* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: #f5f5f5;
    color: #333;
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

header {
    background: white;
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 1rem;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

header h1 {
    margin-bottom: 0.5rem;
}

nav {
    display: flex;
    gap: 1rem;
}

nav a {
    text-decoration: none;
    color: #0066cc;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    transition: background-color 0.2s;
}

nav a:hover {
    background-color: #f0f0f0;
}

main {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    min-height: 400px;
}

.login-page {
    max-width: 400px;
    margin: 2rem auto;
    padding: 2rem;
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.login-page form {
    margin-top: 1.5rem;
}

.login-page label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.login-page input {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
    margin-bottom: 0.5rem;
}

.login-page small {
    display: block;
    color: #666;
    font-size: 0.875rem;
    margin-bottom: 1rem;
}

button {
    background: #0066cc;
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 4px;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.2s;
}

button:hover {
    background: #0052a3;
}

button:disabled {
    background: #ccc;
    cursor: not-allowed;
}

.btn-danger {
    background: #dc3545;
}

.btn-danger:hover {
    background: #c82333;
}

.dashboard {
    max-width: 800px;
    margin: 0 auto;
}

.stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin: 2rem 0;
}

.stat-card {
    background: #f8f9fa;
    padding: 1.5rem;
    border-radius: 8px;
    text-align: center;
}

.stat-card h2 {
    font-size: 2rem;
    margin: 0;
    color: #0066cc;
}

.stat-card p {
    margin: 0.5rem 0 0 0;
    color: #666;
}

.actions {
    margin: 2rem 0;
    display: flex;
    gap: 1rem;
}

.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    text-decoration: none;
    border-radius: 4px;
    transition: background-color 0.2s;
}

.btn-primary {
    background: #0066cc;
    color: white;
}

.btn-primary:hover {
    background: #0052a3;
}

.ai-chat {
    margin-top: 2rem;
    padding: 1.5rem;
    background: #f8f9fa;
    border-radius: 8px;
}

.ai-chat textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
    font-family: inherit;
    resize: vertical;
    margin-bottom: 0.5rem;
}

.ai-response {
    margin-top: 1rem;
    padding: 1rem;
    background: white;
    border-radius: 4px;
    border-left: 3px solid #0066cc;
}

.error {
    color: #dc3545;
    padding: 0.75rem;
    background: #f8d7da;
    border-radius: 4px;
    margin: 0.5rem 0;
}

.success {
    color: #155724;
    padding: 0.75rem;
    background: #d4edda;
    border-radius: 4px;
    margin: 0.5rem 0;
}

.vocab {
    max-width: 1000px;
    margin: 0 auto;
}

.vocab-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1rem;
    background: white;
    border-radius: 8px;
    overflow: hidden;
}

.vocab-table th,
.vocab-table td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid #ddd;
}

.vocab-table th {
    background: #f8f9fa;
    font-weight: 600;
}

.vocab-table tr:hover {
    background: #f8f9fa;
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

.confirm-delete {
    max-width: 600px;
    margin: 0 auto;
}

.warning {
    background: #fff3cd;
    border: 1px solid #ffc107;
    border-radius: 8px;
    padding: 1.5rem;
    margin: 2rem 0;
}

.warning ul {
    margin: 1rem 0;
    padding-left: 2rem;
}

.confirm-delete .actions {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
}

.training {
    max-width: 600px;
    margin: 0 auto;
}

.progress {
    text-align: center;
    color: #666;
    margin-bottom: 1rem;
}

.question {
    background: #f8f9fa;
    padding: 2rem;
    border-radius: 8px;
    margin: 2rem 0;
    text-align: center;
    font-size: 1.25rem;
}

.thinking {
    text-align: center;
    padding: 2rem;
}

.options {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin: 2rem 0;
}

.option-btn {
    padding: 1rem;
    background: white;
    border: 2px solid #ddd;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    transition: all 0.2s;
}

.option-btn:hover {
    border-color: #0066cc;
    background: #f0f7ff;
}

.feedback {
    padding: 1.5rem;
    border-radius: 8px;
    margin: 1rem 0;
    text-align: center;
    font-size: 1.1rem;
}

.feedback.correct {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.feedback.incorrect {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.example {
    margin-top: 1rem;
    padding: 1rem;
    background: #fff3cd;
    border-radius: 4px;
    font-style: italic;
}

.session-complete {
    text-align: center;
    padding: 3rem;
}

.session-complete h2 {
    color: #0066cc;
    margin-bottom: 1rem;
}

.admin-panel {
    max-width: 1000px;
    margin: 0 auto;
}

.admin-section {
    background: white;
    padding: 1.5rem;
    border-radius: 8px;
    margin: 2rem 0;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.cb-status {
    margin: 1rem 0;
    padding: 1rem;
    background: #f8f9fa;
    border-radius: 4px;
}

.status-open {
    color: #dc3545;
    font-weight: bold;
}

.status-closed {
    color: #28a745;
    font-weight: bold;
}

.training-actions {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.inline-form {
    display: flex;
    gap: 0.5rem;
    align-items: flex-end;
}

.inline-form label {
    display: block;
    margin-bottom: 0.25rem;
}

.inline-form input[type="text"] {
    flex: 1;
    padding: 0.5rem;
    border: 1px solid #ddd;
    border-radius: 4px;
}

.admin-training-data {
    max-width: 1200px;
    margin: 0 auto;
}

.cards-list {
    display: grid;
    gap: 1rem;
    margin: 1rem 0;
}

.card-item {
    background: #f8f9fa;
    padding: 1rem;
    border-radius: 4px;
    border-left: 3px solid #0066cc;
}

.card-item p {
    margin: 0.25rem 0;
}

details {
    margin-top: 1rem;
}

details pre {
    background: #f8f9fa;
    padding: 1rem;
    border-radius: 4px;
    overflow-x: auto;
}