:root {
  --bg: #f4f6f8;
  --bg-top: #dbe9f2;
  --panel: #ffffff;
  --text: #1d2935;
  --muted: #5b6875;
  --border: #d4dce3;
  --accent: #0f5d8c;
  --accent-2: #d67f00;
  --danger: #a40000;
  --help-bg: #eef6fb;
  --help-panel: #ffffff;
  --viewer-bg: #f7f8fa;
  --viewer-btn: #2f3d4a;
  --item-bg: #fbfdff;
  --textarea-bg: #f9fbfc;
  --howto-text: #2f3b48;
  --upload-bg: #f8fbfe;
  --upload-border: #c9d8e6;
  --upload-btn-bg: #1d79b3;
  --upload-btn-text: #ffffff;
}

* {
  box-sizing: border-box;
}

[data-theme="dark"] {
  --bg: #0f1419;
  --bg-top: #1a2430;
  --panel: #19212b;
  --text: #e7edf3;
  --muted: #a8b8c9;
  --border: #304152;
  --accent: #4ca6dd;
  --accent-2: #d59a42;
  --danger: #ffb8b8;
  --help-bg: #1e3040;
  --help-panel: #1b2631;
  --viewer-bg: #111a22;
  --viewer-btn: #3d4f60;
  --item-bg: #1a2430;
  --textarea-bg: #121a22;
  --howto-text: #d5e0eb;
  --upload-bg: #152230;
  --upload-border: #35526a;
  --upload-btn-bg: #368ec5;
  --upload-btn-text: #0b141c;
}

body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  color: var(--text);
  background: radial-gradient(circle at top right, var(--bg-top), var(--bg) 45%);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem;
}

.page-header {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: flex-start;
  margin-bottom: 0.4rem;
}

h1 {
  margin-bottom: 0.25rem;
}

.subtitle {
  margin-top: 0;
  color: var(--muted);
}

.theme-switcher {
  min-width: 145px;
}

.theme-switcher label {
  margin-bottom: 0.25rem;
  color: var(--muted);
  font-weight: 600;
}

.theme-switcher select {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.45rem 0.5rem;
  background: var(--panel);
  color: var(--text);
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1rem;
}

.controls {
  margin-bottom: 1rem;
}

.field {
  margin-bottom: 0.85rem;
}

.upload-field {
  padding: 0.75rem;
  border: 1px solid var(--upload-border);
  border-radius: 12px;
  background: linear-gradient(180deg, var(--upload-bg), transparent 120%);
}

.field-hint {
  margin: 0.35rem 0 0;
  color: var(--muted);
  font-size: 0.86rem;
}

.mobile-only {
  display: none;
}

label {
  display: block;
  margin-bottom: 0.35rem;
  font-weight: 600;
}

.label-with-help {
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

.help-dot {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.15rem;
  height: 1.15rem;
  border-radius: 999px;
  border: 1px solid var(--accent);
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 700;
  line-height: 1;
  cursor: help;
  background: var(--help-bg);
}

.help-box {
  position: absolute;
  left: 1.5rem;
  top: -0.4rem;
  width: min(320px, 80vw);
  padding: 0.55rem 0.65rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--help-panel);
  color: var(--text);
  font-size: 0.84rem;
  font-weight: 500;
  line-height: 1.35;
  box-shadow: 0 8px 20px rgba(22, 32, 45, 0.14);
  opacity: 0;
  visibility: hidden;
  transform: translateY(2px);
  transition: opacity 120ms ease, transform 120ms ease, visibility 120ms ease;
  z-index: 10;
}

.help-dot:hover .help-box,
.help-dot:focus .help-box,
.help-dot:focus-visible .help-box {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

input[type="file"],
input[type="range"],
select,
button {
  width: 100%;
}

input[type="file"] {
  border: 1px dashed var(--upload-border);
  border-radius: 10px;
  padding: 0.55rem 0.6rem;
  background: rgba(255, 255, 255, 0.02);
  color: var(--text);
}

input[type="file"]::file-selector-button {
  border: none;
  border-radius: 8px;
  padding: 0.5rem 0.75rem;
  margin-right: 0.7rem;
  font-weight: 700;
  cursor: pointer;
  background: var(--upload-btn-bg);
  color: var(--upload-btn-text);
  transition: transform 120ms ease, filter 120ms ease;
}

input[type="file"]::file-selector-button:hover {
  filter: brightness(1.08);
}

input[type="file"]::file-selector-button:active {
  transform: translateY(1px);
}

.camera-field input[type="file"]::file-selector-button {
  background: var(--accent-2);
  color: #fff;
}

.file-trigger-row {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  border: 1px dashed var(--upload-border);
  border-radius: 10px;
  padding: 0.5rem 0.55rem;
}

.file-trigger {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 38px;
  padding: 0.45rem 0.8rem;
  border-radius: 8px;
  font-weight: 700;
  cursor: pointer;
  text-decoration: none;
}

.camera-trigger {
  background: var(--accent-2);
  color: #fff;
}

.file-name {
  color: var(--text);
  font-weight: 500;
  font-size: 0.98rem;
}

.visually-hidden-file {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  border: 0;
  clip: rect(0, 0, 0, 0);
  overflow: hidden;
  white-space: nowrap;
}

.row {
  display: grid;
  grid-template-columns: 1fr 220px;
  gap: 0.75rem;
  align-items: end;
}

.checkbox {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0;
}

.checkbox input {
  width: auto;
}

.actions {
  margin-top: 0.9rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

button {
  border: none;
  border-radius: 8px;
  padding: 0.7rem 0.9rem;
  font-weight: 700;
  cursor: pointer;
  background: var(--accent);
  color: white;
  transition: filter 140ms ease, transform 120ms ease;
}

button[type="button"] {
  background: var(--accent-2);
}

button:hover {
  filter: brightness(1.06);
}

button:active {
  transform: translateY(1px);
}

.preview-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.preview h2 {
  margin-top: 0;
}

.preview img:not(.viewer-image) {
  width: 100%;
  object-fit: contain;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--viewer-bg);
}

.zoom-frame {
  overflow: hidden;
  height: clamp(380px, 62vh, 760px);
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--viewer-bg);
  position: relative;
  cursor: grab;
  touch-action: none;
}

.preview-image {
  display: block;
  width: auto !important;
  height: auto !important;
  max-width: none;
  max-height: none;
  border: 0;
  border-radius: 0;
  position: absolute;
  top: 0;
  left: 0;
  user-select: none;
  -webkit-user-drag: none;
  touch-action: none;
}

.placeholder {
  color: var(--muted);
  margin: 1.2rem 0;
}

.hidden {
  display: none;
}

.attribution {
  margin: 0.6rem 0 0;
  color: var(--muted);
  font-size: 0.9rem;
  font-style: italic;
}

.howto {
  margin-top: 1rem;
}

.howto h2 {
  margin-top: 0;
}

.howto p {
  color: var(--howto-text);
}

.howto ol {
  margin: 0.8rem 0 0;
  padding-left: 1.15rem;
}

.howto li {
  margin-bottom: 0.4rem;
}

.download {
  display: inline-block;
  margin-top: 0.8rem;
  color: var(--accent);
  font-weight: 700;
  text-decoration: none;
}

.metadata-links {
  display: flex;
  flex-direction: column;
}

.batch-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 0.75rem;
}

.batch-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
  margin-bottom: 0.8rem;
}

.batch-header h2 {
  margin: 0;
}

.batch-download-btn {
  width: auto;
  padding: 0.55rem 0.8rem;
}

.batch-item {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.7rem;
  background: var(--item-bg);
}

.batch-item p {
  margin-top: 0;
  margin-bottom: 0.5rem;
  word-break: break-word;
}

.batch-count {
  color: var(--muted);
  margin: 0.6rem 0 0;
}

.viewer {
  margin-top: 0.3rem;
}

.batch-viewer .viewer-toolbar {
  margin-bottom: 0.4rem;
}

.batch-viewer .viewer-btn {
  padding: 0.3rem 0.5rem;
}

.batch-frame {
  height: clamp(220px, 36vh, 340px);
}

.viewer-toolbar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.viewer-btn {
  width: auto;
  min-width: 2.2rem;
  padding: 0.35rem 0.55rem;
  border-radius: 6px;
  background: var(--viewer-btn);
  color: #fff;
}

.viewer-zoom {
  color: var(--muted);
  font-weight: 700;
  margin-left: auto;
}

.viewer-viewport.dragging {
  cursor: grabbing;
}

.metadata-block {
  margin-top: 1rem;
}

.metadata-block label {
  margin-bottom: 0.4rem;
}

.metadata-block textarea {
  width: 100%;
  min-height: 210px;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.6rem;
  font-family: "Consolas", "Menlo", "Monaco", monospace;
  font-size: 0.82rem;
  line-height: 1.35;
  resize: vertical;
  background: var(--textarea-bg);
  color: var(--text);
}

.metadata-block button {
  margin-top: 0.55rem;
}

.alerts {
  margin-bottom: 1rem;
}

.alert {
  border-radius: 8px;
  padding: 0.65rem 0.8rem;
  border: 1px solid #eed9d9;
  background: #fff6f6;
  color: var(--danger);
  margin-bottom: 0.5rem;
}

@media (max-width: 900px) {
  .page-header {
    flex-direction: column;
    align-items: stretch;
  }

  .theme-switcher {
    max-width: 220px;
  }

  .preview-grid {
    grid-template-columns: 1fr;
  }

  .batch-header {
    flex-direction: column;
    align-items: flex-start;
  }

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

  .controls {
    padding: 0.9rem;
  }

  .field {
    margin-bottom: 1rem;
  }

  .mobile-only {
    display: block;
  }

  input[type="file"],
  select,
  button {
    min-height: 44px;
    font-size: 1rem;
  }

  .upload-field {
    padding: 0.7rem;
    border-radius: 10px;
  }

  .field-hint {
    font-size: 0.82rem;
    line-height: 1.35;
  }

  .actions {
    grid-template-columns: 1fr;
  }

  .viewer-btn {
    min-width: 2.5rem;
    min-height: 2.2rem;
  }

  .zoom-frame {
    height: clamp(280px, 52vh, 520px);
    min-height: 280px;
  }

  .batch-frame {
    height: clamp(220px, 42vh, 360px);
  }

  .batch-list {
    grid-template-columns: 1fr;
  }

  .help-box {
    left: 0;
    top: 1.4rem;
    width: min(340px, 92vw);
  }
}