/* ========================================
   CARDS - Student tiles, topic cards, material cards
   ======================================== */

/* ========== GRID LAYOUTS ========== */
.students-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 10px;
    width: 100%;
    max-width: 960px;
    margin-bottom: 24px;
}

.topics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(175px, 1fr));
    gap: 15px;
    margin-top: 4px;
}

.materials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 20px;
}

/* ========== STUDENT TILES ========== */
.student-tile {
    display: flex;
    align-items: center;
    gap: 12px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 11px;
    padding: 14px 16px;
    cursor: pointer;
    transition: all 0.2s ease;
    position: relative;
    z-index: 1;
}

.student-tile:hover {
    z-index: 10;
    background: hsl(var(--student-hue, 0), 20%, 22%);
    border-color: hsl(var(--student-hue, 0), 18%, 30%);
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.12);
}

[data-theme="light"] .student-tile:hover {
    background: hsl(var(--student-hue, 0), 25%, 92%);
    border-color: hsl(var(--student-hue, 0), 20%, 84%);
    box-shadow: 0 6px 20px rgba(27, 40, 56, 0.06);
}

.student-name {
    font-family: var(--font-serif-body);
    font-size: 13px;
    font-weight: 500;
    color: var(--text-primary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    flex: 1;
    min-width: 0;
}

.student-tile:hover .menu-btn {
    opacity: 0.6;
}

.student-description {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* ========== TOPIC CARDS ========== */
.topic-card {
    background: var(--bg-secondary);
    /* border: 1px solid var(--border-color); */
    border-radius: 12px;
    padding: 16px 16px 12px;
    cursor: pointer;
    transition: all 0.25s ease;
    position: relative;
    min-height: 110px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.06);
}

.topic-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
    border-color: color-mix(in srgb, var(--accent-primary) 30%, var(--border-color));
}

.topic-card.DONE {
    /* border-color: color-mix(in srgb, var(--green) 35%, transparent); */
    background: linear-gradient(145deg, color-mix(in srgb, var(--green) 12%, transparent), color-mix(in srgb, var(--green) 4%, transparent));
    box-shadow: 0 2px 8px color-mix(in srgb, var(--green) 20%, transparent), 0 1px 3px color-mix(in srgb, var(--green) 20%, transparent);
}

.topic-card.DONE:hover {
    /* border-color: color-mix(in srgb, var(--green) 65%, transparent); */
    box-shadow: 0 6px 20px color-mix(in srgb, var(--green) 30%, transparent), 0 2px 6px color-mix(in srgb, var(--green) 30%, transparent);
}

.topic-card.REPEAT {
    /* border-color: color-mix(in srgb, var(--orange) 35%, transparent); */
    background: linear-gradient(145deg, color-mix(in srgb, var(--orange) 12%, transparent), color-mix(in srgb, var(--orange) 4%, transparent));
    box-shadow: 0 2px 8px color-mix(in srgb, var(--orange) 20%, transparent), 0 1px 3px color-mix(in srgb, var(--orange) 20%, transparent);
}

.topic-card.REPEAT:hover {
    /* border-color: color-mix(in srgb, var(--orange) 65%, transparent); */
    box-shadow: 0 6px 20px color-mix(in srgb, var(--orange) 30%, transparent), 0 2px 6px color-mix(in srgb, var(--orange) 30%, transparent);
}

.topic-card.KNOWN {
    /* border-color: color-mix(in srgb, var(--blue) 35%, transparent); */
    background: linear-gradient(145deg, color-mix(in srgb, var(--blue) 12%, transparent), color-mix(in srgb, var(--blue) 4%, transparent));
    box-shadow: 0 2px 8px color-mix(in srgb, var(--blue) 20%, transparent), 0 1px 3px color-mix(in srgb, var(--blue) 20%, transparent);
}

.topic-card.KNOWN:hover {
    /* border-color: color-mix(in srgb, var(--blue) 65%, transparent); */
    box-shadow: 0 6px 20px color-mix(in srgb, var(--blue) 30%, transparent), 0 2px 6px color-mix(in srgb, var(--blue) 30%, transparent);
}

.topic-card.NOT_STARTED {
    /* border-color: var(--border-color); */
    background: var(--bg-secondary);
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.06);
}

.topic-card.NOT_STARTED:hover {
    /* border-color: color-mix(in srgb, var(--gray) 50%, transparent); */
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
}

.topic-header {
    display: flex;
    justify-content: space-between;
    align-items: start;
    margin-bottom: 8px;
}

.topic-level {
    font-size: 10.5px;
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--text-tertiary);
    opacity: 0.85;
}

.topic-card.DONE .topic-level { color: var(--green); }
.topic-card.REPEAT .topic-level { color: var(--orange); }
.topic-card.KNOWN .topic-level { color: var(--blue); }

.topic-status {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    flex-shrink: 0;
}

.topic-status.DONE {
    background: var(--green);
}

.topic-status.REPEAT {
    background: var(--orange);
}

.topic-status.KNOWN {
    background: var(--blue);
}

.topic-status.NOT_STARTED {
    background: var(--gray);
}

.topic-name {
    font-family: var(--font-serif-body);
    font-size: 14.5px;
    font-weight: 500;
    line-height: 1.35;
    margin-bottom: 0;
    flex: 1;
    color: var(--text-primary);
}

.topic-actions {
    display: flex;
    gap: 6px;
    margin-top: 14px;
}

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

/* ========== MATERIAL CARDS ========== */
.material-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
    cursor: pointer;
    transition: all 0.2s;
    position: relative;
    min-height: 160px;
    display: flex;
    flex-direction: column;
}

.material-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.3);
    border-color: var(--accent-primary);
}

.material-header {
    display: flex;
    justify-content: flex-end;
    align-items: start;
    margin-bottom: 12px;
}

.material-name {
    font-size: 18px;
    font-weight: 600;
    flex: 1;
    margin-bottom: 12px;
}

.material-actions {
    display: flex;
    gap: 4px;
    opacity: 0;
    transition: opacity 0.2s;
}

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

/* ========== TAGS ========== */
.material-tags,
.material-tags-display {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: auto;
}

.material-tags-display {
    gap: 8px;
    margin-bottom: 20px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
}

.material-tag,
.selected-tag {
    padding: 4px 10px;
    background: var(--bg-tertiary);
    border-radius: 4px;
    font-size: 12px;
    color: var(--text-secondary);
}

.selected-tag {
    background: var(--accent);
    color: white;
    display: flex;
    align-items: center;
    gap: 6px;
}

.selected-tag button {
    background: transparent;
    border: none;
    color: white;
    cursor: pointer;
    font-size: 16px;
    line-height: 1;
    padding: 0;
}

.material-tag.level {
    color: white;
    font-weight: 500;
}

.material-tag.level-beginner {
    background: #8b5cf6;
}

.material-tag.level-elementary {
    background: #d94a4a;
}

.material-tag.level-pre-intermediate {
    background: #4580ff;
}

.material-tag.level-intermediate {
    background: #59b165;
}

.material-tag.level-upper-intermediate {
    background: #ff8c00;
}

.material-tag.level-advanced {
    background: #08e6ffb7;
}

.material-tag.difficulty-easy {
    background: var(--success);
    color: var(--bg-primary);
}

.material-tag.difficulty-medium {
    background: var(--accent-warning);
    color: var(--bg-primary);
}

.material-tag.difficulty-hard {
    background: var(--accent-danger);
    color: white;
}

.material-tag.clickable {
    cursor: pointer;
    transition: all 0.2s;
}

.material-tag.clickable:hover {
    background: var(--accent-primary);
    color: white;
    transform: scale(1.05);
}

/* ========== STATS CARDS ========== */
.stats-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 5px;
    padding: 10px;
}

.stat-card {
    background: var(--bg-tertiary);
    padding: 10px;
    border-radius: 8px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s;
    border: 2px solid transparent;
}

.stat-card:hover {
    transform: translateY(-2px);
    background: var(--bg-hover);
}

.stat-card.active {
    border-color: var(--accent-primary);
    background: var(--bg-hover);
    box-shadow: 0 0 0 1px var(--accent-primary);
}

.stat-card.active.DONE {
    border-color: var(--green);
    box-shadow: 0 0 0 1px var(--green);
}

.stat-card.active.REPEAT {
    border-color: var(--orange);
    box-shadow: 0 0 0 1px var(--orange);
}

.stat-card.active.KNOWN {
    border-color: var(--blue);
    box-shadow: 0 0 0 1px var(--blue);
}

.stat-card.active.NOT_STARTED {
    border-color: var(--gray);
    box-shadow: 0 0 0 1px var(--gray);
}

.stat-value {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 4px;
}

.stat-value.DONE {
    color: var(--green);
}

.stat-value.REPEAT {
    color: var(--orange);
}

.stat-value.KNOWN {
    color: var(--blue);
}

.stat-value.NOT_STARTED {
    color: var(--gray);
}

.stat-label {
    font-size: 11px;
    color: var(--text-secondary);
    text-transform: uppercase;
}

/* ========== MENU VISIBILITY ========== */
.student-tile:hover .menu-btn,
.chat-item:hover .menu-btn,
.project-item:hover .menu-btn {
    opacity: 1;
}