/* Custom Variable Colors */
:root {
    --bg-main: #0f172a;
    --bg-surface: #1e293b;
    --border-color: #334155;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --blue: #38bdf8;
    --amber: #f59e0b;
    --green: #10b981;
}

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

body {
    background-color: var(--bg-main);
    color: var(--text-primary);
    display: flex;
    min-height: 100vh;
}

/* Flexbox Split Sidebar */
.sidebar {
    width: 260px;
    background-color: var(--bg-surface);
    border-right: 1px solid var(--border-color);
    padding: 20px;
}

.logo h2 {
    color: var(--blue);
    font-size: 22px;
    margin-bottom: 30px;
}

.nav-links {
    list-style: none;
}

.nav-links li {
    margin-bottom: 10px;
}

.nav-links a {
    display: block;
    color: var(--text-secondary);
    text-decoration: none;
    padding: 12px 15px;
    border-radius: 6px;
    font-weight: 500;
}

.nav-links a:hover, .nav-links a.active {
    background-color: var(--border-color);
    color: var(--text-primary);
}

/* Main Window Content Box */
.main-content {
    flex-grow: 1;
    padding: 40px;
}

.header {
    margin-bottom: 30px;
}

.header h1 {
    font-size: 28px;
    margin-bottom: 8px;
}

.header p {
    color: var(--text-secondary);
}

/* Simple Flex Layout for Analytics Metrics */
.metrics-container {
    display: flex;
    gap: 20px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.card {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    padding: 20px;
    border-radius: 10px;
    flex: 1;
    min-width: 200px;
}

.card h3 {
    font-size: 14px;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.card .number {
    font-size: 36px;
    font-weight: 700;
    margin: 10px 0 5px 0;
}

.card p {
    font-size: 14px;
    color: var(--text-secondary);
}

/* Accent Borders */
.card-blue { border-left: 4px solid var(--blue); }
.card-blue .number { color: var(--blue); }

.card-amber { border-left: 4px solid var(--amber); }
.card-amber .number { color: var(--amber); }

.card-green { border-left: 4px solid var(--green); }
.card-green .number { color: var(--green); }

/* Information Core Panel */
.info-section {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    padding: 30px;
    border-radius: 10px;
}

.info-section h2 {
    margin-bottom: 15px;
    font-size: 20px;
}

.info-section p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 20px;
}

.spec-list {
    list-style: none;
    margin-bottom: 30px;
}

.spec-list li {
    padding: 10px 0;
    border-bottom: 1px solid var(--border-color);
}

.spec-list li strong {
    color: var(--blue);
}

/* Button Component */
.btn {
    display: inline-block;
    background-color: var(--blue);
    color: var(--bg-main);
    text-decoration: none;
    padding: 12px 24px;
    border-radius: 6px;
    font-weight: 600;
}

.btn:hover {
    opacity: 0.9;
}