* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: #f4f7f6;
    color: #333;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.container {
    background: white;
    width: 90%;
    max-width: 600px;
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
    text-align: center;
}

.screen {
    display: none;
}

.screen.active {
    display: block;
    animation: fadeIn 0.5s;
}

h1, h2 {
    color: #2c3e50;
    margin-bottom: 20px;
}

p {
    color: #7f8c8d;
    line-height: 1.6;
    margin-bottom: 30px;
}

button {
    background-color: #3498db;
    color: white;
    border: none;
    padding: 15px 30px;
    font-size: 16px;
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.3s;
    width: 100%;
    margin-bottom: 10px;
}

button:hover {
    background-color: #2980b9;
}

.option-btn {
    background-color: #ecf0f1;
    color: #2c3e50;
}

.option-btn:hover {
    background-color: #bdc3c7;
}

#progress-text {
    margin-top: 20px;
    font-size: 14px;
    color: #bdc3c7;
}

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

/* --- Sohbet Ekranı Stilleri --- */
.chat-header {
    border-bottom: 1px solid #ecf0f1;
    padding-bottom: 10px;
    margin-bottom: 15px;
}

.chat-header h2 { margin-bottom: 5px; font-size: 20px; }
.chat-header p { margin-bottom: 0; font-size: 13px; }

#chat-box {
    height: 350px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 15px;
    padding: 15px;
    background: #fafafa;
    border-radius: 8px;
    margin-bottom: 15px;
    border: 1px solid #ecf0f1;
}

.message {
    max-width: 80%;
    padding: 12px 16px;
    border-radius: 15px;
    font-size: 14px;
    line-height: 1.5;
    word-wrap: break-word;
    text-align: left;
}

.user-message {
    background-color: #3498db;
    color: white;
    align-self: flex-end;
    border-bottom-right-radius: 2px;
}

.ai-message {
    background-color: #ecf0f1;
    color: #2c3e50;
    align-self: flex-start;
    border-bottom-left-radius: 2px;
}

.chat-input-area {
    display: flex;
    gap: 10px;
}

#user-input {
    flex: 1;
    padding: 12px;
    border: 1px solid #bdc3c7;
    border-radius: 8px;
    font-size: 14px;
    outline: none;
    transition: border 0.3s;
}

#user-input:focus { border-color: #3498db; }

#send-btn {
    width: auto;
    margin-bottom: 0;
    padding: 12px 20px;
}