/* Ertqi page styles: course.css */
:root {
            --bg: #0f172a;
            --text: #e2e8f0;
            --primary: #3b82f6;
            --accent: #8b5cf6;
            --card-bg: #1e293b
        }

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

        body {
            font-family: 'Segoe UI', system-ui, sans-serif;
            background-color: var(--bg);
            color: var(--text);
            line-height: 1.6
        }

        nav {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 1.5rem 2rem;
            background: rgba(15, 23, 42, 0.9);
            backdrop-filter: blur(10px);
            position: sticky;
            top: 0;
            z-index: 100
        }

        nav .logo {
            font-size: 1.5rem;
            font-weight: bold;
            color: #fff;
            text-decoration: none
        }

        nav ul {
            display: flex;
            list-style: none;
            gap: 2rem
        }

        nav a {
            color: #94a3b8;
            text-decoration: none;
            transition: color .3s
        }

        nav a:hover {
            color: #fff
        }

        .container {
            max-width: 1000px;
            margin: 0 auto;
            padding: 4rem 2rem
        }

        .hero {
            position: relative;
            border-radius: 2rem;
            overflow: hidden;
            margin-bottom: 4rem
        }

        .hero img {
            width: 100%;
            height: 300px;
            object-fit: cover;
            opacity: 0.6
        }

        .hero-text {
            position: absolute;
            bottom: 0;
            left: 0;
            padding: 3rem;
            background: linear-gradient(transparent, #0f172a)
        }

        .hero h1 {
            font-size: 3rem;
            color: #fff;
            margin-bottom: 0.5rem
        }

        .module {
            background: var(--card-bg);
            padding: 2rem;
            border-radius: 1rem;
            margin-bottom: 2rem;
            border: 1px solid rgba(255, 255, 255, 0.05)
        }

        .module h3 {
            color: #60a5fa;
            margin-bottom: 1rem;
            font-size: 1.5rem
        }

        .module ul {
            margin-left: 1.5rem;
            color: #cbd5e1
        }

        li {
            margin-bottom: 0.5rem
        }

        .btn {
            display: inline-block;
            padding: 0.75rem 1.5rem;
            background: linear-gradient(to right, var(--primary), var(--accent));
            color: #fff;
            border-radius: 0.5rem;
            text-decoration: none;
            margin-top: 2rem
        }

        footer {
            text-align: center;
            padding: 3rem;
            color: #64748b;
            border-top: 1px solid rgba(255, 255, 255, 0.05)
        }