/* webapp.css — the web version's own chrome (ARCHITECTURE §15): header toolbar, the
   Edit/Split/Read workspace (editor pane, draggable divider, split ratio), drop overlay,
   toast and missing-image placeholders. The reader itself (layout, TOC, content, code,
   alerts) is the desktop CSS, unchanged. Only tokens from tokens.css. */

:root {
  --mdr-web-header-h: 56px;
  --mdr-web-control-h: 34px;
  --mdr-web-brand-a: #2F81F7;
  --mdr-web-brand-b: #8250DF;
}

:root[data-theme="light"] {
  --mdr-web-page: #F3F5F8;
  --mdr-web-card: #FFFFFF;
  --mdr-web-header-bg: rgba(255, 255, 255, 0.88);
  --mdr-web-segment-bg: #EEF1F4;
  --mdr-web-segment-on: #FFFFFF;
  --mdr-web-input-bg: #FFFFFF;
  --mdr-web-toast-bg: #1F2328;
  --mdr-web-toast-fg: #FFFFFF;
}

:root[data-theme="dark"] {
  --mdr-web-page: #010409;
  --mdr-web-card: #0D1117;
  --mdr-web-header-bg: rgba(13, 17, 23, 0.9);
  --mdr-web-segment-bg: #151B23;
  --mdr-web-segment-on: #2A313C;
  --mdr-web-input-bg: #0D1117;
  --mdr-web-toast-bg: #E6EDF3;
  --mdr-web-toast-fg: #0D1117;
}

/* ---------- Views: Edit / Split / Read ---------- */

html[data-mode="edit"] .mdr-web-reader,
html[data-mode="edit"] #mdr-web-divider,
html[data-mode="edit"] .mdr-web-needs-preview {
  display: none;
}

html[data-mode="read"] #mdr-web-paste,
html[data-mode="read"] #mdr-web-divider {
  display: none;
}

.mdr-web-workspace {
  flex: 1 1 auto;
  min-height: 0;
  display: flex;
  overflow: hidden;
}

.mdr-web-reader {
  display: flex;
  flex-direction: column;
  flex: 1 1 auto;
  min-width: 0;
  min-height: 0;
  overflow: hidden;
}

.mdr-web-reader .mdr-layout {
  min-width: 0;
}

/* ---------- Split mode: editor pane fills its share, divider between panes ---------- */

html[data-mode="split"] #mdr-web-paste {
  flex: 0 0 clamp(240px, var(--mdr-split-ratio, 45%), 80%);
  min-width: 240px;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  overflow: hidden;
  background: var(--mdr-web-card);
}

html[data-mode="split"] .mdr-web-paste-inner {
  flex: 1 1 auto;
  min-height: 0;
  width: 100%;
  max-width: none;
  margin: 0;
  padding: var(--mdr-space-3);
  gap: var(--mdr-space-2);
}

html[data-mode="split"] .mdr-web-editor {
  flex: 1 1 auto;
  min-height: 0;
}

html[data-mode="split"] .mdr-web-input {
  flex: 1 1 auto;
  min-height: 0;
  height: 100%;
  resize: none;
}

html[data-mode="split"] .mdr-web-privacy {
  display: none;
}

.mdr-web-divider {
  display: none;
  flex: none;
  width: 6px;
  background: var(--mdr-border);
  cursor: col-resize;
  touch-action: none;
}

html[data-mode="split"] .mdr-web-divider {
  display: block;
}

.mdr-web-divider:hover,
.mdr-web-divider:focus-visible {
  background: var(--mdr-accent);
  outline: none;
}

@media (max-width: 760px) {
  html[data-mode="split"] .mdr-web-workspace {
    flex-direction: column;
  }

  html[data-mode="split"] #mdr-web-paste {
    flex: 0 0 42vh;
    min-width: 0;
    max-width: none;
  }

  html[data-mode="split"] .mdr-web-reader {
    flex: 1 1 auto;
    min-height: 0;
    border-top: 1px solid var(--mdr-border);
  }

  html[data-mode="split"] .mdr-web-divider {
    display: none;
  }
}

/* ---------- Icons ---------- */

.mdr-web-icon {
  flex: none;
  width: 16px;
  height: 16px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* ---------- Header ---------- */

.mdr-web-header {
  position: relative;
  z-index: 30;
  flex: none;
  display: flex;
  align-items: center;
  gap: var(--mdr-space-3);
  height: var(--mdr-web-header-h);
  padding: 0 var(--mdr-space-4);
  border-bottom: 1px solid var(--mdr-border);
  background: var(--mdr-web-header-bg);
  backdrop-filter: saturate(180%) blur(12px);
}

.mdr-web-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 4px 8px 4px 4px;
  border: none;
  border-radius: var(--mdr-radius-md);
  background: transparent;
  cursor: pointer;
  font-size: 1.0625rem;
  font-weight: 650;
  letter-spacing: -0.01em;
  color: var(--mdr-fg);
}

.mdr-web-brand:hover {
  background: var(--mdr-bg-subtle);
}

.mdr-web-logo {
  width: 28px;
  height: 28px;
  flex: none;
  filter: drop-shadow(0 1px 2px rgba(47, 129, 247, 0.35));
}

.mdr-web-toolbar {
  display: flex;
  align-items: center;
  gap: var(--mdr-space-2);
  margin-left: auto;
  min-width: 0;
  overflow-x: auto;
  overflow-y: hidden;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.mdr-web-toolbar::-webkit-scrollbar {
  display: none;
}

.mdr-web-toolbar > * {
  flex: none;
}

.mdr-web-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  overflow: hidden;
}

.mdr-web-progress::after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  width: 35%;
  background: linear-gradient(90deg, transparent, var(--mdr-web-brand-a), var(--mdr-web-brand-b), transparent);
  animation: mdr-web-progress 1.1s var(--mdr-easing) infinite;
}

.mdr-web-progress[hidden] {
  display: none;
}

@keyframes mdr-web-progress {
  from { transform: translateX(-100%); }
  to { transform: translateX(300%); }
}

/* ---------- Tab strip ---------- */

.mdr-web-tabs {
  position: relative;
  z-index: 20;
  flex: none;
  display: flex;
  align-items: stretch;
  height: 38px;
  padding: 0 6px;
  border-bottom: 1px solid var(--mdr-border);
  background: var(--mdr-bg-subtle);
}

.mdr-web-tablist {
  display: flex;
  align-items: stretch;
  gap: 2px;
  min-width: 0;
  overflow-x: auto;
  overflow-y: hidden;
  scrollbar-width: none;
  -ms-overflow-style: none;
  -webkit-overflow-scrolling: touch;
}

.mdr-web-tablist::-webkit-scrollbar {
  display: none;
}

.mdr-web-tab {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: none;
  max-width: 220px;
  min-width: 84px;
  padding: 0 6px 0 12px;
  border-radius: var(--mdr-radius-md) var(--mdr-radius-md) 0 0;
  color: var(--mdr-fg-muted);
  cursor: pointer;
  user-select: none;
  transition: background-color var(--mdr-duration-fast) var(--mdr-easing),
              color var(--mdr-duration-fast) var(--mdr-easing);
}

.mdr-web-tab:hover {
  background: var(--mdr-web-card);
  color: var(--mdr-fg);
}

.mdr-web-tab.is-active {
  background: var(--mdr-bg);
  color: var(--mdr-fg);
  box-shadow: inset 0 -2px 0 var(--mdr-accent);
}

.mdr-web-tab:focus-visible {
  outline: 2px solid var(--mdr-accent);
  outline-offset: -2px;
}

.mdr-web-tab-title {
  overflow: hidden;
  min-width: 0;
  white-space: nowrap;
  text-overflow: ellipsis;
  font-size: 0.8125rem;
}

.mdr-web-tab-close {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: none;
  width: 20px;
  height: 20px;
  border: none;
  border-radius: var(--mdr-radius-full);
  background: transparent;
  color: inherit;
  font-size: 1rem;
  line-height: 1;
  cursor: pointer;
}

.mdr-web-tab-close:hover {
  background: color-mix(in srgb, var(--mdr-fg) 14%, transparent);
  color: var(--mdr-fg);
}

.mdr-web-tab-add {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: none;
  align-self: center;
  width: 26px;
  height: 26px;
  margin-left: 4px;
  border: none;
  border-radius: var(--mdr-radius-md);
  background: transparent;
  color: var(--mdr-fg-muted);
  cursor: pointer;
}

.mdr-web-tab-add:hover {
  background: var(--mdr-web-card);
  color: var(--mdr-fg);
}

.mdr-web-tab-add .mdr-web-icon {
  width: 16px;
  height: 16px;
}

/* ---------- Buttons ---------- */

.mdr-web-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  height: var(--mdr-web-control-h);
  padding: 0 12px;
  border: 1px solid var(--mdr-border);
  border-radius: var(--mdr-radius-md);
  background: var(--mdr-web-card);
  color: var(--mdr-fg);
  font-size: 0.875rem;
  font-weight: 500;
  white-space: nowrap;
  cursor: pointer;
  transition: background-color var(--mdr-duration-fast) var(--mdr-easing),
              border-color var(--mdr-duration-fast) var(--mdr-easing),
              box-shadow var(--mdr-duration-fast) var(--mdr-easing);
}

.mdr-web-button:hover:not(:disabled) {
  background: var(--mdr-bg-subtle);
  border-color: color-mix(in srgb, var(--mdr-fg-muted) 45%, var(--mdr-border));
}

.mdr-web-button:disabled {
  opacity: 0.5;
  cursor: default;
}

a.mdr-web-button {
  text-decoration: none;
}

.mdr-web-button--icon {
  width: var(--mdr-web-control-h);
  padding: 0;
}

.mdr-web-button--primary {
  border-color: transparent;
  background: linear-gradient(135deg, var(--mdr-web-brand-a), var(--mdr-web-brand-b));
  color: #FFFFFF;
  font-weight: 600;
  box-shadow: 0 1px 2px rgba(47, 129, 247, 0.3), 0 4px 12px -4px rgba(130, 80, 223, 0.5);
}

.mdr-web-button--primary:hover:not(:disabled) {
  background: linear-gradient(135deg, var(--mdr-web-brand-a), var(--mdr-web-brand-b));
  border-color: transparent;
  filter: brightness(1.08);
}

.mdr-web-button--quiet {
  border-color: transparent;
  background: transparent;
  color: var(--mdr-fg-muted);
}

/* ---------- Segmented controls (theme, style) ---------- */

.mdr-web-segmented {
  display: inline-flex;
  align-items: center;
  height: var(--mdr-web-control-h);
  padding: 3px;
  gap: 2px;
  border-radius: var(--mdr-radius-md);
  background: var(--mdr-web-segment-bg);
  border: 1px solid var(--mdr-border);
}

.mdr-web-segmented button {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 100%;
  padding: 0 10px;
  border: none;
  border-radius: 6px;
  background: transparent;
  color: var(--mdr-fg-muted);
  font-size: 0.8125rem;
  font-weight: 500;
  white-space: nowrap;
  cursor: pointer;
  transition: background-color var(--mdr-duration-fast) var(--mdr-easing),
              color var(--mdr-duration-fast) var(--mdr-easing);
}

.mdr-web-segmented button:hover {
  color: var(--mdr-fg);
}

.mdr-web-segmented button[aria-pressed="true"] {
  background: var(--mdr-web-segment-on);
  color: var(--mdr-fg);
  box-shadow: var(--mdr-shadow-sm);
}

/* ---------- Paste view ---------- */

.mdr-web-paste {
  flex: 1 1 auto;
  min-height: 0;
  display: flex;
  align-items: center;
  overflow-y: auto;
  background:
    radial-gradient(1200px 420px at 50% -120px, color-mix(in srgb, var(--mdr-web-brand-a) 14%, transparent), transparent 70%),
    var(--mdr-web-page);
}

.mdr-web-paste-inner {
  display: flex;
  flex-direction: column;
  gap: var(--mdr-space-4);
  width: 100%;
  min-width: 0;
  max-width: 760px;
  margin: 0 auto;
  padding: var(--mdr-space-6) var(--mdr-space-5);
}

.mdr-web-editor {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--mdr-border);
  border-radius: var(--mdr-radius-lg);
  background: var(--mdr-web-card);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04), 0 12px 32px -12px rgba(31, 35, 40, 0.18);
  overflow: hidden;
}

.mdr-web-editor:focus-within {
  border-color: color-mix(in srgb, var(--mdr-accent) 60%, var(--mdr-border));
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--mdr-accent) 18%, transparent),
              0 12px 32px -12px rgba(31, 35, 40, 0.18);
}

.mdr-web-input {
  display: block;
  width: 100%;
  min-height: 52vh;
  padding: var(--mdr-space-4) var(--mdr-space-5);
  border: none;
  outline: none;
  resize: vertical;
  background: var(--mdr-web-input-bg);
  color: var(--mdr-fg);
  font-family: var(--mdr-font-code);
  font-size: 0.875rem;
  line-height: 1.65;
  tab-size: 4;
}

.mdr-web-input::placeholder {
  color: var(--mdr-fg-muted);
  opacity: 0.8;
}

.mdr-web-input:focus-visible {
  outline: none;
}

.mdr-web-editor-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--mdr-space-2);
  padding: var(--mdr-space-3) var(--mdr-space-4);
  border-top: 1px solid var(--mdr-border);
  background: var(--mdr-bg-subtle);
}

.mdr-web-spacer {
  flex: 1 1 auto;
}

.mdr-web-count {
  color: var(--mdr-fg-muted);
  font-size: 0.8125rem;
  font-variant-numeric: tabular-nums;
}

.mdr-web-privacy {
  margin: 0;
  color: var(--mdr-fg-muted);
  font-size: 0.8125rem;
  line-height: 1.5;
  text-align: center;
}

/* ---------- Reader additions ---------- */

#mdr-error-path:empty {
  display: none;
}

.mdr-web-missing-image {
  display: inline-flex;
  align-items: center;
  gap: var(--mdr-space-2);
  max-width: 100%;
  margin: 2px 0;
  padding: 10px 14px;
  border: 1px dashed var(--mdr-border);
  border-radius: var(--mdr-radius-md);
  background: var(--mdr-bg-subtle);
  color: var(--mdr-fg-muted);
  font-size: 0.875rem;
  line-height: 1.4;
  vertical-align: middle;
}

.mdr-web-missing-image .mdr-web-icon {
  width: 18px;
  height: 18px;
}

.mdr-web-missing-image__text {
  overflow: hidden;
  color: var(--mdr-fg);
  text-overflow: ellipsis;
}

.mdr-web-missing-image__note {
  flex: none;
  padding: 1px 6px;
  border-radius: var(--mdr-radius-full);
  background: color-mix(in srgb, var(--mdr-fg-muted) 14%, transparent);
  font-size: 0.75rem;
}

/* ---------- Drop overlay ---------- */

.mdr-web-dropzone {
  position: fixed;
  inset: 0;
  z-index: 60;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--mdr-space-5);
  background: color-mix(in srgb, var(--mdr-bg) 70%, transparent);
  backdrop-filter: blur(3px);
  pointer-events: none; /* the document keeps receiving dragover/drop */
}

.mdr-web-dropzone[hidden] {
  display: none;
}

.mdr-web-dropzone-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--mdr-space-3);
  width: min(520px, 100%);
  padding: var(--mdr-space-7) var(--mdr-space-5);
  border: 2px dashed var(--mdr-accent);
  border-radius: var(--mdr-radius-lg);
  background: var(--mdr-web-card);
  box-shadow: var(--mdr-shadow-lg);
  color: var(--mdr-fg);
  font-size: 1.0625rem;
  font-weight: 600;
}

.mdr-web-dropzone-card .mdr-web-icon {
  width: 36px;
  height: 36px;
  color: var(--mdr-accent);
}

/* ---------- Toast ---------- */

.mdr-web-toast {
  position: fixed;
  left: 50%;
  bottom: var(--mdr-space-5);
  z-index: 70;
  max-width: calc(100vw - 32px);
  padding: 10px 16px;
  border-radius: var(--mdr-radius-md);
  background: var(--mdr-web-toast-bg);
  color: var(--mdr-web-toast-fg);
  box-shadow: var(--mdr-shadow-md);
  font-size: 0.875rem;
  opacity: 0;
  transform: translate(-50%, 8px);
  pointer-events: none;
  transition: opacity var(--mdr-duration-base) var(--mdr-easing),
              transform var(--mdr-duration-base) var(--mdr-easing);
}

.mdr-web-toast.is-visible {
  opacity: 1;
  transform: translate(-50%, 0);
}

/* ---------- Small screens ---------- */

@media (max-width: 760px) {
  .mdr-web-header {
    gap: var(--mdr-space-2);
    padding: 0 var(--mdr-space-2);
  }

  .mdr-web-toolbar {
    gap: 6px;
  }

  .mdr-web-label {
    display: none;
  }

  .mdr-web-segmented button {
    padding: 0 7px;
  }

  .mdr-web-toolbar > .mdr-web-button {
    width: var(--mdr-web-control-h);
    padding: 0;
  }

  .mdr-web-paste-inner {
    padding: var(--mdr-space-5) var(--mdr-space-3);
    gap: var(--mdr-space-3);
  }

  .mdr-web-input {
    min-height: 44vh;
    padding: var(--mdr-space-3);
  }

  .mdr-web-count {
    display: none;
  }

  .mdr-web-tab {
    min-width: 64px;
    max-width: 160px;
    padding: 0 4px 0 10px;
  }
}

@media (max-width: 420px) {
  .mdr-web-brand-name {
    display: none;
  }

  .mdr-web-toolbar {
    gap: 4px;
  }

  .mdr-web-segmented button {
    padding: 0 6px;
  }

  .mdr-web-tab {
    min-width: 48px;
    max-width: 120px;
  }
}

/* ---------- Motion / print ---------- */

@media (prefers-reduced-motion: reduce) {
  .mdr-web-progress::after {
    animation-duration: 3s;
  }

  .mdr-web-toast,
  .mdr-web-button,
  .mdr-web-segmented button {
    transition-duration: 0.01ms !important;
  }
}

@media print {
  .mdr-web-header,
  .mdr-web-tabs,
  .mdr-web-paste,
  #mdr-web-divider,
  .mdr-web-dropzone,
  .mdr-web-toast {
    display: none !important;
  }

  /* Print only the preview, regardless of Edit/Split/Read, and let it flow across pages
     rather than staying clipped to the app's fixed-height scroll box (§10, print.css). */
  .mdr-web-workspace,
  .mdr-web-reader {
    display: block !important;
    overflow: visible !important;
    height: auto !important;
  }
}

/* The closed narrow-mode TOC drawer sits just off-screen; its shadow would still bleed onto the content edge. */
@media (max-width: 899px) {
  .mdr-toc.mdr-toc--closed {
    box-shadow: none;
  }
}