/* ════════════════════════════════════════
   APP SHELL
════════════════════════════════════════ */
.app {
  display: flex;
  min-height: 100dvh;
}

/* ════════════════════════════════════════
   SIDEBAR  (desktop only)
════════════════════════════════════════ */
.sidebar {
  width: var(--sidebar);
  flex-shrink: 0;
  background: var(--white);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  padding: 22px 16px 20px;
  position: sticky;
  top: 0;
  height: 100dvh;
  overflow-y: auto;
}

.sidebar-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 20px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--border);
}
.dd-logo { width: 36px; height: 36px; flex-shrink: 0; }
.brand-name {
  font-family: var(--fh);
  font-style: italic;
  font-size: 0.9rem;
  color: var(--dark);
  line-height: 1.35;
}
.brand-sub { font-size: 10px; color: var(--muted); margin-top: 2px; }

.sidebar-count {
  font-size: 11px; font-weight: 600;
  color: var(--blue);
  background: rgba(55,122,255,.08);
  border: 1px solid rgba(55,122,255,.15);
  padding: 4px 10px;
  border-radius: 99px;
  display: inline-block;
  margin-bottom: 16px;
  align-self: flex-start;
}

.about-blurb {
  font-size: 11.5px; color: var(--muted);
  line-height: 1.65; margin-bottom: 14px;
}

.sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: 1px;
  flex: 1;
}
.cat-btn {
  padding: 8px 10px;
  border-radius: var(--r-sm);
  font-size: 13px; font-weight: 500;
  text-align: left;
  color: var(--muted);
  transition: background .12s, color .12s;
  width: 100%;
}
.cat-btn:hover { background: var(--bg); color: var(--dark); }
.cat-btn.active {
  background: rgba(55,122,255,.1);
  color: var(--blue);
  font-weight: 600;
}

.sidebar-add-btn {
  margin-top: 16px;
  width: 100%;
  background: var(--blue); color: white;
  font-size: 13px; font-weight: 600;
  padding: 10px;
  border-radius: var(--r-sm);
  transition: background .15s, box-shadow .15s;
  box-shadow: 0 2px 8px rgba(55,122,255,.3);
}
.sidebar-add-btn:hover { background: var(--dark); box-shadow: 0 2px 8px rgba(14,42,94,.25); }

/* ── Footer links ── */
.legal-links {
  font-size: 11px; color: var(--muted);
  padding: 12px 0 0;
  border-top: 1px solid var(--border);
  margin-top: 12px;
  display: flex; gap: 12px; flex-wrap: wrap;
}
.legal-links a { color: var(--muted); text-decoration: none; transition: color .12s; }
.legal-links a:hover { color: var(--blue); }

/* ── Logo images ── */
.logo-img    { width: 36px; height: 36px; object-fit: contain; }
.logo-img-sm { width: 28px; height: 28px; object-fit: contain; }

/* ════════════════════════════════════════
   MAIN
════════════════════════════════════════ */
.main {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

/* ── Mobile topbar ── */
.topbar {
  display: none;
  background: var(--white);
  border-bottom: 1px solid var(--border);
  padding: 11px 16px;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  flex-shrink: 0;
}
.topbar-brand { display: flex; align-items: center; gap: 8px; }
.dd-logo-sm { width: 30px; height: 30px; flex-shrink: 0; }
.topbar .brand-name { font-size: 0.85rem; }
.topbar-count {
  font-size: 11px; font-weight: 600;
  color: var(--blue);
  background: rgba(55,122,255,.08);
  border: 1px solid rgba(55,122,255,.15);
  padding: 3px 10px;
  border-radius: 99px;
  white-space: nowrap;
  flex-shrink: 0;
}

/* ── Mobile catbar ── */
.catbar {
  display: none;
  background: var(--white);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.catbar-scroll {
  display: flex;
  gap: 6px;
  padding: 9px 14px;
  overflow-x: auto;
  scrollbar-width: none;
}
.catbar-scroll::-webkit-scrollbar { display: none; }
.cat-chip {
  padding: 6px 14px;
  border-radius: 99px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--muted);
  font-size: 12px; font-weight: 500;
  white-space: nowrap;
  transition: all .12s;
}
.cat-chip:hover { border-color: var(--blue); color: var(--blue); }
.cat-chip.active {
  background: var(--blue);
  border-color: var(--blue);
  color: white;
  box-shadow: 0 2px 6px rgba(55,122,255,.3);
}

/* ── Content area ── */
.content {
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  transition: opacity .15s ease;
}
.content.nav-fade { opacity: 0; }

/* ── Bottombar ── */
.bottombar {
  background: var(--white);
  border-top: 1px solid var(--border);
  padding: 10px 16px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  flex-shrink: 0;
}
.nav-btn {
  font-size: 13px; font-weight: 500;
  padding: 9px 16px;
  border-radius: var(--r-sm);
  border: 1px solid var(--border);
  background: var(--bg); color: var(--dark);
  transition: all .15s;
}
.nav-btn:hover:not(:disabled) {
  border-color: var(--blue);
  color: var(--blue);
  background: rgba(55,122,255,.05);
}
.nav-btn:disabled { opacity: .3; cursor: default; }
.bottombar-center { display: flex; gap: 8px; }
.btn-exp {
  font-size: 12px; font-weight: 600;
  padding: 9px 14px; border-radius: var(--r-sm);
  background: rgba(141,171,127,.15); color: #3d5e38;
  border: 1px solid rgba(141,171,127,.3);
  transition: background .12s;
}
.btn-exp:hover { background: rgba(141,171,127,.28); }
.btn-art-mob {
  font-size: 12px; font-weight: 600;
  padding: 9px 14px; border-radius: var(--r-sm);
  background: var(--blue); color: white;
  box-shadow: 0 2px 8px rgba(55,122,255,.3);
  transition: background .12s;
}
.btn-art-mob:hover { background: var(--dark); }

/* ════════════════════════════════════════
   RESPONSIVE — layout
════════════════════════════════════════ */

/* Mobile (<768px) */
@media (max-width: 767px) {
  .sidebar     { display: none; }
  .topbar      { display: flex; }
  .catbar      { display: block; }
  .btn-art-mob { display: flex; }
}

/* Tablet (768–1023px) */
@media (min-width: 768px) and (max-width: 1023px) {
  .sidebar     { display: none; }
  .topbar      { display: flex; }
  .catbar      { display: block; }
  .btn-art-mob { display: flex; }
}

/* Desktop (≥1024px) */
@media (min-width: 1024px) {
  .topbar      { display: none; }
  .catbar      { display: none; }
  .btn-art-mob { display: none; }
}

/* Wide desktop (≥1400px) */
@media (min-width: 1400px) {
  .app { max-width: 1400px; margin: 0 auto; }
}