:root {
  --bg: #0b0f14;
  --panel: #111827;
  --panel-2: #0f172a;
  --text: #e5e7eb;
  --muted: #94a3b8;
  --primary: #22d3ee;
  --accent: #a78bfa;
  --border: #1f2937;
  --header-h: 56px;
}

* {
  box-sizing: border-box;
}
html,
body {
  height: 100%;
}
body {
  margin: 0;
  font-family: "Noto Sans JP", system-ui, -apple-system, Segoe UI, Roboto,
    Helvetica, Arial, sans-serif;
  background: radial-gradient(1200px 800px at 10% -10%, #121826 0, #0b0f14 60%);
  color: var(--text);
}

.app-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 14px 20px;
  background: rgba(17, 24, 39, 0.85);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.brand {
  font-weight: 700;
  letter-spacing: 0.02em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.brand-icon {
  width: 22px;
  height: 22px;
  vertical-align: -4px;
  margin-right: 8px;
  filter: drop-shadow(0 2px 6px rgba(0, 0, 0, 0.35));
}
.hamburger {
  display: none;
  width: 38px;
  height: 34px;
  padding: 6px 8px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: rgba(0, 0, 0, 0.2);
  color: var(--text);
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.25);
}
.hamburger span {
  display: block;
  height: 2px;
  background: var(--text);
  margin: 5px 0;
}
.hamburger[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.hamburger[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}
.hamburger[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}
.search-wrap {
  margin-left: auto;
}
.search-wrap input {
  width: min(62vw, 560px);
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 12px;
  outline: none;
}
.search-wrap input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 2px rgba(34, 211, 238, 0.2);
}

.layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  min-height: calc(100vh - 56px);
}
.sidebar {
  border-right: 1px solid var(--border);
  background: linear-gradient(0deg, var(--panel-2), var(--panel));
  padding: 16px 14px;
}
.menu-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
}
.menu-overlay.show {
  display: block;
}
.sidebar-section + .sidebar-section {
  margin-top: 18px;
}
.section-title {
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--muted);
}
.category-nav {
  display: grid;
  gap: 6px;
}
.category-nav button {
  text-align: left;
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 10px;
  cursor: pointer;
}
.category-nav button.active {
  border-color: var(--primary);
  background: rgba(34, 211, 238, 0.08);
}

.content {
  padding: 18px;
}
.breadcrumbs {
  color: var(--muted);
  margin-bottom: 6px;
  font-size: 12px;
}
.result-stats {
  color: var(--muted);
  margin-bottom: 14px;
  font-size: 13px;
}
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 14px;
}
.card {
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  background: linear-gradient(
    180deg,
    rgba(17, 24, 39, 0.7),
    rgba(15, 23, 42, 0.7)
  );
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.28);
}
.thumb-wrap {
  position: relative;
  aspect-ratio: 4/3;
  background: #0b1220;
}
.thumb {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.thumb-badge {
  position: absolute;
  inset: 10px auto auto 10px;
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: #ffffff;
  padding: 4px 8px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.35);
}
.thumb-badge[data-type="pdf"] {
  background: #6d28d9; /* solid violet */
  border-color: #4c1d95;
}
.thumb-badge[data-type="image"] {
  background: #0ea5b7; /* solid cyan */
  border-color: #0a5e68;
}
.meta {
  padding: 10px 12px;
}
.name {
  font-size: 14px;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.path {
  font-size: 12px;
  color: var(--muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Lightbox */
.lightbox {
  position: fixed;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.85);
}
.lightbox.show {
  display: flex;
}
.lightbox-inner {
  max-width: 90vw;
  max-height: 86vh;
  display: grid;
  gap: 8px;
}
.lightbox img {
  max-width: 90vw;
  max-height: 80vh;
  object-fit: contain;
}
.lightbox-caption {
  text-align: center;
  color: var(--muted);
  font-size: 13px;
}
.lightbox-hint {
  position: absolute;
  bottom: 12px;
  left: 50%;
  transform: translateX(-50%);
  color: var(--muted);
  font-size: 12px;
  background: rgba(0, 0, 0, 0.35);
  border: 1px solid var(--border);
  padding: 4px 8px;
  border-radius: 8px;
}
.lightbox-close,
.lightbox-prev,
.lightbox-next {
  position: absolute;
  top: 14px;
  background: rgba(0, 0, 0, 0.5);
  color: var(--text);
  border: 1px solid var(--border);
  padding: 6px 10px;
  border-radius: 8px;
  cursor: pointer;
  z-index: 30;
}
.lightbox-close {
  right: 14px;
}
.lightbox-prev {
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
}
.lightbox-next {
  right: 14px;
  top: 50%;
  transform: translateY(-50%);
}

@media (max-width: 860px) {
  .app-header {
    flex-wrap: wrap;
    padding: 10px 12px;
    gap: 10px;
  }
  .brand {
    font-size: 16px;
  }
  .search-wrap {
    margin-left: 0;
    width: 100%;
    order: 3;
  }
  .search-wrap input {
    width: 100%;
  }
  .layout {
    grid-template-columns: 1fr;
  }
  .sidebar {
    order: 2;
    position: fixed;
    left: 0;
    top: var(--header-h);
    right: auto;
    bottom: 0;
    width: min(84vw, 340px);
    border-right: 0;
    height: calc(100vh - var(--header-h));
    overflow: auto;
    transform: translateX(-104%);
    transition: transform 0.25s ease, box-shadow 0.25s ease;
    z-index: 20;
    box-shadow: 0 0 0 rgba(0, 0, 0, 0);
  }
  .sidebar.show {
    transform: translateX(0);
    border-right: 1px solid var(--border);
    box-shadow: 8px 0 20px rgba(0, 0, 0, 0.35);
  }
  .content {
    order: 1;
  }
  .hamburger {
    display: inline-block;
  }
  .menu-overlay {
    z-index: 15;
  }
  .grid {
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 10px;
  }
}

/* PDF frame & lightbox extras */
.pdf-frame {
  display: none;
  width: 90vw;
  height: 80vh;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #0b1220;
}
.lightbox .lightbox-download,
.lightbox .lightbox-back {
  position: absolute;
  left: 14px;
  top: 14px;
  text-decoration: none;
  color: var(--text);
  border: 1px solid var(--border);
  padding: 6px 10px;
  border-radius: 8px;
  background: rgba(0, 0, 0, 0.5);
  z-index: 31;
}
.lightbox .lightbox-download {
  left: auto;
  right: 54px;
  top: 14px;
}
.lightbox .lightbox-back {
  left: 14px;
  top: 14px;
}