:root{--ink:#1f1f1f;--ink2:#404040;--mut:#636363;--soft:#9e9e9e;--bg:#fff;--gray:#f5f5f5;--line:#dbdee1;--r:24px;--w:1200px}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:80px}
body{margin:0;font:400 17px/1.55 Roboto,Arial,sans-serif;color:var(--ink);background:var(--bg);-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto;display:block}
a{color:inherit}
h1,h2,h3{margin:0;font-weight:500;line-height:1.15}
h2{font-size:clamp(30px,4.2vw,52px);margin-bottom:40px}
h3{font-size:22px;margin-bottom:14px}
p{margin:0 0 14px}
.wrap{max-width:var(--w);margin:0 auto;padding:0 20px}
section{padding:88px 0}
.gray{background:var(--gray)}.dark{background:var(--ink);color:#fff}
:focus-visible{outline:2px solid #000;outline-offset:3px}.dark :focus-visible{outline-color:#fff}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:48px;padding:0 28px;border-radius:30px;border:1px solid var(--ink);background:var(--ink);color:#fff;font:500 15px Roboto,Arial,sans-serif;text-decoration:none;cursor:pointer;transition:background .2s,color .2s,transform .2s}
.btn:hover{background:#fff;color:var(--ink)}.btn:active{transform:scale(.98)}
.btn--ghost{background:transparent;color:var(--ink)}.btn--ghost:hover{background:var(--ink);color:#fff}
.dark .btn{background:#fff;color:var(--ink);border-color:#fff}.dark .btn:hover{background:transparent;color:#fff}

/* header */
.hdr{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.hdr .wrap{display:flex;align-items:center;gap:24px;height:68px}
.logo{font-weight:500;font-size:19px;letter-spacing:.06em;text-transform:uppercase;text-decoration:none;margin-right:auto}
.nav{display:flex;gap:22px}.nav a{text-decoration:none;font-size:15px;color:var(--ink2)}.nav a:hover{color:#000;text-decoration:underline}
.hdr .btn{min-height:40px;padding:0 20px;font-size:14px}
.burger{display:none;width:44px;height:44px;border:0;background:none;cursor:pointer;padding:10px}
.burger span{display:block;height:2px;background:var(--ink);margin:6px 0;transition:.25s}
@media(max-width:960px){
 .nav{position:fixed;inset:68px 0 auto;flex-direction:column;gap:0;background:#fff;border-bottom:1px solid var(--line);padding:8px 20px 20px;transform:translateY(-120%);transition:transform .3s;z-index:-1}
 .nav a{padding:12px 0;font-size:17px;border-bottom:1px solid var(--gray)}
 .nav.open{transform:none}
 .burger{display:block}.hdr .btn--ghost{display:none}
}
@media(max-width:520px){.hdr .btn:not(.btn--ghost){display:none}}

/* hero */
.hero{padding:0;position:relative;min-height:min(88vh,820px);display:flex;align-items:flex-end;color:#fff;background:#1f1f1f}
.hero img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;object-position:60% 30%}
.hero::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(0,0,0,.72) 0%,rgba(0,0,0,.35) 50%,rgba(0,0,0,0) 80%)}
.hero .wrap{position:relative;z-index:1;width:100%;padding-top:120px;padding-bottom:72px}
.hero small{display:block;font-size:16px;letter-spacing:.1em;text-transform:uppercase;opacity:.85;margin-bottom:10px}
.hero h1{font-size:clamp(48px,8vw,104px);margin-bottom:22px}
.hero p{max-width:480px;font-size:19px;font-weight:300;margin-bottom:32px}

/* cards */
.grid{display:grid;gap:20px}
.g2{grid-template-columns:repeat(2,1fr)}.g3{grid-template-columns:repeat(3,1fr)}.g4{grid-template-columns:repeat(4,1fr)}
@media(max-width:960px){.g3,.g4{grid-template-columns:1fr 1fr}}
@media(max-width:640px){.g2,.g3,.g4{grid-template-columns:1fr}section{padding:60px 0}h2{margin-bottom:28px}}
.card{background:#fff;border-radius:var(--r);padding:36px}
.gray .card{background:#fff}.card--g{background:var(--gray)}
.card p{color:var(--ink2);font-size:16px}.card p:last-child{margin:0}
.card b{color:var(--ink);font-weight:500}
.card--dark{background:var(--ink);color:#fff;display:flex;flex-direction:column}
.card--dark p{color:#d2d2d2}
.num{margin-top:auto;padding-top:20px}
.num span{display:inline-grid;place-items:center;width:44px;height:44px;border:1px solid #888;border-radius:50%;font-size:15px}

/* problems */
.probs{display:grid;grid-template-columns:repeat(3,1fr);border-top:1px solid #3a3a3a}
.probs li{list-style:none;padding:34px 20px;text-align:center;border-bottom:1px solid #3a3a3a;border-right:1px solid #3a3a3a;font-size:16px}
.probs li:nth-child(3n){border-right:0}
@media(max-width:640px){.probs{grid-template-columns:1fr}.probs li{border-right:0;padding:20px}}
ul.probs{margin:0;padding:0}

/* about */
.about{display:grid;grid-template-columns:5fr 7fr;gap:56px;align-items:start}
.about img{border-radius:var(--r);width:100%;aspect-ratio:2/3;object-fit:cover;object-position:50% 20%}
.about small{font-size:15px;color:var(--mut)}
.about h2{margin:6px 0 32px}
.tl h3{font-size:14px;text-transform:uppercase;letter-spacing:.1em;color:var(--mut);margin:28px 0 12px}
.tl ul{margin:0;padding:0;list-style:none;border-left:1px solid var(--soft)}
.tl li{padding:0 0 14px 20px;position:relative;font-size:16px;color:var(--ink2)}
.tl li::before{content:"";position:absolute;left:-5px;top:8px;width:9px;height:9px;border-radius:50%;background:var(--ink)}
.tl b{color:var(--ink);font-weight:500}
@media(max-width:860px){.about{grid-template-columns:1fr;gap:32px}.about img{max-width:440px}}

/* pricing */
.price{display:flex;flex-direction:column;border:1px solid var(--line)}
.price h3{font-size:20px;min-height:2.3em}
.price .sum{font-size:44px;font-weight:500;line-height:1;margin:6px 0 18px}
.price .sum small{font-size:22px;margin-left:4px}
.price p{flex:1}.price .btn{margin-top:20px;width:100%}

/* reviews: native scroll-snap slider */
.revs{display:grid;grid-auto-flow:column;grid-auto-columns:min(380px,86%);gap:20px;overflow-x:auto;scroll-snap-type:x mandatory;padding:4px 20px 20px;scrollbar-width:thin;max-width:var(--w);margin:0 auto}
.rev{scroll-snap-align:start;background:#fff;border-radius:var(--r);overflow:hidden;display:flex;flex-direction:column}
.rev img{width:100%;aspect-ratio:4/3;object-fit:cover}
.rev div{padding:24px 26px 28px;display:flex;flex-direction:column;flex:1}
.rev p{font-size:15px;color:var(--ink2);flex:1}
.rev b{font-weight:500;margin-top:10px}
.ctrl{display:flex;gap:10px;justify-content:flex-end;margin:-20px 0 24px}
.ctrl button{width:48px;height:48px;border-radius:50%;border:1px solid var(--ink);background:#fff;cursor:pointer;font-size:20px;transition:.2s}
.ctrl button:hover{background:var(--ink);color:#fff}
@media(max-width:640px){.ctrl{display:none}}

/* steps */
.steps .card{border:1px solid var(--line)}
.steps .card span{display:block;font-size:14px;text-transform:uppercase;letter-spacing:.1em;color:var(--mut);margin-bottom:16px}
.center{text-align:center;margin-top:40px}

/* form */
.form{max-width:760px;margin:0 auto;text-align:center}
.form h2{margin-bottom:16px}.form>p{color:#cfcfcf;margin-bottom:32px}
.form form{display:grid;grid-template-columns:1fr 1fr auto;gap:12px}
.form input{min-height:52px;border-radius:30px;border:1px solid #555;background:transparent;color:#fff;padding:0 22px;font:16px Roboto,Arial,sans-serif}
.form input::placeholder{color:#9e9e9e}.form input:focus{border-color:#fff;outline:0}
.form small{grid-column:1/-1;color:#9e9e9e;font-size:13px;margin-top:6px}
.form small a{color:#cfcfcf}
.form .ok{grid-column:1/-1;color:#9fe39f;min-height:1em;margin:0}
@media(max-width:700px){.form form{grid-template-columns:1fr}}

/* tests */
.test{display:flex;flex-direction:column}
.test p{flex:1}.test .btn{margin-top:20px;align-self:flex-start}
.note{margin-top:28px;color:var(--mut);font-size:15px;max-width:760px}

/* contacts + footer */
.cont{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.cont div{font-size:18px}.cont span{display:block;font-size:14px;color:var(--mut);margin-bottom:6px;text-transform:uppercase;letter-spacing:.08em}
.cont a{text-decoration:none}.cont a:hover{text-decoration:underline}
@media(max-width:760px){.cont{grid-template-columns:1fr}}
footer{background:var(--ink);color:#bdbdbd;padding:32px 0;font-size:14px}
footer .wrap{display:flex;flex-wrap:wrap;gap:16px 28px;align-items:center}
footer a{text-decoration:none}footer a:hover{color:#fff}
footer .tg{margin-left:auto;display:inline-grid;place-items:center;width:40px;height:40px;border-radius:50%;background:#fff}
@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}