/* Công dụng: Custom CSS cho animations và Material Icons */

/* Material Symbols Configuration */
.material-symbols-outlined {
    font-variation-settings: 'FILL' 0, 'wght' 400, 'GRAD' 0, 'opsz' 24;
}

/* Smooth transitions */
* {
    transition-property: background-color, border-color, color;
    transition-duration: 300ms;
    transition-timing-function: ease-in-out;
}

/* Fade in animation */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-fade-in {
    animation: fadeIn 0.5s ease-out;
}

/* Prevent transition on page load */
.preload * {
    transition: none !important;
}

/* Custom scrollbar */
::-webkit-scrollbar {
    width: 8px;
    cursor: pointer;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: #cbd5e1;
    border-radius: 4px;
    cursor: pointer;
}

.dark ::-webkit-scrollbar-thumb {
    background: #2B1A4B;
}

::-webkit-scrollbar-thumb:hover {
    background: #94a3b8;
    cursor: pointer;
}

.dark ::-webkit-scrollbar-thumb:hover {
    background: #3d2660;
    cursor: pointer;
}

/* ============================================
   FILE UPLOAD ZONE
   ============================================ */

.upload-zone {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    min-height: 88px;
    border: 2px dashed #cbd5e1;
    border-radius: 12px;
    padding: 16px;
    cursor: pointer;
    background-color: #f8fafc;
    transition: border-color 0.2s ease, background-color 0.2s ease, transform 0.1s ease;
    user-select: none;
}

.upload-zone:hover {
    border-color: #4F46E5;
    background-color: #eef2ff;
}

.upload-zone.dragover {
    border-color: #4F46E5;
    background-color: #eef2ff;
    transform: scale(1.01);
    box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.1);
}

.dark .upload-zone {
    border-color: #2B1A4B;
    background-color: #160C2C;
    color: #a092c4;
}

.dark .upload-zone:hover {
    border-color: #A339FF;
    background-color: #1e1040;
}

.dark .upload-zone.dragover {
    border-color: #A339FF;
    background-color: #1e1040;
    box-shadow: 0 0 0 4px rgba(163, 57, 255, 0.1);
}

.upload-zone-icon {
    font-size: 32px;
    color: #94a3b8;
    transition: color 0.2s ease;
}

.upload-zone:hover .upload-zone-icon,
.upload-zone.dragover .upload-zone-icon {
    color: #4F46E5;
}

.dark .upload-zone:hover .upload-zone-icon,
.dark .upload-zone.dragover .upload-zone-icon {
    color: #A339FF;
}

.upload-zone-text {
    font-size: 13px;
    font-weight: 500;
    color: #64748b;
    text-align: center;
}

.upload-zone-subtext {
    font-size: 11px;
    color: #94a3b8;
}

/* File badge — hiển thị tên file đã chọn */
.file-badge {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    border-radius: 8px;
    background-color: #eef2ff;
    border: 1px solid #c7d2fe;
    font-size: 13px;
    color: #4338ca;
    font-weight: 500;
    max-width: 100%;
    animation: fadeIn 0.3s ease-out;
}

.dark .file-badge {
    background-color: #1e1040;
    border-color: #3d2660;
    color: #c4b5fd;
}

.file-badge-name {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 320px;
}

.file-badge-remove {
    flex-shrink: 0;
    cursor: pointer;
    display: flex;
    align-items: center;
    color: #818cf8;
    border-radius: 4px;
    padding: 2px;
    transition: color 0.15s ease, background-color 0.15s ease;
}

.file-badge-remove:hover {
    color: #ef4444;
    background-color: rgba(239, 68, 68, 0.1);
}

/* Truncated warning */
.truncate-warning {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 11px;
    color: #d97706;
    font-weight: 500;
    padding: 4px 8px;
    background-color: #fffbeb;
    border: 1px solid #fde68a;
    border-radius: 6px;
    animation: fadeIn 0.3s ease-out;
}

.dark .truncate-warning {
    background-color: #1c1200;
    border-color: #854d0e;
    color: #fbbf24;
}

/* Processing spinner for file reading */
.upload-processing {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: #64748b;
}

.upload-spinner {
    width: 16px;
    height: 16px;
    border: 2px solid #e2e8f0;
    border-top-color: #4F46E5;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.dark .upload-spinner {
    border-color: #2B1A4B;
    border-top-color: #A339FF;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ============================================
   TEXTAREA WRAPPER + INTEGRATED UPLOAD
   ============================================ */

.textarea-wrapper {
    position: relative;
    width: 100%;
}

/* Drag-over highlight trên toàn bộ wrapper */
.textarea-wrapper.dragover textarea {
    border-color: #4F46E5 !important;
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
}

.dark .textarea-wrapper.dragover textarea {
    border-color: #A339FF !important;
    box-shadow: 0 0 0 3px rgba(163, 57, 255, 0.15);
}

/* Attach button — nằm ở góc dưới bên phải bên trong textarea */
.attach-btn {
    position: absolute;
    bottom: 10px;
    right: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 34px;
    height: 34px;
    border-radius: 8px;
    background-color: rgba(248, 250, 252, 0.85);
    border: 1px solid #e2e8f0;
    color: #64748b;
    cursor: pointer;
    backdrop-filter: blur(4px);
    transition: background-color 0.15s ease, color 0.15s ease,
                border-color 0.15s ease, transform 0.1s ease;
    z-index: 10;
}

.attach-btn:hover {
    background-color: #eef2ff;
    border-color: #4F46E5;
    color: #4F46E5;
    transform: scale(1.08);
}

.attach-btn:active {
    transform: scale(0.95);
}

.dark .attach-btn {
    background-color: rgba(22, 12, 44, 0.85);
    border-color: #2B1A4B;
    color: #a092c4;
}

.dark .attach-btn:hover {
    background-color: #1e1040;
    border-color: #A339FF;
    color: #A339FF;
}

.attach-btn-icon {
    font-size: 18px;
    line-height: 1;
}

/* Loading state — khi đang đọc file */
.attach-btn.loading {
    pointer-events: none;
    opacity: 0.7;
}

.attach-btn.loading .attach-btn-icon {
    display: none;
}

.attach-btn.loading .upload-spinner {
    display: block !important;
}

/* Drop overlay — phủ lên textarea khi kéo file vào */
.drop-overlay {
    position: absolute;
    inset: 0;
    border-radius: 12px;
    background-color: rgba(238, 242, 255, 0.92);
    border: 2px dashed #4F46E5;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 6px;
    color: #4F46E5;
    pointer-events: none;
    z-index: 20;
    backdrop-filter: blur(2px);
    animation: fadeIn 0.15s ease-out;
}

.dark .drop-overlay {
    background-color: rgba(30, 16, 64, 0.92);
    border-color: #A339FF;
    color: #c4b5fd;
}