:root {
  color-scheme: dark;
  --bg: #121417;
  --viewer: #0e1012;
  --card: #1b1f24;
  --border: #2c333c;
  --text: #e8eaed;
  --muted: #9aa3ad;
  --accent: #7dcea0;
  --accent-text: #102016;
  --danger: #f2a3a3;
  --danger-bg: #3a1f22;
  --error: #f2a3a3;
  --error-bg: #3a1f22;
  --focus: #8ab4ff;
  --page-shadow: 0 10px 28px rgba(0, 0, 0, 0.45);
  --radius: 10px;
  font-family: "Segoe UI", system-ui, sans-serif;
}

@media (prefers-color-scheme: light) {
  :root {
    color-scheme: light;
    --bg: #f4f6f8;
    --viewer: #cfd6de;
    --card: #ffffff;
    --border: #d7dee6;
    --text: #1a1f24;
    --muted: #5b6570;
    --accent: #1f7a4c;
    --accent-text: #ffffff;
    --danger: #9b1c1c;
    --danger-bg: #fdecec;
    --error: #9b1c1c;
    --error-bg: #fdecec;
    --focus: #1a5fb4;
    --page-shadow: 0 8px 22px rgba(26, 31, 36, 0.18);
  }
}

* {
  box-sizing: border-box;
}

.icons {
  position: absolute;
  width: 0;
  height: 0;
  overflow: hidden;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--viewer);
  color: var(--text);
  line-height: 1.45;
}

.toolbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem 1rem;
  padding: 0.65rem 0.9rem;
  background: var(--card);
  border-bottom: 1px solid var(--border);
}

.brand {
  display: flex;
  flex-direction: column;
  min-width: 8rem;
}

.brand strong {
  font-size: 0.95rem;
  letter-spacing: -0.02em;
}

.meta {
  color: var(--muted);
  font-size: 0.75rem;
}

.groups {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.55rem 0.7rem;
  flex: 1;
}

.group {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  padding-right: 0.7rem;
  border-right: 1px solid var(--border);
}

.group:last-child {
  border-right: 0;
  padding-right: 0;
  margin-left: auto;
}

.btn,
.icon-btn,
.field input,
.field select {
  font: inherit;
}

.btn,
.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  border-radius: 8px;
  cursor: pointer;
}

.btn {
  padding: 0.4rem 0.7rem;
  font-size: 0.85rem;
  font-weight: 600;
}

.icon-btn {
  width: 2.1rem;
  height: 2.1rem;
  padding: 0;
}

.btn svg,
.icon-btn svg {
  width: 1.1rem;
  height: 1.1rem;
  display: block;
}

.btn:hover,
.icon-btn:hover,
.btn.primary:hover {
  filter: brightness(1.08);
}

.icon-btn.active {
  background: var(--accent);
  color: var(--accent-text);
  border-color: var(--accent);
}

.btn.primary {
  background: var(--accent);
  color: var(--accent-text);
  border-color: var(--accent);
}

.icon-btn.danger:hover,
.icon-btn.danger:focus-visible {
  background: var(--danger-bg);
  color: var(--danger);
  border-color: var(--danger);
}

.btn:focus-visible,
.icon-btn:focus-visible,
.field input:focus-visible,
.field select:focus-visible,
.color-field input:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

.style-group {
  gap: 0.55rem;
}

.field {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  color: var(--muted);
  font-size: 0.75rem;
}

.field input[type="number"],
.field select {
  width: 3.6rem;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  border-radius: 6px;
  padding: 0.28rem 0.35rem;
}

.field input[type="range"] {
  width: 4.2rem;
  accent-color: var(--accent);
}

.color-field {
  display: flex;
  align-items: center;
}

.color-field input {
  width: 2.1rem;
  height: 2.1rem;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: transparent;
  cursor: pointer;
}

.zoom-label {
  min-width: 3.2rem;
  text-align: center;
  font-size: 0.8rem;
  color: var(--muted);
}

.viewer {
  min-height: calc(100vh - 4.5rem);
  padding: 1.25rem 1rem 2.5rem;
  overflow: auto;
}

.empty,
.loading {
  max-width: 36rem;
  margin: 12vh auto 0;
  text-align: center;
  color: var(--muted);
}

.empty-actions {
  display: flex;
  justify-content: center;
  gap: 0.6rem;
  margin-top: 0.9rem;
}

.empty .btn {
  margin: 0;
}

.error {
  margin: 1rem auto 0;
  padding: 0.7rem 0.85rem;
  max-width: 28rem;
  background: var(--error-bg);
  color: var(--error);
  border-radius: 8px;
}

.pages {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.35rem;
}

.page-insert {
  display: flex;
  justify-content: center;
  width: min(100%, 36rem);
}

.page-insert-btn {
  border: 1px dashed var(--border);
  background: transparent;
  color: var(--muted);
  border-radius: 999px;
  padding: 0.2rem 0.75rem;
  font: inherit;
  font-size: 0.75rem;
  cursor: pointer;
}

.page-insert-btn:hover,
.page-insert-btn:focus-visible {
  color: var(--accent);
  border-color: var(--accent);
}

.page-insert-btn:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

.page-block {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.35rem;
  margin-block: 0.45rem;
}

.page-remove-btn {
  border: 1px solid var(--border);
  background: transparent;
  color: var(--danger);
  border-radius: 999px;
  padding: 0.2rem 0.75rem;
  font: inherit;
  font-size: 0.75rem;
  cursor: pointer;
}

.page-remove-btn:hover,
.page-remove-btn:focus-visible {
  background: var(--danger-bg);
  border-color: var(--danger);
}

.page-remove-btn:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

.page-shell {
  position: relative;
  box-shadow: var(--page-shadow);
  background: #fff;
  overflow: hidden;
}

.page-shell .canvas-container {
  box-shadow: none;
  background: #fff;
}

.text-layer {
  position: absolute;
  left: 0;
  top: 0;
  transform: scale(var(--page-zoom, 1));
  transform-origin: 0 0;
  line-height: 1;
  pointer-events: none;
  user-select: none;
  z-index: 2;
}

.page-shell.text-selectable .text-layer {
  pointer-events: auto;
  user-select: text;
  cursor: text;
}

.text-layer span {
  position: absolute;
  white-space: pre;
  color: transparent;
  transform-origin: 0 0;
}

.text-layer ::selection {
  background: rgba(80, 140, 255, 0.35);
}

.viewer.dragover {
  outline: 2px dashed var(--accent);
  outline-offset: -8px;
}

.dialog {
  width: min(720px, calc(100vw - 2rem));
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  border-radius: var(--radius);
  padding: 1rem 1.1rem 1.15rem;
}

.dialog::backdrop {
  background: rgba(0, 0, 0, 0.55);
}

.dialog-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

.dialog-head h2 {
  margin: 0;
  font-size: 1.05rem;
  letter-spacing: -0.02em;
}

.dialog-actions {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.json-label {
  display: block;
  margin-bottom: 0.45rem;
  color: var(--muted);
  font-size: 0.8rem;
}

.json-output {
  display: block;
  width: 100%;
  min-height: min(50vh, 22rem);
  max-height: min(65vh, 32rem);
  margin: 0;
  overflow: auto;
  padding: 0.8rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
  font: 0.82rem/1.45 ui-monospace, "Cascadia Code", Consolas, monospace;
  white-space: pre;
  word-break: break-word;
  resize: vertical;
}

.json-error {
  margin: 0.65rem 0 0;
  color: var(--error);
  font-size: 0.8rem;
}

@media (max-width: 900px) {
  .group {
    border-right: 0;
    padding-right: 0;
  }

  .group:last-child {
    margin-left: 0;
  }

  .brand strong {
    display: none;
  }
}