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

:root {
    --bg-primary: #f7f7f8;
    --bg-secondary: #ffffff;
    --text-primary: #2d2d2d;
    --text-secondary: #666666;
    --border-color: #e5e5e5;
    --accent-color: #8b5cf6;
    --accent-hover: #7c3aed;
    --user-message-bg: #8b5cf6;
    --assistant-message-bg: #ffffff;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow: hidden;
}

.container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    max-width: 1200px;
    margin: 0 auto;
    background: var(--bg-secondary);
}

/* Header */
.header {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 1.5rem 2rem;
    box-shadow: var(--shadow);
}

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

.title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

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

/* Chat Container */
.chat-container {
    flex: 1;
    overflow-y: auto;
    padding: 2rem;
    background: var(--bg-primary);
    scroll-behavior: smooth;
}

.chat-container::-webkit-scrollbar {
    width: 8px;
}

.chat-container::-webkit-scrollbar-track {
    background: transparent;
}

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

.chat-container::-webkit-scrollbar-thumb:hover {
    background: #d0d0d0;
}

/* Messages */
.message {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
    animation: slideIn 0.3s ease-out;
}

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

.message-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    flex-shrink: 0;
}

.assistant-message .message-avatar {
    background: var(--accent-color);
}

.user-message .message-avatar {
    background: #10b981;
}

.message-content {
    flex: 1;
    background: var(--bg-secondary);
    padding: 1rem 1.25rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
}

.user-message .message-content {
    background: var(--user-message-bg);
    color: white;
}

.message-content p {
    margin-bottom: 0.75rem;
}

.message-content p:last-child {
    margin-bottom: 0;
}

.message-content ul {
    margin-left: 1.5rem;
    margin-top: 0.5rem;
}

.message-content li {
    margin-bottom: 0.5rem;
}

/* Seminar Cards */
.seminar-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1rem;
    margin-top: 1rem;
    transition: all 0.2s ease;
}

.seminar-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.seminar-card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--accent-color);
    margin-bottom: 0.5rem;
}

.seminar-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 0.75rem;
}

.seminar-tag {
    display: inline-block;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    font-size: 0.875rem;
    border: 1px solid var(--border-color);
}

.seminar-description {
    color: var(--text-primary);
    margin-top: 0.5rem;
    line-height: 1.5;
}

.seminar-speaker {
    color: var(--text-secondary);
    font-style: italic;
    margin-top: 0.5rem;
    font-size: 0.9rem;
}

.seminar-code-badge {
    display: inline-block;
    background: var(--accent-color);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    letter-spacing: 0.5px;
}

/* Loading Animation */
.loading-dots {
    display: flex;
    gap: 0.5rem;
    padding: 0.5rem 0;
}

.loading-dots span {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--accent-color);
    animation: bounce 1.4s infinite ease-in-out both;
}

.loading-dots span:nth-child(1) {
    animation-delay: -0.32s;
}

.loading-dots span:nth-child(2) {
    animation-delay: -0.16s;
}

@keyframes bounce {
    0%, 80%, 100% {
        transform: scale(0);
        opacity: 0.5;
    }
    40% {
        transform: scale(1);
        opacity: 1;
    }
}

/* Input Container */
.input-container {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 1.5rem 2rem;
}

.input-form {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    gap: 0.75rem;
    align-items: flex-end;
}

.input-field {
    flex: 1;
    padding: 0.875rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    font-size: 1rem;
    font-family: inherit;
    resize: none;
    max-height: 150px;
    transition: border-color 0.2s ease;
}

.input-field:focus {
    outline: none;
    border-color: var(--accent-color);
}

.send-button {
    background: var(--accent-color);
    color: white;
    border: none;
    border-radius: 12px;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s ease;
    flex-shrink: 0;
}

.send-button:hover:not(:disabled) {
    background: var(--accent-hover);
    transform: scale(1.05);
}

.send-button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.input-hint {
    max-width: 800px;
    margin: 0 auto;
    margin-top: 0.5rem;
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-align: center;
}

/* Error Message */
.error-message {
    background: #fee;
    border: 1px solid #fcc;
    color: #c00;
    padding: 1rem;
    border-radius: 8px;
    margin-top: 1rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .header {
        padding: 1rem;
    }

    .chat-container {
        padding: 1rem;
    }

    .input-container {
        padding: 1rem;
    }

    .title {
        font-size: 1.25rem;
    }

    .message {
        margin-bottom: 1.5rem;
    }
}