/* ═══════════════════════════════════════════════════════════
   COURSE HUB — Light Theme (shared across all hub.html)
   Set --hub-color and --hub-color2 in a <style> block.
   ═══════════════════════════════════════════════════════════ */
@import url('https://fonts.googleapis.com/css2?family=Nunito:wght@400;500;600;700;800&display=swap');

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

body {
    font-family: 'Nunito', sans-serif;
    background: var(--hub-bg, linear-gradient(160deg, #f8fafc 0%, #eef2ff 40%, #f5f3ff 70%, #fce7f3 100%));
    min-height: 100vh;
    padding: 20px;
    color: #1e293b;
}

.container { max-width: 1200px; margin: 0 auto; }

.nav {
    background: rgba(255,255,255,0.8);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    padding: 15px 30px;
    border-radius: 15px;
    margin-bottom: 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border: 1px solid rgba(0,0,0,0.06);
    box-shadow: 0 2px 12px rgba(0,0,0,0.04);
}
.nav a {
    color: var(--hub-color, #6366f1);
    text-decoration: none;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.3s;
}
.nav a:hover { opacity: 0.8; }

.header {
    text-align: center;
    padding: 50px 40px;
    background: linear-gradient(135deg, var(--hub-color, #6366f1), var(--hub-color2, #8b5cf6));
    border-radius: 25px;
    margin-bottom: 40px;
    box-shadow: 0 12px 40px rgba(0,0,0,0.1);
    color: #fff;
}
.header h1 { font-size: 2.8em; margin-bottom: 15px; font-weight: 800; }
.header p { font-size: 1.2em; opacity: 0.92; max-width: 700px; margin: 0 auto 20px; }
.header-badge {
    background: rgba(255,255,255,0.2);
    color: white;
    padding: 10px 25px;
    border-radius: 30px;
    font-weight: 700;
    display: inline-block;
    margin-bottom: 20px;
    backdrop-filter: blur(4px);
}

.modules-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 25px;
    margin-bottom: 40px;
}

.module-card {
    background: rgba(255,255,255,0.75);
    backdrop-filter: blur(8px);
    border-radius: 20px;
    padding: 28px;
    border: 1px solid rgba(0,0,0,0.06);
    position: relative;
    box-shadow: 0 2px 12px rgba(0,0,0,0.04);
    transition: transform 0.3s, box-shadow 0.3s;
}
.module-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 32px rgba(0,0,0,0.08);
}
.module-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; width: 100%; height: 4px;
    background: linear-gradient(90deg, var(--mc, var(--hub-color, #6366f1)), var(--mc2, var(--hub-color2, #8b5cf6)));
    border-radius: 20px 20px 0 0;
}

.module-icon { font-size: 2.5em; margin-bottom: 12px; }
.module-card h3 { font-size: 1.3em; margin-bottom: 10px; color: #1e293b; }
.module-card p { color: #64748b; margin-bottom: 16px; line-height: 1.6; font-size: 0.95em; }

.module-status {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.8em;
    font-weight: 600;
    margin-bottom: 12px;
}
.status-ready { background: #22c55e; color: white; }

.module-lessons {
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px solid rgba(0,0,0,0.06);
}

.lesson-link {
    display: block;
    padding: 10px 15px;
    margin: 6px 0;
    background: rgba(99,102,241,0.04);
    border-radius: 10px;
    color: var(--hub-color, #6366f1);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.92em;
    transition: all 0.2s;
    border: 1px solid transparent;
}
.lesson-link:hover {
    background: rgba(99,102,241,0.08);
    transform: translateX(5px);
    border-color: rgba(99,102,241,0.1);
}

footer {
    text-align: center;
    padding: 30px;
    color: #94a3b8;
    font-size: 0.9em;
}
footer a { color: var(--hub-color, #6366f1); text-decoration: none; font-weight: 600; }
footer a:hover { text-decoration: underline; }

@media (max-width: 768px) {
    .header h1 { font-size: 2em; }
    .modules-grid { grid-template-columns: 1fr; }
    body { padding: 12px; }
}