@import url("responsive-global.css");
   @import url('https://fonts.googleapis.com/css2?family=Cairo:wght@400;600;700&family=Amiri:wght@400;700&display=swap');

        :root {
            --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            --lesson-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            --exercises-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
            --videos-gradient: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
            --summary-gradient: linear-gradient(135deg, #a8edea 0%, #fed6e3 100%);
            --proofs-gradient: linear-gradient(135deg, #7209b7 0%, #f72585 100%);
            
            --shadow-soft: 0 4px 15px rgba(0, 0, 0, 0.08);
            --shadow-medium: 0 8px 25px rgba(0, 0, 0, 0.12);
            --border-radius: 12px;
            --border-radius-small: 8px;
            --transition: all 0.3s ease;
        }

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

        body {
            font-family: 'Cairo', sans-serif;
            line-height: 1.6;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
            background-attachment: fixed;
            min-height: 100vh;
            color: #2c3e50;
        }

        /* Bande supérieure mince */
        .top-bar {
            background: var(--primary-gradient);
            color: white;
            padding: 12px 20px;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
            display: flex;
            justify-content: space-between;
            align-items: center;
            position: sticky;
            top: 0;
            z-index: 100;
        }

        .top-bar-title {
            font-size: 1.3em;
            font-weight: 700;
            font-family: 'Amiri', serif;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .top-bar-title .icon {
            font-size: 1.2em;
        }

        .home-btn {
            background: rgba(255, 255, 255, 0.2);
            color: white;
            padding: 8px 20px;
            border-radius: var(--border-radius-small);
            text-decoration: none;
            font-weight: 600;
            font-size: 0.95em;
            transition: var(--transition);
            display: flex;
            align-items: center;
            gap: 8px;
            border: 1px solid rgba(255, 255, 255, 0.3);
        }

        .home-btn:hover {
            background: rgba(255, 255, 255, 0.3);
            transform: translateY(-2px);
        }

        /* Container principal */
        .main-container {
            max-width: 1200px;
            margin: 20px auto;
            padding: 0 15px;
        }

        /* Grille de cartes compactes */
        .content-cards {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 20px;
            margin-bottom: 20px;
        }

        .content-card {
            background: white;
            border-radius: var(--border-radius);
            padding: 20px;
            box-shadow: var(--shadow-soft);
            transition: var(--transition);
            border-top: 4px solid transparent;
        }

        .content-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-medium);
        }

        .card-lesson { border-top-color: #667eea; }
        .card-exercises { border-top-color: #4facfe; }
        .card-videos { border-top-color: #fa709a; }
        .card-summary { border-top-color: #a8edea; }
        .card-proofs { border-top-color: #7209b7; }

        .card-header {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 15px;
            padding-bottom: 12px;
            border-bottom: 2px solid #f0f0f0;
        }

        .card-icon {
            font-size: 1.8em;
            transition: var(--transition);
        }

        .content-card:hover .card-icon {
            transform: scale(1.1) rotate(5deg);
        }

        .card-title {
            font-size: 1.2em;
            font-weight: 700;
            color: #2c3e50;
            font-family: 'Amiri', serif;
        }

        .card-content {
            color: #666;
            font-size: 0.95em;
            margin-bottom: 15px;
            line-height: 1.7;
        }

        /* Sections de topics */
        .topic-section {
            margin-bottom: 12px;
        }

        .topic-title {
            background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
            padding: 10px 15px;
            border-radius: var(--border-radius-small);
            cursor: pointer;
            transition: var(--transition);
            font-weight: 600;
            font-size: 1em;
            color: #2c3e50;
            display: flex;
            align-items: center;
            gap: 10px;
            border: 1px solid #e0e0e0;
        }

        .topic-title:hover {
            background: linear-gradient(135deg, #e9ecef 0%, #dee2e6 100%);
            transform: translateX(-3px);
        }

        .topic-title.active {
            background: var(--primary-gradient);
            color: white;
            border-color: transparent;
        }

        .dropdown-icon {
            font-size: 0.7em;
            transition: var(--transition);
            display: inline-block;
        }

        .topic-title.active .dropdown-icon {
            transform: rotate(180deg);
        }

        .dropdown-content {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease;
            background: rgba(248, 249, 250, 0.5);
            border-radius: 0 0 var(--border-radius-small) var(--border-radius-small);
        }

        .dropdown-content.active {
            max-height: 1000px;
            padding: 10px;
            margin-top: 5px;
        }

        .dropdown-item {
            display: block;
            padding: 10px 15px;
            margin: 5px 0;
            background: white;
            border-radius: var(--border-radius-small);
            color: #2c3e50;
            text-decoration: none;
            transition: var(--transition);
            border: 1px solid #e0e0e0;
            font-size: 0.95em;
        }

        .dropdown-item:hover {
            background: var(--primary-gradient);
            color: white;
            transform: translateX(-5px);
            border-color: transparent;
        }

        /* Sous-menus */
        .submenu-header {
            background: linear-gradient(135deg, #fff8e1 0%, #ffe082 100%);
            padding: 10px 15px;
            margin: 5px 0;
            border-radius: var(--border-radius-small);
            cursor: pointer;
            transition: var(--transition);
            font-weight: 600;
            font-size: 0.9em;
            display: flex;
            align-items: center;
            gap: 8px;
            border: 1px solid #ffd54f;
        }

        .submenu-header:hover {
            background: linear-gradient(135deg, #ffe082 0%, #ffd54f 100%);
            transform: translateX(-3px);
        }

        .submenu-content {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease;
            padding-right: 15px;
        }

        .submenu-content.active {
            max-height: 800px;
            padding-top: 8px;
        }

        .submenu-item {
            display: block;
            padding: 8px 15px;
            margin: 4px 0;
            background: rgba(255, 255, 255, 0.7);
            border-radius: 6px;
            color: #2c3e50;
            text-decoration: none;
            transition: var(--transition);
            font-size: 0.9em;
            border: 1px solid rgba(0, 0, 0, 0.05);
        }

        .submenu-item:hover {
            background: white;
            transform: translateX(-5px);
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
        }

        /* Section des preuves */
        .proof-question {
            background: linear-gradient(135deg, #fff3e0 0%, #ffe0b2 100%);
            padding: 10px 15px;
            margin: 8px 0;
            border-radius: var(--border-radius-small);
            cursor: pointer;
            transition: var(--transition);
            font-weight: 600;
            font-size: 0.95em;
            display: flex;
            align-items: center;
            gap: 8px;
            border: 1px solid #ffcc80;
        }

        .proof-question:hover {
            background: linear-gradient(135deg, #ffe0b2 0%, #ffcc80 100%);
            transform: translateX(-3px);
        }

        .proof-answer {
            display: none;
            background: rgba(255, 255, 255, 0.95);
            padding: 15px;
            margin: 8px 0 10px 15px;
            border-radius: var(--border-radius-small);
            border-right: 4px solid #ff6b6b;
            box-shadow: var(--shadow-soft);
        }

        .proof-steps {
            margin-top: 10px;
        }

        .proof-step {
            padding: 8px 12px;
            margin: 6px 0;
            background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
            border-radius: 6px;
            border-right: 3px solid #9b59b6;
            font-size: 0.9em;
        }

        /* Boutons de navigation */
        .navigation-buttons {
            display: flex;
            justify-content: space-between;
            gap: 15px;
            margin-top: 30px;
            padding: 20px 0;
        }

        .nav-btn {
            flex: 1;
            padding: 12px 25px;
            background: var(--primary-gradient);
            color: white;
            text-decoration: none;
            border-radius: var(--border-radius);
            font-size: 1em;
            font-weight: 600;
            text-align: center;
            transition: var(--transition);
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
            box-shadow: var(--shadow-soft);
        }

        .nav-btn:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-medium);
        }

        .btn-next {
            background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
        }

        /* Responsive */
        @media (max-width: 768px) {
            .top-bar {
                flex-direction: column;
                gap: 10px;
                padding: 10px 15px;
            }

            .top-bar-title {
                font-size: 1.1em;
            }

            .content-cards {
                grid-template-columns: 1fr;
                gap: 15px;
            }

            .navigation-buttons {
                flex-direction: column;
            }
        }

        @media (max-width: 480px) {
            .main-container {
                padding: 0 10px;
            }

            .content-card {
                padding: 15px;
            }

            .card-icon {
                font-size: 1.5em;
            }

            .card-title {
                font-size: 1.1em;
         		 }
				 
				 
        }