/* 
   MathBox Pro - Telegram WebApp Styles
   Style Design : "Nano Banana" (Card-based, Clean, Responsive)
*/

:root {
    /* Extraction des variables dynamiques de Telegram (adaptatif Sombre/Clair) */
    --tg-bg-color: var(--tg-theme-bg-color, #f0f2f5);
    --tg-text-color: var(--tg-theme-text-color, #222222);
    --tg-hint-color: var(--tg-theme-hint-color, #8e8e93);
    --tg-link-color: var(--tg-theme-link-color, #007aff);
    --tg-button-color: var(--tg-theme-button-color, #3390ec);
    --tg-button-text: var(--tg-theme-button-text-color, #ffffff);
    --tg-secondary-bg: var(--tg-theme-secondary-bg-color, #ffffff);
    
    /* Variables privées d'interface MathBox */
    --shadow-soft: 0 4px 20px rgba(0, 0, 0, 0.05);
    --shadow-hard: 0 8px 30px rgba(0, 0, 0, 0.12);
    --border-radius-lg: 16px;
    --border-radius-pill: 100px;
    --spacing-md: 16px;
}

/* Reset de bas niveau pour mobiles */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background-color: var(--tg-bg-color);
    color: var(--tg-text-color);
    line-height: 1.6;
    /* Laisser un énorme padding en bas pour que la ScrollBar ne bloque pas le FAB */
    padding-bottom: 120px; 
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Configuration typographique fine pour LaTeX via SVG */
.MathJax {
    font-size: 1.1em !important;
    color: var(--tg-text-color) !important;
}

/* En-tête Fixe (Glassmorphism Effect) */
.navbar {
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 18px 20px;
    background-color: color-mix(in srgb, var(--tg-bg-color) 85%, transparent);
    backdrop-filter: blur(12px) saturate(180%);
    -webkit-backdrop-filter: blur(12px) saturate(180%);
    border-bottom: 1px solid color-mix(in srgb, var(--tg-hint-color) 15%, transparent);
    box-shadow: 0 2px 10px rgba(0,0,0,0.03);
}

.navbar h1 {
    font-size: 18px;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin: 0;
    color: var(--tg-text-color);
    text-align: center;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Layout Principal */
.container {
    padding: var(--spacing-md);
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* Structure Card (Nano Banana Concept) */
.card {
    background-color: var(--tg-secondary-bg);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-soft);
    overflow: hidden;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

/* L'interface réagit au clic au niveau de la carte */
.card:active {
    transform: scale(0.99);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 20px;
    background-color: color-mix(in srgb, var(--tg-secondary-bg) 95%, var(--tg-hint-color) 5%);
    border-bottom: 1px solid color-mix(in srgb, var(--tg-hint-color) 15%, transparent);
}

/* Badge de difficulté */
.badge {
    background-color: color-mix(in srgb, var(--tg-button-color) 15%, transparent);
    color: var(--tg-button-color);
    font-size: 12px;
    font-weight: 700;
    padding: 4px 12px;
    border-radius: var(--border-radius-pill);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.points {
    font-size: 14px;
    font-weight: 700;
    color: var(--tg-hint-color);
}

.card-body {
    padding: 24px 20px;
    font-size: 16px;
    color: var(--tg-text-color);
    /* Gère le défilement x si des mathématiques sont très longues */
    overflow-x: auto; 
}

/* Design Card Spécifique pour Solution */
.solution-card {
    border-left: 5px solid var(--tg-button-color);
    /* Animation d'apparition */
    animation: fadeSlideUp 0.4s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.solution-header {
    justify-content: flex-start;
}

.solution-header h2 {
    font-size: 16px;
    font-weight: 700;
    color: var(--tg-button-color);
    margin: 0;
}

/* Floating Action Button (FAB) */
.fab-container {
    position: fixed;
    bottom: 24px;
    left: 0;
    right: 0;
    display: flex;
    justify-content: center;
    padding: 0 var(--spacing-md);
    pointer-events: none; /* Laisse le scroll actif derrière le conteneur */
    z-index: 100;
}

.main-button {
    pointer-events: auto; /* Active le bouton */
    background-color: var(--tg-button-color);
    color: var(--tg-button-text);
    border: none;
    border-radius: var(--border-radius-pill);
    padding: 16px 32px;
    font-size: 16px;
    font-weight: 600;
    font-family: inherit;
    box-shadow: 0 8px 24px color-mix(in srgb, var(--tg-button-color) 35%, transparent);
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    max-width: 380px; /* Sur tablette, empêche qu'il soit gigantesque */
}

.main-button:active {
    transform: translateY(2px) scale(0.97);
    box-shadow: 0 4px 12px color-mix(in srgb, var(--tg-button-color) 25%, transparent);
}

/* État Actif (Bouton d'annulation de solution) */
.main-button.active {
    background-color: color-mix(in srgb, var(--tg-button-color) 10%, var(--tg-secondary-bg));
    color: var(--tg-button-color);
    border: 2px solid var(--tg-button-color);
    box-shadow: var(--shadow-soft);
}

.main-button .icon {
    font-size: 1.1em;
}

/* Espacement texte pour les paragraphes LaTeX */
.card-body p {
    margin-bottom: 14px;
}
.card-body p:last-child {
    margin-bottom: 0;
}

/* Rendu des environnements enumerate et itemize convertis depuis LaTeX */
.latex-list {
    margin-top: 12px;
    margin-bottom: 16px;
    padding-left: 24px;
    color: var(--tg-text-color);
}
.latex-list li {
    margin-bottom: 8px;
    line-height: 1.6;
}

/* Animations clés */
@keyframes fadeSlideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}