:root {
    --bg-color: #0a0a0a;
    --accent-orange: #ff8c00;
    --accent-red: #e63946;
    --accent-gradient: linear-gradient(135deg, #ff4d00 0%, #ff8c00 50%, #e63946 100%);
    --glass-bg: rgba(20, 20, 20, 0.6);
    --glass-border: rgba(255, 140, 0, 0.15);
    --text-main: #f8f9fa;
    --text-muted: #a0a0a0;
    --font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

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

body {
    background-color: var(--bg-color);
    background-image: 
        radial-gradient(circle at 10% 10%, rgba(230, 57, 70, 0.1) 0%, transparent 30%),
        radial-gradient(circle at 90% 90%, rgba(255, 140, 0, 0.05) 0%, transparent 30%);
    color: var(--text-main);
    font-family: var(--font-family);
    min-height: 100vh;
    overflow-x: hidden;
}

/* --- MODAL SYSTEM (FIXED FOR MOBILE) --- */

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    display: none; /* Hidden by default */
    justify-content: center;
    align-items: center;
    z-index: 1000;
    opacity: 0;
    transition: opacity 0.3s ease;
    padding: 20px; /* Padding pour ne pas coller aux bords du téléphone */
}

.modal-overlay.active {
    display: flex;
    opacity: 1;
}

.modal-content {
    background: var(--glass-bg);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    padding: 30px;
    width: 100%;
    max-width: 450px;
    max-height: 85vh; /* Empêche la modal de sortir de l'écran */
    overflow-y: auto; /* Scroll interne si contenu trop long */
    transform: scale(0.9);
    transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
    box-shadow: 0 20px 50px rgba(0,0,0,0.5);
    position: relative;
}

.modal-overlay.active .modal-content {
    transform: scale(1);
}

.modal-header {
    margin-bottom: 25px;
    text-align: center;
}

.modal-header h2 {
    font-size: 1.6rem;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.modal-body {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

/* Buttons in Modal */
.action-btn {
    padding: 14px 20px;
    border-radius: 12px;
    border: none;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    width: 100%; /* Boutons pleine largeur dans la modal */
}

.btn-upload {
    background: var(--accent-gradient);
    color: white;
}

.btn-upload:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 15px rgba(255, 77, 0, 0.3);
}

.btn-training {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-muted);
    border: 1px solid rgba(255, 255, 255, 0.1);
    cursor: not-allowed;
    position: relative;
    overflow: hidden;
}

.btn-training::after {
    content: "Bientôt disponible";
    position: absolute;
    bottom: 4px;
    font-size: 0.6rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* --- MAIN APP STYLES --- */

.app-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

.main-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
    margin-bottom: 20px;
}

.logo {
    font-size: 2rem;
    font-weight: 900;
    letter-spacing: -1px;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    filter: drop-shadow(0 0 10px rgba(255, 77, 0, 0.3));
}

.nav-slider-container {
    display: flex;
    align-items: center;
    gap: 10px;
    background: var(--glass-bg);
    padding: 6px;
    border-radius: 16px;
    border: 1px solid var(--glass-border);
    position: relative;
    width: 400px;
}

.slider-viewport {
    overflow: hidden;
    width: 100%;
    position: relative;
}

.week-selector {
    display: flex;
    gap: 8px;
    transition: transform 0.4s cubic-bezier(0.25, 1, 0.5, 1);
    will-change: transform;
}

.week-btn {
    flex: 0 0 auto;
    background: transparent;
    border: none;
    color: var(--text-muted);
    padding: 8px 16px;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s ease;
}

.week-btn:hover {
    color: var(--text-main);
    background: rgba(255, 255, 255, 0.05);
}

.week-btn.active {
    background: var(--accent-gradient);
    color: white;
    box-shadow: 0 4px 15px rgba(255, 77, 0, 0.4);
}

.slider-arrow {
    background: transparent;
    border: none;
    color: var(--text-main);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0 10px;
    transition: color 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.slider-arrow:hover {
    color: var(--accent-orange);
}

.glass-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    padding: 30px;
}

.card-header {
    margin-bottom: 30px;
    border-left: 5px solid var(--accent-orange);
    padding-left: 20px;
}

.card-header h2 {
    font-size: 2rem;
    font-weight: 700;
}

.timetable-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 20px;
    min-height: 500px;
}

@media (max-width: 1000px) {
    .timetable-grid { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 700px) {
    .timetable-grid { grid-template-columns: repeat(2, 1fr); }
    .nav-slider-container { width: 250px; }
}

@media (max-width: 500px) {
    .timetable-grid { grid-template-columns: 1fr; }
}

.day-column {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.day-title {
    font-size: 1.1rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 10px;
    text-align: center;
}

.course-card {
    background: rgba(255, 255, 255, 0.03);
    border-left: 4px solid var(--course-color);
    border-radius: 12px;
    padding: 15px;
    position: relative;
    overflow: hidden;
    transition: transform 0.3s ease, background 0.3s ease;
    cursor: pointer;
}

.course-card:hover {
    transform: translateY(-5px);
    background: rgba(255, 255, 255, 0.07);
    box-shadow: 0 10px 20px rgba(0,0,0,0.4);
}

.course-time {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-bottom: 5px;
}

.course-subject {
    font-weight: 700;
    font-size: 1rem;
}

.empty-slot {
    text-align: center;
    padding: 20px;
    color: #333;
    font-style: italic;
    font-size: 0.9rem;
}

.holiday-overlay {
    grid-column: 1 / -1;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 400px;
}

.holiday-content {
    text-align: center;
    animation: fadeIn 1s ease;
}

.holiday-icon {
    font-size: 4rem;
    display: block;
    margin-bottom: 15px;
}

.holiday-content p {
    font-size: 1.5rem;
    color: var(--text-muted);
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}