@import url('https://fonts.googleapis.com/css2?family=Exo+2:wght@400;600;800&family=Poppins:wght@400;600&display=swap');

/* =========================================
   VARIABLES : MODE SOMBRE (CYBERPUNK NÉON)
========================================= */
:root {
    --font-main: 'Poppins', sans-serif;
    --font-heading: 'Exo 2', sans-serif;

    --bg-color: #030307;
    --text-color: #f8fafc;
    --container-bg: rgba(20, 22, 30, 0.45);
    
    --border-color: rgba(0, 240, 255, 0.25);
    --active-border-color: #00f0ff;
    --active-bg-color: rgba(0, 240, 255, 0.15);
    
    --button-bg: rgba(255, 255, 255, 0.05);
    --button-hover-bg: rgba(112, 0, 255, 0.4);

    --shadow-neon: 0 0 20px rgba(0, 240, 255, 0.2);
    --glass-blur: blur(15px);
    
    --bg-gradient-1: rgba(112, 0, 255, 0.15);
    --bg-gradient-2: rgba(0, 240, 255, 0.15);
}

/* =========================================
   RESET & BASE
========================================= */
* { 
    box-sizing: border-box; 
    margin: 0; 
    padding: 0; 
}

body {
    font-family: var(--font-main);
    background-color: var(--bg-color);
    color: var(--text-color);
    height: 100vh;
    display: flex;
    overflow: hidden;
    
    /* Effet d'arrière-plan ambiant cyberpunk */
    background-image: radial-gradient(circle at top left, var(--bg-gradient-1), transparent 40%),
                      radial-gradient(circle at bottom right, var(--bg-gradient-2), transparent 40%);
}

.app-container { 
    display: flex; 
    width: 100%; 
    height: 100%; 
}

/* =========================================
   SIDEBAR (MENU LATÉRAL)
========================================= */
.sidebar {
    width: 420px;
    background: var(--container-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    padding: 25px;
    display: flex;
    flex-direction: column;
    border-right: 1px solid var(--border-color);
    box-shadow: 5px 0 25px rgba(0,0,0,0.5);
    z-index: 10;
}

.sidebar h2 { 
    margin-bottom: 20px; 
    font-family: var(--font-heading);
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    background: linear-gradient(to right, var(--text-color), var(--active-border-color));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* Scrollbar personnalisée style néon */
#elementList::-webkit-scrollbar { width: 6px; }
#elementList::-webkit-scrollbar-track { background: rgba(255, 255, 255, 0.05); border-radius: 4px; }
#elementList::-webkit-scrollbar-thumb { background: var(--border-color); border-radius: 4px; }
#elementList::-webkit-scrollbar-thumb:hover { background: var(--active-border-color); }

/* =========================================
   CARTES & PARAMÈTRES (GLASSMORPHISM)
========================================= */
.grid-settings, .elem-card, .controls-help {
    background: var(--container-bg);
    border: 1px solid var(--border-color);
    padding: 15px; 
    border-radius: 12px;
    margin-bottom: 15px; 
    font-size: 0.9rem;
    box-shadow: inset 0 0 10px rgba(0, 240, 255, 0.05);
    transition: all 0.3s ease;
}

.elem-card:hover {
    border-color: var(--active-border-color);
    box-shadow: var(--shadow-neon);
}

/* Bordure colorée spécifique générée par JS */
.elem-card { border-left-width: 5px; }

#elementList {
    flex-grow: 1; 
    overflow-y: auto; 
    display: flex;
    flex-direction: column; 
    gap: 15px; 
    margin-bottom: 15px; 
    padding-right: 10px;
}

.row { display: flex; align-items: center; gap: 10px; margin-top: 5px; }
.func-prefix { font-family: 'Courier New', Courier, monospace; font-weight: bold; color: var(--active-border-color); }

/* =========================================
   INPUTS (CHAMPS DE TEXTE)
========================================= */
input[type="text"] {
    background: rgba(0, 0, 0, 0.3); 
    border: 1px solid var(--border-color); 
    color: var(--text-color);
    border-radius: 6px; 
    padding: 8px; 
    font-family: monospace;
    font-size: 1rem; 
    outline: none;
    transition: all 0.3s ease;
}

input[type="text"]:focus { 
    border-color: var(--active-border-color); 
    box-shadow: 0 0 10px var(--active-border-color);
    background: rgba(0, 240, 255, 0.05);
}

.input-math { flex-grow: 1; width: 100%; }
.input-bound { width: 75px; text-align: center; }
input[type="checkbox"] { width: 18px; height: 18px; cursor: pointer; accent-color: var(--active-border-color); }

/* Sélecteur de couleur */
input[type="color"] {
    -webkit-appearance: none; border: 1px solid var(--border-color); width: 35px; height: 35px;
    border-radius: 6px; padding: 0; cursor: pointer; background: transparent;
}
input[type="color"]::-webkit-color-swatch-wrapper { padding: 2px; }
input[type="color"]::-webkit-color-swatch { border: none; border-radius: 4px; }

/* =========================================
   INTÉGRALES
========================================= */
.integrals-container { display: flex; flex-direction: column; gap: 8px; margin-top: 5px;}
.integral-row {
    display: flex; align-items: center; gap: 8px; 
    background: rgba(0, 0, 0, 0.4);
    border: 1px solid rgba(255,255,255,0.1);
    padding: 8px; border-radius: 6px; font-size: 0.9rem;
}

/* =========================================
   BOUTONS CYBERPUNK
========================================= */
button { 
    font-family: var(--font-heading);
    cursor: pointer; 
    font-weight: 600; 
    letter-spacing: 0.5px;
    transition: all 0.3s ease; 
    border: 1px solid var(--border-color); 
    border-radius: 8px;
    color: var(--text-color);
    background-color: var(--button-bg);
}

button:hover {
    background-color: var(--button-hover-bg);
    border-color: var(--active-border-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-neon);
}

.delete-btn { background: rgba(255, 0, 127, 0.2); border-color: #ff007f; color: #fff; padding: 6px 12px; }
.delete-btn:hover { background: #ff007f; box-shadow: 0 0 15px #ff007f; border-color: #fff; }

.add-integral-btn { padding: 8px; font-size: 0.85rem; width: 100%; margin-top: 8px; }

.add-buttons { display: flex; gap: 12px; margin-bottom: 15px; }
.add-btn { padding: 12px; font-size: 1rem; flex: 1; text-transform: uppercase; }

.func-btn { background-color: rgba(57, 255, 20, 0.1); border-color: #39ff14; }
.func-btn:hover { background-color: rgba(57, 255, 20, 0.3); box-shadow: 0 0 15px #39ff14; }

.point-btn { background-color: rgba(0, 240, 255, 0.1); border-color: #00f0ff; }
.point-btn:hover { background-color: rgba(0, 240, 255, 0.3); box-shadow: 0 0 15px #00f0ff; }

#recenterBtn { margin-top: 10px; padding: 12px; width: 100%; text-transform: uppercase; }

.export-btn { 
    background-color: rgba(112, 0, 255, 0.2); 
    border-color: #b92b27;
    margin-top: 10px; padding: 12px; width: 100%; 
    text-transform: uppercase;
}
.export-btn:hover {
    background-color: rgba(112, 0, 255, 0.5);
    box-shadow: 0 0 15px rgba(112, 0, 255, 0.8);
}

.controls-help p { margin-bottom: 8px; opacity: 0.8; }
code { color: var(--active-border-color); font-weight: bold; }

/* =========================================
   CANVAS & TOOLTIP
========================================= */
.canvas-container { 
    flex-grow: 1; 
    position: relative; 
    cursor: crosshair; 
}
.canvas-container:active { cursor: grabbing; }
canvas { display: block; width: 100%; height: 100%; }

.tooltip {
    position: absolute; 
    background: var(--container-bg); 
    backdrop-filter: var(--glass-blur);
    color: var(--text-color);
    padding: 8px 12px; 
    border-radius: 8px; 
    font-family: monospace;
    font-size: 1.1rem;
    pointer-events: none; 
    transform: translate(-50%, -150%);
    display: none; 
    border: 1px solid var(--active-border-color); 
    z-index: 20;
    box-shadow: var(--shadow-neon);
}