:root{
  --alumtin-v:5;
  --bs-font-sans-serif:"Vazirmatn","Segoe UI",Tahoma,sans-serif;
  --text:#2f3b45; --muted:#66727e; --line:rgba(150,165,178,.35);
  --steel:#566b7d; --steel-2:#8797a5; --blue:#3f6d8f;
  --acc:#e58a2e; --acc-d:#cf6d14;
  --a:#677c8d; --b:#93a2af;
  --glass:rgba(255,255,255,.66); --glass-b:rgba(255,255,255,.95);
  --shadow:0 18px 40px -24px rgba(50,70,90,.38);
  --ring:0 0 0 1px rgba(150,165,178,.28);
}
html{scroll-behavior:smooth}
body{font-family:var(--bs-font-sans-serif);font-size:1.0625rem;line-height:1.95;color:var(--text);
  text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;font-synthesis:none;
  background:
    radial-gradient(900px 520px at 85% -10%,#fff 0,transparent 60%),
    radial-gradient(800px 600px at 0 100%,#dde3e8 0,transparent 60%),
    repeating-linear-gradient(90deg,rgba(255,255,255,.35) 0 1px,transparent 1px 4px),
    linear-gradient(180deg,#f4f6f8,#e3e8ec);
  background-attachment:fixed}
h1,h2,h3,h4,.navbar-brand{letter-spacing:0}
h1,h2,h3{font-weight:800}
:focus-visible{outline:3px solid var(--acc);outline-offset:3px}
section[id],header[id]{scroll-margin-top:96px}
.stats .box,.svc,.prod,.person,.art{background:var(--glass);backdrop-filter:blur(14px) saturate(150%);-webkit-backdrop-filter:blur(14px) saturate(150%);border:1px solid var(--glass-b);box-shadow:var(--ring),var(--shadow),inset 0 1px 0 #fff}

/* ===== navbar ===== */
.navbar{position:fixed;top:0;inset-inline:0;z-index:50;padding:14px 0}
.nav-shell{position:relative;z-index:0;display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;width:100%;padding:8px 18px;border-radius:14px}
.nav-shell::before{content:"";position:absolute;inset:0;z-index:-1;border-radius:inherit;background:rgba(255,255,255,.62);backdrop-filter:blur(16px) saturate(150%);-webkit-backdrop-filter:blur(16px) saturate(150%);border:1px solid rgba(255,255,255,.95);box-shadow:var(--ring),0 14px 30px -20px rgba(50,70,90,.5)}
.navbar.scrolled .nav-shell::before{background:rgba(255,255,255,.82)}
.navbar-brand{display:flex;align-items:center;gap:10px;font-weight:900;font-size:1.5rem;color:var(--text);margin:0;padding:0}
.brand-logo{height:46px;width:auto;max-width:170px;object-fit:contain}
.brand-text span{color:var(--acc)}
.navbar-toggler{border:1px solid var(--line);border-radius:10px;padding:6px 10px}
.nav-link{position:relative;color:var(--text)!important;font-weight:600;font-size:1rem;padding:.55rem 1rem!important;border-radius:10px;transition:background .25s,color .25s}
.nav-link::after{content:"";position:absolute;inset-inline:1rem;bottom:4px;height:2px;border-radius:2px;background:var(--acc);transform:scaleX(0);transition:transform .3s}
.nav-link:hover,.nav-item.dropdown:hover>.nav-link{background:rgba(103,124,141,.12);color:var(--text)!important}
.nav-link:hover::after,.nav-item.dropdown:hover>.nav-link::after{transform:scaleX(1)}
.navbar .dropdown-toggle::after{content:"\F229";font-family:"bootstrap-icons";border:0;font-size:.7rem;margin-inline-start:.4rem;vertical-align:0;position:static;background:none;height:auto;transform:none;inset:auto}

/* dropdown / cascading menu */
.glass-menu{background:rgba(255,255,255,.9);backdrop-filter:blur(20px) saturate(160%);-webkit-backdrop-filter:blur(20px) saturate(160%);border:1px solid #fff;border-radius:14px;padding:8px;box-shadow:var(--ring),0 28px 50px -22px rgba(50,70,90,.5);min-width:250px;margin:0}
.glass-menu .dropdown-item{display:flex;align-items:center;gap:10px;color:var(--text);font-weight:600;font-size:.97rem;border-radius:10px;padding:9px 12px;white-space:normal;transition:background .2s,transform .2s}
.glass-menu .dropdown-item:hover,.glass-menu .dropdown-item:focus{background:rgba(103,124,141,.13);color:var(--text);transform:translateX(-3px)}
.mi{flex:none;width:32px;height:32px;border-radius:9px;display:grid;place-items:center;color:#fff;font-size:.95rem;background:linear-gradient(135deg,var(--a),var(--b))}
.dot::before{content:"";flex:none;width:7px;height:7px;border-radius:2px;background:var(--acc);margin-inline:5px}
.dropdown-submenu{position:relative}
.sub-toggle::after{content:"\F284";font-family:"bootstrap-icons";margin-inline-start:auto;font-size:.75rem;opacity:.65}
@media (min-width:992px){
  .navbar .dropdown>.dropdown-menu,.dropdown-submenu>.dropdown-menu{display:block;visibility:hidden;opacity:0;pointer-events:none;transition:opacity .25s,transform .25s,visibility .25s}
  .navbar .dropdown>.dropdown-menu{top:100%;inset-inline-start:0;margin-top:12px;transform:translateY(12px)}
  .navbar .dropdown>.dropdown-menu::before{content:"";position:absolute;inset:-14px 0 auto;height:14px}
  .dropdown-submenu>.dropdown-menu{top:-9px;inset-inline-start:100%;margin-inline-start:8px;transform:translateX(12px)}
  .dropdown-submenu>.dropdown-menu::before{content:"";position:absolute;inset-block:0;inset-inline-end:-10px;width:10px}
  .navbar .dropdown:hover>.dropdown-menu,.navbar .dropdown>.dropdown-menu.show,.navbar .dropdown:focus-within>.dropdown-menu,
  .dropdown-submenu:hover>.dropdown-menu,.dropdown-submenu:focus-within>.dropdown-menu{visibility:visible;opacity:1;pointer-events:auto;transform:none}
}
@media (max-width:991px){
  .navbar-collapse{background:rgba(255,255,255,.85);border-radius:12px;padding:10px;margin-top:10px}
  .navbar .dropdown-menu{position:static;box-shadow:none;background:rgba(240,243,245,.9);margin:4px 0;min-width:0}
  .dropdown-submenu>.dropdown-menu{margin:4px 12px}
}

/* ===== hero ===== */
.hero{position:relative;min-height:100vh;display:flex;align-items:center;padding:140px 0 100px;overflow:hidden}
.hero::before{content:"";position:absolute;inset-block:0;inset-inline-end:0;width:46%;background:linear-gradient(160deg,rgba(255,255,255,.8),rgba(190,200,209,.55));clip-path:polygon(20% 0,100% 0,100% 100%,0 100%);pointer-events:none}
.hero .container{position:relative;z-index:1}
.badge-pill{display:inline-flex;align-items:center;gap:8px;padding:6px 16px;border-radius:8px;font-size:.9rem;font-weight:600;color:var(--steel);background:rgba(255,255,255,.75);border:1px solid rgba(150,165,178,.4);border-inline-start:4px solid var(--acc)}
.hero h1{font-size:clamp(2.1rem,4.4vw,3.4rem);line-height:1.55;margin:22px 0;color:var(--text)}
.hero h1 em{font-style:normal;color:var(--blue);background:linear-gradient(var(--acc),var(--acc)) no-repeat 0 96%/100% 4px;padding-bottom:2px}
.hero p.lead{color:var(--muted);max-width:540px;font-size:1.13rem;line-height:2}
.btn-shop{background:linear-gradient(180deg,#ec9440,var(--acc-d));color:#fff;font-weight:800;font-size:1.12rem;padding:13px 32px;border:0;border-radius:10px;box-shadow:0 12px 22px -12px rgba(207,109,20,.8);transition:transform .2s,box-shadow .2s}
.btn-shop:hover{color:#fff;transform:translateY(-2px);box-shadow:0 16px 26px -12px rgba(207,109,20,.9)}
.btn-ghost{color:var(--text);font-weight:600;padding:13px 26px;border-radius:10px;background:rgba(255,255,255,.65);border:1px solid rgba(150,165,178,.5);transition:background .2s,transform .2s}
.btn-ghost:hover{background:#fff;color:var(--text);transform:translateY(-2px)}

.tile-wrap{position:relative;max-width:380px;margin-inline:auto}
.tile{position:relative;aspect-ratio:1;direction:ltr;padding:26px;border-radius:20px;display:flex;flex-direction:column;justify-content:space-between;overflow:hidden;color:var(--text);
  background:repeating-linear-gradient(90deg,rgba(255,255,255,.5) 0 1px,rgba(255,255,255,0) 1px 3px),linear-gradient(145deg,#fbfcfd,#c3ccd4 55%,#eef1f4);
  border:1px solid #fff;box-shadow:var(--ring),0 40px 70px -30px rgba(50,70,90,.55),inset 0 0 0 2px rgba(255,255,255,.85)}
.tile::before{content:"";position:absolute;inset:10px;border:1px solid rgba(100,120,138,.3);border-radius:12px;pointer-events:none}
.tile .no{font-size:2rem;font-weight:300}
.tile .sym{font-size:min(36vw,185px);font-weight:900;line-height:1;letter-spacing:-6px;background:linear-gradient(160deg,#7b8e9e,#44596b);-webkit-background-clip:text;background-clip:text;color:transparent}
.tile .meta{display:flex;justify-content:space-between;align-items:flex-end;font-size:1.1rem}
.tile .meta b{font-size:1.5rem}
.tile::after{content:"";position:absolute;inset:0;background:linear-gradient(105deg,transparent 35%,rgba(255,255,255,.85) 50%,transparent 65%);transform:translateX(-120%);animation:sheen 6s 1s ease-in-out infinite}
@keyframes sheen{0%{transform:translateX(-120%)}30%,100%{transform:translateX(120%)}}

/* ===== stats ===== */
.stats{margin-top:-60px;position:relative;z-index:5}
.stats .box{border-radius:14px;padding:26px 12px}
.stat b{display:block;font-size:2.4rem;font-weight:800;line-height:1.3;color:var(--steel)}
.stat span{color:var(--muted);font-size:.95rem}
@media (min-width:768px){.stat+.stat{border-inline-start:1px solid var(--line)}}

/* ===== sections ===== */
.sec{padding:96px 0}
.sec-title{font-size:clamp(1.65rem,2.8vw,2.3rem);line-height:1.6;color:var(--text)}
.sec-title::after{content:"";display:block;width:52px;height:4px;border-radius:2px;background:var(--acc);margin:12px auto 0}
.sec-sub{color:var(--muted);max-width:560px;margin-inline:auto}
.svc{position:relative;height:100%;border-radius:14px;padding:32px 28px;transition:transform .25s,box-shadow .25s;overflow:hidden}
.svc:hover,.art:hover{transform:translateY(-6px);box-shadow:var(--ring),0 30px 50px -26px rgba(50,70,90,.55),inset 0 1px 0 #fff}
.svc::before,.art::before{content:"";position:absolute;inset-inline:0;top:0;height:4px;background:linear-gradient(90deg,var(--a),var(--b));transition:background .25s}
.svc:hover::before,.art:hover::before{background:var(--acc)}
.ico{position:relative;width:56px;height:56px;border-radius:12px;display:grid;place-items:center;font-size:1.6rem;color:#fff;background:linear-gradient(135deg,var(--a),var(--b));margin-bottom:18px;box-shadow:0 12px 20px -12px rgba(50,70,90,.7)}
.svc h3{font-size:1.4rem;position:relative}
.svc ul{list-style:none;padding:0;margin:14px 0 0;color:var(--muted);font-size:1rem}
.svc li{padding:4px 0;display:flex;gap:10px}
.svc li i{color:var(--acc)}

.dark{position:relative}
.dark::before{content:"";position:absolute;inset:40px 0;background:linear-gradient(120deg,rgba(255,255,255,.55),rgba(200,208,216,.3));border-block:1px solid var(--line);pointer-events:none}
.dark .container{position:relative}
.prod{display:flex;align-items:center;gap:16px;padding:18px 20px;height:100%;border-radius:12px;transition:transform .25s,background .25s}
.prod:hover{transform:translateY(-4px);background:#fff}
.prod i{font-size:1.8rem;background:linear-gradient(135deg,var(--steel),var(--steel-2));-webkit-background-clip:text;background-clip:text;color:transparent}
.prod b{font-weight:700;font-size:1.08rem}

/* ===== articles ===== */
.art{position:relative;height:100%;display:flex;flex-direction:column;border-radius:14px;padding:28px 24px 22px;overflow:hidden;transition:transform .25s,box-shadow .25s}
.art .ico{width:48px;height:48px;border-radius:11px;font-size:1.4rem;margin-bottom:14px}
.art h3{font-size:1.18rem;line-height:1.8}
.art p{color:var(--muted);font-size:.97rem;flex:1;display:-webkit-box;-webkit-line-clamp:4;-webkit-box-orient:vertical;overflow:hidden}
.more{align-self:flex-start;border:0;background:linear-gradient(180deg,#6f8394,#52677a);color:#fff;font-weight:700;font-size:.93rem;padding:8px 18px;border-radius:8px;transition:background .2s,transform .2s}
.more:hover{color:#fff;background:linear-gradient(180deg,#ec9440,var(--acc-d));transform:translateY(-2px)}
.modal-backdrop{--bs-backdrop-bg:#cfd6dc;--bs-backdrop-opacity:.6}
.modal-content{background:rgba(255,255,255,.92);backdrop-filter:blur(20px) saturate(150%);-webkit-backdrop-filter:blur(20px) saturate(150%);border:1px solid #fff;border-radius:16px;box-shadow:var(--ring),0 40px 80px -30px rgba(50,70,90,.6);color:var(--text)}
.modal-header,.modal-footer{border-color:var(--line)}
.modal-title{font-weight:800;font-size:1.3rem;line-height:1.7}
.modal-body p{line-height:2.1}

/* ===== contact ===== */
.person{display:flex;justify-content:space-between;align-items:center;gap:12px;border-radius:12px;padding:15px 22px;margin-bottom:12px;transition:transform .2s,border-color .2s}
.person:hover{transform:translateX(-5px)}
.person b{font-weight:700}
.person small{display:block;color:var(--muted);line-height:1.5}
.person a{direction:ltr;font-weight:700;color:var(--blue);text-decoration:none;white-space:nowrap}
.person a:hover{color:var(--acc-d)}
.info{height:100%;color:var(--text);border-radius:14px;padding:34px;background:linear-gradient(135deg,rgba(255,255,255,.8),rgba(203,211,219,.75));backdrop-filter:blur(16px) saturate(150%);-webkit-backdrop-filter:blur(16px) saturate(150%);border:1px solid #fff;border-top:4px solid var(--acc);box-shadow:var(--ring),var(--shadow),inset 0 1px 0 #fff}
.info h3{font-size:1.35rem}
.info p{display:flex;gap:12px;align-items:flex-start}
.info i{font-size:1.2rem;color:var(--steel)}
.warn{background:rgba(229,138,46,.1);border:1px solid rgba(229,138,46,.4);border-radius:10px;padding:13px 16px;font-size:.95rem}
footer{background:rgba(255,255,255,.7);backdrop-filter:blur(12px);border-top:1px solid var(--line);color:var(--muted);font-size:.9rem;padding:22px 0;text-align:center}

@media (max-width:991px){
  .hero{text-align:center}.hero .lead{margin-inline:auto}
  .hero::before{display:none}
  .tile-wrap{max-width:290px;margin-top:40px}
  .sec{padding:72px 0}
}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}

/* ===== مطالب و جزوات دانشگاهی ===== */
.mat-cover{display:block;width:calc(100% + 48px);max-width:none;margin:-28px -24px 18px;aspect-ratio:8/5;object-fit:cover;background:#dfe5ea}
.mat-meta{color:var(--muted);font-size:.9rem;margin-bottom:12px}
.mat-meta i{color:var(--acc)}
.mat-hero{display:block;width:100%;height:auto;border-radius:12px;margin-bottom:18px;aspect-ratio:8/5;object-fit:cover}
.mat-gallery{display:grid;grid-template-columns:repeat(auto-fill,minmax(210px,1fr));gap:12px;margin-top:18px}
.mat-gallery img{display:block;width:100%;height:auto;border-radius:10px;border:1px solid var(--line);background:#fff}
.file-row{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;padding:10px 14px;border:1px solid var(--line);border-radius:10px;background:rgba(255,255,255,.7)}
.file-row+.file-row{margin-top:8px}
.file-row .nm{overflow-wrap:anywhere}
.file-ext{display:inline-block;direction:ltr;background:var(--steel);color:#fff;border-radius:6px;padding:0 8px;font-size:.78rem;font-weight:700;margin-inline-end:8px;line-height:1.7}

/* ===== سازگاری با موبایل ===== */
img{max-width:100%}
@media (max-width:991px){
  .navbar-collapse{max-height:calc(100vh - 110px);max-height:calc(100dvh - 110px);overflow-y:auto;-webkit-overflow-scrolling:touch}
  .nav-link{padding:.8rem 1rem!important}
  .glass-menu .dropdown-item{padding:12px}
}
@media (max-width:767px){
  body{font-size:1rem;background-attachment:scroll}
  .navbar{padding:10px 0}
  .nav-shell{padding:6px 12px}
  .navbar-brand{font-size:1.25rem}
  .brand-logo{height:38px;max-width:130px}
  .hero{min-height:auto;padding:110px 0 90px}
  .hero h1{margin:16px 0}
  .hero .btn-shop,.hero .btn-ghost{width:100%;text-align:center}
  .stats{margin-top:-44px}
  .stats .box{padding:20px 6px}
  .stat b{font-size:1.9rem}
  .sec{padding:56px 0}
  .svc{padding:24px 20px}
  .art{padding:24px 20px 20px}
  .mat-cover{width:calc(100% + 40px);margin:-24px -20px 16px}
  .person{flex-wrap:wrap}
  .info{padding:24px 20px}
  .modal-dialog{margin:.75rem}
  .modal-body{padding:1rem}
  .file-row .btn{width:100%;text-align:center}
}