/* ============================================= */
/* ADMIN PANEL STYLES — Евгений Вдовин           */
/* ============================================= */

:root {
    --admin-sidebar-width: 260px;
    --admin-header-height: 64px;
    --admin-bg: #f8fafc;
    --admin-sidebar-bg: #1a2b4c;
    --admin-card-bg: #ffffff;
    --admin-border: #e2e8f0;
    --admin-text: #1e293b;
    --admin-text-muted: #64748b;
    --admin-primary: #0082ff;
    --admin-success: #10b981;
    --admin-danger: #ef4444;
    --admin-warning: #f59e0b;
}

/* ============================================= */
/* LOGIN PAGE                                     */
/* ============================================= */

.admin-body {
    font-family: var(--font-body);
    background: linear-gradient(135deg, #1a2b4c 0%, #0f1a2e 100%);
    min-height: 100vh;
    margin: 0;
}

.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
}

.login-card {
    background: var(--admin-card-bg);
    border-radius: 16px;
    padding: 48px 40px;
    width: 100%;
    max-width: 420px;
    box-shadow: 0 24px 48px rgba(0, 0, 0, 0.3);
}

.login-header {
    text-align: center;
    margin-bottom: 32px;
}

.login-logo {
    width: 64px;
    height: 64px;
    margin-bottom: 16px;
    border-radius: 12px;
}

.login-header h1 {
    font-family: var(--font-heading);
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--color-dark);
    margin: 0 0 8px 0;
}

.login-header p {
    color: var(--admin-text-muted);
    font-size: 0.95rem;
    margin: 0;
}

.login-form .form-group {
    margin-bottom: 20px;
}

.login-form label {
    display: block;
    font-weight: 600;
    color: var(--admin-text);
    margin-bottom: 8px;
    font-size: 0.9rem;
}

.login-form input[type="password"],
.login-form input[type="text"],
.login-form input[type="email"],
.login-form input[type="url"] {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--admin-border);
    border-radius: 10px;
    font-size: 1rem;
    font-family: inherit;
    transition: var(--transition);
    box-sizing: border-box;
}

.login-form input:focus {
    outline: none;
    border-color: var(--admin-primary);
    box-shadow: 0 0 0 3px rgba(0, 130, 255, 0.1);
}

.login-form input[type="checkbox"] {
    margin-right: 8px;
}

.login-form label[for="remember"] {
    display: flex;
    align-items: center;
    font-weight: 500;
    color: var(--admin-text-muted);
    cursor: pointer;
}

.btn--full {
    width: 100%;
    padding: 14px 24px;
    font-size: 1rem;
}

.login-error {
    margin-top: 16px;
    padding: 12px;
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid var(--admin-danger);
    border-radius: 8px;
    color: var(--admin-danger);
    font-size: 0.9rem;
    display: none;
}

.login-error.visible {
    display: block;
}

.login-footer {
    margin-top: 24px;
    padding-top: 24px;
    border-top: 1px solid var(--admin-border);
    display: flex;
    justify-content: space-between;
    gap: 16px;
}

.login-footer a {
    color: var(--admin-primary);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transition);
}

.login-footer a:hover {
    color: var(--color-secondary-blue);
}

/* ============================================= */
/* ADMIN PANEL LAYOUT                             */
/* ============================================= */

.admin-panel {
    display: flex;
    min-height: 100vh;
    background: var(--admin-bg);
}

.admin-sidebar {
    width: var(--admin-sidebar-width);
    background: var(--admin-sidebar-bg);
    color: white;
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 100;
}

.admin-sidebar__header {
    padding: 24px 20px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    gap: 12px;
}

.admin-logo {
    width: 40px;
    height: 40px;
    border-radius: 8px;
}

.admin-sidebar__header span {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 1.1rem;
}

.admin-nav {
    flex: 1;
    padding: 16px 0;
}

.admin-nav__link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 20px;
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: var(--transition);
    border-left: 3px solid transparent;
}

.admin-nav__link:hover {
    background: rgba(255, 255, 255, 0.05);
    color: white;
}

.admin-nav__link--active {
    background: rgba(0, 130, 255, 0.2);
    color: white;
    border-left-color: var(--admin-primary);
}

.admin-sidebar__footer {
    padding: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.admin-sidebar__footer .btn--outline {
    border-color: rgba(255, 255, 255, 0.3);
    color: white;
}

.admin-sidebar__footer .btn--outline:hover {
    border-color: rgba(255, 255, 255, 0.6);
    background: rgba(255, 255, 255, 0.1);
}

.admin-content {
    margin-left: var(--admin-sidebar-width);
    flex: 1;
    padding: 32px;
    min-height: 100vh;
}

.admin-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    gap: 16px;
    flex-wrap: wrap;
}

.admin-header h2 {
    font-family: var(--font-heading);
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--color-dark);
    margin: 0;
}

.admin-header .btn--primary {
    background: linear-gradient(135deg, #00E0FF 0%, #0082FF 50%, #0040FF 100%);
    color: white;
    border: none;
}

.admin-header .btn--outline {
    background: transparent;
    color: var(--admin-primary);
    border-color: var(--admin-primary);
}

.admin-header .btn--outline:hover {
    background: var(--admin-primary);
    color: white;
}

/* ============================================= */
/* FILTERS                                        */
/* ============================================= */

.admin-filters {
    margin-bottom: 24px;
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.admin-select {
    padding: 10px 16px;
    border: 2px solid var(--admin-border);
    border-radius: 10px;
    font-size: 0.9rem;
    font-family: inherit;
    background: white;
    cursor: pointer;
    transition: var(--transition);
}

.admin-select:focus {
    outline: none;
    border-color: var(--admin-primary);
}

/* ============================================= */
/* MATERIALS LIST                                 */
/* ============================================= */

.materials-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.material-item {
    background: var(--admin-card-bg);
    border-radius: 12px;
    padding: 20px 24px;
    border: 1px solid var(--admin-border);
    display: flex;
    align-items: center;
    gap: 20px;
    transition: var(--transition);
}

.material-item:hover {
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
    border-color: var(--admin-primary);
}

.material-item__icon {
    width: 48px;
    height: 48px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.material-item__icon--videos {
    background: rgba(239, 68, 68, 0.1);
    color: var(--admin-danger);
}

.material-item__icon--library {
    background: rgba(0, 130, 255, 0.1);
    color: var(--admin-primary);
}

.material-item__icon--articles {
    background: rgba(16, 185, 129, 0.1);
    color: var(--admin-success);
}

.material-item__icon--events {
    background: rgba(245, 158, 11, 0.1);
    color: var(--admin-warning);
}

.material-item__content {
    flex: 1;
    min-width: 0;
}

.material-item__category {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--admin-text-muted);
    margin-bottom: 4px;
}

.material-item__title {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--admin-text);
    margin: 0 0 4px 0;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.material-item__description {
    font-size: 0.9rem;
    color: var(--admin-text-muted);
    margin: 0 0 8px 0;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.material-item__meta {
    display: flex;
    gap: 16px;
    font-size: 0.8rem;
    color: var(--admin-text-muted);
}

.material-item__actions {
    display: flex;
    gap: 8px;
    flex-shrink: 0;
}

.btn--icon {
    width: 36px;
    height: 36px;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
}

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

.file-upload-area {
    background: var(--admin-card-bg);
    border: 2px dashed var(--admin-border);
    border-radius: 16px;
    padding: 48px 24px;
    text-align: center;
    transition: var(--transition);
}

.file-upload-area:hover,
.file-upload-area.dragover {
    border-color: var(--admin-primary);
    background: rgba(0, 130, 255, 0.02);
}

.file-upload-area svg {
    color: var(--admin-text-muted);
    margin-bottom: 16px;
}

.file-upload-area p {
    color: var(--admin-text-muted);
    margin-bottom: 16px;
}

.file-upload-hint {
    font-size: 0.85rem;
    padding: 12px 16px;
    background: rgba(0, 130, 255, 0.05);
    border-radius: 8px;
    border-left: 3px solid var(--admin-primary);
    margin: 16px auto;
    max-width: 500px;
    line-height: 1.5;
}

.file-upload-hint a {
    color: var(--admin-primary);
    text-decoration: none;
    font-weight: 600;
}

.file-upload-hint a:hover {
    text-decoration: underline;
}

.file-upload-area .btn--outline {
    border-color: var(--admin-primary);
    color: var(--admin-primary);
    background: white;
    padding: 10px 20px;
    font-weight: 600;
}

.file-upload-area .btn--outline:hover {
    background: var(--admin-primary);
    color: white;
}

.uploaded-files {
    margin-top: 24px;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 16px;
}

.file-item {
    background: var(--admin-card-bg);
    border: 1px solid var(--admin-border);
    border-radius: 10px;
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    transition: var(--transition);
}

.file-item:hover {
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
    border-color: var(--admin-primary);
}

.file-item__icon {
    width: 40px;
    height: 40px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.file-item__icon--document {
    background: rgba(239, 68, 68, 0.1);
    color: var(--admin-danger);
}

.file-item__icon--presentation {
    background: rgba(245, 158, 11, 0.1);
    color: var(--admin-warning);
}

.file-item__icon--archive {
    background: rgba(99, 102, 241, 0.1);
    color: #6366f1;
}

.file-item__icon--file {
    background: rgba(100, 116, 139, 0.1);
    color: var(--admin-text-muted);
}

.file-item__content {
    flex: 1;
    min-width: 0;
}

.file-item__name {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--admin-text);
    word-break: break-word;
    margin-bottom: 4px;
}

.file-item__meta {
    font-size: 0.75rem;
    color: var(--admin-text-muted);
    display: flex;
    gap: 6px;
    align-items: center;
    flex-wrap: wrap;
}

.file-item__actions {
    display: flex;
    gap: 8px;
    margin-top: auto;
}

.file-item__actions .btn {
    padding: 6px 12px;
    font-size: 0.8rem;
    border-color: var(--admin-primary);
    color: var(--admin-primary);
    background: white;
}

.file-item__actions .btn:hover {
    background: var(--admin-primary);
    color: white;
}

.file-count {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--admin-text-muted);
    background: rgba(0, 130, 255, 0.1);
    padding: 6px 12px;
    border-radius: 8px;
}

/* ============================================= */
/* SETTINGS FORM                                  */
/* ============================================= */

.settings-form {
    background: var(--admin-card-bg);
    border-radius: 12px;
    padding: 24px;
    border: 1px solid var(--admin-border);
}

.settings-form .form-group {
    margin-bottom: 20px;
}

.settings-form label {
    display: block;
    font-weight: 600;
    color: var(--admin-text);
    margin-bottom: 8px;
    font-size: 0.9rem;
}

.settings-form input {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--admin-border);
    border-radius: 10px;
    font-size: 0.95rem;
    font-family: inherit;
    transition: var(--transition);
    box-sizing: border-box;
}

.settings-form input:focus {
    outline: none;
    border-color: var(--admin-primary);
}

.settings-form small {
    display: block;
    margin-top: 6px;
    color: var(--admin-text-muted);
    font-size: 0.8rem;
}

/* ============================================= */
/* MODAL                                          */
/* ============================================= */

.modal {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    padding: 24px;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: white;
    border-radius: 16px;
    width: 100%;
    max-width: 560px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 24px 48px rgba(0, 0, 0, 0.3);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 24px;
    border-bottom: 1px solid var(--admin-border);
}

.modal-header h3 {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--color-dark);
    margin: 0;
}

.modal-close {
    width: 32px;
    height: 32px;
    border: none;
    background: transparent;
    font-size: 1.5rem;
    color: var(--admin-text-muted);
    cursor: pointer;
    border-radius: 8px;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-close:hover {
    background: var(--admin-bg);
    color: var(--admin-text);
}

.material-form {
    padding: 24px;
}

.material-form .form-group {
    margin-bottom: 20px;
}

.material-form label {
    display: block;
    font-weight: 600;
    color: var(--admin-text);
    margin-bottom: 8px;
    font-size: 0.9rem;
}

.material-form input,
.material-form select,
.material-form textarea {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--admin-border);
    border-radius: 10px;
    font-size: 0.95rem;
    font-family: inherit;
    transition: var(--transition);
    box-sizing: border-box;
    resize: vertical;
}

.material-form input:focus,
.material-form select:focus,
.material-form textarea:focus {
    outline: none;
    border-color: var(--admin-primary);
}

.material-form small {
    display: block;
    margin-top: 6px;
    color: var(--admin-text-muted);
    font-size: 0.8rem;
}

.form-actions {
    display: flex;
    gap: 12px;
    justify-content: flex-end;
    margin-top: 24px;
    padding-top: 24px;
    border-top: 1px solid var(--admin-border);
}

.form-actions .btn {
    padding: 10px 20px;
    font-size: 0.9rem;
}

.form-actions .btn--primary {
    background: linear-gradient(135deg, #00E0FF 0%, #0082FF 50%, #0040FF 100%);
    color: white;
    border: none;
}

.form-actions .btn--outline {
    background: transparent;
    color: var(--admin-text);
    border-color: var(--admin-border);
}

.form-actions .btn--outline:hover {
    border-color: var(--admin-primary);
    color: var(--admin-primary);
}

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

.notifications {
    position: fixed;
    top: 24px;
    right: 24px;
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.notification {
    background: white;
    border-radius: 10px;
    padding: 16px 20px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
    display: flex;
    align-items: center;
    gap: 12px;
    min-width: 300px;
    max-width: 480px;
    animation: slideIn 0.3s ease;
    border-left: 4px solid var(--admin-primary);
}

.notification--success {
    border-left-color: var(--admin-success);
}

.notification--error {
    border-left-color: var(--admin-danger);
}

.notification--warning {
    border-left-color: var(--admin-warning);
}

.notification__icon {
    flex-shrink: 0;
}

.notification__message {
    flex: 1;
    font-size: 0.9rem;
    color: var(--admin-text);
}

.notification--success .notification__icon {
    color: var(--admin-success);
}

.notification--error .notification__icon {
    color: var(--admin-danger);
}

.notification--warning .notification__icon {
    color: var(--admin-warning);
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* ============================================= */
/* LOADING SPINNER                                */
/* ============================================= */

.loading-spinner {
    text-align: center;
    padding: 48px 24px;
    color: var(--admin-text-muted);
    font-size: 0.95rem;
}

/* ============================================= */
/* RESPONSIVE                                     */
/* ============================================= */

@media (max-width: 1024px) {
    .admin-content {
        margin-left: 0;
        padding: 20px;
    }
    
    .admin-sidebar {
        transform: translateX(-100%);
        transition: transform 0.3s ease;
    }
    
    .admin-sidebar.mobile-open {
        transform: translateX(0);
    }
}

@media (max-width: 768px) {
    .material-item {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .material-item__actions {
        width: 100%;
        justify-content: flex-end;
    }
    
    .admin-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .login-card {
        padding: 32px 24px;
    }
}