:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --secondary: #0ea5e9;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --dark: #1e1b4b;
    --darker: #0f0d24;
    --light: #f8fafc;
    --gray: #64748b;
    --card-bg: rgba(255, 255, 255, 0.05);
    --border: rgba(255, 255, 255, 0.1);
    --sidebar-width: 260px;
}

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

body {
    font-family: 'Inter', sans-serif;
    background: var(--darker);
    color: var(--light);
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    position: fixed;
    left: 0; top: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background: var(--dark);
    border-right: 1px solid var(--border);
    padding: 1.5rem;
    z-index: 100;
}

.sidebar-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--light);
    text-decoration: none;
    margin-bottom: 2rem;
}

.sidebar-logo i {
    width: 36px; height: 36px;
    background: linear-gradient(135deg, #6366f1, #0ea5e9);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 14px;
    color: var(--gray);
    text-decoration: none;
    border-radius: 10px;
    transition: all 0.2s;
    font-weight: 500;
    margin-bottom: 4px;
}

.nav-item:hover { background: var(--card-bg); color: var(--light); }
.nav-item.active {
    background: linear-gradient(135deg, rgba(99,102,241,0.2), rgba(14,165,233,0.1));
    color: var(--primary);
    border: 1px solid rgba(99,102,241,0.3);
}

/* Main Content */
.main-content {
    margin-left: var(--sidebar-width);
    padding: 2rem;
    min-height: 100vh;
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.header h1 { font-size: 1.75rem; font-weight: 700; }
.header-actions { display: flex; gap: 0.75rem; }

.back-link {
    color: var(--gray);
    text-decoration: none;
    font-size: 0.875rem;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-bottom: 0.5rem;
}

.back-link:hover { color: var(--light); }

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 18px;
    border-radius: 10px;
    font-weight: 500;
    font-size: 0.875rem;
    text-decoration: none;
    cursor: pointer;
    border: none;
    transition: all 0.2s;
}

.btn-primary { background: linear-gradient(135deg, #6366f1, #4f46e5); color: white; }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 10px 30px rgba(99,102,241,0.3); }
.btn-secondary { background: var(--card-bg); color: var(--light); border: 1px solid var(--border); }
.btn-warning { background: var(--warning); color: var(--darker); }

/* Filters */
.filters {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.search-box {
    flex: 1;
    min-width: 200px;
    position: relative;
}

.search-box input {
    width: 100%;
    padding: 12px 16px 12px 44px;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    color: var(--light);
}

.search-box input:focus { outline: none; border-color: var(--primary); }
.search-box i { position: absolute; left: 16px; top: 50%; transform: translateY(-50%); color: var(--gray); }

.filter-select {
    padding: 12px 16px;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    color: var(--light);
    cursor: pointer;
}

/* Device Grid */
.device-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

.device-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 1.5rem;
    cursor: pointer;
    transition: all 0.3s;
}

.device-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary);
    box-shadow: 0 20px 40px rgba(99,102,241,0.15);
}

.device-card h3 { font-size: 1rem; margin-bottom: 0.5rem; }
.device-card .serial { font-family: monospace; color: var(--gray); font-size: 0.8rem; margin-bottom: 0.25rem; }
.device-card .ip { color: var(--gray); font-size: 0.8rem; }

.device-header { display: flex; justify-content: flex-end; margin-bottom: 0.75rem; }

.status-badge {
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 0.7rem;
    font-weight: 600;
}

.status-badge.online { background: rgba(16,185,129,0.15); color: #10b981; }
.status-badge.offline { background: rgba(239,68,68,0.15); color: #ef4444; }

.status-online { color: var(--success); }
.status-offline { color: var(--danger); }

/* Empty State */
.empty-state {
    text-align: center;
    padding: 4rem;
    color: var(--gray);
    grid-column: 1 / -1;
}

.empty-state i { font-size: 3rem; margin-bottom: 1rem; display: block; }

/* Modal */
.modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.7);
    backdrop-filter: blur(10px);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal-overlay.active { display: flex; }

.modal {
    background: var(--dark);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 2rem;
    width: 100%;
    max-width: 450px;
}

.modal h2 { margin-bottom: 1.5rem; }

.form-group { margin-bottom: 1rem; }
.form-group label { display: block; margin-bottom: 0.5rem; font-size: 0.875rem; font-weight: 500; }
.form-group input, .form-group select {
    width: 100%;
    padding: 12px 16px;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 10px;
    color: var(--light);
}

.form-group input:focus { outline: none; border-color: var(--primary); }

.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }

.modal-actions { display: flex; gap: 1rem; justify-content: flex-end; margin-top: 1.5rem; }

/* Tabs */
.tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    border-bottom: 1px solid var(--border);
    padding-bottom: 0.5rem;
}

.tab {
    padding: 10px 20px;
    background: transparent;
    border: none;
    color: var(--gray);
    cursor: pointer;
    font-weight: 500;
    border-radius: 8px 8px 0 0;
    transition: all 0.2s;
}

.tab:hover { color: var(--light); }
.tab.active { color: var(--primary); background: var(--card-bg); }

.tab-content { display: none; }
.tab-content.active { display: block; }

/* Cards */
.card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.card h3 { margin-bottom: 1rem; font-size: 1rem; }

.card-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 1.5rem; }

.info-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 1.5rem;
}

.info-card h3 { margin-bottom: 1rem; font-size: 0.9rem; color: var(--gray); }

.info-row {
    display: flex;
    justify-content: space-between;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border);
    font-size: 0.875rem;
}

.info-row:last-child { border-bottom: none; }
.info-row span:first-child { color: var(--gray); }

/* Parameters */
.params-list { max-height: 400px; overflow-y: auto; }

.param-row {
    display: flex;
    justify-content: space-between;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border);
    font-size: 0.8rem;
}

.param-row code { color: var(--secondary); font-size: 0.75rem; }

.wan-item {
    padding: 1rem;
    background: rgba(255,255,255,0.02);
    border-radius: 8px;
    margin-bottom: 0.5rem;
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar { display: none; }
    .main-content { margin-left: 0; }
    .device-grid { grid-template-columns: 1fr; }
    .form-row { grid-template-columns: 1fr; }
}