/* ============================================================
   layout-u/style.css — FinanceNet-inspired White Minimal
   金融數據感：白色極簡 + 社群連結 + 2欄布局
   All colors via var(--clr-*); no hardcoded hex except #fff / rgba overlays
   ============================================================ */

/* ── Layout-U: Meta Bar ──────────────────────────────────────── */
.layout-u-meta-bar {
  font-size: 11px;
  border-bottom: 1px solid var(--clr-border);
  padding: 4px var(--space-5);
  color: var(--clr-text-muted);
  display: flex;
  align-items: center;
  gap: 16px;
  background: var(--clr-bg);
  flex-wrap: wrap;
}
.layout-u-meta-bar a {
  color: var(--clr-text-muted);
  transition: color var(--transition);
}
.layout-u-meta-bar a:hover { color: var(--clr-accent); }
.layout-u-meta-sep { color: var(--clr-border); }

/* ── Layout-U: Header ──────────────────────────────────────── */
.layout-u-header {
  background: var(--clr-bg);
  border-bottom: 2px solid var(--clr-accent);
  position: sticky;
  top: 0;
  z-index: 200;
}
.layout-u-header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 70px;
  padding: 0 var(--space-5);
  max-width: var(--container);
  margin: 0 auto;
  gap: var(--space-4);
}
.layout-u-logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-heading);
  font-size: 22px;
  font-weight: 900;
  color: var(--clr-text);
  letter-spacing: .02em;
  flex-shrink: 0;
}
.layout-u-logo img { height: 32px; width: auto; }

/* ── Layout-U: Social Links ─────────────────────────────────── */
.layout-u-social {
  font-size: 12px;
  display: flex;
  gap: 12px;
  color: var(--clr-text-muted);
  align-items: center;
  flex-shrink: 0;
}
.layout-u-social a {
  color: var(--clr-text-muted);
  font-weight: 700;
  padding: 4px 8px;
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-xs);
  transition: color var(--transition), border-color var(--transition), background var(--transition);
}
.layout-u-social a:hover {
  color: var(--clr-accent);
  border-color: var(--clr-accent);
  background: var(--clr-accent-faint);
}

/* ── Layout-U: Nav Bar ──────────────────────────────────────── */
.layout-u-nav {
  background: var(--clr-bg-dark);
}
.layout-u-nav-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--space-5);
  display: flex;
  align-items: center;
  gap: 0;
  overflow-x: auto;
  scrollbar-width: none;
}
.layout-u-nav-inner::-webkit-scrollbar { display: none; }
.layout-u-nav-link {
  display: inline-flex;
  align-items: center;
  padding: 11px 16px;
  font-size: 13px;
  font-weight: 700;
  color: var(--clr-text-inv-muted);
  white-space: nowrap;
  border-bottom: 3px solid transparent;
  transition: color var(--transition), border-color var(--transition);
}
.layout-u-nav-link:hover,
.layout-u-nav-link.active {
  color: var(--clr-accent);
  border-bottom-color: var(--clr-accent);
}

/* ── Layout-U: Featured Grid (2fr + 1fr) ──────────────────── */
.layout-u-featured {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 24px;
  align-items: start;
}
@media (max-width: 768px) {
  .layout-u-featured { grid-template-columns: 1fr; }
}

/* ── Layout-U: Featured Main (left 2/3) ─────────────────────── */
.layout-u-featured-main {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-md);
  background: var(--clr-bg-alt);
  border: 1px solid var(--clr-border);
}
.layout-u-featured-main img {
  width: 100%;
  aspect-ratio: 16/9;
  object-fit: cover;
  display: block;
}
.layout-u-featured-caption {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(to top, rgba(0,0,0,.82) 0%, rgba(0,0,0,0) 100%);
  padding: var(--space-8) var(--space-5) var(--space-5);
}
.layout-u-featured-caption .tag { margin-bottom: var(--space-2); display: inline-flex; }
.layout-u-featured-caption h2 {
  font-family: var(--font-heading);
  font-size: clamp(18px, 2.5vw, 26px);
  font-weight: 900;
  color: #fff;
  line-height: 1.25;
  margin-bottom: var(--space-2);
}
.layout-u-featured-caption h2 a { color: #fff; }
.layout-u-featured-caption h2 a:hover { color: var(--clr-accent); }
.layout-u-featured-caption-meta {
  font-size: 12px;
  color: rgba(255,255,255,.7);
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

/* ── Layout-U: Featured Aside (right 1/3) ───────────────────── */
.layout-u-featured-aside {
  background: var(--clr-bg-alt);
  padding: var(--space-4);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}
.layout-u-aside-search {
  display: flex;
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-sm);
  overflow: hidden;
}
.layout-u-aside-search input {
  flex: 1;
  padding: 8px 12px;
  font-size: 13px;
  border: none;
  outline: none;
  background: var(--clr-bg);
  color: var(--clr-text);
  font-family: var(--font-body);
}
.layout-u-aside-search button {
  padding: 8px 14px;
  background: var(--clr-accent);
  color: #fff;
  font-size: 13px;
  font-weight: 700;
  font-family: var(--font-body);
  border: none;
  cursor: pointer;
  transition: opacity var(--transition);
}
.layout-u-aside-search button:hover { opacity: .85; }
.layout-u-aside-title {
  font-size: 11px;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--clr-accent);
  padding-bottom: var(--space-2);
  border-bottom: 2px solid var(--clr-accent);
  margin-bottom: var(--space-2);
}

/* ── Layout-U: Popular Mini List ───────────────────────────── */
.layout-u-popular-item {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 10px;
  align-items: start;
  padding: var(--space-2) 0;
  border-bottom: 1px solid var(--clr-border);
}
.layout-u-popular-item:last-child { border-bottom: none; }
.layout-u-popular-img {
  width: 56px;
  height: 44px;
  object-fit: cover;
  border-radius: var(--radius-xs);
  background: var(--clr-bg);
  display: block;
}
.layout-u-popular-title {
  font-size: 13px;
  font-weight: 700;
  color: var(--clr-text);
  line-height: 1.35;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.layout-u-popular-title:hover { color: var(--clr-accent); }
.layout-u-popular-date { font-size: 11px; color: var(--clr-text-muted); margin-top: 3px; }

/* ── Layout-U: Article List ────────────────────────────────── */
.layout-u-list-item {
  display: grid;
  grid-template-columns: 90px 1fr;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--clr-border);
  align-items: start;
}
.layout-u-list-item:last-child { border-bottom: none; }
.layout-u-list-img {
  width: 90px;
  height: 68px;
  object-fit: cover;
  border-radius: var(--radius-xs);
  background: var(--clr-bg-alt);
  display: block;
  flex-shrink: 0;
}
.layout-u-list-cat {
  font-size: 10px;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: .05em;
  color: var(--clr-accent);
  margin-bottom: 3px;
  display: block;
}
.layout-u-list-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--clr-text);
  line-height: 1.35;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 4px;
}
.layout-u-list-title:hover { color: var(--clr-accent); }
.layout-u-list-footer {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

/* ── Layout-U: Read Time ────────────────────────────────────── */
.layout-u-read-time {
  font-size: 11px;
  color: var(--clr-text-muted);
}
.layout-u-read-time::before {
  content: '⏱ ';
}

/* ── Layout-U: CTA Banner (Professional) ───────────────────── */
.layout-u-cta {
  background: var(--clr-bg-alt);
  border: 1px solid var(--clr-border);
  border-left: 4px solid var(--clr-accent);
  border-radius: var(--radius-md);
  padding: var(--space-8) var(--space-10);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
  flex-wrap: wrap;
}
.layout-u-cta-text h2 {
  font-family: var(--font-heading);
  font-size: clamp(20px, 2.5vw, 28px);
  font-weight: 900;
  color: var(--clr-text);
  margin-bottom: var(--space-2);
}
.layout-u-cta-text p {
  font-size: 14px;
  color: var(--clr-text-muted);
  line-height: 1.6;
  max-width: 480px;
}

/* ── Layout-U: Content + Sidebar ───────────────────────────── */
.layout-u-two-col {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: var(--space-8);
  align-items: start;
}
@media (max-width: 900px) {
  .layout-u-two-col { grid-template-columns: 1fr; }
}

/* ── Layout-U: Sidebar ──────────────────────────────────────── */
.layout-u-sidebar { /* inherits global sidebar-widget styles */ }
.layout-u-sidebar-sticky { position: sticky; top: 80px; }

/* ── Layout-U: Article page overrides ──────────────────────── */
.layout-u-article-meta {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: 13px;
  color: var(--clr-text-muted);
  margin-bottom: var(--space-5);
  padding: var(--space-3) var(--space-4);
  background: var(--clr-bg-alt);
  border-radius: var(--radius-sm);
  border: 1px solid var(--clr-border);
  flex-wrap: wrap;
}
.layout-u-article-meta strong { color: var(--clr-text); font-weight: 700; }
.layout-u-data-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 8px;
  background: var(--clr-accent-faint);
  border: 1px solid var(--clr-accent);
  border-radius: var(--radius-xs);
  font-size: 11px;
  font-weight: 700;
  color: var(--clr-accent);
  text-transform: uppercase;
  letter-spacing: .05em;
}

/* ── Responsive adjustments ────────────────────────────────── */
@media (max-width: 640px) {
  .layout-u-meta-bar { display: none; }
  .layout-u-header-inner { height: 58px; }
  .layout-u-social { display: none; }
  .layout-u-cta {
    flex-direction: column;
    text-align: center;
    padding: var(--space-6);
  }
}