:root {
  color-scheme: light;
  --bg: #efe6d8;
  --ink: #1f1a16;
  --muted: #5f594f;
  --accent: #c46b3f;
  --accent-ink: #ffffff;
  --panel: #ffffff;
  --border: #e6d9c6;
  --shadow: 0 20px 50px rgba(40, 25, 15, 0.12);
  --shadow-soft: 0 10px 24px rgba(40, 25, 15, 0.08);
  --panel-height: clamp(420px, 70vh, 860px);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "IBM Plex Sans", "Work Sans", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at 12% 8%, #fff7e6 0%, transparent 48%),
    radial-gradient(circle at 85% 14%, #ffe4cf 0%, transparent 42%),
    linear-gradient(180deg, #f8f1e6 0%, var(--bg) 100%);
}

input,
select,
button {
  font: inherit;
}

.app {
  min-height: 100vh;
  padding: 28px clamp(18px, 4vw, 40px) 36px;
  display: flex;
  flex-direction: column;
  gap: 22px;
}

.topbar {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: flex-end;
  gap: 18px;
  padding: 18px 22px;
  border-radius: 18px;
  border: 1px solid var(--border);
  background: var(--panel);
  box-shadow: var(--shadow);
  animation: rise 0.6s ease both;
}

.brand .title {
  font-size: 20px;
  font-weight: 600;
  letter-spacing: 0.01em;
}

.brand .status {
  margin-top: 6px;
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}

.top-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.control {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.control-label {
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

.control input,
.control select {
  min-width: 210px;
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: #fffdf9;
  color: var(--ink);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.6);
}

.control input:disabled,
.control select:disabled {
  background: #f3ede2;
  color: var(--muted);
}

.content {
  display: grid;
  grid-template-columns: minmax(260px, 360px) minmax(0, 1fr);
  gap: 22px;
  align-items: stretch;
}

.catalog,
.viewer {
  animation: rise 0.65s ease both;
}

.catalog {
  animation-delay: 0.05s;
}

.viewer {
  animation-delay: 0.12s;
}

.lock-card {
  padding: 22px;
  border-radius: 18px;
  border: 1px solid var(--border);
  background: var(--panel);
  box-shadow: var(--shadow-soft);
}

.lock-card h2 {
  margin: 0 0 8px;
  font-size: 20px;
}

.lock-card p {
  margin: 0 0 16px;
  color: var(--muted);
}

.lock-field {
  display: flex;
  gap: 10px;
  align-items: center;
  margin-bottom: 12px;
}

.lock-field input {
  flex: 1;
  padding: 12px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: #fffdf9;
}

.lock-field button {
  padding: 12px 16px;
  border-radius: 12px;
  border: none;
  background: var(--accent);
  color: var(--accent-ink);
  font-weight: 600;
  cursor: pointer;
}

.error {
  margin-top: 12px;
  font-size: 13px;
  color: #b12f1f;
}

.catalog-body {
  display: flex;
  flex-direction: column;
  gap: 16px;
  height: var(--panel-height);
  min-height: 0;
}

.tag-bar {
  padding: 16px;
  border-radius: 16px;
  border: 1px solid var(--border);
  background: var(--panel);
  box-shadow: var(--shadow-soft);
}

.tag-title {
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 10px;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag-chip {
  border-radius: 999px;
  border: 1px solid var(--border);
  padding: 6px 12px;
  background: #fffaf2;
  color: var(--muted);
  cursor: pointer;
  font-size: 12px;
  letter-spacing: 0.04em;
}

.tag-chip.is-active {
  background: var(--accent);
  color: var(--accent-ink);
  border-color: var(--accent);
}

.catalog-list {
  display: grid;
  gap: 12px;
  overflow: auto;
  min-height: 0;
  flex: 1;
}

.item-card {
  text-align: left;
  border-radius: 16px;
  border: 1px solid transparent;
  padding: 14px 16px;
  background: var(--panel);
  box-shadow: var(--shadow-soft);
  cursor: pointer;
  transition: transform 0.18s ease, border-color 0.18s ease;
}

.item-card:hover {
  transform: translateY(-1px);
  border-color: #e3cbb2;
}

.item-card.is-active {
  border-color: var(--accent);
}

.item-title {
  font-weight: 600;
  margin-bottom: 6px;
}

.item-meta {
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 6px;
}

.item-notes {
  font-size: 13px;
  color: var(--muted);
}

.item-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 8px;
}

.item-tag {
  padding: 4px 8px;
  border-radius: 999px;
  background: #f7f0e5;
  font-size: 11px;
  color: var(--muted);
}

.empty-state {
  padding: 16px;
  border-radius: 14px;
  border: 1px dashed var(--border);
  color: var(--muted);
  text-align: center;
  background: rgba(255, 255, 255, 0.7);
}

.viewer-card {
  display: flex;
  flex-direction: column;
  border-radius: 20px;
  border: 1px solid var(--border);
  background: var(--panel);
  box-shadow: var(--shadow);
  padding: 18px;
  gap: 12px;
  height: var(--panel-height);
}

.viewer-header {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
}

.viewer-title {
  font-weight: 600;
  font-size: 16px;
}

.viewer-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.link-button,
.ghost-button {
  padding: 8px 14px;
  border-radius: 999px;
  border: 1px solid var(--border);
  text-decoration: none;
  font-size: 13px;
  color: var(--muted);
  background: #fffaf2;
}

.link-button.is-disabled {
  opacity: 0.6;
  pointer-events: none;
}

.ghost-button {
  cursor: pointer;
  background: #fff;
}

.ghost-button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.viewer-status {
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}

.viewer-body {
  flex: 1;
  min-height: 0;
  border-radius: 16px;
  border: 1px solid var(--border);
  background: #f9f3e7;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.viewer-body.is-djvu {
  align-items: stretch;
  justify-content: stretch;
}

.viewer-placeholder,
.viewer-error {
  padding: 24px;
  text-align: center;
  color: var(--muted);
}

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

.viewer-djvu {
  width: 100%;
  height: 100%;
}

.is-hidden {
  display: none;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 980px) {
  .content {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  :root {
    --panel-height: clamp(360px, 62vh, 640px);
  }

  .topbar {
    padding: 16px;
  }

  .control input,
  .control select {
    min-width: 100%;
  }

  .lock-field {
    flex-direction: column;
    align-items: stretch;
  }

  .viewer-card {
    padding: 14px;
  }
}