/* ==========================================
   DOCUMENT MANAGER MODAL
   Visual Design Overhaul
   ========================================== */

/* --- Keyframes --- */
@keyframes floatUpDown {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-4px); }
}

@keyframes uploadShimmer {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}

@keyframes emptyPulse {
    0%, 100% { opacity: 0.3; }
    50% { opacity: 0.5; }
}

/* --- Modal Backdrop --- */
#documentManagerModal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    z-index: 2500;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s ease;
}

#documentManagerModal.visible {
    opacity: 1;
    pointer-events: auto;
}

/* --- Modal Content Panel --- */
.document-manager-content {
    background: linear-gradient(180deg, #141416 0%, var(--panel-bg, #09090b) 100%);
    border: 1px solid var(--border-subtle, rgba(255, 255, 255, 0.04));
    border-radius: 14px;
    width: 90%;
    max-width: 700px;
    height: 80vh;
    max-height: 620px;
    display: flex;
    flex-direction: column;
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.6), inset 0 1px 0 rgba(255, 255, 255, 0.04);
    transform: translateY(20px) scale(0.98);
    transition: transform 0.3s cubic-bezier(0.32, 0.72, 0, 1), opacity 0.2s ease;
    overflow: hidden;
}

#documentManagerModal.visible .document-manager-content {
    transform: translateY(0) scale(1);
}

/* --- Drag Handle (mobile only) --- */
.doc-manager-handle {
    display: none;
}

/* --- Header --- */
.document-manager-header {
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-subtle, rgba(255, 255, 255, 0.04));
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-shrink: 0;
}

.document-manager-title {
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: var(--font-display, 'DM Sans', sans-serif);
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text-primary, #e4e4e7);
    letter-spacing: -0.01em;
}

.document-manager-title i {
    color: var(--accent, #3bf692);
    font-size: 0.95rem;
}

.document-count-badge {
    background: var(--accent, #3bf692);
    color: #09090b;
    padding: 2px 8px;
    border-radius: 10px;
    font-size: 0.7rem;
    font-weight: 700;
    font-family: var(--font-display, 'DM Sans', sans-serif);
    letter-spacing: 0.02em;
    min-width: 20px;
    text-align: center;
}

/* --- Body --- */
.document-manager-body {
    flex: 1;
    overflow-y: auto;
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    min-height: 0;
}

/* Themed scrollbar for body */
.document-manager-body::-webkit-scrollbar {
    width: 4px;
}
.document-manager-body::-webkit-scrollbar-track {
    background: transparent;
}
.document-manager-body::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.08);
    border-radius: 4px;
}
.document-manager-body::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.14);
}


/* ==========================================
   1. UPLOAD ZONE — Interactive Drop Zone
   ========================================== */

.document-upload-area {
    border: 2px dashed var(--border-medium, rgba(255, 255, 255, 0.07));
    border-radius: 10px;
    background: linear-gradient(135deg, rgba(59, 246, 146, 0.015) 0%, transparent 60%);
    transition: all 0.3s ease;
    flex-shrink: 0;
}

.document-upload-area:hover {
    border-color: rgba(255, 255, 255, 0.1);
    background: linear-gradient(135deg, rgba(59, 246, 146, 0.025) 0%, transparent 60%);
}

.document-upload-area.drag-over {
    border-color: var(--accent, #3bf692);
    background: rgba(59, 246, 146, 0.06);
    box-shadow: var(--glow-accent, 0 0 16px rgba(59, 246, 146, 0.1)), inset 0 0 30px rgba(59, 246, 146, 0.03);
}

.upload-drop-zone {
    padding: 16px 16px 14px;
    text-align: center;
    cursor: pointer;
}

.upload-drop-zone i {
    font-size: 1.6rem;
    color: var(--accent, #3bf692);
    margin-bottom: 6px;
    display: block;
    animation: floatUpDown 2.5s ease-in-out infinite;
    opacity: 0.8;
}

.document-upload-area.drag-over .upload-drop-zone i {
    opacity: 1;
    color: var(--accent, #3bf692);
    filter: drop-shadow(0 0 6px rgba(59, 246, 146, 0.3));
}

.upload-text {
    margin: 0 0 2px 0;
    font-size: 0.88rem;
    color: var(--text-primary, #e4e4e7);
    font-weight: 500;
    font-family: var(--font-display, 'DM Sans', sans-serif);
}

.upload-hint {
    margin: 0 0 10px 0;
    font-size: 0.75rem;
    color: var(--text-muted, #52525b);
    line-height: 1.4;
}

.upload-btn {
    padding: 7px 16px;
    border-radius: 6px;
    font-size: 0.82rem;
    font-family: var(--font-display, 'DM Sans', sans-serif);
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    -webkit-tap-highlight-color: transparent;
    transition: all 0.2s ease;
}

.upload-btn:hover {
    box-shadow: 0 0 12px rgba(59, 246, 146, 0.12);
}

.upload-btn:active,
.upload-btn:focus,
.upload-btn:focus-visible {
    background: linear-gradient(135deg, var(--accent, #3bf692), #2563eb) !important;
    color: #fff !important;
    border-color: transparent !important;
    outline: none !important;
    box-shadow: 0 2px 8px rgba(37, 99, 235, 0.3) !important;
}


/* ==========================================
   2. DOCUMENT LIST
   ========================================== */

.document-list-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 0;
}

.document-list-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border-subtle, rgba(255, 255, 255, 0.04));
}

.document-list-header span {
    font-size: 0.82rem;
    color: var(--text-muted, #52525b);
    font-weight: 500;
    font-family: var(--font-display, 'DM Sans', sans-serif);
    letter-spacing: 0.01em;
}

.btn-text-danger {
    background: none;
    border: none;
    color: var(--error, #ef4444);
    cursor: pointer;
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 0.8rem;
    font-family: var(--font-display, 'DM Sans', sans-serif);
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 6px;
}

.btn-text-danger:hover {
    background: rgba(239, 68, 68, 0.1);
}


/* ==========================================
   3. RESPONSIVE GRID LAYOUT
   ========================================== */

.document-list-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 12px;
    overflow-y: auto;
    flex: 1;
    align-content: start;
    padding: 2px;
}

/* Themed scrollbar for grid */
.document-list-grid::-webkit-scrollbar {
    width: 4px;
}
.document-list-grid::-webkit-scrollbar-track {
    background: transparent;
}
.document-list-grid::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.08);
    border-radius: 4px;
}


/* ==========================================
   2 & 8. DOCUMENT CARDS + FILE TYPE BADGES
   ========================================== */

.document-card {
    background: var(--card-bg, #18181b);
    border: 1px solid var(--border-subtle, rgba(255, 255, 255, 0.04));
    border-radius: 8px;
    padding: 8px;
    display: flex;
    flex-direction: column;
    gap: 6px;
    transition: all 0.2s ease;
    cursor: pointer;
    position: relative;
}

.document-card:hover {
    border-color: var(--border-emphasis, rgba(255, 255, 255, 0.12));
    background: var(--surface-hover, #1a1a1d);
    box-shadow: var(--glow-accent, 0 0 16px rgba(59, 246, 146, 0.1));
}

/* Preview area */
.document-card-preview {
    width: 100%;
    height: 80px;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--input-bg, #121214);
    overflow: hidden;
    position: relative;
    box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.2);
}

.document-card-preview img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.document-card:hover .document-card-preview img {
    transform: scale(1.03);
}

.document-card-preview i {
    font-size: 1.5rem;
    opacity: 0.5;
    transition: opacity 0.2s ease;
}

.document-card:hover .document-card-preview i {
    opacity: 0.7;
}

/* File type tinted backgrounds for icon previews */
.document-card-preview.preview-image { background: rgba(59, 130, 246, 0.06); }
.document-card-preview.preview-image i { color: #60a5fa; }

.document-card-preview.preview-pdf { background: rgba(239, 68, 68, 0.06); }
.document-card-preview.preview-pdf i { color: #f87171; }

.document-card-preview.preview-word { background: rgba(59, 130, 246, 0.08); }
.document-card-preview.preview-word i { color: #93c5fd; }

.document-card-preview.preview-excel { background: rgba(16, 185, 129, 0.06); }
.document-card-preview.preview-excel i { color: #6ee7b7; }

.document-card-preview.preview-ppt { background: rgba(245, 158, 11, 0.06); }
.document-card-preview.preview-ppt i { color: #fbbf24; }

.document-card-preview.preview-text { background: rgba(113, 113, 122, 0.06); }
.document-card-preview.preview-text i { color: #a1a1aa; }

.document-card-preview.preview-default { background: rgba(113, 113, 122, 0.04); }
.document-card-preview.preview-default i { color: #71717a; }

/* File type badge */
.doc-type-badge {
    position: absolute;
    top: 6px;
    left: 6px;
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.58rem;
    font-weight: 700;
    font-family: var(--font-display, 'DM Sans', sans-serif);
    letter-spacing: 0.04em;
    text-transform: uppercase;
    z-index: 1;
    line-height: 1.3;
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
}

.badge-image   { background: rgba(59, 130, 246, 0.25);  color: #60a5fa; }
.badge-pdf     { background: rgba(239, 68, 68, 0.25);   color: #f87171; }
.badge-word    { background: rgba(59, 130, 246, 0.3);    color: #93c5fd; }
.badge-excel   { background: rgba(16, 185, 129, 0.25);   color: #6ee7b7; }
.badge-ppt     { background: rgba(245, 158, 11, 0.25);   color: #fbbf24; }
.badge-text    { background: rgba(113, 113, 122, 0.25);  color: #a1a1aa; }
.badge-default { background: rgba(113, 113, 122, 0.2);   color: #71717a; }

/* Card info */
.document-card-info {
    flex: 1;
    min-width: 0;
}

.document-card-name {
    font-size: 0.78rem;
    font-weight: 500;
    font-family: var(--font-display, 'DM Sans', sans-serif);
    color: var(--text-primary, #e4e4e7);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    margin-bottom: 2px;
    letter-spacing: -0.01em;
}

.document-card-size {
    font-size: 0.68rem;
    color: var(--text-muted, #52525b);
    font-variant-numeric: tabular-nums;
    letter-spacing: 0.02em;
}


/* ==========================================
   5. CARD ACTIONS — Contextual Overlay
   ========================================== */

.document-card-actions {
    position: absolute;
    top: 6px;
    right: 6px;
    display: flex;
    gap: 4px;
    opacity: 0;
    transition: opacity 0.2s ease;
}

.document-card:hover .document-card-actions {
    opacity: 1;
}

.document-card-download,
.document-card-remove,
.document-card-toggle {
    width: 26px;
    height: 26px;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: 1px solid var(--border-medium, rgba(255, 255, 255, 0.07));
    border-radius: 6px;
    color: var(--text-secondary, #71717a);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.7rem;
    transition: all 0.2s ease;
}

.document-card-download:hover {
    background: var(--accent, #3bf692);
    color: #09090b;
    border-color: var(--accent, #3bf692);
    box-shadow: 0 0 10px rgba(59, 246, 146, 0.2);
}

.document-card-remove:hover {
    background: var(--error, #ef4444);
    color: white;
    border-color: var(--error, #ef4444);
    box-shadow: 0 0 10px rgba(239, 68, 68, 0.2);
}

/* Active/inactive toggle for attachment inclusion in live+QA answers */
.document-card.is-active .document-card-toggle {
    color: var(--accent, #3bf692);
}
.document-card.is-inactive .document-card-toggle {
    color: var(--text-secondary, #71717a);
}
.document-card-toggle:hover {
    background: var(--accent, #3bf692);
    color: #09090b;
    border-color: var(--accent, #3bf692);
}
/* Toggle button is always visible (not just on hover) so users can see state at a glance */
.document-card-actions .document-card-toggle {
    opacity: 1;
}
.document-card-actions {
    opacity: 1; /* Always show actions row so toggle state is visible */
}
/* Dim inactive cards so the state is immediately obvious */
.document-card.is-inactive {
    opacity: 0.55;
    filter: grayscale(0.4);
}
.document-card.is-inactive:hover {
    opacity: 0.85;
}


/* ==========================================
   6. UPLOAD PROGRESS — Shimmer State
   ========================================== */

.document-card.uploading {
    pointer-events: none;
}

.document-card.uploading::after {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 8px;
    background: linear-gradient(
        110deg,
        transparent 30%,
        rgba(59, 246, 146, 0.04) 50%,
        transparent 70%
    );
    background-size: 200% 100%;
    animation: uploadShimmer 1.5s ease-in-out infinite;
    z-index: 2;
}

.document-card-progress {
    position: absolute;
    bottom: 0;
    left: 0;
    height: 3px;
    background: var(--accent, #3bf692);
    border-radius: 0 0 8px 8px;
    width: 0%;
    transition: width 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 3;
    box-shadow: 0 0 6px rgba(59, 246, 146, 0.3);
}

.document-card.uploading .document-card-progress {
    width: 100%;
}

/* Loading image placeholder */
.doc-img-loading {
    opacity: 0.3;
    filter: blur(2px);
    transition: opacity 0.3s ease, filter 0.3s ease;
}


/* ==========================================
   7. EMPTY STATE — Visually Rich
   ========================================== */

.document-list-empty {
    text-align: center;
    padding: 40px 20px;
    color: var(--text-secondary, #71717a);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
}

.empty-state-icon {
    font-size: 2.5rem;
    color: var(--accent, #3bf692);
    animation: emptyPulse 3s ease-in-out infinite;
    margin-bottom: 4px;
}

.empty-state-title {
    margin: 0;
    font-size: 0.92rem;
    font-weight: 500;
    font-family: var(--font-display, 'DM Sans', sans-serif);
    color: var(--text-primary, #e4e4e7);
    letter-spacing: -0.01em;
}

.empty-state-hint {
    margin: 0;
    font-size: 0.78rem;
    color: var(--text-muted, #52525b);
    line-height: 1.4;
}

/* Fallback for old empty state markup (single <i> + <p>) */
.document-list-empty > i {
    font-size: 2rem;
    opacity: 0.3;
    margin-bottom: 8px;
}

.document-list-empty > p {
    margin: 0;
    font-size: 0.85rem;
}


/* ==========================================
   MOBILE — Bottom Sheet + Responsive
   ========================================== */

/* Tablet breakpoint */
@media (max-width: 768px) {
    .document-list-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* Mobile breakpoint */
@media (max-width: 600px) {
    /* Bottom sheet positioning */
    #documentManagerModal {
        align-items: flex-end;
    }

    .document-manager-content {
        width: 100%;
        max-width: 100%;
        height: 88vh;
        max-height: 88vh;
        border-radius: 20px 20px 0 0;
        border: none;
        border-top: 1px solid rgba(255, 255, 255, 0.06);
        box-shadow: 0 -10px 40px rgba(0, 0, 0, 0.5), inset 0 1px 0 rgba(255, 255, 255, 0.04);
        transform: translateY(100%);
        transition: transform 0.35s cubic-bezier(0.32, 0.72, 0, 1);
        padding-bottom: max(12px, env(safe-area-inset-bottom, 12px));
    }

    #documentManagerModal.visible .document-manager-content {
        transform: translateY(0);
        scale: unset;
    }

    /* Drag handle — visible on mobile */
    .doc-manager-handle {
        display: block;
        width: 36px;
        height: 5px;
        background: rgba(255, 255, 255, 0.25);
        border-radius: 3px;
        margin: 10px auto 0 auto;
        flex-shrink: 0;
    }

    .document-manager-header {
        padding: 10px 16px 14px;
    }

    .document-manager-body {
        padding: 12px;
        gap: 14px;
    }

    .upload-drop-zone {
        padding: 12px;
    }

    .upload-drop-zone i {
        font-size: 1.3rem;
    }

    /* 2-col grid */
    .document-list-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 10px;
    }

    .document-card-preview {
        height: 65px;
    }

    /* Actions always visible on touch (no hover) */
    .document-card-actions {
        opacity: 1;
    }

    .document-card-download,
    .document-card-remove {
        width: 24px;
        height: 24px;
        background: rgba(0, 0, 0, 0.6);
        backdrop-filter: blur(6px);
        -webkit-backdrop-filter: blur(6px);
    }

    /* Smaller empty state padding */
    .document-list-empty {
        padding: 28px 16px;
    }
}