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

body {
    font-family: 'Segoe UI', system-ui, sans-serif;
    background-color: #0d1117;
    color: #e6edf3;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 3rem 1.5rem;
}

header {
    text-align: center;
    margin-bottom: 3rem;
}

.node-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    background: #1c3a2a;
    border: 1px solid #2ea043;
    color: #56d364;
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    padding: 0.35rem 0.9rem;
    border-radius: 999px;
    margin-bottom: 1.2rem;
}

.node-badge::before {
    content: '';
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: #56d364;
    display: inline-block;
}

h1 {
    font-size: 2.4rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    background: linear-gradient(135deg, #68a063 0%, #3c873a 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    color: #8b949e;
    font-size: 1.05rem;
    max-width: 540px;
    line-height: 1.6;
}

.instructor {
    margin-top: 0.6rem;
    color: #6e7681;
    font-size: 0.875rem;
}

.instructor strong {
    color: #8b949e;
}

main {
    width: 100%;
    max-width: 760px;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.section-label {
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: #6e7681;
    margin-bottom: 0.75rem;
}

/* Curriculum cards */
.curriculum-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 1rem;
}

.curriculum-card {
    background: #161b22;
    border: 1px solid #30363d;
    border-radius: 10px;
    padding: 1.2rem 1.3rem;
    transition: border-color 0.2s, transform 0.2s;
}

.curriculum-card:hover {
    border-color: #3c873a;
    transform: translateY(-2px);
}

.curriculum-card .number {
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    color: #3c873a;
    text-transform: uppercase;
    margin-bottom: 0.45rem;
}

.curriculum-card h3 {
    font-size: 0.95rem;
    font-weight: 600;
    color: #e6edf3;
    margin-bottom: 0.4rem;
}

.curriculum-card p {
    font-size: 0.8rem;
    color: #8b949e;
    line-height: 1.5;
}

/* Key facts */
.facts-panel {
    background: #161b22;
    border: 1px solid #30363d;
    border-radius: 10px;
    padding: 1.4rem 1.6rem;
}

.facts-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.7rem;
}

.facts-list li {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    font-size: 0.9rem;
    color: #c9d1d9;
    line-height: 1.5;
}

.facts-list li::before {
    content: '→';
    color: #3c873a;
    font-weight: 700;
    flex-shrink: 0;
    margin-top: 0.05rem;
}

/* Projects section */
.projects-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    list-style: none;
}

.projects-list li a {
    display: flex;
    align-items: center;
    gap: 0.9rem;
    background: #161b22;
    border: 1px solid #30363d;
    border-radius: 10px;
    padding: 1rem 1.3rem;
    color: #e6edf3;
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: border-color 0.2s, background 0.2s;
}

.projects-list li a:hover {
    border-color: #3c873a;
    background: #1c2a1e;
}

.projects-list li a .icon {
    font-size: 1.3rem;
    flex-shrink: 0;
}

.projects-list li a .meta {
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
}

.projects-list li a .meta small {
    font-size: 0.75rem;
    color: #6e7681;
    font-weight: 400;
}

.coming-soon {
    opacity: 0.45;
    cursor: default;
    pointer-events: none;
}

.coming-soon::after {
    content: 'Coming Soon';
    margin-left: auto;
    font-size: 0.7rem;
    color: #6e7681;
    font-weight: 400;
    letter-spacing: 0.04em;
}

footer {
    margin-top: 3rem;
    color: #484f58;
    font-size: 0.8rem;
    text-align: center;
}

footer a {
    color: #3c873a;
    text-decoration: none;
}