/* ===== Lesson Map Modal ===== */

#lessonMapModal {
    position: fixed;
    inset: 0;
    z-index: 2000;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
}

#lessonMapModal.hidden {
    display: none;
}

.lm-modal-inner {
    width: calc(100% - 48px);
    max-width: 1440px;
    height: calc(100% - 80px);
    background: var(--color-bg-primary);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    box-shadow: 0 24px 64px rgba(0, 0, 0, 0.2);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* Header */
.lm-header {
    display: flex;
    align-items: center;
    padding: 0 16px;
    height: 50px;
    flex-shrink: 0;
    border-bottom: 1px solid var(--color-border);
    background: var(--color-bg-secondary);
    gap: 12px;
}

.lm-header-title {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-text-primary);
}

.lm-header-hint {
    font-size: 0.78rem;
    color: var(--color-text-tertiary);
    flex: 1;
}

.lm-close-btn {
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: 6px;
    color: var(--color-text-secondary);
    cursor: pointer;
    font-size: 17px;
    line-height: 1;
    transition: background 0.12s, color 0.12s;
    flex-shrink: 0;
}

.lm-close-btn:hover {
    background: var(--color-bg-hover);
    color: var(--color-text-primary);
}

/* Columns scroll area */
#lmColumns {
    display: flex;
    flex-direction: row;
    align-items: flex-start;
    gap: 14px;
    padding: 18px;
    overflow-x: auto;
    overflow-y: hidden;
    flex: 1;
    min-height: 0;
}

#lmColumns::-webkit-scrollbar {
    height: 8px;
}

#lmColumns::-webkit-scrollbar-track {
    background: var(--color-bg-tertiary);
    border-radius: 4px;
}

#lmColumns::-webkit-scrollbar-thumb {
    background: var(--scrollbar);
    border-radius: 4px;
}

#lmColumns::-webkit-scrollbar-thumb:hover {
    background: var(--scrollbar-hover);
}

/* Page column */
.lm-column {
    width: 210px;
    min-width: 210px;
    max-height: 100%;
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    transition: border-color 0.1s, box-shadow 0.1s;
    position: relative;
}

.lm-column-current {
    border-color: var(--color-accent);
    box-shadow: 0 0 0 2px color-mix(in srgb, var(--color-accent) 20%, transparent);
}

/* Page reorder drop indicators (left/right borders) */
.lm-column.lm-drop-page-before {
    border-left: 3px solid var(--color-accent);
    margin-left: -2px;
}

.lm-column.lm-drop-page-after {
    border-right: 3px solid var(--color-accent);
    margin-right: -2px;
}

/* Column header */
.lm-col-header {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 7px 10px;
    border-bottom: 1px solid var(--color-border);
    border-radius: var(--border-radius) var(--border-radius) 0 0;
    background: var(--color-bg-tertiary);
    user-select: none;
    flex-shrink: 0;
}

.lm-col-title {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-text-primary);
    flex: 1;
    cursor: pointer;
    border-radius: 3px;
    padding: 1px 3px;
    transition: background 0.12s, color 0.12s;
}

.lm-col-title:hover {
    background: var(--color-bg-hover);
    color: var(--color-accent);
}

.lm-col-count {
    font-size: 0.72rem;
    color: var(--color-text-tertiary);
    background: var(--color-bg-primary);
    border: 1px solid var(--color-border);
    border-radius: 10px;
    padding: 0 5px;
    min-width: 18px;
    text-align: center;
    line-height: 1.6;
}

/* Cards scroll area */
.lm-cards {
    display: flex;
    flex-direction: column;
    gap: 5px;
    padding: 8px;
    overflow-y: auto;
    flex: 1;
    min-height: 48px;
    border-radius: 0 0 var(--border-radius) var(--border-radius);
    transition: background 0.1s, outline 0.1s;
}

.lm-cards::-webkit-scrollbar {
    width: 5px;
}

.lm-cards::-webkit-scrollbar-track {
    background: var(--color-bg-tertiary);
    border-radius: 3px;
}

.lm-cards::-webkit-scrollbar-thumb {
    background: var(--scrollbar);
    border-radius: 3px;
}

.lm-cards::-webkit-scrollbar-thumb:hover {
    background: var(--scrollbar-hover);
}

/* Drop-onto-column indicator */
.lm-cards.lm-drop-col {
    background: color-mix(in srgb, var(--color-accent) 8%, transparent);
    outline: 2px dashed var(--color-accent);
    outline-offset: -3px;
    border-radius: 0 0 var(--border-radius) var(--border-radius);
}

/* Message card */
.lm-card {
    display: flex;
    align-items: flex-start;
    gap: 6px;
    padding: 6px 7px 6px 7px;
    background: var(--color-bg-primary);
    border: 1px solid var(--color-border);
    border-radius: 5px;
    cursor: grab;
    transition: border-color 0.1s, box-shadow 0.1s, opacity 0.1s;
    position: relative;
}

.lm-card:hover {
    border-color: var(--color-accent);
    box-shadow: 0 1px 6px rgba(0, 0, 0, 0.07);
}

.lm-card:active {
    cursor: grabbing;
}

.lm-card.lm-dragging {
    opacity: 0.35;
}

/* Card body — badge + preview in a column */
.lm-card-body {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding-right: 18px; /* room for delete button */
}

/* Thumbnail for image / whiteboard messages */
.lm-card-thumb {
    width: 100%;
    max-height: 72px;
    object-fit: cover;
    border-radius: 3px;
    border: 1px solid var(--color-border);
    display: block;
    pointer-events: none;
    user-select: none;
}

/* Delete button — appears on card hover */
.lm-delete-btn {
    position: absolute;
    top: 4px;
    right: 4px;
    width: 17px;
    height: 17px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    border-radius: 3px;
    color: var(--color-text-tertiary);
    font-size: 9px;
    cursor: pointer;
    padding: 0;
    opacity: 0;
    transition: opacity 0.12s, background 0.12s, color 0.12s;
    line-height: 1;
}

.lm-card:hover .lm-delete-btn {
    opacity: 1;
}

.lm-delete-btn:hover {
    background: #fee2e2;
    color: #dc2626;
}

[data-theme="dark"] .lm-delete-btn:hover {
    background: rgba(220, 38, 38, 0.2);
    color: #f87171;
}

/* Message card drop indicators — top/bottom border flash */
.lm-card.lm-drop-before {
    border-top: 2px solid var(--color-accent);
}

.lm-card.lm-drop-after {
    border-bottom: 2px solid var(--color-accent);
}

/* Drag handles */
.lm-drag-handle {
    color: var(--color-text-tertiary);
    font-size: 13px;
    line-height: 1;
    cursor: grab;
    flex-shrink: 0;
    padding-top: 2px;
    user-select: none;
}

.lm-drag-handle:active {
    cursor: grabbing;
}

.lm-page-drag {
    font-size: 14px;
}

/* Role badge */
.lm-role-badge {
    font-size: 0.6rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    padding: 1px 4px;
    border-radius: 3px;
    flex-shrink: 0;
    align-self: flex-start;
    line-height: 1.5;
}

.lm-role-user  { background: var(--color-accent); color: #fff; }
.lm-role-ai    { background: #10b981;             color: #fff; }
.lm-role-image { background: #8b5cf6;             color: #fff; }
.lm-role-board { background: #f59e0b;             color: #fff; }
.lm-role-embed { background: #6366f1;             color: #fff; }

/* Card text preview */
.lm-card-preview {
    font-size: 0.73rem;
    color: var(--color-text-secondary);
    line-height: 1.45;
    overflow: hidden;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    word-break: break-word;
    flex: 1;
    min-width: 0;
}

/* Empty page placeholder */
.lm-empty {
    font-size: 0.78rem;
    color: var(--color-text-tertiary);
    text-align: center;
    padding: 18px 8px;
    font-style: italic;
}

/* Map button in page indicator */
.page-map-btn {
    width: 24px;
    height: 24px;
    min-width: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    color: var(--color-text-secondary);
    cursor: pointer;
    padding: 0;
    transition: background 0.12s, border-color 0.12s, color 0.12s;
}

.page-map-btn:hover {
    background: var(--color-bg-hover);
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.page-map-btn:active {
    transform: scale(0.9);
}