:root{--bg:#f4f7fb;--card:#fff;--ink:#172033;--muted:#68758a;--line:#dce3ec;--nav:#10233d;--accent:#265d97;--accent2:#1f4c7d;--soft:#eaf2fb;--gold:#fff6d9;--ok:#e7f6ec;--warn:#fff4d9;--bad:#fdeaea;--shadow:0 6px 24px rgba(18,37,62,.08)}
*{box-sizing:border-box}
html{background:var(--bg)}
body{margin:0;font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",Arial,sans-serif;background:var(--bg);color:var(--ink);padding-bottom:92px}
button,input,textarea,select{font:inherit}
.topbar{background:var(--nav);color:#fff;padding:calc(16px + env(safe-area-inset-top)) 18px 15px;display:flex;align-items:flex-start;justify-content:space-between;gap:12px;position:sticky;top:0;z-index:20;box-shadow:0 2px 16px rgba(0,0,0,.16)}
.brand h1{font-size:22px;margin:2px 0 1px;line-height:1.15}.brand p{margin:3px 0 0;color:#c9d7e8;font-size:12px}.eyebrow{font-size:10px;text-transform:uppercase;letter-spacing:.08em;opacity:.8}
.install-btn{background:#fff;color:var(--nav);border:0;border-radius:10px;padding:8px 10px;font-size:12px;font-weight:800;white-space:nowrap}
main{max-width:1120px;margin:0 auto;padding:16px 14px 26px}.grid{display:grid;grid-template-columns:repeat(12,1fr);gap:14px}.span8{grid-column:span 8}.span4{grid-column:span 4}.span12{grid-column:span 12}
.card{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:16px;box-shadow:var(--shadow)}
.hero{padding:18px}.hero h2{font-size:24px;margin:7px 0 8px}.muted{color:var(--muted)}.tag{display:inline-flex;align-items:center;background:var(--soft);color:var(--accent);padding:6px 10px;border-radius:999px;font-size:11px;font-weight:800;letter-spacing:.02em}
.lesson-title{font-size:23px;margin:8px 0 10px;line-height:1.2}.section{margin:18px 0}.section h3{font-size:14px;margin:0 0 8px;color:#35475d}.say{font-size:17px;line-height:1.55;background:var(--gold);border-left:4px solid #d69c00;padding:13px 14px;border-radius:10px;white-space:pre-line}
ul,ol{padding-left:22px}li{margin:7px 0;line-height:1.45}.row{display:flex;gap:9px;flex-wrap:wrap;align-items:center}.stack{display:grid;gap:10px}
button,.btn{border:1px solid var(--line);background:#fff;color:#173653;padding:11px 14px;border-radius:12px;cursor:pointer;font-weight:800;text-decoration:none;display:inline-flex;align-items:center;justify-content:center;min-height:44px}.primary{background:var(--accent);border-color:var(--accent);color:#fff}.primary:hover{background:var(--accent2)}.share{background:#1f6f43;border-color:#1f6f43;color:#fff}.ghost{background:#f8fafc}
.sharebox{background:#f7f9fc;border:1px dashed #a9b6c6;padding:13px;border-radius:12px;white-space:pre-wrap;line-height:1.48;font-size:14px;max-height:320px;overflow:auto}.status{display:grid;grid-template-columns:1fr 1fr 1fr;gap:8px}.status button{width:100%;padding:12px 8px}.status button.active{outline:3px solid #7890aa;outline-offset:1px}.green{background:var(--ok)!important}.yellow{background:var(--warn)!important}.red{background:var(--bad)!important}
.progressbar{height:12px;background:#e7ecf2;border-radius:99px;overflow:hidden}.progressbar i{display:block;height:100%;background:var(--accent)}.metric{font-size:34px;font-weight:900}.milestone{padding:11px 0;border-bottom:1px solid var(--line)}
.lesson-list{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:10px}.lesson-item{padding:14px;border:1px solid var(--line);background:#fff;border-radius:14px;cursor:pointer}.lesson-item h3{margin:6px 0 4px;font-size:16px}.search{width:100%;padding:13px;border-radius:12px;border:1px solid var(--line);font-size:16px;background:#fff}.qa{width:100%;border-collapse:collapse;font-size:14px}.qa td,.qa th{border-bottom:1px solid var(--line);padding:10px 7px;text-align:left;vertical-align:top}.answer{background:#f6f8fb}
textarea,input,select{width:100%;padding:12px;border:1px solid var(--line);border-radius:11px;background:#fff;color:var(--ink)}label{display:block;font-weight:800;margin:11px 0 6px;font-size:13px}.hidden{display:none!important}details{border-radius:12px}summary{cursor:pointer;padding:4px 0}.mini{font-size:12px}.divider{height:1px;background:var(--line);margin:14px 0}.callout{background:#eef5fc;padding:12px;border-radius:12px;line-height:1.45}
.bottom-nav{position:fixed;z-index:30;bottom:0;left:0;right:0;background:rgba(255,255,255,.98);border-top:1px solid var(--line);display:grid;grid-template-columns:repeat(5,1fr);padding:6px max(6px,env(safe-area-inset-right)) calc(6px + env(safe-area-inset-bottom)) max(6px,env(safe-area-inset-left));box-shadow:0 -4px 18px rgba(16,35,61,.08)}.nav-item{border:0;background:transparent;min-height:56px;padding:5px 2px;border-radius:10px;display:flex;flex-direction:column;gap:2px;color:#6b7584;font-size:10px}.nav-item span{font-size:20px;line-height:1}.nav-item.active{background:var(--soft);color:var(--accent)}
.mobile-actionbar{position:sticky;bottom:72px;z-index:12;background:rgba(244,247,251,.95);backdrop-filter:blur(6px);padding:8px 0 2px}.mobile-actionbar .row{display:grid;grid-template-columns:1.4fr 1fr;gap:8px}.mobile-actionbar button{width:100%}
@media(max-width:820px){.span8,.span4,.span12{grid-column:span 12}.topbar{position:sticky}.brand h1{font-size:19px}.brand p{display:none}.eyebrow{font-size:9px}.lesson-title{font-size:21px}.hero h2{font-size:22px}.card{border-radius:15px;padding:14px}.say{font-size:16px}.qa,.qa tbody,.qa tr,.qa td,.qa th{display:block;width:100%}.qa th{display:none}.qa tr{border-bottom:1px solid var(--line);padding:8px 0}.qa td{border:0;padding:6px 0}.qa td:first-child:before{content:'Ask her';display:block;font-size:11px;font-weight:800;color:var(--muted);text-transform:uppercase}.qa td.answer:before{content:'Answer for Dad';display:block;font-size:11px;font-weight:800;color:var(--muted);text-transform:uppercase}.qa td.answer{padding:9px;border-radius:9px}.lesson-list{grid-template-columns:1fr}.desktop-only{display:none!important}}
@media(min-width:821px){body{padding-bottom:92px}.bottom-nav{max-width:720px;left:50%;transform:translateX(-50%);border:1px solid var(--line);border-bottom:0;border-radius:16px 16px 0 0}.mobile-actionbar{position:static;background:transparent;padding:0}.mobile-actionbar .row{display:flex}}