/* WalkCare AI landing — quiet, product-first layout: generous white space,
   one accent colour, large tight headlines, soft grey panels. Body text stays
   large (18px+) for readers in their 40s-70s. */
:root{
  --ink:#1d1d1f; --soft:#515154; --mute:#6e6e73;
  --bg:#fff; --panel:#f5f5f7; --line:#d2d2d7;
  --accent:#0066cc; --accent-h:#0055ad;
  --good:#1a7f37; --warn:#b25000; --mint:#30d158;
  --r:28px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:64px}
body{margin:0;background:var(--bg);color:var(--ink);
  font-family:-apple-system,BlinkMacSystemFont,"Pretendard","Apple SD Gothic Neo","Noto Sans KR","Malgun Gothic",system-ui,sans-serif;
  font-size:19px;line-height:1.6;letter-spacing:-.01em;word-break:keep-all;
  -webkit-font-smoothing:antialiased;-webkit-text-size-adjust:100%}
svg{max-width:100%}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3{margin:0;font-weight:700;letter-spacing:-.03em;text-wrap:balance}
h1{font-size:clamp(40px,7.4vw,84px);line-height:1.08}
h1 em{font-style:normal;color:var(--accent)}
h2{font-size:clamp(30px,4.8vw,54px);line-height:1.12;text-align:center}
h3{font-size:23px;line-height:1.3;letter-spacing:-.02em}
.h3-lg{font-size:28px;margin:1.4em 0 .4em}
.h3-lg:first-child{margin-top:0}
p{margin:0 0 1em}
.wrap{max-width:1080px;margin:0 auto;padding:0 22px}
.narrow{max-width:780px}
.eyebrow{font-size:19px;font-weight:600;color:var(--accent);margin:0 0 14px}
.sub{font-size:clamp(19px,2.2vw,24px);line-height:1.5;color:var(--mute);max-width:760px;margin:18px auto 0;text-align:center}
.fine{font-size:16px;color:var(--mute);line-height:1.55}

/* nav */
.nav{position:sticky;top:0;z-index:10;background:rgba(255,255,255,.8);
  -webkit-backdrop-filter:saturate(180%) blur(20px);backdrop-filter:saturate(180%) blur(20px);
  border-bottom:1px solid rgba(0,0,0,.08)}
.nav-in{display:flex;align-items:center;gap:28px;height:56px}
.brand{display:flex;align-items:center;gap:9px;font-weight:700;font-size:20px;color:var(--ink);letter-spacing:-.02em}
.brand:hover{text-decoration:none}
.brand svg{width:28px;height:28px}
.brand rect{fill:var(--ink)}
.nav-links{display:flex;gap:30px;margin-left:auto}
.nav-links a{color:var(--ink);font-size:16px;opacity:.86}
.nav-links a:hover{opacity:1;text-decoration:none}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;min-height:52px;padding:0 26px;border-radius:980px;
  background:var(--accent);color:#fff;font:inherit;font-weight:500;font-size:19px;border:1.5px solid var(--accent);cursor:pointer;
  transition:background .2s,border-color .2s}
.btn:hover{background:var(--accent-h);border-color:var(--accent-h);text-decoration:none}
.btn:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,summary:focus-visible{outline:3px solid rgba(0,102,204,.5);outline-offset:3px}
.btn-sm{min-height:40px;padding:0 18px;font-size:16px}
.btn-lg{min-height:60px;padding:0 34px;font-size:20px}
.btn-ghost{background:transparent;color:var(--accent)}
.btn-ghost:hover{background:var(--accent);color:#fff}

/* hero */
.hero{padding:88px 0 0;text-align:center;overflow:hidden}
.hero-in{display:flex;flex-direction:column;align-items:center}
.lead{font-size:clamp(20px,2.4vw,26px);line-height:1.45;color:var(--mute);max-width:720px;margin:22px auto 0}
.hero .ticks{display:flex;flex-wrap:wrap;justify-content:center;gap:8px 28px;margin:26px 0 0}
.ticks{list-style:none;padding:0;margin:0}
.ticks li{position:relative;padding-left:28px;margin:.4em 0;color:var(--soft)}
.ticks li::before{content:"";position:absolute;left:2px;top:.42em;width:13px;height:7px;border-left:2.5px solid var(--good);border-bottom:2.5px solid var(--good);transform:rotate(-45deg)}
.cta-row{display:flex;flex-wrap:wrap;justify-content:center;gap:14px;margin-top:34px}
.store-note{margin:16px 0 0;color:var(--mute);font-size:17px}

.phone{margin:64px auto -70px;width:min(300px,72vw);aspect-ratio:9/18.5;background:#1d1d1f;border-radius:48px;padding:11px;
  box-shadow:0 40px 80px -20px rgba(0,0,0,.35),0 0 0 1px rgba(0,0,0,.6)}
.phone-screen{position:relative;height:100%;border-radius:38px;background:linear-gradient(180deg,#3a3a3c,#1c1c1e);overflow:hidden;
  display:flex;flex-direction:column;align-items:center;justify-content:center}
.phone-screen::after{content:"";position:absolute;inset:58px 14px 96px;border:3px solid var(--mint);border-radius:22px;opacity:.9}
.phone-banner{position:absolute;top:14px;left:14px;right:14px;background:rgba(0,0,0,.6);color:#fff;font-size:14px;font-weight:600;padding:9px 12px;border-radius:14px;text-align:left}
.walker{width:62%;margin-top:6px}
.phone-count{position:absolute;bottom:20px;width:60px;height:60px;border-radius:50%;background:rgba(255,255,255,.16);
  -webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);color:#fff;font-size:30px;font-weight:700;display:grid;place-items:center}
@media (prefers-reduced-motion:no-preference){
  .leg-a{animation:swing 1.2s ease-in-out infinite alternate;transform-origin:98px 140px}
  .leg-b{animation:swing 1.2s ease-in-out infinite alternate-reverse;transform-origin:98px 140px}
  @keyframes swing{from{transform:rotate(-7deg)}to{transform:rotate(7deg)}}
}

/* sections */
.section{padding:120px 0}
.band{padding:120px 0;background:var(--panel)}
.hero + .band{padding-top:170px}
.grid4,.grid3,.grid2{display:grid;gap:20px;margin-top:56px}
.grid4{grid-template-columns:repeat(4,1fr)}
.grid3{grid-template-columns:repeat(3,1fr)}
.grid2{grid-template-columns:repeat(2,1fr)}
.card{background:var(--bg);border-radius:var(--r);padding:32px 28px}
.section .card{background:var(--panel)}
.card h3{margin-bottom:10px}
.card p{margin:0;color:var(--mute);font-size:18px;line-height:1.55}
.card .num{display:block;font-size:17px;font-weight:600;color:var(--accent);margin-bottom:14px}
.card-hi{outline:2px solid var(--accent);outline-offset:-2px}
.amount{font-size:40px!important;font-weight:700;letter-spacing:-.03em;color:var(--ink)!important;margin:6px 0 18px!important;line-height:1.15!important}
.amount small{display:inline-block;font-size:16px;font-weight:600;letter-spacing:0;color:var(--good);background:rgba(26,127,55,.1);padding:4px 12px;border-radius:980px;margin-left:8px;vertical-align:middle}
.price{max-width:860px;margin-left:auto;margin-right:auto}
.price .card{padding:40px 36px}
.price .fine{margin-top:16px}

.steps{list-style:none;padding:0;margin:56px 0 0;display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.steps li{background:var(--panel);border-radius:var(--r);padding:32px 28px}
.steps h3{margin-bottom:10px}
.steps p{margin:0;color:var(--mute);font-size:18px}
.step-n{display:block;font-size:56px;font-weight:700;letter-spacing:-.04em;line-height:1;color:var(--accent);margin-bottom:22px}

.split{display:grid;grid-template-columns:1fr 1fr;gap:64px;align-items:center;margin-top:110px}
.split p{color:var(--mute)}
.report{border-radius:var(--r);background:#fff;padding:0 0 22px;box-shadow:0 30px 60px -20px rgba(0,0,0,.22),0 0 0 1px rgba(0,0,0,.06);overflow:hidden}
.report-head{font-weight:600;font-size:17px;padding:20px 26px 0;color:var(--mute)}
.report-score{display:flex;align-items:baseline;gap:10px;padding:4px 26px 10px}
.report-score b{font-size:84px;line-height:1;letter-spacing:-.04em;color:var(--ink)}
.report-score span{font-weight:600;font-size:17px;line-height:1.35;color:var(--soft)}
.bar{height:8px;border-radius:4px;background:#e8e8ed;margin:18px 26px 8px;overflow:hidden}
.bar i{display:block;height:100%;background:var(--accent);border-radius:4px}
.bar-l{margin:0 26px;font-size:16px;font-weight:500;color:var(--ink)!important}
.up{color:var(--good)}.same{color:var(--mute)}
.report-note{margin:18px 26px 0;font-size:14px}

/* faq */
.faq{padding-top:0}
.faq h2{margin-bottom:36px}
details{border-top:1px solid var(--line)}
details:last-child{border-bottom:1px solid var(--line)}
summary{cursor:pointer;font-weight:600;font-size:21px;padding:24px 40px 24px 0;list-style:none;position:relative;letter-spacing:-.02em}
summary::-webkit-details-marker{display:none}
summary::after{content:"";position:absolute;right:8px;top:50%;width:11px;height:11px;border-right:2px solid var(--mute);border-bottom:2px solid var(--mute);transform:translateY(-70%) rotate(45deg);transition:transform .2s}
details[open] summary::after{transform:translateY(-30%) rotate(-135deg)}
details p{color:var(--mute);padding:0 40px 24px 0;margin:0}

/* b2b */
.b2b{background:#000;color:#f5f5f7;padding:130px 0}
.b2b h2{color:#f5f5f7}
.b2b .eyebrow{text-align:center;color:#2997ff}
.b2b .sub{color:#a1a1a6}
.card.dark{background:#1d1d1f}
.card.dark h3{color:#f5f5f7}
.card.dark p{color:#a1a1a6}
.b2b-split{align-items:start;margin-top:90px}
.plans h3{color:#f5f5f7}
.plans table{width:100%;border-collapse:collapse;color:#f5f5f7;font-size:18px;margin:8px 0 22px}
.plans th{font-size:15px;font-weight:500;color:#86868b;text-align:left;padding:10px 8px;border-bottom:1px solid #424245}
.plans td{border-bottom:1px solid #424245;padding:18px 8px;text-align:left;vertical-align:top;color:#d2d2d7}
.plans td:first-child{color:#f5f5f7;font-weight:600;white-space:nowrap}
.plans td:nth-child(2){white-space:nowrap;font-weight:700;color:#f5f5f7}
.b2b .fine{color:#86868b}
.form{background:#fff;color:var(--ink);border-radius:var(--r);padding:36px;display:grid;gap:16px}
.form h3{font-size:26px;margin-bottom:4px}
.form label{display:grid;gap:7px;font-weight:500;font-size:16px;color:var(--soft)}
.form label b{color:var(--warn);font-weight:500}
.form input:not([type=checkbox]),.form select,.form textarea{font:inherit;font-size:18px;padding:14px 16px;border:1px solid var(--line);border-radius:14px;width:100%;background:#fff;color:var(--ink);transition:border-color .15s,box-shadow .15s}
.form input:not([type=checkbox]):focus,.form select:focus,.form textarea:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 4px rgba(0,102,204,.18)}
.form .check{grid-template-columns:26px 1fr;align-items:start;font-size:15px;line-height:1.5;color:var(--mute)}
.form .check input{width:20px;height:20px;margin-top:2px;accent-color:var(--accent)}
.form .hp{position:absolute;left:-9999px;width:1px;height:1px;opacity:0}
.form .btn{margin-top:6px;width:100%}
.form-msg{margin:0;font-weight:600;font-size:16px;min-height:1.6em;text-align:center}
.form-msg.ok{color:var(--good)}.form-msg.err{color:var(--warn)}
.form [aria-invalid=true]{border-color:var(--warn)!important}

/* footer */
.footer{background:var(--panel);color:var(--mute);padding:36px 0 44px;font-size:14px;line-height:1.6}
.footer p{margin:0 0 12px}
.footer a{color:var(--soft)}
.disclaimer{font-size:14px;color:var(--mute);padding-bottom:16px;border-bottom:1px solid var(--line)}
.biz{margin:.3em 0}

@media (max-width:900px){
  .nav-links{display:none}.nav .btn-sm{margin-left:auto}
  .hero{padding-top:56px}
  .split{grid-template-columns:1fr;gap:44px;margin-top:72px}
  .grid4{grid-template-columns:repeat(2,1fr)}
  .grid3,.steps{grid-template-columns:1fr}
  .section,.band{padding:80px 0}.hero + .band{padding-top:140px}.b2b{padding:84px 0}
  .grid4,.grid3,.grid2,.steps{margin-top:40px}
}
@media (max-width:560px){
  body{font-size:18px}
  .wrap{padding:0 16px}
  .grid4,.grid2{grid-template-columns:1fr}
  .hero .ticks{flex-direction:column;align-items:center;gap:0}
  .cta-row{width:100%}.cta-row .btn{width:100%}
  .card,.steps li{padding:26px 22px}
  .form{padding:24px 20px}
  .plans table{font-size:16px}
  .report-score b{font-size:68px}
}