:root {
    --primary-color: #007bff;
    --primary-hover: #0056b3;
    --bg-color: #f4f4f9;
    --chat-bg: #ffffff;
    --user-msg-bg: #007bff;
    --user-msg-text: #ffffff;
    --ai-msg-bg: #e9ecef;
    --ai-msg-text: #333333;
    --border-color: #ddd;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.chat-container {
    width: 100%;
    max-width: 480px;
    height: 90vh; /* On mobile, takes most of screen */
    background-color: var(--chat-bg);
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.chat-header {
    padding: 16px;
    background-color: var(--primary-color);
    color: white;
    text-align: center;
    font-weight: 600;
}

.messages-area {
    flex: 1;
    padding: 16px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 12px;
    scroll-behavior: smooth;
}

.message {
    max-width: 80%;
    display: flex;
    flex-direction: column;
}

.message-content {
    padding: 10px 14px;
    border-radius: 18px;
    font-size: 0.95rem;
    line-height: 1.4;
    word-wrap: break-word;
}

.user-message {
    align-self: flex-end;
}

.user-message .message-content {
    background-color: var(--user-msg-bg);
    color: var(--user-msg-text);
    border-bottom-right-radius: 4px;
}

.ai-message {
    align-self: flex-start;
}

.ai-message .message-content {
    background-color: var(--ai-msg-bg);
    color: var(--ai-msg-text);
    border-bottom-left-radius: 4px;
}

.input-area {
    padding: 12px;
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: 10px;
    align-items: center;
    background-color: var(--chat-bg);
}

#message-input {
    flex: 1;
    padding: 10px 14px;
    border: 1px solid var(--border-color);
    border-radius: 20px;
    outline: none;
    font-size: 1rem;
    transition: border-color 0.2s;
}

#message-input:focus {
    border-color: var(--primary-color);
}

.icon-btn {
    background: none;
    border: none;
    font-size: 1.2rem;
    cursor: pointer;
    padding: 8px;
    border-radius: 50%;
    transition: background-color 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
}

.icon-btn:hover {
    background-color: rgba(0, 0, 0, 0.05);
}

.send-btn {
    color: var(--primary-color);
}

#record-btn {
    color: #666;
}

#record-btn.recording {
    color: #dc3545;
    animation: pulse 1.5s infinite;
}

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

@media (max-width: 480px) {
    .chat-container {
        height: 100vh;
        border-radius: 0;
        max-width: 100%;
    }
}

/* Thinking dots animation */
.typing-indicator {
    display: flex;
    gap: 4px;
    padding: 10px 14px;
    background-color: var(--ai-msg-bg);
    border-radius: 18px;
    width: fit-content;
    margin-bottom: 12px;
}

.typing-indicator span {
    width: 8px;
    height: 8px;
    background-color: #999;
    border-radius: 50%;
    animation: bounce 1.3s infinite;
}

.typing-indicator span:nth-child(2) { animation-delay: 0.2s; }
.typing-indicator span:nth-child(3) { animation-delay: 0.4s; }

@keyframes bounce {
    0%, 60%, 100% { transform: translateY(0); }
    30% { transform: translateY(-6px); }
}

/* Speaking Waveform */
.speaking-overlay {
    position: absolute;
    bottom: 80px;
    left: 50%;
    transform: translateX(-50%);
    display: none; /* Hidden by default */
    align-items: center;
    gap: 3px;
    height: 30px;
}

.speaking-overlay.active { display: flex; }

.bar {
    width: 4px;
    height: 10px;
    background-color: var(--primary-color);
    animation: wave 0.5s ease-in-out infinite alternate;
}

@keyframes wave {
    from { height: 5px; }
    to { height: 25px; }
}