:root{
--forest:#1b3a2d;--forest-mid:#254d3c;--forest-light:#2e6049;
--cream:#faf8f4;--cream-dark:#f0ebe1;--cream-darker:#e8e2d3;
--gold:#c9973a;--gold-light:#f5e9cf;--gold-pale:#fdf6e8;--gold-dark:#a87e2e;
--text:#1c1c1c;--text-mid:#4a4a4a;--text-muted:#7a7a7a;
--white:#fff;--red:#c0392b;--red-light:#fde8e8;--green:#27ae60;--green-light:#e8f8ee;
--blue:#2980b9;--blue-light:#e8f0f8;--orange:#e67e22;--purple:#8e44ad;
--shadow-sm:0 2px 8px rgba(27,58,45,0.06);--shadow:0 4px 20px rgba(27,58,45,0.10);--shadow-lg:0 12px 40px rgba(27,58,45,0.14);
--r:14px;--rs:8px;--font-display:'Playfair Display',Georgia,serif;--font-body:'Lato',-apple-system,sans-serif;--font-mono:'JetBrains Mono',monospace;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:80px}
body{font-family:var(--font-body);background:var(--cream);color:var(--text);line-height:1.7;font-size:16px}

/* NAV */
.site-nav{background:var(--forest);padding:0 32px;display:flex;align-items:center;justify-content:space-between;height:60px;position:sticky;top:0;z-index:300;box-shadow:0 2px 16px rgba(0,0,0,.18)}
.nav-brand{font-family:var(--font-display);font-size:1.2rem;color:#fff;text-decoration:none}.nav-brand span{color:var(--gold)}
.nav-links{display:flex;gap:24px}
.nav-links a{font-size:.74rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:rgba(255,255,255,.72);transition:color .2s;text-decoration:none}
.nav-links a:hover,.nav-links a.active{color:var(--gold)}

/* HERO */
.hero{background:linear-gradient(135deg,var(--forest) 0%,var(--forest-mid) 60%,var(--forest-light) 100%);color:#fff;padding:64px 24px 56px;position:relative;overflow:hidden}
.hero::before{content:'';position:absolute;inset:0;background:radial-gradient(circle at 20% 30%,rgba(201,151,58,.12) 0%,transparent 50%),radial-gradient(circle at 80% 70%,rgba(201,151,58,.08) 0%,transparent 50%);pointer-events:none}
.hero-inner{max-width:1100px;margin:0 auto;position:relative;z-index:1}
.hero-tag{display:inline-block;background:rgba(201,151,58,.18);color:var(--gold);font-weight:900;font-size:.72rem;padding:6px 16px;border-radius:20px;letter-spacing:.1em;text-transform:uppercase;margin-bottom:16px;border:1px solid rgba(201,151,58,.3)}
.hero h1{font-family:var(--font-display);font-size:clamp(2rem,5vw,3.4rem);font-weight:700;line-height:1.15;margin-bottom:14px}
.hero h1 em{font-style:italic;color:var(--gold)}
.hero p{font-size:1.05rem;color:rgba(255,255,255,.82);max-width:680px;line-height:1.7}
.hero-stats{display:flex;gap:32px;margin-top:32px;flex-wrap:wrap}
.hero-stat{display:flex;flex-direction:column}
.hero-stat .num{font-family:var(--font-display);font-size:1.8rem;font-weight:700;color:var(--gold);line-height:1}
.hero-stat .lab{font-size:.72rem;text-transform:uppercase;letter-spacing:.08em;color:rgba(255,255,255,.6);margin-top:4px}

/* LAYOUT */
.layout{max-width:1240px;margin:0 auto;display:grid;grid-template-columns:240px 1fr;gap:40px;padding:40px 24px 60px}
.sidebar{position:sticky;top:80px;height:calc(100vh - 100px);overflow-y:auto;padding-right:8px;scrollbar-width:thin;scrollbar-color:var(--cream-dark) transparent}
.sidebar::-webkit-scrollbar{width:6px}
.sidebar::-webkit-scrollbar-thumb{background:var(--cream-dark);border-radius:3px}
.sb-section{margin-bottom:24px}
.sb-title{font-family:var(--font-display);font-size:.78rem;font-weight:700;color:var(--gold);text-transform:uppercase;letter-spacing:.1em;margin-bottom:8px;padding-bottom:6px;border-bottom:1px solid var(--cream-dark)}
.sb-link{display:block;padding:6px 10px;font-size:.78rem;color:var(--text-mid);text-decoration:none;border-radius:6px;transition:all .15s;font-weight:600;line-height:1.4}
.sb-link:hover{background:var(--gold-pale);color:var(--forest)}
.sb-link.active{background:var(--forest);color:var(--gold)}

.content{min-width:0}

/* SECTIONS */
.section{background:var(--white);border-radius:var(--r);box-shadow:var(--shadow);padding:40px 44px;margin-bottom:32px;border:1px solid rgba(27,58,45,.04)}
.section h2{font-family:var(--font-display);font-size:1.9rem;color:var(--forest);margin-bottom:8px;line-height:1.2;font-weight:700}
.section h2::before{content:'';display:inline-block;width:4px;height:24px;background:var(--gold);margin-right:14px;vertical-align:middle;border-radius:2px}
.section .lede{color:var(--text-mid);font-size:1.02rem;margin-bottom:24px;font-style:italic;border-left:3px solid var(--gold-light);padding-left:14px}
.section h3{font-family:var(--font-display);font-size:1.3rem;color:var(--forest);margin:28px 0 10px;font-weight:600}
.section h4{font-size:1rem;color:var(--forest);margin:18px 0 8px;font-weight:700;text-transform:uppercase;letter-spacing:.04em}
.section p{margin-bottom:14px;color:var(--text)}
.section ul,.section ol{margin:8px 0 16px 24px}
.section li{margin-bottom:6px}
.section strong{color:var(--forest);font-weight:700}
.section em{color:var(--text-mid);font-style:italic}

/* CALLOUTS */
.callout{display:flex;gap:14px;padding:16px 20px;border-radius:var(--rs);margin:20px 0;font-size:.93rem;line-height:1.7;border-left:4px solid}
.callout-icon{font-size:1.4rem;flex-shrink:0;line-height:1}
.callout-body{flex:1}
.callout-body strong:first-child{display:block;margin-bottom:4px;font-size:.85rem;text-transform:uppercase;letter-spacing:.04em}
.cl-tip{background:var(--gold-pale);border-color:var(--gold);color:#5a4520}
.cl-warn{background:var(--red-light);border-color:var(--red);color:#7a2520}
.cl-info{background:var(--blue-light);border-color:var(--blue);color:#1e4060}
.cl-tax{background:var(--green-light);border-color:var(--green);color:#1a4d2e}

/* DEFINITIONS */
.def-table{display:grid;grid-template-columns:140px 1fr;gap:8px 16px;background:var(--cream);border-radius:var(--rs);padding:18px 22px;margin:16px 0;font-size:.92rem}
.def-table dt{font-weight:700;color:var(--forest);font-family:var(--font-mono);font-size:.82rem;padding-top:2px}
.def-table dd{color:var(--text-mid)}

/* STRATEGY CARDS */
.strategy{background:var(--white);border-radius:var(--r);box-shadow:var(--shadow);margin-bottom:32px;overflow:hidden;border:1px solid rgba(27,58,45,.04)}
.strat-header{padding:24px 32px;background:linear-gradient(135deg,var(--forest),var(--forest-mid));color:#fff;display:flex;align-items:center;gap:16px;flex-wrap:wrap}
.strat-num{font-family:var(--font-display);font-size:2.2rem;font-weight:700;color:var(--gold);line-height:1;flex-shrink:0}
.strat-title{flex:1;min-width:200px}
.strat-title h2{font-family:var(--font-display);font-size:1.6rem;color:#fff;margin-bottom:2px;line-height:1.2}
.strat-title h2::before{display:none}
.strat-subtitle{font-size:.82rem;color:rgba(255,255,255,.7);font-style:italic}
.strat-tags{display:flex;gap:6px;flex-wrap:wrap}
.strat-tag{padding:4px 10px;border-radius:12px;font-size:.68rem;font-weight:700;letter-spacing:.04em;text-transform:uppercase;background:rgba(201,151,58,.18);color:var(--gold);border:1px solid rgba(201,151,58,.3)}
.strat-tag.bull{background:rgba(39,174,96,.18);color:#5dd590;border-color:rgba(39,174,96,.3)}
.strat-tag.bear{background:rgba(192,57,43,.18);color:#e8826f;border-color:rgba(192,57,43,.3)}
.strat-tag.neutral{background:rgba(41,128,185,.18);color:#5fa8d8;border-color:rgba(41,128,185,.3)}
.strat-tag.advanced{background:rgba(142,68,173,.18);color:#b886d3;border-color:rgba(142,68,173,.3)}

.strat-body{padding:32px}
.strat-body h3{font-family:var(--font-display);font-size:1.2rem;color:var(--forest);margin:24px 0 8px;font-weight:600}
.strat-body h3:first-child{margin-top:0}
.strat-body p{margin-bottom:12px;color:var(--text);font-size:.95rem;line-height:1.75}

/* QUICK STATS GRID */
.stat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin:20px 0}
.stat{padding:14px;background:var(--cream);border-radius:var(--rs);border:1px solid var(--cream-dark)}
.stat-lab{font-size:.66rem;text-transform:uppercase;letter-spacing:.06em;color:var(--text-muted);font-weight:700;margin-bottom:4px}
.stat-val{font-size:1.05rem;font-weight:900;color:var(--forest);font-family:var(--font-mono)}
.stat.profit{background:var(--green-light);border-color:rgba(39,174,96,.2)}.stat.profit .stat-val{color:var(--green)}
.stat.loss{background:var(--red-light);border-color:rgba(192,57,43,.2)}.stat.loss .stat-val{color:var(--red)}
.stat.bep{background:var(--blue-light);border-color:rgba(41,128,185,.2)}.stat.bep .stat-val{color:var(--blue)}
.stat.cost{background:var(--gold-pale);border-color:rgba(201,151,58,.2)}.stat.cost .stat-val{color:var(--gold-dark)}

/* PAYOFF DIAGRAM */
.payoff{background:var(--cream);border-radius:var(--rs);padding:20px;margin:20px 0;border:1px solid var(--cream-dark)}
.payoff-title{font-size:.78rem;text-transform:uppercase;letter-spacing:.06em;font-weight:700;color:var(--text-muted);margin-bottom:10px;text-align:center}
.payoff svg{width:100%;height:auto;display:block}

/* GREEKS TABLE */
.greeks-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px;margin:16px 0}
.greek-row{display:flex;justify-content:space-between;padding:10px 14px;background:var(--cream);border-radius:6px;font-size:.86rem;align-items:center}
.greek-row .gn{font-weight:700;color:var(--forest);font-family:var(--font-mono)}
.greek-row .gv{color:var(--text-mid);font-size:.82rem;text-align:right}

/* EXAMPLE BOX */
.example{background:linear-gradient(135deg,var(--gold-pale),#fff);border:1px solid var(--gold-light);border-radius:var(--rs);padding:24px 28px;margin:24px 0;box-shadow:var(--shadow-sm)}
.example-label{display:inline-block;background:var(--gold);color:#fff;font-size:.68rem;font-weight:900;letter-spacing:.08em;text-transform:uppercase;padding:4px 12px;border-radius:12px;margin-bottom:12px}
.example h4{font-family:var(--font-display);font-size:1.1rem;color:var(--forest);margin-bottom:10px;font-weight:600;text-transform:none;letter-spacing:0}
.example .calc{font-family:var(--font-mono);background:rgba(255,255,255,.7);padding:14px 18px;border-radius:6px;margin:12px 0;font-size:.85rem;border:1px solid var(--cream-dark);line-height:1.9}
.example .calc-line{display:flex;justify-content:space-between;padding:2px 0}
.example .calc-line.total{border-top:1px solid var(--gold);padding-top:6px;margin-top:6px;font-weight:900}

/* INTERACTIVE TOOLS */
.tool{background:linear-gradient(135deg,var(--forest),var(--forest-mid));color:#fff;border-radius:var(--r);padding:32px;margin:24px 0;box-shadow:var(--shadow-lg)}
.tool h3{font-family:var(--font-display);color:var(--gold);font-size:1.4rem;margin-bottom:6px}
.tool-sub{font-size:.85rem;color:rgba(255,255,255,.7);margin-bottom:20px}
.tool-controls{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:14px;margin-bottom:20px}
.tool-control label{display:block;font-size:.72rem;text-transform:uppercase;letter-spacing:.06em;color:rgba(255,255,255,.6);margin-bottom:4px;font-weight:700}
.tool-control select,.tool-control input{width:100%;padding:10px 12px;border-radius:6px;border:1px solid rgba(255,255,255,.18);background:rgba(255,255,255,.08);color:#fff;font-family:var(--font-body);font-size:.88rem;font-weight:700}
.tool-control select option{background:var(--forest);color:#fff}
.tool-control input[type="range"]{padding:0;accent-color:var(--gold)}
.range-row{display:flex;justify-content:space-between;font-size:.72rem;color:rgba(255,255,255,.5);margin-top:2px}
.tool-output{background:rgba(0,0,0,.2);border-radius:8px;padding:20px;margin-top:16px}
.tool-output svg{width:100%;height:auto}

.tool-results{display:grid;grid-template-columns:repeat(auto-fit,minmax(120px,1fr));gap:12px;margin-top:16px}
.tool-result{padding:12px;background:rgba(255,255,255,.05);border-radius:6px;border:1px solid rgba(255,255,255,.1)}
.tool-result .lab{font-size:.66rem;text-transform:uppercase;letter-spacing:.06em;color:rgba(255,255,255,.5);margin-bottom:4px}
.tool-result .val{font-family:var(--font-mono);font-size:1.15rem;font-weight:700;color:var(--gold)}

.toc{background:var(--cream);border-radius:var(--r);padding:24px 32px;margin-bottom:32px;border:1px solid var(--cream-dark)}
.toc h3{font-family:var(--font-display);color:var(--forest);font-size:1.1rem;margin-bottom:14px;font-weight:600}
.toc-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:8px}
.toc a{font-size:.82rem;color:var(--text-mid);text-decoration:none;padding:6px 10px;border-radius:6px;transition:all .15s;display:block}
.toc a:hover{background:var(--gold-pale);color:var(--forest)}
.toc a .num{color:var(--gold);font-weight:700;font-family:var(--font-mono);margin-right:6px}

/* FOOTER */
.site-footer{background:var(--forest);color:rgba(255,255,255,.7);padding:32px 24px;text-align:center;font-size:.82rem;margin-top:40px}
.site-footer a{color:var(--gold);text-decoration:none;font-weight:700}
.site-footer .fb{font-family:var(--font-display);font-size:1rem;color:#fff;margin-bottom:6px}
.site-footer .fb span{color:var(--gold)}

@media(max-width:980px){
.layout{grid-template-columns:1fr;padding:20px 16px 40px}
.sidebar{position:static;height:auto;max-height:none;overflow:visible;display:none}
.sidebar.mobile-open{display:block;background:var(--white);padding:20px;border-radius:var(--r);margin-bottom:20px}
.section{padding:28px 24px}
.strat-body{padding:24px 20px}
.stat-grid{grid-template-columns:repeat(2,1fr)}
.greeks-grid{grid-template-columns:1fr}
.def-table{grid-template-columns:1fr}
.def-table dt{padding-top:12px;border-top:1px solid var(--cream-dark)}
.def-table dt:first-child{padding-top:0;border-top:none}
}
@media(max-width:480px){
.section{padding:24px 18px}
.section h2{font-size:1.5rem}
.strat-header{padding:20px 18px}
.strat-num{font-size:1.8rem}
.strat-title h2{font-size:1.3rem}
.example{padding:20px}
}