/* --- Nova AI v2.2: Vibrant & Interactive UI --- */

:root {
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --bg-deep-space: #0D0F17;
    --bg-space: #1A1D2D;
    --bg-sidebar: #131520;
    --text-primary: #E5E7EB;
    --text-secondary: #9CA3AF;
    --accent-glow: #C084FC; /* Purple */
    --accent-calm: #60A5FA; /* Blue */
    --accent-gradient: linear-gradient(45deg, var(--accent-glow), var(--accent-calm));
    --sidebar-width: 280px;
}

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

body {
    font-family: var(--font-sans);
    background-color: var(--bg-deep-space);
    color: var(--text-primary);
    overflow: hidden;
    height: 100vh;
    width: 100vw;
    background-image: radial-gradient(at 20% 20%, hsla(250,50%,20%,0.3) 0px, transparent 50%),
                      radial-gradient(at 80% 20%, hsla(210,50%,20%,0.3) 0px, transparent 50%),
                      radial-gradient(at 20% 80%, hsla(280,50%,20%,0.3) 0px, transparent 50%),
                      radial-gradient(at 80% 80%, hsla(230,50%,20%,0.3) 0px, transparent 50%);
}

/* --- SLIDABLE SIDEBAR & OVERLAY --- */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: var(--sidebar-width);
    height: 100%;
    background: var(--bg-sidebar);
    display: flex;
    flex-direction: column;
    z-index: 1000;
    transform: translateX(-100%);
    transition: transform 0.3s ease-in-out;
    box-shadow: 5px 0 25px rgba(0,0,0,0.3);
}
#sidebar-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease-in-out, visibility 0.3s;
}
body.sidebar-open .sidebar {
    transform: translateX(0);
}
body.sidebar-open #sidebar-overlay {
    opacity: 1;
    visibility: visible;
}
body.sidebar-open .app-container {
    transform: translateX(var(--sidebar-width));
}

/* --- MAIN APP CONTAINER --- */
.app-container {
    height: 100vh;
    width: 100vw;
    transition: transform 0.3s ease-in-out;
}
.chat-container {
    display: flex;
    flex-direction: column;
    background: var(--bg-space);
    height: 100%;
}

/* --- HEADER & MENU BUTTON --- */
.main-header {
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 1.5rem;
    position: relative;
    border-bottom: 1px solid #272A38;
}
.menu-toggle-btn {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 50%;
    transition: all 0.2s;
    text-shadow: 0 0 5px rgba(96, 165, 250, 0.5);
}
.menu-toggle-btn svg {
    width: 24px;
    height: 24px;
    fill: currentColor;
}
.menu-toggle-btn:hover {
    color: var(--text-primary);
    background-color: rgba(255,255,255,0.1);
    text-shadow: 0 0 12px var(--accent-calm);
}
.logo {
    font-size: 1.5rem;
    font-weight: 500;
    letter-spacing: 2px;
}
.logo span {
    font-weight: 600;
    color: var(--accent-glow);
}

/* --- SIDEBAR CONTENT --- */
.sidebar-header, .sidebar-footer {
    padding: 1rem;
    flex-shrink: 0;
}
.new-chat-btn, .clear-all-btn {
    width: 100%;
    padding: 0.75rem;
    background: rgba(255,255,255,0.05);
    border: 1px solid transparent;
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    transition: all 0.2s ease;
}
.new-chat-btn:hover, .clear-all-btn:hover {
    background: rgba(255,255,255,0.1);
    border-color: rgba(255,255,255,0.2);
}
.chat-history {
    flex-grow: 1;
    overflow-y: auto;
    padding: 0 1rem;
}
#chat-history-list {
    list-style: none;
}
.chat-history-item {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem;
    border-radius: 6px;
    cursor: pointer;
    transition: background-color 0.2s ease;
}
.chat-history-item:hover {
    background-color: rgba(255,255,255,0.05);
}
.chat-history-item.active {
    background-color: rgba(96, 165, 250, 0.15);
}
.chat-title {
    flex-grow: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    font-size: 0.9rem;
    padding-right: 1rem;
}
.chat-actions {
    display: none;
}
.chat-history-item:hover .chat-actions {
    display: flex;
    gap: 0.5rem;
}
.chat-actions button {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.25rem;
    opacity: 0.7;
    transition: all 0.2s;
}
.chat-actions button:hover {
    color: var(--text-primary);
    opacity: 1;
    transform: scale(1.1);
}

/* --- CORE CHAT UI --- */
.chat-area-content {
    flex-grow: 1;
    overflow-y: auto;
    position: relative;
}
.chat-messages {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    padding: 1.5rem 2rem;
    max-width: 900px;
    margin: 0 auto;
    width: 100%;
}
#welcome-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    padding: 2rem;
    text-align: center;
}
#welcome-container .logo {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
}
.suggestion-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    width: 100%;
    max-width: 600px;
    margin-top: 2rem;
}
.suggestion-card {
    background: var(--bg-deep-space);
    border: 1px solid #272A38;
    padding: 1rem;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.2s ease-in-out;
    text-align: left;
}
.suggestion-card:hover {
    transform: translateY(-4px);
    border-color: var(--accent-calm);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.2);
}
.suggestion-card h3 {
    font-size: 1rem;
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.suggestion-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
}
.message {
    width: 100%;
    line-height: 1.7;
    display: flex;
    gap: 1rem;
    align-items: flex-start;
    animation: fadeIn 0.5s ease-out forwards;
}
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(15px); }
    to { opacity: 1; transform: translateY(0); }
}
.message .avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    background-color: var(--bg-deep-space);
}
.message.user .avatar {
    background: linear-gradient(135deg, var(--accent-calm), var(--accent-glow));
}
.message .content {
    padding-top: 0.5rem;
    flex-grow: 1;
}
.message.ai .content {
    padding: 1rem 1.5rem;
    background: var(--bg-deep-space);
    border-radius: 12px;
    border: 1px solid #272A38;
    border-top: 2px solid;
    border-image-slice: 1;
    border-image-source: linear-gradient(to right, var(--accent-glow), var(--accent-calm));
}
.content pre {
    background-color: #010409;
    border-radius: 8px;
    padding: 1rem;
    font-family: 'Fira Code', 'Courier New', monospace;
    font-size: 0.9rem;
    white-space: pre-wrap;
    word-wrap: break-word;
    position: relative;
    margin-top: 1rem;
}
.content code {
    font-family: 'Fira Code', 'Courier New', monospace;
    background-color: rgba(0,0,0,0.3);
    padding: 0.2em 0.4em;
    border-radius: 4px;
}
.content pre code {
    background-color: transparent;
    padding: 0;
}
.copy-code-btn {
    position: absolute;
    top: 8px;
    right: 8px;
    background: #333;
    color: white;
    border: none;
    padding: 0.3rem 0.6rem;
    border-radius: 5px;
    cursor: pointer;
    opacity: 0;
    transition: opacity 0.2s;
    font-size: 0.8rem;
}
.content pre:hover .copy-code-btn {
    opacity: 1;
}
.content ul, .content ol {
    padding-left: 1.5rem;
    margin-top: 0.5rem;
}
.content p:not(:last-child) {
    margin-bottom: 1rem;
}
.image-wrapper {
    position: relative;
    max-width: 512px;
    margin-top: 0.5rem;
    border-radius: 8px;
    overflow: hidden;
}
.image-wrapper img {
    display: block;
    max-width: 100%;
}
.download-btn {
    position: absolute;
    top: 10px;
    right: 10px;
    width: 40px;
    height: 40px;
    background: rgba(0, 0, 0, 0.6);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    font-size: 1.2rem;
    opacity: 0;
    transition: opacity 0.2s ease-in-out;
    cursor: pointer;
}
.image-wrapper:hover .download-btn {
    opacity: 1;
}
.ai-status-container {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 0.5rem 0;
    gap: 1rem;
}
.typing-indicator {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
}
.typing-indicator .dots span {
    width: 6px;
    height: 6px;
    margin: 0 2px;
    background: var(--text-secondary);
    border-radius: 50%;
    display: inline-block;
    animation: pulse-dots 1.4s infinite ease-in-out both;
}
.typing-indicator .dots span:nth-child(2) { animation-delay: 0.2s; }
.typing-indicator .dots span:nth-child(3) { animation-delay: 0.4s; }
@keyframes pulse-dots {
    0%, 80%, 100% { transform: scale(0); }
    40% { transform: scale(1.0); }
}
.stop-generating-btn {
    background: #374151;
    color: var(--text-primary);
    border: 1px solid #4B5563;
    border-radius: 6px;
    padding: 0.4rem 0.8rem;
    font-size: 0.8rem;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.4rem;
    transition: background-color 0.2s;
}
.stop-generating-btn:hover { background: #4B5563; }

/* --- VIBRANT INPUT AREA --- */
.chat-input-area {
    padding: 1rem 2rem;
    border-top: 1px solid #272A38;
    z-index: 1;
    max-width: 900px;
    width: 100%;
    margin: 0 auto;
    display: flex;
    align-items: flex-end;
    gap: 0.5rem;
}
.input-wrapper {
    flex-grow: 1;
    display: flex;
    align-items: center;
    background-color: var(--bg-deep-space);
    border-radius: 12px;
    padding: 0.5rem 0.5rem 0.5rem 1rem;
    position: relative;
}
.input-wrapper::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 12px;
    padding: 1px;
    background: linear-gradient(45deg, var(--accent-calm), #272A38, #272A38);
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    transition: all 0.3s;
    opacity: 0.7;
}
.input-wrapper:focus-within::before {
    opacity: 1;
    animation: pulse-border 2s infinite;
}
@keyframes pulse-border {
    0% { background: linear-gradient(45deg, var(--accent-glow), var(--accent-calm)); }
    50% { background: linear-gradient(45deg, var(--accent-calm), var(--accent-glow)); }
    100% { background: linear-gradient(45deg, var(--accent-glow), var(--accent-calm)); }
}

#chat-input {
    flex-grow: 1;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 1rem;
    resize: none;
    max-height: 200px;
    line-height: 1.5;
    outline: none;
    z-index: 2;
}
.mic-send-btn {
    width: 36px;
    height: 36px;
    border-radius: 8px;
    border: none;
    background: var(--accent-calm);
    color: white;
    font-size: 1.2rem;
    cursor: pointer;
    display: grid;
    place-items: center;
    flex-shrink: 0;
    transition: all 0.3s;
    z-index: 2;
}
.mic-icon, .send-icon {
    grid-area: 1 / 1;
    transition: opacity 0.2s, transform 0.2s;
}
.send-icon {
    opacity: 0;
    transform: scale(0.5);
}
#chat-input:not(:placeholder-shown) + .mic-send-btn {
    background: var(--accent-gradient);
    animation: pulse-send-btn 2s infinite;
}
#chat-input:not(:placeholder-shown) + .mic-send-btn .mic-icon {
    opacity: 0;
    transform: scale(0.5);
}
#chat-input:not(:placeholder-shown) + .mic-send-btn .send-icon {
    opacity: 1;
    transform: scale(1);
}
@keyframes pulse-send-btn {
    0% { box-shadow: 0 0 0 0 rgba(192, 132, 252, 0.4); }
    70% { box-shadow: 0 0 0 8px rgba(192, 132, 252, 0); }
    100% { box-shadow: 0 0 0 0 rgba(192, 132, 252, 0); }
}

.mode-toggle {
    width: 44px;
    height: 44px;
    background: transparent;
    border: none;
    font-size: 1.5rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s;
    text-shadow: 0 0 5px rgba(96, 165, 250, 0.5);
}
.mode-toggle:hover {
    color: var(--text-primary);
    text-shadow: 0 0 12px var(--accent-calm);
}

/* --- FOOTER & SCROLLBAR --- */
.main-footer-tagline {
    text-align: center;
    padding: 0.75rem;
    font-size: 0.8rem;
    color: var(--text-secondary);
}
::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: #272A38;
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: #374151;
}

/* --- RESPONSIVE DESIGN --- */
@media (max-width: 768px) {
    body.sidebar-open .app-container {
        transform: translateX(0); /* Don't push content on mobile */
    }
    .sidebar {
        max-width: 85%;
    }
    .chat-messages, .chat-input-area {
        padding: 1rem;
    }
    .suggestion-grid {
        grid-template-columns: 1fr;
    }
    .main-header {
        padding-left: 4rem; /* Make space for menu button */
    }
}