/**
 * CRM Curator - Unified UI Theme
 *
 * Эталон дизайна: /student/view
 *
 * Содержит единые стили для всего проекта:
 * - Цветовая палитра
 * - Карточки и блоки
 * - Кнопки
 * - Формы
 * - Типографика
 * - Модальные окна
 * - Toast уведомления
 */

/* ===========================================
   CSS Variables (Цветовая палитра)
   =========================================== */
:root {
    /* Primary colors */
    --ui-primary: #667eea;
    --ui-primary-dark: #764ba2;
    --ui-primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);

    /* Background colors */
    --ui-bg-page: #f8f9fa;
    --ui-bg-card: #ffffff;
    --ui-bg-hover: #f9fafb;
    --ui-bg-muted: #f8f9fa;

    /* Text colors */
    --ui-text-primary: #1a1a2e;
    --ui-text-secondary: #6b7280;
    --ui-text-muted: #8892a0;
    --ui-text-placeholder: #b0b8c4;

    /* Border colors */
    --ui-border: #e5e7eb;
    --ui-border-light: #f0f0f0;

    /* Status colors */
    --ui-success: #10b981;
    --ui-success-bg: #dcfce7;
    --ui-success-text: #166534;

    --ui-warning: #f59e0b;
    --ui-warning-bg: #fef3c7;
    --ui-warning-text: #92400e;

    --ui-danger: #ef4444;
    --ui-danger-bg: #fee2e2;
    --ui-danger-text: #991b1b;

    --ui-info: #3b82f6;
    --ui-info-bg: #dbeafe;
    --ui-info-text: #1e40af;

    /* Shadows */
    --ui-shadow-sm: 0 2px 12px rgba(0, 0, 0, 0.04);
    --ui-shadow-md: 0 4px 20px rgba(0, 0, 0, 0.08);
    --ui-shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.15);
    --ui-shadow-primary: 0 8px 20px rgba(102, 126, 234, 0.4);

    /* Border radius */
    --ui-radius-sm: 8px;
    --ui-radius-md: 10px;
    --ui-radius-lg: 12px;
    --ui-radius-xl: 16px;

    /* Spacing */
    --ui-space-xs: 4px;
    --ui-space-sm: 8px;
    --ui-space-md: 16px;
    --ui-space-lg: 24px;
    --ui-space-xl: 32px;

    /* Transitions */
    --ui-transition: all 0.2s ease;
    --ui-transition-bounce: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===========================================
   Page Container
   =========================================== */
.ui-page {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--ui-space-lg);
}

@media (max-width: 768px) {
    .ui-page {
        padding: var(--ui-space-md);
    }
}

/* ===========================================
   Cards (Карточки)
   =========================================== */
.ui-card {
    background: var(--ui-bg-card);
    border-radius: var(--ui-radius-xl);
    box-shadow: var(--ui-shadow-md);
    margin-bottom: var(--ui-space-lg);
    overflow: hidden;
}

.ui-card-header {
    padding: 20px var(--ui-space-lg);
    border-bottom: 1px solid var(--ui-border-light);
    display: flex;
    align-items: center;
    gap: var(--ui-space-md);
}

.ui-card-header-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--ui-radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--ui-primary-gradient);
    color: #ffffff;
    flex-shrink: 0;
}

.ui-card-header-icon .material-icons {
    font-size: 20px;
}

.ui-card-header h2,
.ui-card-header h6 {
    margin: 0;
    font-size: 16px;
    font-weight: 600;
    color: var(--ui-text-primary);
}

.ui-card-body {
    padding: var(--ui-space-lg);
}

/* Card header variants */
.ui-card-header.gradient {
    background: var(--ui-primary-gradient);
    border-bottom: none;
}

.ui-card-header.gradient h2,
.ui-card-header.gradient h6 {
    color: #ffffff;
}

.ui-card-header.gradient .material-icons {
    color: #ffffff;
}

/* ===========================================
   Icon Box Variants
   =========================================== */
.ui-icon-box {
    width: 40px;
    height: 40px;
    border-radius: var(--ui-radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.ui-icon-box .material-icons {
    font-size: 20px;
    color: #ffffff;
}

.ui-icon-box.primary { background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); }
.ui-icon-box.success { background: linear-gradient(135deg, #10b981 0%, #059669 100%); }
.ui-icon-box.warning { background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%); }
.ui-icon-box.danger { background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%); }
.ui-icon-box.info { background: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%); }
.ui-icon-box.pink { background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%); }
.ui-icon-box.cyan { background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%); }
.ui-icon-box.green { background: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%); }
.ui-icon-box.orange { background: linear-gradient(135deg, #fa709a 0%, #fee140 100%); }
.ui-icon-box.purple { background: linear-gradient(135deg, #a18cd1 0%, #fbc2eb 100%); }

/* Large icon box for stats */
.ui-icon-box.lg {
    width: 48px;
    height: 48px;
}

.ui-icon-box.lg .material-icons {
    font-size: 24px;
}

/* ===========================================
   Info Grid (Информационная сетка)
   =========================================== */
.ui-info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: var(--ui-space-lg);
}

.ui-info-item {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.ui-info-label {
    font-size: 11px;
    font-weight: 600;
    color: var(--ui-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.8px;
}

.ui-info-value {
    font-size: 15px;
    font-weight: 500;
    color: var(--ui-text-primary);
    line-height: 1.4;
}

.ui-info-value.empty {
    color: var(--ui-text-placeholder);
    font-style: italic;
    font-weight: 400;
}

/* ===========================================
   Buttons (Кнопки)
   =========================================== */
.ui-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--ui-space-sm);
    padding: 12px 24px;
    border-radius: var(--ui-radius-md);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--ui-transition);
    border: none;
    text-decoration: none;
    white-space: nowrap;
}

.ui-btn .material-icons {
    font-size: 20px;
}

/* Primary button */
.ui-btn-primary {
    background: var(--ui-primary-gradient);
    color: #ffffff;
}

.ui-btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--ui-shadow-primary);
    color: #ffffff;
}

.ui-btn-primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

/* Secondary button */
.ui-btn-secondary {
    background: var(--ui-bg-card);
    color: var(--ui-text-primary);
    border: 2px solid var(--ui-border);
}

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

/* Success button */
.ui-btn-success {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    color: #ffffff;
}

.ui-btn-success:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(16, 185, 129, 0.4);
    color: #ffffff;
}

/* Danger button */
.ui-btn-danger {
    background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
    color: #ffffff;
}

.ui-btn-danger:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(239, 68, 68, 0.4);
    color: #ffffff;
}

/* Warning button */
.ui-btn-warning {
    background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
    color: #ffffff;
}

.ui-btn-warning:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(245, 158, 11, 0.4);
    color: #ffffff;
}

/* Small button */
.ui-btn-sm {
    padding: 8px 16px;
    font-size: 13px;
}

.ui-btn-sm .material-icons {
    font-size: 18px;
}

/* Icon-only button */
.ui-btn-icon {
    width: 36px;
    height: 36px;
    padding: 0;
    border-radius: var(--ui-radius-sm);
}

.ui-btn-icon .material-icons {
    font-size: 18px;
}

.ui-btn-icon.primary { background: var(--ui-info-bg); color: var(--ui-info); }
.ui-btn-icon.primary:hover { background: #c7d2fe; }

.ui-btn-icon.success { background: var(--ui-success-bg); color: var(--ui-success); }
.ui-btn-icon.success:hover { background: #bbf7d0; }

.ui-btn-icon.warning { background: var(--ui-warning-bg); color: var(--ui-warning); }
.ui-btn-icon.warning:hover { background: #fde68a; }

.ui-btn-icon.danger { background: var(--ui-danger-bg); color: var(--ui-danger); }
.ui-btn-icon.danger:hover { background: #fecaca; }

/* ===========================================
   Forms (Формы)
   =========================================== */
.ui-form-group {
    margin-bottom: 20px;
}

.ui-form-group:last-child {
    margin-bottom: 0;
}

.ui-form-label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--ui-text-primary);
    margin-bottom: var(--ui-space-sm);
}

.ui-form-input,
.ui-form-select,
.ui-form-textarea {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--ui-border);
    border-radius: var(--ui-radius-md);
    font-size: 14px;
    color: var(--ui-text-primary);
    background: var(--ui-bg-card);
    transition: var(--ui-transition);
    box-sizing: border-box;
}

.ui-form-input:focus,
.ui-form-select:focus,
.ui-form-textarea:focus {
    outline: none;
    border-color: var(--ui-primary);
    box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.1);
}

.ui-form-input::placeholder,
.ui-form-textarea::placeholder {
    color: var(--ui-text-placeholder);
}

.ui-form-input:disabled,
.ui-form-select:disabled,
.ui-form-textarea:disabled {
    background: var(--ui-bg-muted);
    color: var(--ui-text-muted);
    cursor: not-allowed;
}

.ui-form-hint {
    margin-top: 6px;
    font-size: 12px;
    color: var(--ui-text-muted);
}

/* ===========================================
   Badges (Бейджи)
   =========================================== */
.ui-badge {
    display: inline-flex;
    align-items: center;
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 500;
}

.ui-badge-success { background: var(--ui-success-bg); color: var(--ui-success-text); }
.ui-badge-warning { background: var(--ui-warning-bg); color: var(--ui-warning-text); }
.ui-badge-danger { background: var(--ui-danger-bg); color: var(--ui-danger-text); }
.ui-badge-info { background: var(--ui-info-bg); color: var(--ui-info-text); }
.ui-badge-muted { background: #f3f4f6; color: #6b7280; }
.ui-badge-primary { background: #e0e7ff; color: #3730a3; }

/* ===========================================
   Stats Cards (Статистика)
   =========================================== */
.ui-stats-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--ui-space-md);
    margin-bottom: var(--ui-space-lg);
}

.ui-stat-card {
    background: var(--ui-bg-card);
    border-radius: var(--ui-radius-lg);
    padding: 20px;
    box-shadow: var(--ui-shadow-sm);
    display: flex;
    align-items: center;
    gap: var(--ui-space-md);
}

.ui-stat-value {
    margin: 0;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--ui-text-primary);
}

.ui-stat-label {
    margin: 4px 0 0 0;
    font-size: 13px;
    color: var(--ui-text-muted);
}

/* ===========================================
   Table (Таблицы)
   =========================================== */
.ui-table {
    width: 100%;
    border-collapse: collapse;
}

.ui-table th {
    padding: 14px 20px;
    text-align: left;
    font-size: 12px;
    font-weight: 600;
    color: var(--ui-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    background: #fafafa;
    border-bottom: 1px solid var(--ui-border);
}

.ui-table td {
    padding: 16px 20px;
    border-bottom: 1px solid var(--ui-border-light);
    vertical-align: middle;
}

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

.ui-table tr:hover td {
    background: var(--ui-bg-hover);
}

/* ===========================================
   User Info (Информация о пользователе)
   =========================================== */
.ui-user-info {
    display: flex;
    align-items: center;
    gap: var(--ui-space-md);
}

.ui-user-avatar {
    width: 40px;
    height: 40px;
    border-radius: var(--ui-radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 14px;
    color: #ffffff;
    flex-shrink: 0;
    background: var(--ui-primary-gradient);
}

.ui-user-name {
    font-weight: 600;
    color: var(--ui-text-primary);
}

.ui-user-email {
    font-size: 13px;
    color: var(--ui-text-muted);
    margin-top: 2px;
}

/* ===========================================
   Modal (Модальные окна)
   =========================================== */
.ui-modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1100;
    opacity: 0;
    visibility: hidden;
    transition: var(--ui-transition);
}

.ui-modal-overlay.show {
    opacity: 1;
    visibility: visible;
}

.ui-modal {
    background: var(--ui-bg-card);
    border-radius: var(--ui-radius-xl);
    width: 100%;
    max-width: 480px;
    max-height: 90vh;
    overflow-y: auto;
    transform: scale(0.9);
    transition: var(--ui-transition-bounce);
}

.ui-modal-overlay.show .ui-modal {
    transform: scale(1);
}

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

.ui-modal-header h3 {
    margin: 0;
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--ui-text-primary);
}

.ui-modal-close {
    width: 32px;
    height: 32px;
    border-radius: var(--ui-radius-sm);
    border: none;
    background: var(--ui-bg-muted);
    color: var(--ui-text-muted);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--ui-transition);
}

.ui-modal-close:hover {
    background: var(--ui-border);
    color: var(--ui-text-primary);
}

.ui-modal-body {
    padding: var(--ui-space-lg);
}

.ui-modal-footer {
    padding: var(--ui-space-md) var(--ui-space-lg);
    border-top: 1px solid var(--ui-border);
    display: flex;
    justify-content: flex-end;
    gap: var(--ui-space-md);
}

/* Confirm modal (small centered) */
.ui-modal.confirm {
    max-width: 380px;
    text-align: center;
}

.ui-modal.confirm .ui-modal-body {
    padding: var(--ui-space-xl);
}

.ui-confirm-icon {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--ui-space-md);
}

.ui-confirm-icon.warning { background: var(--ui-warning-bg); }
.ui-confirm-icon.warning .material-icons { color: var(--ui-warning); font-size: 28px; }

.ui-confirm-icon.danger { background: var(--ui-danger-bg); }
.ui-confirm-icon.danger .material-icons { color: var(--ui-danger); font-size: 28px; }

.ui-confirm-icon.success { background: var(--ui-success-bg); }
.ui-confirm-icon.success .material-icons { color: var(--ui-success); font-size: 28px; }

.ui-confirm-title {
    margin: 0 0 var(--ui-space-sm) 0;
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--ui-text-primary);
}

.ui-confirm-message {
    margin: 0 0 var(--ui-space-lg) 0;
    color: var(--ui-text-muted);
    font-size: 14px;
}

.ui-confirm-actions {
    display: flex;
    gap: var(--ui-space-md);
}

.ui-confirm-actions .ui-btn {
    flex: 1;
}

/* ===========================================
   Toast Notifications
   =========================================== */
.ui-toast {
    position: fixed;
    top: 24px;
    right: 24px;
    background: var(--ui-bg-card);
    border-radius: var(--ui-radius-lg);
    box-shadow: var(--ui-shadow-lg);
    padding: 16px 20px;
    display: flex;
    align-items: center;
    gap: var(--ui-space-md);
    z-index: 9999;
    transform: translateX(120%);
    transition: var(--ui-transition-bounce);
    min-width: 280px;
}

.ui-toast.show {
    transform: translateX(0);
}

.ui-toast-icon {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.ui-toast-icon.success { background: linear-gradient(135deg, #10b981 0%, #059669 100%); }
.ui-toast-icon.error { background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%); }
.ui-toast-icon.warning { background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%); }
.ui-toast-icon.info { background: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%); }

.ui-toast-icon .material-icons {
    color: #ffffff;
    font-size: 20px;
}

.ui-toast-message {
    font-size: 14px;
    color: var(--ui-text-primary);
    font-weight: 500;
}

/* ===========================================
   Breadcrumb (Хлебные крошки)
   =========================================== */
.ui-breadcrumb {
    display: flex;
    align-items: center;
    gap: var(--ui-space-sm);
    margin-bottom: var(--ui-space-lg);
    font-size: 14px;
}

.ui-breadcrumb a {
    color: var(--ui-text-muted);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 4px;
    transition: var(--ui-transition);
}

.ui-breadcrumb a:hover {
    color: var(--ui-primary);
}

.ui-breadcrumb .material-icons {
    font-size: 18px;
}

.ui-breadcrumb .separator {
    color: #d1d5db;
}

.ui-breadcrumb .current {
    color: var(--ui-text-primary);
    font-weight: 500;
}

/* ===========================================
   Back Link
   =========================================== */
.ui-back-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--ui-primary);
    font-weight: 500;
    font-size: 14px;
    text-decoration: none;
    margin-bottom: 20px;
    transition: var(--ui-transition);
}

.ui-back-link:hover {
    color: var(--ui-primary-dark);
    transform: translateX(-4px);
}

.ui-back-link .material-icons {
    font-size: 20px;
}

/* ===========================================
   Page Header
   =========================================== */
.ui-page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--ui-space-lg);
}

.ui-page-header-info {
    display: flex;
    align-items: center;
    gap: var(--ui-space-md);
}

.ui-page-icon {
    width: 56px;
    height: 56px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--ui-primary-gradient);
}

.ui-page-icon .material-icons {
    font-size: 28px;
    color: #ffffff;
}

.ui-page-title {
    margin: 0 0 4px 0;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--ui-text-primary);
}

.ui-page-subtitle {
    margin: 0;
    color: var(--ui-text-muted);
    font-size: 14px;
}

@media (max-width: 768px) {
    .ui-page-header {
        flex-direction: column;
        gap: var(--ui-space-md);
        align-items: stretch;
    }
}

/* ===========================================
   Empty State
   =========================================== */
.ui-empty-state {
    padding: 60px 20px;
    text-align: center;
}

.ui-empty-icon {
    width: 80px;
    height: 80px;
    background: var(--ui-bg-muted);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
}

.ui-empty-icon .material-icons {
    font-size: 40px;
    color: #9ca3af;
}

.ui-empty-state h3 {
    margin: 0 0 var(--ui-space-sm) 0;
    color: var(--ui-text-primary);
    font-size: 1.125rem;
}

.ui-empty-state p {
    margin: 0;
    color: var(--ui-text-muted);
    font-size: 14px;
}

/* ===========================================
   Gradient Header Card
   =========================================== */
.ui-header-card {
    background: var(--ui-primary-gradient);
    border-radius: var(--ui-radius-xl);
    padding: 28px;
    margin-bottom: var(--ui-space-lg);
    color: #ffffff;
    position: relative;
    overflow: hidden;
}

.ui-header-card::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 60%;
    height: 200%;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    pointer-events: none;
}

.ui-header-content {
    position: relative;
    z-index: 1;
}

.ui-header-card h1,
.ui-header-card h3 {
    margin: 0 0 12px 0;
    font-size: 28px;
    font-weight: 700;
    color: #ffffff;
}

.ui-header-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    margin-bottom: 20px;
}

.ui-header-meta-item {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 14px;
    color: rgba(255, 255, 255, 0.9);
}

.ui-header-meta-item .material-icons {
    font-size: 18px;
    opacity: 0.8;
}

/* ===========================================
   Two Column Layout
   =========================================== */
.ui-two-column {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--ui-space-lg);
}

@media (max-width: 992px) {
    .ui-two-column {
        grid-template-columns: 1fr;
    }
}

/* ===========================================
   Spin Animation
   =========================================== */
.ui-spin {
    animation: ui-spin 1s linear infinite;
}

@keyframes ui-spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* ===========================================
   Actions Row
   =========================================== */
.ui-actions {
    display: flex;
    gap: var(--ui-space-sm);
    justify-content: flex-end;
}

@media (max-width: 768px) {
    .ui-actions {
        flex-wrap: wrap;
    }
}