/* Variables */
:root {
    --gradient-1: linear-gradient(135deg, #FF8787, #FFA5A5);
    --gradient-2: linear-gradient(135deg, #63B3ED, #4FD1C5);
    --gradient-3: linear-gradient(135deg, #68D391, #4FD1C5);
    --gradient-4: linear-gradient(135deg, #F687B3, #F6E05E);
    --pink: #FF8787;
    --blue: #63B3ED;
    --green: #68D391;
    --yellow: #F6E05E;
}

/* Layout de base */
.course-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    position: relative;
    z-index: 1;
}

/* Navigation */
.nav-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.nav-links {
    display: flex;
    gap: 1rem;
}

.nav-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    background: linear-gradient(135deg, rgba(255, 107, 107, 0.1), rgba(255, 142, 142, 0.1));
    border: 2px solid transparent;
    background: 
        linear-gradient(white, white) padding-box,
        var(--gradient-1) border-box;
    color: #0f172a;
    text-decoration: none;
    border-radius: 12px;
    font-weight: 500;
    transition: all 0.3s ease;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.nav-link:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
}

/* Sections */
.section {
    background: rgba(255, 255, 255, 0.9);
    border-radius: 20px;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.section:nth-child(3n+1) {
    border-top: 5px solid var(--pink);
}

.section:nth-child(3n+2) {
    border-top: 5px solid var(--blue);
}

.section:nth-child(3n+3) {
    border-top: 5px solid var(--green);
}

/* Titres */
.section-title {
    font-size: 2rem;
    margin-bottom: 1.5rem;
}

.section:nth-child(3n+1) .section-title {
    background: var(--gradient-1);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.section:nth-child(3n+2) .section-title {
    background: var(--gradient-2);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.section:nth-child(3n+3) .section-title {
    background: var(--gradient-3);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.emoji-title {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.emoji-title .emoji {
    font-size: 2.5rem;
}

/* Boîtes de contenu */
.lesson-box {
    border: 2px solid transparent;
    background: 
        linear-gradient(white, white) padding-box,
        var(--gradient-1) border-box;
    padding: 2rem;
    border-radius: 12px;
    margin: 1.5rem 0;
    transition: all 0.3s ease;
}

.section:nth-child(3n+2) .lesson-box {
    background: 
        linear-gradient(white, white) padding-box,
        var(--gradient-2) border-box;
}

.section:nth-child(3n+3) .lesson-box {
    background: 
        linear-gradient(white, white) padding-box,
        var(--gradient-3) border-box;
}

.lesson-box:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

/* Notes et blocs mathématiques */
.note {
    background: linear-gradient(135deg, rgba(255, 107, 107, 0.05), rgba(255, 142, 142, 0.05));
    border-radius: 12px;
    padding: 1.5rem;
    margin: 1.5rem 0;
}

.math-block {
    background: linear-gradient(135deg, rgba(255, 107, 107, 0.05), rgba(255, 142, 142, 0.05));
    border: 2px solid transparent;
    background: 
        linear-gradient(white, white) padding-box,
        var(--gradient-1) border-box;
    padding: 1.5rem;
    border-radius: 12px;
    margin: 1.5rem 0;
}

/* Fun facts */
.fun-fact {
    background: linear-gradient(135deg, rgba(250, 112, 154, 0.1), rgba(254, 225, 64, 0.1));
    border-radius: 12px;
    padding: 1.5rem;
    margin: 1.5rem 0;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
}

/* Exercices */
.practice-box {
    background: linear-gradient(135deg, rgba(104, 211, 145, 0.1), rgba(79, 209, 197, 0.1));
    border-radius: 16px;
    padding: 2rem;
    margin: 2rem 0;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.practice-box h3 {
    color: #2D3748;
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
}

.practice-box .step {
    background: white;
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.practice-box h4 {
    color: #4A5568;
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

/* Formulaires d'exercices */
.number-select, .practice-box select {
    padding: 0.5rem 1rem;
    border: 2px solid #E2E8F0;
    border-radius: 8px;
    background-color: white;
    color: #2D3748;
    font-size: 1rem;
    margin: 0 0.5rem;
    transition: all 0.3s ease;
}

.number-select:focus, .practice-box select:focus {
    outline: none;
    border-color: #68D391;
    box-shadow: 0 0 0 3px rgba(104, 211, 145, 0.2);
}

.check-button {
    background: var(--gradient-3);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-top: 1rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.check-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 12px -2px rgba(0, 0, 0, 0.15);
}

.check-button:active {
    transform: translateY(0);
}

/* Feedback */
.feedback {
    margin-top: 1rem;
    padding: 1rem;
    border-radius: 8px;
    font-weight: 500;
}

.feedback.success {
    background-color: rgba(104, 211, 145, 0.2);
    color: #2F855A;
}

.feedback.error {
    background-color: rgba(255, 135, 135, 0.2);
    color: #C53030;
}

/* Listes */
.divisions-list {
    list-style: none;
    padding: 0;
    margin: 1rem 0;
}

.divisions-list li {
    background: rgba(104, 211, 145, 0.1);
    padding: 0.75rem 1rem;
    margin-bottom: 0.5rem;
    border-radius: 6px;
    color: #2D3748;
    font-weight: 500;
}

/* Astuces et équations */
.tip {
    color: #718096;
    font-style: italic;
    margin-top: 1rem;
}

.equation {
    background: rgba(104, 211, 145, 0.1);
    padding: 1rem;
    border-radius: 8px;
    margin: 1rem 0;
    display: inline-block;
}

/* Schémas de fractions */
.fraction-diagram {
    width: 200px;
    height: 100px;
    margin: 1rem auto;
    display: block;
}

.fraction-diagram rect, .fraction-diagram circle {
    stroke: #333;
    stroke-width: 2;
}

.fraction-part {
    fill: var(--pink);
    opacity: 0.7;
}

.fraction-empty {
    fill: none;
}

/* Sommaire */
.summary-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.summary-card {
    background: white;
    border-radius: 12px;
    padding: 1.5rem;
    border: 2px solid transparent;
    background: 
        linear-gradient(white, white) padding-box,
        var(--gradient-1) border-box;
    transition: all 0.3s ease;
}

.summary-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.summary-card h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: #2D3748;
}

.summary-card p {
    color: #4A5568;
    margin-bottom: 1rem;
}

.summary-card .nav-link {
    display: inline-flex;
    margin-top: 1rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .course-container {
        padding: 1rem;
    }

    .section {
        padding: 1.5rem;
    }

    .section-title {
        font-size: 1.5rem;
    }

    .practice-box {
        padding: 1.5rem;
    }

    .nav-links {
        flex-direction: column;
    }

    .summary-grid {
        grid-template-columns: 1fr;
    }
}