:root {
  color-scheme: dark;
  --bg: #151515;
  --panel: #121212;
  --panel-2: #0b0b0b;
  --border: rgba(255, 255, 255, 0.14);
  --text: rgba(255, 255, 255, 0.92);
  --muted: rgba(255, 255, 255, 0.58);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", sans-serif;
}

.layout {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.topbar {
  height: 48px;
  border-bottom: 1px solid var(--border);
  background: var(--panel-2);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 0 14px;
}

.design-title {
  margin: 0;
  font-size: 14px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.topbar-controls {
  display: flex;
  align-items: center;
  gap: 12px;
}

.range-group {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 11px;
  color: var(--muted);
  padding: 4px 8px;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.08);
}

.range-group input {
  width: 120px;
}

.control-btn {
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
  border-radius: 8px;
  padding: 4px 10px;
  font-size: 11px;
  cursor: pointer;
}

.control-btn:hover {
  background: rgba(255, 255, 255, 0.12);
}

.image-position {
  font-size: 12px;
  color: var(--muted);
}

.content {
  flex: 1;
  min-height: 0;
  display: flex;
}

.sidebar {
  width: 230px;
  min-width: 230px;
  border-right: 1px solid var(--border);
  background: var(--panel);
  overflow-y: auto;
  padding: 8px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.pdf-toolbar {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 10px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.06);
}

.pdf-toolbar-title {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.pdf-width-group {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  font-size: 11px;
  color: var(--muted);
}

.pdf-width-group input {
  width: 96px;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px 8px;
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
}

.pdf-btn {
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.08);
  color: var(--text);
  border-radius: 8px;
  padding: 7px 10px;
  font-size: 11px;
  cursor: pointer;
}

.pdf-btn:hover {
  background: rgba(255, 255, 255, 0.14);
}

.thumb-btn {
  border: 0;
  padding: 6px;
  border-radius: 10px;
  background: transparent;
  color: inherit;
  text-align: left;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.thumb-btn:hover {
  background: rgba(255, 255, 255, 0.08);
}

.thumb-btn.active {
  background: rgba(255, 255, 255, 0.14);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.3);
}

.thumb-btn.active .thumb-preview img {
  filter: brightness(1.12) saturate(1.05);
}

.thumb-btn.active .thumb-label {
  color: var(--text);
  font-weight: 500;
}

.thumb-preview {
  width: 100%;
  aspect-ratio: 4 / 3;
  border-radius: 8px;
  overflow: hidden;
  background: rgba(0, 0, 0, 0.3);
}

.thumb-preview img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.thumb-label {
  display: block;
  margin-top: 0;
  font-size: 11px;
  line-height: 1.35;
  color: var(--muted);
  white-space: normal;
  word-break: break-word;
  overflow: hidden;
}

.preview-main {
    width: auto;
    height: auto;
    overflow: auto;
    margin-inline: auto;
    padding: 50px;
}

.main-image {
  width: auto;
  height: auto;
  border-radius: 0px;
  box-shadow: 0 28px 48px rgba(0, 0, 0, 0.45);
  display: none;
}

.empty-state {
  margin-top: 120px;
  color: rgba(255, 255, 255, 0.34);
  font-size: 14px;
}

.floating-controls {
  position: fixed;
  right: 16px;
  bottom: 16px;
  z-index: 30;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 10px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: rgba(11, 11, 11, 0.82);
  backdrop-filter: blur(8px);
}

.floating-btn {
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.08);
  color: var(--text);
  border-radius: 8px;
  padding: 6px 10px;
  font-size: 11px;
  cursor: pointer;
  min-width: 128px;
  text-align: left;
}

.floating-btn:hover {
  background: rgba(255, 255, 255, 0.14);
}

.floating-hint {
  font-size: 10px;
  color: var(--muted);
  letter-spacing: 0.02em;
}

.topbar-hidden .preview-main {
  padding-top: 0;
  padding-bottom: 0;
}

@media (max-width: 880px) {
  .content {
    flex-direction: column;
  }

  .sidebar {
    width: 100%;
    border-right: 0;
    border-bottom: 1px solid var(--border);
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
  }

  .thumb-label {
    font-size: 10px;
  }

  .floating-controls {
    right: 10px;
    bottom: 10px;
  }
}