:root{
  --bg:#fff;
  --ink:#071832;
  --muted:#5e6d86;
  --blue-950:#061b43;
  --blue-900:#08275c;
  --blue-800:#0b3c90;
  --blue-700:#0c55c7;
  --blue-100:#e9f1ff;
  --blue-050:#f7faff;
  --line:#dfe7f4;
  --card:#fff;
  --soft:#f4f7fc;
  --shadow:0 18px 45px rgba(8,39,92,.08);
  --radius:14px;
  --max:1380px;
  --pad:clamp(20px,4vw,64px);
  --header-h:96px;
  --font:Inter,Segoe UI,Roboto,Arial,sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--font);font-size:16px;line-height:1.5;overflow-x:hidden}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
button,input{font:inherit}
.container{width:min(100% - 2*var(--pad),var(--max));margin-inline:auto}.narrow{max-width:980px}.skip-link{position:absolute;left:-999px;top:10px;background:#fff;padding:10px;z-index:10}.skip-link:focus{left:10px}.site-header{height:var(--header-h);background:rgba(255,255,255,.96);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20;backdrop-filter:blur(10px)}.header-inner{height:100%;display:grid;grid-template-columns:260px 1fr auto;align-items:center;gap:32px}.logo-link{width:235px}.logo{width:235px;height:auto}.main-nav{display:flex;justify-content:center;gap:42px;align-items:center}.nav-link{font-weight:800;color:#101d35;position:relative;padding:36px 0}.nav-link::after{content:"";position:absolute;left:0;right:0;bottom:26px;height:2px;background:var(--blue-700);transform:scaleX(0);transition:.2s}.nav-link:hover,.nav-link.is-active{color:var(--blue-800)}.nav-link.is-active::after,.nav-link:hover::after{transform:scaleX(1)}.header-actions{display:flex;align-items:center;gap:18px}.search-button{display:inline-flex;gap:9px;align-items:center;border:0;background:transparent;color:var(--blue-950);font-weight:800;cursor:pointer;padding:10px}.search-button svg{width:25px;height:25px;fill:none;stroke:currentColor;stroke-width:2}.button{display:inline-flex;align-items:center;justify-content:center;gap:10px;border-radius:6px;border:1px solid var(--blue-800);min-height:44px;padding:0 28px;font-weight:900;cursor:pointer;transition:.2s}.button-primary{background:linear-gradient(180deg,#0d56cc,#083b91);color:#fff;box-shadow:0 6px 12px rgba(12,85,199,.16)}.button-primary:hover{transform:translateY(-1px);box-shadow:0 10px 18px rgba(12,85,199,.22)}.button-outline{background:#fff;color:var(--blue-800)}.button-outline:hover{background:var(--blue-050)}.menu-toggle{display:none;width:42px;height:42px;border:1px solid var(--line);border-radius:8px;background:#fff;cursor:pointer;padding:9px}.menu-toggle span{display:block;height:2px;background:var(--blue-950);margin:6px 0;border-radius:4px}.page-shell{min-height:calc(100vh - var(--header-h));display:flex;flex-direction:column}.page-main{flex:1}.page-hero{position:relative;padding:46px 0 42px;border-bottom:1px solid var(--line);overflow:hidden}.page-hero::after{content:"";position:absolute;inset:0 0 0 auto;width:55%;background:repeating-radial-gradient(ellipse at 70% 50%,rgba(12,85,199,.16) 0 1px,transparent 1px 10px);mask:linear-gradient(90deg,transparent 0,#000 35%,transparent 100%);opacity:.7;pointer-events:none}.breadcrumbs{position:relative;z-index:1;display:flex;gap:10px;align-items:center;color:var(--blue-700);font-size:13px;font-weight:800;margin-bottom:20px}.breadcrumbs span{color:#8b98ad}.page-hero h1,.hero h1{margin:0;color:var(--blue-950);letter-spacing:-.04em;line-height:1.1}.page-hero h1{font-size:clamp(42px,4.5vw,62px)}.page-hero p{position:relative;z-index:1;max-width:650px;color:var(--muted);font-size:19px;margin:18px 0 0}.eyebrow{text-transform:uppercase;color:var(--blue-700);font-weight:900;font-size:13px;letter-spacing:.08em;margin:0 0 12px}.lead{font-size:19px;color:var(--muted);max-width:580px}.section{padding:46px 0}.section-tight{padding:26px 0}.section-title{font-size:28px;line-height:1.2;color:var(--blue-950);margin:0 0 24px}.section-head{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-bottom:20px}.text-link{display:inline-flex;align-items:center;gap:10px;color:var(--blue-700);font-weight:900}.text-link svg{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:2}.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius)}.soft-card{background:linear-gradient(180deg,#fff,#f8fbff);border:1px solid var(--line);border-radius:var(--radius)}.hero{position:relative;overflow:hidden;border-bottom:1px solid var(--line)}.hero::before,.wave-bg::before{content:"";position:absolute;inset:0;background:repeating-radial-gradient(ellipse at 80% 50%,rgba(12,85,199,.18) 0 1px,transparent 1px 11px);mask:linear-gradient(90deg,transparent 0,#000 45%,transparent 100%);opacity:.55;pointer-events:none}.hero-grid{min-height:350px;display:grid;grid-template-columns:minmax(380px,520px) 1fr;gap:48px;align-items:center;padding:54px 0}.hero h1{font-size:clamp(38px,4vw,58px)}.hero-actions{display:flex;gap:28px;align-items:center;flex-wrap:wrap;margin-top:28px}.hero-visual{position:relative;min-height:315px}.wave-line{position:absolute;left:0;right:-6%;top:45%;height:90px;background:linear-gradient(90deg,transparent 0 5%,rgba(12,85,199,.4) 5% 100%);clip-path:polygon(0 51%,9% 51%,12% 43%,15% 59%,20% 28%,25% 72%,31% 35%,37% 64%,45% 42%,54% 59%,62% 38%,70% 67%,76% 30%,82% 74%,88% 44%,100% 51%,100% 57%,0 57%)}.device-illustration{position:absolute;right:14%;top:18%;width:190px;height:190px;border-radius:50%;background:radial-gradient(circle at 30% 28%,#5f83bf,#0b2558 70%);box-shadow:0 24px 60px rgba(8,39,92,.18)}.device-illustration span{position:absolute;border-radius:50%;background:#071832;border:8px solid rgba(255,255,255,.25)}.device-illustration span:nth-child(1){width:70px;height:70px;left:25px;top:34px}.device-illustration span:nth-child(2){width:66px;height:66px;right:25px;top:40px}.device-illustration span:nth-child(3){width:78px;height:78px;left:55px;bottom:24px}.mic-stand{position:absolute;left:18%;top:18%;width:120px;height:240px}.mic-stand::before{content:"";position:absolute;left:32px;top:0;width:70px;height:58px;border-radius:50%;background:radial-gradient(circle,#5d6d85,#101d35 70%)}.mic-stand::after{content:"";position:absolute;left:64px;top:58px;width:9px;height:160px;background:#101d35;box-shadow:-34px 158px 0 8px #101d35;border-radius:20px}.article-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}.article-grid.compact{grid-template-columns:repeat(3,1fr)}.article-card{overflow:hidden;background:#fff;border:1px solid var(--line);border-radius:10px;transition:.2s}.article-card:hover{transform:translateY(-2px);box-shadow:var(--shadow)}.thumb{height:145px;position:relative;background:#eef4ff;overflow:hidden}.thumb::before,.thumb::after{content:"";position:absolute;inset:0}.thumb-wave::before{background:repeating-linear-gradient(90deg,rgba(12,85,199,.08) 0 12px,transparent 12px 24px),linear-gradient(135deg,#bfd9ff,#f5f9ff)}.thumb-wave::after{top:40%;height:50px;background:linear-gradient(90deg,transparent,rgba(12,85,199,.75),transparent);clip-path:polygon(0 50%,8% 25%,13% 58%,18% 15%,25% 80%,31% 34%,39% 66%,46% 38%,54% 60%,62% 22%,70% 76%,80% 45%,100% 52%,100% 58%,0 58%)}.thumb-test::before{background:linear-gradient(135deg,#f7f8fb,#cfd8e7)}.thumb-test::after{left:35%;top:20%;width:76px;height:76px;border:12px solid #253a5f;border-radius:50%;box-shadow:-38px 42px 0 -12px #0b3c90,48px 34px 0 -14px #6c7687}.thumb-device::before{background:linear-gradient(135deg,#e9eef6,#9fb5d3)}.thumb-device::after{left:42%;top:18%;width:68px;height:84px;border-radius:8px;background:#0b3c90;box-shadow:inset 0 0 0 8px rgba(255,255,255,.22)}.thumb-acoustic::before{background:repeating-radial-gradient(circle at 20% 45%,#102b5e 0 6px,#071832 6px 18px)}.thumb-history::before{background:linear-gradient(135deg,#d1d5db,#8a8f99)}.thumb-history::after{left:34%;top:20%;width:64px;height:84px;border-radius:50% 50% 42% 42%;background:#3d4149}.thumb-event::before{background:linear-gradient(160deg,#1b1f2a,#101f48 70%)}.thumb-event::after{inset:24px 18px auto 18px;height:54px;border-radius:3px;background:linear-gradient(90deg,#fff,#8bb4ff)}.thumb-gallery::before{background:linear-gradient(135deg,#d9e3f3,#f8fbff)}.thumb-gallery::after{left:25px;top:28px;width:140px;height:90px;border-radius:8px;background:#0b3c90;box-shadow:38px 16px 0 -4px #7fa7e8}.card-body{padding:14px}.category{margin:0 0 8px;color:var(--blue-700);font-size:12px;text-transform:uppercase;font-weight:900;letter-spacing:.07em}.article-card h2{font-size:18px;line-height:1.25;margin:0 0 12px;color:var(--ink)}.meta{display:flex;gap:18px;flex-wrap:wrap;color:var(--muted);font-size:13px}.meta span.time::before{content:"◷ ";color:#8a99af}.feature-grid{display:grid;grid-template-columns:repeat(4,1fr);border:1px solid var(--line);border-radius:10px;overflow:hidden;background:#fff}.feature-item{padding:24px;display:grid;grid-template-columns:48px 1fr;gap:16px;align-items:center;border-right:1px solid var(--line)}.feature-item:last-child{border-right:0}.feature-item h3{margin:0 0 5px;font-size:17px}.feature-item p{margin:0;color:var(--muted);font-size:14px}.icon-box,.rubric-icon{width:46px;height:46px;border:2px solid var(--blue-700);border-radius:14px;display:inline-grid;place-items:center;color:var(--blue-700);position:relative}.icon-box::before,.rubric-icon::before{content:"";width:22px;height:22px;border:2px solid currentColor;border-radius:5px}.icon-wave::before{border:0;border-radius:0;background:currentColor;height:20px;clip-path:polygon(0 54%,12% 54%,18% 20%,26% 88%,35% 8%,45% 82%,54% 30%,64% 66%,78% 48%,100% 54%,100% 62%,0 62%)}.icon-press::before{border-radius:0;border-width:0 0 3px 0;box-shadow:0 -18px 0 -8px currentColor}.icon-gauge::before{border-radius:50%;clip-path:polygon(0 0,100% 0,100% 55%,0 55%)}.icon-mic::before{border-radius:12px 12px 6px 6px}.icon-book::before{border-radius:2px;box-shadow:10px 0 0 -6px currentColor}.icon-calendar::before{border-radius:4px}.icon-shield::before{clip-path:polygon(50% 0,100% 18%,88% 80%,50% 100%,12% 80%,0 18%)}.icon-target::before{border-radius:50%;box-shadow:inset 0 0 0 5px #fff}.icon-users::before{border-radius:50% 50% 6px 6px}.icon-folder::before{border-radius:3px}.rubric-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}.rubric-card{min-height:190px;padding:24px;border:1px solid var(--line);border-radius:12px;background:#fff;display:flex;flex-direction:column;align-items:flex-start;gap:14px}.rubric-card strong{font-size:22px;color:var(--blue-950)}.rubric-card p{margin:0;color:var(--muted)}.rubric-card small{margin-top:auto;color:var(--blue-700);font-weight:900}.filters{display:flex;gap:12px;flex-wrap:wrap;margin-bottom:22px}.filter-pill{border:1px solid var(--line);border-radius:8px;background:#fff;padding:11px 22px;font-weight:800;color:var(--blue-800)}.filter-pill.active{background:var(--blue-800);color:#fff}.issue-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:18px}.issue-card{display:grid;grid-template-columns:118px 1fr;gap:18px;padding:16px;min-height:178px}.cover{height:150px;border-radius:4px;background:linear-gradient(165deg,#fff 0 28%,#0b3c90 28% 100%);border:1px solid var(--line);box-shadow:0 8px 18px rgba(8,39,92,.12);display:flex;flex-direction:column;justify-content:space-between;color:#fff;padding:12px;font-weight:900;position:relative;overflow:hidden}.cover::before{content:"АКУСТИКА\A ВИБРАЦИЯ";white-space:pre;position:absolute;top:15px;left:10px;color:var(--blue-800);font-size:13px;line-height:1.1}.cover::after{content:"";position:absolute;left:-20px;right:-20px;top:54%;height:50px;background:rgba(255,255,255,.35);clip-path:polygon(0 51%,10% 48%,14% 20%,22% 86%,30% 34%,40% 70%,54% 44%,62% 64%,70% 25%,80% 82%,88% 42%,100% 55%,100% 60%,0 60%)}.cover span{margin-top:auto;z-index:1;font-size:22px}.issue-card h2{font-size:20px;margin:0 0 8px}.issue-card p{margin:0 0 12px;color:var(--muted)}.issue-actions{display:grid;gap:9px}.issue-detail{display:grid;grid-template-columns:440px 1fr;gap:72px;align-items:start}.big-cover{height:520px;border-radius:7px;padding:26px}.big-cover::before{font-size:36px;left:28px;top:38px}.big-cover span{font-size:58px}.facts{display:grid;grid-template-columns:140px 1fr;gap:8px 24px;margin-bottom:24px}.facts dt{color:var(--muted)}.facts dd{margin:0;font-weight:800}.toc-table{width:100%;border-collapse:collapse}.toc-table th,.toc-table td{text-align:left;border-bottom:1px solid var(--line);padding:14px 8px}.toc-table th{font-size:13px;color:var(--muted);font-weight:900}.toc-table a{color:var(--blue-700);font-weight:900}.article-layout{display:grid;grid-template-columns:minmax(0,1fr) 340px;gap:52px;align-items:start}.article-page h1{font-size:clamp(36px,3.7vw,56px);line-height:1.08;letter-spacing:-.04em;margin:8px 0 18px}.article-meta{display:flex;gap:28px;flex-wrap:wrap;color:var(--blue-900);font-weight:800;margin:18px 0}.article-hero-img{height:300px;border-radius:8px;overflow:hidden;margin:20px 0}.article-lead{font-size:20px;font-style:italic;color:#2d3b55;margin:0 0 26px}.article-content h2{font-size:30px;margin:30px 0 10px}.article-content h3{font-size:22px;margin:22px 0 8px}.article-content p{margin:0 0 14px}.article-tools{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:20px 0}.tool-card{padding:16px;display:flex;align-items:center;justify-content:space-between}.data-table{overflow-x:auto;margin:20px 0}.data-table table{width:100%;border-collapse:collapse;min-width:640px}.data-table th{background:var(--blue-950);color:#fff}.data-table th,.data-table td{border:1px solid var(--line);padding:11px;text-align:left}.aside-card{padding:22px;margin-bottom:14px}.quote{font-size:17px;font-weight:800;color:var(--blue-950)}.quote::before{content:"“";font-size:46px;color:var(--blue-700);line-height:0}.big-number strong{display:block;font-size:42px;color:var(--blue-800);line-height:1}.device-card{display:grid;grid-template-columns:96px 1fr;gap:16px;align-items:center}.device-mini{height:110px;border-radius:8px;background:linear-gradient(135deg,#dbe4f2,#fff);display:grid;place-items:center}.device-mini::before{content:"";width:58px;height:78px;border-radius:10px;background:#0b3c90;box-shadow:inset 0 0 0 9px rgba(255,255,255,.22)}.contacts-grid{display:grid;grid-template-columns:1fr 1fr;gap:34px;padding:34px}.contact-list{list-style:none;margin:22px 0 0;padding:0;display:grid;gap:13px}.contact-list li{display:flex;gap:12px;align-items:flex-start;font-weight:800;color:var(--blue-900)}.contact-icon{width:22px;height:22px;border:2px solid var(--blue-700);border-radius:6px;flex:0 0 auto}.authors-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}.author-card{padding:18px;display:grid;grid-template-columns:108px 1fr;gap:16px;align-items:center}.avatar{width:108px;height:108px;border-radius:8px;background:linear-gradient(180deg,#f1f3f6,#d8dde5);position:relative;overflow:hidden}.avatar::before{content:"";position:absolute;left:31px;top:18px;width:45px;height:45px;border-radius:50%;background:#aeb6c2}.avatar::after{content:"";position:absolute;left:18px;bottom:-8px;width:72px;height:56px;border-radius:50% 50% 0 0;background:#9ea8b6}.author-card h3{margin:0 0 8px;font-size:18px;color:var(--blue-800)}.author-card p{margin:0 0 8px}.reader-layout{display:grid;grid-template-columns:300px 1fr 220px;min-height:calc(100vh - var(--header-h) - 72px);border-top:1px solid var(--line)}.reader-panel{border-right:1px solid var(--line);background:#fff;padding:20px}.reader-panel.right{border-right:0;border-left:1px solid var(--line)}.reader-title{font-weight:900;margin:0 0 18px;color:var(--blue-950)}.reader-toc{list-style:none;margin:0;padding:0;display:grid;gap:8px}.reader-toc li{padding:12px;border-radius:8px}.reader-toc li.active{background:var(--blue-100)}.reader-toc a{display:grid;grid-template-columns:34px 1fr;gap:10px;color:var(--blue-900);font-weight:800}.reader-main{background:#f6f8fc;padding:28px;display:flex;flex-direction:column;align-items:center}.reader-toolbar{width:100%;height:42px;display:flex;justify-content:center;gap:28px;align-items:center;border-bottom:1px solid var(--line);margin:-28px -28px 24px;background:#fff}.pdf-page{width:min(100%,520px);aspect-ratio:0.72;background:#fff;box-shadow:0 12px 32px rgba(8,39,92,.14);padding:36px;display:grid;grid-template-rows:auto 1fr auto}.pdf-logo{width:330px;margin:50px auto 30px}.pdf-blue{background:linear-gradient(180deg,#07337a,#071832);border-radius:4px;position:relative;overflow:hidden}.pdf-blue::before{content:"";position:absolute;left:-10%;right:-10%;top:42%;height:130px;background:rgba(255,255,255,.34);clip-path:polygon(0 50%,8% 25%,13% 58%,18% 15%,25% 80%,31% 34%,39% 66%,46% 38%,54% 60%,62% 22%,70% 76%,80% 45%,100% 52%,100% 58%,0 58%)}.thumb-list{display:grid;gap:16px}.page-thumb{height:140px;border:1px solid var(--line);background:#fff;border-radius:4px}.page-thumb.active{border:3px solid var(--blue-700)}.stub-page{min-height:calc(100vh - var(--header-h));display:grid;place-items:center;position:relative;overflow:hidden}.stub-page::before,.stub-page::after{content:"";position:absolute;width:52%;height:52%;background:repeating-radial-gradient(ellipse at 50% 50%,rgba(12,85,199,.15) 0 1px,transparent 1px 10px);opacity:.8}.stub-page::before{left:-14%;bottom:-10%;transform:rotate(15deg)}.stub-page::after{right:-10%;top:16%;transform:rotate(-10deg)}.stub-inner{text-align:center;position:relative;z-index:1;width:min(780px,calc(100% - 40px));padding:50px 0}.stub-logo{width:460px;margin:0 auto 40px}.stub-inner h1{letter-spacing:.14em;font-size:44px;color:var(--blue-950);margin:0 0 24px}.stub-inner p{font-size:20px;color:var(--blue-950);margin:0 auto 20px}.stub-contacts{display:grid;gap:8px;margin:26px 0;font-size:22px;color:var(--blue-700);font-weight:900}.site-footer{border-top:1px solid var(--line);padding:22px 0 28px;color:var(--muted);font-size:14px}.footer-grid{display:grid;grid-template-columns:1.2fr 1fr 1fr 1.25fr;gap:34px;align-items:start}.site-footer p{margin:0}.site-footer nav{display:flex;gap:28px;flex-wrap:wrap}.site-footer a{color:var(--blue-900)}.site-footer address{font-style:normal}.legal-note{text-align:center;border-top:1px solid var(--line);margin-top:18px;padding-top:18px;color:var(--blue-900)}
@media (max-width:1180px){:root{--header-h:84px}.header-inner{grid-template-columns:220px 1fr auto;gap:18px}.logo-link,.logo{width:210px}.main-nav{gap:24px}.header-submit{display:none}.article-grid,.article-grid.compact{grid-template-columns:repeat(2,1fr)}.issue-grid{grid-template-columns:repeat(2,1fr)}.rubric-grid{grid-template-columns:repeat(2,1fr)}.feature-grid{grid-template-columns:repeat(2,1fr)}.feature-item:nth-child(2){border-right:0}.feature-item:nth-child(-n+2){border-bottom:1px solid var(--line)}.issue-detail,.article-layout{grid-template-columns:1fr}.authors-grid{grid-template-columns:repeat(2,1fr)}.reader-layout{grid-template-columns:260px 1fr}.reader-panel.right{display:none}.hero-grid{grid-template-columns:1fr 1fr}}
@media (max-width:820px){:root{--pad:20px;--header-h:76px}.header-inner{grid-template-columns:180px 1fr auto}.logo-link,.logo{width:174px}.menu-toggle{display:block}.search-button span{display:none}.main-nav{position:fixed;left:0;right:0;top:var(--header-h);display:none;background:#fff;border-bottom:1px solid var(--line);padding:14px 20px;box-shadow:0 20px 40px rgba(8,39,92,.12);flex-direction:column;align-items:stretch;gap:0}.main-nav.is-open{display:flex}.nav-link{padding:15px 0;border-bottom:1px solid var(--line)}.nav-link::after{display:none}.hero-grid{grid-template-columns:1fr;min-height:auto;padding:38px 0}.hero-visual{min-height:210px;order:-1}.hero h1,.page-hero h1{font-size:34px}.lead,.page-hero p{font-size:16px}.article-card{display:grid;grid-template-columns:38% 1fr}.thumb{height:100%;min-height:128px}.feature-grid,.rubric-grid,.footer-grid,.contacts-grid,.authors-grid{grid-template-columns:1fr}.feature-item,.feature-item:nth-child(2){border-right:0;border-bottom:1px solid var(--line)}.feature-item:last-child{border-bottom:0}.issue-grid{grid-template-columns:1fr}.issue-card{grid-template-columns:110px 1fr}.big-cover{height:420px}.article-tools{grid-template-columns:1fr}.article-hero-img{height:220px}.reader-layout{display:block}.reader-panel{display:none}.reader-main{min-height:calc(100vh - var(--header-h) - 80px);padding:18px}.pdf-page{width:min(100%,420px)}.site-footer nav{display:block}.site-footer nav a{display:block;margin-bottom:8px}.stub-logo{width:320px}.stub-inner h1{font-size:32px}}
@media (max-width:520px){.header-inner{grid-template-columns:154px 1fr auto;gap:8px}.logo-link,.logo{width:150px}.header-actions{gap:6px}.button{width:100%;min-height:48px}.hero-actions .text-link{width:100%;justify-content:center}.article-card{grid-template-columns:1fr}.thumb{height:150px}.section-head{align-items:flex-start;flex-direction:column}.issue-card{grid-template-columns:1fr}.cover{width:140px}.contacts-grid{padding:22px}.author-card{grid-template-columns:88px 1fr}.avatar{width:88px;height:88px}.stub-contacts{font-size:18px}.stub-inner p{font-size:16px}}


/* ==== Real image and icon assets override ==== */
.hero-visual{background:url("../img/hero-acoustic-lab.png") center/cover no-repeat;border-radius:18px;min-height:315px;box-shadow:0 12px 32px rgba(8,39,92,.12);overflow:hidden}
.hero-visual > *{display:none !important}
.thumb{background-size:cover;background-position:center}
.thumb::before,.thumb::after,.icon-box::before,.rubric-icon::before,.cover::before,.cover::after,.device-mini::before,.avatar::before,.avatar::after{display:none !important;content:none !important}
.thumb-wave{background-image:url("../img/thumb-waveform.png");background-position:center;}
.thumb-test{background-image:url("../img/thumb-test-rig.png");background-position:center;}
.thumb-device{background-image:url("../img/thumb-device-meter.png");background-position:center;}
.thumb-acoustic{background-image:url("../img/thumb-acoustic-chamber.png");background-position:center;}
.thumb-history{background-image:url("../img/thumb-history.png");background-position:center top;}
.thumb-event{background-image:url("../img/thumb-conference.png");background-position:center;}
.thumb-gallery{background-image:url("../img/thumb-waveform.png");background-position:center;}
.article-hero-img{background-image:url("../img/article-hero-vibration.png") !important;background-size:cover;background-position:center;}
.device-mini{background:url("../img/thumb-device-meter.png") center/cover no-repeat;}
.icon-box,.rubric-icon{background:#fff center/22px 22px no-repeat;border:1px solid rgba(11,86,204,.16);box-shadow:0 6px 18px rgba(11,86,204,.08)}
.icon-wave{background-image:url("../img/icons/icon-wave.svg");}
.icon-press{background-image:url("../img/icons/icon-press.svg");}
.icon-gauge{background-image:url("../img/icons/icon-gauge.svg");}
.icon-mic{background-image:url("../img/icons/icon-mic.svg");}
.icon-book{background-image:url("../img/icons/icon-book.svg");}
.icon-calendar{background-image:url("../img/icons/icon-calendar.svg");}
.icon-gallery{background-image:url("../img/icons/icon-gallery.svg");}
.icon-shield{background-image:url("../img/icons/icon-shield.svg");}
.icon-target{background-image:url("../img/icons/icon-target.svg");}
.icon-users{background-image:url("../img/icons/icon-users.svg");}
.icon-folder{background-image:url("../img/icons/icon-folder.svg");}
.contact-icon{background:#fff url("../img/icons/icon-contact.svg") center/20px 20px no-repeat;border:0;border-radius:50%;box-shadow:0 3px 8px rgba(11,86,204,.12)}
.issue-grid .cover{background:url("../img/issue-cover-generic.png") center/cover no-repeat;position:relative;color:#fff;padding:0;display:block}
.issue-grid .cover span{position:absolute;right:10px;bottom:12px;background:rgba(12,60,144,.88);border:1px solid rgba(255,255,255,.35);padding:8px 10px;border-radius:6px;font-size:18px;line-height:1.05;box-shadow:0 6px 14px rgba(0,0,0,.18)}
.issue-detail .big-cover{background:url("../img/issue-cover-2025-1.png") center/cover no-repeat;padding:0}
.issue-detail .big-cover span{display:none}
.pdf-page{background:url("../img/issue-cover-2025-1.png") center/cover no-repeat;padding:0;box-shadow:0 12px 32px rgba(8,39,92,.14)}
.pdf-page > *{display:none !important}
.page-thumb{background-size:cover;background-position:center;background-repeat:no-repeat}
.page-thumb:nth-child(1){background-image:url("../img/reader-thumb-1.png");border:3px solid var(--blue-700);}
.page-thumb:nth-child(2){background-image:url("../img/reader-thumb-2.png");}
.page-thumb:nth-child(3){background-image:url("../img/reader-thumb-3.png");}
.page-thumb:nth-child(4){background-image:url("../img/reader-thumb-4.png");}
.author-card .avatar{background-size:cover;background-position:center;border:1px solid var(--line)}
.authors-grid .author-card:nth-child(1) .avatar{background-image:url("../img/avatars/author-victoria.jpg");}
.authors-grid .author-card:nth-child(2) .avatar{background-image:url("../img/avatars/author-lyudmila.jpg");}
.authors-grid .author-card:nth-child(3) .avatar{background-image:url("../img/avatars/author-vladislav.jpg");}
.authors-grid .author-card:nth-child(4) .avatar{background-image:url("../img/avatars/author-roman.jpg");}
.search-button svg{display:none}
.search-button::before{content:"";width:22px;height:22px;display:inline-block;background:url("../img/icons/icon-search.svg") center/contain no-repeat}
@media (max-width:820px){.hero-visual{min-height:220px}}

/* Polished issue cards: larger previews, airier layout, bottom-aligned horizontal actions */
.issue-grid{
  grid-template-columns:repeat(auto-fit,minmax(380px,1fr));
  gap:28px;
  align-items:stretch;
}
.issue-card.card{
  position:relative;
  display:grid;
  grid-template-columns:172px minmax(0,1fr);
  gap:24px;
  min-height:276px;
  padding:24px;
  border-radius:18px;
  background:linear-gradient(180deg,#fff 0%,#fbfdff 100%);
  box-shadow:0 14px 34px rgba(8,39,92,.07);
  transition:transform .2s ease,box-shadow .2s ease,border-color .2s ease;
}
.issue-card.card:hover{
  transform:translateY(-3px);
  border-color:#bfd3f5;
  box-shadow:0 22px 46px rgba(8,39,92,.12);
}
.issue-card .cover{
  width:172px;
  height:228px;
  border-radius:10px;
  box-shadow:0 14px 26px rgba(8,39,92,.14);
}
.issue-grid .cover span{
  right:12px;
  bottom:14px;
  padding:9px 11px;
  border-radius:8px;
  font-size:19px;
}
.issue-card > div:last-child{
  display:flex;
  min-width:0;
  flex-direction:column;
}
.issue-card h2{
  margin:2px 0 14px;
  font-size:23px;
  line-height:1.18;
  letter-spacing:-.02em;
  color:var(--blue-950);
}
.issue-card p{
  margin:0;
  color:#5b6c86;
  font-size:16px;
  line-height:1.55;
}
.issue-actions{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:10px;
  margin-top:auto;
  padding-top:22px;
}
.issue-actions .button{
  width:auto;
  min-height:42px;
  padding:0 14px;
  border-radius:9px;
  font-size:15px;
  white-space:nowrap;
}
.issue-actions .button-primary{
  box-shadow:none;
}
.filters{
  gap:12px;
}
.filter-pill{
  border-radius:9px;
}
.section-head{
  margin-bottom:30px;
}

@media (max-width:1180px){
  .issue-grid{grid-template-columns:repeat(2,minmax(0,1fr));}
}
@media (max-width:820px){
  .issue-grid{grid-template-columns:1fr;gap:22px;}
  .issue-card.card{grid-template-columns:150px minmax(0,1fr);min-height:244px;padding:20px;gap:20px;}
  .issue-card .cover{width:150px;height:202px;}
}
@media (max-width:520px){
  .issue-card.card{grid-template-columns:1fr;}
  .issue-card .cover{width:min(210px,100%);height:280px;margin-inline:auto;}
  .issue-actions{grid-template-columns:1fr 1fr;}
  .issue-actions .button{padding:0 10px;font-size:14px;}
}