/* TDK Chatbot - Modern ve Profesyonel Tasarım */

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

body {
    font-family: 'Segoe UI', 'SF Pro Display', -apple-system, BlinkMacSystemFont, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

/* Ana Container */
.container {
    max-width: 1000px;
    width: 100%;
    background: white;
    border-radius: 24px;
    box-shadow: 0 20px 80px rgba(0,0,0,0.3);
    overflow: hidden;
    backdrop-filter: blur(10px);
}

/* Header */
.header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 35px 40px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.header::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
    animation: pulse 15s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1) rotate(0deg); }
    50% { transform: scale(1.1) rotate(180deg); }
}

.header h1 {
    font-size: 2.2em;
    margin-bottom: 12px;
    font-weight: 700;
    position: relative;
    z-index: 1;
    text-shadow: 0 2px 10px rgba(0,0,0,0.2);
}

.header p {
    opacity: 0.95;
    font-size: 1.15em;
    position: relative;
    z-index: 1;
    font-weight: 400;
}

/* Chat Container */
.chat-container {
    height: 550px;
    overflow-y: auto;
    padding: 35px;
    background: linear-gradient(to bottom, #f8f9fa 0%, #ffffff 100%);
    scroll-behavior: smooth;
}

/* Scrollbar Styling */
.chat-container::-webkit-scrollbar {
    width: 8px;
}

.chat-container::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 10px;
}

.chat-container::-webkit-scrollbar-thumb {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 10px;
}

.chat-container::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(135deg, #5568d3 0%, #653a8b 100%);
}

/* Messages */
.message {
    margin-bottom: 24px;
    display: flex;
    gap: 12px;
    animation: fadeSlideIn 0.4s ease-out;
}

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

.message.user {
    justify-content: flex-end;
}

.message-content {
    max-width: 75%;
    padding: 16px 22px;
    border-radius: 18px;
    word-wrap: break-word;
    line-height: 1.6;
    box-shadow: 0 2px 10px rgba(0,0,0,0.08);
    transition: transform 0.2s, box-shadow 0.2s;
}

.message-content:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(0,0,0,0.12);
}

.user .message-content {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-bottom-right-radius: 6px;
    font-weight: 500;
}

.bot .message-content {
    background: white;
    color: #2d3748;
    border: 1.5px solid #e2e8f0;
    border-bottom-left-radius: 6px;
}

.bot .message-content strong {
    color: #667eea;
    font-weight: 600;
}

.bot .message-content em {
    font-style: italic;
    color: #4a5568;
}

/* Sources */
.sources {
    margin-top: 18px;
    padding: 18px;
    background: linear-gradient(to bottom, #f7fafc 0%, #edf2f7 100%);
    border-radius: 12px;
    font-size: 0.92em;
    border: 1px solid #e2e8f0;
}

.sources h4 {
    margin-bottom: 12px;
    color: #667eea;
    font-weight: 600;
    font-size: 1.05em;
    display: flex;
    align-items: center;
    gap: 8px;
}

.source-item {
    margin-bottom: 10px;
    padding: 12px 14px;
    background: white;
    border-radius: 8px;
    border-left: 3px solid #667eea;
    transition: all 0.2s;
}

.source-item:hover {
    border-left-color: #764ba2;
    transform: translateX(4px);
    box-shadow: 0 2px 8px rgba(102, 126, 234, 0.15);
}

.source-item strong {
    color: #764ba2;
    display: block;
    margin-bottom: 6px;
    font-size: 1.05em;
}

/* Input Container */
.input-container {
    padding: 25px 35px;
    background: white;
    border-top: 2px solid #f0f0f0;
    box-shadow: 0 -5px 20px rgba(0,0,0,0.05);
}

.input-form {
    display: flex;
    gap: 12px;
    align-items: center;
}

#messageInput {
    flex: 1;
    padding: 16px 24px;
    border: 2px solid #e2e8f0;
    border-radius: 30px;
    font-size: 1.02em;
    outline: none;
    transition: all 0.3s;
    font-family: inherit;
}

#messageInput:focus {
    border-color: #667eea;
    box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.1);
}

#messageInput::placeholder {
    color: #a0aec0;
}

#sendButton {
    padding: 16px 40px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 30px;
    font-size: 1.02em;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

#sendButton:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.5);
}

#sendButton:active {
    transform: translateY(-1px);
}

#sendButton:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

/* Loading Animation */
.loading {
    display: none;
    text-align: center;
    padding: 12px;
}

.loading.active {
    display: block;
}

.loading-dots {
    display: inline-flex;
    gap: 6px;
}

.loading-dots span {
    width: 10px;
    height: 10px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 50%;
    animation: bounce 1.4s infinite ease-in-out;
}

.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;
    }
}

/* Welcome Message */
.welcome-message {
    text-align: center;
    padding: 50px 30px;
    color: #4a5568;
}

.welcome-message h2 {
    color: #667eea;
    margin-bottom: 18px;
    font-size: 1.8em;
    font-weight: 700;
}

.welcome-message p {
    font-size: 1.1em;
    color: #718096;
    margin-bottom: 10px;
}

.example-questions {
    margin-top: 28px;
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: center;
}

.example-btn {
    padding: 12px 24px;
    background: white;
    border: 2px solid #667eea;
    color: #667eea;
    border-radius: 25px;
    cursor: pointer;
    transition: all 0.3s;
    font-size: 0.95em;
    font-weight: 600;
    box-shadow: 0 2px 8px rgba(102, 126, 234, 0.2);
}

.example-btn:hover {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
}

.example-btn:active {
    transform: translateY(-1px);
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        height: 100vh;
        border-radius: 0;
        max-width: 100%;
    }

    .header h1 {
        font-size: 1.6em;
    }

    .header p {
        font-size: 1em;
    }

    .chat-container {
        height: calc(100vh - 280px);
        padding: 20px;
    }

    .message-content {
        max-width: 85%;
        padding: 14px 18px;
    }

    .input-container {
        padding: 18px 20px;
    }

    #messageInput {
        padding: 14px 20px;
        font-size: 1em;
    }

    #sendButton {
        padding: 14px 28px;
        font-size: 1em;
    }

    .example-questions {
        flex-direction: column;
    }

    .example-btn {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .header {
        padding: 25px 20px;
    }

    .header h1 {
        font-size: 1.4em;
    }

    .welcome-message h2 {
        font-size: 1.4em;
    }
}

/* Dark Mode Support (Optional) */
@media (prefers-color-scheme: dark) {
    body {
        background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    }
}