:root {
    --bg-dark: #0d0f12;
    --bg-card: #14171c;
    --bg-sidebar: #181b20;
    --accent-blue: #3273dc;
    --accent-teal: #00d1b2;
    --text-main: #d8e2ec;
    --text-muted: #7b8a99;
    --border-color: #20262e;
    --status-ok: #23d160;
    --status-fail: #ff3860;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: var(--bg-dark);
    color: var(--text-main);
    display: flex;
    height: 100vh;
    overflow: hidden;
}

/* Sidebar styling */
.sidebar {
    width: 260px;
    background-color: var(--bg-sidebar);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    padding: 20px;
}

.sidebar .brand {
    font-size: 1.4rem;
    font-weight: bold;
    color: var(--accent-teal);
    margin-bottom: 30px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.sidebar nav {
    display: flex;
    flex-direction: column;
    gap: 10px;
    flex-grow: 1;
}

.sidebar nav button {
    background: none;
    border: none;
    color: var(--text-muted);
    text-align: left;
    padding: 12px 15px;
    font-size: 1rem;
    cursor: pointer;
    border-radius: 6px;
    transition: all 0.2s ease;
}

.sidebar nav button:hover, .sidebar nav button.active {
    background-color: var(--bg-card);
    color: var(--accent-blue);
    padding-left: 20px;
}

.logout-btn {
    background: #ff386022 !important;
    color: var(--status-fail) !important;
}

/* Main Area */
.main-content {
    flex-grow: 1;
    padding: 25px;
    overflow-y: auto;
}

.page-section {
    display: none;
}

.page-section.active {
    display: block;
    animation: fadeIn 0.3s ease-in-out;
}

/* Grid Layouts */
.grid-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    margin-bottom: 25px;
}

.card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 20px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.3);
}

.card h3 {
    font-size: 0.9rem;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: 15px;
    letter-spacing: 0.5px;
}

.metric-value {
    font-size: 1.8rem;
    font-weight: 600;
    color: var(--accent-teal);
}

/* Service controls Table */
table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 15px;
}

th, td {
    padding: 12px 15px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

th {
    color: var(--text-muted);
}

.btn-ctrl {
    padding: 6px 12px;
    margin-right: 5px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-weight: bold;
}

.btn-start { background-color: var(--status-ok); color: black; }
.btn-stop { background-color: var(--status-fail); color: white; }

/* Log system */
.log-box {
    background-color: #05070a;
    font-family: monospace;
    padding: 15px;
    height: 400px;
    overflow-y: auto;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    color: #4af626;
}

.input-field {
    background-color: var(--bg-dark);
    border: 1px solid var(--border-color);
    color: white;
    padding: 10px;
    border-radius: 5px;
    margin-bottom: 15px;
    width: 100%;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(5px); }
    to { opacity: 1; transform: translateY(0); }
}