/* --- Global Setup & Fonts --- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;700&display=swap');
@import url('https://fonts.googleapis.com/icon?family=Material+Icons+Outlined');

:root {
    --primary-color: #3B5998;
    --background-color: #121212;
    --card-bg-color: #1E1E1E;
    --border-color: #2C2C2C;
    --user-msg-bg: #3B5998;
    --bot-msg-bg: #2A2A2A;
    --text-color: #EAEAEA;
    --text-muted: #8E8E93;
}

body {
    font-family: 'Inter', sans-serif;
    margin: 0;
    background: var(--background-color) url('https://miro.medium.com/v2/resize:fit:1400/1*ADTdNBw3fFnGFeg81UBKjw.gif') no-repeat center center fixed;
    background-size: cover;
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    overflow: hidden; /* Prevent body scroll */
}

/* --- Main Layout --- */
.chat-window {
    width: 100%;
    max-width: 800px;
    height: 100%; /* Full height on mobile */
    background: var(--card-bg-color);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    display: flex; /* FIX: Use flexbox for layout */
    flex-direction: column; /* FIX: Stack children vertically */
    transition: all 0.3s ease;
    overflow: hidden; /* FIX: Prevent internal content from spilling out */
}

@media (min-width: 800px) {
    .chat-window {
        height: 90vh;
        border-radius: 9px;
    }
}

/* --- Home Screen / Initial View --- */
.home-screen {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 40px;
    flex-grow: 1; /* Takes up available space */
}
.home-screen.hidden, .chat-view.hidden {
    display: none;
}
.home-screen h1 { font-size: 2.5rem; margin-bottom: 8px; }
.home-screen p { font-size: 1.1rem; color: var(--text-muted); margin-bottom: 40px; }
.suggestion-cards { display: flex; gap: 15px; flex-wrap: wrap; justify-content: center; }
.suggestion-card {
    background: var(--bot-msg-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 20px;
    width: 180px;
    text-align: left;
    cursor: pointer;
    transition: all 0.2s ease;
}
.suggestion-card:hover { transform: translateY(-5px); border-color: var(--primary-color); }
.suggestion-card .material-icons-outlined { font-size: 2rem; color: var(--primary-color); margin-bottom: 10px; }
.suggestion-card h3 { margin: 0; font-size: 1rem; }


/* --- FIX: Chat View Layout --- */
.chat-view {
    flex-grow: 1; /* Takes all available vertical space */
    display: flex;
    flex-direction: column;
    overflow: hidden; /* Important for containing the scrolling area */
}

.chat-container {
    flex-grow: 1; /* Allows this to fill space */
    padding: 20px;
    overflow-y: auto; /* Enables scrolling for messages */
    display: flex;
    flex-direction: column;
    gap: 15px;
    /* FIX: Add padding at the bottom to ensure the last message isn't hidden by the input area */
    padding-bottom: 30px; 
}


/* --- Chat Messages --- */
.chat-message {
    padding: 12px 18px;
    max-width: 80%;
    word-wrap: break-word;
    opacity: 0;
    transform: translateY(10px);
    animation: slide-fade-in 0.3s ease forwards;
}
@keyframes slide-fade-in {
    to { opacity: 1; transform: translateY(0); }
}
.user-message {
    background-color: var(--user-msg-bg);
    color: white;
    align-self: flex-end;
    border-radius: 12px 12px 4px 12px;
}
.bot-message {
    background-color: var(--bot-msg-bg);
    color: var(--text-color);
    align-self: flex-start;
    border: 1px solid var(--border-color);
    border-radius: 12px 12px 12px 4px;
}
.bot-message.error { background-color: rgba(217, 48, 37, 0.2); border-color: #D93025; }
.bot-message.thinking::after { content: '▋'; animation: blink 1s infinite; display: inline-block; margin-left: 5px; }
@keyframes blink { 50% { opacity: 0; } }

/* Markdown Styles */
.bot-message h1, .bot-message h2, .bot-message h3 { margin-top: 0.5em; margin-bottom: 0.5em; }
.bot-message p { margin: 0.5em 0; }
.bot-message ul, .bot-message ol { padding-left: 20px; }
.bot-message li { margin-bottom: 0.25em; }
.bot-message a { color: var(--primary-color); text-decoration: none; }
.bot-message a:hover { text-decoration: underline; }
.bot-message code { background-color: #111; padding: 2px 5px; border-radius: 4px; font-family: 'Courier New', Courier, monospace; }
.bot-message pre { background-color: #0d0d0d; padding: 15px; border-radius: 8px; overflow-x: auto; white-space: pre-wrap; border: 1px solid var(--border-color); }
.bot-message pre code { background-color: transparent; padding: 0; }


/* --- Input Area --- */
.input-area {
    /* FIX: No sticky positioning needed here with the new flexbox structure */
    /* It will naturally sit at the bottom */
    padding: 10px 15px;
    border-top: 1px solid var(--border-color);
    background-color: var(--card-bg-color);
    flex-shrink: 0; /* Prevents the input area from shrinking */
}

#chat-form { display: flex; flex-direction: column; gap: 10px; }

/* Attachment Preview Chip */
#attachment-preview {
    display: inline-flex; /* Use inline-flex to be compact */
    align-items: center;
    gap: 8px;
    background: var(--bot-msg-bg);
    border: 1px solid var(--border-color);
    padding: 5px 10px;
    border-radius: 20px;
    max-width: fit-content;
    animation: scale-in 0.2s ease;
}
@keyframes scale-in { from { opacity: 0; transform: scale(0.9); } to { opacity: 1; transform: scale(1); } }
#attachment-preview .filename { font-size: 0.9rem; }
#remove-attachment-btn { cursor: pointer; display: flex; align-items: center; }

/* Input Controls & Bar */
.input-controls { display: flex; justify-content: flex-end; align-items: center; padding: 0 5px; }
.search-toggle-container { display: flex; align-items: center; gap: 8px; font-size: 14px; color: var(--text-muted); }
.toggle-switch { position: relative; display: inline-block; width: 40px; height: 22px; }
.toggle-switch input { opacity: 0; width: 0; height: 0; }
.slider { position: absolute; cursor: pointer; top: 0; left: 0; right: 0; bottom: 0; background-color: #ccc; transition: .4s; border-radius: 22px; }
.slider:before { position: absolute; content: ""; height: 16px; width: 16px; left: 3px; bottom: 3px; background-color: white; transition: .4s; border-radius: 50%; }
input:checked + .slider { background-color: var(--primary-color); }
input:checked + .slider:before { transform: translateX(18px); }

.input-bar { display: flex; align-items: flex-end; gap: 10px; }
#prompt-input {
    flex-grow: 1;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 10px 15px;
    font-size: 1rem;
    color: var(--text-color);
    resize: none;
    max-height: 120px; /* Limit growth */
    overflow-y: auto; /* Add scroll if it gets too big */
    transition: border-color 0.2s, box-shadow 0.2s;
}
#prompt-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 89, 152, 0.3);
}

.icon-btn {
    border: none;
    background: none;
    padding: 8px;
    cursor: pointer;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    transition: all 0.2s ease;
    flex-shrink: 0; /* Prevent icons from shrinking */
}
.icon-btn:hover { color: var(--text-color); background-color: rgba(255, 255, 255, 0.1); }
.icon-btn:disabled { cursor: not-allowed; opacity: 0.4; pointer-events: none; background: none !important; }
#send-btn { background-color: var(--primary-color); color: white; }
#send-btn:hover { background-color: #4a69ad; }