/* Cen — стили с поддержкой светлой и тёмной темы */

:root{
  --ink:#0b1220;
  --body:#475569;
  --muted:#64748b;
  --line:#e2e8f0;
  --bg:#f7f9fc;
  --card:#ffffff;
  --soft:#eef4ff;
  --accent:#2563eb;
  --accent-dark:#1d4ed8;
  --accent-soft:#dbeafe;
  --ok:#16a34a;
  --warn:#f59e0b;
  --radius:16px;
  --shadow:0 1px 2px rgba(15,23,42,.04), 0 10px 30px rgba(15,23,42,.06);
  --shadow-lg:0 24px 60px rgba(15,23,42,.12);
  --hero-glow:rgba(37,99,235,.14);
  --hero-glow2:rgba(14,165,233,.12);
  --header-bg:rgba(255,255,255,.82);
}

html[data-theme="dark"]{
  --ink:#e9eff8;
  --body:#aab7ca;
  --muted:#8494ab;
  --line:#1e2c42;
  --bg:#080e18;
  --card:#0e1828;
  --soft:#16233a;
  --accent:#5b95ff;
  --accent-dark:#3f7bf0;
  --accent-soft:#172a4d;
  --ok:#34d399;
  --shadow:0 1px 2px rgba(0,0,0,.4), 0 14px 40px rgba(0,0,0,.35);
  --shadow-lg:0 30px 70px rgba(0,0,0,.5);
  --hero-glow:rgba(64,120,255,.22);
  --hero-glow2:rgba(14,165,233,.16);
  --header-bg:rgba(8,14,24,.82);
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;background:var(--bg);color:var(--ink);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Arial,sans-serif;
  line-height:1.55;-webkit-font-smoothing:antialiased;
  transition:background .25s ease,color .25s ease;
}
img{max-width:100%;display:block}
a{color:var(--accent);text-decoration:none}
h1,h2,h3{letter-spacing:-.025em;line-height:1.12;margin:0}
h1{font-size:clamp(34px,5vw,58px);font-weight:760}
h2{font-size:clamp(24px,3vw,34px);font-weight:730}
h3{font-size:17px;font-weight:660}
p{margin:0 0 14px}

.container{max-width:1140px;margin:0 auto;padding:0 22px}

/* header */
.site-header{position:sticky;top:0;z-index:50;background:var(--header-bg);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;gap:20px;height:70px}
.logo{display:flex;align-items:center;gap:10px;font-weight:760;font-size:17px;color:var(--ink)}
.logo-mark{width:32px;height:32px;flex:none}
.nav-links{display:flex;gap:2px;margin-left:6px}
.nav-links a{padding:8px 12px;border-radius:9px;color:var(--body);font-size:14.5px;font-weight:530}
.nav-links a:hover{background:var(--soft);color:var(--ink)}
.nav-links a.active{background:var(--soft);color:var(--accent)}
.nav-actions{margin-left:auto;display:flex;align-items:center;gap:8px}

/* theme toggle */
.theme-toggle{width:38px;height:38px;border-radius:10px;border:1px solid var(--line);background:var(--card);
  color:var(--body);display:inline-flex;align-items:center;justify-content:center;cursor:pointer;transition:.16s}
.theme-toggle:hover{border-color:var(--accent);color:var(--accent)}
.theme-toggle svg{width:18px;height:18px}
.theme-toggle .i-sun{display:none}
html[data-theme="dark"] .theme-toggle .i-sun{display:block}
html[data-theme="dark"] .theme-toggle .i-moon{display:none}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 20px;border-radius:11px;font:inherit;font-weight:640;font-size:14.5px;
  border:1px solid transparent;cursor:pointer;transition:.18s;white-space:nowrap}
.btn-primary{background:var(--accent);color:#fff;box-shadow:0 8px 22px rgba(37,99,235,.28)}
.btn-primary:hover{background:var(--accent-dark);transform:translateY(-1px)}
.btn-ghost{background:var(--card);border-color:var(--line);color:var(--ink)}
.btn-ghost:hover{border-color:var(--accent);color:var(--accent)}
.btn-lg{padding:14px 24px;font-size:15.5px}
.btn[disabled]{opacity:.6;cursor:default;transform:none}

/* hero */
.hero{position:relative;padding:70px 0 60px;overflow:hidden}
.hero::before{content:"";position:absolute;inset:-30% 10% 20% -20%;
  background:radial-gradient(620px 420px at 28% 26%, var(--hero-glow), transparent 70%),
             radial-gradient(520px 380px at 78% 6%, var(--hero-glow2), transparent 70%);
  pointer-events:none}
.hero .container{position:relative}
.hero-grid{display:grid;grid-template-columns:1.04fr .96fr;gap:48px;align-items:center}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:12.5px;font-weight:660;
  letter-spacing:.09em;text-transform:uppercase;color:var(--accent);background:var(--soft);
  padding:6px 12px;border-radius:99px;margin-bottom:18px}
.lead{font-size:clamp(16px,1.9vw,19px);color:var(--body);max-width:560px;margin:18px 0 26px}
.hero-actions{display:flex;gap:10px;flex-wrap:wrap}
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-top:44px}
.stat{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:14px 16px}
.stat b{display:block;font-size:22px;letter-spacing:-.03em;margin-bottom:2px}
.stat span{font-size:12px;color:var(--muted)}

/* hero visual */
.hero-visual{position:relative}
.browser{background:var(--card);border:1px solid var(--line);border-radius:18px;overflow:hidden;
  box-shadow:var(--shadow-lg);transform:rotate(-1.2deg)}
.browser-bar{display:flex;align-items:center;gap:6px;padding:11px 14px;border-bottom:1px solid var(--line);background:var(--soft)}
.browser-bar span{width:9px;height:9px;border-radius:50%;background:#ef4444;opacity:.85}
.browser-bar span:nth-child(2){background:#f59e0b}
.browser-bar span:nth-child(3){background:#22c55e}
.browser-bar em{margin-left:10px;font-style:normal;font-size:11.5px;color:var(--muted)}
.browser-body{padding:16px}
.browser-search{display:flex;align-items:center;gap:8px;border:1px solid var(--line);border-radius:10px;
  padding:9px 12px;color:var(--muted);font-size:13px;background:var(--bg);margin-bottom:10px}
.browser-search svg{width:15px;height:15px;flex:none}
.browser-filters{display:flex;gap:6px;margin-bottom:12px}
.chip{font-size:11.5px;padding:4px 9px;border-radius:7px;background:var(--soft);color:var(--body)}
.browser-row{display:grid;grid-template-columns:1fr 40px 64px;gap:10px;padding:8px 4px;
  border-bottom:1px solid var(--line);font-size:12.5px;color:var(--body)}
.browser-row:last-child{border-bottom:none}
.browser-row.head{color:var(--muted);font-size:10.5px;text-transform:uppercase;letter-spacing:.06em}
.browser-row span:last-child{text-align:right;font-variant-numeric:tabular-nums;color:var(--ink);font-weight:600}
.float-card{position:absolute;right:-8px;bottom:-18px;background:var(--card);border:1px solid var(--line);
  border-radius:14px;padding:12px 16px;box-shadow:var(--shadow-lg)}
.float-card b{display:block;font-size:19px;letter-spacing:-.02em}
.float-card span{font-size:11.5px;color:var(--muted)}

/* sections */
section{padding:68px 0}
.section-head{max-width:700px;margin-bottom:28px}
.section-head p{color:var(--body);margin-top:10px}
.kicker{font-size:12.5px;font-weight:660;letter-spacing:.09em;text-transform:uppercase;color:var(--accent);margin-bottom:10px}

/* cards */
.grid{display:grid;gap:16px}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:24px;
  box-shadow:var(--shadow);transition:.18s}
.card:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg);border-color:var(--accent)}
.card h3{margin-bottom:8px}
.card p{color:var(--body);font-size:14.5px;margin:0}
.card .price{display:inline-block;margin-top:14px;font-weight:650;font-size:13.5px;color:var(--accent);background:var(--soft);padding:5px 10px;border-radius:8px}
.icon{width:42px;height:42px;border-radius:12px;background:var(--soft);color:var(--accent);
  display:flex;align-items:center;justify-content:center;margin-bottom:16px}
.icon svg{width:21px;height:21px}

/* steps */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;counter-reset:step}
.step{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px}
.step::before{counter-increment:step;content:counter(step);display:flex;align-items:center;justify-content:center;
  width:28px;height:28px;border-radius:9px;background:var(--accent);color:#fff;font-size:13px;font-weight:700;margin-bottom:12px}
.step b{display:block;font-size:15px;margin-bottom:4px}
.step span{font-size:13.5px;color:var(--muted)}

/* payment */
.pay{display:grid;grid-template-columns:1.05fr .95fr;gap:28px;align-items:center;
  background:var(--card);border:1px solid var(--line);border-radius:22px;padding:32px;box-shadow:var(--shadow)}
.pay h2{margin-bottom:10px}
.pay p{color:var(--body);margin:0}
.pay-visual{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.pay-half{background:var(--soft);border-radius:16px;padding:20px;text-align:center}
.pay-half b{display:block;font-size:32px;color:var(--accent);letter-spacing:-.03em}
.pay-half span{font-size:12.5px;color:var(--muted)}

/* calculator */
.calc{display:grid;grid-template-columns:1.1fr .9fr;gap:18px;align-items:start}
.calc-box{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:26px;box-shadow:var(--shadow)}
label.field-label{display:block;font-size:13px;font-weight:650;margin:16px 0 6px;color:var(--ink)}
select,input[type=text],input[type=email],input[type=tel],textarea{
  width:100%;font:inherit;font-size:14.5px;padding:11px 13px;border:1px solid var(--line);
  border-radius:10px;background:var(--bg);color:var(--ink);transition:.15s}
select:focus,input:focus,textarea:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px rgba(37,99,235,.16)}
.checks{display:flex;flex-direction:column;gap:10px;margin-top:12px}
.check{display:flex;align-items:center;gap:10px;font-size:14.5px;font-weight:450;color:var(--ink)}
.check input{width:17px;height:17px;accent-color:var(--accent)}
.check .muted{color:var(--muted);font-size:13px}
.total{background:linear-gradient(160deg,#1e3a8a,#2563eb);color:#fff;border-radius:18px;padding:28px;
  position:sticky;top:88px;box-shadow:0 20px 50px rgba(37,99,235,.3)}
.total .label{font-size:13px;opacity:.82}
.total .sum{font-size:40px;font-weight:760;letter-spacing:-.03em;margin:4px 0}
.total .note{font-size:13px;opacity:.86;margin-bottom:18px}
.total .btn{width:100%;background:#fff;color:#1d4ed8;box-shadow:none}
.total .btn:hover{background:#eef4ff}

/* reviews */
.reviews-head{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;margin-bottom:22px}
.stars{color:var(--warn);letter-spacing:2px;font-size:15px}
.empty-state{background:var(--card);border:1px dashed var(--line);border-radius:18px;padding:34px;text-align:center;margin-bottom:18px}
.empty-state h3{margin:8px 0 6px}
.empty-state p{color:var(--muted);margin:0;font-size:14px}

/* forms */
.form-card{background:var(--card);border:1px solid var(--line);border-radius:20px;padding:28px;box-shadow:var(--shadow)}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.form-grid .full{grid-column:1/-1}
.field{display:flex;flex-direction:column;gap:6px}
.field label{font-size:12.5px;font-weight:650;color:var(--muted)}
.form-note{font-size:12px;color:var(--muted);margin:6px 0 0}
.form-note.ok{color:var(--ok)}
.form-note.err{color:#ef4444}

.star-picker{display:flex;gap:4px}
.star-picker button{background:none;border:none;font-size:26px;line-height:1;cursor:pointer;color:#cbd5e1;padding:0 2px;transition:.12s}
.star-picker button.on{color:var(--warn)}

/* examples */
.ex-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:16px}
.ex{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:26px;box-shadow:var(--shadow);display:flex;flex-direction:column}
.ex h3{font-size:19px;margin-bottom:8px}
.ex p{color:var(--body);font-size:14.5px}
.ex-stats{display:flex;gap:24px;margin:6px 0 20px;flex-wrap:wrap}
.ex-stats b{display:block;font-size:21px;letter-spacing:-.02em}
.ex-stats span{font-size:12px;color:var(--muted)}
.ex-actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:auto}
.tag{display:inline-block;font-size:11px;font-weight:660;letter-spacing:.06em;text-transform:uppercase;
  padding:4px 9px;border-radius:7px;margin-bottom:12px}
.tag.blue{background:var(--soft);color:var(--accent)}
.tag.green{background:rgba(22,163,74,.12);color:var(--ok)}

/* cta band */
.cta-band{background:linear-gradient(135deg,#0f1f3d,#1d4ed8);color:#fff;border-radius:24px;padding:46px;text-align:center;
  box-shadow:0 30px 70px rgba(29,78,216,.28)}
.cta-band h2{color:#fff;margin-bottom:10px}
.cta-band p{color:rgba(255,255,255,.8);max-width:560px;margin:0 auto 22px}
.cta-band .btn-primary{background:#fff;color:#1d4ed8;box-shadow:none}
.cta-band .btn-primary:hover{background:#eef4ff}

/* footer */
.site-footer{border-top:1px solid var(--line);padding:32px 0;color:var(--muted);font-size:13.5px;background:var(--card)}
.footer-row{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;align-items:center}
.footer-links{display:flex;gap:16px;flex-wrap:wrap}

/* chat */
.chat{position:fixed;right:20px;bottom:20px;z-index:60}
.chat-btn{display:inline-flex;align-items:center;gap:8px;border:none;border-radius:999px;
  padding:13px 18px;background:var(--accent);color:#fff;font:inherit;font-weight:650;cursor:pointer;
  box-shadow:0 12px 30px rgba(37,99,235,.38)}
.chat-btn:hover{background:var(--accent-dark)}
.chat-panel{position:absolute;right:0;bottom:64px;width:340px;max-width:calc(100vw - 40px);
  background:var(--card);border:1px solid var(--line);border-radius:16px;overflow:hidden;
  box-shadow:var(--shadow-lg);display:flex;flex-direction:column}
.chat-panel[hidden]{display:none}
.chat-head{display:flex;align-items:center;justify-content:space-between;padding:12px 14px;border-bottom:1px solid var(--line)}
.chat-title{display:flex;align-items:center;gap:8px;font-weight:700;font-size:14px}
.chat-dot{width:8px;height:8px;border-radius:50%;background:var(--ok)}
.chat-close{border:none;background:none;font-size:22px;line-height:1;color:var(--muted);cursor:pointer}
.chat-body{padding:14px;display:flex;flex-direction:column;gap:8px;max-height:220px;overflow:auto;background:var(--bg)}
.chat-msg{font-size:13.5px;line-height:1.4;padding:9px 12px;border-radius:12px;max-width:88%}
.chat-msg.bot{background:var(--soft);color:var(--ink);border-bottom-left-radius:4px}
.chat-msg.me{background:var(--accent);color:#fff;align-self:flex-end;border-bottom-right-radius:4px}
.chat-form{display:flex;flex-direction:column;gap:8px;padding:12px;border-top:1px solid var(--line)}
.chat-form input,.chat-form textarea{font-size:13.5px;padding:9px 11px;border-radius:9px;resize:none}
.chat-note{font-size:11px;color:var(--muted);margin:0;min-height:13px}

.hp{position:absolute;left:-9999px;width:0;height:0;opacity:0}

/* responsive */
@media(max-width:960px){
  .hero-grid{grid-template-columns:1fr;gap:34px}
  .hero-visual{max-width:520px}
  .grid-4{grid-template-columns:repeat(2,1fr)}
  .steps{grid-template-columns:repeat(2,1fr)}
  .calc{grid-template-columns:1fr}
  .total{position:static}
  .pay{grid-template-columns:1fr}
  .ex-grid{grid-template-columns:1fr}
  .stats{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:720px){
  .nav-links{display:none}
  .hero{padding:46px 0 40px}
  section{padding:48px 0}
  .grid-2,.grid-3,.grid-4{grid-template-columns:1fr}
  .form-grid{grid-template-columns:1fr}
  .cta-band{padding:32px 20px;border-radius:18px}
  .reviews-head{flex-direction:column;align-items:flex-start}
  .float-card{right:0;bottom:-14px}
}
@media(max-width:520px){
  .chat{right:12px;bottom:12px}
  .chat-btn .label{display:none}
}