:root {
    --bg-dark: #0a0a0c;
    --bg-sidebar: rgba(17, 17, 20, 0.9);
    --bg-chat: rgba(15, 15, 18, 0.7);
    --bg-input: rgba(26, 26, 30, 0.8);
    --text-main: #e0e0e6;
    --text-dim: #9494a0;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --border: rgba(39, 39, 42, 0.5);
    --danger: #ef4444;
    --success: #22c55e;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

body {
    background-color: var(--bg-dark);
    background-image: linear-gradient(rgba(10, 10, 12, 0.7), rgba(10, 10, 12, 0.8)), url('image.png');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    color: var(--text-main);
    height: 100vh;
    overflow: hidden;
}

.hidden { display: none !important; }

/* Overlay Login */
.overlay {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0, 0, 0, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    backdrop-filter: blur(10px);
}

.login-box {
    background: var(--bg-sidebar);
    padding: 2.5rem;
    border-radius: 12px;
    border: 1px solid var(--border);
    width: 100%;
    max-width: 400px;
    text-align: center;
    box-shadow: var(--shadow);
    backdrop-filter: blur(15px);
}

.login-box h1 {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: var(--accent);
    letter-spacing: 2px;
}

.login-box p {
    color: var(--text-dim);
    margin-bottom: 2rem;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.input-group input {
    background: var(--bg-input);
    border: 1px solid var(--border);
    padding: 1rem;
    border-radius: 8px;
    color: white;
    font-size: 1rem;
    text-align: center;
}

.input-group button {
    background: var(--accent);
    color: white;
    border: none;
    padding: 1rem;
    border-radius: 8px;
    font-weight: bold;
    cursor: pointer;
    transition: 0.3s;
}

.input-group button:hover {
    background: var(--accent-hover);
}

.error-msg {
    color: var(--danger);
    margin-top: 1rem;
    font-size: 0.9rem;
}

/* App Layout */
.app-container {
    display: flex;
    height: 100vh;
}

/* Sidebar */
.sidebar {
    width: 280px;
    background: var(--bg-sidebar);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    padding: 1.5rem;
    backdrop-filter: blur(15px);
}

.sidebar-header h2 {
    color: var(--accent);
    font-size: 1.2rem;
    margin-bottom: 2rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.user-info {
    background: var(--bg-input);
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 2rem;
    border: 1px solid var(--border);
}

.info-item {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.5rem;
    font-size: 0.85rem;
}

.info-item .label { color: var(--text-dim); }
.info-item .value.online { color: var(--success); }

.sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    flex: 1;
}

.nav-item {
    background: transparent;
    border: none;
    color: var(--text-main);
    padding: 0.8rem 1rem;
    border-radius: 8px;
    text-align: left;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 12px;
    transition: 0.2s;
}

.nav-item:hover { background: var(--bg-input); }
.nav-item.active { background: var(--accent); color: white; }
.nav-item.logout { margin-top: auto; color: var(--text-dim); }
.nav-item.logout:hover { color: var(--danger); }

.sidebar-footer {
    padding-top: 1rem;
    font-size: 0.75rem;
    color: var(--text-dim);
    text-align: center;
}

/* Chat Container */
.chat-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: var(--bg-chat);
    position: relative;
    backdrop-filter: blur(5px);
}

.chat-header {
    padding: 1rem 2rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(15, 15, 18, 0.8);
    backdrop-filter: blur(10px);
}

.chat-info h3 { font-size: 1.1rem; }
.chat-info p { font-size: 0.8rem; color: var(--text-dim); }
.badge {
    background: var(--danger);
    font-size: 0.6rem;
    padding: 2px 6px;
    border-radius: 4px;
    vertical-align: middle;
    margin-left: 5px;
}

.chat-actions button {
    background: transparent;
    border: none;
    color: var(--text-dim);
    cursor: pointer;
    font-size: 1.1rem;
    padding: 5px;
}

.chat-actions button:hover { color: var(--danger); }

/* Messages */
.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.message {
    display: flex;
    gap: 1.5rem;
    max-width: 900px;
    margin: 0 auto;
    width: 100%;
}

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

.avatar {
    width: 36px;
    height: 36px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-input);
    border: 1px solid var(--border);
    flex-shrink: 0;
}

.message.assistant .avatar { color: var(--accent); }
.message.user .avatar { color: var(--text-main); }

.content {
    line-height: 1.6;
    font-size: 1rem;
    color: var(--text-main);
    overflow-wrap: break-word;
    width: 100%;
}

.message.user .content {
    background: var(--bg-input);
    padding: 1rem;
    border-radius: 12px;
    max-width: 80%;
    backdrop-filter: blur(10px);
}

/* Markdown Styles */
.content pre {
    background: #1e1e2e;
    padding: 1.5rem 1rem 1rem;
    border-radius: 8px;
    margin: 1rem 0;
    overflow-x: auto;
    border: 1px solid var(--border);
    position: relative;
}

.content code {
    font-family: 'Fira Code', monospace;
    font-size: 0.9rem;
}

.copy-btn {
    position: absolute;
    top: 8px;
    right: 8px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--text-dim);
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 0.7rem;
    cursor: pointer;
    transition: 0.2s;
    z-index: 10;
    text-transform: uppercase;
    font-weight: bold;
}

.copy-btn:hover {
    background: var(--accent);
    color: white;
}

.copy-btn.copied {
    background: var(--success);
    color: white;
}

/* Input Area */
.chat-input-area {
    padding: 1.5rem 2rem 2.5rem;
    max-width: 900px;
    margin: 0 auto;
    width: 100%;
}

.input-wrapper {
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 0.8rem 1rem;
    display: flex;
    align-items: flex-end;
    gap: 10px;
    box-shadow: var(--shadow);
    backdrop-filter: blur(20px);
}

#user-input {
    flex: 1;
    background: transparent;
    border: none;
    color: white;
    resize: none;
    font-size: 1rem;
    max-height: 200px;
    outline: none;
    padding: 5px 0;
}

#btn-send {
    background: var(--accent);
    color: white;
    border: none;
    width: 36px;
    height: 36px;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: 0.2s;
}

#btn-send:hover { background: var(--accent-hover); }

.input-hint {
    font-size: 0.75rem;
    color: var(--text-dim);
    text-align: center;
    margin-top: 0.8rem;
}

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

@media (max-width: 768px) {
    .sidebar { display: none; }
    .message { gap: 1rem; padding: 0 1rem; }
}