/* ============================================================
   AIERA — design system v2 (регламент 11.08.2026)
   Инженерная компания: SYSTEM → CONNECTION → INTELLIGENCE → ACTION
   Тёмный, технический, минималистичный. Без градиентов и glow.
   ============================================================ */

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}

/* ---- Design tokens (п.21 регламента) ---- */
:root{
  --aiera-bg:#080A0D;
  --aiera-surface:#12161C;
  --aiera-surface-2:#1A2028;
  --aiera-border:#252C36;
  --aiera-text:#F3F5F7;
  --aiera-text-secondary:#8B929C;
  --aiera-accent:#E60000;
  --aiera-accent-hover:#FF2A2A;

  --icon-default:#8B929C;
  --icon-hover:#F3F5F7;
  --icon-active:#E60000;

  --font-sans:'Inter',system-ui,-apple-system,'Segoe UI',sans-serif;
  --font-mono:'JetBrains Mono',ui-monospace,'SF Mono',monospace;

  --radius-card:14px;
  --radius-btn:9px;
  --radius-input:9px;
  --maxw:1320px;
  --pad:24px;
  --header-h:68px;
}

html{scroll-behavior:smooth}
body{
  font-family:var(--font-sans);
  background:var(--aiera-bg);
  color:var(--aiera-text);
  line-height:1.55;
  min-height:100vh;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
  font-size:16px;
}
a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}
img,svg{display:block;max-width:100%}
ol,ul{list-style:none}

/* ---- Фоновая инженерная геометрия (п.6) — opacity 0.04-0.12 ---- */
.bg-grid{
  position:fixed;inset:0;z-index:-2;pointer-events:none;
  background-image:
    linear-gradient(rgba(243,245,247,0.05) 1px,transparent 1px),
    linear-gradient(90deg,rgba(243,245,247,0.05) 1px,transparent 1px);
  background-size:64px 64px;
  mask-image:radial-gradient(ellipse 90% 70% at 50% 0%,black 30%,transparent 85%);
  -webkit-mask-image:radial-gradient(ellipse 90% 70% at 50% 0%,black 30%,transparent 85%);
}
.bg-lines{
  position:fixed;inset:0;z-index:-1;pointer-events:none;opacity:0.06;
  background-image:linear-gradient(rgba(230,0,0,0.5) 1px,transparent 1px);
  background-size:100% 1px;
  background-position:0 50%;
}

.container{max-width:var(--maxw);margin:0 auto;padding:0 var(--pad);width:100%}

/* ---- Типографика (п.7) ---- */
.section{
  padding:96px 0;
  border-bottom:1px solid var(--aiera-border);
}
.section-id{
  display:flex;align-items:center;gap:12px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:0.14em;
  color:var(--aiera-text-secondary);
  text-transform:uppercase;
  margin-bottom:18px;
}
.section-id::after{
  content:'';flex:0 0 48px;height:1px;background:var(--aiera-border);
}
.section-title{
  font-size:clamp(28px,4vw,44px);
  font-weight:700;
  letter-spacing:-0.02em;
  line-height:1.1;
  max-width:720px;
}
.section-title .accent{color:var(--aiera-accent)}
.section-sub{
  margin-top:16px;
  color:var(--aiera-text-secondary);
  font-size:17px;
  max-width:640px;
  line-height:1.6;
}

/* ---- Buttons (п.26) ---- */
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:11px 22px;
  border-radius:var(--radius-btn);
  font-size:13px;
  font-weight:600;
  letter-spacing:0.06em;
  text-transform:uppercase;
  transition:background .2s,border-color .2s,color .2s,transform .15s;
  white-space:nowrap;
  cursor:pointer;
}
.btn-primary{
  background:var(--aiera-accent);color:#fff;
  border:1px solid transparent;
}
.btn-primary:hover{background:var(--aiera-accent-hover);transform:translateY(-1px)}
.btn-outline{
  background:transparent;color:var(--aiera-text);
  border:1px solid var(--aiera-border);
}
.btn-outline:hover{border-color:var(--aiera-text-secondary);background:var(--aiera-surface)}
.btn .btn-icon{width:15px;height:15px}

/* ---- Header (п.8) ---- */
.header{
  position:sticky;top:0;z-index:100;
  background:rgba(8,10,13,0.72);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid transparent;
  transition:background .25s,border-color .25s;
}
.header.scrolled{background:rgba(8,10,13,0.94);border-bottom-color:var(--aiera-border)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:var(--header-h);gap:32px}
.logo{display:flex;align-items:center;gap:10px}
.header .logo-mark{width:38px;height:38px}
.footer-brand .logo-mark{width:26px;height:26px}
.logo-text-wrap{display:flex;flex-direction:column;justify-content:center;line-height:1.2}
.logo-text{
  font-size:14px;
  font-weight:600;
  letter-spacing:0.14em;
}
.nav{display:flex;gap:28px}
.nav a{font-size:13.5px;color:var(--aiera-text-secondary);transition:color .2s;font-weight:500}
.nav a:hover{color:var(--aiera-text)}
.header-actions{display:flex;align-items:center;gap:16px}

/* Lang switcher */
.lang-switcher{position:relative}
.lang-btn-current{
  display:flex;align-items:center;gap:6px;
  padding:7px 12px;
  border:1px solid var(--aiera-border);
  border-radius:var(--radius-btn);
  font-size:12.5px;font-weight:600;letter-spacing:0.06em;
  color:var(--aiera-text-secondary);
  transition:border-color .2s,color .2s;
}
.lang-btn-current:hover{border-color:var(--aiera-text-secondary);color:var(--aiera-text)}
.lang-chevron{transition:transform .2s}
.lang-dropdown{
  position:absolute;top:calc(100% + 6px);right:0;
  background:var(--aiera-surface-2);
  border:1px solid var(--aiera-border);
  border-radius:10px;
  padding:4px;
  min-width:150px;
  opacity:0;visibility:hidden;transform:translateY(-4px);
  transition:all .2s;
  z-index:200;
}
.lang-dropdown.open{opacity:1;visibility:visible;transform:translateY(0)}
.lang-option{
  display:flex;align-items:center;gap:8px;width:100%;
  padding:8px 12px;border-radius:7px;
  font-size:13.5px;color:var(--aiera-text-secondary);
  transition:background .15s,color .15s;
}
.lang-option:hover{background:var(--aiera-surface);color:var(--aiera-text)}
.lang-option.active{color:var(--aiera-text)}

.hamburger{
  display:none;flex-direction:column;gap:5px;padding:9px;
  background:var(--aiera-surface-2);
  border:1px solid var(--aiera-border);
  border-radius:10px;
  cursor:pointer;
  transition:background .2s,border-color .2s;
}
.hamburger:hover{border-color:var(--aiera-text-secondary)}
.hamburger:active,.hamburger.open{background:#2A323E;border-color:var(--aiera-text-secondary)}
.hamburger span{width:20px;height:2px;background:var(--aiera-text);transition:all .25s}
.hamburger.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.hamburger.open span:nth-child(2){opacity:0}
.hamburger.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

.mobile-nav{
  display:none;
  position:fixed;top:var(--header-h);left:0;right:0;bottom:0;
  z-index:150;
  background:var(--aiera-surface);
  padding:24px 24px 40px;
  flex-direction:column;gap:6px;
  overflow-y:auto;
  -webkit-overflow-scrolling:touch;
}
.mobile-nav.open{display:flex}
.mobile-nav a{
  padding:14px 12px;
  font-size:17px;font-weight:600;
  color:var(--aiera-text);
  border-bottom:1px solid var(--aiera-border);
}
.mobile-lang{display:flex;gap:8px;margin-top:24px}
.mobile-lang-btn{
  flex:1;padding:12px;
  border:1px solid var(--aiera-border);
  border-radius:var(--radius-btn);
  font-size:14px;font-weight:600;
  color:var(--aiera-text-secondary);
}
.mobile-lang-btn.active{color:var(--aiera-accent);border-color:var(--aiera-accent)}

/* ============================================================
   HERO (п.9, 10) — AI CORE визуализация
   ============================================================ */
.hero{
  padding:110px 0 90px;
  position:relative;
}
.hero-grid{display:grid;grid-template-columns:1.05fr 0.95fr;gap:64px;align-items:center}
.hero-tags{display:flex;gap:10px;margin-bottom:26px;flex-wrap:wrap}
.tag{
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:0.14em;
  text-transform:uppercase;
  color:var(--aiera-text-secondary);
  border:1px solid var(--aiera-border);
  border-radius:6px;
  padding:6px 12px;
}
.tag-dot{color:var(--aiera-accent);align-self:center}
.hero-title{
  font-size:clamp(34px,5vw,58px);
  font-weight:700;
  line-height:1.06;
  letter-spacing:-0.025em;
  margin-bottom:22px;
}
.hero-title .gradient-text{color:var(--aiera-accent)}
.hero-desc{
  font-size:17.5px;
  color:var(--aiera-text-secondary);
  max-width:520px;
  line-height:1.65;
  margin-bottom:34px;
}
.hero-desc a{color:var(--aiera-accent);border-bottom:1px solid rgba(230,0,0,0.4);transition:border-color .2s}
.hero-desc a:hover{border-bottom-color:var(--aiera-accent)}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:44px}
.hero-trust{
  display:flex;gap:10px;flex-wrap:wrap;
}
.trust-chip{
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:0.1em;
  text-transform:uppercase;
  color:var(--aiera-text-secondary);
  border:1px solid var(--aiera-border);
  border-radius:5px;
  padding:5px 10px;
}
.trust-chip b{color:var(--aiera-accent);font-weight:600}

/* AI Core visual (п.10) */
.hero-visual{position:relative;min-height:520px}
.hero-diagram{
  position:relative;
  width:100%;height:520px;
  background:
    linear-gradient(rgba(243,245,247,0.04) 1px,transparent 1px),
    linear-gradient(90deg,rgba(243,245,247,0.04) 1px,transparent 1px);
  background-size:40px 40px;
  border:1px solid var(--aiera-border);
  border-radius:var(--radius-card);
  overflow:hidden;
}
.core-node{
  position:absolute;
  display:flex;align-items:center;justify-content:center;
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:0.12em;
  text-transform:uppercase;
  color:var(--aiera-text-secondary);
  border:1px solid var(--aiera-border);
  background:var(--aiera-bg);
  border-radius:8px;
  padding:7px 12px;
  white-space:nowrap;
  z-index:2;
}
.core-node .dot{
  width:6px;height:6px;border-radius:50%;
  background:var(--aiera-accent);
  margin-right:7px;
  flex:none;
}
.core-center{
  position:absolute;
  left:50%;top:50%;
  transform:translate(-50%,-50%);
  width:140px;height:140px;
  display:flex;align-items:center;justify-content:center;
  border:1px solid var(--aiera-accent);
  border-radius:50%;
  background:rgba(230,0,0,0.06);
  z-index:3;
}
.core-center svg{width:66px;height:66px}
.core-ring{
  position:absolute;left:50%;top:50%;
  transform:translate(-50%,-50%);
  border:1px dashed rgba(230,0,0,0.35);
  border-radius:50%;
  pointer-events:none;
}
.core-ring.r1{width:190px;height:190px}
.core-ring.r2{width:270px;height:270px;animation:ring-spin 24s linear infinite}
.core-ring.r3{width:360px;height:360px;animation:ring-spin 40s linear infinite reverse}
@keyframes ring-spin{to{transform:translate(-50%,-50%) rotate(360deg)}}
.diagram-line{
  position:absolute;background:rgba(230,0,0,0.22);height:1px;z-index:1;
  transform-origin:left center;
}
.flow-dot{
  position:absolute;width:5px;height:5px;border-radius:50%;
  background:var(--aiera-accent);
  z-index:2;
  animation:flow-x 3.2s ease-in-out infinite;
}
@keyframes flow-x{
  0%,100%{opacity:0.3;transform:translateX(0)}
  50%{opacity:1;transform:translateX(var(--flow-dist,40px))}
}
.core-pulse{
  animation:core-pulse 2.6s ease-in-out infinite;
}
@keyframes core-pulse{
  0%,100%{box-shadow:0 0 0 0 rgba(230,0,0,0)}
  50%{box-shadow:0 0 0 12px rgba(230,0,0,0.08)}
}

/* ============================================================
   Dynamic Hero — Living System (spec: specs/dynamic-graph-bg-v2/spec.md)
   SVG is the single visual system. Silver = static, red = activity.
   ============================================================ */
.hero-arch-svg{position:absolute;inset:0;width:100%;height:100%}
.arch-layer,.core-parallax{will-change:transform}
.sys-node{
  cursor:pointer;
  animation:node-breathe 9s ease-in-out infinite;
  animation-delay:var(--breath-delay,0s);
}
.sys-node.active,.sys-node.hovered{animation:none}
@keyframes node-breathe{0%,100%{opacity:1}50%{opacity:.72}}
.sys-node .node-bg{
  fill:var(--aiera-bg);
  stroke:var(--aiera-border);
  stroke-width:1;
  transition:stroke .5s cubic-bezier(.22,1,.36,1);
}
.sys-node .node-dot{fill:var(--aiera-text-secondary);transition:fill .5s}
.sys-node .node-text{
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.12em;
  text-transform:uppercase;
  fill:var(--aiera-text-secondary);
  transition:fill .5s;
}
.sys-node.active .node-bg,.sys-node.hovered .node-bg{stroke:var(--aiera-accent)}
.sys-node.active .node-dot,.sys-node.hovered .node-dot{fill:var(--aiera-accent)}
.sys-node.active .node-text,.sys-node.hovered .node-text{fill:var(--aiera-text)}
.conn{
  stroke:rgba(167,173,184,.14);
  stroke-width:1;
  fill:none;
  transition:stroke .5s cubic-bezier(.22,1,.36,1);
}
.conn.active,.conn.hovered{stroke:rgba(230,0,0,.6)}
.core-halo{fill:rgba(230,0,0,.06);stroke:rgba(167,173,184,.38);stroke-width:1}
.core-img{transform-box:fill-box;transform-origin:center}
.core-layer.pulse .core-img{animation:core-live-pulse .28s cubic-bezier(.22,1,.36,1)}
@keyframes core-live-pulse{
  0%{transform:scale(1)}
  40%{transform:scale(1.04)}
  100%{transform:scale(1)}
}
.particle{fill:var(--aiera-accent);opacity:.85}

/* ============================================================
   Dynamic Graph Hero Background (spec: specs/dynamic-graph-bg/spec.md)
   Canvas-слой между base background и контентом Hero
   ============================================================ */
.hero-graph-canvas{
  position:absolute;
  left:0;right:0;top:0;bottom:0;
  width:100%;height:100%;
  z-index:0;
  pointer-events:none;
}
.hero > .container{position:relative;z-index:1}

/* ============================================================
   Секции-карточки
   ============================================================ */
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}

.card{
  background:var(--aiera-surface);
  border:1px solid var(--aiera-border);
  border-radius:var(--radius-card);
  padding:28px 26px;
  position:relative;
  transition:border-color .25s,background .25s,transform .2s;
}
.card:hover{border-color:var(--aiera-text-secondary);transform:translateY(-2px)}
.card-icon{
  width:44px;height:44px;
  display:flex;align-items:center;justify-content:center;
  border:1px solid var(--aiera-border);
  border-radius:10px;
  background:var(--aiera-surface-2);
  margin-bottom:18px;
  color:var(--aiera-text-secondary);
  transition:color .25s,border-color .25s;
}
.card:hover .card-icon{color:var(--aiera-text);border-color:var(--aiera-text-secondary)}
.card-icon svg{width:22px;height:22px}
.card h3{
  font-size:16px;font-weight:600;letter-spacing:0.02em;
  margin-bottom:10px;
}
.card p{
  font-size:14.5px;
  color:var(--aiera-text-secondary);
  line-height:1.6;
}
.card-arrow{
  position:absolute;right:22px;top:28px;
  color:var(--aiera-text-secondary);
  opacity:0;
  transform:translateX(-6px);
  transition:all .25s;
}
.card:hover .card-arrow{opacity:1;transform:translateX(0);color:var(--aiera-accent)}

/* ---- AI ≠ Chatbot (п.14) ---- */
.compare-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.compare-card{
  background:var(--aiera-surface);
  border:1px solid var(--aiera-border);
  border-radius:var(--radius-card);
  padding:32px;
}
.compare-card h3{
  font-size:13px;font-weight:600;letter-spacing:0.1em;text-transform:uppercase;
  color:var(--aiera-text-secondary);
  margin-bottom:26px;
}
.compare-card.vs-aiera h3{color:var(--aiera-accent)}
.flow-stack{display:flex;flex-direction:column;gap:0}
.flow-step{
  display:flex;align-items:center;gap:14px;
  padding:11px 0;
  font-size:14.5px;
  color:var(--aiera-text);
}
.flow-step .step-ico{
  width:30px;height:30px;flex:none;
  display:flex;align-items:center;justify-content:center;
  border:1px solid var(--aiera-border);
  border-radius:8px;
  color:var(--aiera-text-secondary);
}
.flow-step .step-ico svg{width:15px;height:15px}
.flow-step .step-core .step-ico{border-color:var(--aiera-accent);color:var(--aiera-accent)}
.flow-link{height:20px;display:flex;justify-content:center;position:relative}
.flow-link::before{
  content:'';width:1px;height:100%;
  background:var(--aiera-border);
}
.flow-link.core::before{background:rgba(230,0,0,0.6)}

/* ---- Results (п.15) ---- */
.results-list{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:14px}
.result-item{
  border:1px solid var(--aiera-border);
  border-radius:var(--radius-card);
  padding:24px;
  background:var(--aiera-surface);
  transition:border-color .25s;
}
.result-item:hover{border-color:var(--aiera-text-secondary)}
.result-item .r-value{
  font-family:var(--font-mono);
  font-size:16px;font-weight:600;letter-spacing:0.1em;text-transform:uppercase;
  color:var(--aiera-accent);
  margin-bottom:10px;
}
.result-item .r-label{font-size:15px;font-weight:600;margin-bottom:6px}
.result-item .r-desc{font-size:13.5px;color:var(--aiera-text-secondary);line-height:1.55}

/* Solutions: последний элемент цепочки — accent */
.card p .chain-end{color:var(--aiera-accent);font-weight:600;white-space:nowrap}

/* Cases: RESULT — главный элемент карточки */
.case-result{display:block;margin-top:20px;padding-top:16px;border-top:1px solid var(--aiera-border)}
.case-result strong{color:var(--aiera-accent)}
.case-result span{color:var(--aiera-text);font-weight:600}

/* ---- Architecture (п.16) ---- */
.arch-wrap{
  border:1px solid var(--aiera-border);
  border-radius:var(--radius-card);
  background:var(--aiera-surface);
  padding:40px 32px;
  overflow-x:auto;
}
.arch-flow{display:flex;flex-direction:column;align-items:center;gap:0;min-width:320px}
.arch-node{
  display:flex;align-items:center;gap:10px;
  border:1px solid var(--aiera-border);
  background:var(--aiera-bg);
  border-radius:9px;
  padding:10px 20px;
  font-family:var(--font-mono);
  font-size:12px;letter-spacing:0.12em;text-transform:uppercase;
  color:var(--aiera-text-secondary);
  white-space:nowrap;
}
.arch-node.core{border-color:var(--aiera-accent);color:var(--aiera-accent)}
.arch-node .dot{width:7px;height:7px;border-radius:50%;background:currentColor}
.arch-conn{height:26px;width:1px;background:var(--aiera-border)}
.arch-conn.core{background:rgba(230,0,0,0.6)}
.arch-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px;max-width:480px;margin:0 auto}

/* ---- Process (п.23) ---- */
.process-flow{display:grid;grid-template-columns:repeat(6,1fr);gap:0;position:relative}
.process-step{padding:0 18px;position:relative}
.process-step::before{
  content:'';position:absolute;top:8px;left:0;right:50%;
  height:1px;background:var(--aiera-border);
}
.process-step:first-child::before{display:none}
.process-num{
  font-family:var(--font-mono);font-size:11px;letter-spacing:0.1em;
  color:var(--aiera-accent);
  margin-bottom:14px;
}
.process-step h4{font-size:14px;font-weight:600;margin-bottom:8px}
.process-step p{font-size:13px;color:var(--aiera-text-secondary);line-height:1.55}

/* ---- FAQ (п.27) ---- */
.faq-grid{display:grid;grid-template-columns:0.8fr 1.2fr;gap:48px;align-items:start}
.faq-item{
  border:1px solid var(--aiera-border);
  border-radius:12px;
  margin-bottom:10px;
  background:var(--aiera-surface);
  overflow:hidden;
}
.faq-q{
  width:100%;display:flex;justify-content:space-between;align-items:center;
  padding:18px 20px;
  font-size:15px;font-weight:500;
  color:var(--aiera-text);
  text-align:left;
  transition:color .2s;
}
.faq-q:hover{color:var(--aiera-accent)}
.faq-q .icon{
  width:18px;height:18px;flex:none;
  position:relative;
  transition:transform .25s;
}
.faq-q .icon::before,.faq-q .icon::after{
  content:'';position:absolute;background:currentColor;
  left:50%;top:50%;transform:translate(-50%,-50%);
}
.faq-q .icon::before{width:14px;height:1.5px}
.faq-q .icon::after{width:1.5px;height:14px;transition:transform .25s}
.faq-item.active .faq-q .icon::after{transform:translate(-50%,-50%) rotate(90deg)}
.faq-item.active .faq-q{color:var(--aiera-accent)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .3s ease}
.faq-item.active .faq-a{max-height:400px}
.faq-a-inner{padding:0 20px 18px;font-size:14.5px;color:var(--aiera-text-secondary);line-height:1.65}

/* ---- Contact (п.27) ---- */
.contact-form{
  max-width:560px;
  display:flex;flex-direction:column;gap:16px;
}
.contact-form .btn{
  align-self:flex-start;
}
.form-group input,.form-group textarea{
  width:100%;
  background:var(--aiera-surface);
  border:1px solid var(--aiera-border);
  border-radius:var(--radius-input);
  color:var(--aiera-text);
  padding:13px 16px;
  font-size:14.5px;
  font-family:var(--font-sans);
  transition:border-color .2s;
}
.form-group input:focus,.form-group textarea:focus{
  outline:none;border-color:var(--aiera-accent);
}
.form-group textarea{resize:vertical;min-height:120px}
.form-group input::placeholder,.form-group textarea::placeholder{color:var(--aiera-text-secondary)}
.char-counter{
  font-size:11px;color:var(--aiera-text-secondary);
  text-align:right;margin-top:6px;
}
.char-counter.warn{color:#e8b44c}
.char-counter.limit{color:#e05c5c}
.form-honeypot{display:none}
.captcha-math label{display:block;font-size:13.5px;color:var(--aiera-text-secondary);margin-bottom:8px}

/* ---- Footer (п.28) ---- */
.footer{
  border-top:1px solid var(--aiera-border);
  padding:64px 0 32px;
  background:var(--aiera-bg);
}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;margin-bottom:48px}
.footer-brand p{
  margin-top:14px;
  font-size:14px;color:var(--aiera-text-secondary);
  max-width:280px;line-height:1.6;
}
.footer-brand .logo{display:flex;align-items:center;gap:10px}
.footer-col h4{
  font-size:12px;font-weight:600;letter-spacing:0.12em;text-transform:uppercase;
  color:var(--aiera-text-secondary);
  margin-bottom:18px;
}
.footer-col a{
  display:block;
  font-size:14px;color:var(--aiera-text-secondary);
  padding:5px 0;
  transition:color .2s;
}
.footer-col a:hover{color:var(--aiera-text)}
.footer-bottom{
  display:flex;justify-content:space-between;align-items:center;
  border-top:1px solid var(--aiera-border);
  padding-top:22px;
  font-size:13px;color:var(--aiera-text-secondary);
}
.footer-email{color:var(--aiera-text-secondary);transition:color .2s}
.footer-email:hover{color:var(--aiera-text)}

/* ---- Modals ---- */
.modal-overlay{
  position:fixed;inset:0;z-index:300;
  background:rgba(0,0,0,0.7);
  opacity:0;visibility:hidden;transition:all .25s;
}
.modal-overlay.active{opacity:1;visibility:visible}
.modal{
  position:fixed;z-index:301;
  left:50%;top:50%;
  transform:translate(-50%,-50%) scale(0.97);
  width:min(680px,92vw);
  max-height:82vh;
  overflow-y:auto;
  background:var(--aiera-surface);
  border:1px solid var(--aiera-border);
  border-radius:var(--radius-card);
  padding:32px;
  opacity:0;visibility:hidden;
  transition:all .25s;
}
.modal.active{opacity:1;visibility:visible;transform:translate(-50%,-50%) scale(1)}
.modal-close{
  position:absolute;right:18px;top:14px;
  font-size:24px;color:var(--aiera-text-secondary);
  line-height:1;
}
.modal-close:hover{color:var(--aiera-text)}
.modal-body h3{font-size:18px;margin-bottom:14px}
.modal-body p,.modal-body li{
  font-size:14.5px;color:var(--aiera-text-secondary);
  line-height:1.65;margin-bottom:10px;
}
.modal-body ul{padding-left:18px;list-style:disc}

/* ---- Responsive (п.30) ---- */
@media (max-width:1100px){
  .grid-4{grid-template-columns:repeat(2,1fr)}
  .process-flow{grid-template-columns:repeat(3,1fr);gap:24px 0}
  .process-step::before{display:none}
}
@media (max-width:960px){
  .hero-grid{grid-template-columns:1fr;gap:48px}
  .hero-visual{min-height:420px}
  .nav{display:none}
  .header-actions .btn-primary{display:none}
  .hamburger{display:flex}
  .compare-grid{grid-template-columns:1fr}
  .grid-3{grid-template-columns:1fr}
  .grid-2{grid-template-columns:1fr}
  .faq-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
  .arch-grid{grid-template-columns:1fr}
}
@media (max-width:640px){
  .section{padding:64px 0}
  .hero{padding:72px 0 56px}
  .grid-4{grid-template-columns:1fr}
  .process-flow{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .footer-bottom{flex-direction:column;gap:10px;align-items:flex-start}
  .hero-cta{flex-direction:column;align-items:stretch}
  .hero-cta .btn{justify-content:center}
}

/* ---- prefers-reduced-motion (п.31) ---- */
@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important}
  html{scroll-behavior:auto}
}