:root {
    --primary-color: #2563eb;
    --secondary-color: #64748b;
    --dark-color: #1e293b;
    --light-bg: #f8fafc;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    line-height: 1.6;
    background-color: #f4f4f9;
}

header {
    background: #333;
    color: #fff;
    padding: 1rem 0;
    width: 100%;
}

nav ul {
    display: flex;
    justify-content: center;
    list-style: none;
}

nav ul li a {
    color: white;
    text-decoration: none;
    padding: 0 15px;
}

.grid-nav {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    padding: 20px;
}

.card {
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    text-align: center;
}

.btn {
    display: inline-block;
    background: #007bff;
    color: white;
    padding: 10px 15px;
    border-radius: 5px;
    text-decoration: none;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 20px;
}

.intro {
    padding: 80px 0;
    background: linear-gradient(135deg, #ebedee 0%, #fdfbfb 100%);
    text-align: center;
}

.intro h1 {
    font-size: 2.5rem;
    color: var(--dark-color);
    margin-bottom: 10px;
}

.subtitle {
    font-size: 1.2rem;
    color: var(--primary-color);
    font-weight: bold;
}

.actions { margin-top: 30px; }
.btn-primary, .btn-secondary {
    padding: 12px 25px;
    border-radius: 5px;
    text-decoration: none;
    display: inline-block;
    margin: 5px;
}
.btn-primary { background: var(--primary-color); color: white; }
/*.btn-secondary { border: 1px solid var(--secondary-color); color: var(--secondary-color); }*/

.grid-links {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    text-align: center;
    margin-top: 20px;
}

.link-card {
    background: white;
    padding: 20px;
    border-radius: 8px;
    text-decoration: none;
    color: inherit;
    border: 1px solid #e2e8f0;
    transition: transform 0.2s;
}

.link-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
}

.error-page {
    padding: 100px 0;
    text-align: center;
    background-color: var(--light-bg);
}

.error-code {
    font-size: 6rem;
    font-weight: 800;
    color: var(--primary-color);
    display: block;
    line-height: 1;
    margin-bottom: 20px;
    opacity: 0.2;
}

.error-content h1 {
    font-size: 2rem;
    color: var(--dark-color);
    margin-bottom: 15px;
}

.error-actions {
    margin: 40px 0;
}

.error-search {
    max-width: 400px;
    margin: 0 auto;
    padding: 20px;
    background: #fff;
    border-radius: 8px;
    border: 1px dashed var(--secondary-color);
    text-align: left;
}

.error-tree {
    list-style: none;
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.9rem;
    color: var(--secondary-color);
    margin-top: 10px;
}

.error-tree ul {
    padding-left: 20px;
    border-left: 1px solid #ccc;
    margin-left: 10px;
}

/* ---------------Hub Travaux--------------- */
.hub-header {
    background-color: var(--dark-color);
    color: white;
    padding: 60px 0;
    text-align: center;
}

.modules-grid {
    padding: 40px 0;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.module-card {
    background: white;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
    position: relative;
    border: 1px solid #eee;
    transition: transform 0.3s ease;
}

.module-card:hover {
    transform: translateY(-5px);
}

.module-badge {
    position: absolute;
    top: 15px;
    right: 15px;
    background: #e2e8f0;
    font-size: 0.7rem;
    padding: 4px 10px;
    border-radius: 20px;
    text-transform: uppercase;
}

.module-card h2 {
    color: var(--primary-color);
    margin-top: 0;
}

.sequence-list {
    list-style: none;
    padding: 0;
    margin: 20px 0;
    border-top: 1px solid #f0f0f0;
}

.sequence-list li {
    padding: 10px 0;
    border-bottom: 1px solid #f9f9f9;
}

.sequence-list a {
    text-decoration: none;
    color: var(--secondary-color);
    font-size: 0.9rem;
}

.sequence-list a:hover {
    color: var(--primary-color);
    padding-left: 5px;
    transition: 0.2s;
}

.btn-view {
    display: block;
    text-align: center;
    background: var(--light-bg);
    color: var(--dark-color);
    padding: 10px;
    border-radius: 6px;
    text-decoration: none;
    font-weight: bold;
}