:root {
  --bg: #0d0d0d;
  --fg: #f5f5f5;
  --panel: #1a1a1a;
  --muted: #999;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, sans-serif;
  background: var(--bg);
  color: var(--fg);
}

.topbar {
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1rem;
  background: black;
  border-bottom: 1px solid #222;
}

.layout {
  display: grid;
  grid-template-columns: 280px 1fr;
}

/* ===== FILTERS ===== */

.filters {
  background: var(--panel);
  padding: 1rem;
}

.filters-header {
  display: none;
  align-items: center;
  gap: 10px;
}

.filters label {
  display: block;
  margin-top: 1rem;
  font-size: 0.85rem;
  color: var(--muted);
}

.filters select {
  width: 100%;
  margin-top: 0.25rem;
  padding: 0.4rem;
  background: #000;
  color: var(--fg);
  border: 1px solid #333;
}

fieldset {
  margin-top: 1.5rem;
  border: 1px solid #333;
}

legend {
  padding: 0 6px;
  font-size: 0.8rem;
}

/* ===== LIBRARY ===== */

.library {
  padding: 1rem;
  display: grid;
  gap: 0.75rem;
}

.hint {
  color: var(--muted);
}

.doc {
  background: #1f1f1f;
  padding: 0.75rem;
  border-radius: 6px;
  cursor: pointer;
}

.doc small {
  color: var(--muted);
}

/* ===== VIEWER ===== */

.viewer {
  position: fixed;
  inset: 0;
  background: black;
  display: none;
  z-index: 2000;
}

.viewer.open {
  display: block;
}

.viewer iframe {
  width: 100%;
  height: 100%;
  border: none;
}

#closeViewer {
  position: absolute;
  top: 10px;
  right: 10px;
  font-size: 22px;
  background: none;
  border: none;
  color: white;
}

/* ===== MOBILE ===== */

@media (max-width: 899px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .filters {
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    width: 85%;
    max-width: 320px;
    transform: translateX(-100%);
    transition: transform 0.3s ease;
    z-index: 1500;
  }

  .filters.open {
    transform: translateX(0);
  }

  .filters-header {
    display: flex;
  }
}