:root {
    --primary: #3b82f6;
    --primary-hover: #2563eb;
    --bg-dark: #0f172a;
    --bg-card: rgba(30, 41, 59, 0.7);
    --glass-bg: rgba(15, 23, 42, 0.6);
    --glass-border: rgba(255, 255, 255, 0.1);
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --accent: #6366f1;
    --success: #22c55e;
    --danger: #ef4444;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', sans-serif;
}

body {
    background: radial-gradient(circle at top right, #1e1b4b, #0f172a);
    color: var(--text-main);
    min-height: 100vh;
    overflow-x: hidden;
}

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

/* Sidebar */
.sidebar {
    width: 280px;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border-right: 1px solid var(--glass-border);
    display: flex;
    flex-direction: column;
    padding: 25px;
}

.sidebar-header {
    padding-bottom: 30px;
    border-bottom: 1px solid var(--glass-border);
    margin-bottom: 30px;
}

.logo {
    font-size: 1.8rem;
    font-weight: 800;
    letter-spacing: 2px;
    background: linear-gradient(to right, #60a5fa, #a855f7);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-label {
    font-size: 0.7rem;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin-bottom: 15px;
}

.device-item {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid transparent;
    border-radius: 12px;
    padding: 12px 15px;
    margin-bottom: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 12px;
}

.device-item:hover {
    background: rgba(255, 255, 255, 0.08);
    transform: translateY(-2px);
    border-color: var(--glass-border);
}

.device-item.active {
    background: linear-gradient(45deg, rgba(59, 130, 246, 0.2), rgba(99, 102, 241, 0.2));
    border-color: var(--primary);
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.2);
}

.device-status {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}

.device-status.online { background: var(--success); box-shadow: 0 0 10px var(--success); }
.device-status.offline { background: var(--text-muted); }

.device-info strong { display: block; font-size: 0.95rem; }
.device-meta { font-size: 0.75rem; color: var(--text-muted); }

.delete-device-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 5px;
    border-radius: 5px;
    opacity: 0;
    transition: all 0.2s;
    margin-left: auto;
}

.device-item:hover .delete-device-btn {
    opacity: 1;
}

.delete-device-btn:hover {
    background: rgba(239, 68, 68, 0.2);
    color: #ef4444;
}

/* Main Content */
.main-content {
    flex: 1;
    overflow-y: auto;
    padding: 30px;
    position: relative;
}

.glass-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 25px;
}

.device-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
}

.device-stats-grid {
    display: flex;
    gap: 20px;
}

.stat-item {
    background: rgba(255, 255, 255, 0.05);
    padding: 10px 15px;
    border-radius: 10px;
    font-size: 0.85rem;
    display: flex;
    align-items: center;
    gap: 8px;
}

/* Section Controls */
.header-actions {
    display: flex;
    gap: 15px;
}

.btn-group {
    background: rgba(0,0,0,0.2);
    padding: 5px;
    border-radius: 12px;
    display: flex;
    gap: 5px;
}

/* Buttons */
.btn-primary, .btn-secondary, .btn-outline {
    border: none;
    padding: 10px 20px;
    border-radius: 10px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
}

.btn-primary { background: var(--primary); color: white; }
.btn-primary:hover { background: var(--primary-hover); transform: translateY(-1px); }

.btn-secondary { background: rgba(255,255,255,0.1); color: white; }
.btn-secondary:hover { background: rgba(255,255,255,0.15); }

.btn-outline { background: transparent; border: 1px solid var(--glass-border); color: var(--text-muted); }
.btn-outline:hover { border-color: var(--text-main); color: var(--text-main); }

/* Chat UI */
.chat-container {
    display: flex;
    height: 600px;
    border-radius: 20px;
    overflow: hidden;
}

.chat-sidebar {
    width: 300px;
    border-right: 1px solid var(--glass-border);
    display: flex;
    flex-direction: column;
}

.conversation-list {
    flex: 1;
    overflow-y: auto;
}

.conversation-item {
    padding: 15px 20px;
    cursor: pointer;
    border-bottom: 1px solid rgba(255,255,255,0.03);
    transition: all 0.2s;
}

.conversation-item:hover { background: rgba(255,255,255,0.05); }
.conversation-item.active { background: rgba(59, 130, 246, 0.1); border-left: 3px solid var(--primary); }

.chat-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: rgba(0,0,0,0.1);
}

.chat-messages {
    flex: 1;
    padding: 25px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.message {
    max-width: 75%;
    display: flex;
}

.message.received { align-self: flex-start; }
.message.sent { align-self: flex-end; }

.message-bubble {
    padding: 12px 18px;
    border-radius: 15px;
    font-size: 0.95rem;
    line-height: 1.5;
}

.received .message-bubble { background: rgba(255,255,255,0.1); color: var(--text-main); border-bottom-left-radius: 2px; }
.sent .message-bubble { background: var(--primary); color: white; border-bottom-right-radius: 2px; }

.chat-input {
    padding: 20px;
    background: var(--glass-bg);
    border-top: 1px solid var(--glass-border);
}

.form-control {
    background: rgba(0,0,0,0.2);
    border: 1px solid var(--glass-border);
    color: white;
    padding: 12px 15px;
    border-radius: 10px;
    width: 100%;
    outline: none;
    transition: border-color 0.2s;
}

.form-control:focus { border-color: var(--primary); }

/* Table Styling */
.modern-table {
    width: 100%;
    border-collapse: collapse;
}

.modern-table th {
    text-align: left;
    padding: 15px;
    color: var(--text-muted);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    border-bottom: 1px solid var(--glass-border);
}

.modern-table td {
    padding: 15px;
    border-bottom: 1px solid rgba(255,255,255,0.03);
    font-size: 0.9rem;
}

/* Modals */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.8);
    backdrop-filter: blur(5px);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.modal-content {
    width: 100%;
    max-width: 500px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.modal-actions {
    display: flex;
    gap: 10px;
    margin-top: 30px;
}

/* Empty States */
.empty-state {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    height: 100%;
    color: var(--text-muted);
    text-align: center;
}

.main-icon {
    font-size: 5rem;
    margin-bottom: 20px;
    opacity: 0.2;
}

::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.1); border-radius: 10px; }
::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.2); }