/* CSS Reset & Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --secondary-color: #10b981;
    --danger-color: #ef4444;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-tertiary: #f3f4f6;
    --border-color: #e5e7eb;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* Header */
.header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.logo {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo i {
    color: #fbbf24;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.5rem 1rem;
    background: var(--bg-secondary);
    border-radius: 50px;
}

.user-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    object-fit: cover;
}

.user-name {
    font-weight: 500;
    color: var(--text-primary);
}

/* Buttons */
.btn-primary {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 0.625rem 1.5rem;
    border-radius: 8px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-icon {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 50%;
    transition: all 0.2s;
}

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

.btn-block {
    width: 100%;
}

/* Main Container */
.main-container {
    padding: 2rem 0;
}

.chat-wrapper {
    background: white;
    border-radius: 16px;
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    max-width: 900px;
    margin: 0 auto;
}

/* Chat Container */
.chat-container {
    height: 600px;
    overflow-y: auto;
    padding: 1.5rem;
    background: var(--bg-secondary);
}

.message-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

/* Message Cards */
.message-card {
    background: white;
    border-radius: 12px;
    padding: 1.25rem;
    box-shadow: var(--shadow-sm);
    animation: fadeIn 0.3s ease-in;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.message-card.question {
    border-left: 4px solid var(--primary-color);
}

.message-card.answer {
    border-left: 4px solid var(--secondary-color);
    background: #f0fdf4;
}

.message-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
}

.message-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    object-fit: cover;
}

.message-info {
    flex: 1;
}

.message-author {
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.message-badge {
    font-size: 0.75rem;
    padding: 0.125rem 0.5rem;
    border-radius: 12px;
    font-weight: 500;
}

.message-badge.question {
    background: #dbeafe;
    color: #1e40af;
}

.message-badge.answer {
    background: #d1fae5;
    color: #065f46;
}

.message-time {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.message-content {
    color: var(--text-primary);
    line-height: 1.6;
    white-space: pre-wrap;
    word-wrap: break-word;
}

.message-actions {
    margin-top: 0.75rem;
    display: flex;
    gap: 0.5rem;
}

.message-actions button {
    padding: 0.25rem 0.75rem;
    font-size: 0.875rem;
    border-radius: 6px;
    background: var(--danger-color);
    color: white;
    border: none;
    cursor: pointer;
    transition: all 0.2s;
}

.message-actions button:hover {
    background: #dc2626;
}

/* Input Container */
.input-container {
    background: white;
    border-top: 1px solid var(--border-color);
    padding: 1.5rem;
}

.input-wrapper {
    display: flex;
    gap: 1rem;
    align-items: flex-end;
}

.message-input {
    flex: 1;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 0.875rem;
    font-family: inherit;
    font-size: 1rem;
    resize: vertical;
    min-height: 80px;
    transition: all 0.2s;
}

.message-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.btn-send {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 1rem 2rem;
    border-radius: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    white-space: nowrap;
}

.btn-send:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-send.answer {
    background: var(--secondary-color);
}

.btn-send.answer:hover {
    background: #059669;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal.show {
    display: flex;
}

.modal-content {
    background: white;
    border-radius: 16px;
    width: 90%;
    max-width: 450px;
    box-shadow: var(--shadow-lg);
    animation: modalSlideIn 0.3s ease-out;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h2 {
    font-size: 1.5rem;
    font-weight: 600;
}

.modal-close {
    background: transparent;
    border: none;
    font-size: 1.5rem;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 50%;
    transition: all 0.2s;
}

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

.modal-body {
    padding: 1.5rem;
}

/* Form */
.form-group {
    margin-bottom: 1.25rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-primary);
}

.form-input {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-family: inherit;
    font-size: 1rem;
    transition: all 0.2s;
}

.form-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.error-message {
    background: #fee2e2;
    color: #991b1b;
    padding: 0.75rem;
    border-radius: 8px;
    margin-bottom: 1rem;
    font-size: 0.875rem;
}

/* Admin Panel */
.admin-panel {
    position: fixed;
    right: 0;
    top: 100px;
    width: 350px;
    max-height: calc(100vh - 120px);
    background: white;
    box-shadow: var(--shadow-lg);
    border-radius: 16px 0 0 16px;
    transform: translateX(100%);
    transition: transform 0.3s ease;
    z-index: 50;
}

.admin-panel.open {
    transform: translateX(0);
}

.toggle-panel-btn {
    position: absolute;
    left: -40px;
    top: 20px;
    width: 40px;
    height: 40px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px 0 0 8px;
    cursor: pointer;
    box-shadow: var(--shadow-md);
    transition: all 0.2s;
}

.toggle-panel-btn:hover {
    background: var(--primary-dark);
}

.admin-panel-content {
    padding: 1.5rem;
    overflow-y: auto;
    max-height: calc(100vh - 120px);
}

.admin-panel-content h3 {
    margin-bottom: 1.5rem;
    color: var(--primary-color);
}

.admin-section {
    margin-bottom: 2rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--border-color);
}

.admin-section:last-child {
    border-bottom: none;
}

.admin-section h4 {
    font-size: 1rem;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-primary);
}

.admin-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.admin-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem;
    background: var(--bg-secondary);
    border-radius: 8px;
}

.admin-item img {
    width: 36px;
    height: 36px;
    border-radius: 50%;
}

.admin-item-info {
    flex: 1;
}

.admin-item-name {
    font-weight: 500;
    color: var(--text-primary);
}

.admin-item-username {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.admin-item button {
    background: var(--danger-color);
    color: white;
    border: none;
    padding: 0.375rem 0.75rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.875rem;
}

.admin-item button:hover {
    background: #dc2626;
}

/* Toast */
.toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background: var(--text-primary);
    color: white;
    padding: 1rem 1.5rem;
    border-radius: 8px;
    box-shadow: var(--shadow-lg);
    z-index: 2000;
    transform: translateX(400px);
    transition: transform 0.3s ease;
}

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

.toast.success {
    background: var(--secondary-color);
}

.toast.error {
    background: var(--danger-color);
}

/* Scrollbar */
.chat-container::-webkit-scrollbar,
.admin-panel-content::-webkit-scrollbar {
    width: 8px;
}

.chat-container::-webkit-scrollbar-track,
.admin-panel-content::-webkit-scrollbar-track {
    background: var(--bg-tertiary);
}

.chat-container::-webkit-scrollbar-thumb,
.admin-panel-content::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

.chat-container::-webkit-scrollbar-thumb:hover,
.admin-panel-content::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* Responsive */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 1rem;
    }

    .chat-wrapper {
        border-radius: 0;
    }

    .chat-container {
        height: calc(100vh - 320px);
    }

    .input-wrapper {
        flex-direction: column;
        align-items: stretch;
    }

    .btn-send {
        justify-content: center;
    }

    .admin-panel {
        width: 100%;
        border-radius: 0;
        top: 80px;
        max-height: calc(100vh - 80px);
    }

    .toggle-panel-btn {
        left: auto;
        right: 1rem;
        border-radius: 8px;
    }

    .admin-panel.open .toggle-panel-btn {
        display: none;
    }
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--text-secondary);
}

.empty-state i {
    font-size: 3rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

.empty-state p {
    font-size: 1.125rem;
}