:root{
  --blue:#1f6feb;
  --blue-dark:#1856b8;
  --water:#e7f1ff;
  --ink:#1a2233;
  --muted:#5a6478;
  --line:#e2e6ee;
  --bg:#ffffff;
  --grey:#f5f7fb;
  --dark:#0e1726;
  --accent:#28a76f;
  --shadow:0 4px 16px rgba(20,40,80,.08);
  --radius:14px;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Arial,sans-serif;
  font-size:16px;
  line-height:1.55;
  color:var(--ink);
  background:var(--bg);
  -webkit-font-smoothing:antialiased;
}

.container{max-width:1080px;margin:0 auto;padding:0 20px}

h1,h2,h3{margin:0 0 .5em;line-height:1.2;color:var(--ink)}
h1{font-size:clamp(28px,4.5vw,46px);letter-spacing:-0.5px}
h2{font-size:clamp(24px,3.2vw,34px);text-align:center;margin-bottom:1em}
h3{font-size:20px}
p{margin:0 0 1em}
.lead{font-size:18px;color:var(--muted);max-width:540px}
.lead-center{font-size:17px;color:var(--muted);text-align:center;max-width:640px;margin:0 auto 2em}
.hint{font-size:14px;color:var(--muted);text-align:center;margin-top:1em}

/* NAV */
.nav{
  position:sticky;top:0;z-index:50;
  background:rgba(255,255,255,.92);
  backdrop-filter:saturate(180%) blur(10px);
  border-bottom:1px solid var(--line);
}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:62px}
.logo{font-size:20px;font-weight:800;text-decoration:none;color:var(--ink);letter-spacing:-.3px}
.logo span{color:var(--blue)}
.nav nav{display:flex;gap:18px;align-items:center}
.nav nav a{text-decoration:none;color:var(--ink);font-size:14px;font-weight:500}
.nav nav a:hover{color:var(--blue)}

.lang-switch{display:inline-flex;border:1px solid var(--line);border-radius:8px;overflow:hidden;margin-left:6px}
.lang-switch button{
  background:#fff;border:0;padding:6px 10px;font-size:12px;font-weight:700;
  cursor:pointer;color:var(--muted);font-family:inherit;letter-spacing:.5px;
  transition:background .15s, color .15s;
}
.lang-switch button:hover{color:var(--blue)}
.lang-switch button.active{background:var(--blue);color:#fff}
.lang-switch button + button{border-left:1px solid var(--line)}

@media (max-width:640px){
  .nav nav a:not(.btn){display:none}
  .lang-switch{margin-left:8px}
}

/* BUTTONS */
.btn{
  display:inline-block;padding:13px 22px;border-radius:10px;
  font-weight:600;text-decoration:none;text-align:center;
  border:1px solid transparent;cursor:pointer;font-size:15px;
  transition:transform .05s ease, box-shadow .15s ease, background .15s ease;
}
.btn:active{transform:translateY(1px)}
.btn-primary{background:var(--blue);color:#fff}
.btn-primary:hover{background:var(--blue-dark)}
.btn-ghost{background:transparent;color:var(--ink);border-color:var(--line)}
.btn-ghost:hover{border-color:var(--blue);color:var(--blue)}
.btn-small{padding:8px 14px;font-size:14px}
.btn-block{display:block;width:100%}

/* SECTIONS */
.section{padding:72px 0}
.section-grey{background:var(--grey)}
.section-dark{background:var(--dark);color:#dbe3ef}
.section-dark h2,.section-dark h3{color:#fff}
.section-dark .lead-center{color:#9aa6bb}
.section-dark .hint{color:#7d8ba4}

/* HERO */
.hero{padding:80px 0 90px;background:linear-gradient(180deg,var(--water) 0%, #fff 100%)}
.hero-inner{display:grid;grid-template-columns:1.1fr 1fr;gap:48px;align-items:center}
.hero-actions{display:flex;gap:12px;margin-top:24px;flex-wrap:wrap}
.hero-visual{display:flex;justify-content:center;align-items:center}
.hero-svg{
  width:100%;max-width:440px;height:auto;
  border-radius:14px;
  box-shadow:0 12px 32px rgba(20,40,80,.12);
  background:#e7f1ff;
  display:block;
}
@media (max-width:780px){
  .hero-inner{grid-template-columns:1fr}
  .hero-visual{order:-1}
  .hero-svg{max-width:380px}
}

/* CARDS */
.cards{display:grid;gap:20px}
.cards-2{grid-template-columns:repeat(2,1fr)}
.cards-4{grid-template-columns:repeat(4,1fr)}
@media (max-width:780px){
  .cards-2,.cards-4{grid-template-columns:1fr}
}
.card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:24px;box-shadow:var(--shadow);
}
.card-icon{font-size:32px;margin-bottom:8px}
.card h3{margin-bottom:8px}
.card p{margin:0;color:var(--muted)}

/* PRODUCT CARD */
.product{position:relative;display:flex;flex-direction:column}
.product .badge{
  display:inline-block;align-self:flex-start;
  background:var(--ink);color:#fff;font-weight:700;font-size:14px;
  padding:4px 10px;border-radius:6px;letter-spacing:.5px;margin-bottom:8px;
}
.card-featured{border-color:var(--blue);box-shadow:0 8px 24px rgba(31,111,235,.18)}
.card-featured .badge{background:var(--blue)}
.specs{list-style:none;padding:0;margin:12px 0 20px;border-top:1px solid var(--line)}
.specs li{display:flex;justify-content:space-between;padding:10px 0;border-bottom:1px solid var(--line);font-size:15px}
.specs li span{color:var(--muted)}
.specs li b{color:var(--ink)}

/* STEPS */
.steps{
  list-style:none;padding:0;margin:0;
  display:grid;grid-template-columns:repeat(4,1fr);gap:20px;
  counter-reset:step;
}
@media (max-width:780px){.steps{grid-template-columns:1fr 1fr}}
@media (max-width:480px){.steps{grid-template-columns:1fr}}
.steps li{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:24px;box-shadow:var(--shadow);position:relative;
}
.step-num{
  display:inline-flex;align-items:center;justify-content:center;
  width:36px;height:36px;border-radius:50%;background:var(--blue);color:#fff;
  font-weight:700;margin-bottom:12px;
}
.steps h3{font-size:18px}
.steps p{color:var(--muted);font-size:14px;margin:0}

/* CALC */
.calc{
  display:grid;grid-template-columns:1.2fr 1fr;gap:24px;
  background:#fff;padding:28px;border-radius:var(--radius);
  border:1px solid var(--line);box-shadow:var(--shadow);
}
@media (max-width:780px){.calc{grid-template-columns:1fr;padding:20px}}

.calc-inputs .row{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-bottom:14px}
.calc-inputs .row:has(.check){grid-template-columns:1fr}
@media (max-width:480px){.calc-inputs .row{grid-template-columns:1fr}}

.calc label{display:flex;flex-direction:column;font-size:13px;font-weight:500;color:var(--muted);gap:6px}
.calc input[type=number]{
  font-size:17px;padding:11px 12px;border:1px solid var(--line);border-radius:9px;
  background:#fff;color:var(--ink);font-family:inherit;width:100%;
}
.calc input[type=number]:focus{outline:none;border-color:var(--blue);box-shadow:0 0 0 3px rgba(31,111,235,.15)}
.check{flex-direction:row !important;align-items:center;gap:10px;font-size:15px;color:var(--ink);font-weight:500}
.check input{width:18px;height:18px}

.calc-result{
  background:var(--water);border-radius:12px;padding:22px;display:flex;flex-direction:column;
}
.calc-result h3{margin-bottom:12px}
.bill{list-style:none;padding:0;margin:0 0 16px;flex:1}
.bill li{display:flex;justify-content:space-between;padding:8px 0;border-bottom:1px dashed #c8d6ed;font-size:15px}
.bill li small{color:var(--accent);font-weight:600;margin-left:6px}
.bill li.total{border-bottom:none;font-size:20px;font-weight:700;padding-top:14px;margin-top:8px;border-top:2px solid #b9cdee}

/* TABLE */
.table-wrap{overflow-x:auto}
.cmp{width:100%;border-collapse:collapse;background:#fff;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
.cmp th,.cmp td{padding:12px 14px;text-align:left;border-bottom:1px solid var(--line);font-size:15px}
.cmp th{background:var(--grey);font-weight:600;color:var(--ink);font-size:13px;text-transform:uppercase;letter-spacing:.4px}
.cmp tr:last-child td{border-bottom:none}
.cmp tr.ours{background:#eff6ff}
.cmp tr.ours td{color:var(--ink);font-weight:500}
.cmp tr.base td{background:#dceaff}
.cmp-up{color:#d23636;font-weight:700;font-size:13px;white-space:nowrap;margin-left:4px}
.cmp-down{color:#1d8c4e;font-weight:700;font-size:13px;white-space:nowrap;margin-left:4px}

/* INCLUDES (под ключ) */
.includes{display:grid;grid-template-columns:1.2fr 1fr;gap:24px;align-items:center}
@media (max-width:780px){.includes{grid-template-columns:1fr}}
.includes ul{list-style:none;padding:0;margin:0}
.includes li{padding:10px 0 10px 32px;position:relative;font-size:16px;border-bottom:1px solid var(--line)}
.includes li:before{content:"✓";position:absolute;left:0;top:9px;color:var(--accent);font-weight:700;font-size:18px}
.price-box{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow);text-align:center}
.price-box .price{font-size:22px;font-weight:700;color:var(--ink);margin:8px 0}
.price-box .discount{color:var(--accent);font-weight:600;margin:0}

/* FAQ */
.faq{max-width:780px;margin:0 auto}
.faq details{
  background:#fff;border:1px solid var(--line);border-radius:10px;
  padding:14px 18px;margin-bottom:10px;cursor:pointer;
}
.faq summary{font-weight:600;font-size:16px;list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq summary:after{content:"+";float:right;font-weight:300;font-size:22px;color:var(--blue);transition:transform .2s}
.faq details[open] summary:after{transform:rotate(45deg)}
.faq details p{margin:10px 0 0;color:var(--muted);font-size:15px}

/* FORM */
.form{
  max-width:680px;margin:0 auto;background:#172238;
  padding:28px;border-radius:var(--radius);
}
.form .row{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-bottom:14px}
@media (max-width:560px){.form .row{grid-template-columns:1fr}}
.form label{display:flex;flex-direction:column;font-size:13px;color:#9aa6bb;gap:6px;margin-bottom:14px}
.form input,.form textarea{
  font-size:16px;padding:12px 14px;border:1px solid #2a3855;background:#0e1726;
  color:#fff;border-radius:10px;font-family:inherit;
}
.form input:focus,.form textarea:focus{outline:none;border-color:var(--blue)}
.form textarea{resize:vertical}
.form .hint{color:#7d8ba4;margin-top:14px}

/* FOOTER */
.footer{padding:26px 0;background:#0a121f;color:#7d8ba4;text-align:center;font-size:14px}