/*
  PDF Redline Compare — additions layered on top of merge-tool.css's shared
  chrome and bates-tool.css's shared components (accordion, status badges).
*/

/* ---------- Dual upload zones ---------- */

.redline-dual-upload {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: stretch;
    gap: 1.25rem;
}

.redline-upload-zone {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.redline-upload-label {
    font-weight: 700;
    font-size: var(--font-size-sm);
    color: var(--color-text);
    text-align: center;
}

.redline-upload-zone .inner-dotted-border {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 1.5rem 1rem;
    border: 2px dashed var(--color-border);
    border-radius: var(--radius-lg);
    background: var(--color-surface);
    transition: border-color var(--transition-fast), background var(--transition-fast);
}

.redline-upload-zone.is-dragover .inner-dotted-border {
    border-color: var(--color-primary);
    background: var(--color-primary-soft, rgba(37, 99, 235, 0.06));
}

.redline-upload-icon {
    font-size: 2rem;
    color: var(--color-primary);
}

.redline-upload-status {
    text-align: center;
    font-size: var(--font-size-sm);
    color: var(--color-muted);
    min-height: 1.2em;
}

.redline-upload-status.is-ready {
    color: var(--color-success, #16a34a);
    font-weight: 600;
}

.redline-upload-status.is-error {
    color: var(--color-danger);
    font-weight: 600;
}

.redline-password-error {
    color: var(--color-danger);
    font-size: var(--font-size-xs, 0.75rem);
    font-weight: 600;
    margin-top: 0.35rem;
    text-align: center;
}

.redline-upload-arrow {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--color-muted);
}

@media (max-width: 767.98px) {
    .redline-dual-upload {
        grid-template-columns: 1fr;
    }
    .redline-upload-arrow {
        transform: rotate(90deg);
    }
}

/* ---------- Empty studio state (shown after "Start over" / on a fresh
   return from the task page — keeps the toolbar/settings chrome instead of
   dropping back to the full landing page) ---------- */

.redline-editor-empty-state {
    flex: 1 1 auto;
    min-height: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1.5rem 1rem;
    overflow: auto;
}

.redline-studio-dual-upload {
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: stretch;
    gap: 1rem;
    width: 100%;
    max-width: 760px;
}

/* Matches the other tools' single-canvas "Drag & drop PDF files here" empty
   state (app.css's .editor-empty-state) — same visual language, just sized to
   sit two-up for Original/Revised instead of one full-width canvas. */
.redline-canvas-dropzone {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.15rem;
    min-height: 220px;
    padding: 1.5rem 1rem;
    border: 2px dashed var(--color-border-strong, var(--color-border));
    border-radius: 16px;
    background: var(--color-surface);
    cursor: pointer;
    text-align: center;
    transition: border-color var(--transition-fast), background var(--transition-fast);
}

.redline-canvas-dropzone:hover,
.redline-canvas-dropzone.is-dragover {
    border-color: var(--color-primary);
    background: var(--color-surface-soft);
}

.redline-canvas-dropzone-label {
    font-weight: 700;
    font-size: var(--font-size-xs, 0.75rem);
    text-transform: uppercase;
    letter-spacing: 0.03em;
    color: var(--color-muted);
    margin-bottom: 0.5rem;
}

.redline-canvas-dropzone .empty-state-pdf-icon {
    display: inline-flex;
    margin-bottom: 0.35rem;
}

.redline-canvas-dropzone h4 {
    margin: 0.15rem 0;
    font-weight: 700;
    font-size: 1rem;
    color: var(--color-text);
}

.redline-canvas-dropzone p {
    color: var(--color-muted);
    font-size: var(--font-size-sm);
    margin: 0;
}

.redline-canvas-dropzone .redline-upload-status {
    margin-top: 0.6rem;
}

@media (max-width: 575.98px) {
    .redline-studio-dual-upload {
        grid-template-columns: 1fr;
    }
    .redline-canvas-dropzone {
        min-height: 180px;
        padding: 1.25rem 0.85rem;
    }
}

/* ---------- Toolbar extras ---------- */

.redline-change-nav {
    display: flex;
    align-items: center;
    gap: 0.35rem;
}

/* ---------- Content area / view modes ---------- */

.redline-content-area {
    flex: 1 1 auto;
    min-height: 0;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.redline-view {
    flex: 1 1 auto;
    min-height: 0;
    display: flex;
}

.redline-pane {
    flex: 1 1 50%;
    display: flex;
    flex-direction: column;
    min-width: 0;
    border-right: 1px solid var(--color-border);
}

.redline-pane:last-child {
    border-right: none;
}

.redline-pane-header {
    padding: 0.5rem 1rem;
    font-size: var(--font-size-sm);
    font-weight: 700;
    color: var(--color-text);
    border-bottom: 1px solid var(--color-border);
    background: var(--color-surface-soft);
}

.redline-pane-scroll {
    flex: 1 1 auto;
    min-height: 0;
    overflow: auto;
    padding: 1rem;
    background: var(--color-canvas);
}

.redline-page-stack {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.redline-page-wrap {
    position: relative;
    flex: 0 0 auto;
    background: #ffffff;
    box-shadow: var(--shadow-md);
}

.redline-page-wrap canvas {
    display: block;
    width: 100%;
    height: 100%;
}

.redline-page-num-badge {
    position: absolute;
    top: 6px;
    left: 6px;
    background: rgba(15, 23, 42, 0.62);
    color: #fff;
    font-size: 0.7rem;
    font-weight: 600;
    line-height: 1;
    padding: 3px 8px;
    border-radius: 999px;
    pointer-events: none;
    z-index: 2;
}

/* Overlay mode — #overlayView holds the holder + the blend-slider bar and
   must stack them vertically; .redline-view's default flex row (correct for
   the Side-by-Side two-pane layout) would otherwise squeeze them side by side. */

#overlayView {
    flex-direction: column;
}

.redline-overlay-holder {
    flex: 1 1 auto;
    min-height: 0;
    overflow: auto;
    padding: 1rem;
    background: var(--color-canvas);
}

.redline-overlay-stack {
    position: relative;
    margin: 0 auto;
    box-shadow: var(--shadow-md);
    background: #ffffff;
}

.redline-overlay-stack canvas {
    display: block;
    position: absolute;
}

.redline-overlay-slider-wrap {
    padding: 0.75rem 1.5rem;
    border-top: 1px solid var(--color-border);
}

/* Changes-only mode */

.redline-changes-list {
    flex: 1 1 auto;
    overflow-y: auto;
    padding: 1rem 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.redline-change-card {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 0.85rem 1rem;
    background: var(--color-surface);
}

.redline-change-card-page {
    font-size: var(--font-size-xs, 0.75rem);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    color: var(--color-muted);
    margin-bottom: 0.4rem;
}

.redline-change-snippet {
    font-size: var(--font-size-sm);
    line-height: 1.5;
}

.redline-change-snippet del {
    color: var(--color-danger);
    background: rgba(220, 38, 38, 0.08);
    text-decoration: line-through;
}

.redline-change-snippet ins {
    color: var(--color-success, #16a34a);
    background: rgba(22, 163, 74, 0.08);
    text-decoration: underline;
}

/* ---------- Responsive / compact layout ---------- */

@media (max-width: 900px) {
    #sideBySideView {
        flex-direction: column;
    }
    .redline-pane {
        border-right: none;
        border-bottom: 1px solid var(--color-border);
        flex: 1 1 50%;
        min-height: 220px;
    }
    .redline-pane:last-child {
        border-bottom: none;
    }
    .redline-pane-header {
        padding: 0.4rem 0.75rem;
        font-size: var(--font-size-xs, 0.75rem);
    }
    .redline-pane-scroll,
    .redline-overlay-holder {
        padding: 0.5rem;
    }
    .redline-page-stack {
        gap: 0.65rem;
    }
    .redline-overlay-slider-wrap {
        padding: 0.6rem 0.85rem;
    }
    .redline-change-nav {
        gap: 0.2rem;
    }
}

@media (max-width: 575.98px) {
    .redline-upload-zone .inner-dotted-border {
        padding: 1rem 0.75rem;
    }
    .redline-pane {
        min-height: 180px;
    }
}