/* serpdental.com/book · The AI Patient Engine funnel · shared styles (built by Claude, Nov 2026) */
:root{--navy:#003251;--navy2:#0B2F45;--cyan:#3EC7E3;--blue:#0068A7;--ink:#1d2b36;--muted:#5b6b78;--rule:#d6dee5;--tint:#EFF5F8;--paper:#fff;--max:1120px;--r:14px;--shadow:0 18px 50px rgba(0,50,81,.14)}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;font-family:"Albert Sans",system-ui,-apple-system,Segoe UI,Roboto,sans-serif;color:var(--ink);background:var(--paper);line-height:1.55;font-size:17px}
img{max-width:100%;height:auto;display:block}
a{color:var(--blue)}
h1,h2,h3,h4{font-family:"Albert Sans",sans-serif;font-weight:800;line-height:1.08;letter-spacing:-.015em;margin:0 0 .5em;color:var(--navy)}
h1{font-size:clamp(2.3rem,5.2vw,4rem)}
h2{font-size:clamp(1.8rem,3.6vw,2.7rem)}
h3{font-size:1.25rem;line-height:1.25}
p{margin:0 0 1em}
.eyebrow{font-family:"Montserrat",sans-serif;font-weight:700;font-size:.78rem;letter-spacing:.22em;text-transform:uppercase;color:var(--cyan);margin:0 0 14px}
.wrap{max-width:var(--max);margin:0 auto;padding:0 20px}
.narrow{max-width:760px}
section{padding:72px 0}
@media (max-width:720px){section{padding:52px 0}}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;background:var(--cyan);color:var(--navy);font-weight:800;font-size:1.05rem;padding:17px 30px;border-radius:999px;text-decoration:none;border:0;cursor:pointer;transition:transform .15s,box-shadow .15s,background .15s;box-shadow:0 10px 24px rgba(62,199,227,.35);font-family:inherit}
.btn:hover{transform:translateY(-2px);background:#5ad3ea}
.btn:active{transform:translateY(0)}
.btn.navy{background:var(--navy);color:#fff;box-shadow:0 10px 24px rgba(0,50,81,.25)}
.btn.navy:hover{background:#0a4a72}
.btn.ghost{background:transparent;color:#fff;border:2px solid rgba(255,255,255,.55);box-shadow:none}
.btn.ghost:hover{background:rgba(255,255,255,.1)}
.btn[disabled]{opacity:.6;cursor:wait;transform:none}
.btn.lg{font-size:1.15rem;padding:20px 38px}
.btn.full{width:100%}
.fine{font-size:.86rem;color:var(--muted)}
.center{text-align:center}
.topbar{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);backdrop-filter:saturate(1.4) blur(10px);border-bottom:1px solid var(--rule)}
.topbar .wrap{display:flex;align-items:center;justify-content:space-between;height:68px}
.topbar img{height:34px;width:auto}
.topbar .tag{font-family:"Montserrat",sans-serif;font-weight:700;font-size:.72rem;letter-spacing:.18em;text-transform:uppercase;color:var(--navy);background:var(--tint);padding:8px 14px;border-radius:999px;white-space:nowrap}
.topbar .btn{padding:11px 20px;font-size:.95rem}
@media (max-width:640px){.topbar .tag{display:none}}
/* hero */
.hero{background:radial-gradient(1200px 600px at 85% 10%,#0a4a72 0%,var(--navy) 55%,#021f33 100%);color:#fff;padding:64px 0 40px;position:relative;overflow:hidden}
.hero::after{content:"";position:absolute;inset:auto -10% -40% -10%;height:60%;background:radial-gradient(closest-side,rgba(62,199,227,.18),transparent 70%);pointer-events:none}
.hero .wrap{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center;position:relative}
.hero h1{color:#fff;margin-bottom:.35em}
.hero h1 span{color:var(--cyan)}
.hero .lead{font-size:clamp(1.1rem,1.9vw,1.35rem);color:#d9e8f0;max-width:34em;margin-bottom:1.2em}
.hero ul{list-style:none;margin:0 0 1.6em;padding:0;display:grid;gap:10px}
.hero li{padding-left:34px;position:relative;color:#e9f3f8;font-size:1.02rem}
.hero li::before{content:"";position:absolute;left:0;top:4px;width:22px;height:22px;border-radius:50%;background:var(--cyan);-webkit-mask:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'><path fill='black' d='M12 2a10 10 0 100 20 10 10 0 000-20zm-1.2 14.6l-4-4 1.6-1.6 2.4 2.4 5.6-5.6 1.6 1.6z'/></svg>") center/contain no-repeat;mask:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'><path fill='black' d='M12 2a10 10 0 100 20 10 10 0 000-20zm-1.2 14.6l-4-4 1.6-1.6 2.4 2.4 5.6-5.6 1.6 1.6z'/></svg>") center/contain no-repeat}
.hero .book{justify-self:center;width:min(100%,440px);filter:drop-shadow(0 30px 40px rgba(0,0,0,.45))}
.hero .cta-row{display:flex;flex-wrap:wrap;gap:14px;align-items:center}
.hero .fine{color:#9fc0d2}
@media (max-width:860px){.hero .wrap{grid-template-columns:minmax(0,1fr);text-align:center}.hero ul{text-align:left;max-width:30em;margin-left:auto;margin-right:auto}.hero .lead{margin-left:auto;margin-right:auto}.hero .cta-row{justify-content:center}.hero .book{width:min(72%,340px);order:-1}}
/* credibility strip */
.strip{background:#021f33;color:#9fc0d2;padding:18px 0;border-top:1px solid rgba(255,255,255,.08)}
.strip .wrap{display:flex;flex-wrap:wrap;justify-content:center;gap:10px 34px;font-family:"Montserrat",sans-serif;font-size:.74rem;letter-spacing:.14em;text-transform:uppercase;font-weight:700;text-align:center}
.strip b{color:#fff}
/* cards & grids */
.grid{display:grid;gap:22px}
.g2{grid-template-columns:repeat(2,minmax(0,1fr))}.g3{grid-template-columns:repeat(3,minmax(0,1fr))}.g5{grid-template-columns:repeat(5,minmax(0,1fr))}
@media (max-width:900px){.g3,.g5{grid-template-columns:repeat(2,1fr)}}
@media (max-width:600px){.g2,.g3,.g5{grid-template-columns:minmax(0,1fr)}}
.card{background:#fff;border:1px solid var(--rule);border-radius:var(--r);padding:26px;box-shadow:0 6px 22px rgba(0,50,81,.06)}
.card .letter{font-size:2.6rem;font-weight:800;color:var(--cyan);line-height:1;margin-bottom:8px}
.card h3{margin-bottom:.35em}
.card p{margin:0;color:var(--muted);font-size:.98rem}
.tinted{background:var(--tint)}
.dark{background:var(--navy);color:#fff}
.dark h2,.dark h3{color:#fff}
.dark p{color:#d9e8f0}
.quote{background:#fff;border-left:4px solid var(--cyan);border-radius:10px;padding:22px 24px;font-size:1.08rem;color:var(--navy2);font-style:italic;box-shadow:0 6px 22px rgba(0,50,81,.06)}
.quote::before{content:"\201C";font-size:2.6rem;line-height:0;color:var(--cyan);vertical-align:-.45em;margin-right:4px;font-style:normal}
/* chapters */
.parts{columns:2;column-gap:40px}
@media (max-width:760px){.parts{columns:1}}
.part{break-inside:avoid;margin-bottom:26px}
.part .eyebrow{margin-bottom:8px;color:var(--blue)}
.part ol{margin:0;padding-left:1.4em;color:var(--ink)}
.part li{margin:0 0 6px;font-weight:600;color:var(--navy2)}
.part li::marker{color:var(--cyan);font-weight:800}
/* sample pages */
.pages{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.pages figure{margin:0;background:#fff;border:1px solid var(--rule);border-radius:12px;overflow:hidden;box-shadow:0 10px 30px rgba(0,50,81,.08);transform:rotate(-.6deg)}
.pages figure:nth-child(2n){transform:rotate(.7deg)}
.pages figure img{aspect-ratio:16/9;object-fit:cover;object-position:top;width:100%}
.pages figcaption{font-size:.82rem;color:var(--muted);padding:10px 14px;border-top:1px solid var(--rule)}
@media (max-width:760px){.pages{grid-template-columns:1fr 1fr}}
@media (max-width:480px){.pages{grid-template-columns:1fr}}
/* author */
.author .wrap{display:grid;grid-template-columns:.9fr 1.1fr;gap:48px;align-items:center}
.author img{border-radius:18px;box-shadow:var(--shadow);width:100%}
.author .creds{display:flex;flex-wrap:wrap;gap:10px;margin:18px 0 0}
.author .creds span{background:var(--tint);color:var(--navy);font-weight:700;font-size:.86rem;padding:8px 14px;border-radius:999px}
@media (max-width:860px){.author .wrap{grid-template-columns:minmax(0,1fr)}.author img{max-width:420px;margin:0 auto}}
/* video */
.videos{display:grid;grid-template-columns:1fr 1fr;gap:28px}
@media (max-width:800px){.videos{grid-template-columns:minmax(0,1fr)}}
.yt{position:relative;aspect-ratio:16/9;border-radius:14px;overflow:hidden;background:#000 center/cover no-repeat;cursor:pointer;box-shadow:var(--shadow)}
.yt iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.yt .play{position:absolute;inset:0;display:grid;place-items:center}
.yt .play span{width:74px;height:52px;border-radius:14px;background:rgba(0,50,81,.85);display:grid;place-items:center;transition:background .15s}
.yt:hover .play span{background:var(--cyan)}
.yt .play svg{width:26px;height:26px;fill:#fff;margin-left:4px}
.yt:hover .play svg{fill:var(--navy)}
.vcap{margin-top:12px}
.vcap b{display:block;color:var(--navy);font-size:1.05rem}
.vcap span{color:var(--muted);font-size:.92rem}
/* final cta */
.final .wrap{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center}
.final img{width:min(100%,520px);justify-self:center}
@media (max-width:860px){.final .wrap{grid-template-columns:minmax(0,1fr);text-align:center}.final img{width:min(80%,360px)}}
/* footer */
footer{background:#021f33;color:#9fc0d2;padding:44px 0 28px;font-size:.9rem}
footer .wrap{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:30px}
footer img{height:38px;width:auto;margin-bottom:14px}
footer a{color:#cfe3ee;text-decoration:none}
footer a:hover{color:var(--cyan)}
footer ul{list-style:none;margin:0;padding:0;display:grid;gap:8px}
footer .legal{grid-column:1/-1;border-top:1px solid rgba(255,255,255,.1);padding-top:18px;margin-top:10px;font-size:.8rem;display:flex;flex-wrap:wrap;gap:8px 20px;justify-content:space-between}
@media (max-width:760px){footer .wrap{grid-template-columns:1fr}}
/* modal + forms */
.modal{position:fixed;inset:0;z-index:100;display:none;align-items:center;justify-content:center;padding:16px;background:rgba(2,31,51,.72);backdrop-filter:blur(4px)}
.modal.open{display:flex}
.modal .box{background:#fff;border-radius:18px;width:min(100%,520px);max-height:calc(100vh - 32px);overflow:auto;padding:32px 30px 26px;position:relative;box-shadow:0 30px 80px rgba(0,0,0,.4);animation:pop .22s ease-out}
@keyframes pop{from{transform:translateY(14px) scale(.98);opacity:0}to{transform:none;opacity:1}}
.modal .x{position:absolute;top:12px;right:12px;width:40px;height:40px;border:0;background:var(--tint);border-radius:50%;font-size:22px;line-height:1;cursor:pointer;color:var(--navy)}
.modal h3{font-size:1.55rem;margin-bottom:.3em}
.modal .sub{color:var(--muted);margin-bottom:18px}
.field{margin-bottom:14px}
.row2{display:grid;grid-template-columns:1fr 1fr;gap:12px}
@media (max-width:420px){.row2{grid-template-columns:1fr}}
label{display:block;font-weight:700;font-size:.86rem;color:var(--navy);margin-bottom:6px}
input[type=text],input[type=email],input[type=tel],input[type=url]{width:100%;font:inherit;font-size:1rem;padding:14px 16px;border:1.5px solid var(--rule);border-radius:10px;color:var(--ink);background:#fff;transition:border-color .15s,box-shadow .15s}
input:focus{outline:0;border-color:var(--cyan);box-shadow:0 0 0 4px rgba(62,199,227,.25)}
input.bad{border-color:#d33}
.hp{position:absolute;left:-9999px;top:-9999px;height:0;width:0;opacity:0}
.err{display:none;color:#b3261e;font-size:.9rem;margin:-6px 0 12px}
.err.show{display:block}
.consent{font-size:.78rem;color:var(--muted);margin-top:12px;line-height:1.45}
/* questions page */
.qwrap{max-width:720px;margin:0 auto;padding:40px 20px 80px}
.progress{height:6px;background:var(--rule);border-radius:99px;overflow:hidden;margin:18px 0 34px}
.progress i{display:block;height:100%;background:linear-gradient(90deg,var(--blue),var(--cyan));width:0;transition:width .35s}
.step{display:none;animation:fade .25s ease-out}
.step.on{display:block}
@keyframes fade{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
.step h2{font-size:clamp(1.5rem,3vw,2.1rem);margin-bottom:.4em}
.step .hint{color:var(--muted);margin-bottom:22px}
.opts{display:grid;gap:12px}
.opt{display:flex;align-items:center;gap:14px;width:100%;text-align:left;font:inherit;font-size:1.05rem;font-weight:600;color:var(--navy2);background:#fff;border:1.5px solid var(--rule);border-radius:12px;padding:16px 18px;cursor:pointer;transition:border-color .15s,background .15s,transform .1s}
.opt:hover{border-color:var(--cyan);background:#f3fbfd}
.opt.sel{border-color:var(--blue);background:#eaf6fb;box-shadow:0 0 0 3px rgba(62,199,227,.25)}
.opt .k{width:28px;height:28px;border-radius:8px;background:var(--tint);color:var(--navy);font-size:.8rem;font-weight:800;display:grid;place-items:center;flex:none;font-family:"Montserrat",sans-serif}
.opt.sel .k{background:var(--blue);color:#fff}
.nav{display:flex;justify-content:space-between;align-items:center;margin-top:26px;gap:12px}
.linkbtn{background:none;border:0;color:var(--muted);font:inherit;cursor:pointer;text-decoration:underline;padding:8px 0}
.linkbtn:hover{color:var(--navy)}
.qhead{display:flex;align-items:center;justify-content:space-between;gap:16px}
.qhead img{height:34px;width:auto}
.qhead .pill{font-family:"Montserrat",sans-serif;font-size:.72rem;letter-spacing:.16em;text-transform:uppercase;font-weight:700;color:var(--blue)}
/* schedule page */
.cal{background:#fff;border-radius:18px;box-shadow:var(--shadow);padding:10px;min-height:720px}
.cal iframe{width:100%;border:0;min-height:700px}
.checks{list-style:none;padding:0;margin:0 0 24px;display:grid;gap:12px}
.checks li{padding-left:36px;position:relative;font-size:1.04rem}
.checks li::before{content:"";position:absolute;left:0;top:3px;width:24px;height:24px;border-radius:50%;background:var(--cyan);-webkit-mask:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'><path fill='black' d='M12 2a10 10 0 100 20 10 10 0 000-20zm-1.2 14.6l-4-4 1.6-1.6 2.4 2.4 5.6-5.6 1.6 1.6z'/></svg>") center/contain no-repeat;mask:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'><path fill='black' d='M12 2a10 10 0 100 20 10 10 0 000-20zm-1.2 14.6l-4-4 1.6-1.6 2.4 2.4 5.6-5.6 1.6 1.6z'/></svg>") center/contain no-repeat}
.split{display:grid;grid-template-columns:.9fr 1.1fr;gap:40px;align-items:start}
@media (max-width:900px){.split{grid-template-columns:minmax(0,1fr)}}
.notice{background:var(--tint);border-radius:12px;padding:16px 18px;font-size:.95rem;color:var(--navy2);display:flex;gap:12px;align-items:flex-start}
.notice b{color:var(--navy)}
.stat{text-align:center}
.stat b{display:block;font-size:2.6rem;font-weight:800;color:var(--cyan);line-height:1}
.stat span{color:#d9e8f0;font-size:.95rem}
.toast{position:fixed;left:50%;bottom:24px;transform:translateX(-50%);background:var(--navy);color:#fff;padding:14px 22px;border-radius:999px;box-shadow:0 10px 30px rgba(0,0,0,.3);font-weight:600;display:none;z-index:200}
.toast.show{display:block}