:root {
    /* Premium Light Theme */
    --bg-main: #fcfcfd;
    --bg-sidebar: #f2f3f7;
    --text-primary: #5b32d1;
    --text-color: #1c1c21;
    --text-muted: #6b6b7b;
    --border-color: #e4e5eb;
    
    --chat-user-bg: #eceafe;
    --chat-user-text: #2f275e;
    --chat-ai-bg: #ffffff;
    
    --input-bg: #ffffff;
    --input-border: #e4e5eb;
    --input-shadow: 0 4px 16px rgba(0, 0, 0, 0.04);
    
    --btn-hover: #e8e9ef;
    --highlight: #6e41e2;
    --highlight-hover: #5b32d1;
    
    --sidebar-width: 280px;
    --font-heading: 'Outfit', 'Inter', sans-serif;
}

[data-theme="dark"] {
    /* Premium Dark Theme */
    --bg-main: #14151a;
    --bg-sidebar: #0f1014;
    --text-color: #f1f1f4;
    --text-muted: #8b8e9b;
    --border-color: #262831;
    
    --chat-user-bg: #2a2542;
    --chat-user-text: #e1def5;
    --chat-ai-bg: #1c1d24;
    
    --input-bg: #1c1d24;
    --input-border: #2d2f39;
    --input-shadow: 0 4px 24px rgba(0,0,0,0.25);
    
    --btn-hover: #262831;
    --highlight: #7c51f0;
    --highlight-hover: #9674f7;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}
::-webkit-scrollbar-track {
    background: transparent; 
}
::-webkit-scrollbar-thumb {
    background: var(--border-color); 
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted); 
}

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

body, html {
    font-family: 'Inter', system-ui, sans-serif;
    background-color: var(--bg-main);
    color: var(--text-color);
    height: 100vh;
    overflow: hidden;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.app-container {
    display: flex;
    height: 100vh;
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background-color: var(--bg-sidebar);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 100;
}

.sidebar-header {
    padding: 1.5rem 1rem;
}

.new-chat-btn {
    width: 100%;
    padding: 0.85rem;
    background: linear-gradient(135deg, var(--highlight), var(--highlight-hover));
    border: none;
    border-radius: 0.5rem;
    color: #ffffff;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-size: 0.95rem;
    font-weight: 500;
    box-shadow: 0 4px 12px rgba(124, 81, 240, 0.3);
    transition: transform 0.2s, box-shadow 0.2s;
}

.new-chat-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(124, 81, 240, 0.4);
}

.new-chat-btn:active {
    transform: translateY(0);
}

.chat-history-list {
    flex: 1;
    overflow-y: auto;
    padding: 0 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.chat-item {
    padding: 0.75rem 0.85rem;
    border-radius: 0.5rem;
    cursor: pointer;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--text-color);
    transition: background-color 0.2s ease, transform 0.1s;
    user-select: none;
}

.chat-title-text {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    flex: 1;
}

.chat-item i {
    color: var(--text-muted);
}

.chat-item:hover {
    background-color: var(--btn-hover);
}

.chat-item.active {
    background-color: var(--btn-hover);
    font-weight: 500;
}
.chat-item.active i {
    color: var(--highlight);
}

.sidebar-footer {
    padding: 1rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-around;
    background-color: var(--bg-sidebar);
}

.action-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0.6rem;
    border-radius: 0.5rem;
    font-size: 1.15rem;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.action-btn:hover {
    background-color: rgba(124, 81, 240, 0.1);
    color: var(--highlight);
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    height: 100%;
    position: relative;
    width: calc(100% - var(--sidebar-width));
}

.chat-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.25rem 2rem;
    background: rgba(var(--bg-main), 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 10;
}

.menu-btn {
    background: none;
    border: none;
    color: var(--text-color);
    cursor: pointer;
    font-size: 1.25rem;
    display: none;
}

#current-chat-title {
    font-size: 1.1rem;
    font-weight: 600;
    font-family: var(--font-heading);
    letter-spacing: -0.01em;
}

.chat-container {
    flex: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    scroll-behavior: smooth;
    padding-bottom: 2rem;
}

.welcome-screen {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 2rem;
    animation: fadeIn 0.6s ease-out;
}

.welcome-icon {
    font-size: 3.5rem;
    color: var(--highlight);
    margin-bottom: 1.5rem;
    filter: drop-shadow(0 0 20px rgba(124, 81, 240, 0.3));
}

.welcome-screen h1 {
    font-family: var(--font-heading);
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    background: linear-gradient(135deg, var(--text-color), var(--text-muted));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.messages-wrapper {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    padding: 2rem;
    max-width: 900px;
    margin: 0 auto;
    width: 100%;
}

.message {
    display: flex;
    width: 100%;
    animation: slideUp 0.4s cubic-bezier(0.2, 0.8, 0.2, 1) both;
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(15px); }
    to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.message-inner {
    display: flex;
    gap: 1rem;
    width: 100%;
}

.message.user {
    justify-content: flex-end;
}
.message.assistant {
    justify-content: flex-start;
}

.message.user .message-inner {
    flex-direction: row-reverse;
}

.avatar {
    width: 36px;
    height: 36px;
    border-radius: 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    color: white;
    flex-shrink: 0;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
}

.user .avatar {
    background: linear-gradient(135deg, #10b981, #059669);
}

.assistant .avatar {
    background: linear-gradient(135deg, var(--highlight), var(--highlight-hover));
}

.message-content {
    max-width: 80%;
    line-height: 1.6;
    padding: 1.25rem;
    border-radius: 1rem;
    position: relative;
}

.user .message-content {
    background-color: var(--chat-user-bg);
    color: var(--chat-user-text);
    border-top-right-radius: 0.25rem;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

.assistant .message-content {
    background-color: var(--chat-ai-bg);
    border: 1px solid var(--border-color);
    border-top-left-radius: 0.25rem;
    box-shadow: var(--input-shadow);
}

.message-content p {
    margin-bottom: 0.85rem;
}
.message-content p:last-child {
    margin-bottom: 0;
}

.message-content pre {
    background-color: #0d0d12 !important;
    padding: 1.25rem;
    border-radius: 0.5rem;
    overflow-x: auto;
    margin: 1rem 0;
    border: 1px solid #262831;
}

.message-content code {
    font-family: 'JetBrains Mono', Consolas, Monaco, monospace;
    font-size: 0.85em;
    color: #e1def5;
}

.message-content p > code {
    background-color: rgba(124, 81, 240, 0.15);
    color: var(--highlight);
    padding: 0.2rem 0.4rem;
    border-radius: 0.25rem;
}

.message-actions {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-top: 0.5rem;
    opacity: 0;
    transition: opacity 0.2s;
    align-items: center;
}

.message:hover .message-actions {
    opacity: 1;
}

.copy-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0.4rem;
    border-radius: 0.25rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.copy-btn:hover {
    color: var(--text-primary);
    background-color: var(--btn-hover);
}

.timestamp {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 0.5rem;
    display: block;
}
.user .timestamp {
    text-align: right;
}

/* Typing Indicator */
.typing-indicator {
    padding: 1.5rem 2rem;
    display: flex;
    align-items: center;
    gap: 0.4rem;
    max-width: 900px;
    margin: 0 auto;
    width: 100%;
}

.typing-indicator.hidden {
    display: none;
}

.typing-indicator span {
    width: 6px;
    height: 6px;
    background-color: var(--highlight);
    border-radius: 50%;
    animation: typing 1.4s infinite ease-in-out both;
}
.typing-indicator span:nth-child(1) { animation-delay: -0.32s; }
.typing-indicator span:nth-child(2) { animation-delay: -0.16s; }

@keyframes typing {
    0%, 80%, 100% { transform: scale(0); opacity: 0.4; }
    40% { transform: scale(1); opacity: 1; }
}

/* Input Area */
.input-area {
    padding: 1.5rem 2rem;
    background: linear-gradient(0deg, var(--bg-main) 70%, rgba(0,0,0,0));
    position: relative;
    z-index: 10;
}

.input-wrapper {
    max-width: 800px;
    margin: 0 auto;
    background-color: var(--input-bg);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    display: flex;
    align-items: flex-end;
    padding: 0.5rem 0.5rem 0.5rem 1.25rem;
    box-shadow: var(--input-shadow);
    transition: border-color 0.3s, box-shadow 0.3s;
}

.input-wrapper:focus-within {
    border-color: var(--highlight);
    box-shadow: 0 4px 20px rgba(124, 81, 240, 0.15);
}

textarea {
    flex: 1;
    background: none;
    border: none;
    color: var(--text-color);
    font-family: inherit;
    font-size: 1rem;
    line-height: 1.5;
    resize: none;
    max-height: 200px;
    padding: 0.75rem 0;
    outline: none;
}
textarea::placeholder {
    color: var(--text-muted);
}

.send-btn, .voice-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    border-radius: 0.5rem;
    padding: 0.75rem;
    margin-left: 0.25rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.send-btn:hover, .voice-btn:hover {
    background-color: var(--btn-hover);
    color: var(--text-color);
}
.send-btn.active {
    color: white;
    background-color: var(--highlight);
}
.send-btn.active:hover {
    background-color: var(--highlight-hover);
}
.voice-btn.recording {
    color: #ef4444;
    background-color: rgba(239, 68, 68, 0.1);
    animation: pulse 1.5s infinite;
}

@keyframes pulse {
    0% { transform: scale(1); box-shadow: 0 0 0 0 rgba(239, 68, 68, 0.4); }
    70% { transform: scale(1.05); box-shadow: 0 0 0 10px rgba(239, 68, 68, 0); }
    100% { transform: scale(1); box-shadow: 0 0 0 0 rgba(239, 68, 68, 0); }
}

.input-footer {
    text-align: center;
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 1rem;
}

/* Context Menu */
.context-menu {
    position: fixed;
    background: var(--input-bg);
    border: 1px solid var(--border-color);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
    border-radius: 0.5rem;
    padding: 0.4rem;
    display: none;
    flex-direction: column;
    z-index: 2000;
    min-width: 160px;
}
.context-menu.active {
    display: flex;
    animation: fadeIn 0.15s ease-out;
}
.context-item {
    padding: 0.6rem 0.8rem;
    border-radius: 0.35rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-color);
    transition: background-color 0.15s;
}
.context-item:hover {
    background: var(--btn-hover);
}
.context-item.context-danger {
    color: #ef4444;
}
.context-item.context-danger:hover {
    background: rgba(239, 68, 68, 0.1);
}

/* Modal Setting Styles from before but updated for premium feel */
.modal-overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}
.modal-overlay.active { display: flex; animation: fadeIn 0.2s ease-out; }
.modal {
    background-color: var(--bg-main);
    width: 90%;
    max-width: 440px;
    border-radius: 1rem;
    box-shadow: 0 20px 40px rgba(0,0,0,0.3);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    border: 1px solid var(--border-color);
    animation: slideUp 0.3s cubic-bezier(0.2, 0.8, 0.2, 1);
}
.modal-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex; justify-content: space-between; align-items: center;
}
.modal-header h3 { font-family: var(--font-heading); font-size: 1.2rem; }
.close-btn { background: none; border: none; color: var(--text-muted); cursor: pointer; font-size: 1.25rem; }
.close-btn:hover { color: var(--text-color); }
.modal-body { padding: 1.5rem; display: flex; flex-direction: column; gap: 1.25rem; }
.form-group { display: flex; flex-direction: column; gap: 0.5rem; }
.form-group label { font-size: 0.85rem; font-weight: 600; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.05em; }
.form-group select, .form-group input {
    padding: 0.75rem 1rem; border-radius: 0.5rem; border: 1px solid var(--border-color);
    background-color: var(--input-bg); color: var(--text-color); font-family: inherit; font-size: 0.95rem; outline: none; transition: border-color 0.2s;
}
.form-group select:focus, .form-group input:focus { border-color: var(--highlight); }
.modal-footer {
    padding: 1.25rem 1.5rem; border-top: 1px solid var(--border-color); display: flex; justify-content: flex-end; background-color: var(--bg-sidebar);
}
.save-settings-btn {
    padding: 0.75rem 1.5rem; background: linear-gradient(135deg, var(--highlight), var(--highlight-hover)); color: white; border: none; border-radius: 0.5rem; cursor: pointer; font-weight: 500; transition: transform 0.2s, box-shadow 0.2s;
}
.save-settings-btn:hover { transform: translateY(-1px); box-shadow: 0 4px 12px rgba(124, 81, 240, 0.3); }

/* Responsive */
@media (max-width: 768px) {
    .sidebar { position: absolute; height: 100%; transform: translateX(-100%); }
    .sidebar.open { transform: translateX(0); box-shadow: 4px 0 24px rgba(0,0,0,0.5); }
    .main-content { width: 100%; }
    .menu-btn { display: block; }
    .message-content { max-width: 90%; }
    .input-area { padding: 1rem; }
}