/* ==========================
   Root Variables (Light Mode Default)
   ========================== */
:root {
    --chat-bg: #fff;
    --chat-text: #333;
    --chat-header-bg: #007bff;
    --chat-header-text: #fff;
    --input-bg: #fff;
    --input-text: #333;
    --input-border: #ccc;
    --btn-bg: #f1f1f1;
    --btn-text: #333;
    --btn-hover-bg: #e0e0e0;
    --btn-hover-text: #333;
    --link-color: #007bff;
    --link-hover-color: #0056b3;
    --shadow-light: rgba(0,0,0,0.1);
    --shadow-dark: rgba(0,0,0,0.25);
}

/* ==========================
   Dark Mode (auto-detect)
   ========================== */
@media (prefers-color-scheme: dark) {
    :root {
        --chat-bg: #1e1e2f;
        --chat-text: #eee;
        --chat-header-bg: #0d6efd;
        --chat-header-text: #fff;
        --input-bg: #2a2a3a;
        --input-text: #eee;
        --input-border: #555;
        --btn-bg: #2a2a3a;
        --btn-text: #eee;
        --btn-hover-bg: #3a3a4a;
        --btn-hover-text: #fff;
        --link-color: #66b0ff;
        --link-hover-color: #a0d1ff;
        --shadow-light: rgba(0,0,0,0.4);
        --shadow-dark: rgba(0,0,0,0.6);
    }
}

/* ==========================
   Chat Toggle Button
   ========================== */
#chat-toggle {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background-color: var(--chat-header-bg);
    color: var(--chat-header-text);
    font-size: 22px;
    text-align: center;
    line-height: 1;
    padding: 16px;
    border-radius: 50%;
    cursor: pointer;
    z-index: 999;
    box-shadow: 0 4px 12px var(--shadow-dark);
    transition: transform 0.2s ease, background 0.2s ease, box-shadow 0.2s ease;
}

#chat-toggle:hover {
    transform: scale(1.1);
    background-color: #0056b3;
    box-shadow: 0 6px 18px var(--shadow-dark);
}

/* ==========================
   Chatbox Container
   ========================== */
#chat-box {
    display: none;
    position: fixed;
    bottom: 80px;
    right: 20px;
    width: 360px;
    max-width: 95%;
    background-color: var(--chat-bg);
    border: 1px solid #ddd;
    border-radius: 12px;
    z-index: 999;
    box-shadow: 0 6px 20px var(--shadow-dark);
    font-family: 'Arial', sans-serif;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: all 0.3s ease, background 0.3s ease, color 0.3s ease;
}

/* ==========================
   Chatbox Header
   ========================== */
#chat-box > div:first-child {
    background-color: var(--chat-header-bg);
    color: var(--chat-header-text);
    padding: 14px 16px;
    font-weight: bold;
    font-size: 15px;
    border-radius: 12px 12px 0 0;
    text-align: center;
    box-shadow: inset 0 -2px 4px var(--shadow-light);
}

/* ==========================
   Chat Messages Area
   ========================== */
#chat-messages {
    flex: 1;
    min-height: 250px;
    max-height: 400px;
    overflow-y: auto;
    padding: 12px;
    font-size: 14px;
    background-color: var(--chat-bg);
    color: var(--chat-text);
    scroll-behavior: smooth;
    transition: background 0.3s ease, color 0.3s ease;
}

#chat-messages p { margin: 6px 0; line-height: 1.6; font-size: 14px; word-wrap: break-word; }
#chat-messages b { font-weight: 600; }
#chat-messages a { color: var(--link-color); text-decoration: none; transition: color 0.2s ease; }
#chat-messages a:hover { color: var(--link-hover-color); text-decoration: underline; }
#chat-messages img { max-width: 100%; height: auto; margin: 10px 0; border-radius: 6px; transition: transform 0.2s ease; }
#chat-messages img:hover { transform: scale(1.02); }
#chat-messages pre, #chat-messages code { background-color: #f1f1f1; padding: 6px 10px; border-radius: 6px; font-size: 12px; overflow-x: auto; }

/* ==========================
   Suggestions Buttons
   ========================== */
.ai-btn {
    margin: 3px 0;
    padding: 6px 14px;
    border: none;
    background-color: var(--btn-bg);
    color: var(--btn-text);
    cursor: pointer;
    border-radius: 8px;
    font-size: 13px;
    transition: all 0.2s ease, box-shadow 0.2s ease, background 0.2s ease, color 0.2s ease;
    white-space: nowrap;
    box-shadow: 0 2px 4px var(--shadow-light);
}
.ai-btn:hover {
    background-color: var(--btn-hover-bg);
    color: var(--btn-hover-text);
    transform: scale(1.05);
    box-shadow: 0 4px 8px var(--shadow-dark);
}

/* ==========================
   Input & Send Button
   ========================== */
#chat-box input#chat-input {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--input-border);
    border-radius: 6px;
    font-size: 14px;
    background-color: var(--input-bg);
    color: var(--input-text);
    box-sizing: border-box;
    transition: border 0.2s ease, box-shadow 0.2s ease, background 0.2s ease, color 0.2s ease;
}
#chat-box input#chat-input:focus {
    border-color: var(--chat-header-bg);
    box-shadow: 0 0 5px rgba(0,123,255,0.3);
    outline: none;
}
#chat-box button#chat-send-btn {
    background-color: var(--chat-header-bg);
    color: var(--chat-header-text);
    border: none;
    padding: 8px 18px;
    border-radius: 6px;
    font-size: 14px;
    cursor: pointer;
    transition: background 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}
#chat-box button#chat-send-btn:hover {
    background-color: #0056b3;
    transform: scale(1.05);
    box-shadow: 0 4px 10px var(--shadow-dark);
}

/* ==========================
   Responsive Design
   ========================== */
@media (max-width: 500px) {
    #chat-box { width: 90%; right: 5%; bottom: 70px; }
    #chat-messages { max-height: 300px; min-height: 200px; padding: 10px; }
    #chat-box input#chat-input { padding: 9px 10px; font-size: 13px; }
    .ai-btn { font-size: 12px; padding: 5px 10px; }
}
@media (max-width: 360px) {
    #chat-box { width: 95%; right: 2.5%; bottom: 60px; }
    #chat-messages { max-height: 250px; min-height: 180px; }
    #chat-toggle { bottom: 15px; right: 15px; padding: 14px; font-size: 20px; }
}

#chat-box, #chat-messages, #chat-box input, #chat-box button, .ai-btn {
    transition: background 0.3s ease, color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}