/* IJDTDE — Journal Website Styles (ScienceDirect-like structure, original design) */

:root{
  --bg:#f6f7fb;
  --bg2:#ffffff;
  --text:#0f172a;
  --muted:#475569;
  --muted2:#64748b;
  --line:rgba(15,23,42,.14);
  --card:rgba(15,23,42,.04);
  --card2:rgba(15,23,42,.06);
  --primary:#2563eb;
  --primary2:#1d4ed8;
  --accent:#06b6d4;
  --shadow:0 16px 40px rgba(2,6,23,.08);
  --radius:16px;
  --radius2:22px;
  --max:1180px;
  --pad:22px;
  --font: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji","Segoe UI Emoji";
}

[data-theme="dark"]{
  --bg:#0b1020;
  --bg2:#0f1730;
  --text:rgba(255,255,255,.92);
  --muted:rgba(255,255,255,.72);
  --muted2:rgba(255,255,255,.58);
  --line:rgba(255,255,255,.12);
  --card:rgba(255,255,255,.06);
  --card2:rgba(255,255,255,.08);
  --shadow:0 16px 40px rgba(0,0,0,.35);
}

*{ box-sizing:border-box; }
html,body{ height:100%; }
body{
  margin:0;
  font-family:var(--font);
  background:
    radial-gradient(1100px 700px at 15% 0%, rgba(37,99,235,.10), transparent 60%),
    radial-gradient(900px 650px at 85% 10%, rgba(6,182,212,.10), transparent 55%),
    linear-gradient(180deg, var(--bg), var(--bg2));
  color:var(--text);
  line-height:1.55;
}

a{ color:inherit; text-decoration:none; }
a:hover{ text-decoration:underline; }

img{ max-width:100%; display:block; }

.container{
  width:min(var(--max), calc(100% - 2*var(--pad)));
  margin-inline:auto;
}

.skip-link{
  position:absolute; left:-999px; top:10px;
  padding:10px 14px; border-radius:12px;
  background:var(--primary); color:#fff;
}
.skip-link:focus{ left:10px; z-index:999; }

.sr-only{
  position:absolute; width:1px; height:1px; padding:0; margin:-1px; overflow:hidden;
  clip:rect(0,0,0,0); white-space:nowrap; border:0;
}

.topbar{
  border-bottom:1px solid var(--line);
  background:rgba(255,255,255,.55);
  backdrop-filter: blur(10px);
}
[data-theme="dark"] .topbar{ background: rgba(0,0,0,.18); }

.topbar__inner{
  display:flex; align-items:center; justify-content:space-between;
  gap:12px; padding:10px 0;
}

.pill{
  display:inline-flex; align-items:center; gap:8px;
  padding:6px 10px; border-radius:999px;
  border:1px solid var(--line);
  background:rgba(255,255,255,.6);
  color:var(--muted);
  font-size:13px;
}
[data-theme="dark"] .pill{ background: rgba(255,255,255,.04); }

.header{
  position:sticky; top:0; z-index:60;
  border-bottom:1px solid var(--line);
  background:rgba(255,255,255,.72);
  backdrop-filter: blur(12px);
}
[data-theme="dark"] .header{ background: rgba(0,0,0,.22); }

.header__inner{
  display:flex; align-items:center; justify-content:space-between;
  gap:14px; padding:12px 0;
}

.brand{ display:flex; align-items:center; gap:12px; min-width:240px; }
.brand__logo{ width:44px; height:44px; }
.brand__name{ font-weight:900; letter-spacing:.3px; }
.brand__tag{ font-size:12.5px; color:var(--muted2); margin-top:1px; }

.nav{ display:flex; align-items:center; }
.nav__toggle{
  display:none;
  border:1px solid var(--line);
  background:rgba(255,255,255,.55);
  border-radius:12px;
  padding:10px 12px;
}
[data-theme="dark"] .nav__toggle{ background: rgba(255,255,255,.04); }

.nav__toggleBars{
  display:block; width:20px; height:12px;
  background:
    linear-gradient(var(--text), var(--text)) 0 0 / 100% 2px no-repeat,
    linear-gradient(var(--text), var(--text)) 0 50% / 100% 2px no-repeat,
    linear-gradient(var(--text), var(--text)) 0 100% / 100% 2px no-repeat;
  opacity:.9;
}

.nav__menu{
  display:flex; align-items:center; gap:10px; flex-wrap:wrap;
}
.nav__menu a{
  padding:9px 10px;
  border-radius:12px;
  color:var(--muted);
  font-weight:700;
  font-size:14px;
  text-decoration:none;
}
.nav__menu a:hover{
  background:rgba(15,23,42,.06);
  color:var(--text);
  text-decoration:none;
}
[data-theme="dark"] .nav__menu a:hover{ background: rgba(255,255,255,.05); }

.nav__cta{
  border:1px solid var(--line);
  background:rgba(255,255,255,.55);
}
[data-theme="dark"] .nav__cta{ background: rgba(255,255,255,.04); }

@media (max-width: 980px){
  .nav__toggle{ display:inline-flex; }
  .nav__menu{
    position:absolute;
    right: var(--pad);
    top: 68px;
    width:min(420px, calc(100% - 2*var(--pad)));
    display:none;
    flex-direction:column;
    align-items:stretch;
    gap:6px;
    padding:10px;
    border-radius: var(--radius2);
    border:1px solid var(--line);
    background: rgba(255,255,255,.92);
    box-shadow: var(--shadow);
  }
  [data-theme="dark"] .nav__menu{ background: rgba(10,16,32,.92); }
  .nav__menu.is-open{ display:flex; }
}

.btn{
  display:inline-flex; align-items:center; justify-content:center; gap:8px;
  padding:11px 14px;
  border-radius:14px;
  border:1px solid transparent;
  font-weight:900;
  cursor:pointer;
  transition: transform .06s ease, background .2s ease, border-color .2s ease;
  text-decoration:none !important;
}
.btn:active{ transform: translateY(1px); }
.btn--sm{ padding:8px 10px; border-radius:12px; font-size:13px; }
.btn--primary{ background: linear-gradient(180deg, var(--primary), var(--primary2)); color:#fff; }
.btn--secondary{ background: rgba(15,23,42,.05); border-color: var(--line); color: var(--text); }
[data-theme="dark"] .btn--secondary{ background: rgba(255,255,255,.06); }
.btn--ghost{ background: transparent; border-color: var(--line); color: var(--muted); }

.hero{
  padding: 44px 0 18px;
}
.hero__inner{
  display:grid;
  grid-template-columns: 1.2fr .85fr;
  gap: 18px;
  align-items: start;
}
@media (max-width: 980px){ .hero__inner{ grid-template-columns: 1fr; } }

.hero h1{
  font-size: clamp(28px, 3vw, 42px);
  line-height: 1.12;
  margin: 8px 0 10px;
}
.lead{ color: var(--muted); font-size: 16.5px; max-width: 72ch; }

.card{
  border: 1px solid var(--line);
  border-radius: var(--radius2);
  background: var(--card);
  padding: 18px;
  box-shadow: var(--shadow);
}
.card--flat{ box-shadow:none; background: var(--card2); }
.divider{ height:1px; background: var(--line); margin: 12px 0; }

.grid{ display:grid; gap:14px; }
.grid--2{ grid-template-columns: repeat(2, 1fr); }
.grid--3{ grid-template-columns: repeat(3, 1fr); }
@media (max-width: 980px){
  .grid--2, .grid--3{ grid-template-columns: 1fr; }
}

.kpis{
  display:flex; gap:10px; flex-wrap:wrap;
  margin-top: 14px;
}
.kpi{
  min-width: 160px;
  padding: 12px 14px;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: rgba(255,255,255,.65);
}
[data-theme="dark"] .kpi{ background: rgba(255,255,255,.04); }
.kpi__k{ font-weight: 1000; font-size: 18px; }
.kpi__v{ color: var(--muted2); font-size: 13px; margin-top: 2px; }

.section{ padding: 22px 0; }
.section h2{ margin: 0 0 8px; font-size: 24px; }
.section p{ margin: 0 0 10px; }
.muted{ color: var(--muted); }
.small{ color: var(--muted2); font-size: 13px; }

.list{
  display:flex; flex-direction:column; gap: 10px;
  margin-top: 12px;
}
.item{
  padding: 14px;
  border-radius: 16px;
  border: 1px solid var(--line);
  background: rgba(255,255,255,.70);
}
[data-theme="dark"] .item{ background: rgba(255,255,255,.04); }
.item h3{ margin: 0 0 4px; font-size: 16px; }
.item p{ margin: 0; color: var(--muted); }

.badge{
  display:inline-flex; align-items:center; gap:8px;
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255,255,255,.65);
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
}
[data-theme="dark"] .badge{ background: rgba(255,255,255,.04); }

.footer{
  padding: 26px 0 16px;
  border-top: 1px solid var(--line);
  background: rgba(255,255,255,.6);
}
[data-theme="dark"] .footer{ background: rgba(0,0,0,.18); }

.footer__inner{
  display:flex; gap:22px; justify-content:space-between; align-items:flex-start;
  flex-wrap:wrap;
}
.footer__brand{ display:flex; align-items:center; gap:12px; min-width: 260px; }
.footer__logo{ width: 36px; height: 36px; }
.footer__name{ font-weight: 1000; }
.footer__muted{ color: var(--muted2); font-size: 13px; }

.footer__cols{
  display:grid;
  grid-template-columns: repeat(3, minmax(160px, 1fr));
  gap: 18px;
}
@media (max-width: 900px){ .footer__cols{ grid-template-columns: 1fr; width: 100%; } }
.footer__col{ display:flex; flex-direction:column; gap: 8px; }
.footer__title{ font-weight: 1000; margin-bottom: 2px; }
.footer__col a{ color: var(--muted); }
.footer__col a:hover{ color: var(--text); }

.footer__bottom{
  display:flex; justify-content:space-between; align-items:center;
  gap: 10px;
  margin-top: 18px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  color: var(--muted2);
  font-size: 13px;
  flex-wrap: wrap;
}