:root {
  color-scheme: dark;
  --bg: #0b1020;
  --panel: rgba(11, 17, 31, 0.92);
  --panel-2: rgba(18, 27, 47, 0.92);
  --line: rgba(255, 255, 255, 0.08);
  --line-2: rgba(255, 255, 255, 0.16);
  --text: #edf2ff;
  --muted: #8ea0c1;
  --accent: #7aa2ff;
  --accent-2: rgba(122, 162, 255, 0.16);
  --danger: #ff8a8a;
  --ok: #6ed3a5;
  --radius: 16px;
  --radius-sm: 12px;
  --reader-width: 980px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background: radial-gradient(circle at top, #162241, var(--bg) 56%);
  color: var(--text);
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

body {
  min-height: 100vh;
}

button,
input,
select,
textarea {
  font: inherit;
}

button {
  cursor: pointer;
}

.app-shell {
  display: grid;
  grid-template-columns: 320px minmax(0, 1fr);
  min-height: 100vh;
}

.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 18px;
  background: var(--panel);
  border-right: 1px solid var(--line);
  backdrop-filter: blur(12px);
}

.sidebar-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 10px;
}

.eyebrow {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--muted);
  margin-bottom: 4px;
}

.sidebar-head h1,
.reader-head h2 {
  margin: 0;
  font-size: 24px;
}

.sidebar-meta,
.selection-summary,
.sidebar-note,
.status,
.page-meta,
.zoom-indicator,
.page-actions {
  color: var(--muted);
}

.toolbar.stack {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.toolbar-row.dual,
.toolbar-row.triple {
  display: grid;
  gap: 10px;
}

.toolbar-row.dual {
  grid-template-columns: 1fr 1fr;
}

.toolbar-row.triple {
  grid-template-columns: repeat(3, 1fr);
}

.zoom-row {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto auto;
  gap: 10px;
  align-items: center;
}

#zoom-range {
  width: 100%;
}

.btn {
  appearance: none;
  border: 1px solid var(--line-2);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  transition: transform 0.18s ease, border-color 0.18s ease, background 0.18s ease;
}

.btn:hover {
  transform: translateY(-1px);
  border-color: rgba(255, 255, 255, 0.28);
}

.btn.primary {
  background: var(--accent-2);
  border-color: rgba(122, 162, 255, 0.36);
}

.btn.danger {
  color: var(--danger);
}

.sidebar-note {
  font-size: 12px;
  line-height: 1.45;
}

.status {
  font-size: 13px;
  line-height: 1.45;
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.03);
}

.page-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  overflow: auto;
  padding-right: 4px;
}

.page-list-item {
  display: grid;
  grid-template-columns: 18px auto 1fr auto;
  gap: 10px;
  align-items: center;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid transparent;
  cursor: grab;
}

.page-list-item:hover,
.page-list-item.active,
.page-list-item.drag-over {
  border-color: rgba(122, 162, 255, 0.32);
  background: rgba(122, 162, 255, 0.08);
}

.drag-handle {
  font-size: 16px;
  color: var(--muted);
  user-select: none;
}

.page-list-item input,
.page-strip input {
  width: 16px;
  height: 16px;
  accent-color: var(--accent);
}

.page-name {
  font-size: 13px;
  font-weight: 600;
  word-break: break-word;
}

.page-meta {
  font-size: 11px;
}

.badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 68px;
  padding: 4px 8px;
  border-radius: 999px;
  font-size: 11px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.04);
}

.badge.ok {
  color: var(--ok);
  border-color: rgba(110, 211, 165, 0.24);
  background: rgba(110, 211, 165, 0.1);
}

.reader-shell {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 18px;
}

.reader-head {
  position: sticky;
  top: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 16px;
  border-radius: var(--radius);
  background: rgba(8, 13, 26, 0.82);
  border: 1px solid var(--line);
  backdrop-filter: blur(10px);
}

.reader-head-main {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.zoom-indicator {
  font-size: 13px;
}

.reader {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.page-strip {
  width: min(100%, var(--reader-width));
  margin: 0 auto;
  padding: 0;
}

.page-strip.active .page-strip-head {
  border-color: rgba(122, 162, 255, 0.34);
}

.page-strip-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 10px 2px 10px 4px;
  border-bottom: 1px solid transparent;
}

.page-strip-title {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.page-strip-title strong {
  font-size: 14px;
}

.page-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

.page-actions .btn {
  padding: 7px 10px;
  font-size: 12px;
}

.page-frame {
  position: relative;
  width: 100%;
  overflow: visible;
  background: transparent;
  border: 0;
}

.page-frame img {
  display: block;
  width: 100%;
  height: auto;
  margin: 0 auto;
  background: rgba(255, 255, 255, 0.02);
}

.empty-state {
  width: min(100%, 720px);
  margin: 48px auto 0;
  padding: 48px 24px;
  text-align: center;
  color: var(--muted);
  border: 1px dashed var(--line-2);
  border-radius: var(--radius);
}

@media (max-width: 1120px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
    height: auto;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .page-strip {
    width: 100%;
  }
}