:root {
  --bg: #0f1115;
  --panel: #171a21;
  --border: #262b36;
  --text: #e6e8ec;
  --muted: #9aa3b2;
  --accent: #6366f1;
}

* {
  box-sizing: border-box;
}

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

body {
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
}

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

.topbar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 16px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
}

.brand {
  font-weight: 700;
  letter-spacing: -0.02em;
}

.tag {
  font-size: 12px;
  color: var(--muted);
  border: 1px solid var(--border);
  padding: 2px 8px;
  border-radius: 999px;
}

.spacer {
  flex: 1;
}

.slidecount {
  font-size: 13px;
  color: var(--muted);
}

.main {
  flex: 1;
  display: grid;
  grid-template-columns: 1fr 230px 1.2fr;
  min-height: 0;
}

.pane {
  min-height: 0;
  min-width: 0;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.editor-pane {
  border-right: 1px solid var(--border);
}

.editor {
  flex: 1;
  min-height: 0;
  overflow: auto;
}

.editor .cm-editor {
  height: 100%;
}

.editor .cm-scroller {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 13px;
}

.thumbs {
  overflow-y: auto;
  overflow-x: hidden;
  background: #0b0d11;
  border-right: 1px solid var(--border);
}

.preview-pane {
  background: #0b0d11;
}

.stage {
  flex: 1;
  min-height: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  overflow: hidden;
}

.stage-host {
  background: #fff;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
  overflow: hidden;
}

.connecting {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
}
.spinner {
  width: 34px;
  height: 34px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  padding: 10px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 13px;
}

.nav button {
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  width: 34px;
  height: 30px;
  font-size: 16px;
  cursor: pointer;
}

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

/* --- presence / connection (M2) --- */
.conn {
  font-size: 11px;
  letter-spacing: 0.02em;
}
.conn-connected {
  color: #22c55e;
}
.conn-connecting {
  color: #eab308;
}
.conn-disconnected {
  color: #ef4444;
}

.presence {
  display: flex;
  gap: 4px;
  margin-right: 6px;
}
.avatar {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 700;
  color: #fff;
  text-transform: uppercase;
  border: 1px solid rgba(255, 255, 255, 0.25);
  object-fit: cover;
}
img.avatar {
  border-width: 2px;
  border-style: solid;
}

.logout {
  font-size: 12px;
  color: var(--muted);
  text-decoration: none;
  border: 1px solid var(--border);
  padding: 3px 8px;
  border-radius: 7px;
}
.logout:hover {
  color: var(--text);
}

/* --- splash / login (M4) --- */
.splash {
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  text-align: center;
  padding: 24px;
}
.brand-lg {
  font-size: 34px;
  font-weight: 800;
  letter-spacing: -0.03em;
}
.muted {
  color: var(--muted);
}
.hf-btn {
  margin-top: 8px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: #ffd21e;
  color: #1a1a1a;
  font-weight: 700;
  text-decoration: none;
  padding: 11px 18px;
  border-radius: 10px;
  font-size: 15px;
}
.hf-btn:hover {
  filter: brightness(0.96);
}

/* --- toolbar buttons / export (M5) --- */
.tool-btn {
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 4px 10px;
  font-size: 12px;
  cursor: pointer;
}
.tool-btn:hover:not(:disabled) {
  border-color: var(--accent);
}
.tool-btn:disabled {
  opacity: 0.4;
  cursor: default;
}
.tool-btn.on {
  border-color: var(--accent);
  color: #fff;
}
.export-menu {
  position: relative;
}
.export-pop {
  position: absolute;
  top: 110%;
  left: 0;
  z-index: 20;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 4px;
  display: flex;
  flex-direction: column;
  min-width: 96px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
}
.export-pop button {
  background: none;
  border: none;
  color: var(--text);
  text-align: left;
  padding: 7px 10px;
  border-radius: 6px;
  font-size: 13px;
  cursor: pointer;
}
.export-pop button:hover,
.export-pop a:hover {
  background: rgba(255, 255, 255, 0.06);
}
.export-pop a {
  color: var(--text);
  text-decoration: none;
  padding: 7px 10px;
  border-radius: 6px;
  font-size: 13px;
}

/* identity / guest / sign-in */
.identity {
  display: flex;
  align-items: center;
  gap: 8px;
}
.identity .who {
  font-size: 12px;
  max-width: 120px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.guest-badge {
  font-size: 11px;
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 2px 8px;
}
.login-buttons {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 8px;
}

.brand {
  text-decoration: none;
  color: var(--text);
}
.deck-name {
  font-size: 13px;
  color: var(--muted);
  max-width: 220px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  border-left: 1px solid var(--border);
  padding-left: 10px;
}

/* home / dashboard */
.home-body {
  flex: 1;
  overflow-y: auto;
  max-width: 760px;
  width: 100%;
  margin: 0 auto;
  padding: 40px 24px;
}
.home-title {
  font-size: 24px;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin: 0 0 18px;
}
.home-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 22px;
}
.deck-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.deck-list a {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 16px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  text-decoration: none;
  color: var(--text);
}
.deck-list a:hover {
  border-color: var(--accent);
}
.deck-title {
  font-weight: 600;
}
.deck-id {
  font-size: 12px;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}

/* --- comment highlights in the editor --- */
.cm-comment {
  background: rgba(250, 204, 21, 0.26);
  border-bottom: 2px solid #facc15;
}
.cm-comment-resolved {
  background: rgba(148, 163, 184, 0.16);
}

/* --- comments panel --- */
.comments {
  border-left: 1px solid var(--border);
  background: var(--panel);
  display: flex;
  flex-direction: column;
  min-height: 0;
}
.comments-head {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
}
.icon-btn {
  background: none;
  border: none;
  color: var(--muted);
  cursor: pointer;
  font-size: 14px;
}
.comments-body {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  padding: 10px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.comments-empty {
  font-size: 13px;
  line-height: 1.5;
}
.thread-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px;
  font-size: 13px;
}
.thread-card.active {
  border-color: var(--accent);
}
.thread-card.resolved {
  opacity: 0.7;
}
.thread-card.composing {
  border-color: var(--accent);
}
.quote {
  font-style: italic;
  color: var(--muted);
  border-left: 3px solid #facc15;
  padding-left: 8px;
  margin-bottom: 8px;
  cursor: pointer;
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
}
.reply {
  margin-bottom: 8px;
}
.reply-meta {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 2px;
}
.reply-meta .dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  display: inline-block;
}
.reply-meta .author {
  font-weight: 600;
}
.reply-meta .muted {
  font-size: 11px;
}
.reply-text {
  white-space: pre-wrap;
  word-break: break-word;
}
.reply-compose {
  margin: 6px 0;
}
.reply-input {
  width: 100%;
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 7px;
  padding: 7px 9px;
  font: inherit;
  font-size: 13px;
  resize: vertical;
  box-sizing: border-box;
}
.reply-input.one-line {
  resize: none;
}
textarea.reply-input {
  min-height: 54px;
}
.thread-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 4px;
}
.btn-primary {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 7px;
  padding: 6px 12px;
  font-size: 12px;
  cursor: pointer;
}
.btn-primary:disabled {
  opacity: 0.5;
  cursor: default;
}
.btn-ghost {
  background: none;
  border: 1px solid var(--border);
  color: var(--muted);
  border-radius: 7px;
  padding: 5px 10px;
  font-size: 12px;
  cursor: pointer;
}
.btn-ghost:hover {
  color: var(--text);
}
.btn-ghost.danger:hover {
  color: #ef4444;
  border-color: #ef4444;
}
.you-tag {
  font-size: 11px;
}
.resolved-group summary {
  cursor: pointer;
  color: var(--muted);
  font-size: 12px;
  padding: 4px 0;
}
.resolved-group {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

/* remote cursors from y-codemirror.next */
.cm-ySelectionCaret {
  position: relative;
  border-left: 2px solid;
  margin-left: -1px;
  box-sizing: border-box;
}
.cm-ySelectionInfo {
  position: absolute;
  top: -1.4em;
  left: -2px;
  font-size: 10px;
  font-weight: 600;
  line-height: 1;
  padding: 2px 4px;
  border-radius: 3px 3px 3px 0;
  color: #fff;
  white-space: nowrap;
  opacity: 0;
  transition: opacity 0.2s;
  user-select: none;
}
.cm-ySelectionCaret:hover .cm-ySelectionInfo {
  opacity: 1;
}