:root {
    /* True Black Theme */
    --bg-color: #000000; /* Pure Black */
    --container-bg: #0a0a0a; /* Extremely dark grey */
    --input-bg: #000000; /* Pure Black */
    --user-msg-bg: #1a1a1a; /* Very dark grey for user */
    --assistant-msg-bg: #101010; /* Even darker grey for AI */
    --text-color: #ffffff; /* Slightly lighter grey/off-white text */
    --text-color-darker: #ffffff; /* For less important text */
    --placeholder-color: #404040; /* Darker placeholder text */
    --border-color: #202020; /* Even darker grey border */
    --accent-color-hover: #282828; /* Darker hover for buttons */
    --focus-ring-color: rgba(150, 150, 150, 0.2); /* Even more subtle white focus */
    --error-bg: #1a1a1a; /* Darker grey error background */
    --success-feedback-color: #ffffff; /* White feedback for copy */
    --code-bg: #050505; /* Near black background for code blocks */
    --code-text-color: #c0c0c0; /* Lighter text for code */

    --border-radius-smooth: 8px; /* Slightly reduced radius */
    --border-radius-slight: 4px;
    --font-family: 'DM Sans', sans-serif;
    --transition-speed: 0.15s; /* Slightly faster transitions */
}


@import url('https://fonts.googleapis.com/css2?family=DM+Sans:ital,opsz,wght@0,9..40,100..1000;1,9..40,100..1000&display=swap');

* { box-sizing: border-box; margin: 0; padding: 0; font-family: 'DM Sans', sans-serif; }
html, body { height: 100%; overflow: hidden; background-color: var(--bg-color); }

/* Blob styling */
.blob {
    position: absolute;
    width: 40vw;
    height: 40vw;
    z-index: 0;
    pointer-events: none;
}

/* Main Container */
body {
    display: flex;
    justify-content: center;
    align-items: center;
    color: var(--text-color);
    position: relative;
}

/* Intro Screen Animation */#intro-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: radial-gradient(ellipse at center, #1a1a1a 0%, #080808 100%); /* Subtler gradient */
    color: #e0e0e0; /* Softer white */
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 3.2rem; /* Tiny bit bigger */
    z-index: 9999;
    text-shadow: 0 0 10px rgba(255, 255, 255, 0.8), 0 0 25px rgba(255, 255, 255, 0.4); /* Refined glow */
    letter-spacing: 3px; /* More dramatic */
    transition: opacity 0.6s ease-out, filter 1.2s cubic-bezier(0.175, 0.885, 0.32, 1.275), transform 1.2s cubic-bezier(0.175, 0.885, 0.32, 1.275); /* Smoother, snappier */
    overflow: hidden; /* To contain the pseudo-element animation */
}

#intro-screen h1 {
    position: relative;
    margin: 0;
    padding-bottom: 15px; /* Space for the fancy underline */
}

#intro-screen h1::after {
    content: "";
    position: absolute;
    bottom: 0; /* Moved down */
    left: 15%; /* Starts a bit in */
    width: 70%; /* Wider, more prominent */
    height: 2px; /* Thicker line */
    background: linear-gradient(90deg, rgba(255, 255, 255, 0.1), #ffffff 30%, rgba(255, 255, 255, 0.1)); /* More defined gradient */
    opacity: 0; /* Initially hidden */
    transform: scaleX(0); /* Starts scaled down */
    transition: opacity 0.4s ease-in-out 0.4s, transform 0.6s cubic-bezier(0.68, -0.55, 0.265, 1.55) 0.4s; /* Fancy reveal */
}

/* Chat Container */
.chat-container {
    background-color: var(--container-bg);
    width: 90%;
    height: 90%;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    border-radius: 16px;
    transition: all var(--transition-speed) ease;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.25);
    box-shadow: 0px 0px 100px rgba(255, 255, 255,0.1);
    position: relative;
    z-index: 10;
    border: 1px solid var(--border-color);
}

/* Header Styling */
.chat-header {
    background-color: var(--input-bg);
    padding: 10px 25px;
    border-bottom: 1px solid var(--border-color);
    flex-shrink: 0;
    transition: background-color var(--transition-speed) ease, border-color var(--transition-speed) ease;
    z-index: 10;
}

.header-top-row { 
    display: flex; 
    justify-content: space-between; 
    align-items: center; 
    margin-bottom: 8px; 
}

.chat-header h1 { 
    font-size: 1.1em; 
    font-weight: 500; 
    margin: 0; 
}

.header-button {
    background: none; 
    border: none; 
    color: var(--text-color-darker); 
    cursor: pointer;
    padding: 5px; 
    border-radius: var(--border-radius-slight);
    transition: color var(--transition-speed) ease, background-color var(--transition-speed) ease;
}

.header-button:hover { 
    color: var(--text-color); 
    background-color: var(--accent-color-hover); 
}

.header-bottom-row { 
    display: flex; 
    align-items: center; 
    gap: 8px; 
}

.header-bottom-row label { 
    font-size: 0.85em; 
    color: var(--text-color-darker); 
}

.model-select {
    flex-grow: 1; 
    background-color: var(--container-bg); 
    color: var(--text-color);
    border: 1px solid var(--border-color); 
    border-radius: var(--border-radius-slight);
    padding: 5px 8px; 
    font-size: 0.85em; 
    cursor: pointer;
    transition: border-color var(--transition-speed) ease, background-color var(--transition-speed) ease;
}

.model-select:focus { 
    outline: none; 
    border-color: var(--text-color-darker); 
    background-color: var(--bg-color); 
}

/* Chat Box */
.chat-box {
    flex-grow: 1;
    overflow-y: auto;
    padding: 25px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* Custom Scrollbar */
.chat-box::-webkit-scrollbar { width: 8px; }
.chat-box::-webkit-scrollbar-track { background: var(--container-bg); }
.chat-box::-webkit-scrollbar-thumb { 
    background-color: var(--input-bg); 
    border-radius: 4px; 
    border: 2px solid var(--container-bg); 
}
.chat-box::-webkit-scrollbar-thumb:hover { 
    background-color: var(--accent-color-hover); 
}

/* Message Styling */
.message {
    padding: 14px 20px;
    border-radius: var(--border-radius-smooth);
    max-width: 85%;
    word-wrap: break-word; 
    line-height: 1.6; 
    position: relative;
    transition: background-color var(--transition-speed) ease;
}

.message-content { padding-right: 30px; }

.user-message {
    background-color: var(--user-msg-bg); 
    color: var(--text-color);
    align-self: flex-end; 
    border-bottom-right-radius: var(--border-radius-slight);
}

.assistant-message {
    background-color: var(--assistant-msg-bg); 
    color: var(--text-color);
    align-self: flex-start; 
    border-bottom-left-radius: var(--border-radius-slight);
}

/* Copy Button */
.copy-button {
    position: absolute; 
    top: 8px; 
    right: 8px; 
    background-color: rgba(255, 255, 255, 0.05);
    color: var(--text-color-darker); 
    border: none; 
    border-radius: 4px; 
    padding: 3px 5px;
    cursor: pointer; 
    opacity: 0; 
    transition: opacity var(--transition-speed) ease, background-color var(--transition-speed) ease, color var(--transition-speed) ease;
    display: flex; 
    align-items: center; 
    justify-content: center; 
    z-index: 2;
}

.message:hover .copy-button { opacity: 1; }
.copy-button:hover { 
    background-color: rgba(255, 255, 255, 0.1); 
    color: var(--text-color); 
}
.copy-button.copied svg path { fill: var(--success-feedback-color); }
.copy-button.copied { background-color: rgba(255, 255, 255, 0.08); }

/* Animation for text appearing */
.unblur-token {
    display: inline;
    opacity: 0;
    filter: blur(5px);
    transform: translateY(5px);
    animation: unblurFadeSlide 0.3s ease forwards;
}

/* Keep block elements as block */
p.unblur-token, h1.unblur-token, h2.unblur-token, h3.unblur-token,
div.unblur-token, pre.unblur-token, blockquote.unblur-token,
ul.unblur-token, ol.unblur-token, li.unblur-token {
    display: block; 
}

/* Ensure code elements don't break the flow */
code.unblur-token:not(pre code) {
    display: inline;
}

@keyframes unblurFadeSlide {
    0% {
        opacity: 0;
        filter: blur(5px);
        transform: translateY(5px);
    }
    100% {
        opacity: 1;
        filter: blur(0);
        transform: translateY(0);
    }
}

/* Markdown Content Styling */
.message p { margin-bottom: 0.8em; }
.message p:last-child { margin-bottom: 0; }
.message a { color: var(--text-color); text-decoration: underline; }
.message a:hover { color: var(--text-color-darker); }
.message ul, .message ol { margin-left: 1.5em; margin-bottom: 0.8em; }
.message li { margin-bottom: 0.3em; }
.message h1, .message h2, .message h3, .message h4, .message h5, .message h6 { 
    margin-top: 1em; 
    margin-bottom: 0.5em; 
    font-weight: 600; 
    line-height: 1.3; 
    border-bottom: 1px solid var(--border-color); 
    padding-bottom: 0.2em; 
}
.message h1 { font-size: 1.4em; } 
.message h2 { font-size: 1.3em; } 
.message h3 { font-size: 1.2em; }
.message strong { font-weight: 600; }
.message blockquote { 
    border-left: 3px solid var(--border-color); 
    margin-left: 0; 
    padding-left: 1em; 
    color: var(--text-color-darker); 
    font-style: italic; 
    margin-bottom: 0.8em; 
}
.message hr { 
    border: none; 
    border-top: 1px solid var(--border-color); 
    margin: 1.5em 0; 
}

/* Code Styling */
.message code:not(pre code) { 
    background-color: var(--input-bg); 
    color: var(--code-text-color); 
    padding: 0.2em 0.4em; 
    border-radius: var(--border-radius-slight); 
    font-size: 0.9em; 
    font-family: monospace; 
}

.message pre {
    background-color: var(--code-bg);
    padding: 1em; 
    border-radius: var(--border-radius-slight); 
    overflow-x: auto;
    margin: 0.5em 0 1em 0; 
    font-family: monospace; 
    font-size: 0.9em; 
    line-height: 1.5;
    position: relative; 
    border: 1px solid var(--border-color);
}

.message pre code.hljs {
    display: block;
    overflow-x: auto;
    padding: 0;
    background: transparent;
    color: inherit;
    font-size: inherit;
}

/* Copy Code Button */
.copy-code-button {
    position: absolute; 
    top: 8px; 
    right: 8px; 
    background-color: var(--input-bg);
    color: var(--text-color-darker); 
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-slight); 
    padding: 4px 8px; 
    cursor: pointer;
    font-size: 0.8em; 
    opacity: 0.3;
    transition: opacity var(--transition-speed) ease, background-color var(--transition-speed) ease, color var(--transition-speed) ease;
    display: flex; 
    align-items: center; 
    gap: 4px; 
    z-index: 5;
}

.message pre:hover .copy-code-button { opacity: 1; }
.copy-code-button:hover { 
    background-color: var(--accent-color-hover); 
    color: var(--text-color); 
}
.copy-code-button svg { width: 12px; height: 12px; }
.copy-code-button.copied span { display: none; }
.copy-code-button.copied::after { content: 'Copied!'; font-weight: 500; }
.copy-code-button.copied { 
    color: var(--success-feedback-color); 
    background-color: var(--accent-color-hover); 
}

/* Input Area */
.input-area {
    display: flex; 
    padding: 15px 25px;
    border-top: 1px solid var(--border-color); 
    background-color: var(--input-bg);
    flex-shrink: 0; 
    gap: 10px; 
    align-items: flex-end;
    transition: background-color var(--transition-speed) ease, border-color var(--transition-speed) ease;
}

#user-input {
    flex-grow: 1; 
    background-color: var(--container-bg); 
    color: var(--text-color);
    border: 1px solid var(--border-color); 
    border-radius: var(--border-radius-slight);
    padding: 12px 15px; 
    font-family: var(--font-family); 
    font-size: 1em; 
    resize: none;
    overflow-y: auto; 
    max-height: 120px; 
    line-height: 1.4;
    transition: border-color var(--transition-speed) ease, box-shadow var(--transition-speed) ease, background-color var(--transition-speed) ease;
}

#user-input:focus { 
    outline: none; 
    border-color: var(--text-color-darker); 
    box-shadow: 0 0 0 2px var(--focus-ring-color); 
}

#user-input::placeholder { color: var(--placeholder-color); }

/* Control Buttons */
.control-button {
    background-color: var(--input-bg); 
    color: var(--text-color-darker);
    border: 1px solid var(--border-color); 
    border-radius: var(--border-radius-slight);
    padding: 10px; 
    cursor: pointer; 
    display: flex; 
    justify-content: center; 
    align-items: center;
    transition: background-color var(--transition-speed) ease, transform 0.1s ease, border-color var(--transition-speed) ease, color var(--transition-speed) ease;
    height: 46px; 
    width: 46px; 
    flex-shrink: 0; 
    position: relative; 
    overflow: hidden;
}

.control-button:hover:not(:disabled) { 
    background-color: var(--accent-color-hover); 
    border-color: var(--accent-color-hover); 
    color: var(--text-color); 
}

.control-button:active:not(:disabled) { transform: scale(0.95); }
.control-button:disabled { 
    background-color: var(--container-bg); 
    color: #555; 
    border-color: var(--border-color); 
    cursor: not-allowed; 
}

.send-button .send-icon { transition: opacity var(--transition-speed) ease; }
.send-button .button-spinner { 
    position: absolute; 
    top: 50%; 
    left: 50%; 
    transform: translate(-50%, -50%); 
    width: 20px; 
    height: 20px; 
}

.stop-button { color: var(--error-bg); }
.stop-button:hover:not(:disabled) { 
    background-color: #dc3545; 
    color: white; 
    border-color: #dc3545; 
}

/* Spinner */
.spinner { 
    display: inline-block; 
    width: 1em; 
    height: 1em; 
    border: 2px solid currentColor; 
    border-right-color: transparent; 
    border-radius: 50%; 
    animation: spinner-border .75s linear infinite; 
    vertical-align: middle; 
}

.button-spinner { 
    width: 20px; 
    height: 20px; 
    border-width: 3px; 
    color: var(--text-color); 
}

@keyframes spinner-border { to { transform: rotate(360deg); } }

/* Error Message */
.error-message { 
    background-color: var(--error-bg); 
    color: #ffcccc; 
    border: 1px solid #600; 
}

.error-message .copy-button { 
    background-color: rgba(255, 100, 100, 0.1); 
    color: #ffcccc; 
}

.error-message .copy-button:hover { 
    background-color: rgba(255, 100, 100, 0.2); 
    color: #ffe0e0; 
}

/* Modal Styling */
.modal-overlay { 
    position: fixed; 
    inset: 0; 
    background-color: rgba(0, 0, 0, 0.8); 
    display: flex; 
    justify-content: center; 
    align-items: center; 
    z-index: 1000; 
    opacity: 0; 
    transition: opacity var(--transition-speed) ease; 
}

.modal-overlay.visible { opacity: 1; }

.modal-content { 
    background-color: var(--input-bg); 
    padding: 25px 30px; 
    border-radius: var(--border-radius-smooth); 
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3); 
    width: 90%; 
    max-width: 400px; 
    text-align: center; 
    transform: scale(0.95); 
    transition: transform var(--transition-speed) ease; 
    border: 1px solid var(--border-color); 
}

.modal-overlay.visible .modal-content { transform: scale(1); }

.modal-content h4 { 
    margin-bottom: 10px; 
    font-size: 1.2em; 
    font-weight: 500; 
}

.modal-content p { 
    margin-bottom: 20px; 
    color: var(--text-color-darker); 
    font-size: 0.95em; 
    line-height: 1.5; 
}

.modal-buttons { 
    display: flex; 
    justify-content: center; 
    gap: 15px; 
}

.modal-button { 
    padding: 10px 20px; 
    border-radius: var(--border-radius-slight); 
    border: 1px solid var(--border-color); 
    cursor: pointer; 
    font-weight: 500; 
    transition: background-color var(--transition-speed) ease, transform 0.1s ease; 
}

.modal-button.confirm { 
    background-color: #b00; 
    color: white; 
    border-color: #800; 
}

.modal-button.confirm:hover { background-color: #d00; }

.modal-button.cancel { 
    background-color: var(--assistant-msg-bg); 
    color: var(--text-color); 
}

.modal-button.cancel:hover { background-color: var(--accent-color-hover); }
.modal-button:active { transform: scale(0.97); }

/* Glow Effects */
.text-gradient {
    background: linear-gradient(90deg, #fff, #aaa);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-title-glow {
    text-shadow: 0 0 10px rgba(255, 255, 255, 0.3);
}

.hero-subtitle-glow {
    text-shadow: 0 0 5px rgba(255, 255, 255, 0.2);
}

.button-glow {
    box-shadow: 0 0 15px rgba(255, 255, 255, 0.1);
}

.hero-card-glow {
    box-shadow: 0 5px 20px rgba(255, 255, 255, 0.05);
}

.card-item-glow {
    box-shadow: 0 2px 8px rgba(255, 255, 255, 0.03);
}

/* Animations */
@keyframes float {
    0% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
    100% { transform: translateY(0); }
}

.animate-float {
    animation: float 6s ease-in-out infinite;
}

@keyframes scale-in {
    from { transform: scale(0.9); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}

.animate-scale-in {
    animation: scale-in 0.5s ease-out forwards;
}

@keyframes fade-in-up {
    from { transform: translateY(20px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

.animate-fade-in-up {
    animation: fade-in-up 0.5s ease-out forwards;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .chat-container {
        width: 100%;
        height: 100%;
        border-radius: 0;
    }
    
    .message {
        max-width: 90%;
    }
    
    .chat-header, .input-area {
        padding: 10px 15px;
    }
    
    .chat-box {
        padding: 15px;
    }
}
        .inverted {
            filter: invert(1);
        }

        #invert-btn {
            position: fixed;
            bottom: 20px;
            right: 20px;
            padding: 10px; /* Removed text, increased padding */
            background: transparent; /* Make background transparent */
            border: none; /* Remove border */
            cursor: pointer;
            z-index: 9999;
            width: 40px; /* Increased size for icons */
            height: 40px;
            display: flex; /* Use flexbox for centering */
            align-items: center;
            justify-content: center;
        }

        #invert-btn svg {
            width: 80%; /* Increased size of SVG inside the button */
            height: 80%;
        }

        .sun {
            color: #FFD700; /* Gold for sun */
        }

        .moon {
            color: #C0C0C0; /* Silver for moon */
        }
        
        /* User information styles */
        .user-info {
            position: absolute;
            top: 10px;
            right: 20px;
            display: flex;
            align-items: center;
            gap: 10px;
            color: #fff;
            font-size: 14px;
        }
        
        .user-avatar {
            width: 30px;
            height: 30px;
            border-radius: 50%;
            background: #333;
            display: flex;
            align-items: center;
            justify-content: center;
            border: 1px solid #fff;
        }
        
        .logout-btn {
            background: transparent;
            color: #fff;
            border: 1px solid #fff;
            border-radius: 4px;
            padding: 2px 8px;
            font-size: 12px;
            cursor: pointer;
            transition: all 0.3s ease;
        }
        
        .logout-btn:hover {
            background: rgba(255, 255, 255, 0.1);
            box-shadow: 0 0 8px rgba(255, 255, 255, 0.5);
        }