:root { --navy:#071927; --ink:#10212c; --lime:#b9ff66; --coral:#ff6b5f; --cream:#f5f0e7; --paper:#fffdf8; --line:#d9dedb; --muted:#65717a; --accent:#b9ff66; }
* { box-sizing:border-box; }
html { scroll-behavior:smooth; }
body { margin:0; background:var(--paper); color:var(--ink); font-family:Tahoma,Arial,sans-serif; overflow-x:hidden; }
a { color:inherit; text-decoration:none; }
button,input,select { font:inherit; }
.shell { width:min(1180px,calc(100% - 40px)); margin-inline:auto; }
.site-header { height:76px; background:rgba(7,25,39,.97); color:#fff; position:sticky; top:0; z-index:50; border-bottom:1px solid rgba(255,255,255,.1); backdrop-filter:blur(15px); }
.nav-wrap { height:100%; display:flex; align-items:center; gap:48px; }
.brand { display:flex; align-items:center; gap:11px; margin-left:auto; direction:ltr; }
.brand-mark { width:38px; height:38px; display:grid; place-items:center; background:var(--lime); color:var(--navy); font-weight:900; font-size:22px; transform:rotate(-4deg); }
.brand b,.brand small { display:block; letter-spacing:.08em; line-height:1; }
.brand b { font-size:14px; }.brand small { color:var(--lime); font-size:9px; margin-top:5px; letter-spacing:.25em; }
.site-header nav { display:flex; gap:30px; font-size:14px; color:#ced8de; }
.site-header nav a:hover { color:var(--lime); }
.nav-cta { border:1px solid #4d5d67; padding:11px 18px; font-size:13px; font-weight:700; }.nav-cta span{color:var(--lime)}
.hero { min-height:700px; position:relative; color:#fff; overflow:hidden; background:var(--navy); }
.hero>img { object-fit:cover; object-position:center; }.hero>.hero-bg{position:absolute;inset:0;width:100%;height:100%}
.hero-shade { position:absolute; inset:0; background:linear-gradient(90deg,rgba(7,25,39,.12),rgba(7,25,39,.58) 50%,rgba(7,25,39,.98) 100%); }
.hero-content { min-height:630px; position:relative; display:flex; align-items:center; z-index:2; }
.hero-copy { max-width:635px; padding:50px 0 65px; }
.eyebrow { color:#56706b; text-transform:uppercase; letter-spacing:.11em; font-size:12px; font-weight:900; display:block; margin-bottom:16px; }
.eyebrow.light { color:var(--lime); }
.hero h1 { font-size:clamp(48px,6vw,78px); line-height:1.06; letter-spacing:-.055em; margin:0; font-weight:900; }
.hero h1 em { color:var(--lime); font-style:normal; }
.hero-copy>p { color:#d5dee2; line-height:1.9; font-size:19px; max-width:590px; margin:26px 0 30px; }
.hero-actions { display:flex; gap:12px; flex-wrap:wrap; }
.btn { min-height:54px; padding:0 23px; display:inline-flex; align-items:center; justify-content:center; gap:18px; font-weight:900; font-size:14px; border:1px solid transparent; }
.btn.primary { background:var(--lime); color:var(--navy); }.btn.primary:hover { background:#d3ff9e; }
.btn.ghost { color:#fff; border-color:#63737c; background:rgba(7,25,39,.42); }.btn.ghost:hover{border-color:#fff}
.trust-line { display:flex; gap:22px; flex-wrap:wrap; color:#aab8c0; font-size:12px; margin-top:26px; }.trust-line span::first-letter{color:var(--lime)}
.ticker { height:70px; position:absolute; bottom:0; inset-inline:0; background:var(--lime); color:var(--navy); z-index:3; overflow:hidden; border-block:1px solid rgba(0,0,0,.12); }
.ticker div { height:100%; display:flex; align-items:center; gap:52px; width:max-content; padding-inline:30px; animation:scroll 28s linear infinite; }
.ticker span { font-size:14px; font-weight:900; white-space:nowrap; }
@keyframes scroll { to{transform:translateX(35%)} }
.signal-strip { background:#fff; border-bottom:1px solid var(--line); }
.stat-row { display:grid; grid-template-columns:repeat(4,1fr); }
.stat-row a { padding:28px 23px; display:grid; border-left:1px solid var(--line); min-height:150px; transition:.2s; }.stat-row a:last-child{border-right:1px solid var(--line)}.stat-row a:hover{background:#f3f8ef}
.stat-row strong { font-size:36px; letter-spacing:-.04em; color:#17392d; }.stat-row span{font-weight:900;font-size:13px;margin:3px 0}.stat-row small{font-size:10px;color:var(--muted);align-self:end}
.section { padding-block:100px; }
.section-head { display:flex; justify-content:space-between; align-items:end; gap:50px; margin-bottom:38px; }
.section-head h2,.copy-inputs h2,.evidence h2 { font-size:clamp(36px,4.5vw,60px); line-height:1.15; letter-spacing:-.045em; margin:0; max-width:700px; }
.section-head>p { max-width:410px; color:var(--muted); line-height:1.8; margin:0; }
.platform-tabs { display:grid; grid-template-columns:repeat(10,1fr); border:1px solid var(--line); border-bottom:0; overflow:hidden; }
.platform-tabs button { min-width:0; height:92px; border:0; border-left:1px solid var(--line); background:#fff; color:var(--muted); cursor:pointer; padding:12px 4px; transition:.2s; }
.platform-tabs button:last-child{border-left:0}.platform-tabs button b,.platform-tabs button span{display:block}.platform-tabs button b{font-size:21px;color:var(--ink);margin-bottom:8px}.platform-tabs button span{font-size:10px;font-weight:900}.platform-tabs button:hover,.platform-tabs button.active{background:var(--accent);color:var(--navy)}
.platform-panel { display:grid; grid-template-columns:1.15fr .85fr 1fr; gap:0; border:1px solid #203846; color:#fff; background:var(--navy); min-height:350px; box-shadow:12px 12px 0 var(--accent); }
.platform-panel>div,.platform-panel>ol{padding:38px;border-left:1px solid #29404e}.platform-panel>ol{border:0;margin:0;list-style:none}
.platform-kicker { color:var(--accent); font-weight:900; font-size:12px; }.platform-panel h3{font-size:37px;margin:9px 0 15px}.platform-panel p{line-height:1.8;color:#b8c6ce}.pill-row{display:flex;gap:7px;flex-wrap:wrap;margin-top:25px}.pill-row span{border:1px solid #50616b;padding:7px 9px;font-size:10px;color:#dbe3e6}
.panel-metric small{color:#80929c}.panel-metric strong{display:block;font-size:21px;line-height:1.55;margin:9px 0 18px}.panel-metric a{color:var(--accent);font-size:12px;font-weight:900}
.platform-panel li{display:flex;gap:15px;align-items:center;border-bottom:1px solid #243c49;padding:14px 0;font-size:13px;line-height:1.5}.platform-panel li span{color:var(--accent);font-size:10px;font-weight:900}
.tool-zone { background:var(--navy); color:#fff; position:relative; overflow:hidden; }.tool-zone::after{content:"ROAS";position:absolute;left:-15px;top:10px;font-size:190px;font-weight:900;color:rgba(255,255,255,.018);letter-spacing:-.1em}
.section-head.inverse>p{color:#a9bac3}.calculator-grid{display:grid;grid-template-columns:.85fr 1.15fr;border:1px solid #38505d;position:relative;z-index:2}
.control-card { padding:40px;background:#102938 }.control-card>label{display:block;margin-bottom:28px;font-size:13px;font-weight:900}.control-card label output{float:left;color:var(--lime)}
.control-card select,.control-card input[type=number],.copy-inputs input{display:block;width:100%;margin-top:10px;border:1px solid #526873;background:#0a202e;color:#fff;height:54px;padding:0 15px;outline:none}.control-card select:focus,.control-card input:focus{border-color:var(--lime)}
.control-card input[type=range]{display:block;width:100%;margin-top:20px;accent-color:var(--lime)}
.split-inputs{display:grid;grid-template-columns:1fr 1fr;gap:15px}.split-inputs label{position:relative;font-size:12px;font-weight:900}.split-inputs label span{position:absolute;left:14px;bottom:19px;color:#8fa0aa;font-size:11px}
.calculator-note{color:#8fa0aa;line-height:1.8;font-size:11px;margin:0}
.result-board{padding:40px;display:grid;grid-template-rows:auto 1fr auto;background:#091e2b}.result-hero{display:grid;border-bottom:1px solid #294450;padding-bottom:30px}.result-hero small{color:#9cb0b9}.result-hero strong{font-size:70px;letter-spacing:-.06em;color:var(--lime);line-height:1.1}.result-hero strong i{font-size:18px;font-style:normal}.result-hero span{color:#81959f;font-size:12px}.result-cells{display:grid;grid-template-columns:repeat(4,1fr);align-items:center}.result-cells div{padding:23px 14px;border-left:1px solid #28414d}.result-cells div:last-child{border:0}.result-cells small,.result-cells b{display:block}.result-cells small{color:#8ea1aa;font-size:10px;margin-bottom:10px}.result-cells b{font-size:22px}.result-cells .good{color:var(--lime)}.result-cells .warn{color:var(--coral)}
.roas-track{height:38px;background:#17313e;position:relative;display:flex;align-items:center;padding-inline:13px;overflow:hidden}.roas-track span{position:absolute;inset-block:0;right:0;background:var(--coral);opacity:.7}.roas-track b{position:relative;font-size:11px;margin-right:auto}
.copy-lab{display:grid;grid-template-columns:1fr 330px .75fr;gap:45px;align-items:center}.copy-inputs label{display:block;font-weight:900;font-size:12px;margin-top:22px}.copy-inputs input{background:#fff;color:var(--ink);border-color:var(--line)}
.phone-preview{border:8px solid var(--navy);border-radius:34px;padding:13px;background:#fff;box-shadow:12px 16px 0 #e4e8e1}.phone-top{display:flex;justify-content:space-between;padding:9px;font-size:10px}.ad-visual{height:155px;background:var(--coral);display:grid;place-items:center;position:relative;overflow:hidden}.ad-visual::after{content:"↗";font-size:150px;color:rgba(255,255,255,.2);position:absolute;transform:rotate(-10deg)}.ad-visual span{font-size:26px;color:#fff;font-weight:900;position:relative;z-index:1}.phone-preview pre{white-space:pre-wrap;font-family:inherit;font-size:12px;line-height:1.8;min-height:110px;padding:12px;margin:0}.phone-preview button{width:100%;height:42px;background:var(--navy);color:var(--lime);border:0;font-weight:900;cursor:pointer}
.copy-lab aside{background:var(--lime);padding:35px;transform:rotate(2deg);box-shadow:8px 8px 0 var(--navy)}.copy-lab aside>span{font-size:11px;font-weight:900}.copy-lab aside h3{font-size:34px;line-height:1.2;margin:15px 0}.copy-lab aside p{line-height:1.8;font-size:13px}
.article-zone{background:var(--cream)}.text-link{font-weight:900;border-bottom:2px solid var(--ink);padding-bottom:5px}.article-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.article-card{background:#fff;padding:27px;min-height:285px;border:1px solid #e0ddd5;display:flex;flex-direction:column;transition:.2s}.article-card:hover{transform:translateY(-6px);box-shadow:0 16px 30px rgba(22,35,38,.1)}.article-card>div{display:flex;justify-content:space-between;align-items:center}.article-card>div span{width:36px;height:36px;display:grid;place-items:center;background:var(--navy);color:var(--lime);font-weight:900}.article-card small{color:var(--muted)}.article-card h3{font-size:20px;line-height:1.55;margin:24px 0 10px}.article-card p{color:var(--muted);font-size:12px;line-height:1.75;margin:0}.article-card>b{margin-top:auto;font-size:12px}.article-card.tone-1>div span{background:var(--coral);color:#fff}.article-card.tone-2>div span{background:#f5ca42;color:var(--navy)}
.book-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}.book-card{border:1px solid var(--line);padding:13px;background:#fff;transition:.2s}.book-card:hover{transform:translateY(-7px);box-shadow:0 18px 40px rgba(19,41,47,.13)}.book-image{height:245px;position:relative;background:#eef0eb;overflow:hidden}.book-image img{object-fit:contain;padding:13px}.book-card>span{display:inline-block;background:var(--lime);font-size:10px;font-weight:900;padding:6px 9px;margin-top:15px}.book-card h3{font-size:16px;line-height:1.6;min-height:52px;margin:12px 4px}.book-card>div:last-child{border-top:1px solid var(--line);padding:15px 4px 5px;display:flex;justify-content:space-between}.book-card b{font-size:18px}.book-card em{font-size:11px;font-style:normal;font-weight:900;color:#557068}
.evidence{display:grid;grid-template-columns:.72fr 1.28fr;gap:60px;border-top:1px solid var(--line)}.evidence-grid{display:grid;grid-template-columns:1fr 1fr;border:1px solid var(--line)}.evidence-grid a{padding:27px;border-left:1px solid var(--line);border-bottom:1px solid var(--line)}.evidence-grid a:nth-child(even){border-left:0}.evidence-grid a:nth-last-child(-n+2){border-bottom:0}.evidence-grid strong{font-size:32px;color:#1e4b3a}.evidence-grid h3{font-size:14px}.evidence-grid p{font-size:11px;line-height:1.7;color:var(--muted)}.evidence-grid small{font-size:9px;color:#587166}
.final-cta{background:var(--coral);color:#fff;padding:90px 0;position:relative;overflow:hidden}.final-cta::after{content:"↗";position:absolute;left:5%;top:-80px;font-size:330px;color:rgba(255,255,255,.12);font-weight:900}.final-cta .shell{position:relative;z-index:1}.final-cta h2{font-size:clamp(42px,6vw,80px);line-height:1.12;letter-spacing:-.055em;margin:0 0 35px}.final-cta .primary{background:var(--navy);color:var(--lime)}.final-cta .ghost{border-color:#fff;background:transparent}.final-cta .shell>div{display:flex;gap:12px;flex-wrap:wrap}
.site-footer{background:#05141e;color:#fff;padding:60px 0}.footer-grid{display:grid;grid-template-columns:1fr 1fr;gap:60px}.footer-grid h2{font-size:32px;margin:0}.footer-grid p{color:#a1b0b9;line-height:1.8}.footer-grid a{color:var(--lime);font-weight:900}

/* article library and detail */
.library-hero{background:var(--navy);color:#fff;padding:80px 0 70px}.library-hero h1{font-size:clamp(44px,6vw,76px);letter-spacing:-.05em;line-height:1.08;margin:0}.library-hero p{color:#b9c6cd;max-width:650px;line-height:1.8}.search-box{margin-top:30px;display:flex;gap:10px;max-width:800px}.search-box input{flex:1;height:58px;background:#102b3b;border:1px solid #45606d;color:#fff;padding:0 18px;outline:none}.search-box input:focus{border-color:var(--lime)}.search-box span{display:grid;place-items:center;background:var(--lime);color:var(--navy);padding:0 24px;font-weight:900}
.filter-bar{display:flex;gap:8px;overflow:auto;padding:24px 0}.filter-bar button{border:1px solid var(--line);background:#fff;padding:10px 14px;white-space:nowrap;cursor:pointer}.filter-bar button.active{background:var(--navy);color:var(--lime);border-color:var(--navy)}.library-count{font-weight:900;margin-bottom:25px}.library-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;padding-bottom:90px}.library-card{border:1px solid var(--line);padding:24px;background:#fff;min-height:250px;display:flex;flex-direction:column}.library-card:hover{border-color:#698177}.library-card span{font-size:10px;color:#567068;font-weight:900}.library-card h2{font-size:19px;line-height:1.55}.library-card p{font-size:12px;line-height:1.7;color:var(--muted)}.library-card b{margin-top:auto;font-size:11px}
.article-hero{background:var(--navy);color:#fff;padding:68px 0}.article-hero .breadcrumbs{font-size:11px;color:#8fa2ad;margin-bottom:30px}.article-hero h1{font-size:clamp(38px,5.5vw,68px);line-height:1.18;letter-spacing:-.045em;margin:0;max-width:970px}.article-hero p{max-width:760px;color:#bdc9cf;line-height:1.85;font-size:17px}.article-meta{display:flex;gap:18px;flex-wrap:wrap;color:var(--lime);font-size:11px;font-weight:900;margin-top:25px}
.article-layout{display:grid;grid-template-columns:minmax(0,1fr) 310px;gap:60px;padding-block:60px 100px}.article-body{font-size:16px;line-height:2}.article-body h2{font-size:34px;line-height:1.35;margin:55px 0 17px}.article-body h3{font-size:22px;margin:35px 0 10px}.article-body p{color:#42515a}.article-body .lead{font-size:20px;color:var(--ink);border-right:5px solid var(--lime);padding-right:20px}.step-list{counter-reset:steps;list-style:none;padding:0}.step-list li{counter-increment:steps;border-bottom:1px solid var(--line);padding:20px 60px 20px 0;position:relative}.step-list li::before{content:counter(steps,decimal-leading-zero);position:absolute;right:0;top:18px;color:#2f6850;font-weight:900;font-size:12px}.budget-table{width:100%;border-collapse:collapse;margin:25px 0;font-size:13px}.budget-table th,.budget-table td{border:1px solid var(--line);padding:14px;text-align:right}.budget-table th{background:var(--navy);color:var(--lime)}.callout{background:#eff7e7;border:1px solid #cfe1bd;padding:23px;margin:30px 0}.callout strong{display:block;font-size:19px}.stat-cards{display:grid;grid-template-columns:1fr 1fr;gap:12px}.stat-card{border:1px solid var(--line);padding:20px}.stat-card strong{font-size:28px;color:#24503f;display:block}.stat-card span{font-weight:900;font-size:12px}.stat-card small{display:block;color:var(--muted);font-size:9px;line-height:1.6;margin-top:8px}
.article-sidebar{position:relative}.sticky-box{position:sticky;top:100px;border:1px solid var(--line);padding:23px}.sticky-box h3{font-size:19px}.sticky-box a{display:block;border-bottom:1px solid var(--line);padding:12px 0;font-size:12px;font-weight:900}.sticky-box .side-cta{background:var(--coral);color:#fff;border:0;padding:18px;margin-top:20px}.related-list{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}.related-list a{border:1px solid var(--line);padding:18px;font-weight:900;font-size:13px;line-height:1.6}

@media (max-width:1000px){.site-header nav{display:none}.nav-wrap{gap:16px}.platform-tabs{grid-template-columns:repeat(5,1fr)}.platform-panel{grid-template-columns:1fr 1fr}.platform-panel>ol{grid-column:1/-1}.calculator-grid,.copy-lab,.evidence,.article-layout{grid-template-columns:1fr}.article-grid,.library-grid{grid-template-columns:1fr 1fr}.book-grid{grid-template-columns:1fr 1fr}.article-sidebar{display:none}}
@media (max-width:700px){.shell{width:min(100% - 26px,1180px)}.site-header{height:66px}.brand{margin-left:auto}.nav-cta{font-size:0;padding:10px}.nav-cta span{font-size:18px}.hero{min-height:700px}.hero-content{min-height:630px;align-items:end}.hero>img{object-position:37% center}.hero-shade{background:linear-gradient(0deg,rgba(7,25,39,.98),rgba(7,25,39,.45) 75%,rgba(7,25,39,.2))}.hero-copy{padding-bottom:70px}.hero h1{font-size:48px}.hero-copy>p{font-size:16px}.trust-line{gap:10px}.signal-strip{overflow:auto}.stat-row{width:820px}.section{padding-block:70px}.section-head{display:block}.section-head>p{margin-top:15px}.section-head h2,.copy-inputs h2,.evidence h2{font-size:38px}.platform-tabs{grid-template-columns:repeat(5,1fr)}.platform-panel{grid-template-columns:1fr;box-shadow:7px 7px 0 var(--accent)}.platform-panel>div,.platform-panel>ol{padding:27px;border-left:0;border-bottom:1px solid #29404e}.result-board,.control-card{padding:24px}.result-hero strong{font-size:54px}.result-cells{grid-template-columns:1fr 1fr}.result-cells div:nth-child(2){border-left:0}.copy-lab{gap:35px}.copy-lab aside{transform:none}.article-grid,.library-grid,.book-grid,.stat-cards,.related-list{grid-template-columns:1fr}.article-card:nth-child(n+7){display:none}.book-image{height:320px}.evidence-grid{grid-template-columns:1fr}.evidence-grid a{border-left:0!important;border-bottom:1px solid var(--line)!important}.evidence-grid a:last-child{border-bottom:0!important}.footer-grid{grid-template-columns:1fr}.article-layout{padding-top:30px}.article-body h2{font-size:29px}.search-box{display:block}.search-box span{height:50px}.library-hero{padding-top:55px}}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}.ticker div{animation:none}}
.book-image img{width:100%;height:100%}.filter-bar a{border:1px solid var(--line);background:#fff;padding:10px 14px;white-space:nowrap;cursor:pointer}.filter-bar a.active{background:var(--navy);color:var(--lime);border-color:var(--navy)}.pagination{display:flex;justify-content:center;gap:8px;margin:-55px 0 75px}.pagination a{width:42px;height:42px;display:grid;place-items:center;border:1px solid var(--line)}.pagination a.active{background:var(--navy);color:var(--lime)}