* {
  box-sizing: border-box;
}

:root {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: #171717;
  background: #d8d8d8;
  --panel: rgba(255, 255, 255, 0.97);
  --border: #c7c7c7;
  --control-bg: #fff;
  --viewer-bg: #bdbdbd;
  --muted: #666;
}

html,
body {
  height: 100%;
  margin: 0;
}

body {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto;
  overflow: hidden;
}

button,
input {
  min-height: 38px;
  border: 1px solid #aaa;
  border-radius: 8px;
  background: var(--control-bg);
  color: inherit;
  font: inherit;
}

button {
  padding: 6px 12px;
  cursor: pointer;
  white-space: nowrap;
}

button:hover {
  filter: brightness(0.96);
}

button:disabled {
  opacity: 0.4;
  cursor: default;
}

input {
  min-width: 0;
  padding: 7px 10px;
}

.primary {
  font-weight: 600;
}

.icon-button {
  width: 40px;
  padding-inline: 0;
  font-size: 20px;
  line-height: 1;
}

.toolbar {
  display: grid;
  grid-template-columns: minmax(280px, 1fr) auto auto;
  gap: 10px 16px;
  align-items: center;
  padding: 10px 14px;
  padding-top: max(10px, env(safe-area-inset-top));
  border-bottom: 1px solid var(--border);
  background: var(--panel);
  z-index: 10;
}

.search-row,
.page-row,
.zoom-row {
  display: flex;
  align-items: center;
  gap: 7px;
}

.search-row {
  min-width: 0;
}

#codeInput {
  width: 100%;
  text-transform: uppercase;
}

#pageInput {
  width: 78px;
  text-align: center;
}

.page-label,
.page-range,
.zoom-label {
  color: var(--muted);
  white-space: nowrap;
}

.zoom-label {
  min-width: 48px;
  text-align: center;
}

.viewer {
  position: relative;
  min-height: 0;
  overflow: auto;
  padding: 14px;
  text-align: center;
  overscroll-behavior: contain;
  -webkit-overflow-scrolling: touch;
  background: var(--viewer-bg);
}

#pageImage {
  display: none;
  width: auto;
  max-width: none;
  height: auto;
  vertical-align: top;
  background: white;
  box-shadow: 0 3px 16px rgba(0, 0, 0, 0.28);
  user-select: none;
  -webkit-user-drag: none;
}

.status {
  display: inline-block;
  margin-top: 18vh;
  max-width: min(90%, 520px);
  padding: 14px 18px;
  border-radius: 10px;
  background: var(--panel);
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.16);
}

.status[data-error="true"] {
  color: #b42318;
}

.footer {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  min-height: 34px;
  padding: 8px 14px;
  padding-bottom: max(8px, env(safe-area-inset-bottom));
  border-top: 1px solid var(--border);
  background: var(--panel);
  color: var(--muted);
  font-size: 13px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
}

/* 平板 */
@media (max-width: 980px) {
  .toolbar {
    grid-template-columns: 1fr auto;
  }

  .search-row {
    grid-column: 1 / -1;
  }
}

/* 手机 */
@media (max-width: 600px) {
  body {
    grid-template-rows: auto minmax(0, 1fr) auto;
  }

  .toolbar {
    position: sticky;
    top: 0;
    display: grid;
    grid-template-columns: 1fr;
    gap: 8px;
    padding: 8px;
    padding-top: max(8px, env(safe-area-inset-top));
  }

  .search-row,
  .page-row,
  .zoom-row {
    width: 100%;
  }

  .search-row #codeInput {
    flex: 1;
    font-size: 16px; /* 避免 iOS 聚焦时自动放大 */
  }

  .page-row {
    display: grid;
    grid-template-columns: 40px auto minmax(62px, 86px) 1fr auto 40px;
    gap: 6px;
  }

  #pageInput {
    width: 100%;
    font-size: 16px;
  }

  .page-range {
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .zoom-row {
    display: grid;
    grid-template-columns: 40px 50px 40px 1fr auto;
    gap: 6px;
  }

  .viewer {
    padding: 4px;
    background: #8f8f8f;
  }

  #pageImage {
    box-shadow: none;
  }

  .footer {
    display: block;
    min-height: 30px;
    padding: 6px 8px;
    padding-bottom: max(6px, env(safe-area-inset-bottom));
    text-align: center;
  }

  #cacheInfo {
    display: none;
  }
}

/* 极窄屏 */
@media (max-width: 360px) {
  .page-row {
    grid-template-columns: 38px auto minmax(56px, 72px) 1fr 38px;
  }

  #goPageBtn {
    display: none;
  }

  .zoom-row {
    grid-template-columns: 38px 48px 38px 1fr;
  }

  #actualBtn {
    display: none;
  }
}

@media (prefers-color-scheme: dark) {
  :root {
    color: #eee;
    background: #222;
    --panel: rgba(31, 31, 31, 0.98);
    --border: #555;
    --control-bg: #2b2b2b;
    --viewer-bg: #3d3d3d;
    --muted: #bbb;
  }

  .status[data-error="true"] {
    color: #ffb4ab;
  }
}