* {
    box-sizing: border-box;
}

body {
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #0f1117;
    color: #e6edf3;
    display: flex;
    flex-direction: column;
    height: 100vh;
    height: 100dvh; /* Dynamic viewport height for mobile */
    overflow: hidden;
}

.chat {
    flex: 1;
    overflow-y: auto;
    padding: clamp(12px, 3vw, 20px);
    display: flex;
    flex-direction: column;
    gap: clamp(10px, 2vw, 14px);
    background-color: #0f1117;
    min-height: 0; /* Allow flex shrinking */
}

.message {
    max-width: min(65%, 600px);
    padding: clamp(10px, 2.5vw, 14px) clamp(12px, 3vw, 18px);
    border-radius: clamp(8px, 1.5vw, 10px);
    font-size: clamp(14px, 2.5vw, 15px);
    line-height: 1.6;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.4);
    word-wrap: break-word;
    overflow-wrap: break-word;
    hyphens: auto;
}

.userMessage {
    align-self: flex-end;
    background: linear-gradient(135deg, #3a7bd5, #00d2ff);
    color: #fff;
    border-bottom-right-radius: 0;
}

.systemMessage {
    align-self: flex-start;
    background-color: #1c1f26;
    color: #c9d1d9;
    border-bottom-left-radius: 0;
}

.inputField {
    display: flex;
    padding: clamp(8px, 2vw, 12px);
    background: #161b22;
    border-top: 1px solid #30363d;
    gap: clamp(8px, 1.5vw, 10px);
    flex-shrink: 0;
}

.inputField input {
    flex: 1;
    padding: clamp(8px, 2vw, 10px) clamp(10px, 2.5vw, 14px);
    font-size: clamp(14px, 2.5vw, 15px);
    background-color: #0d1117;
    color: #e6edf3;
    border: 1px solid #30363d;
    border-radius: clamp(4px, 1vw, 6px);
    outline: none;
    transition: border-color 0.2s;
    min-width: 0; /* Allow input to shrink */
}

.inputField input:focus {
    border-color: #58a6ff;
}

.inputField button {
    padding: clamp(8px, 2vw, 10px) clamp(12px, 3vw, 18px);
    font-size: clamp(14px, 2.5vw, 16px);
    background-color: #238636;
    color: white;
    border: none;
    border-radius: clamp(4px, 1vw, 6px);
    cursor: pointer;
    transition: background-color 0.2s;
    white-space: nowrap;
    flex-shrink: 0;
}

.inputField button:hover {
    background-color: #2ea043;
}

a {
    color: #58a6ff;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

/* Small screens and mobile */
@media (max-width: 768px) {
    .message {
        max-width: 85%;
        font-size: 16px;
    }
    
    .inputField {
        padding: 12px;
        gap: 8px;
    }
    
    .inputField input {
        font-size: 16px; /* Prevents zoom on iOS */
        padding: 12px 14px;
    }
    
    .inputField button {
        padding: 12px 16px;
        font-size: 16px;
    }
}

/* Very small screens */
@media (max-width: 480px) {
    .chat {
        padding: 8px;
        gap: 8px;
    }
    
    .message {
        max-width: 90%;
        padding: 10px 12px;
    }
    
    .inputField {
        flex-direction: column;
        gap: 8px;
    }
    
    .inputField button {
        width: 100%;
        padding: 14px;
    }
}

/* Large screens */
@media (min-width: 1200px) {
    .chat {
        padding: 24px;
        max-width: 1200px;
        margin: 0 auto;
    }
    
    .message {
        max-width: 60%;
    }
}

/* High DPI displays */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    .message {
        box-shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
    }
}