/* ==========================================================================
   COMPONENTS.CSS - Full Component Library
   University Portal (Dogus University)
   Cards, buttons, tables, forms, modals, toasts, tabs, and more.
   ========================================================================== */


/* ======================================================================
   CARDS
   ====================================================================== */

.du-card {
    background-color: var(--du-bg-card);
    border: 1px solid var(--du-border-color);
    border-radius: var(--du-radius-lg);
    box-shadow: var(--du-shadow-sm);
    overflow: hidden;
    transition: box-shadow var(--du-transition-fast),
                border-color var(--du-transition-fast);
}

.du-card:hover {
    box-shadow: var(--du-shadow-md);
}

.du-card__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--du-space-5) var(--du-space-6);
    border-bottom: 1px solid var(--du-border-color);
}

.du-card__title {
    font-size: var(--du-text-md);
    font-weight: var(--du-weight-semibold);
    color: var(--du-text-primary);
}

.du-card__subtitle {
    font-size: var(--du-text-sm);
    color: var(--du-text-secondary);
    margin-top: var(--du-space-1);
}

.du-card__actions {
    display: flex;
    align-items: center;
    gap: var(--du-space-2);
}

.du-card__body {
    padding: var(--du-space-6);
}

.du-card__body--compact {
    padding: var(--du-space-4);
}

.du-card__footer {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: var(--du-space-3);
    padding: var(--du-space-4) var(--du-space-6);
    border-top: 1px solid var(--du-border-color);
    background-color: var(--du-bg-page);
}

/* Stat card variant */
.du-card--stat {
    padding: var(--du-space-5) var(--du-space-6);
    display: flex;
    align-items: flex-start;
    gap: var(--du-space-4);
}

.du-card--stat:hover {
    box-shadow: var(--du-shadow-md);
}

.du-card--stat .du-card__icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    border-radius: var(--du-radius-lg);
    font-size: var(--du-text-xl);
    flex-shrink: 0;
}

.du-card--stat .du-card__icon--primary {
    background-color: var(--du-primary-subtle);
    color: var(--du-primary);
}

.du-card--stat .du-card__icon--success {
    background-color: var(--du-success-light);
    color: var(--du-success);
}

.du-card--stat .du-card__icon--warning {
    background-color: var(--du-warning-light);
    color: var(--du-warning);
}

.du-card--stat .du-card__icon--info {
    background-color: var(--du-info-light);
    color: var(--du-info);
}

.du-card--stat .du-card__icon--danger {
    background-color: var(--du-danger-light);
    color: var(--du-danger);
}

.du-card--stat .du-card__info {
    flex: 1;
    min-width: 0;
}

.du-card--stat .du-card__value {
    font-size: var(--du-text-2xl);
    font-weight: var(--du-weight-bold);
    color: var(--du-text-primary);
    line-height: var(--du-leading-tight);
}

.du-card--stat .du-card__label {
    font-size: var(--du-text-sm);
    color: var(--du-text-secondary);
    margin-top: var(--du-space-1);
}

.du-card--stat .du-card__trend {
    font-size: var(--du-text-xs);
    font-weight: var(--du-weight-medium);
    margin-top: var(--du-space-1);
}

.du-card--stat .du-card__trend--up {
    color: var(--du-success);
}

.du-card--stat .du-card__trend--down {
    color: var(--du-danger);
}

/* Module card variant */
.du-card--module {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: var(--du-space-6);
    cursor: pointer;
    transition: transform var(--du-transition-fast),
                box-shadow var(--du-transition-fast);
}

.du-card--module:hover {
    transform: translateY(-2px);
    box-shadow: var(--du-shadow-lg);
}

.du-card--module .du-card__module-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 56px;
    height: 56px;
    border-radius: var(--du-radius-xl);
    font-size: var(--du-text-2xl);
    margin-bottom: var(--du-space-3);
}

.du-card--module .du-card__module-name {
    font-size: var(--du-text-sm);
    font-weight: var(--du-weight-semibold);
    color: var(--du-text-primary);
}

.du-card--module .du-card__module-desc {
    font-size: var(--du-text-xs);
    color: var(--du-text-muted);
    margin-top: var(--du-space-1);
}

/* Module icon color variants */
.du-card__module-icon--obs {
    background-color: var(--du-mod-obs-light);
    color: var(--du-mod-obs);
}

.du-card__module-icon--online {
    background-color: var(--du-mod-online-light);
    color: var(--du-mod-online);
}

.du-card__module-icon--pos {
    background-color: var(--du-mod-pos-light);
    color: var(--du-mod-pos);
}

.du-card__module-icon--mail {
    background-color: var(--du-mod-mail-light);
    color: var(--du-mod-mail);
}

.du-card__module-icon--announcements {
    background-color: var(--du-mod-announce-light);
    color: var(--du-mod-announce);
}

.du-card__module-icon--campus {
    background-color: var(--du-mod-campus-light);
    color: var(--du-mod-campus);
}

.du-card__module-icon--support {
    background-color: var(--du-mod-support-light);
    color: var(--du-mod-support);
}


/* ======================================================================
   BUTTONS
   ====================================================================== */

.du-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--du-space-2);
    padding: var(--du-space-2) var(--du-space-5);
    font-size: var(--du-text-sm);
    font-weight: var(--du-weight-medium);
    line-height: var(--du-leading-normal);
    border: 1px solid transparent;
    border-radius: var(--du-radius-md);
    cursor: pointer;
    white-space: nowrap;
    text-decoration: none;
    transition: background-color var(--du-transition-fast),
                border-color var(--du-transition-fast),
                color var(--du-transition-fast),
                box-shadow var(--du-transition-fast);
    user-select: none;
}

.du-btn:focus-visible {
    outline: none;
    box-shadow: var(--du-focus-ring);
}

.du-btn:disabled,
.du-btn--disabled {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

/* Primary */
.du-btn--primary {
    background-color: var(--du-primary);
    border-color: var(--du-primary);
    color: var(--du-text-on-primary);
}

.du-btn--primary:hover {
    background-color: var(--du-primary-dark);
    border-color: var(--du-primary-dark);
}

.du-btn--primary:active {
    background-color: var(--du-primary-dark);
    box-shadow: var(--du-shadow-inner);
}

/* Secondary */
.du-btn--secondary {
    background-color: var(--du-bg-page);
    border-color: var(--du-border-color);
    color: var(--du-text-primary);
}

.du-btn--secondary:hover {
    background-color: var(--du-bg-hover);
    border-color: var(--du-border-dark);
}

/* Success */
.du-btn--success {
    background-color: var(--du-success);
    border-color: var(--du-success);
    color: #FFFFFF;
}

.du-btn--success:hover {
    background-color: var(--du-success-dark);
    border-color: var(--du-success-dark);
}

/* Danger */
.du-btn--danger {
    background-color: var(--du-danger);
    border-color: var(--du-danger);
    color: #FFFFFF;
}

.du-btn--danger:hover {
    background-color: var(--du-danger-dark);
    border-color: var(--du-danger-dark);
}

/* Outline */
.du-btn--outline {
    background-color: transparent;
    border-color: var(--du-primary);
    color: var(--du-primary);
}

.du-btn--outline:hover {
    background-color: var(--du-primary-subtle);
}

/* Ghost */
.du-btn--ghost {
    background-color: transparent;
    border-color: transparent;
    color: var(--du-text-secondary);
}

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

/* Size variants */
.du-btn--sm {
    padding: var(--du-space-1) var(--du-space-3);
    font-size: var(--du-text-xs);
    border-radius: var(--du-radius-sm);
}

.du-btn--lg {
    padding: var(--du-space-3) var(--du-space-8);
    font-size: var(--du-text-md);
    border-radius: var(--du-radius-md);
}

/* Block */
.du-btn--block {
    display: flex;
    width: 100%;
}

/* Icon-only button */
.du-btn--icon {
    padding: var(--du-space-2);
    width: 36px;
    height: 36px;
}

.du-btn--icon.du-btn--sm {
    width: 28px;
    height: 28px;
    padding: var(--du-space-1);
}

.du-btn--icon.du-btn--lg {
    width: 44px;
    height: 44px;
    padding: var(--du-space-2);
}

/* Button group */
.du-btn-group {
    display: inline-flex;
}

.du-btn-group .du-btn {
    border-radius: 0;
}

.du-btn-group .du-btn:first-child {
    border-radius: var(--du-radius-md) 0 0 var(--du-radius-md);
}

.du-btn-group .du-btn:last-child {
    border-radius: 0 var(--du-radius-md) var(--du-radius-md) 0;
}

.du-btn-group .du-btn + .du-btn {
    margin-left: -1px;
}

/* Loading state */
.du-btn--loading {
    position: relative;
    color: transparent !important;
    pointer-events: none;
}

.du-btn--loading::after {
    content: '';
    position: absolute;
    width: 16px;
    height: 16px;
    border: 2px solid currentColor;
    border-right-color: transparent;
    border-radius: var(--du-radius-full);
    animation: du-spin 0.6s linear infinite;
    color: var(--du-text-on-primary);
}

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


/* ======================================================================
   TABLES
   ====================================================================== */

.du-table-wrapper {
    overflow-x: auto;
    border: 1px solid var(--du-border-color);
    border-radius: var(--du-radius-lg);
    background-color: var(--du-bg-card);
}

.du-table {
    width: 100%;
    border-collapse: collapse;
    font-size: var(--du-text-sm);
}

.du-table th {
    padding: var(--du-space-3) var(--du-space-4);
    text-align: left;
    font-size: var(--du-text-xs);
    font-weight: var(--du-weight-semibold);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--du-text-secondary);
    background-color: var(--du-bg-page);
    border-bottom: 1px solid var(--du-border-color);
    white-space: nowrap;
}

.du-table td {
    padding: var(--du-space-3) var(--du-space-4);
    border-bottom: 1px solid var(--du-border-light);
    color: var(--du-text-primary);
    vertical-align: middle;
}

.du-table tbody tr:last-child td {
    border-bottom: none;
}

.du-table tbody tr {
    transition: background-color var(--du-transition-fast);
}

.du-table tbody tr:hover {
    background-color: var(--du-bg-hover);
}

/* Striped variant */
.du-table--striped tbody tr:nth-child(even) {
    background-color: var(--du-bg-page);
}

.du-table--striped tbody tr:nth-child(even):hover {
    background-color: var(--du-bg-hover);
}

/* Compact variant */
.du-table--compact th,
.du-table--compact td {
    padding: var(--du-space-2) var(--du-space-3);
}

/* Sortable header */
.du-table__sort {
    cursor: pointer;
    user-select: none;
}

.du-table__sort:hover {
    color: var(--du-primary);
}

.du-table__sort-icon {
    display: inline-block;
    margin-left: var(--du-space-1);
    opacity: 0.4;
}

.du-table__sort--active .du-table__sort-icon {
    opacity: 1;
    color: var(--du-primary);
}


/* ======================================================================
   FORMS
   ====================================================================== */

.du-form-group {
    margin-bottom: var(--du-space-5);
}

.du-form-label {
    display: block;
    margin-bottom: var(--du-space-2);
    font-size: var(--du-text-sm);
    font-weight: var(--du-weight-medium);
    color: var(--du-text-primary);
}

.du-form-label--required::after {
    content: ' *';
    color: var(--du-danger);
}

.du-form-control,
.du-input {
    display: block;
    width: 100%;
    padding: var(--du-space-2) var(--du-space-3);
    font-size: var(--du-text-sm);
    font-family: var(--du-font-family);
    color: var(--du-text-primary);
    background-color: var(--du-bg-input);
    border: 1px solid var(--du-border-color);
    border-radius: var(--du-radius-md);
    transition: border-color var(--du-transition-fast),
                box-shadow var(--du-transition-fast);
    appearance: none;
}

.du-form-control::placeholder {
    color: var(--du-text-muted);
}

.du-form-control:focus {
    outline: none;
    border-color: var(--du-primary);
    box-shadow: var(--du-focus-ring);
}

.du-form-control:disabled {
    background-color: var(--du-bg-page);
    opacity: 0.6;
    cursor: not-allowed;
}

/* Error state */
.du-form-control--error {
    border-color: var(--du-danger);
}

.du-form-control--error:focus {
    box-shadow: 0 0 0 3px rgba(204, 51, 51, 0.25);
}

/* Success state */
.du-form-control--success {
    border-color: var(--du-success);
}

/* Select */
.du-form-select {
    display: block;
    width: 100%;
    padding: var(--du-space-2) var(--du-space-8) var(--du-space-2) var(--du-space-3);
    font-size: var(--du-text-sm);
    color: var(--du-text-primary);
    background-color: var(--du-bg-input);
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%236B7280' d='M3 5l3 3 3-3'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right var(--du-space-3) center;
    background-size: 12px;
    border: 1px solid var(--du-border-color);
    border-radius: var(--du-radius-md);
    cursor: pointer;
    appearance: none;
    transition: border-color var(--du-transition-fast),
                box-shadow var(--du-transition-fast);
}

.du-form-select:focus {
    outline: none;
    border-color: var(--du-primary);
    box-shadow: var(--du-focus-ring);
}

/* Textarea */
.du-form-textarea {
    display: block;
    width: 100%;
    min-height: 100px;
    padding: var(--du-space-3);
    font-size: var(--du-text-sm);
    color: var(--du-text-primary);
    background-color: var(--du-bg-input);
    border: 1px solid var(--du-border-color);
    border-radius: var(--du-radius-md);
    resize: vertical;
    transition: border-color var(--du-transition-fast),
                box-shadow var(--du-transition-fast);
}

.du-form-textarea:focus {
    outline: none;
    border-color: var(--du-primary);
    box-shadow: var(--du-focus-ring);
}

/* Checkbox / Radio */
.du-form-check {
    display: flex;
    align-items: center;
    gap: var(--du-space-2);
    padding: var(--du-space-1) 0;
    cursor: pointer;
}

.du-form-check__input {
    width: 18px;
    height: 18px;
    border: 2px solid var(--du-border-color);
    border-radius: var(--du-radius-sm);
    appearance: none;
    cursor: pointer;
    transition: background-color var(--du-transition-fast),
                border-color var(--du-transition-fast);
    flex-shrink: 0;
    position: relative;
}

.du-form-check__input[type="radio"] {
    border-radius: var(--du-radius-full);
}

.du-form-check__input:checked {
    background-color: var(--du-primary);
    border-color: var(--du-primary);
}

.du-form-check__input:checked::after {
    content: '';
    position: absolute;
    top: 2px;
    left: 5px;
    width: 4px;
    height: 8px;
    border: solid #FFFFFF;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

.du-form-check__input[type="radio"]:checked::after {
    top: 3px;
    left: 3px;
    width: 8px;
    height: 8px;
    border: none;
    border-radius: var(--du-radius-full);
    background-color: #FFFFFF;
    transform: none;
}

.du-form-check__input:focus-visible {
    box-shadow: var(--du-focus-ring);
}

.du-form-check__label {
    font-size: var(--du-text-sm);
    color: var(--du-text-primary);
    user-select: none;
}

/* Form error message */
.du-form-error {
    display: block;
    margin-top: var(--du-space-1);
    font-size: var(--du-text-xs);
    color: var(--du-danger);
}

/* Form hint */
.du-form-hint {
    display: block;
    margin-top: var(--du-space-1);
    font-size: var(--du-text-xs);
    color: var(--du-text-muted);
}

/* Input group (icon + input) */
.du-input-group {
    position: relative;
    display: flex;
    align-items: stretch;
}

.du-input-group__icon {
    position: absolute;
    left: var(--du-space-3);
    top: 50%;
    transform: translateY(-50%);
    color: var(--du-text-muted);
    pointer-events: none;
    z-index: 1;
}

.du-input-group .du-form-control {
    padding-left: var(--du-space-9);
}

.du-input-group__append {
    display: flex;
    align-items: center;
    padding: 0 var(--du-space-3);
    background-color: var(--du-bg-page);
    border: 1px solid var(--du-border-color);
    border-left: none;
    border-radius: 0 var(--du-radius-md) var(--du-radius-md) 0;
    font-size: var(--du-text-sm);
    color: var(--du-text-secondary);
}

.du-input-group__append + .du-form-control,
.du-input-group .du-form-control:not(:last-child) {
    border-radius: var(--du-radius-md) 0 0 var(--du-radius-md);
}


/* ======================================================================
   BADGES
   ====================================================================== */

.du-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--du-space-1);
    padding: 2px var(--du-space-2);
    font-size: var(--du-text-xs);
    font-weight: var(--du-weight-semibold);
    line-height: var(--du-leading-normal);
    border-radius: var(--du-radius-full);
    white-space: nowrap;
}

.du-badge--primary {
    background-color: var(--du-primary-subtle);
    color: var(--du-primary);
}

.du-badge--success {
    background-color: var(--du-success-light);
    color: var(--du-success-dark);
}

.du-badge--warning {
    background-color: var(--du-warning-light);
    color: var(--du-warning-dark);
}

.du-badge--danger {
    background-color: var(--du-danger-light);
    color: var(--du-danger-dark);
}

.du-badge--info {
    background-color: var(--du-info-light);
    color: var(--du-info-dark);
}

/* Outline variants */
.du-badge--outline {
    background-color: transparent;
    border: 1px solid currentColor;
}

.du-badge--outline.du-badge--primary {
    color: var(--du-primary);
}

.du-badge--outline.du-badge--success {
    color: var(--du-success);
}

.du-badge--outline.du-badge--warning {
    color: var(--du-warning);
}

.du-badge--outline.du-badge--danger {
    color: var(--du-danger);
}

.du-badge--outline.du-badge--info {
    color: var(--du-info);
}

/* Dot badge */
.du-badge__dot {
    width: 6px;
    height: 6px;
    border-radius: var(--du-radius-full);
    background-color: currentColor;
}


/* ======================================================================
   MODALS
   ====================================================================== */

.du-modal {
    display: none;
    position: fixed;
    inset: 0;
    z-index: var(--du-z-modal);
    align-items: center;
    justify-content: center;
    padding: var(--du-space-4);
}

.du-modal--active {
    display: flex;
}

.du-modal__overlay {
    position: fixed;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.5);
    animation: du-fade-in var(--du-transition-base);
}

.du-modal__content {
    position: relative;
    z-index: 1;
    width: 100%;
    max-width: 520px;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    background-color: var(--du-bg-card);
    border-radius: var(--du-radius-xl);
    box-shadow: var(--du-shadow-xl);
    animation: du-slide-up var(--du-transition-normal);
}

.du-modal__content--sm {
    max-width: 400px;
}

.du-modal__content--lg {
    max-width: 720px;
}

.du-modal__content--xl {
    max-width: 960px;
}

.du-modal__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--du-space-5) var(--du-space-6);
    border-bottom: 1px solid var(--du-border-color);
    flex-shrink: 0;
}

.du-modal__title {
    font-size: var(--du-text-lg);
    font-weight: var(--du-weight-semibold);
    color: var(--du-text-primary);
}

.du-modal__close {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: var(--du-radius-md);
    color: var(--du-text-muted);
    cursor: pointer;
    transition: background-color var(--du-transition-fast),
                color var(--du-transition-fast);
}

.du-modal__close:hover {
    background-color: var(--du-bg-hover);
    color: var(--du-text-primary);
}

.du-modal__body {
    padding: var(--du-space-6);
    overflow-y: auto;
    flex: 1;
}

.du-modal__footer {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: var(--du-space-3);
    padding: var(--du-space-4) var(--du-space-6);
    border-top: 1px solid var(--du-border-color);
    flex-shrink: 0;
}

@keyframes du-fade-in {
    from { opacity: 0; }
    to   { opacity: 1; }
}

@keyframes du-slide-up {
    from {
        opacity: 0;
        transform: translateY(16px) scale(0.98);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}


/* ======================================================================
   TOAST NOTIFICATIONS
   ====================================================================== */

.du-toast-container {
    position: fixed;
    top: calc(var(--du-topbar-height) + var(--du-space-4));
    right: var(--du-space-4);
    z-index: var(--du-z-toast);
    display: flex;
    flex-direction: column;
    gap: var(--du-space-3);
    pointer-events: none;
    max-width: 400px;
    width: 100%;
}

.du-toast {
    display: flex;
    align-items: flex-start;
    gap: var(--du-space-3);
    padding: var(--du-space-4);
    background-color: var(--du-bg-card);
    border: 1px solid var(--du-border-color);
    border-radius: var(--du-radius-lg);
    box-shadow: var(--du-shadow-lg);
    pointer-events: auto;
    animation: du-toast-in var(--du-transition-normal);
    border-left: 4px solid var(--du-border-color);
}

.du-toast--hiding {
    animation: du-toast-out var(--du-transition-base) forwards;
}

.du-toast--success {
    border-left-color: var(--du-success);
}

.du-toast--error {
    border-left-color: var(--du-danger);
}

.du-toast--warning {
    border-left-color: var(--du-warning);
}

.du-toast--info {
    border-left-color: var(--du-info);
}

.du-toast__icon {
    flex-shrink: 0;
    width: 20px;
    height: 20px;
    margin-top: 1px;
}

.du-toast--success .du-toast__icon { color: var(--du-success); }
.du-toast--error   .du-toast__icon { color: var(--du-danger);  }
.du-toast--warning .du-toast__icon { color: var(--du-warning); }
.du-toast--info    .du-toast__icon { color: var(--du-info);    }

.du-toast__content {
    flex: 1;
    min-width: 0;
}

.du-toast__title {
    font-size: var(--du-text-sm);
    font-weight: var(--du-weight-semibold);
    color: var(--du-text-primary);
}

.du-toast__message {
    font-size: var(--du-text-sm);
    color: var(--du-text-secondary);
    margin-top: var(--du-space-1);
}

.du-toast__close {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    border-radius: var(--du-radius-sm);
    color: var(--du-text-muted);
    cursor: pointer;
    transition: background-color var(--du-transition-fast),
                color var(--du-transition-fast);
}

.du-toast__close:hover {
    background-color: var(--du-bg-hover);
    color: var(--du-text-primary);
}

@keyframes du-toast-in {
    from {
        opacity: 0;
        transform: translateX(100%);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes du-toast-out {
    from {
        opacity: 1;
        transform: translateX(0);
    }
    to {
        opacity: 0;
        transform: translateX(100%);
    }
}


/* ======================================================================
   TABS
   ====================================================================== */

.du-tabs {
    display: flex;
    border-bottom: 2px solid var(--du-border-color);
    gap: 0;
    overflow-x: auto;
}

.du-tabs__item {
    padding: var(--du-space-3) var(--du-space-5);
    font-size: var(--du-text-sm);
    font-weight: var(--du-weight-medium);
    color: var(--du-text-secondary);
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
    white-space: nowrap;
    cursor: pointer;
    transition: color var(--du-transition-fast),
                border-color var(--du-transition-fast);
}

.du-tabs__item:hover {
    color: var(--du-text-primary);
}

.du-tabs__item--active {
    color: var(--du-primary);
    border-bottom-color: var(--du-primary);
}

.du-tab-content {
    display: none;
    padding: var(--du-space-5) 0;
}

.du-tab-content--active {
    display: block;
}


/* ======================================================================
   AVATARS
   ====================================================================== */

.du-avatar {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--du-radius-full);
    overflow: hidden;
    flex-shrink: 0;
    background-color: var(--du-primary-subtle);
    color: var(--du-primary);
    font-weight: var(--du-weight-semibold);
}

.du-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.du-avatar--sm {
    width: 32px;
    height: 32px;
    font-size: var(--du-text-xs);
}

.du-avatar--md {
    width: 40px;
    height: 40px;
    font-size: var(--du-text-sm);
}

.du-avatar--lg {
    width: 64px;
    height: 64px;
    font-size: var(--du-text-xl);
}

.du-avatar--xl {
    width: 96px;
    height: 96px;
    font-size: var(--du-text-3xl);
}

/* Avatar with online status */
.du-avatar-status {
    position: relative;
    display: inline-flex;
}

.du-avatar-status__indicator {
    position: absolute;
    bottom: 0;
    right: 0;
    width: 12px;
    height: 12px;
    border-radius: var(--du-radius-full);
    border: 2px solid var(--du-bg-card);
}

.du-avatar-status__indicator--online {
    background-color: var(--du-success);
}

.du-avatar-status__indicator--offline {
    background-color: var(--du-text-muted);
}

/* Avatar group */
.du-avatar-group {
    display: flex;
}

.du-avatar-group .du-avatar {
    border: 2px solid var(--du-bg-card);
    margin-left: -8px;
}

.du-avatar-group .du-avatar:first-child {
    margin-left: 0;
}


/* ======================================================================
   EMPTY STATE
   ====================================================================== */

.du-empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--du-space-12) var(--du-space-6);
}

.du-empty__icon {
    font-size: 3rem;
    color: var(--du-text-muted);
    margin-bottom: var(--du-space-4);
    opacity: 0.5;
}

.du-empty__title {
    font-size: var(--du-text-lg);
    font-weight: var(--du-weight-semibold);
    color: var(--du-text-primary);
    margin-bottom: var(--du-space-2);
}

.du-empty__description {
    font-size: var(--du-text-sm);
    color: var(--du-text-secondary);
    max-width: 360px;
    margin-bottom: var(--du-space-6);
}


/* ======================================================================
   ALERTS
   ====================================================================== */

.du-alert {
    display: flex;
    align-items: flex-start;
    gap: var(--du-space-3);
    padding: var(--du-space-4);
    border-radius: var(--du-radius-md);
    font-size: var(--du-text-sm);
    border: 1px solid;
}

.du-alert__icon {
    flex-shrink: 0;
    width: 20px;
    height: 20px;
    margin-top: 1px;
}

.du-alert__content {
    flex: 1;
    min-width: 0;
}

.du-alert__title {
    font-weight: var(--du-weight-semibold);
    margin-bottom: var(--du-space-1);
}

.du-alert--info {
    background-color: var(--du-info-light);
    border-color: var(--du-info);
    color: var(--du-info-dark);
}

.du-alert--success {
    background-color: var(--du-success-light);
    border-color: var(--du-success);
    color: var(--du-success-dark);
}

.du-alert--warning {
    background-color: var(--du-warning-light);
    border-color: var(--du-warning);
    color: var(--du-warning-dark);
}

.du-alert--danger {
    background-color: var(--du-danger-light);
    border-color: var(--du-danger);
    color: var(--du-danger-dark);
}


/* ======================================================================
   DROPDOWN
   ====================================================================== */

.du-dropdown {
    position: relative;
    display: inline-block;
}

.du-dropdown__menu {
    position: absolute;
    top: calc(100% + var(--du-space-1));
    left: 0;
    z-index: var(--du-z-dropdown);
    min-width: 180px;
    padding: var(--du-space-1);
    background-color: var(--du-bg-card);
    border: 1px solid var(--du-border-color);
    border-radius: var(--du-radius-lg);
    box-shadow: var(--du-shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-4px);
    transition: opacity var(--du-transition-fast),
                visibility var(--du-transition-fast),
                transform var(--du-transition-fast);
}

.du-dropdown__menu--right {
    left: auto;
    right: 0;
}

.du-dropdown--open .du-dropdown__menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.du-dropdown__item {
    display: flex;
    align-items: center;
    gap: var(--du-space-2);
    padding: var(--du-space-2) var(--du-space-3);
    font-size: var(--du-text-sm);
    color: var(--du-text-primary);
    border-radius: var(--du-radius-md);
    cursor: pointer;
    transition: background-color var(--du-transition-fast);
    white-space: nowrap;
}

.du-dropdown__item:hover {
    background-color: var(--du-bg-hover);
}

.du-dropdown__item--danger {
    color: var(--du-danger);
}

.du-dropdown__item--danger:hover {
    background-color: var(--du-danger-light);
}

.du-dropdown__divider {
    height: 1px;
    margin: var(--du-space-1) 0;
    background-color: var(--du-border-color);
}

.du-dropdown__label {
    padding: var(--du-space-2) var(--du-space-3) var(--du-space-1);
    font-size: var(--du-text-xs);
    font-weight: var(--du-weight-semibold);
    color: var(--du-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}


/* ======================================================================
   PAGINATION
   ====================================================================== */

.du-pagination {
    display: flex;
    align-items: center;
    gap: var(--du-space-1);
}

.du-pagination__item {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 36px;
    height: 36px;
    padding: 0 var(--du-space-2);
    font-size: var(--du-text-sm);
    font-weight: var(--du-weight-medium);
    color: var(--du-text-secondary);
    border: 1px solid var(--du-border-color);
    border-radius: var(--du-radius-md);
    background-color: var(--du-bg-card);
    cursor: pointer;
    transition: background-color var(--du-transition-fast),
                color var(--du-transition-fast),
                border-color var(--du-transition-fast);
}

.du-pagination__item:hover {
    background-color: var(--du-bg-hover);
    color: var(--du-text-primary);
}

.du-pagination__item--active {
    background-color: var(--du-primary);
    border-color: var(--du-primary);
    color: #FFFFFF;
}

.du-pagination__item--active:hover {
    background-color: var(--du-primary-dark);
    border-color: var(--du-primary-dark);
    color: #FFFFFF;
}

.du-pagination__item--disabled {
    opacity: 0.4;
    cursor: not-allowed;
    pointer-events: none;
}

.du-pagination__ellipsis {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 36px;
    height: 36px;
    color: var(--du-text-muted);
    font-size: var(--du-text-sm);
}


/* ======================================================================
   PROGRESS BAR
   ====================================================================== */

.du-progress {
    width: 100%;
    height: 8px;
    background-color: var(--du-bg-page);
    border-radius: var(--du-radius-full);
    overflow: hidden;
}

.du-progress--sm {
    height: 4px;
}

.du-progress--lg {
    height: 12px;
}

.du-progress__bar {
    height: 100%;
    border-radius: var(--du-radius-full);
    background-color: var(--du-primary);
    transition: width var(--du-transition-slow);
}

.du-progress__bar--success {
    background-color: var(--du-success);
}

.du-progress__bar--warning {
    background-color: var(--du-warning);
}

.du-progress__bar--danger {
    background-color: var(--du-danger);
}

.du-progress__bar--info {
    background-color: var(--du-info);
}

/* Animated striped variant */
.du-progress__bar--striped {
    background-image: linear-gradient(
        45deg,
        rgba(255, 255, 255, 0.15) 25%,
        transparent 25%,
        transparent 50%,
        rgba(255, 255, 255, 0.15) 50%,
        rgba(255, 255, 255, 0.15) 75%,
        transparent 75%,
        transparent
    );
    background-size: 1rem 1rem;
    animation: du-progress-stripes 1s linear infinite;
}

@keyframes du-progress-stripes {
    from { background-position: 1rem 0; }
    to   { background-position: 0 0; }
}


/* ======================================================================
   SKELETON LOADER
   ====================================================================== */

.du-skeleton {
    background-color: var(--du-bg-hover);
    border-radius: var(--du-radius-md);
    position: relative;
    overflow: hidden;
}

.du-skeleton::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.3),
        transparent
    );
    animation: du-skeleton-shimmer 1.5s ease-in-out infinite;
}

[data-theme="dark"] .du-skeleton::after {
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.05),
        transparent
    );
}

.du-skeleton--text {
    height: 14px;
    margin-bottom: var(--du-space-2);
    width: 100%;
}

.du-skeleton--text:last-child {
    width: 70%;
}

.du-skeleton--circle {
    border-radius: var(--du-radius-full);
}

.du-skeleton--rect {
    border-radius: var(--du-radius-lg);
}

@keyframes du-skeleton-shimmer {
    0%   { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}


/* ======================================================================
   DIVIDER
   ====================================================================== */

.du-divider {
    height: 1px;
    background-color: var(--du-border-color);
    margin: var(--du-space-4) 0;
    border: none;
}

.du-divider--lg {
    margin: var(--du-space-8) 0;
}


/* ======================================================================
   TOOLTIP (CSS only, basic)
   ====================================================================== */

[data-tooltip] {
    position: relative;
}

[data-tooltip]::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: calc(100% + 6px);
    left: 50%;
    transform: translateX(-50%);
    padding: var(--du-space-1) var(--du-space-2);
    font-size: var(--du-text-xs);
    font-weight: var(--du-weight-medium);
    color: #FFFFFF;
    background-color: var(--du-text-primary);
    border-radius: var(--du-radius-sm);
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    z-index: var(--du-z-tooltip);
    transition: opacity var(--du-transition-fast),
                visibility var(--du-transition-fast);
}

[data-tooltip]:hover::after {
    opacity: 1;
    visibility: visible;
}


/* ======================================================================
   DASHBOARD COMPONENTS
   ====================================================================== */

/* Stats grid */
.du-stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--du-space-4);
    margin-bottom: var(--du-space-6);
}

/* Stat card */
.du-stat-card {
    background-color: var(--du-bg-card);
    border: 1px solid var(--du-border-color);
    border-radius: var(--du-radius-lg);
    padding: var(--du-space-5);
    display: flex;
    align-items: center;
    gap: var(--du-space-4);
    transition: box-shadow var(--du-transition-fast);
}

.du-stat-card:hover {
    box-shadow: var(--du-shadow-md);
}

.du-stat-card__icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    border-radius: var(--du-radius-lg);
    flex-shrink: 0;
}

.du-stat-card__content {
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.du-stat-card__value {
    font-size: var(--du-text-xl);
    font-weight: var(--du-weight-bold);
    color: var(--du-text-primary);
    line-height: var(--du-leading-tight);
}

.du-stat-card__label {
    font-size: var(--du-text-xs);
    color: var(--du-text-muted);
    margin-top: var(--du-space-1);
}

/* Welcome banner */
.du-welcome-banner {
    background: linear-gradient(135deg, var(--du-primary), var(--du-primary-dark));
    color: #FFFFFF;
    border-radius: var(--du-radius-lg);
    padding: var(--du-space-6) var(--du-space-8);
    margin-bottom: var(--du-space-6);
}

.du-welcome-banner__title {
    font-size: var(--du-text-2xl);
    font-weight: var(--du-weight-bold);
    margin-bottom: var(--du-space-2);
}

.du-welcome-banner__subtitle {
    font-size: var(--du-text-sm);
    opacity: 0.85;
}

/* Schedule list */
.du-schedule-list {
    display: flex;
    flex-direction: column;
    gap: var(--du-space-3);
}

.du-schedule-item {
    display: flex;
    align-items: flex-start;
    gap: var(--du-space-4);
    padding: var(--du-space-3) 0;
    border-bottom: 1px solid var(--du-border-light);
}

.du-schedule-item:last-child {
    border-bottom: none;
}

.du-schedule-item__time {
    display: flex;
    flex-direction: column;
    align-items: center;
    min-width: 50px;
    flex-shrink: 0;
}

.du-schedule-item__start {
    font-size: var(--du-text-sm);
    font-weight: var(--du-weight-semibold);
    color: var(--du-text-primary);
}

.du-schedule-item__end {
    font-size: var(--du-text-xs);
    color: var(--du-text-muted);
}

.du-schedule-item__divider {
    width: 3px;
    min-height: 40px;
    background: var(--du-primary);
    border-radius: var(--du-radius-full);
    flex-shrink: 0;
}

.du-schedule-item__info {
    display: flex;
    flex-direction: column;
    gap: var(--du-space-1);
    min-width: 0;
}

.du-schedule-item__code {
    font-size: var(--du-text-xs);
    font-weight: var(--du-weight-semibold);
    color: var(--du-primary);
    text-transform: uppercase;
}

.du-schedule-item__name {
    font-size: var(--du-text-sm);
    font-weight: var(--du-weight-medium);
    color: var(--du-text-primary);
}

.du-schedule-item__meta {
    font-size: var(--du-text-xs);
    color: var(--du-text-muted);
}

/* Progress bar (simple) */
.du-progress-bar {
    width: 100%;
    height: 8px;
    background-color: var(--du-bg-hover);
    border-radius: var(--du-radius-full);
    overflow: hidden;
}

.du-progress-bar__fill {
    height: 100%;
    border-radius: var(--du-radius-full);
    background-color: var(--du-primary);
    transition: width var(--du-transition-slow);
}

/* Progress info */
.du-progress-info__row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: var(--du-text-sm);
    color: var(--du-text-secondary);
    margin-bottom: var(--du-space-2);
}

/* Empty state */
.du-empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--du-space-8) var(--du-space-4);
    color: var(--du-text-muted);
}

.du-empty-state--sm {
    padding: var(--du-space-4);
}

.du-empty-state p {
    font-size: var(--du-text-sm);
    margin-bottom: var(--du-space-3);
}

/* Link text */
.du-link {
    font-size: var(--du-text-sm);
    color: var(--du-primary);
    font-weight: var(--du-weight-medium);
    transition: color var(--du-transition-fast);
}

.du-link:hover {
    color: var(--du-primary-dark);
    text-decoration: underline;
}

/* List */
.du-list {
    display: flex;
    flex-direction: column;
}

.du-list__item {
    padding: var(--du-space-3) 0;
    border-bottom: 1px solid var(--du-border-light);
}

.du-list__item:last-child {
    border-bottom: none;
}

.du-list__content {
    display: flex;
    flex-direction: column;
    gap: var(--du-space-1);
}

.du-list__title {
    font-size: var(--du-text-sm);
    font-weight: var(--du-weight-medium);
    color: var(--du-text-primary);
    display: flex;
    align-items: center;
    gap: var(--du-space-2);
    flex-wrap: wrap;
}

.du-list__meta {
    font-size: var(--du-text-xs);
    color: var(--du-text-muted);
    display: flex;
    align-items: center;
    gap: var(--du-space-2);
    flex-wrap: wrap;
}

/* Card title with icon */
.du-card__title {
    display: flex;
    align-items: center;
    gap: var(--du-space-2);
}

/* Select */
.du-select {
    display: block;
    width: 100%;
    padding: var(--du-space-2) var(--du-space-3);
    font-size: var(--du-text-sm);
    font-family: var(--du-font-family);
    color: var(--du-text-primary);
    background-color: var(--du-bg-input);
    border: 1px solid var(--du-border-color);
    border-radius: var(--du-radius-md);
    cursor: pointer;
    transition: border-color var(--du-transition-fast), box-shadow var(--du-transition-fast);
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%236B7280' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right var(--du-space-3) center;
    padding-right: var(--du-space-8);
}

.du-select:focus {
    outline: none;
    border-color: var(--du-primary);
    box-shadow: var(--du-focus-ring);
}

/* Label */
.du-label {
    display: block;
    font-size: var(--du-text-sm);
    font-weight: var(--du-weight-medium);
    color: var(--du-text-primary);
    margin-bottom: var(--du-space-2);
}

/* Textarea */
.du-textarea {
    display: block;
    width: 100%;
    padding: var(--du-space-3);
    font-size: var(--du-text-sm);
    font-family: var(--du-font-family);
    color: var(--du-text-primary);
    background-color: var(--du-bg-input);
    border: 1px solid var(--du-border-color);
    border-radius: var(--du-radius-md);
    resize: vertical;
    min-height: 100px;
    transition: border-color var(--du-transition-fast), box-shadow var(--du-transition-fast);
}

.du-textarea:focus {
    outline: none;
    border-color: var(--du-primary);
    box-shadow: var(--du-focus-ring);
}