@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@300;400;500;600&display=swap');

:root {
    --bg: #05070B;
    --surface: #0B0E14;
    --surface-hover: #11151E;
    --border: #161B26;
    --border-focus: #222C3E;
    --text-main: #E2E8F0;
    --text-muted: #64748B;
    --accent: #00A3FF;
}

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

body {
    background-color: var(--bg);
    color: var(--text-main);
    font-family: 'JetBrains Mono', monospace;
    font-size: 13px;
    padding: 60px 40px;
    letter-spacing: -0.2px;
}

.grid-container {
    display: grid;
    grid-template-columns: 240px 1fr;
    gap: 60px;
    max-width: 1200px;
    margin: 0 auto;
}

/* Sidebar Navigation */
.panel-sidebar h2 {
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--text-muted);
    margin-bottom: 40px;
}

.panel-sidebar ul {
    list-style: none;
}

.panel-sidebar ul li {
    margin-bottom: 4px;
}

.panel-sidebar ul li a {
    color: var(--text-muted);
    text-decoration: none;
    display: block;
    padding: 10px 12px;
    font-weight: 400;
    transition: color 0.15s, background-color 0.15s;
}

.panel-sidebar ul li a:hover, 
.panel-sidebar ul li a.active {
    color: var(--text-main);
    background-color: var(--surface);
}

/* Main Content Area */
.panel-main h1 {
    font-size: 24px;
    font-weight: 500;
    color: #FFF;
    margin-bottom: 6px;
    letter-spacing: -0.5px;
}

.subtitle {
    color: var(--text-muted);
    font-size: 12px;
    margin-bottom: 50px;
}

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

.lesson-card {
    background-color: var(--surface);
    border: 1px solid var(--border);
    padding: 30px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: border-color 0.2s, background-color 0.2s;
}

.lesson-card:hover {
    border-color: var(--border-focus);
    background-color: var(--surface-hover);
}

.lesson-card h3 {
    font-size: 14px;
    font-weight: 500;
    color: #FFF;
    margin-bottom: 12px;
}

.lesson-card p {
    color: var(--text-muted);
    font-size: 12px;
    line-height: 1.6;
    margin-bottom: 30px;
}

/* Controls & Inputs */
.input-group {
    margin-bottom: 30px;
}

.input-group label {
    font-size: 11px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
    display: block;
    margin-bottom: 10px;
}

input[type="text"] {
    width: 100%;
    background-color: var(--surface);
    border: 1px solid var(--border);
    color: #FFF;
    padding: 14px;
    font-family: inherit;
    font-size: 13px;
    transition: border-color 0.2s;
}

input[type="text"]:focus {
    outline: none;
    border-color: var(--accent);
}

.btn-launch {
    display: inline-block;
    background-color: transparent;
    color: var(--text-main);
    border: 1px solid var(--border);
    padding: 12px 24px;
    font-family: inherit;
    font-size: 12px;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: border-color 0.15s, color 0.15s;
    width: fit-content;
}

.btn-launch:hover {
    border-color: var(--accent);
    color: var(--accent);
}

/* Interactive Info Boxes */
.info-box {
    margin-top: 50px;
    border-top: 1px solid var(--border);
    padding-top: 30px;
}

.info-box h2 {
    font-size: 15px;
    font-weight: 500;
    color: #FFF;
    margin-bottom: 12px;
}

/* Data Display Tables */
.data-table {
    display: flex;
    flex-direction: column;
}

.table-row {
    display: grid;
    grid-template-columns: 200px 1fr;
    padding: 14px 0;
    border-bottom: 1px solid var(--border);
}

.table-label {
    color: var(--text-muted);
}

.table-value {
    color: var(--text-main);
}