/* =========================================
   COMPONENTS - BUTTONS
   ========================================= */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.625rem 1.25rem;
    border-radius: var(--radius-lg);
    font-size: var(--text-sm);
    font-weight: var(--weight-medium);
    line-height: 1;
    border: 1px solid transparent;
    cursor: pointer;
    transition: var(--transition-fast);
    gap: var(--spacing-2);
    white-space: nowrap;
}

.btn:focus {
    outline: none;
    box-shadow: 0 0 0 2px var(--color-surface), 0 0 0 4px var(--color-primary);
}

.btn-primary {
    background-color: var(--color-primary);
    color: white;
    border: 1px solid var(--color-primary);
}

.btn-primary:hover:not(:disabled) {
    background-color: var(--color-primary-hover);  /* Используем переменную hover */
    border-color: var(--color-primary-hover);
    box-shadow: var(--shadow-md);  /* Увеличиваем тень при ховере */
}

.btn-primary:active:not(:disabled) {
    transform: translateY(0);  /* Возвращаем при нажатии */
    box-shadow: var(--shadow-sm);
}

.btn-secondary {
    background-color: transparent;
    color: var(--color-text-secondary);
    border: 1px solid var(--color-border);
}

.btn-secondary:hover:not(:disabled) {
    background-color: var(--color-background);
    border-color: var(--color-text-tertiary);
}

.btn-sm {
    padding: 0.375rem 0.75rem;
    font-size: var(--text-xs);
}

.btn-lg {
    padding: 0.75rem 1.5rem;
    font-size: var(--text-base);
}

/* =========================================
   COMPONENTS - FORM ELEMENTS
   ========================================= */
.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-2);
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-4);
}

.form-label {
    display: flex;
    font-size: var(--text-sm);
    font-weight: var(--weight-medium);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-1);
    align-items: center;
    justify-content: left;
}

.required-star {
    color: var(--color-error);
    margin-left: 2px;
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    height: 44px;
    padding: 0 var(--spacing-3);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    background-color: var(--color-surface);
    color: var(--color-text-primary);
    font-size: var(--text-sm);
    transition: var(--transition-fast);
    outline: none;
}

.form-textarea {
    height: auto;
    min-height: 100px;
    padding: var(--spacing-3);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-light);
}

.form-input-with-icon {
    padding-left: 2.75rem;
}

.form-input-with-right-icon {
    padding-right: 2.75rem;
}

.input-with-icon {
    position: relative;
}

.input-icon {
    position: absolute;
    left: var(--spacing-3);
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-text-tertiary);
    pointer-events: none;
}

.input-right-icon {
    position: absolute;
    right: var(--spacing-3);
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-text-tertiary);
    pointer-events: none;
}

/* =========================================
   COMPONENTS - CARDS
   ========================================= */
.card {
    background-color: var(--color-surface);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
}

.card-header {
    padding: var(--spacing-4) var(--spacing-6);
    border-bottom: 1px solid var(--color-border);
}

.card-body {
    padding: var(--spacing-6);
}

.card-footer {
    padding: var(--spacing-4) var(--spacing-6);
    border-top: 1px solid var(--color-border);
}

/* =========================================
   COMPONENTS - HEADER (fixed, всегда вместе с сайдбаром)
   ========================================= */
.main-header {
    height: var(--header-height);
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--spacing-8);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    width: 100%;
    z-index: calc(var(--z-fixed) + 1);
    box-sizing: border-box;
}

.dark .main-header {
    background-color: rgba(26, 31, 54, 0.95);
}

.header-left {
    display: flex;
    align-items: center;
    gap: var(--spacing-4);
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--color-text-tertiary);
    cursor: pointer;
    transition: var(--transition-fast);
}

.mobile-menu-btn:hover {
    color: var(--color-primary);
}

.header-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-4);
}

/* =========================================
   COMPONENTS - HEADER LOGO
   ========================================= */
.header-logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-3);
    height: var(--header-height);
    width: auto;
}

.header-icon {
    width: 28px;
    height: 28px;
}

.header-logo-img {
    height: 32px;
    width: auto;
}

/* =========================================
   COMPONENTS - SIDEBAR NAVIGATION ITEMS (переиспользуемые)
   ========================================= */
.nav-section {
    margin-bottom: var(--spacing-6);
}

.nav-section-title {
    padding: 0 var(--spacing-2);
    margin-bottom: var(--spacing-2);
    font-size: var(--text-xs);
    font-weight: var(--weight-semibold);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-tertiary);
}

.nav-item {
    display: flex;
    align-items: center;
    padding: 0.625rem var(--spacing-2);
    margin-bottom: 2px;
    font-size: var(--text-sm);
    font-weight: var(--weight-medium);
    color: var(--color-text-secondary);
    border-radius: var(--radius-lg);
    transition: var(--transition-fast);
    text-decoration: none;
}

.nav-item:hover,
.nav-item.active {
    background-color: var(--color-primary-light);
    color: var(--color-primary);
}

.nav-icon {
    font-size: 1.25rem;
    margin-right: var(--spacing-2);
    color: var(--color-text-tertiary);
    transition: var(--transition-fast);
}

.nav-item:hover {
    color: var(--color-primary-hover);
}

.nav-icon,
.nav-item.active .nav-icon {
    color: var(--color-primary);
}

/* =========================================
   COMPONENTS - USER PROFILE

 */
.user-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    padding: var(--spacing-2);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: var(--transition-fast);
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    object-fit: cover;
    border: 2px solid var(--color-border);
    flex-shrink: 0;
}

.user-details {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
    line-height: 1.1;
}

.user-name {
    font-size: var(--text-sm);
    font-weight: var(--weight-semibold);
    color: var(--color-text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-bottom: 2px;
}

.user-role {
    font-size: var(--text-xs);
    color: var(--color-text-tertiary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin: 0;
}

.logout-icon {
    color: var(--color-text-tertiary);
    font-size: 1.25rem;
    transition: var(--transition-fast);
    padding: 4px;
}

.logout-icon:hover {
    color: var(--color-primary);
}

/* =========================================
   GLOBAL FIXES FOR FIXED HEADER
   ========================================= */
body {
    padding-top: var(--header-height); /* Чтобы контент не прятался под фиксированный хедер */
}

/* =========================================
   HEADER - LOGOUT BUTTON
   ========================================= */
.header-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
}

.logout-button-header {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    color: var(--color-text-tertiary);
    background-color: transparent;
    transition: var(--transition-fast);
    text-decoration: none;
}

.logout-button-header:hover {
    background-color: rgba(239, 68, 68, 0.1);
    color: var(--color-error);
    transform: scale(1.05);
}

.logout-button-header .material-icons {
    font-size: 1.5rem;
}

.admin-button-header {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    color: var(--color-text-tertiary);
    background-color: transparent;
    transition: var(--transition-fast);
    text-decoration: none;
}

.admin-button-header:hover {
    background-color: rgba(245, 158, 11, 0.1);
    color: var(--color-warning);
    transform: scale(1.05);
}

.admin-button-header .material-icons {
    font-size: 1.5rem;
}

.mentor-button-header .material-icons {
    font-size: 1.5rem;
}

.mentor-button-header {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    color: var(--color-text-tertiary);
    background-color: transparent;
    transition: var(--transition-fast);
    text-decoration: none;
}

.mentor-button-header:hover {
    background-color: var(--color-primary-light);
    color: var(--color-primary);
    transform: scale(1.05);
}