:root {
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --bg-dark: #0f172a;
    --sidebar-bg: rgba(30, 41, 59, 0.7);
    --chat-bg: #0f172a;
    --message-user: #6366f1;
    --message-ai: rgba(30, 41, 59, 0.8);
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --border: rgba(255, 255, 255, 0.1);
    --glass-bg: rgba(255, 255, 255, 0.03);
    --glass-border: rgba(255, 255, 255, 0.08);
    --radius: 12px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-dark);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: opacity 0.5s ease;
}

.loader {
    width: 48px;
    height: 48px;
    border: 5px solid #FFF;
    border-bottom-color: var(--primary);
    border-radius: 50%;
    display: inline-block;
    box-sizing: border-box;
    animation: rotation 1s linear infinite;
    margin-bottom: 20px;
}

@keyframes rotation {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-main);
    height: 100vh;
    overflow: hidden;
}

h1, h2, .model-badge {
    font-family: 'Outfit', sans-serif;
}

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

/* Sidebar Styling */
.sidebar {
    width: 280px;
    background-color: var(--sidebar-bg);
    backdrop-filter: blur(20px);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    transition: var(--transition);
}

.sidebar-header {
    padding: 24px;
}

.sidebar-header h1 {
    font-size: 1.5rem;
    margin-bottom: 20px;
    background: linear-gradient(135deg, #818cf8 0%, #c084fc 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.btn-primary {
    width: 100%;
    padding: 12px;
    background-color: var(--glass-bg);
    border: 1px solid var(--glass-border);
    color: white;
    border-radius: var(--radius);
    cursor: pointer;
    font-weight: 500;
    transition: var(--transition);
}

.btn-primary:hover {
    background-color: var(--glass-border);
    transform: translateY(-2px);
}

.btn-secondary {
    width: 100%;
    padding: 12px;
    background: linear-gradient(135deg, #22c55e, #16a34a);
    border: none;
    color: white;
    border-radius: var(--radius);
    cursor: pointer;
    font-weight: 500;
    transition: var(--transition);
}

.btn-secondary:hover {
    opacity: 0.9;
    transform: translateY(-2px);
}

.history-container {
    flex: 1;
    overflow-y: auto;
    padding: 12px;
}

.history-item {
    padding: 12px;
    border-radius: 8px;
    cursor: pointer;
    margin-bottom: 4px;
    font-size: 0.9rem;
    color: var(--text-muted);
    transition: var(--transition);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.history-item:hover {
    background-color: var(--glass-bg);
    color: var(--text-main);
}

.sidebar-footer {
    padding: 20px;
    border-top: 1px solid var(--border);
}

.user-profile {
    display: flex;
    align-items: center;
    gap: 12px;
}

.avatar {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, #6366f1, #a855f7);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    font-weight: bold;
    overflow: hidden;
}

.avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* Main Chat Area */
.chat-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    background-color: var(--chat-bg);
    position: relative;
}

.chat-header {
    height: 64px;
    display: flex;
    align-items: center;
    padding: 0 24px;
    border-bottom: 1px solid var(--border);
    background-color: rgba(15, 23, 42, 0.5);
    backdrop-filter: blur(10px);
}

.model-badge {
    background-color: var(--glass-bg);
    border: 1px solid var(--glass-border);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    color: #818cf8;
}

.status-indicator {
    display: inline-block;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    margin-left: 8px;
}

.status-indicator.online {
    background-color: #22c55e;
    box-shadow: 0 0 8px #22c55e;
}

/* Messages */
.messages-container {
    flex: 1;
    overflow-y: auto;
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.welcome-screen {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.welcome-logo {
    font-size: 4rem;
    margin-bottom: 16px;
}

.welcome-screen h2 {
    font-size: 2rem;
    margin-bottom: 8px;
}

.welcome-screen p {
    color: var(--text-muted);
    margin-bottom: 32px;
}

.suggestions {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 12px;
    max-width: 600px;
}

.suggestion-chip {
    background-color: var(--glass-bg);
    border: 1px solid var(--glass-border);
    color: var(--text-main);
    padding: 8px 16px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: var(--transition);
}

.suggestion-chip:hover {
    background-color: var(--glass-border);
    border-color: var(--primary);
}

.message {
    max-width: 80%;
    padding: 16px;
    border-radius: 16px;
    font-size: 1rem;
    line-height: 1.6;
    animation: fadeIn 0.3s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.message.user {
    align-self: flex-end;
    background: linear-gradient(135deg, #6366f1, #4f46e5);
    color: white;
    border-bottom-right-radius: 4px;
}

.message.assistant {
    align-self: flex-start;
    background-color: var(--message-ai);
    border: 1px solid var(--border);
    color: var(--text-main);
    border-bottom-left-radius: 4px;
}

/* Input Area */
.input-area {
    padding: 24px;
    background: linear-gradient(to top, var(--bg-dark) 80%, transparent);
}

.input-container {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
    background-color: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    display: flex;
    align-items: flex-end;
    padding: 8px 12px;
    transition: var(--transition);
}

.input-container:focus-within {
    border-color: var(--primary);
    box-shadow: 0 0 20px rgba(99, 102, 241, 0.2);
}

textarea {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-main);
    resize: none;
    padding: 12px;
    font-family: inherit;
    font-size: 1rem;
    max-height: 200px;
    outline: none;
}

.send-button {
    background-color: var(--primary);
    color: white;
    border: none;
    width: 40px;
    height: 40px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    margin-bottom: 4px;
}

.send-button:disabled {
    background-color: var(--border);
    cursor: not-allowed;
    opacity: 0.5;
}

.send-button svg {
    width: 20px;
    height: 20px;
}

.send-button:not(:disabled):hover {
    background-color: var(--primary-hover);
    transform: scale(1.05);
}

.disclaimer {
    text-align: center;
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 12px;
}

/* Typing Indicator */
.typing {
    display: flex;
    gap: 4px;
    padding: 12px 16px;
}

.dot {
    width: 6px;
    height: 6px;
    background-color: var(--text-muted);
    border-radius: 50%;
    animation: bounce 1.4s infinite ease-in-out both;
}

.dot:nth-child(1) { animation-delay: -0.32s; }
.dot:nth-child(2) { animation-delay: -0.16s; }

@keyframes bounce {
    0%, 80%, 100% { transform: scale(0); }
    40% { transform: scale(1.0); }
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 6px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: var(--glass-border);
    border-radius: 10px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--border);
}

/* Mobile Responsiveness */
.mobile-only {
    display: none;
}

@media (max-width: 768px) {
    .sidebar {
        position: absolute;
        z-index: 100;
        left: -280px;
        height: 100%;
    }
    .sidebar.open {
        left: 0;
    }
    .mobile-only {
        display: block;
        background: transparent;
        border: none;
        color: var(--text-main);
        font-size: 1.5rem;
        cursor: pointer;
        margin-right: 16px;
    }
}