/* attach styling */
#attachement-button {
    width: 40px;
    margin-right: 15px;
    cursor: pointer;
}
.attachement-preview-container {
    position: relative;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    overflow: hidden;
    background-color: #f0f0f0;
    display: flex;
    align-items: center;
    justify-content: center;
}
.attachement-preview-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
}
.attachement-preview-icon i {
    color: #d32f2f;
    font-size: 20px;
}
.delete-attachement {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s;
    cursor: pointer;
}
.attachement-preview-container:hover .delete-attachement {
    opacity: 1;
}
.delete-attachement i {
    color: white;
    font-size: 16px;
}


/* exam mode tag */
.solver-mode-tag {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: fit-content;
    margin: 12px auto;
    padding: 6px 18px;
    border-radius: 20px;
    background: var(--primary-light);
    font-family: var(--font-text-secondary);
    font-size: 14px;
    color: var(--text-dark);
}
.solver-mode-tag i {
    font-size: 13px;
    color: var(--accent);
}

/* solver welcome - mode chooser */
.solver-mode-cards {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-top: 14px;
}
.solver-mode-card {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 12px 18px;
    background-color: var(--bg);
    border: 1.5px solid var(--primary-light);
    border-radius: 15px;
    cursor: pointer;
    transition: all 0.25s ease;
    position: relative;
}
.solver-mode-card:hover {
    border-color: var(--primary);
    transform: translateX(4px);
}
.solver-mode-card.selected {
    border-color: var(--accent);
    background-color: var(--primary-light);
}
.solver-mode-cards.locked .solver-mode-card {
    cursor: default;
    pointer-events: none;
}
.solver-mode-cards.locked .solver-mode-card:not(.selected) {
    opacity: 0.5;
}
.solver-mode-checkbox {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}
.solver-mode-checkbox-box {
    flex-shrink: 0;
    width: 20px;
    height: 20px;
    border: 2px solid var(--grey-blue);
    border-radius: 5px;
    background-color: var(--bg);
    position: relative;
    transition: all 0.2s ease;
}
.solver-mode-card:hover .solver-mode-checkbox-box {
    border-color: var(--primary-saturated);
}
.solver-mode-checkbox:checked + .solver-mode-checkbox-box {
    background-color: var(--accent);
    border-color: var(--accent);
}
.solver-mode-checkbox:checked + .solver-mode-checkbox-box::after {
    content: '';
    position: absolute;
    left: 5px;
    top: 1px;
    width: 5px;
    height: 10px;
    border: solid var(--text-light);
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}
.solver-mode-card-content {
    display: flex;
    flex-direction: column;
    gap: 2px;
    flex: 1;
}
.solver-mode-card-title {
    font-family: var(--font-text);
    font-size: 18px;
    font-weight: 600;
    color: var(--text-dark);
}
.solver-mode-card-desc {
    font-family: var(--font-text-secondary);
    font-size: 15px;
    color: var(--grey-blue);
}


/* resource picker */
/* popup sizing */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    overflow-y: auto;
}
.modal-content {
    background-color: white;
    margin: 50px auto;
    width: 90%;
    max-width: 700px;
    border-radius: 5px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.2);
    overflow: hidden;
}
.modal-header {
    padding: 15px 20px;
    border-bottom: 1px solid #e0e0e0;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.modal-header h2 {
    font-family: var(--font-titles);
    color: var(--text-dark);
    font-size: 20px;
    margin: 0;
}
.close {
    font-size: 24px;
    color: #999;
    cursor: pointer;
    transition: color 0.2s;
}
.close:hover {
    color: var(--accent);
}
.modal-body {
    padding: 20px 40px;
}
.resource-picker {
    max-width: 650px;
}
/* body layout */
.resource-picker-body {
    display: flex;
    flex-direction: column;
    gap: 30px;
}
/* section */
.picker-section {
    display: flex;
    flex-direction: column;
}
.picker-section h3 {
    display: none;
    font-family: var(--font-titles);
    font-size: 18px;
    margin-bottom: 10px;
}
.picker-section:last-child h3 {
    display: block;
}
/* upload tiles */
.upload-tile {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 15px 20px;
    background-color: var(--primary-light);
    border-radius: 15px;
    cursor: pointer;
    transition: 0.3s;
    font-family: var(--font-text);
}
.upload-tile i {
    font-size: 22px;
    color: var(--primary-saturated);
}
.upload-tile:hover {
    transform: translateX(5px);
    filter: brightness(0.95);
}
/* filters */
.resource-filters {
    display: flex;
    gap: 10px;
    margin-bottom: 15px;
}
.resource-filters input,
.resource-filters select {
    flex: 1;
    padding: 8px 12px;
    border-radius: 10px;
    border: 1px solid #ddd;
    font-family: var(--font-text-secondary);
}
/* resource list */
.resource-list {
    max-height: 200px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 15px;
}
/* resource item */
.resource-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 15px;
    border-radius: 12px;
    cursor: pointer;
    background-color: #f7f9fb;
    transition: 0.3s;
}
.resource-item:hover {
    background-color: var(--primary-light);
}
.resource-item input {
    accent-color: var(--primary-saturated);
}
.resource-info {
    width: 90%;
    display: flex;
    justify-content: space-between;
    gap: 5px;
}
.resource-name {
    font-family: var(--font-text);
    font-weight: 600;
}
/* tags */
.resource-tags {
    display: flex;
    gap: 8px;
}
.tag {
    font-size: 12px;
    padding: 3px 8px;
    border-radius: 10px;
    background-color: var(--primary);
}
.tag.course {
    background-color: var(--grey-blue);
    color: white;
}
.tag.type {
    background-color: var(--accent-light);
    color: white;
}
/* choose button */
.choose-resource-btn {
    background-color: var(--primary-saturated);
    color: white;
    border: none;
    padding: 10px 15px;
    border-radius: 5px;
    font-family: var(--font-text);
    font-size: 16px;
    cursor: pointer;
    align-self: flex-end;
    transition: background-color 0.3s ease;
}
.choose-resource-btn:hover {
    background-color: #0188c0;
}


/* attach button — light mode base color */
#attachement-button {
    color: var(--grey-blue);
    transition: color 0.2s;
}
#attachement-button:hover {
    color: var(--text-dark);
}

/* dark mode */
body.dark-mode .attachement-preview-container {
    background-color: #3a3d42;
}

body.dark-mode .modal-content {
    background-color: #2b2d31;
    color: var(--text-dark);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
}
body.dark-mode .modal-header {
    border-bottom-color: #3a3d42;
}
body.dark-mode .close {
    color: var(--grey-blue);
}
body.dark-mode .close:hover {
    color: var(--accent);
}

body.dark-mode .upload-tile {
    background-color: #35373c;
    color: var(--text-dark);
}
body.dark-mode .upload-tile:hover {
    filter: brightness(1.1);
}

body.dark-mode .resource-filters input,
body.dark-mode .resource-filters select {
    background-color: #1e1f22;
    border-color: #3a3d42;
    color: var(--text-dark);
    outline: none;
}
body.dark-mode .resource-filters input:focus,
body.dark-mode .resource-filters select:focus {
    border-color: var(--primary-saturated);
}
body.dark-mode .resource-filters select option {
    background-color: #2b2d31;
    color: var(--text-dark);
}

body.dark-mode .resource-list {
    scrollbar-width: thin;
    scrollbar-color: #3a3d42 transparent;
}
body.dark-mode .resource-list::-webkit-scrollbar {
    width: 5px;
}
body.dark-mode .resource-list::-webkit-scrollbar-track {
    background: transparent;
}
body.dark-mode .resource-list::-webkit-scrollbar-thumb {
    background-color: #3a3d42;
    border-radius: 10px;
}

body.dark-mode .resource-item {
    background-color: #1e1f22;
    color: var(--text-dark);
}
body.dark-mode .resource-item:hover {
    background-color: #35373c;
}
body.dark-mode .resource-name {
    color: var(--text-dark);
}
body.dark-mode .picker-section h4 {
    color: var(--grey-blue);
    font-size: 15px;
    margin-bottom: 12px;
}