/* ====== Base / Variables ====== */
:root{
    --bg: #f5f6f8;
    --bg-soft: #ffffff;
    --bg-elev: #eef0f4;
    --text: #0f1115;
    --muted: #4b5563;
    --border: #e5e7eb;
    --accent: #696969;
    --radius: 14px;
    --shadow: 0 18px 40px rgba(0,0,0,.08);
  }
  /* Gray (тёмно‑серый) тема */
  [data-theme="gray"]{
    --bg: #1f2226;
    --bg-soft: #1a1d21;
    --bg-elev: #181b1f;
    --text: #e7eaf0;
    --muted: #9aa2b2;
    --border: #2b2f36;
    --accent: #8a8f99;
    --shadow: 0 18px 40px rgba(0,0,0,.35);
  }
  
  *{ box-sizing: border-box; }
  html,body{ height:100%; }
  html{ scroll-behavior:smooth; }
  body{
    margin:0;
    background: var(--bg);
    color: var(--text);
    font: 16px/1.55 Inter, system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
  }
  /* Плавный переход при включении тёмной и светлой тем */
  .is-theming-dark, .is-theming-dark *,
  .is-theming-dark *::before, .is-theming-dark *::after{
    transition: background-color .9s cubic-bezier(.22,.61,.36,1),
                background .9s cubic-bezier(.22,.61,.36,1),
                color .9s cubic-bezier(.22,.61,.36,1),
                border-color .9s cubic-bezier(.22,.61,.36,1),
                outline-color .9s cubic-bezier(.22,.61,.36,1),
                text-decoration-color .9s cubic-bezier(.22,.61,.36,1),
                fill .9s cubic-bezier(.22,.61,.36,1),
                stroke .9s cubic-bezier(.22,.61,.36,1),
                filter .9s cubic-bezier(.22,.61,.36,1);
  }
  .is-theming-light, .is-theming-light *,
  .is-theming-light *::before, .is-theming-light *::after{
    transition: background-color .9s cubic-bezier(.22,.61,.36,1),
                background .9s cubic-bezier(.22,.61,.36,1),
                color .9s cubic-bezier(.22,.61,.36,1),
                border-color .9s cubic-bezier(.22,.61,.36,1),
                outline-color .9s cubic-bezier(.22,.61,.36,1),
                text-decoration-color .9s cubic-bezier(.22,.61,.36,1),
                fill .9s cubic-bezier(.22,.61,.36,1),
                stroke .9s cubic-bezier(.22,.61,.36,1),
                filter .9s cubic-bezier(.22,.61,.36,1);
  }
  /* Убираем любую задержку анимаций, чтобы всё стартовало одновременно */
  .is-theming-dark *, .is-theming-dark *::before, .is-theming-dark *::after,
  .is-theming-light *, .is-theming-light *::before, .is-theming-light *::after{
    transition-delay: 0s !important;
  }
/* canvas background */
  .bg-net{ position:fixed; inset:0; z-index:0; pointer-events:none; width:100vw; height:100vh; }
  /* ensure content sits above */
  .site-header, main, .site-footer, .page-transition{ position:relative; z-index:1; }
  
  img{ max-width:100%; display:block; }
  a{ color:inherit; text-decoration:none; }
  button{ font: inherit; }
  
  .container{ width:min(1120px, 92%); margin:0 auto; }
  .narrow{ width:min(860px, 92%); margin:0 auto; }
  .muted{ color:var(--muted); }
  
  /* ====== Header / Nav ====== */
  .site-header{
    position: sticky; top:0; z-index:1000;
    backdrop-filter: blur(8px);
    background: linear-gradient(180deg, rgba(255,255,255,.85), rgba(255,255,255,.72));
    border-bottom: 1px solid var(--border);
  }
  [data-theme="gray"] .site-header{ background: linear-gradient(180deg, rgba(26,29,33,.85), rgba(26,29,33,.70)); }
  .nav-wrap{ display:flex; align-items:center; justify-content:space-between; min-height:66px; }
  
  .logo{
    font-family: Poppins, Inter, sans-serif;
    font-weight: 800; letter-spacing:.3px; font-size:20px;
    display:inline-flex; align-items:center; gap:.35ch;
  }
  .logo span{ color:var(--accent); }
  
  .nav{ display:flex; gap:20px; align-items:center; }
  .nav-link{
    display:inline-flex; align-items:center; gap:8px;
    padding:10px 12px; border-radius:10px; color:var(--muted);
    transition: color .2s ease, background .2s ease, transform .2s ease;
  }
  .nav-link:hover{ color:var(--text); background: rgba(0,0,0,.06); }
  .nav-link.active{ color:var(--text); background: rgba(0,0,0,.10); }
  
  .burger{
    display:none; background:none; border:0; padding:6px 4px; cursor:pointer;
  }
  .burger span{
    display:block; width:26px; height:2px; background:#cfcfd6; margin:6px 0; transition:transform .25s ease, opacity .2s;
  }
  [data-theme="gray"] .burger span{ background:#e5e7eb; }
  .burger[aria-expanded="true"] span:nth-child(1){ transform: translateY(8px) rotate(45deg); }
  .burger[aria-expanded="true"] span:nth-child(2){ opacity:0; }
  .burger[aria-expanded="true"] span:nth-child(3){ transform: translateY(-8px) rotate(-45deg); }
  
  /* ====== Hero ====== */
  .hero{
    position: relative;
    padding: 90px 0 60px;
    background: transparent;
    overflow:hidden;
  }
  /* убран декоративный слой hero-bg */
  .hero-inner{
    display:grid; grid-template-columns: 1.1fr .9fr; gap:40px; align-items:center;
  }
  .hero-title{
    font-family: Poppins, Inter, sans-serif;
    font-weight:800; font-size: clamp(40px, 6.4vw, 68px); line-height:1.05; margin:0 0 8px;
  }
  .accent{ color:var(--accent); }
  .hero-subtitle{ font-size: clamp(18px, 2.2vw, 22px); margin: 6px 0 26px; color: #374151; }
  /* framed paragraph in hero removed */
  [data-theme="gray"] .hero-subtitle{ color:#cfd4dd; }
  .hero-actions{ display:flex; gap:12px; flex-wrap:wrap; margin-bottom:22px; }
  /* framed hero block */
  .hero-content{
    display:inline-block;
    padding: 0;
    border-radius: 0;
    border:0; background: transparent;
    -webkit-backdrop-filter: none; backdrop-filter: none;
    box-shadow: none;
  }
  [data-theme="gray"] .hero-content{ border:0; background: transparent; }
  .socials a{ display:inline-flex; width:46px; height:46px; align-items:center; justify-content:center; border:1px solid var(--border); border-radius:12px; color:#4b5563; transition:all .2s; background:#fff; }
  .socials a i{ font-size:20px; }
  .socials a:hover{ border-color: rgba(0,0,0,.18); box-shadow:0 6px 18px rgba(0,0,0,.08); transform: translateY(-1px); }
  [data-theme="gray"] .socials a{ background: transparent; color:#e7eaf0; }
  [data-theme="gray"] .socials a:hover{ border-color: rgba(255,255,255,.2); box-shadow:0 6px 18px rgba(0,0,0,.25); }
  .hero-visual{ position:relative; min-height:280px; }
  /* убраны орбы */
  
  /* ====== Sections / Cards ====== */
  .section{ padding: 64px 0; background: transparent; }
  .section.alt{ background: transparent; border-top:0; border-bottom:0;}
  /* Базовые переходы для секций, чтобы реагировали сразу при смене темы */
  .section, .section.alt{ transition: background .9s cubic-bezier(.22,.61,.36,1), border-color .9s cubic-bezier(.22,.61,.36,1); }
  /* Явный transition для секций, чтобы не отставали */
  .is-theming .section,
  .is-theming .section.alt{
    transition: background .9s cubic-bezier(.22,.61,.36,1), border-color .9s cubic-bezier(.22,.61,.36,1);
  }
  /* Карточки и родственные блоки — синхронный переход */
  .is-theming .card,
  .is-theming .card-icon,
  .is-theming .news-card,
  .is-theming .contact-card,
  .is-theming .contact-form,
  .is-theming .cta-inner{
    transition: background .9s cubic-bezier(.22,.61,.36,1),
                border-color .9s cubic-bezier(.22,.61,.36,1);
    will-change: background, border-color, box-shadow;
  }
  .section-head{ margin-bottom: 26px; }
  .section-title{
    font-family:Poppins, Inter, sans-serif; font-weight:700; font-size: clamp(24px, 3.2vw, 36px); margin:0 0 8px;
  }
  .lead{ font-size:18px; color:#374151; }
  [data-theme="gray"] .lead{ color:#cfd4dd; }
  
  .grid{ display:grid; gap:18px; }
  .cards-4{ grid-template-columns: repeat(4, 1fr); }
  
  .card{
    background: linear-gradient(180deg, var(--bg-soft), var(--bg-elev));
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: var(--shadow);
    transform: translateY(0);
    transition: transform .25s ease, border-color .25s ease, box-shadow .25s ease,
                background .9s cubic-bezier(.22,.61,.36,1), color .9s cubic-bezier(.22,.61,.36,1);
    contain: paint;
  }
  .card:hover{ transform: translateY(-4px); border-color: rgba(0,0,0,.12); box-shadow: 0 22px 44px rgba(0,0,0,.10); }
  .card h3{ margin: 6px 0 8px; font-size: 18px; }
  .card p{ margin:0; color:var(--muted); }
  .card-icon{
    width:44px; height:44px; display:grid; place-items:center;
    border-radius:12px; color:#111; background: linear-gradient(135deg, #e7e9ee, #dfe2e9);
    border:1px solid #d6dae1;
    transition: background .9s cubic-bezier(.22,.61,.36,1), border-color .9s cubic-bezier(.22,.61,.36,1);
  }
  .link-card{ display:block; }
  
  /* ====== CTA ====== */
  .cta{
    padding: 56px 0;
    background: var(--bg);
    border-top: 0;
  }
  .cta-inner{
    display:flex; align-items:center; justify-content:space-between; gap:20px;
    background: linear-gradient(180deg, var(--bg-soft), var(--bg-elev));
    border:1px solid var(--border); border-radius:var(--radius);
    padding: 20px 22px; box-shadow: var(--shadow);
  }
  .cta h3{ margin:0 0 6px; }
  
  /* ====== Buttons ====== */
  .btn{
    display:inline-flex; align-items:center; gap:10px;
    background: linear-gradient(135deg, #343a40, #555b62);
    color:#fff; border:1px solid #4b4f56;
    padding: 10px 14px; border-radius:12px; font-weight:600;
    transition: transform .2s ease, box-shadow .25s ease, filter .25s ease;
  }
  .btn:hover{ transform: translateY(-2px); box-shadow:0 18px 40px rgba(0,0,0,.18); }
  .btn-ghost{
    background: transparent; color:#0f1115; border:1px solid var(--border);
    box-shadow:none;
  }
  .btn-ghost:hover{ border-color: rgba(0,0,0,.25); box-shadow:0 12px 26px rgba(0,0,0,.08); }
  [data-theme="gray"] .btn-ghost{ color:#e7eaf0; }
  [data-theme="gray"] .btn-ghost:hover{ border-color: rgba(255,255,255,.25); box-shadow:0 12px 26px rgba(0,0,0,.35); }
  
  /* ====== Timeline ====== */
  .timeline{ position:relative; margin:16px 0; }
  .timeline::before{
    content:""; position:absolute; left:18px; top:0; bottom:0; width:2px; background: linear-gradient(180deg, rgba(0,0,0,.25), rgba(0,0,0,.0)); z-index:0;
  }
  .timeline-item{
    position:relative; padding-left:56px; margin: 18px 0;
  }
  .timeline-item .time{
    position:absolute; left:0; top:2px; width:40px; height:24px; font-size:12px; color:#374151;
    background: var(--bg); border:1px solid rgba(0,0,0,.12);
    border-radius:8px; display:grid; place-items:center; z-index:1;
  }
  .timeline-item .content h3{ margin:0 0 6px; font-size:18px; }
  .timeline-item .content p{ margin:0; color:var(--muted); }
  
  /* ====== Stats / Bars ====== */
  .stats{ grid-template-columns: repeat(2, 1fr); gap: 18px; }
  .stat{ background: linear-gradient(180deg, var(--bg-soft), var(--bg-elev)); border:1px solid var(--border); border-radius:var(--radius); padding:16px; box-shadow: var(--shadow); }
  .stat-top{ display:flex; align-items:center; justify-content:space-between; margin-bottom:10px; font-weight:600; }
  .bar{ height:10px; background:#fff; border:1px solid var(--border); border-radius:999px; overflow:hidden; }
  .bar span{ display:block; height:100%; width:var(--w); background: linear-gradient(90deg, #3b3f46, #6b7280); }
  [data-theme="gray"] .bar{ background:#0f1115; }
  
  /* ====== News ====== */
  .news-grid{
    display:grid; grid-template-columns: repeat(3, 1fr); gap: 18px;
  }
  .news-card{ border:1px solid var(--border); border-radius:var(--radius); overflow:hidden; background: linear-gradient(180deg, var(--bg-soft), var(--bg-elev)); box-shadow: var(--shadow); }
  .news-media{ position:relative; display:block; aspect-ratio: 16 / 9; overflow:hidden; }
  .news-media img{ width:100%; height:100%; object-fit:cover; transform: scale(1); transition: transform .45s ease; }
  .news-card:hover .news-media img{ transform: scale(1.05); }
  .news-body{ padding: 14px 14px 18px; }
  .news-body h3{ margin:0 0 6px; font-size:18px; }
  .tag{
    position:absolute; left:10px; bottom:10px; font-size:12px; padding:4px 8px; border-radius:999px;
    color:#fff; background: rgba(0,0,0,.55); border:1px solid rgba(255,255,255,.35);
    -webkit-backdrop-filter: blur(3px); backdrop-filter: blur(3px);
  }
  
  /* ====== Contact ====== */
  .contact-grid{
    display:grid; grid-template-columns: .95fr 1.05fr; gap: 22px;
  }
  .contact-card, .contact-form{
    background: linear-gradient(180deg, var(--bg-soft), var(--bg-elev));
    border:1px solid var(--border); border-radius: var(--radius);
    padding: 18px; box-shadow: var(--shadow);
  }
  .contact-card h3, .contact-form h3{ margin:0 0 10px; }
  .contact-list{ list-style:none; padding:0; margin: 10px 0 0; display:grid; gap:10px; }
  .contact-list li{ display:flex; gap:10px; align-items:center; }
  .contact-list a{ color:inherit; text-decoration: underline dotted rgba(0,0,0,.35); text-underline-offset: 2px; }
  .contact-note{ margin-top:12px; }
  
  .form-row{ display:grid; grid-template-columns: 1fr 1fr; gap:12px; }
  .form-field{ display:flex; flex-direction:column; gap:6px; }
  label{ font-size:13px; color:#d6d6df; }
  input, textarea{
    background: var(--bg-soft); color: var(--text); border:1px solid var(--border);
    border-radius:10px; padding:10px 12px; outline:none;
    transition: border-color .2s ease, box-shadow .2s ease, background-color .2s ease, color .2s ease;
  }
  input::placeholder, textarea::placeholder{ color: var(--muted); }
  input:focus, textarea:focus{ border-color: rgba(0,0,0,.28); box-shadow: 0 0 0 4px rgba(0,0,0,.06); }
  /* Dark theme inputs */
  [data-theme="gray"] input, [data-theme="gray"] textarea{
    background:#0f0f12; color:#e7eaf0; border-color: #2b2f36;
  }
  [data-theme="gray"] input::placeholder, [data-theme="gray"] textarea::placeholder{ color:#9aa2b2; }
  [data-theme="gray"] input:focus, [data-theme="gray"] textarea:focus{ border-color: rgba(255,255,255,.25); box-shadow: 0 0 0 4px rgba(255,255,255,.08); }
  .form-actions{ margin-top:6px; display:flex; gap:12px; align-items:center; }
  .form-status{ font-size:14px; color: var(--muted); }
  
  /* ====== Footer ====== */
  .site-footer{
    border-top:0;
    background: linear-gradient(180deg, rgba(0,0,0,.06), rgba(0,0,0,.16)), var(--bg);
  }
  [data-theme="gray"] .site-footer{
    background: linear-gradient(180deg, rgba(255,255,255,.02), rgba(255,255,255,.00)), linear-gradient(180deg, #1f2226, #191c21);
  }
  .footer-inner{
    min-height:70px; display:flex; align-items:center; justify-content:space-between; gap:12px;
  }
  .footer-socials a{ display:inline-flex; width:44px; height:44px; align-items:center; justify-content:center; border:1px solid var(--border); border-radius:12px; background:#fff; color:#4b5563; }
  .footer-socials a i{ font-size:18px; }
  .footer-socials a:hover{ border-color: rgba(0,0,0,.18); box-shadow:0 6px 18px rgba(0,0,0,.08); }
  [data-theme="gray"] .footer-socials a{ background: transparent; color:#e7eaf0; }
  [data-theme="gray"] .footer-socials a:hover{ border-color: rgba(255,255,255,.2); box-shadow:0 6px 18px rgba(0,0,0,.3); }
  
  /* ====== Page Hero ====== */
  .page-hero{
    padding: 70px 0 34px;
    background: transparent;
    border-bottom:0;
  }
  .page-hero h1{
    font-family:Poppins, Inter, sans-serif; font-weight:800; font-size: clamp(28px, 4.4vw, 46px); margin:0 0 8px;
  }
  /* disable text selection/caret on prominent titles */
  .hero-title, .section-title, .page-hero h1{
    -webkit-user-select: none; -moz-user-select: none; -ms-user-select: none; user-select: none;
  }
  .page-hero .muted{ color:#4b5563; }
  [data-theme="gray"] .page-hero .muted{ color:#cfd4dd; }
  
  /* ====== Reveal animations ====== */
  .reveal{ opacity:0; transform: translateY(14px) scale(.98); will-change: transform, opacity; }
  .reveal.is-visible{ opacity:1; transform: none; transition: transform .7s cubic-bezier(.22,.61,.36,1), opacity .7s ease; }
  
  /* ====== Page transition overlay ====== */
  .page-transition{
    position:fixed; inset:0; z-index:2000;
    background: radial-gradient(1000px 600px at 70% -10%, rgba(0,0,0,.06), transparent 60%),
                linear-gradient(180deg, var(--bg-soft), var(--bg));
    transform: translateY(0);
    transition: transform .65s cubic-bezier(.22,.61,.36,1);
    border-bottom:1px solid var(--border);
  }
  body:not(.is-loading) .page-transition{ transform: translateY(-100%); }

  /* ====== Theme toggle button ====== */
  .theme-toggle{
    position:absolute; right:56px; top:10px; z-index:1100; /* оставляем место для бургера */
    display:inline-flex; align-items:center; justify-content:center;
    width:48px; height:48px; padding:0; border:0; background: transparent;
    border-radius:12px; cursor:pointer; transition: box-shadow .2s ease, transform .2s ease;
  }
  .theme-toggle:hover{ transform: translateY(-1px); box-shadow:0 10px 24px rgba(0,0,0,.08); }
  .theme-toggle img{ display:block; width:30px; height:30px; object-fit:contain; filter: brightness(0) saturate(100%); }
  /* В тёмной (gray) теме делаем лого белым гарантированно */
  [data-theme="gray"] .theme-toggle img{ filter: brightness(0) invert(1); }
  
  /* ====== Responsive ====== */
  @media (max-width: 1024px){
    .hero-inner{ grid-template-columns: 1fr; }
    .hero-visual{ order:-1; min-height:220px; }
    .cards-4{ grid-template-columns: repeat(2, 1fr); }
    .news-grid{ grid-template-columns: repeat(2, 1fr); }
    .contact-grid{ grid-template-columns: 1fr; }
  }
  @media (max-width: 720px){
    .nav{
      position:fixed; top:66px; left:0; right:auto; bottom:0;
      width: 75vw; max-width: 320px; height: calc(100vh - 66px);
      background: linear-gradient(180deg, var(--bg-soft), var(--bg));
      border-right:1px solid var(--border);
      transform: translateX(-110%);
      transition: transform .3s ease;
      padding:6px 8px; display:grid; gap:2px;
      z-index:1500;
    }
    .nav.is-open{ transform: translateX(0); }
    .burger{ display:block; }
    /* no-op; open handled via .nav.is-open */
    .nav .nav-link{ display:block; padding:6px 8px; font-size:15px; line-height:1.2; border-radius:8px; }
    .nav .nav-link + .nav-link{ margin-top:1px; }
    .cards-4{ grid-template-columns: 1fr; }
    .news-grid{ grid-template-columns: 1fr; }
    .form-row{ grid-template-columns: 1fr; }
    .cta-inner{ flex-direction:column; align-items:flex-start; }
    .stats{ grid-template-columns: 1fr; }
    .hero-actions .btn{ width:100%; justify-content:center; }
  }
  @media (max-width: 480px){
    .socials a{ width:42px; height:42px; border-radius:12px; }
    .socials a i{ font-size:18px; }
    .footer-socials a{ width:40px; height:40px; }
  }
  @media (prefers-reduced-motion: reduce){
    html{ scroll-behavior:auto; }
    .reveal{ opacity:1; transform:none; transition:none; }
    .page-transition{ transition: none; transform: translateY(-100%); }
  }