:root {
  --bg: #080c14;
  --panel: #0e1522;
  --ink: #f4f7fb;
  --muted: #9ba7b8;
  --line: rgba(255,255,255,.11);
  --blue: #0056b3;
  --cyan: #69b8ff;
  --green: #28a745;
  --card-bg: #0e1522;
  --card-border: rgba(255, 255, 255, 0.1);
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

body.light-theme {
  --bg: #f8fafc;
  --panel: #ffffff;
  --ink: #0f172a;
  --muted: #475569;
  --line: rgba(0, 0, 0, 0.1);
  --blue: #0056b3;
  --cyan: #0284c7;
  --green: #16a34a;
  --card-bg: #ffffff;
  --card-border: rgba(0, 0, 0, 0.08);
  --shadow: 0 10px 25px rgba(0, 0, 0, 0.06);
}

* { box-sizing:border-box; }
html { scroll-behavior:smooth; background:var(--bg); }
body { margin:0; background:var(--bg); color:var(--ink); font-family:Inter, "Helvetica Neue", Arial, sans-serif; -webkit-font-smoothing:antialiased; transition: background 0.3s ease, color 0.3s ease; }
a { color:inherit; text-decoration:none; }
button,input { font:inherit; }
button,a { -webkit-tap-highlight-color:transparent; }
.shell { width:min(1180px, calc(100% - 48px)); margin-inline:auto; }

.is-hidden { display: none !important; }

/* Header */
.site-header { position:sticky; top:0; z-index:50; background:var(--panel); border-bottom:1px solid var(--line); backdrop-filter:blur(18px); -webkit-backdrop-filter:blur(18px); transition: background 0.3s ease; }
.nav-wrap { min-height:76px; display:flex; align-items:center; justify-content:space-between; gap:24px; position:relative; }
.brand { display:flex; align-items:center; gap:12px; }
.brand-logo { height:46px; width:auto; display:block; filter: drop-shadow(0 2px 4px rgba(0,0,0,0.15)); }

.top-nav { display:flex; align-items:center; gap:20px; color:var(--ink); font-size:.84rem; }
.top-nav a { transition:.2s; opacity:.9; font-weight: 600; }
.top-nav a:hover { color:var(--cyan); opacity:1; }

.theme-toggle-btn {
  background: var(--line);
  color: var(--ink);
  border: 1px solid var(--line);
  padding: 8px 16px;
  border-radius: 20px;
  cursor: pointer;
  font-size: 0.8rem;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all 0.25s ease;
}
.theme-toggle-btn:hover {
  background: var(--blue);
  color: #ffffff;
  border-color: var(--blue);
}

/* Mobile Hamburger Menu Button */
.mobile-menu-btn {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 32px;
  height: 22px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0;
  z-index: 60;
}
.mobile-menu-btn span {
  display: block;
  width: 100%;
  height: 3px;
  background-color: var(--ink);
  border-radius: 3px;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.mobile-menu-btn.active span:nth-child(1) {
  transform: translateY(9.5px) rotate(45deg);
}
.mobile-menu-btn.active span:nth-child(2) {
  opacity: 0;
  transform: translateX(-10px);
}
.mobile-menu-btn.active span:nth-child(3) {
  transform: translateY(-9.5px) rotate(-45deg);
}

/* Hero */
.portal-hero { padding-block: 50px 24px; text-align: left; }
.portal-hero h1 { font-size: clamp(2.2rem, 4vw, 3.4rem); line-height: 1.1; letter-spacing: -.03em; margin: 16px 0 18px; color: var(--ink); font-weight: 900; }
.hero-deck { max-width: 820px; color: var(--muted); font-size: 1.08rem; line-height: 1.7; margin: 0 0 28px; }

/* Filter Bar */
.category-filter-bar { display: flex; gap: 10px; flex-wrap: wrap; margin: 24px 0 32px; }
.filter-btn { border: 1px solid var(--line); background: var(--panel); color: var(--muted); padding: 10px 18px; font-size: 0.8rem; font-weight: 700; border-radius: 24px; cursor: pointer; transition: all 0.25s ease; }
.filter-btn:hover, .filter-btn.active { color: #ffffff; border-color: var(--blue); background: var(--blue); box-shadow: 0 0 16px rgba(0, 86, 179, 0.3); transform: translateY(-1px); }

/* Articles Grid */
.articles-grid-section { padding-block: 10px 80px; }
.articles-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; width: 100%; }

.article-card { display: flex; flex-direction: column; background: var(--card-bg); border: 1px solid var(--card-border); border-radius: 14px; overflow: hidden; transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1); position: relative; box-shadow: var(--shadow); }
.article-card:hover { transform: translateY(-6px); border-color: var(--cyan); box-shadow: 0 20px 40px rgba(0, 86, 179, 0.2); }

.card-image-wrap { width: 100%; height: 200px; position: relative; overflow: hidden; background: var(--bg); }
.card-image-wrap img { width: 100%; height: 100%; object-fit: cover; display: block; transition: transform 0.5s ease; }
.article-card:hover .card-image-wrap img { transform: scale(1.08); }

.card-category-badge { position: absolute; top: 14px; left: 14px; background: rgba(8, 12, 20, 0.88); backdrop-filter: blur(10px); color: #ffffff; font-size: 0.72rem; font-weight: 800; padding: 5px 12px; border-radius: 20px; border: 1px solid rgba(255, 255, 255, 0.2); text-transform: uppercase; letter-spacing: 0.05em; z-index: 2; }
.card-content { padding: 24px; display: flex; flex-direction: column; flex-grow: 1; }
.card-num { font-size: 0.72rem; font-weight: 800; color: var(--cyan); letter-spacing: 0.1em; margin-bottom: 8px; }
.card-title { font-size: 1.15rem; line-height: 1.35; margin: 0 0 12px; font-weight: 800; color: var(--ink); }
.card-title a { color: var(--ink); transition: color 0.2s ease; }
.card-title a:hover { color: var(--cyan); }
.card-excerpt { font-size: 0.88rem; line-height: 1.65; color: var(--muted); margin: 0 0 20px; flex-grow: 1; }
.card-meta { display: flex; align-items: center; justify-content: space-between; padding-top: 16px; border-top: 1px solid var(--line); font-size: 0.76rem; color: var(--muted); }
.card-meta .read-more { color: var(--cyan); font-weight: 700; }

/* Article Detail */
.article-hero { padding-block: 50px 32px; border-bottom: 1px solid var(--line); }
.breadcrumbs { display: flex; align-items: center; gap: 8px; color: var(--muted); font-size: 0.75rem; margin-bottom: 20px; }
.eyebrow { color: var(--cyan); font-size: 0.72rem; font-weight: 800; letter-spacing: 0.18em; text-transform: uppercase; }
.article-hero h1 { font-size: clamp(1.8rem, 3.4vw, 2.6rem); line-height: 1.25; max-width: 860px; margin: 12px 0 18px; color: var(--ink); font-weight: 900; }
.article-deck { max-width: 820px; color: var(--muted); font-size: 1.1rem; line-height: 1.65; margin: 0 0 24px; }

.byline { display: flex; align-items: center; gap: 12px; margin-top: 20px; }
.mini-monogram { width: 42px; height: 42px; border-radius: 50%; display: grid; place-items: center; font-weight: 800; font-size: 0.85rem; }

.article-layout { display: block; width: 100%; max-width: 820px; margin: 0 auto; padding-block: 40px 80px; }
.article-body { width: 100%; color: var(--ink); }
.article-body > p, .article-body section > p { font-size: 1.08rem; line-height: 1.85; margin: 0 0 24px; }
.article-lead-image { width: 100%; max-height: 460px; object-fit: cover; border-radius: 12px; margin-block: 20px 32px; border: 1px solid var(--line); }
.content-photo-card { margin-block: 32px; border-radius: 12px; overflow: hidden; border: 1px solid var(--line); background: var(--panel); }
.content-photo-card img { width: 100%; height: 360px; object-fit: cover; display: block; }
.content-photo-card figcaption { padding: 14px 20px; font-size: 0.82rem; color: var(--muted); background: var(--panel); font-style: italic; border-top: 1px solid var(--line); }
.quote-box { background: var(--panel); border-left: 4px solid var(--blue); padding: 24px 28px; border-radius: 0 12px 12px 0; margin-block: 28px; }
.quote-box p { font-size: 1.05rem; line-height: 1.65; color: var(--ink); font-style: italic; margin: 0 0 12px; }
.quote-box span { font-size: 0.8rem; font-weight: 700; color: var(--cyan); text-transform: uppercase; letter-spacing: 0.1em; }
.benefit-list { padding-left: 20px; color: var(--ink); margin: 20px 0; }
.benefit-list li { margin-bottom: 12px; font-size: 1.02rem; line-height: 1.7; }
.benefit-list strong { color: var(--ink); }
.action-list { list-style: none; padding: 0; margin: 20px 0; }
.action-list li { display: grid; grid-template-columns: 44px 1fr; gap: 16px; border-top: 1px solid var(--line); padding: 20px 0; }
.action-list li > span { color: var(--cyan); font-size: 0.75rem; font-weight: 800; }
.action-list h3 { font-size: 1.1rem; color: var(--ink); margin: 0 0 6px; }
.action-list p { font-size: 0.9rem; line-height: 1.65; color: var(--muted); margin: 0; }
.article-cta { padding: 36px; margin-top: 60px; background: var(--panel); border: 1px solid var(--line); border-radius: 12px; }
.article-cta h2 { font-size: 1.8rem; margin: 12px 0 16px; color: var(--ink); }
.btn-primary { display: inline-flex; align-items: center; justify-content: center; min-height: 48px; padding: 0 24px; background: var(--blue); color: white; font-size: 0.85rem; font-weight: 800; border-radius: 24px; transition: .2s; }
.btn-primary:hover { background: #004494; transform: translateY(-2px); }
.site-footer { border-top: 1px solid var(--line); padding-block: 50px; background: var(--panel); }
.footer-grid { display: grid; grid-template-columns: 1fr 1.5fr .7fr; gap: 40px; }
.footer-grid p { font-size: 0.78rem; line-height: 1.7; color: var(--muted); }
.footer-links { display: flex; flex-direction: column; gap: 10px; font-size: 0.78rem; color: var(--muted); }

@media (max-width: 992px) {
  .articles-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
}

@media (max-width: 768px) {
  .mobile-menu-btn { display: flex; }
  
  .top-nav {
    display: none;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--panel);
    padding: 24px;
    border-bottom: 1px solid var(--line);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
    gap: 16px;
    align-items: stretch;
    text-align: center;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
  }
  .top-nav.active {
    display: flex !important;
  }
  .top-nav a {
    padding: 10px;
    border-radius: 8px;
    background: var(--line);
    font-size: 0.95rem;
  }
  .theme-toggle-btn {
    width: 100%;
    justify-content: center;
    padding: 12px;
  }
  
  .articles-grid { grid-template-columns: 1fr; }
  .category-filter-bar { flex-wrap: nowrap; overflow-x: auto; padding-bottom: 8px; }
  .filter-btn { white-space: nowrap; }
}