/* ============================================================
   CENTER COLUMN
   ============================================================ */

#center-column {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 360px;
    overflow: hidden;
    position: relative;
}

/* ---- Stats bar (under doc abstract) ---- */
#doc-stats-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font: 11px var(--sans);
    color: var(--td3);
    margin-top: 16px;
    padding-top: 12px;
    border-top: 2px solid var(--doc-ochre-dim);
}
.stat-items { display: flex; gap: 12px; flex-wrap: wrap; }
.stat-item { display: flex; gap: 4px; align-items: center; }
.stat-val { color: var(--td2); font-weight: 500; font-variant-numeric: tabular-nums; }
.stat-item.clickable { cursor: pointer; transition: color var(--dur); }
.stat-item.clickable:hover { color: var(--td2); }
.stat-item.clickable:hover .stat-val { color: var(--accent); }


.section-word-count {
    font: 500 10px var(--sans);
    color: var(--td3);
    background: var(--doc-border-subtle);
    padding: 2px 7px;
    border-radius: var(--radius-xs);
    margin-left: auto;
    flex-shrink: 0;
}

/* ---- Document area ---- */
#document-area {
    flex: 1;
    background: radial-gradient(ellipse at 50% 40%, var(--doc-bg-light) 0%, var(--doc-bg) 70%);
    overflow: hidden;
    position: relative;
}

#document-scroll {
    height: 100%;
    overflow-y: auto;
    padding: 40px 40px 160px;
    scroll-behavior: smooth;
}

/* ---- Document header (title + abstract) ---- */
#doc-header {
    max-width: var(--doc-max-w);
    margin: 0 auto 40px;
}
#doc-header-inner {
    padding: 8px 10px;
    margin: -8px -10px;
    border-radius: var(--radius);
}

.doc-title-row {
    display: flex;
    align-items: flex-start;
    gap: 8px;
}


.doc-title-edit {
    font: 300 36px/1.2 var(--serif);
    color: var(--td1);
    background: none;
    border: none;
    outline: none;
    flex: 1;
    min-width: 0;
    padding: 0;
    letter-spacing: -0.5px;
    caret-color: var(--accent);
    resize: none;
    overflow: hidden;
}
.doc-title-edit::placeholder { color: var(--td3); }
.doc-title-edit:focus { color: var(--td1); }

.doc-desc-edit {
    font: 400 16px/1.82 var(--serif);
    color: var(--td2b);
    background: none;
    border: none;
    outline: none;
    width: 100%;
    padding: 0;
    margin-top: 12px;
    caret-color: var(--accent);
    resize: none;
    overflow: hidden;
}
.doc-desc-edit::placeholder { color: var(--td3); opacity: 0.6; }
.doc-desc-edit:focus { color: var(--td2); }

/* ---- Document meta toggle (⋯ button in title row) ---- */
.doc-meta-toggle-btn {
    flex-shrink: 0;
    opacity: 0;
    transition: opacity var(--dur);
    margin-top: 8px;
}
#doc-header:hover .doc-meta-toggle-btn,
#doc-header.doc-meta-open .doc-meta-toggle-btn { opacity: 1; }

/* ---- Document meta panel (authors) ---- */
.doc-meta-panel {
    padding: 8px 0 0;
    margin: 4px 0 0;
    max-height: 300px;
    opacity: 1;
    overflow: hidden;
    transition: max-height 150ms var(--ease), opacity 150ms var(--ease), padding 150ms var(--ease), margin 150ms var(--ease);
}
.doc-meta-panel.collapsed {
    max-height: 0;
    opacity: 0;
    padding: 0;
    margin: 0;
    pointer-events: none;
}
.doc-meta-label {
    font: 500 11px/1 var(--sans);
    color: var(--td3);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 6px;
}
.doc-author-row {
    display: flex;
    gap: 6px;
    align-items: center;
    margin-bottom: 4px;
}
.doc-author-input {
    flex: 1;
    font: 400 14px/1.5 var(--serif);
    color: var(--td2);
    background: none;
    border: 1px solid var(--doc-border, var(--td4));
    border-radius: var(--radius-xs);
    padding: 4px 8px;
    outline: none;
    min-width: 0;
}
.doc-author-input:focus {
    border-color: var(--doc-ochre-dim);
    color: var(--td1);
}
.doc-author-input::placeholder { color: var(--td3); opacity: 0.6; }
.doc-author-remove {
    flex-shrink: 0;
    width: 22px; height: 22px;
    border: none;
    background: none;
    color: var(--td3);
    cursor: pointer;
    font-size: 16px;
    line-height: 1;
    border-radius: var(--radius-xs);
    display: flex;
    align-items: center;
    justify-content: center;
}
.doc-author-remove:hover { background: var(--doc-hover); color: var(--td1); }
.doc-meta-add-btn {
    font: 400 13px/1 var(--sans);
    color: var(--td3);
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px 0;
    margin-top: 2px;
}
.doc-meta-add-btn:hover { color: var(--td2); }

.doc-header-divider {
    display: none;
}

#sections-container {
    max-width: var(--doc-max-w);
    margin: 0 auto;
}

/* ---- Empty state ---- */
#empty-state {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--doc-bg);
    z-index: var(--z-section);
}

.empty-inner {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    max-width: 380px;
}

.empty-icon {
    margin-bottom: 24px;
    color: var(--td3);
}

.empty-title {
    font: 600 24px/1.3 var(--serif);
    color: var(--td1);
    margin-bottom: 10px;
    letter-spacing: -0.01em;
}

.empty-desc {
    font-size: 14px;
    color: var(--td3);
    line-height: 1.6;
    margin-bottom: 28px;
}

.empty-create-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--doc-ochre);
    border: none;
    color: var(--btn-text);
    font: 500 14px var(--sans);
    padding: 12px 28px;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: background var(--dur), transform var(--dur), box-shadow var(--dur);
    box-shadow: 0 2px 12px rgba(139,58,42,0.20);
}
.empty-create-btn:hover {
    background: var(--doc-ochre-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 20px rgba(139,58,42,0.30);
}
.empty-create-btn:active { transform: translateY(0); }

.empty-actions {
    display: flex;
    gap: 10px;
    align-items: center;
    padding-top: 24px;
    border-top: 1px solid var(--doc-border-subtle);
}

.empty-import-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    background: none;
    border: 1px solid var(--doc-border);
    color: var(--td2);
    font: 500 14px var(--sans);
    padding: 12px 28px;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--dur);
}
.empty-import-btn:hover {
    border-color: var(--doc-ochre);
    color: var(--doc-ochre);
    background: var(--doc-hover-subtle);
}
.empty-import-btn:active { transform: translateY(0); }

.empty-drop-hint {
    font: 400 12px var(--sans);
    color: var(--td3);
    opacity: 0.6;
    margin-top: 14px;
}