/* ============================================================
   ALUMFASAD.KZ — Design System
   Алюминиевые окна, двери и витражи — Алматы область
   ============================================================ */

:root{
  --bg: #14171a;
  --bg-2: #1b1f23;
  --panel: #1e2328;
  --panel-2: #232a2f;
  --line: #2a2f34;
  --line-soft: rgba(201,208,214,0.10);

  --aluminum: #c9d0d6;
  --aluminum-dim: #6f7982;
  --steel: #5b8aa6;
  --steel-dim: #3d5c6e;
  --glass: #9fe3e8;
  --glass-dim: rgba(159,227,232,0.14);
  --warn: #e0a95b;

  --text: #eef1f3;
  --text-muted: #9098a3;
  --text-faint: #656d76;

  --radius: 2px;
  --maxw: 1280px;

  --font-display: 'Space Grotesk', sans-serif;
  --font-body: 'Inter', sans-serif;
  --font-mono: 'IBM Plex Mono', monospace;
}

*{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }
html,body{
  margin:0; padding:0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  -webkit-font-smoothing: antialiased;
}
img{ max-width:100%; display:block; }
a{ color:inherit; }
button{ font-family: inherit; cursor:pointer; }

.container{
  width:100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 6vw;
}
@media (min-width: 1400px){ .container{ padding: 0 40px; } }

/* ---------- Topbar / Nav ---------- */
.topbar{
  position: sticky; top:0; z-index: 50;
  background: rgba(20,23,26,0.88);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.topbar .container{
  display:flex; align-items:center; justify-content:space-between;
  height: 76px;
}
.logo{
  font-family: var(--font-display);
  font-weight:700; font-size:19px;
  letter-spacing:-0.01em;
  display:flex; align-items:center; gap:9px;
  text-decoration:none; color: var(--text);
}
.logo .mark{
  width:10px; height:10px;
  background: var(--glass);
  border-radius:1px;
  transform: rotate(45deg);
}
.logo b{ color: var(--glass); font-weight:700; }
.logo img{ height:44px; width:auto; display:block; }
footer .logo img{ height:52px; }
@media (max-width:700px){ .logo img{ height:36px; } }

.nav{
  display:flex; align-items:center; gap: 30px;
}
.nav a{
  font-size:14px; font-weight:500;
  text-decoration:none; color: var(--text-muted);
  transition: color .2s ease;
  white-space:nowrap;
}
.nav a:hover, .nav a.active{ color: var(--text); }

.topbar-actions{ display:flex; align-items:center; gap:14px; }
.tel{
  font-family: var(--font-mono);
  font-size:14.5px; font-weight:600;
  text-decoration:none; color: var(--text);
  display:flex; flex-direction:column; line-height:1.25;
}
.tel span{ font-family: var(--font-body); font-weight:400; font-size:11px; color: var(--text-faint); }

.burger{ display:none; background:none; border:1px solid var(--line); color:var(--text); width:40px; height:40px; border-radius:2px; }

@media (max-width: 980px){
  .nav{ display:none; }
  .nav.mobile-open{
    display:flex; flex-direction:column; gap:0;
    position:absolute; top:76px; left:0; right:0;
    background: var(--bg-2); border-bottom:1px solid var(--line);
    padding: 10px 6vw 20px;
  }
  .nav.mobile-open a{ padding:12px 0; border-bottom:1px solid var(--line-soft); }
  .burger{ display:block; }
  .topbar-actions .tel span{ display:none; }
}

/* ---------- Buttons ---------- */
.btn{
  font-family: var(--font-body);
  font-weight:600; font-size:14.5px;
  padding: 15px 26px;
  border-radius: var(--radius);
  text-decoration:none;
  display:inline-flex; align-items:center; justify-content:center;
  gap:8px;
  border: 1px solid transparent;
  transition: transform .22s ease, background .22s ease, border-color .22s ease;
}
.btn-primary{ background: var(--glass); color:#0d1214; border-color: var(--glass); }
.btn-primary:hover{ transform: translateY(-2px); background:#b6ecf0; }
.btn-secondary{ color: var(--text); border-color: var(--line); background:transparent; }
.btn-secondary:hover{ transform: translateY(-2px); border-color: var(--aluminum-dim); }
.btn-block{ width:100%; }
.btn-sm{ padding:11px 18px; font-size:13.5px; }

/* ---------- Type ---------- */
.eyebrow{
  display:inline-flex; align-items:center; gap:10px;
  font-family: var(--font-mono);
  font-size:12.5px; letter-spacing:0.14em; text-transform:uppercase;
  color: var(--glass);
  margin-bottom:18px;
}
.eyebrow::before{ content:""; width:22px; height:1px; background: var(--glass); display:inline-block; }

h1,h2,h3{ font-family: var(--font-display); font-weight:700; letter-spacing:-0.01em; margin:0; color: var(--text); }
h2{ font-size: clamp(28px,3vw,40px); line-height:1.1; }
h3{ font-size: clamp(18px,1.6vw,22px); line-height:1.25; }
p{ line-height:1.65; color: var(--text-muted); margin:0; }

.section{ padding: 96px 0; }
.section-head{ max-width: 640px; margin-bottom: 56px; }
.section-head p{ margin-top:14px; font-size:16px; }
@media (max-width: 700px){ .section{ padding: 64px 0; } }

/* ---------- Cards / grid utility ---------- */
.grid{ display:grid; gap: 22px; }
.g3{ grid-template-columns: repeat(3, 1fr); }
.g4{ grid-template-columns: repeat(4, 1fr); }
@media (max-width: 980px){ .g3, .g4{ grid-template-columns: repeat(2,1fr); } }
@media (max-width: 620px){ .g3, .g4{ grid-template-columns: 1fr; } }

.card{
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 3px;
  padding: 30px;
}
.card-thumb{
  margin: -30px -30px 20px;
  aspect-ratio: 16/10;
  position:relative;
  overflow:hidden;
  border-bottom:1px solid var(--line);
  border-radius: 3px 3px 0 0;
}
.card-thumb img{ width:100%; height:100%; object-fit:cover; display:block; }
.card-thumb::after{
  content:""; position:absolute; inset:0; pointer-events:none;
  background: linear-gradient(150deg, rgba(159,227,232,0.14), transparent 55%), linear-gradient(0deg, rgba(11,14,16,.35), transparent 40%);
}

.product-card{
  background: var(--panel);
  border:1px solid var(--line);
  border-radius:3px;
  overflow:hidden;
  text-decoration:none;
  display:flex; flex-direction:column;
  transition: border-color .25s ease, transform .25s ease;
}
.product-card:hover{ border-color: var(--aluminum-dim); transform: translateY(-4px); }
.product-card .thumb{
  aspect-ratio: 4/3;
  background: var(--panel-2);
  position:relative;
  overflow:hidden;
  border-bottom:1px solid var(--line);
}
.product-card .thumb img{ width:100%; height:100%; object-fit:cover; display:block; transition: transform .5s ease; }
.product-card:hover .thumb img{ transform: scale(1.06); }
.product-card .thumb::after{
  content:""; position:absolute; inset:0; pointer-events:none;
  background: linear-gradient(150deg, rgba(159,227,232,0.16), transparent 55%), linear-gradient(0deg, rgba(11,14,16,.4), transparent 45%);
}
.product-card .body{ padding: 24px; }
.product-card .body span{ font-family: var(--font-mono); font-size:12px; color: var(--glass); }
.product-card .body h3{ margin: 8px 0 10px; }
.product-card .body p{ font-size:14px; }
.product-card .arrow{
  margin-top:16px; font-family: var(--font-mono); font-size:13px; color: var(--aluminum);
  display:flex; align-items:center; gap:6px;
}

/* ---------- spec strip ---------- */
.specs{ display:flex; gap:34px; flex-wrap:wrap; }
.spec{ padding-left:16px; border-left:1px solid var(--line); }
.spec b{ display:block; font-family: var(--font-mono); font-size:22px; font-weight:600; color: var(--aluminum); }
.spec span{ display:block; margin-top:4px; font-size:12.5px; color: var(--text-muted); }

/* ---------- footer ---------- */
footer{ background: var(--bg-2); border-top:1px solid var(--line); padding: 64px 0 30px; }
.foot-grid{ display:grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap:36px; margin-bottom:48px; }
.foot-grid h4{ font-family: var(--font-mono); font-size:12px; letter-spacing:0.1em; text-transform:uppercase; color:var(--text-faint); margin:0 0 16px; }
.foot-grid a{ display:block; font-size:14px; color: var(--text-muted); text-decoration:none; margin-bottom:10px; }
.foot-grid a:hover{ color: var(--text); }
.foot-bottom{ display:flex; justify-content:space-between; flex-wrap:wrap; gap:12px; padding-top:24px; border-top:1px solid var(--line); font-size:12.5px; color: var(--text-faint); }
@media (max-width: 900px){ .foot-grid{ grid-template-columns: 1fr 1fr; } }

/* ---------- WhatsApp float ---------- */
.wa-float{
  position:fixed; right:26px; bottom:26px; z-index:60;
  width:56px; height:56px; border-radius:50%;
  background: var(--glass); color:#0d1214;
  display:flex; align-items:center; justify-content:center;
  text-decoration:none; box-shadow:0 12px 30px rgba(0,0,0,0.4);
  font-size:24px;
}

/* ---------- Calculator ---------- */
.calc{
  background: linear-gradient(160deg, var(--panel-2), var(--panel));
  border:1px solid var(--line);
  border-radius: 4px;
  padding: 40px;
  position:relative;
  overflow:hidden;
}
.calc::before{
  content:"";
  position:absolute; inset:0;
  background-image: linear-gradient(to right, var(--line-soft) 1px, transparent 1px), linear-gradient(to bottom, var(--line-soft) 1px, transparent 1px);
  background-size: 46px 46px;
  opacity:.5; pointer-events:none;
}
.calc-inner{ position:relative; z-index:1; }
.calc-progress{ display:flex; gap:6px; margin-bottom:28px; }
.calc-progress i{ flex:1; height:3px; background: var(--line); border-radius:2px; overflow:hidden; }
.calc-progress i em{ display:block; height:100%; width:0%; background: var(--glass); transition: width .3s ease; }

.calc-step{ display:none; }
.calc-step.active{ display:block; animation: fadeUp .35s ease; }
@keyframes fadeUp{ from{ opacity:0; transform:translateY(10px);} to{opacity:1; transform:none;} }

.calc-step .label{ font-family: var(--font-mono); font-size:12px; letter-spacing:.08em; text-transform:uppercase; color: var(--text-faint); margin-bottom:14px; }
.calc-step h3{ margin-bottom: 22px; }

.opt-grid{ display:grid; grid-template-columns: repeat(3,1fr); gap:12px; }
@media (max-width:700px){ .opt-grid{ grid-template-columns:1fr; } }
.opt{
  border:1px solid var(--line); background: var(--panel);
  border-radius:3px; padding:18px; text-align:left;
  transition: border-color .2s ease, background .2s ease;
  color: var(--text);
}
.opt b{ display:block; font-family: var(--font-display); font-size:15px; margin-bottom:4px; }
.opt span{ display:block; font-size:12.5px; color: var(--text-muted); }
.opt:hover{ border-color: var(--aluminum-dim); }
.opt.selected{ border-color: var(--glass); background: var(--glass-dim); }

.calc-row{ display:flex; gap:16px; flex-wrap:wrap; align-items:flex-end; }
.field{ flex:1; min-width:180px; }
.field label{ display:block; font-size:13px; color: var(--text-muted); margin-bottom:8px; }
.field input{
  width:100%; background: var(--panel); border:1px solid var(--line); color:var(--text);
  padding:14px 16px; border-radius:3px; font-family:var(--font-mono); font-size:15px;
}
.field input:focus{ outline:none; border-color: var(--glass); }
.field small{ display:block; margin-top:8px; color: var(--text-faint); font-size:12px; }

.check-grid{ display:grid; grid-template-columns: repeat(2,1fr); gap:10px; }
@media (max-width:700px){ .check-grid{ grid-template-columns:1fr; } }
.check{
  display:flex; align-items:center; gap:10px;
  border:1px solid var(--line); border-radius:3px; padding:14px 16px;
  font-size:14px; color: var(--text);
}
.check input{ accent-color: var(--glass); width:16px; height:16px; }

.calc-nav{ display:flex; justify-content:space-between; margin-top:30px; gap:12px; }

.calc-result{ text-align:center; padding: 10px 0; }
.calc-result .range{
  font-family: var(--font-mono); font-weight:600;
  font-size: clamp(28px,4vw,42px);
  color: var(--glass);
  margin: 10px 0 6px;
}
.calc-disclaimer{
  margin-top:20px; padding:16px 18px; border:1px solid var(--line);
  border-left:2px solid var(--warn); background: rgba(224,169,91,0.06);
  font-size:13px; color: var(--text-muted); text-align:left; border-radius:2px;
}

/* ---------- FAQ accordion ---------- */
.faq-item{ border-bottom:1px solid var(--line); }
.faq-q{
  width:100%; text-align:left; background:none; border:none; color:var(--text);
  padding: 22px 0; font-family: var(--font-display); font-size:16px; font-weight:600;
  display:flex; justify-content:space-between; align-items:center; gap:16px;
}
.faq-q .icon{ color: var(--glass); font-family: var(--font-mono); flex-shrink:0; }
.faq-a{ max-height:0; overflow:hidden; transition: max-height .3s ease; }
.faq-a p{ padding: 0 0 22px; font-size:14.5px; }
.faq-item.open .faq-a{ max-height:300px; }

/* ---------- misc ---------- */
.tag{ display:inline-block; font-family:var(--font-mono); font-size:11.5px; letter-spacing:.05em; padding:5px 10px; border:1px solid var(--line); border-radius:2px; color:var(--text-muted); margin-right:8px; margin-bottom:8px; }
.divider{ height:1px; background:var(--line); border:none; margin: 64px 0; }
.city-list{ display:flex; flex-wrap:wrap; gap:10px; }
.city-list a{ font-size:13.5px; color:var(--text-muted); text-decoration:none; padding:8px 14px; border:1px solid var(--line); border-radius:20px; }
.city-list a:hover{ color:var(--text); border-color:var(--aluminum-dim); }

/* ---------- article ---------- */
.article{ max-width: 720px; margin: 0 auto; }
.article h2{ font-size: 24px; margin: 44px 0 16px; }
.article h3{ font-size: 18px; margin: 30px 0 12px; }
.article p{ font-size: 16px; color: var(--text); opacity:.88; margin-bottom:18px; }
.article ul{ padding-left: 20px; margin-bottom:18px; }
.article li{ font-size:16px; color: var(--text); opacity:.88; margin-bottom:8px; line-height:1.6; }
.article .lead{ font-size:18px; color: var(--text-muted); margin-bottom: 8px; }
.article-meta{ display:flex; gap:16px; align-items:center; font-family:var(--font-mono); font-size:12.5px; color:var(--text-faint); margin-bottom:24px; }

@media (prefers-reduced-motion: reduce){
  *{ animation-duration:0.01ms !important; }
}