:root {
  color-scheme: light;
  --bg: #f5f7fb;
  --bg-elev: #ffffff;
  --text: #142033;
  --muted: #5a6b84;
  --border: #d7deea;
  --accent: #2457ff;
  --accent-weak: #e8efff;
  --shadow: 0 10px 30px rgba(19, 35, 62, 0.08);
  --input-bg: #fff;
}

[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0f1420;
  --bg-elev: #171e2c;
  --text: #edf2ff;
  --muted: #9caac2;
  --border: #2a3446;
  --accent: #7c9dff;
  --accent-weak: #1d2944;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.28);
  --input-bg: #121826;
}

* {
  box-sizing: border-box;
}

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

body {
  font-family: Inter, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
}

body.modal-open {
  overflow: hidden;
}

button,
input {
  font: inherit;
}

button {
  border: 1px solid var(--border);
  background: var(--bg-elev);
  color: var(--text);
  border-radius: 10px;
  padding: 0.72rem 1rem;
  cursor: pointer;
}

button:hover {
  border-color: var(--accent);
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.55;
}

.primary {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.icon-button {
  width: 40px;
  height: 40px;
  padding: 0;
  border-radius: 999px;
  display: grid;
  place-items: center;
  font-size: 1.2rem;
  line-height: 1;
}

.announcement-modal {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: grid;
  place-items: center;
  padding: 20px;
}

.announcement-modal[aria-hidden="true"] {
  pointer-events: none;
  opacity: 0;
}

.announcement-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(10, 16, 28, 0.58);
  backdrop-filter: blur(6px);
}

.announcement-dialog {
  position: relative;
  z-index: 1;
  width: min(640px, 100%);
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.24);
  padding: 18px;
}

.announcement-header,
.announcement-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

.announcement-kicker,
.footer-label {
  margin: 0;
  color: var(--accent);
  font-size: 0.9rem;
}

.announcement-dialog h2 {
  margin: 4px 0 0;
  font-size: 1.25rem;
}

.announcement-body {
  margin-top: 14px;
  color: var(--muted);
  line-height: 1.75;
}

.announcement-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 18px;
  margin: 0 0 12px;
}

.announcement-content ol {
  margin: 0;
  padding-left: 1.2rem;
}

.announcement-content li + li {
  margin-top: 8px;
}

.announcement-footer {
  margin-top: 18px;
  justify-content: flex-end;
}

.app-shell {
  width: min(1200px, calc(100% - 32px));
  margin: 0 auto;
  padding: 24px 0 40px;
}

.topbar {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: flex-start;
  margin-bottom: 20px;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--accent);
  font-size: 0.92rem;
}

h1 {
  margin: 0;
  font-size: clamp(1.8rem, 2.5vw, 2.7rem);
}

.lead {
  margin: 10px 0 0;
  max-width: 72ch;
  line-height: 1.7;
  color: var(--muted);
}

.theme-toggle {
  white-space: nowrap;
}

.content {
  display: grid;
  gap: 16px;
}

.site-footer {
  margin-top: 18px;
  padding: 16px 18px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--bg-elev);
  box-shadow: var(--shadow);
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.site-footer strong {
  display: block;
  margin-top: 6px;
  font-size: 1.05rem;
}

.panel {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: var(--shadow);
  padding: 18px;
}

.section-header {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
  margin-bottom: 14px;
}

.section-header h2 {
  margin: 0;
  font-size: 1.1rem;
}

.section-header p {
  margin: 6px 0 0;
  color: var(--muted);
  line-height: 1.6;
}

.toolbar {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.drop-zone {
  border: 1.5px dashed var(--border);
  border-radius: 14px;
  background: linear-gradient(180deg, color-mix(in srgb, var(--accent-weak) 48%, transparent), transparent);
  min-height: 150px;
  display: grid;
  place-items: center;
  text-align: center;
  padding: 24px;
  outline: none;
}

.drop-zone.dragover {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent-weak) 78%, transparent);
}

.drop-zone-copy {
  display: grid;
  gap: 8px;
}

.drop-zone-copy strong {
  font-size: 1.05rem;
}

.drop-zone-copy span,
.label,
.hint,
.download-range,
.preview-range,
.preview-stat {
  color: var(--muted);
}

.source-meta {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-top: 14px;
}

.source-meta > div {
  background: color-mix(in srgb, var(--accent-weak) 50%, transparent);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px;
  min-width: 0;
}

.source-meta strong {
  display: block;
  margin-top: 6px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.layers-head,
.layer-row {
  display: grid;
  grid-template-columns: 1.4fr 0.9fr 0.9fr 1.3fr;
  gap: 10px;
  align-items: center;
}

.layers-head {
  padding: 0 10px 10px;
  color: var(--muted);
  font-size: 0.92rem;
}

.layers-editor {
  display: grid;
  gap: 10px;
}

.layer-row {
  padding: 10px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.02);
}

[data-theme="light"] .layer-row {
  background: #fff;
}

.layer-row input {
  width: 100%;
  min-width: 0;
  background: var(--input-bg);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 10px;
  padding: 0.72rem 0.8rem;
}

.row-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.preview-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 14px;
}

.preview-card {
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  background: var(--bg-elev);
}

.preview-image-wrap {
  aspect-ratio: 1;
  background:
    linear-gradient(45deg, rgba(0, 0, 0, 0.06) 25%, transparent 25%, transparent 75%, rgba(0, 0, 0, 0.06) 75%),
    linear-gradient(45deg, rgba(0, 0, 0, 0.06) 25%, transparent 25%, transparent 75%, rgba(0, 0, 0, 0.06) 75%);
  background-position: 0 0, 16px 16px;
  background-size: 32px 32px;
}

.preview-image {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
}

.preview-meta {
  display: grid;
  gap: 4px;
  padding: 12px;
}

.download-list {
  display: grid;
  gap: 10px;
}

.download-item {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 12px;
}

.empty-state {
  min-height: 110px;
  place-items: center;
}

.empty-message {
  color: var(--muted);
  padding: 20px 0;
  text-align: center;
}

@media (max-width: 900px) {
  .topbar,
  .section-header,
  .download-item {
    flex-direction: column;
    align-items: stretch;
  }

  .source-meta,
  .layers-head,
  .layer-row {
    grid-template-columns: 1fr;
  }

  .layers-head {
    display: none;
  }

  .row-actions,
  .toolbar {
    justify-content: stretch;
  }

  .row-actions button,
  .toolbar button {
    width: 100%;
  }
}