rem 0 .5rem}
.da-pick{text-align:left;background:var(--panel2);border:1px solid var(--line);border-top:3px solid var(--blue);border-radius:13px;padding:1.05rem 1.1rem;cursor:pointer;font-family:inherit;transition:.15s}
.da-pick:nth-child(4n+2){border-top-color:var(--green)}
.da-pick:nth-child(4n+3){border-top-color:var(--purple)}
.da-pick:nth-child(4n+4){border-top-color:var(--amber)}
.da-pick:hover{transform:translateY(-3px);border-color:var(--line2);box-shadow:0 14px 30px rgba(0,0,0,.3)}
.da-pick .da-ico{font-size:22px;display:block;margin-bottom:.45rem}
.da-pick h4{font-family:var(--font-display);font-size:15px;color:#fff;margin-bottom:.3rem}
.da-pick p{font-size:12.5px;color:var(--ink2);line-height:1.55;margin:0;max-width:none}
.da-stage{background:var(--panel2);border:1px solid var(--line2);border-radius:16px;padding:1.6rem 1.7rem;margin:1rem 0}
.da-crumbs{display:flex;flex-wrap:wrap;gap:.4rem;align-items:center;margin-bottom:1.1rem;font-size:12px;color:var(--ink3)}
.da-crumb{background:var(--raised);border:1px solid var(--line2);border-radius:7px;padding:.3rem .6rem;font-weight:600;color:#cbd5e1}
.da-crumb.path{background:rgba(59,130,246,.14);border-color:rgba(59,130,246,.3);color:#bcd6fb}
.da-q{font-family:var(--font-display);font-size:21px;font-weight:800;color:#fff;line-height:1.3;letter-spacing:-.02em;margin-bottom:.4rem}
.da-help{font-size:13.5px;color:var(--ink2);line-height:1.65;margin-bottom:1.1rem}
.da-opts{display:grid;gap:.6rem}
.da-opt{display:flex;align-items:center;justify-content:space-between;gap:1rem;text-align:left;background:var(--panel);border:1px solid var(--line2);border-radius:11px;padding:.95rem 1.1rem;cursor:pointer;font-family:inherit;color:var(--ink);font-size:14.5px;font-weight:600;transition:.14s}
.da-opt:hover{border-color:var(--blue);background:#161d2c;transform:translateX(3px)}
.da-opt .da-opt-sub{display:block;font-size:12px;font-weight:500;color:var(--ink3);margin-top:.2rem}
.da-opt .da-arrow{color:var(--blue);font-weight:800;flex:0 0 auto}
.da-actions{display:flex;gap:.6rem;flex-wrap:wrap;margin-top:1.3rem}
.da-result{background:rgba(34,197,94,.08);border:1px solid rgba(34,197,94,.3);border-left:5px solid var(--green);border-radius:16px;padding:1.5rem 1.6rem;margin:1rem 0}
.da-result .da-rtag{font-family:var(--font-display);font-size:11px;font-weight:800;text-transform:uppercase;letter-spacing:.07em;color:#86efac;margin-bottom:.5rem;display:flex;align-items:center;gap:.4rem}
.da-result .da-rtag::before{content:'\2605';color:var(--amber)}
.da-result h3{font-family:var(--font-display);font-size:24px;color:#fff;letter-spacing:-.02em;margin-bottom:.6rem}
.da-result .da-detail{font-size:14.5px;color:#cdeed7;line-height:1.75;margin-bottom:1rem}
.da-result .da-detail code{font-family:var(--font-mono);font-size:12.5px;background:rgba(0,0,0,.3);color:#7dd3fc;padding:2px 6px;border-radius:5px}
.da-rlinks{display:flex;flex-wrap:wrap;gap:.55rem}
.da-rlink{display:inline-flex;align-items:center;gap:.4rem;background:var(--blue-d);color:#fff;text-decoration:none;font-size:12.5px;font-weight:700;padding:.55rem .9rem;border-radius:9px;transition:.15s}
.da-rlink:hover{background:var(--blue)}
.da-rlink.ghost{background:var(--raised);color:#cbd5e1;border:1px solid var(--line2)}
.da-rlink.ghost:hover{color:#fff;border-color:var(--blue)}

/* ---- Roadmap ---- */
.rm-summary{display:flex;flex-wrap:wrap;gap:.85rem;margin:1rem 0 1.4rem}
.rm-stat{flex:1;min-width:150px;background:var(--panel2);border:1px solid var(--line);border-radius:13px;padding:1rem 1.15rem}
.rm-stat .rm-big{font-family:var(--font-display);font-size:30px;font-weight:800;color:#fff;line-height:1}
.rm-stat .rm-lbl{font-size:12px;color:var(--ink3);margin-top:.3rem;font-weight:600}
.rm-bar{height:9px;border-radius:6px;background:#0a0e15;border:1px solid var(--line);overflow:hidden;margin-top:.6rem}
.rm-bar i{display:block;height:100%;background:linear-gradient(90deg,var(--blue),var(--cyan));width:0}
.rm-stage{position:relative;margin:0 0 1rem;padding:1.3rem 1.4rem;background:var(--panel2);border:1px solid var(--line);border-radius:15px;border-left:5px solid var(--blue)}
.rm-stage.done{border-left-color:var(--green)}
.rm-stage-head{display:flex;align-items:center;gap:.8rem;flex-wrap:wrap;margin-bottom:.3rem}
.rm-stage-num{font-family:var(--font-display);font-size:12px;font-weight:800;color:#fff;background:var(--blue-d);border-radius:8px;padding:.3rem .65rem;letter-spacing:.04em}
.rm-stage.done .rm-stage-num{background:var(--green-d)}
.rm-stage h3{font-family:var(--font-display);font-size:19px;color:#fff;letter-spacing:-.01em;margin:0}
.rm-stage-pct{margin-left:auto;font-size:12px;font-weight:700;color:var(--ink2)}
.rm-stage-goal{font-size:13.5px;color:var(--ink2);line-height:1.65;margin:.2rem 0 .9rem}
.rm-items{display:grid;grid-template-columns:repeat(auto-fill,minmax(255px,1fr));gap:.6rem}
.rm-item{display:flex;align-items:center;gap:.6rem;background:var(--panel);border:1px solid var(--line2);border-radius:10px;padding:.6rem .75rem;text-decoration:none;transition:.14s}
.rm-item:hover{border-color:var(--blue);transform:translateY(-2px)}
.rm-item .rm-check{flex:0 0 auto;width:20px;height:20px;border-radius:6px;border:2px solid var(--line2);display:flex;align-items:center;justify-content:center;font-size:12px;color:transparent}
.rm-item.done .rm-check{background:var(--green);border-color:var(--green);color:#04240f}
.rm-item .rm-it-num{font-family:var(--font-display);font-size:11px;font-weight:700;color:var(--ink3)}
.rm-item .rm-it-title{font-size:13px;font-weight:600;color:var(--ink);line-height:1.35}
.rm-item.done .rm-it-title{color:var(--ink2)}
.rm-cta{display:flex;flex-wrap:wrap;gap:.7rem;align-items:center;background:var(--panel2);border:1px solid var(--line2);border-left:5px solid var(--cyan);border-radius:14px;padding:1.1rem 1.3rem;margin:1.2rem 0}
.rm-cta b{color:#fff;font-family:var(--font-display)}

/* ---- tools cards on home ---- */
.home-card.tool-card{border-left-color:var(--purple);background:linear-gradient(180deg,rgba(139,92,246,.07),var(--panel2))}
.home-card.tool-card:hover{border-left-color:var(--cyan)}
.home-card .hc-tool{display:inline-flex;align-items:center;gap:.4rem;font-family:var(--font-display);font-size:11px;font-weight:800;color:#c4b5fd;letter-spacing:.05em;text-transform:uppercase}

/* ---- light theme for the intelligent layer ---- */
body.light-theme .global-search-btn{background:#f4f6fb;color:#475569}
body.light-theme .global-search-btn:hover{background:#e8effd;color:#0f172a}
body.light-theme .global-search-btn kbd,body.light-theme .cmdk-esc,body.light-theme .cmdk-foot kbd{background:#eef1f6;color:#475569;border-color:var(--line2)}
body.light-theme .ch-readtime span{background:#f7f9fc;color:#64748b;border-color:var(--line)}
body.light-theme .chap-toc{background:#f7f9fc;border-color:var(--line)}
body.light-theme .chap-toc-head{color:#7c3aed}
body.light-theme .chap-toc a{color:#475569}
body.light-theme .chap-toc a:hover{background:#f1f4fa;color:#0f172a}
body.light-theme .chap-toc a.active{background:#ede9fe;color:#0f172a}
body.light-theme .cmdk-panel{background:#fff;border-color:var(--line2)}
body.light-theme .cmdk-backdrop{background:rgba(15,23,42,.35)}
body.light-theme #cmdkInput{color:#0f172a}
body.light-theme .cmdk-item.sel{background:#e8effd}
body.light-theme .cmdk-h{color:#0f172a}
body.light-theme .cmdk-item mark{background:rgba(245,158,11,.3);color:#92580a}
body.light-theme .da-pick,body.light-theme .da-stage,body.light-theme .rm-stage,body.light-theme .rm-stat,body.light-theme .rm-item,body.light-theme .rm-cta{background:#f7f9fc;border-color:var(--line)}
body.light-theme .da-pick h4,body.light-theme .da-q,body.light-theme .rm-stage h3,body.light-theme .rm-stat .rm-big,body.light-theme .rm-item .rm-it-title,body.light-theme .rm-cta b{color:#0f172a}
body.light-theme .da-opt{background:#fff;color:#0f172a;border-color:var(--line2)}
body.light-theme .da-opt:hover{background:#f1f4fa}
body.light-theme .da-result{background:rgba(34,197,94,.09)}
body.light-theme .da-result h3{color:#14532d}
body.light-theme .da-result .da-detail{color:#15532e}
body.light-theme .da-result .da-detail code{background:rgba(0,0,0,.06);color:#0e7490}
body.light-theme .da-crumb{background:#eef1f6;color:#475569}
body.light-theme .home-card.tool-card{background:linear-gradient(180deg,rgba(139,92,246,.06),#f7f9fc)}
body.light-theme .home-card .hc-tool{color:#7c3aed}
body.light-theme .chap-tips{background:rgba(59,130,246,.07);color:#475569;border-color:rgba(59,130,246,.22)}
body.light-theme .chap-tips a{color:#0e7490;border-bottom-color:rgba(14,116,144,.35)}
body.light-theme .chap-tips a:hover{color:#0891b2;border-bottom-color:#0891b2}
body.light-theme .chap-tips kbd{background:#eef1f6;color:#475569;border-color:var(--line2)}

/* ===== interactive concept calculators ===== */
.calc{margin:1.1rem 0 1.3rem;padding:1.3rem 1.4rem;background:var(--panel2);border:1px solid var(--line2);border-left:4px solid var(--cyan);border-radius:14px}
.calc-head{font-family:var(--font-display);font-size:15px;font-weight:700;color:#fff;margin-bottom:1rem;letter-spacing:-.01em}
.calc-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:.8rem;margin-bottom:.4rem}
.calc-field{display:flex;flex-direction:column;gap:.35rem;font-size:12.5px;font-weight:600;color:var(--ink2)}
.calc-input-wrap{position:relative;display:flex;align-items:center}
.calc input[type=number]{width:100%;padding:.6rem .7rem;border-radius:9px;border:1px solid var(--line2);background:#0d1117;color:var(--ink);font-size:14px;font-family:var(--font-mono);outline:none;transition:.15s}
.calc input[type=number]:focus{border-color:var(--cyan);box-shadow:0 0 0 3px rgba(6,182,212,.18)}
.calc-suffix{position:absolute;right:.6rem;font-size:11px;color:var(--ink3);pointer-events:none;font-weight:600}
.calc-out{margin-top:1rem;padding-top:1rem;border-top:1px solid var(--line)}
.calc-result{display:flex;flex-direction:column;gap:.1rem;margin-bottom:.5rem}
.calc-big{font-family:var(--font-display);font-size:30px;font-weight:800;color:#67e8f9;line-height:1.05;letter-spacing:-.02em}
.calc-lbl{font-size:12px;color:var(--ink3);font-weight:600}
.calc-note{font-size:13px;color:var(--ink2);line-height:1.65}
.calc-note strong{color:#fff}
.calc-warn{font-size:13px;color:#fca5a5}
.calc-btn{padding:.5rem .85rem;border-radius:8px;border:1px solid var(--line2);background:var(--raised);color:#cbd5e1;font-size:12px;font-weight:700;cursor:pointer;font-family:inherit;transition:.15s}
.calc-btn:hover{color:#fff;border-color:var(--cyan)}
.calc-btn.ghost{background:transparent}

/* confusion matrix */
.cm-wrap{display:flex;flex-direction:column;gap:.6rem}
.cm-table{border-collapse:separate;border-spacing:4px;align-self:flex-start}
.cm-table th{font-family:var(--font-display);font-size:11px;font-weight:700;color:var(--ink2);padding:.3rem .5rem;text-transform:uppercase;letter-spacing:.03em}
.cm-corner{background:transparent}
.cm-input{width:84px;padding:.55rem;border-radius:8px;border:1px solid var(--line2);background:#0d1117;color:var(--ink);font-size:14px;font-family:var(--font-mono);text-align:center;outline:none}
.cm-input:focus{border-color:var(--cyan);box-shadow:0 0 0 3px rgba(6,182,212,.18)}
.cm-table tr:nth-child(2) td:nth-child(2) .cm-input{border-color:rgba(34,197,94,.5)}
.cm-table tr:nth-child(3) td:nth-child(3) .cm-input{border-color:rgba(34,197,94,.5)}
.cm-table tr:nth-child(2) td:nth-child(3) .cm-input,.cm-table tr:nth-child(3) td:nth-child(2) .cm-input{border-color:rgba(239,68,68,.45)}
.cm-legend{font-size:11.5px;color:var(--ink3);line-height:1.7}
.cm-k{display:inline-block;font-family:var(--font-display);font-size:10px;font-weight:800;padding:1px 6px;border-radius:5px;margin-right:2px}
.cm-k.tp{background:rgba(34,197,94,.2);color:#86efac}.cm-k.tn{background:rgba(34,197,94,.12);color:#86efac}
.cm-k.fp,.cm-k.fn{background:rgba(239,68,68,.18);color:#fca5a5}
.cm-metrics{display:grid;gap:.7rem}
.cm-metric{display:grid;grid-template-columns:120px 64px 1fr;grid-template-areas:'name val bar' 'desc desc desc';gap:.15rem .7rem;align-items:center}
.cm-mname{grid-area:name;font-family:var(--font-display);font-size:13px;font-weight:700;color:#fff}
.cm-mval{grid-area:val;font-family:var(--font-mono);font-size:15px;font-weight:700;color:#67e8f9;text-align:right}
.cm-mbar{grid-area:bar;height:8px;border-radius:5px;background:#0a0e15;border:1px solid var(--line);overflow:hidden}
.cm-mbar i{display:block;height:100%;background:linear-gradient(90deg,var(--cyan),var(--blue));width:0;transition:width .2s}
.cm-mdesc{grid-area:desc;font-size:11.5px;color:var(--ink3)}

/* correlation */
.corr-canvas{width:100%;height:auto;background:#0a0e15;border:1px solid var(--line2);border-radius:10px;cursor:crosshair;display:block}
.corr-bar{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:.8rem;margin-top:.8rem}
.corr-btns{display:flex;flex-wrap:wrap;gap:.45rem}

/* light theme */
body.light-theme .calc,body.light-theme .cm-input,body.light-theme .calc input[type=number]{}
body.light-theme .calc{background:#f7f9fc;border-color:var(--line)}
body.light-theme .calc-head,body.light-theme .cm-mname{color:#0f172a}
body.light-theme .calc input[type=number],body.light-theme .cm-input{background:#fff;color:#0f172a}
body.light-theme .calc-big,body.light-theme .cm-mval{color:#0e7490}
body.light-theme .calc-note strong{color:#0f172a}
body.light-theme .calc-btn{background:#eef1f6;color:#334155}
body.light-theme .calc-btn:hover{color:#0f172a}
body.light-theme .corr-canvas{background:#fff}

/* ===== glossary tooltips ===== */
.gloss{border-bottom:1px dotted var(--cyan);cursor:help;position:relative;color:inherit}
.gloss:focus{outline:none}
.gloss-pop{position:absolute;left:0;bottom:calc(100% + 8px);width:min(300px,78vw);background:#0a0e15;border:1px solid var(--line2);border-left:3px solid var(--cyan);border-radius:10px;padding:.7rem .85rem;font-size:12.5px;font-weight:500;line-height:1.6;color:var(--ink2);box-shadow:0 12px 34px rgba(0,0,0,.5);opacity:0;visibility:hidden;transform:translateY(4px);transition:.15s;z-index:50;pointer-events:none;white-space:normal}
.gloss-pop b{color:#67e8f9;font-family:var(--font-display);display:block;margin-bottom:.2rem;font-size:12px;text-transform:none}
.gloss:hover .gloss-pop,.gloss:focus .gloss-pop{opacity:1;visibility:visible;transform:none}

/* ===== personal notes ===== */
.notes-btn{position:fixed;bottom:76px;right:22px;width:44px;height:44px;border-radius:12px;background:var(--raised);color:#fff;border:1px solid var(--line2);font-size:18px;cursor:pointer;box-shadow:0 8px 22px rgba(0,0,0,.4);z-index:56;transition:.15s}
.notes-btn:hover{border-color:var(--purple);background:#26304a}
.notes-btn.has::after{content:'';position:absolute;top:8px;right:8px;width:9px;height:9px;border-radius:50%;background:var(--green);border:2px solid var(--raised)}
.notes-panel{position:fixed;bottom:76px;right:22px;width:min(360px,92vw);background:var(--panel);border:1px solid var(--line2);border-radius:14px;box-shadow:0 24px 60px rgba(0,0,0,.55);z-index:57;display:flex;flex-direction:column;overflow:hidden;animation:cmdkin .16s ease}
.notes-panel[hidden]{display:none}
.notes-head{display:flex;align-items:center;justify-content:space-between;padding:.85rem 1rem;border-bottom:1px solid var(--line);font-family:var(--font-display);font-weight:700;font-size:13px;color:#fff}
.notes-x{background:transparent;border:none;color:var(--ink3);font-size:20px;cursor:pointer;line-height:1}
.notes-x:hover{color:#fff}
.notes-sub{padding:.5rem 1rem 0;font-size:11.5px;color:var(--ink3)}
.notes-ta{margin:.6rem 1rem;min-height:170px;max-height:50vh;resize:vertical;background:#0d1117;border:1px solid var(--line2);border-radius:10px;padding:.7rem .8rem;color:var(--ink);font-family:var(--font-ui);font-size:13.5px;line-height:1.6;outline:none}
.notes-ta:focus{border-color:var(--purple);box-shadow:0 0 0 3px rgba(139,92,246,.18)}
.notes-foot{display:flex;align-items:center;justify-content:space-between;padding:0 1rem 1rem}
.notes-status{font-size:11.5px;color:var(--green);font-weight:700}
.notes-clear{background:transparent;border:1px solid var(--line2);color:var(--ink3);font-size:11.5px;font-weight:700;padding:.35rem .7rem;border-radius:7px;cursor:pointer}
.notes-clear:hover{color:#fca5a5;border-color:var(--red)}

/* ===== glossary page ===== */
.gloss-search{width:100%;max-width:460px;padding:.7rem .9rem;border-radius:10px;border:1px solid var(--line2);background:#0d1117;color:var(--ink);font-size:14px;outline:none;margin:.4rem 0 1rem}
.gloss-search:focus{border-color:var(--cyan);box-shadow:0 0 0 3px rgba(6,182,212,.18)}
.gloss-count{font-size:12px;color:var(--ink3);margin-bottom:1rem}
.gloss-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:.8rem}
.gloss-card{background:var(--panel2);border:1px solid var(--line);border-left:3px solid var(--cyan);border-radius:12px;padding:.95rem 1.1rem}
.gloss-card h4{font-family:var(--font-display);font-size:14.5px;color:#fff;margin-bottom:.3rem}
.gloss-card p{font-size:13px;color:var(--ink2);line-height:1.6;margin:0;max-width:none}
.gloss-empty{color:var(--ink3);font-size:13px;padding:1rem 0}

/* light theme */
body.light-theme .gloss-pop{background:#fff;color:#475569}
body.light-theme .gloss-pop b{color:#0e7490}
body.light-theme .notes-btn{background:#eef1f6;color:#0f172a}
body.light-theme .notes-panel{background:#fff}
body.light-theme .notes-head{color:#0f172a}
body.light-theme .notes-ta,body.light-theme .gloss-search{background:#f4f6fb;color:#0f172a}
body.light-theme .gloss-card{background:#f7f9fc;border-color:var(--line)}
body.light-theme .gloss-card h4{color:#0f172a}

/* ===== code / SQL playgrounds ===== */
.pg-presets{display:flex;flex-wrap:wrap;gap:.5rem;margin:1rem 0 .8rem}
.pg-toolbar{display:flex;flex-wrap:wrap;align-items:center;gap:.7rem;margin:.2rem 0 .7rem}
.pg-status{font-size:12.5px;color:var(--ink3);font-weight:600}
.pg-editor{width:100%;min-height:240px;resize:vertical;background:#0a0e15;border:1px solid var(--line2);border-left:4px solid var(--blue);border-radius:12px;padding:1rem 1.2rem;color:#e5eef9;font-family:var(--font-mono);font-size:13.5px;line-height:1.7;outline:none;tab-size:4}
.pg-editor:focus{border-color:var(--blue);box-shadow:0 0 0 3px rgba(59,130,246,.16)}
.pg-out-label{font-family:var(--font-display);font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.07em;color:var(--ink3);margin:1.1rem 0 .4rem}
.pg-output{background:#0a0e15;border:1px solid var(--line2);border-left:4px solid var(--green);border-radius:12px;padding:1rem 1.2rem;font-family:var(--font-mono);font-size:13px;line-height:1.7;color:#cdeed7;white-space:pre-wrap;overflow-x:auto;min-height:80px;max-height:460px;overflow-y:auto}
.pg-result{background:#0a0e15;border:1px solid var(--line2);border-left:4px solid var(--green);border-radius:12px;padding:1rem 1.2rem;min-height:80px;color:var(--ink2);font-size:13px}
.pg-table-wrap{overflow-x:auto}
.pg-table{width:100%;border-collapse:separate;border-spacing:0;font-size:13px;font-family:var(--font-mono)}
.pg-table th{position:sticky;top:0;background:#1d2433;color:#fff;text-align:left;padding:8px 12px;font-family:var(--font-display);font-size:11.5px;text-transform:uppercase;letter-spacing:.04em;border-bottom:2px solid var(--green)}
.pg-table td{padding:7px 12px;border-bottom:1px solid var(--line);color:#cdeed7;white-space:nowrap}
.pg-table tr:last-child td{border-bottom:none}
.pg-table tbody tr:hover td{background:rgba(34,197,94,.06)}
.pg-null{color:var(--ink3);font-style:italic}
.pg-rowcount{margin-top:.6rem;font-size:12px;color:var(--ink3);font-weight:600}
.pg-empty{color:var(--ink3);font-size:13px}
.pg-error{color:#fca5a5;font-family:var(--font-mono);font-size:13px;white-space:pre-wrap}
.pg-schema{margin-top:.9rem;font-size:11.5px;color:var(--ink3);line-height:1.8}
.pg-schema code{font-family:var(--font-mono);color:#7dd3fc;background:rgba(0,0,0,.3);padding:2px 6px;border-radius:5px}

/* light theme */
body.light-theme .pg-editor{background:#0d1320;color:#e5eef9}
body.light-theme .pg-output{background:#f4f7fb;color:#15532e}
body.light-theme .pg-result{background:#f7f9fc}
body.light-theme .pg-table td{color:#15532e}
body.light-theme .pg-table th{color:#fff}
body.light-theme .pg-schema code{background:rgba(0,0,0,.06);color:#0e7490}

/* =====================================================================
   DataXForge global header bar (injected by nav.js on every page) +
   layout offsets so the existing fixed sidebar/content sit below it.
   ===================================================================== */
.dxf-bar{position:fixed;top:0;left:0;right:0;height:56px;z-index:200;display:flex;align-items:center;gap:.2rem;padding:0 1rem;background:var(--panel);border-bottom:1px solid var(--line)}
.dxf-brand{display:inline-flex;align-items:center;margin-right:.6rem;flex:0 0 auto}
.dxf-brand img{height:26px;width:auto;display:block}
.dxf-nav{display:flex;gap:.1rem;min-width:0}
.dxf-nav a{padding:.5rem .7rem;border-radius:8px;font-family:var(--font-ui);font-size:14px;font-weight:600;color:var(--ink2);text-decoration:none;white-space:nowrap;transition:.14s}
.dxf-nav a:hover{background:var(--panel2);color:var(--ink)}
.dxf-nav a.active{background:var(--raised);color:var(--ink)}
.dxf-cta{margin-left:auto;display:inline-flex;align-items:center;gap:.4rem;padding:.55rem .9rem;border-radius:8px;background:var(--ink);color:var(--bg);font-family:var(--font-ui);font-weight:700;font-size:13.5px;text-decoration:none;white-space:nowrap;flex:0 0 auto;transition:.14s}
.dxf-cta:hover{opacity:.9}

/* shift the existing fixed shell down by the 56px bar (applies at all widths) */
.sidebar{top:56px;height:calc(100vh - 56px)}
.progress-wrap{top:56px}
.content{padding-top:calc(56px + clamp(1.25rem,2.2vw,2.5rem))}

@media (max-width:980px){
  /* hide the editorial link row; keep brand + CTA; make room for the
     sidebar hamburger which sits at the far left of the bar */
  .dxf-nav{display:none}
  .sb-open-btn{top:7px;left:8px;z-index:250}
  .dxf-bar{padding-left:60px}
  .content{padding-top:calc(56px + 1rem)}
}