:root {
  color-scheme: light;
  --bg: #f5f5f7;
  --panel: rgba(255, 255, 255, 0.82);
  --surface: #ffffff;
  --text: #1d1d1f;
  --muted: #6e6e73;
  --line: rgba(0, 0, 0, 0.12);
  --accent: #0071e3;
  --accent-dark: #0066cc;
  --accent-soft: rgba(0, 113, 227, 0.12);
  --danger: #ff3b30;
  --comments-width: 340px;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display", "Helvetica Neue", Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  min-height: 100vh;
  margin: 0;
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
}

body.resizing-comments {
  cursor: col-resize;
  user-select: none;
}

button,
input,
textarea {
  font: inherit;
}

button,
.upload-button {
  border: 1px solid transparent;
  border-radius: 999px;
  background: rgba(0, 0, 0, 0.04);
  color: var(--text);
  min-height: 34px;
  padding: 0 16px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0;
  transition: background 160ms ease, color 160ms ease, border-color 160ms ease, transform 120ms ease;
}

button:hover,
.upload-button:hover {
  background: rgba(0, 0, 0, 0.07);
}

button:active,
.upload-button:active {
  transform: scale(0.98);
}

button:disabled,
.upload-button:has(input:disabled) {
  cursor: progress;
  opacity: 0.72;
}

.upload-button.is-loading {
  background: var(--accent-soft);
  color: var(--accent-dark);
}

#copyLinkButton,
#saveButton {
  background: var(--accent);
  color: #ffffff;
}

#copyLinkButton:hover,
#saveButton:hover {
  background: var(--accent-dark);
}

.app-bar {
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 10px 22px;
  background: var(--panel);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--line);
}

.app-bar h1 {
  margin: 0;
  font-size: 17px;
  line-height: 1.2;
  letter-spacing: 0;
  font-weight: 600;
  font-family: "SF Mono", "Roboto Mono", ui-monospace, Menlo, Monaco, Consolas, monospace;
}

.app-bar p {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 12px;
}

.toolbar {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.upload-button input {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
}

.presence {
  display: flex;
  align-items: center;
  min-width: 60px;
  min-height: 36px;
}

.presence-bubble {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  display: inline-grid;
  place-items: center;
  margin-left: -7px;
  border: 2px solid rgba(255, 255, 255, 0.92);
  color: #ffffff;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
}

.presence-bubble:first-child {
  margin-left: 0;
}

.workspace {
  position: relative;
  height: calc(100vh - 64px);
  display: grid;
  grid-template-columns: minmax(0, 1fr) var(--comments-width);
  gap: 0;
}

.workspace.comments-collapsed {
  grid-template-columns: minmax(0, 1fr) 0;
}

.review-surface {
  position: relative;
  min-width: 0;
  min-height: 0;
  background: #f5f5f7;
}

#preview {
  display: block;
  width: 100%;
  height: 100%;
  border: 0;
  background: #ffffff;
  overflow: auto;
}

.empty-state {
  position: absolute;
  inset: 0;
  display: grid;
  place-content: center;
  gap: 8px;
  text-align: center;
  padding: 24px;
  color: var(--muted);
}

.empty-state strong {
  color: var(--text);
  font-size: 21px;
  font-weight: 600;
}

.empty-state[hidden] {
  display: none;
}

.comments-panel {
  position: relative;
  min-width: 0;
  min-height: 0;
  display: flex;
  flex-direction: column;
  background: rgba(245, 245, 247, 0.86);
  backdrop-filter: saturate(180%) blur(24px);
  -webkit-backdrop-filter: saturate(180%) blur(24px);
  border-left: 1px solid var(--line);
  overflow: visible;
}

.workspace.comments-collapsed .comments-panel {
  border-left: 0;
  overflow: hidden;
  visibility: hidden;
}

.panel-resize-handle {
  position: absolute;
  z-index: 3;
  top: 0;
  bottom: 0;
  left: -4px;
  width: 8px;
  cursor: col-resize;
}

.panel-resize-handle::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 3px;
  width: 1px;
  background: transparent;
}

.panel-resize-handle:hover::before,
body.resizing-comments .panel-resize-handle::before {
  background: var(--accent);
}

.panel-header {
  height: 58px;
  padding: 0 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
}

.panel-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.panel-header h2 {
  margin: 0;
  font-size: 17px;
  font-weight: 600;
}

#commentCount {
  color: var(--muted);
  font-size: 13px;
}

.icon-button,
.show-panel-button,
.composer-close {
  width: 32px;
  min-width: 32px;
  height: 32px;
  min-height: 32px;
  padding: 0;
  border-radius: 50%;
  font-size: 21px;
  line-height: 1;
  background: rgba(0, 0, 0, 0.05);
}

.show-panel-button {
  position: absolute;
  z-index: 20;
  top: 12px;
  right: 12px;
  background: #ffffff;
  box-shadow: 0 8px 26px rgb(0 0 0 / 12%);
}

.show-panel-button.hidden {
  display: none;
}

.comments-list {
  overflow: auto;
  padding: 14px;
}

.comment {
  border: 1px solid rgba(0, 0, 0, 0.08);
  border-radius: 18px;
  background: #ffffff;
  padding: 14px;
  margin-bottom: 12px;
  box-shadow: 0 1px 2px rgb(0 0 0 / 4%);
  transition: border-color 160ms ease, box-shadow 160ms ease, transform 160ms ease;
}

.comment:hover,
.comment.active {
  border-color: rgba(0, 113, 227, 0.35);
  box-shadow: 0 8px 26px rgb(0 0 0 / 8%), 0 0 0 4px var(--accent-soft);
  transform: translateY(-1px);
}

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

.comment-text {
  margin: 0;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.comment-reply {
  display: block;
  margin-top: 4px;
  padding-left: 6px;
  border-left: 2px solid rgba(0, 113, 227, 0.22);
  font-size: 13px;
  line-height: 1.25;
  white-space: normal;
}

.comment-reply-meta {
  display: block;
  margin-bottom: 0;
  color: var(--muted);
  font-size: 11px;
  line-height: 1.25;
}

.composer {
  position: fixed;
  z-index: 50;
  width: min(360px, calc(100vw - 24px));
  padding: 18px 14px 12px;
  border: 1px solid rgba(255, 255, 255, 0.36);
  border-radius: 24px;
  background: rgba(28, 28, 30, 0.92);
  backdrop-filter: saturate(180%) blur(24px);
  -webkit-backdrop-filter: saturate(180%) blur(24px);
  box-shadow: 0 20px 60px rgb(0 0 0 / 28%);
}

.composer::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 10px;
  width: 30px;
  height: 30px;
  border-radius: 17px 17px 17px 4px;
  background: var(--accent);
  box-shadow: 0 10px 24px rgb(0 0 0 / 18%);
}

.composer.hidden {
  display: none;
}

.composer-close {
  position: absolute;
  top: -12px;
  right: -12px;
  border: 0;
  background: rgba(58, 58, 60, 0.96);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.18);
  box-shadow: 0 6px 18px rgb(0 0 0 / 26%);
}

.composer-close:hover {
  background: rgba(72, 72, 74, 1);
}

.composer input,
.composer textarea {
  width: 100%;
  border: 0;
  border-radius: 18px;
  padding: 12px 14px;
  background: rgba(255, 255, 255, 0.12);
  color: #ffffff;
  resize: none;
  line-height: 20px;
  overflow: hidden;
}

.composer input::placeholder,
.composer textarea::placeholder {
  color: #a3a3a3;
}

.composer input {
  margin-right: 32px;
  width: calc(100% - 36px);
}

.composer textarea {
  margin-top: 8px;
  min-height: 44px;
  max-height: 140px;
  padding-right: 54px;
}

.composer input:focus,
.composer textarea:focus {
  outline: 3px solid rgba(0, 113, 227, 0.32);
}

.composer-actions {
  position: absolute;
  right: 22px;
  bottom: 22px;
  display: flex;
  z-index: 2;
}

#submitCommentButton {
  background: rgba(255, 255, 255, 0.28);
  border: 0;
  border-radius: 50%;
  width: 34px;
  min-width: 34px;
  height: 34px;
  min-height: 34px;
  padding: 0;
  color: #ffffff;
  font: 600 20px/1 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", sans-serif;
  box-shadow: 0 6px 18px rgb(0 0 0 / 26%);
  text-shadow: 0 1px 2px rgb(0 0 0 / 22%);
}

#submitCommentButton:hover {
  background: rgba(255, 255, 255, 0.36);
}

.copy-toast {
  position: fixed;
  z-index: 80;
  top: 14px;
  left: 50%;
  transform: translateX(-50%) translateY(-8px);
  border: 1px solid rgba(0, 0, 0, 0.08);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.88);
  color: var(--text);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  padding: 9px 16px;
  font-size: 13px;
  font-weight: 600;
  opacity: 0;
  pointer-events: none;
  box-shadow: 0 10px 34px rgb(0 0 0 / 12%);
  transition: opacity 180ms ease, transform 180ms ease;
}

.copy-toast.visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.help-button {
  position: fixed;
  z-index: 70;
  right: 18px;
  bottom: 18px;
  width: 42px;
  min-width: 42px;
  height: 42px;
  min-height: 42px;
  padding: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.9);
  color: var(--text);
  box-shadow: 0 10px 34px rgb(0 0 0 / 14%);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  font-size: 18px;
  font-weight: 700;
}

.help-panel {
  position: fixed;
  z-index: 75;
  right: 18px;
  bottom: 70px;
  width: min(360px, calc(100vw - 36px));
  max-height: min(560px, calc(100vh - 100px));
  overflow: auto;
  border: 1px solid rgba(0, 0, 0, 0.08);
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.92);
  box-shadow: 0 22px 64px rgb(0 0 0 / 18%);
  backdrop-filter: saturate(180%) blur(24px);
  -webkit-backdrop-filter: saturate(180%) blur(24px);
  padding: 16px;
}

.help-panel.hidden {
  display: none;
}

.help-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}

.help-header h2 {
  margin: 0;
  font-size: 18px;
  font-weight: 600;
}

.help-panel dl {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 10px 14px;
  margin: 0;
  font-size: 13px;
}

.help-panel dt {
  color: var(--text);
  font-family: "SF Mono", "Roboto Mono", ui-monospace, Menlo, Monaco, Consolas, monospace;
  font-weight: 600;
}

.help-panel dd {
  margin: 0;
  color: var(--muted);
}

.help-credit {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 11px;
  line-height: 1.3;
}

.help-credit a {
  color: inherit;
  text-decoration: underline;
  text-underline-offset: 2px;
}

@media (max-width: 900px) {
  .app-bar {
    height: auto;
    align-items: flex-start;
    flex-direction: column;
  }

  .toolbar {
    width: 100%;
    flex-wrap: wrap;
  }

  .workspace {
    height: calc(100vh - 118px);
    grid-template-columns: 1fr;
    grid-template-rows: minmax(0, 1fr) 280px;
  }

  .workspace.comments-collapsed {
    grid-template-columns: 1fr;
    grid-template-rows: minmax(0, 1fr) 0;
  }

  .comments-panel {
    border-left: 0;
    border-top: 1px solid var(--line);
  }

  .panel-resize-handle {
    display: none;
  }
}