/* Excel VBA 365 shared theme */
:root{
  --bg:#07111f;
  --bg2:#0d1829;
  --panel:#10203a;
  --panel2:#152a48;
  --card:#112542;
  --border:#284468;
  --soft:#9db0c9;
  --text:#edf5ff;
  --primary:#38a3ff;
  --primary2:#75c4ff;
  --accent:#6ee7ff;
  --gold:#f6c453;
  --green:#5de2a8;
  --excel:#1d6f42;
  --excel2:#2ca35e;
  --shadow:0 16px 40px rgba(0,0,0,.34);
  --radius:18px;
  --max:1200px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:Inter,system-ui,sans-serif;
  background:
    radial-gradient(circle at top left, rgba(56,163,255,.12), transparent 32%),
    radial-gradient(circle at 78% 12%, rgba(110,231,255,.08), transparent 28%),
    linear-gradient(180deg, #08111f 0%, #0a1424 100%);
  color:var(--text);
  line-height:1.7;
}
a{text-decoration:none;color:inherit}
img{max-width:100%;display:block}
.container{width:min(var(--max), calc(100% - 32px)); margin:auto}

/* Header */
.site-header{
  position:sticky; top:0; z-index:1000;
  backdrop-filter:blur(14px);
  background:rgba(8,17,31,.84);
  border-bottom:1px solid rgba(255,255,255,.06);
}
.nav{
  min-height:72px;
  display:flex; align-items:center; justify-content:space-between; gap:20px;
}
.brand{
  display:flex; align-items:center; gap:12px; font-weight:800;
}
.brand-logo{
  width:40px; height:40px; border-radius:12px;
  display:grid; place-items:center;
  background:linear-gradient(135deg, var(--excel), var(--excel2));
  color:#fff; font-weight:800;
  box-shadow:0 10px 24px rgba(29,111,66,.35);
}
.brand-text{
  font-family:Rajdhani,sans-serif; font-size:1.35rem; letter-spacing:.02em;
}
.brand-text span{color:#86f0b7}
.nav-links{
  display:flex; align-items:center; gap:18px; flex-wrap:wrap;
}
.nav-links a{color:#d4e4fb; font-size:.95rem}
.nav-links a:hover{color:#fff}
.nav-cta{
  padding:11px 18px; border-radius:999px;
  background:linear-gradient(135deg, var(--primary), #3289ff);
  color:#fff; font-weight:700;
  box-shadow:0 12px 26px rgba(56,163,255,.24);
}

/* Layout */
.page-shell{
  width:min(var(--max), calc(100% - 32px));
  margin:34px auto 56px;
  display:grid;
  grid-template-columns:300px minmax(0, 1fr);
  gap:26px;
}
.sidebar{
  position:sticky; top:96px;
  align-self:start;
  max-height:calc(100vh - 120px);
  overflow:auto;
  background:linear-gradient(180deg, rgba(16,32,58,.94), rgba(12,24,42,.98));
  border:1px solid rgba(255,255,255,.07);
  border-radius:22px;
  box-shadow:var(--shadow);
  padding:22px 18px;
}
.sidebar::-webkit-scrollbar{width:10px}
.sidebar::-webkit-scrollbar-thumb{background:#27456c;border-radius:999px}
.sidebar-brand{
  padding-bottom:16px;
  border-bottom:1px solid rgba(255,255,255,.08);
  margin-bottom:16px;
}
.sidebar-brand img{
  width:100%;
  max-width:180px;
  margin:0 auto;
}
.sidebar-title{
  font-size:1.1rem;
  font-weight:800;
  margin:0 0 12px;
  color:#fff;
}
.side-links{
  display:grid;
  gap:6px;
}
.side-link{
  display:block;
  padding:10px 12px;
  border-radius:12px;
  color:#dceaff;
  font-size:.95rem;
  transition:.2s ease;
}
.side-link:hover,.side-link.active{
  background:rgba(255,255,255,.08);
  color:#fff;
  transform:translateX(2px);
}
.side-heading{
  margin:18px 0 10px;
  font-size:.78rem;
  text-transform:uppercase;
  letter-spacing:.08em;
  color:#96efbe;
  font-weight:800;
}
.sidebar-book{
  margin-top:16px;
  padding:14px;
  background:rgba(255,255,255,.04);
  border:1px solid rgba(255,255,255,.06);
  border-radius:16px;
}
.sidebar-book img{
  width:100%;
  max-width:160px;
  margin:0 auto 12px;
  border-radius:12px;
  box-shadow:0 10px 20px rgba(0,0,0,.25);
}
.sidebar-book h3{
  margin:0 0 8px;
  font-size:1rem;
}
.sidebar-book p{
  margin:0 0 12px;
  color:var(--soft);
  font-size:.9rem;
}
.sidebar-book a{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  padding:10px 14px;
  border-radius:12px;
  background:linear-gradient(135deg, var(--primary), #3289ff);
  color:#fff; font-weight:700; font-size:.9rem;
}

.content{
  min-width:0;
}
.hero{
  background:
    linear-gradient(135deg, rgba(56,163,255,.12), rgba(110,231,255,.08)),
    rgba(255,255,255,.03);
  border:1px solid rgba(110,231,255,.15);
  border-radius:26px;
  padding:34px;
  box-shadow:var(--shadow);
  margin-bottom:24px;
}
.eyebrow{
  display:inline-flex; align-items:center; gap:8px;
  padding:7px 12px;
  border:1px solid rgba(134,240,183,.22);
  background:rgba(134,240,183,.08);
  color:#9cf3c1;
  border-radius:999px;
  font-size:.78rem; font-weight:700; letter-spacing:.04em;
  text-transform:uppercase;
}
.hero h1{
  margin:16px 0 10px;
  font-size:clamp(2rem, 4vw, 3.7rem);
  line-height:1.05;
  letter-spacing:-.03em;
}
.hero h1 .highlight{color:#8dd7ff}
.hero p{
  color:var(--soft);
  margin:0;
  max-width:820px;
}
.hero-actions{
  display:flex; flex-wrap:wrap; gap:12px;
  margin-top:22px;
}
.btn{
  display:inline-flex; align-items:center; justify-content:center;
  padding:13px 20px;
  border-radius:14px;
  font-weight:700;
}
.btn-primary{
  background:linear-gradient(135deg, var(--primary), #3289ff);
  color:#fff;
}
.btn-secondary{
  border:1px solid var(--border);
  background:rgba(255,255,255,.03);
  color:#fff;
}
.hero-points{
  display:flex; flex-wrap:wrap; gap:10px;
  margin-top:18px;
}
.pill{
  padding:8px 12px;
  border-radius:999px;
  background:rgba(255,255,255,.04);
  border:1px solid rgba(255,255,255,.07);
  color:#d8e6fb;
  font-size:.87rem;
}

.card{
  background:linear-gradient(180deg, rgba(17,27,45,.9), rgba(12,20,34,.96));
  border:1px solid rgba(255,255,255,.07);
  border-radius:22px;
  padding:28px;
  box-shadow:var(--shadow);
  margin-bottom:22px;
}
.card h2{
  margin:0 0 12px;
  font-size:1.7rem;
  line-height:1.15;
}
.card h3{
  margin:24px 0 10px;
  font-size:1.22rem;
  color:#fff;
}
.card p, .card li{color:#dfeafd}
.card ul, .card ol{padding-left:22px}
.card strong{color:#fff}
.section-intro{
  font-size:1.05rem;
  color:var(--soft);
  margin-top:6px;
}
.code-block{
  background:#0c1626;
  color:#eaf3ff;
  border:1px solid rgba(255,255,255,.08);
  border-radius:16px;
  padding:18px;
  overflow:auto;
  margin:18px 0;
  font-family:"JetBrains Mono",monospace;
  font-size:.94rem;
  line-height:1.7;
}
.figure-box{
  margin:18px 0;
  background:rgba(255,255,255,.03);
  border:1px solid rgba(255,255,255,.06);
  border-radius:18px;
  padding:16px;
}
.figure-box img{
  border-radius:12px;
  width:auto;
  max-width:100%;
  margin:0 auto;
}
.figure-box figcaption{
  color:var(--soft);
  font-size:.92rem;
  margin-top:10px;
  text-align:center;
}
.highlight-box{
  background:linear-gradient(135deg, rgba(56,163,255,.12), rgba(110,231,255,.08));
  border:1px solid rgba(110,231,255,.14);
  border-radius:18px;
  padding:18px;
  margin:18px 0;
}
.check-grid{
  display:grid;
  grid-template-columns:repeat(2, minmax(0,1fr));
  gap:10px 18px;
  margin-top:14px;
}
.check-grid div{color:#dff0ff}
.split-grid{
  display:grid;
  grid-template-columns:repeat(2, minmax(0,1fr));
  gap:20px;
}
.book-grid{
  display:grid;
  grid-template-columns:repeat(2, minmax(0,1fr));
  gap:20px;
}
.book-card{
  background:rgba(255,255,255,.03);
  border:1px solid rgba(255,255,255,.06);
  border-radius:20px;
  padding:20px;
}
.book-card img{
  max-width:220px;
  width:100%;
  margin:0 auto 16px;
  border-radius:14px;
  box-shadow:0 10px 24px rgba(0,0,0,.3);
}
.book-card h3{margin:0 0 10px}
.book-card p{margin:0 0 14px; color:var(--soft)}
.resource-list{
  display:grid;
  gap:12px;
}
.resource-item{
  padding:14px 16px;
  border-radius:16px;
  background:rgba(255,255,255,.03);
  border:1px solid rgba(255,255,255,.06);
}
.nav-prevnext{
  display:flex;
  justify-content:space-between;
  gap:12px;
  flex-wrap:wrap;
  margin:18px 0 0;
}
.footer{
  margin-top:28px;
  padding:24px 0 10px;
  color:var(--soft);
  text-align:center;
  border-top:1px solid rgba(255,255,255,.08);
}
.footer a{color:#cfe8ff}
.mobile-toggle{
  display:none;
  width:100%;
  margin-bottom:14px;
}
.mobile-sidebar{
  display:none;
}

@media (max-width: 1024px){
  .page-shell{
    grid-template-columns:1fr;
  }
  .sidebar{
    display:none;
    position:static;
    max-height:none;
  }
  .sidebar.open{display:block}
  .mobile-toggle{
    display:flex;
    align-items:center;
    justify-content:center;
    padding:13px 16px;
    border-radius:14px;
    background:linear-gradient(135deg, var(--primary), #3289ff);
    color:#fff;
    font-weight:700;
    border:none;
  }
}
@media (max-width: 768px){
  .nav{
    padding:14px 0;
    flex-direction:column;
    align-items:flex-start;
  }
  .nav-links{
    gap:12px;
  }
  .hero,.card{padding:22px}
  .check-grid,.split-grid,.book-grid{grid-template-columns:1fr}
}