/* ==========================================================================
   PREMIUM LAYER — header / menus / dark-mode switch / papers tabs
   Loaded AFTER style_en.css. Non-destructive overrides only.
   ========================================================================== */

:root{
  --px-primary:#57b2df;
  --px-primary-2:#46b4e5;
  --px-primary-dark:#084e83;
  --px-accent:#f59e0b;
  --px-ink:#0f172a;
  --px-muted:#64748b;
  --px-bg:#f1f5f9;
  --px-card:#ffffff;
  --px-border:#e2e8f0;
  --px-border-soft:#eef2f7;
  --px-shadow-sm:0 1px 2px rgba(15,23,42,.06);
  --px-shadow-md:0 8px 24px -8px rgba(15,23,42,.16);
  --px-shadow-lg:0 20px 50px -12px rgba(2,132,199,.28);
  --px-radius:14px;
  --px-header-h:76px;
  --px-nav-h:60px;
  --px-ease:cubic-bezier(.22,.8,.28,1);
}

body.dark-theme{
  --px-ink:#e8eef5;
  --px-muted:#9aa7b8;
  --px-bg:#14181f;
  --px-card:#1e242e;
  --px-border:#2c3442;
  --px-border-soft:#28303d;
  --px-shadow-sm:0 1px 2px rgba(0,0,0,.4);
  --px-shadow-md:0 12px 28px -10px rgba(0,0,0,.55);
  --px-shadow-lg:0 20px 50px -12px rgba(0,0,0,.6);
}

/* --------------------------------------------------------------------------
   1) TOP UTILITY BAR (.coloredline)
   -------------------------------------------------------------------------- */
.coloredline{
  background:linear-gradient(90deg,#083a5e 0%,#0b6cb4 45%,#0ea5e9 100%) !important;
  height:40px !important;
  display:flex !important;
  align-items:center !important;
  border-bottom:1px solid rgba(255,255,255,.14) !important;
  box-shadow:inset 0 -1px 0 rgba(255,255,255,.08);
}
.coloredline > div:first-child{width:100%;max-width:1250px;margin:0 auto;display:flex;align-items:center;justify-content:flex-end;padding:0 20px}
.coloredline ul.socials{margin:0 !important;padding:0 !important;display:flex !important;gap:6px !important;align-items:center}
.coloredline ul.socials li{list-style:none}
.coloredline a.sociallinkicon{
  width:28px;height:28px;display:inline-flex !important;align-items:center;justify-content:center;
  border-radius:999px !important;color:#eaf6ff !important;font-size:12px !important;
  background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.18);
  transition:all .22s var(--px-ease);backdrop-filter:blur(6px);
}
.coloredline a.sociallinkicon:hover{background:#fff !important;color:#0b6cb4 !important;transform:translateY(-1px);box-shadow:0 4px 12px rgba(0,0,0,.22)}
.coloredline .top_subheader{display:none !important;}

/* --------------------------------------------------------------------------
   2) SUB-HEADER (logo + contact) — premium masthead
   -------------------------------------------------------------------------- */
.subheader_wrapper{
  background:var(--px-card) !important;
  background-image:none !important;
  height:auto !important;min-height:var(--px-header-h);
  line-height:1.4 !important;display:flex !important;align-items:center !important;
  border-bottom:1px solid var(--px-border-soft) !important;
  position:relative;z-index:50;
}
.subheader_wrapper::after{
  content:"";position:absolute;left:0;right:0;bottom:-1px;height:1px;
  background:linear-gradient(90deg,transparent,rgba(14,165,233,.35),transparent);
  pointer-events:none;
}
/* override legacy floats with a real layout */
.subheader_wrapper .left-header,
.subheader_wrapper .right-header{
  float:none !important;margin:0 !important;position:static !important;
  display:flex !important;align-items:center !important;gap:14px !important;
}
.subheader_wrapper .left-header{order:2;margin-left:auto !important}
.subheader_wrapper .right-header{order:1}
.subheader_wrapper .logos_title{display:flex !important;align-items:center !important;gap:14px !important}
.subheader_wrapper .logos_title img.logo2,
.logos_title img{
  width:auto !important;height:52px !important;max-height:52px !important;object-fit:contain;
  margin:0 !important;/*! filter:drop-shadow(0 2px 6px rgba(11,108,180,.18)); */
}
.subheader_wrapper .maintitle{
  font-size:19px !important;font-weight:800 !important;letter-spacing:-.01em !important;
  color:var(--px-ink) !important;margin:0 !important;line-height:1.15 !important;
}
.subheader_wrapper .maintitle small,
.subheader_wrapper .journal-sub{
  display:block;font-size:11.5px !important;font-weight:600 !important;letter-spacing:.14em;
  text-transform:uppercase;color:var(--px-muted) !important;
}
.subheader_wrapper .left-header a{
  display:inline-flex !important;align-items:center !important;gap:7px !important;
  font-size:12.5px !important;font-weight:600 !important;color:var(--px-muted) !important;
  background:var(--px-bg);border:1px solid var(--px-border);
  padding:7px 12px !important;border-radius:999px !important;margin:0 !important;
  transition:all .2s var(--px-ease);text-decoration:none !important;white-space:nowrap;
}
.subheader_wrapper .left-header a i{font-size:12px !important;color:var(--px-primary-2) !important;margin:0 !important}
.subheader_wrapper .left-header a:hover{border-color:var(--px-primary-2);color:var(--px-primary) !important;background:#fff;box-shadow:var(--px-shadow-sm);transform:translateY(-1px)}
body.dark-theme .subheader_wrapper .left-header a:hover{background:#242c38}

/* --------------------------------------------------------------------------
   3) STICKY PREMIUM NAV  (.header_wrapper / .menu_container / #nav)
   -------------------------------------------------------------------------- */
.header_wrapper{
  position:sticky !important;top:0;z-index:200;
  background:rgba(249, 249, 249, 0.97) !important;backdrop-filter:blur(14px) saturate(1.2);
  -webkit-backdrop-filter:blur(14px) saturate(1.2);
  border-bottom:1px solid var(--px-border) !important;
  box-shadow:0 6px 24px -12px rgba(15,23,42,.18);
}
body.dark-theme .header_wrapper{background:rgba(24,29,38,.88) !important}
.menu_container{
  background:transparent !important;background-image:none !important;
  max-width:1250px;margin:0 auto !important;padding:0 20px 0 70px !important;
  display:flex !important;align-items:center !important;gap:12px !important;
  min-height:var(--px-nav-h);position:relative;
  flex-direction:row !important;flex-wrap:nowrap !important;justify-content:flex-start !important;
}
.menu_container::before{display:none !important}

/* nav containers (legacy uses #nav, css mostly targets #nav_en — cover both) */
#nav,#nav_en{
  float:none !important;position:static !important;z-index:200;
  margin:0 !important;display:flex !important;align-items:center !important;
  font-family:"Inter","Open Sans",Arial,sans-serif !important;
}
#nav ul#main-menu,#nav_en ul#main-menu{
  display:flex !important;align-items:stretch !important;gap:2px !important;
  margin:0 !important;padding:0 !important;list-style:none !important;
}
#nav ul#main-menu > li,#nav_en ul#main-menu > li{
  position:relative !important;display:flex !important;align-items:stretch !important;
  float:none !important;margin:0 !important;padding:0 !important;
  border-bottom:none !important;background:transparent !important;
}
/* top-level links */
#nav ul#main-menu > li > a,#nav_en ul#main-menu > li > a{
  display:inline-flex !important;align-items:center !important;gap:7px !important;
  height:var(--px-nav-h);padding:0 15px !important;line-height:1 !important;
  font-size:12px !important;font-weight:700 !important;letter-spacing:.05em !important;
  text-transform:uppercase !important;color:var(--px-ink) !important;
  text-decoration:none !important;position:relative;white-space:nowrap;
  transition:color .18s var(--px-ease);
}
#nav ul#main-menu > li > a > span,#nav_en ul#main-menu > li > a > span{color:inherit !important}
/* animated underline */
#nav ul#main-menu > li > a::after,#nav_en ul#main-menu > li > a::after{
  content:"" !important;position:absolute !important;left:12px !important;right:12px !important;
  bottom:10px !important;height:2.5px !important;border-radius:99px !important;
  background:linear-gradient(90deg,var(--px-primary),var(--px-primary-2)) !important;
  transform:scaleX(0) !important;transform-origin:left !important;
  transition:transform .25s var(--px-ease) !important;top:auto !important;width:auto !important;z-index:1 !important;
}
#nav ul#main-menu > li:hover > a::after,
#nav ul#main-menu > li.active > a::after,
#nav_en ul#main-menu > li:hover > a::after{
  transform:scaleX(1) !important;height:2.5px !important;
}
#nav ul#main-menu > li:hover > a,#nav_en ul#main-menu > li:hover > a{color:var(--px-primary) !important}
/* soft hover pill behind link */
#nav ul#main-menu > li:hover,#nav_en ul#main-menu > li:hover{/*! background:rgba(14,165,233,.08) !important; */border-radius:10px}
/* caret for parents */
#nav ul#main-menu > li.has-child > a,#nav_en ul#main-menu > li.has-child > a{padding-right:24px !important}
#nav ul#main-menu > li.has-child > a::before,#nav_en ul#main-menu > li.has-child > a::before{
  content:"\f107" !important;font-family:FontAwesome !important;position:absolute !important;
  right:9px !important;top:50% !important;transform:translateY(-50%) !important;
  font-size:12px !important;color:var(--px-primary-2) !important;transition:transform .25s var(--px-ease) !important;
}
#nav ul#main-menu > li.has-child:hover > a::before,#nav_en ul#main-menu > li.has-child:hover > a::before{transform:translateY(-50%) rotate(180deg) !important}

/* dropdowns — premium cards */
#nav ul li > ul,#nav_en ul li > ul{
  position:absolute !important;top:calc(100% + 10px) !important;left:0 !important;
  min-width:250px !important;width:max-content !important;max-width:320px !important;
  background:var(--px-card) !important;border:1px solid var(--px-border) !important;
  border-radius:14px !important;padding:8px !important;margin:0 !important;
  box-shadow:var(--px-shadow-md) !important;
  opacity:0 !important;visibility:hidden !important;transform:translateY(8px) scale(.98) !important;
  transition:opacity .22s var(--px-ease),transform .22s var(--px-ease),visibility .22s !important;
  z-index:300;list-style:none !important;
}
#nav ul li:hover > ul,#nav_en ul li:hover > ul{
  opacity:1 !important;visibility:visible !important;transform:none !important;top:calc(100% + 6px) !important;
}
#nav ul li ul > li,#nav_en ul li ul > li{
  position:relative !important;padding:0 !important;margin:0 !important;
  background:transparent !important;border:none !important;border-radius:9px !important;
}
#nav ul li ul > li > a,#nav_en ul li ul > li > a{
  display:flex !important;align-items:center !important;gap:8px !important;
  padding:10px 12px !important;margin:1px 0 !important;border-radius:9px !important;
  font-size:13px !important;font-weight:600 !important;color:var(--px-ink) !important;
  text-transform:none !important;letter-spacing:0 !important;white-space:normal !important;
  line-height:1.45 !important;transition:all .16s var(--px-ease) !important;
}
#nav ul li ul > li > a:hover,#nav_en ul li ul > li > a:hover{
  background:linear-gradient(90deg,rgba(11,108,180,.1),rgba(14,165,233,.1)) !important;
  color:var(--px-primary) !important;padding-left:16px !important;
}
#nav ul li ul > li::before,#nav_en ul li ul > li::before{display:none !important}
#nav ul li ul li > ul,#nav_en ul li ul li > ul{left:calc(100% + 8px) !important;top:-4px !important;margin-left:0 !important}
/* home icon */
.nav-home-icon{
  position:static !important;float:none !important;display:inline-flex !important;
  width:40px !important;height:40px !important;align-items:center !important;justify-content:center !important;
  border-radius:12px !important;background:linear-gradient(135deg,var(--px-primary),var(--px-primary-2)) !important;
  color:#fff !important;font-size:16px !important;line-height:1 !important;margin-right:6px !important;
  box-shadow:var(--px-shadow-sm);transition:all .2s var(--px-ease);
}
.nav-home-icon i{color:#fff !important}
.nav-home-icon:hover{transform:translateY(-1px);box-shadow:var(--px-shadow-md);background:linear-gradient(135deg,var(--px-primary-dark),var(--px-primary)) !important}

/* "Browse Papers" as premium CTA */
#nav ul#main-menu > li.px-papers-cta > a,#nav_en ul#main-menu > li.px-papers-cta > a{
  background:linear-gradient(135deg,var(--px-primary),var(--px-primary-2)) !important;
  color:#fff !important;border-radius:999px !important;height:38px !important;align-self:center !important;
  padding:0 18px !important;font-size:12.5px !important;/*! box-shadow:0 6px 16px -6px rgba(14,165,233,.6); */
}
#nav ul#main-menu > li.px-papers-cta > a::after,#nav_en ul#main-menu > li.px-papers-cta > a::after{display:none !important}
#nav ul#main-menu > li.px-papers-cta:hover,#nav_en ul#main-menu > li.px-papers-cta:hover{background:transparent !important}
#nav ul#main-menu > li.px-papers-cta > a:hover,#nav_en ul#main-menu > li.px-papers-cta > a:hover{color:#fff !important;filter:brightness(1.06);transform:translateY(-1px)}

/* Login / Register — premium buttons */
.menu_container .btn-reg-signin,.col.btn-reg-signin{
  position:static !important;margin-left:auto !important;display:flex !important;
  align-items:center !important;gap:8px !important;flex-shrink:0;
}
.btn.btn-login,.btn.btn-reg{
  border-radius:999px !important;font-size:13px !important;font-weight:700 !important;
  padding:9px 18px !important;margin:0 !important;line-height:1.2 !important;
  display:inline-flex !important;align-items:center !important;gap:7px !important;
  border:1px solid transparent !important;transition:all .2s var(--px-ease) !important;
  text-decoration:none !important;white-space:nowrap;
}
.btn.btn-login{background:#fff !important;color:var(--px-primary) !important;border-color:var(--px-border) !important;box-shadow:var(--px-shadow-sm)}
.btn.btn-login:hover{border-color:var(--px-primary-2) !important;box-shadow:var(--px-shadow-md);transform:translateY(-1px)}
.btn.btn-reg{background:linear-gradient(135deg,var(--px-primary) 0%,var(--px-primary-2) 100%) !important;color:#fff !important;/*! box-shadow:0 8px 18px -8px rgba(11,108,180,.7) */}
.btn.btn-reg:hover{filter:brightness(1.07);transform:translateY(-1px);box-shadow:var(--px-shadow-lg)}
body.dark-theme .btn.btn-login{background:#242c38 !important;color:#e8eef5 !important;border-color:#344052 !important}

/* --------------------------------------------------------------------------
   4) DARK-MODE SWITCH — professional toggle (overrides emoji version)
   -------------------------------------------------------------------------- */
.px-theme-wrap{display:inline-flex !important;align-items:center !important;gap:8px !important;flex-shrink:0}
.px-theme-label{font-size:11px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--px-muted)}
input#darkmode-toggle{position:absolute !important;width:1px !important;height:1px !important;opacity:0 !important;pointer-events:none}
label.darkmodelabel{
  width:66px !important;height:34px !important;border-radius:999px !important;
  background:linear-gradient(180deg,#eef4fa,#dbe7f3) !important;
  border:1px solid #c9d9e8 !important;position:relative !important;display:inline-block !important;
  cursor:pointer;transition:all .3s var(--px-ease) !important;
  box-shadow:inset 0 2px 6px rgba(11,108,180,.15),var(--px-shadow-sm) !important;
  overflow:hidden;
}
label.darkmodelabel:hover{border-color:var(--px-primary-2) !important;box-shadow:inset 0 2px 6px rgba(11,108,180,.2),0 0 0 4px rgba(14,165,233,.12)}
label.darkmodelabel::before{
  content:"";position:absolute;inset:0;border-radius:inherit;
  background:linear-gradient(90deg,rgba(14,165,233,.14),rgba(245,158,11,.14));
  opacity:0;transition:opacity .3s;
}
label.darkmodelabel::after{
  content:"" !important;width:26px !important;height:26px !important;
  position:absolute !important;top:3px !important;left:4px !important;
  border-radius:50% !important;background:#fff url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23f59e0b' stroke-width='2' stroke-linecap='round'%3E%3Ccircle cx='12' cy='12' r='4' fill='%23f59e0b' stroke='none'/%3E%3Cpath d='M12 2v2M12 20v2M4.9 4.9l1.4 1.4M17.7 17.7l1.4 1.4M2 12h2M20 12h2M4.9 19.1l1.4-1.4M17.7 6.3l1.4-1.4'/%3E%3C/svg%3E") center/16px no-repeat !important;
  box-shadow:0 2px 8px rgba(0,0,0,.25) !important;border:1px solid rgba(255,255,255,.7) !important;
  display:block !important;transition:left .32s var(--px-ease),transform .32s var(--px-ease),background .3s !important;
  font-size:0 !important;line-height:1 !important;
}
input#darkmode-toggle:checked + label.darkmodelabel{
  background:linear-gradient(180deg,#1c2940,#0f172a) !important;border-color:#334155 !important;
  box-shadow:inset 0 2px 8px rgba(0,0,0,.5),0 0 0 4px rgba(14,165,233,.1) !important;
}
input#darkmode-toggle:checked + label.darkmodelabel::before{opacity:1}
input#darkmode-toggle:checked + label.darkmodelabel::after{
  content:"" !important;left:calc(100% - 30px) !important;transform:none !important;
  background:#0f172a url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='%23fde68a'%3E%3Cpath d='M21 12.8A9 9 0 1 1 11.2 3 7 7 0 0 0 21 12.8z'/%3E%3C/svg%3E") center/15px no-repeat !important;
  border-color:#475569 !important;
}
label.darkmodelabel:active::after{width:30px !important}
input#darkmode-toggle:focus-visible + label.darkmodelabel{outline:2px solid var(--px-primary-2);outline-offset:3px}
/* kill legacy absolute positioning of the toggle wrapper */
.menu_container > div[style*="absolute"]{position:static !important;transform:none !important;z-index:auto !important}

/* --------------------------------------------------------------------------
   5) PAPERS TABS — premium segmented control
   -------------------------------------------------------------------------- */
/* Flat professional tab headings: plain bar with a solid indicator —
   no gradients, no shadows, no pills. */
.tab-wrapper{
  background:transparent !important;border:none !important;border-radius:0 !important;
  padding:0 !important;box-shadow:none !important;margin-bottom:16px;
  position:sticky;top:calc(var(--px-nav-h) + 8px);z-index:5;
  border-bottom:2px solid var(--px-border) !important;
}
ul.tabs{
  display:flex !important;gap:2px !important;margin:0 !important;padding:0 !important;list-style:none !important;
  overflow-x:auto;scrollbar-width:thin;
}
li.tab-link{
  flex:0 0 auto;display:inline-flex !important;align-items:center !important;justify-content:center !important;gap:8px !important;
  padding:12px 20px !important;border:none !important;border-bottom:2px solid transparent !important;border-radius:0 !important;
  margin-bottom:-2px !important;cursor:pointer;white-space:nowrap;background:transparent !important;
  font-size:12.5px !important;font-weight:700 !important;letter-spacing:.08em !important;text-transform:uppercase !important;
  color:var(--px-muted) !important;transition:color .18s,border-color .18s,background .18s;position:relative;user-select:none;
}
li.tab-link i{font-size:13px;color:inherit;opacity:.75}
li.tab-link:hover{color:var(--px-primary) !important;background:rgba(14,165,233,.06) !important}
li.tab-link.active{
  color:var(--px-primary) !important;background:transparent !important;
  border-bottom-color:var(--px-primary) !important;box-shadow:none !important;
}
li.tab-link.active::after{display:none !important}
body.dark-theme .tab-wrapper{border-bottom-color:#2c3442 !important}
body.dark-theme li.tab-link.active{background:transparent !important;color:#7dd3fc !important;border-bottom-color:#7dd3fc !important}
.content-wrapper{
  background:var(--px-card);border:1px solid var(--px-border) !important;border-radius:var(--px-radius);
  padding:22px !important;box-shadow:var(--px-shadow-sm);
}
/* NOTE: plain display toggle on purpose — bootstrap.css ships an
   opacity:0 + fill-forwards fade on this same selector that can leave
   panes stuck invisible. No opacity, no animation = robust. */
.tab-content{display:none !important;opacity:1 !important;transform:none !important;animation:none !important}
.tab-content.active{display:block !important;opacity:1 !important;transform:none !important;animation:none !important}

/* --------------------------------------------------------------------------
   6) PAPER CARDS (homepage .paper_container + papers.php .paper-card)
   -------------------------------------------------------------------------- */
.paper_container,.paper-card{
  background:var(--px-card) !important;border:1px solid var(--px-border) !important;
  border-radius:16px !important;padding:20px 22px !important;margin-bottom:18px !important;
  box-shadow:var(--px-shadow-sm) !important;position:relative;overflow:hidden;
  transition:transform .25s var(--px-ease),box-shadow .25s var(--px-ease),border-color .25s !important;
}
.paper_container::before,.paper-card::before{
  content:"";position:absolute;left:0;top:0;bottom:0;width:4px;
  background:linear-gradient(180deg,var(--px-primary),var(--px-primary-2));
  opacity:0;transition:opacity .25s;
}
.paper_container:hover,.paper-card:hover{transform:translateY(-3px);box-shadow:var(--px-shadow-md) !important;border-color:#bae6fd !important}
body.dark-theme .paper_container:hover,body.dark-theme .paper-card:hover{border-color:#33506b !important}
.paper_container:hover::before,.paper-card:hover::before{opacity:1}
/* off-white meta bar (jcsis.org concept) with colorized icons */
.articledatetimeinfo{
  float:none !important;width:auto !important;
  background:#f8fafc !important;border:1px solid var(--px-border-soft) !important;border-radius:10px !important;
  padding:8px 12px !important;margin-bottom:12px !important;
  display:flex !important;flex-wrap:wrap !important;align-items:center !important;gap:4px 14px !important;
}
body.dark-theme .articledatetimeinfo{background:#20262f !important;border-color:#2c3442 !important}
.articledatetimeinfo span{
  display:inline-flex !important;align-items:center !important;gap:6px !important;
  font-size:12px !important;font-weight:600 !important;color:var(--px-muted) !important;
  background:transparent !important;border:none !important;
  padding:2px 0 !important;margin:0 !important;
}
.articledatetimeinfo span i{margin:0 !important;font-size:13px !important}
/* colorized icons — same palette as jcsis.org */
.articledatetimeinfo .fa-calendar{color:#009fff !important}
.articledatetimeinfo .fa-book{color:#9f3571 !important}
.articledatetimeinfo .fa-bookmark{color:#ffb300 !important}
.paper-meta-item{
  display:inline-flex !important;align-items:center !important;gap:6px !important;
  font-size:12px !important;font-weight:600 !important;color:var(--px-muted) !important;
  background:var(--px-bg);border:1px solid var(--px-border-soft);
  padding:5px 10px;border-radius:999px;margin:0 6px 6px 0 !important;
}
.paper-meta-item i{color:var(--px-primary-2) !important;margin:0 !important}
h3.px-paper-title,.paper-title{font-size:18px !important;line-height:1.45 !important;font-weight:800 !important;margin:2px 0 8px !important;letter-spacing:-.01em}
h3.px-paper-title a,.paper-title a{color:var(--px-ink) !important;text-decoration:none !important;transition:color .18s}
h3.px-paper-title a:hover,.paper-title a:hover{color:var(--px-primary) !important}
.paper_abstract,.paper-abstract{font-size:14px !important;line-height:1.7 !important;color:var(--px-muted) !important;margin:8px 0 12px !important}
hr.stats,.paper-separator{border:none !important;border-top:1px solid var(--px-border-soft) !important;margin:14px 0 !important;background:none !important;height:auto !important}
.paper_stats{display:flex;gap:14px;align-items:center}
.stats_span{font-size:12.5px;font-weight:600;color:var(--px-muted);display:inline-flex;align-items:center;gap:6px}
.stats_span i{color:var(--px-primary-2)}
.stats_num{background:var(--px-bg);border:1px solid var(--px-border);border-radius:999px;padding:1px 9px;font-weight:800;color:var(--px-ink)}
.paper-actions{display:flex;gap:10px;flex-wrap:wrap}
.paper-btn,.btn-paper{
  display:inline-flex !important;align-items:center !important;gap:8px !important;
  font-size:13px !important;font-weight:700 !important;padding:9px 18px !important;
  border-radius:999px !important;border:1px solid var(--px-border) !important;
  background:#fff !important;color:var(--px-primary) !important;
  transition:all .2s var(--px-ease) !important;text-decoration:none !important;cursor:pointer;
}
.paper-btn:hover,.btn-paper:hover{background:rgba(14,165,233,.08) !important;border-color:var(--px-primary-2) !important;color:var(--px-primary-dark) !important}
/* legacy style_en.css lifts .btn-sm buttons -5px on hover — neutralize for a calm, clean feel */
.paper-btn.btn-sm:hover,.btn-paper.btn-sm:hover,.paper-btn:hover,.btn-paper:hover{transform:none !important;box-shadow:none !important}
.download-btn,.btn-download{
  background:linear-gradient(135deg,var(--px-primary),var(--px-primary-2)) !important;
  color:#fff !important;border-color:transparent !important;
  box-shadow:0 8px 18px -8px rgba(11,108,180,.7);
}
.download-btn i,.btn-download i{color:#fff !important}
.download-btn:hover,.btn-download:hover{filter:brightness(1.07);color:#fff !important}
.keyword-tag{
  background:rgba(14,165,233,.1) !important;color:var(--px-primary) !important;
  border:1px solid rgba(14,165,233,.22);font-weight:700 !important;border-radius:999px !important;
  padding:4px 11px !important;font-size:11.5px !important;
}
body.dark-theme .keyword-tag{background:rgba(14,165,233,.16) !important;color:#7dd3fc !important}

/* --------------------------------------------------------------------------
   7) SIDEMENU — premium sidebar card
   -------------------------------------------------------------------------- */
.hpanel.sidemenu,.side-nav{
  background:var(--px-card) !important;border:1px solid var(--px-border) !important;
  border-radius:var(--px-radius) !important;box-shadow:var(--px-shadow-sm) !important;
  padding:0 !important;overflow:hidden;margin-top:0 !important;
}
.hpanel.sidemenu .panel-heading,.side-nav .panel-heading{
  font-size:13px !important;font-weight:800 !important;letter-spacing:.12em;text-transform:uppercase;
  color:var(--px-ink) !important;padding:16px 20px 12px !important;margin:0 !important;
  display:flex;align-items:center;gap:8px;
}
.hpanel.sidemenu .panel-heading::before,.side-nav .panel-heading::before{
  content:"";width:22px;height:4px;border-radius:99px;
  background:linear-gradient(90deg,var(--px-primary),var(--px-primary-2));display:inline-block;
}
.sidemenu_sep{border:none !important;border-top:1px solid var(--px-border-soft) !important;margin:0 0 6px !important;background:none !important}
.hpanel.sidemenu .panel-body,.hpanel.sidemenu .panel-bodyx,.side-nav .panel-body{padding:8px 10px 14px !important}
.hpanel.sidemenu ul,.side-nav ul{margin:0 !important;padding:0 !important;list-style:none !important}
.hpanel.sidemenu ul li a,.side-nav ul li a{
  display:flex !important;align-items:center !important;gap:9px !important;
  padding:10px 12px !important;border-radius:10px !important;
  font-size:13.5px !important;font-weight:600 !important;color:var(--px-ink) !important;
  text-decoration:none !important;transition:all .18s var(--px-ease);
}
.hpanel.sidemenu ul li a i,.side-nav ul li a i{color:var(--px-primary-2) !important;font-size:11px;transition:transform .18s var(--px-ease)}
.hpanel.sidemenu ul li a:hover,.side-nav ul li a:hover{background:rgba(14,165,233,.09);color:var(--px-primary) !important;padding-left:16px !important}
.hpanel.sidemenu ul li a:hover i,.side-nav ul li a:hover i{transform:translateX(2px)}
/* filter form inside sidemenu */
.sidemenu .form-group{margin-bottom:12px !important}
.sidemenu select.form-control,.sidemenu .form-select2,.side-nav select{
  border-radius:10px !important;border:1px solid var(--px-border) !important;
  padding:10px 12px !important;font-size:13px !important;background:var(--px-bg);color:var(--px-ink);
  transition:border-color .18s,box-shadow .18s;
}
.sidemenu select:focus{border-color:var(--px-primary-2) !important;box-shadow:0 0 0 3px rgba(14,165,233,.15) !important;outline:none}
.sidemenu input[type="submit"],.sidemenu .btn-primary{
  width:100%;border:none;border-radius:10px !important;padding:11px !important;font-weight:800 !important;
  background:linear-gradient(135deg,var(--px-primary),var(--px-primary-2)) !important;color:#fff !important;
  box-shadow:0 8px 18px -8px rgba(11,108,180,.7);transition:all .2s var(--px-ease);cursor:pointer;
}
.sidemenu input[type="submit"]:hover{filter:brightness(1.07);transform:translateY(-1px)}

/* --------------------------------------------------------------------------
   8) Papers.php filter bar + grid polish (uses same tokens)
   -------------------------------------------------------------------------- */
.papers-filters{
  background:var(--px-card) !important;border:1px solid var(--px-border) !important;
  border-radius:var(--px-radius) !important;box-shadow:var(--px-shadow-sm) !important;
}
.papers-header h1{letter-spacing:-.02em}
.btn-filter{border-radius:999px !important;font-weight:700 !important;padding:10px 20px !important}
.pagination a,.pagination span{border-radius:10px !important}
.pagination .active{background:linear-gradient(135deg,var(--px-primary),var(--px-primary-2)) !important;border-color:transparent !important}

/* --------------------------------------------------------------------------
   9) RESPONSIVE
   -------------------------------------------------------------------------- */
.resp-navigator{
  display:none !important;width:44px;height:44px;border-radius:12px !important;
  background:var(--px-card);border:1px solid var(--px-border) !important;
  align-items:center;justify-content:center;color:var(--px-primary) !important;
  box-shadow:var(--px-shadow-sm);cursor:pointer;
}
@media (max-width:1200px){
  .menu_container{padding:0 14px !important}
  #nav ul#main-menu > li > a,#nav_en ul#main-menu > li > a{padding:0 10px !important;font-size:12px !important}
  .subheader_wrapper .left-header a span{display:none}
}
@media (max-width:992px){
  #nav,#nav_en{display:none !important}
  .resp-navigator{display:inline-flex !important}
  .menu_container{justify-content:flex-start;gap:10px}
  .menu_container .btn-reg-signin{margin-left:auto !important}
  .btn.btn-login,.btn.btn-reg{padding:8px 13px !important;font-size:12px !important}
  .tab-wrapper{position:static}
  li.tab-link{flex:1 0 auto}
  .subheader_wrapper .left-header{display:none !important}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{transition:none !important;animation:none !important}
}

/* ---- premium article preview header (?act=preview) ---- */
.paper_section.px-preview{padding:6px 6px 0}
.px-back{
  display:inline-flex;align-items:center;gap:8px;margin-bottom:14px;
  font-size:13px;font-weight:700;color:var(--px-muted);text-decoration:none !important;
}
.px-back i{font-size:12px}
.px-back:hover{color:var(--px-primary)}
.px-preview .papertitle{margin:4px 0 12px !important;padding:0 !important}
.papertitle h1{
  font-size:26px !important;line-height:1.35 !important;font-weight:800 !important;
  letter-spacing:-.02em !important;color:var(--px-ink) !important;margin:0 !important;
}
.px-preview .authors{display:flex !important;flex-wrap:wrap !important;gap:8px !important;margin:0 0 12px !important}
.px-preview .author{
  display:inline-flex !important;align-items:center !important;gap:7px !important;
  font-size:13px !important;font-weight:600 !important;color:var(--px-ink) !important;
  background:var(--px-bg) !important;border:1px solid var(--px-border) !important;
  border-radius:999px !important;padding:6px 13px !important;margin:0 !important;
}
.px-preview .author i{color:var(--px-primary-2) !important;font-size:12px !important}
body.dark-theme .px-preview .author{background:#242c38 !important;border-color:#344052 !important}
.px-preview .paper-keywords{margin-bottom:14px}

/* paper card micro-typography (no inline styles) */
.abstract-label{font-weight:800;font-size:12px;letter-spacing:.08em;text-transform:uppercase;color:var(--px-primary);margin-right:6px}
.paper-journal{display:block;font-size:12.5px;font-style:italic;color:var(--px-muted);margin:2px 0 4px}
.paper-id{white-space:nowrap}
.px-nav-holder{display:flex !important;align-items:center !important;gap:10px !important}
#nav .toplevel,#nav_en .toplevel{display:inline-flex;align-items:center;gap:7px}

/* ---- papers tabs: meta row, filter note, empty states, rank badges ---- */
.px-tab-meta{
  display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;
  font-size:13px;color:var(--px-muted);margin-bottom:16px;
  padding:10px 14px;background:var(--px-bg);border:1px solid var(--px-border-soft);border-radius:12px;
}
.px-tab-meta strong{color:var(--px-ink)}
.px-viewall{
  display:inline-flex;align-items:center;gap:7px;font-size:13px;font-weight:800;color:var(--px-primary);
  text-decoration:none !important;white-space:nowrap;
}
.px-viewall i{font-size:12px;transition:transform .2s var(--px-ease)}
.px-viewall:hover i{transform:translateX(3px)}
.px-filter-note{
  display:flex;align-items:center;gap:8px;flex-wrap:wrap;
  font-size:13px;color:var(--px-muted);margin-bottom:16px;
  padding:10px 14px;background:rgba(14,165,233,.08);border:1px solid rgba(14,165,233,.25);border-radius:12px;
}
.px-filter-note strong{color:var(--px-primary)}
.px-filter-note a{font-weight:800;color:var(--px-primary)}
.px-empty{
  text-align:center;padding:44px 20px;border:1.5px dashed var(--px-border);border-radius:var(--px-radius);
  color:var(--px-muted);background:var(--px-bg);
}
.px-empty i{font-size:34px;color:var(--px-primary-2);opacity:.7;margin-bottom:10px}
.px-empty h4{font-size:17px;font-weight:800;color:var(--px-ink);margin:6px 0}
.px-empty p{font-size:13.5px;margin:0 0 16px}
.px-empty .paper-btn{margin:2px 4px}
.px-rank{
  font-weight:800 !important;font-size:12px !important;color:#fff !important;
  background:linear-gradient(135deg,#94a3b8,#64748b) !important;border:none !important;
  min-width:38px;justify-content:center;padding:3px 10px !important;border-radius:999px !important;
}
.px-rank-top{background:linear-gradient(135deg,#f59e0b,#f97316) !important;box-shadow:0 4px 10px -3px rgba(245,158,11,.6)}
.paper-authors{font-size:13px;font-weight:600;color:var(--px-ink);margin:2px 0 6px;display:flex;align-items:center;gap:7px}
.paper-authors i{color:var(--px-primary-2)}
.paper-keywords{display:flex;flex-wrap:wrap;gap:6px;margin:4px 0 10px}
.paper_abstract{display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.px-clear-filter{margin-left:8px;text-decoration:none !important}