export const EXPORT_HTML_STYLES = `:root {
  color-scheme: light;
  --bg: #f6f7fb;
  --card: #ffffff;
  --text: #1f2a37;
  --muted: #6b7280;
  --accent: #4f46e5;
  --sent: #dbeafe;
  --received: #ffffff;
  --border: #e5e7eb;
  --shadow: 0 12px 30px rgba(15, 23, 42, 0.08);
  --radius: 16px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.page {
  max-width: 1080px;
  margin: 0 auto;
  padding: 8px 20px;
  height: 100vh;
  display: flex;
  flex-direction: column;
}

.header {
  background: var(--card);
  border-radius: 12px;
  box-shadow: 0 2px 8px rgba(15, 23, 42, 0.06);
  padding: 12px 20px;
  flex-shrink: 0;
}

.title {
  font-size: 16px;
  font-weight: 600;
  margin: 0;
  display: inline;
}

.meta {
  color: var(--muted);
  font-size: 13px;
  display: inline;
  margin-left: 12px;
}

.meta span {
  margin-right: 10px;
}

.controls {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 8px;
  flex-wrap: wrap;
}

.controls input,
.controls button {
  border-radius: 8px;
  border: 1px solid var(--border);
  padding: 6px 10px;
  font-size: 13px;
  font-family: inherit;
}

.controls input[type="search"] {
  width: 200px;
}

.controls input[type="datetime-local"] {
  width: 200px;
}

.controls button {
  background: var(--accent);
  color: #fff;
  border: none;
  cursor: pointer;
  padding: 6px 14px;
}

.controls button:active {
  transform: scale(0.98);
}

.stats {
  font-size: 13px;
  color: var(--muted);
  margin-left: auto;
}

.message-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 4px 0;
}

.message {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.message.hidden {
  display: none;
}

.message-time {
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 6px;
}

.message-row {
  display: flex;
  gap: 12px;
  align-items: flex-end;
}

.message.sent .message-row {
  flex-direction: row-reverse;
}

.avatar {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  background: #eef2ff;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  flex-shrink: 0;
  color: #475569;
  font-weight: 600;
}

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

.bubble {
  max-width: min(70%, 720px);
  background: var(--received);
  border-radius: 18px;
  padding: 12px 14px;
  border: 1px solid var(--border);
  box-shadow: 0 8px 20px rgba(15, 23, 42, 0.06);
}

.message.sent .bubble {
  background: var(--sent);
  border-color: transparent;
}

.sender-name {
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 6px;
}

.message-content {
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 14px;
  line-height: 1.6;
}

.message-text {
  word-break: break-word;
}

.inline-emoji {
  width: 22px;
  height: 22px;
  vertical-align: text-bottom;
  margin: 0 2px;
}

.message-media {
  border-radius: 14px;
  max-width: 100%;
}

.previewable {
  cursor: zoom-in;
}

.message-media.image,
.message-media.emoji {
  max-height: 260px;
  object-fit: contain;
  background: #f1f5f9;
  padding: 6px;
}

.message-media.emoji {
  max-height: 160px;
  width: auto;
}

.message-media.video {
  max-height: 360px;
  background: #111827;
}

.message-media.audio {
  width: 260px;
}

.image-preview {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
  z-index: 999;
}

.image-preview.active {
  opacity: 1;
  pointer-events: auto;
}

.image-preview img {
  max-width: min(90vw, 1200px);
  max-height: 90vh;
  border-radius: 18px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.35);
  background: #0f172a;
  transition: transform 0.1s ease;
  cursor: zoom-out;
}

.highlight {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
  border-radius: 18px;
  transition: outline-color 0.3s;
}

.empty {
  text-align: center;
  color: var(--muted);
  padding: 40px;
}

/* Scroll Container */
.scroll-container {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  margin-top: 8px;
  margin-bottom: 8px;
  padding: 12px;
  -webkit-overflow-scrolling: touch;
}

.scroll-container::-webkit-scrollbar {
  width: 6px;
}

.scroll-container::-webkit-scrollbar-thumb {
  background: #c1c1c1;
  border-radius: 3px;
}

.load-sentinel {
  height: 1px;
}
`;