/* --- VARIABLES (Thème Unifié avec l'Accueil) --- */
:root {
    --primary: #4f46e5;       /* Indigo 600 (Couleur principale de l'accueil) */
    --primary-soft: rgba(79, 70, 229, 0.1);
    --primary-glow: rgba(79, 70, 229, 0.4);
    --bg-deep: #0f172a;       /* Slate 900 (Fond sombre de l'accueil) */
    --bg-card: rgba(30, 41, 59, 0.85); /* Slate 800 avec transparence */
    --border: #334155;        /* Slate 700 */
    --text-white: #f8fafc;
    --text-muted: #94a3b8;
    --input-bg: rgba(15, 23, 42, 0.6);
    --radius: 12px;
}

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

body {
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: var(--bg-deep);
    background-image: radial-gradient(circle at 50% 0%, #1e1b4b 0%, transparent 50%);
    font-family: 'Rajdhani', sans-serif;
    color: var(--text-white);
    overflow: hidden;
    position: relative;
}

/* --- ANIMATION DES COMÈTES (Importée de l'accueil) --- */
body::before, body::after {
    content: '';
    position: absolute;
    height: 2px;
    background: linear-gradient(to right, #ffffff, var(--primary), transparent);
    border-radius: 100px 0 0 100px;
    z-index: 0;
    opacity: 0;
    pointer-events: none; /* Empêche les comètes de bloquer les clics */
}

/* Vague 1 (Très rapides) */
body::before {
    top: 10%;
    right: -10%;
    width: 250px;
    box-shadow:
            0 0 15px 2px rgba(79, 70, 229, 0.8),
            300px -150px 0 -1px rgba(255, 255, 255, 0.4),
            600px 100px 0 0 rgba(79, 70, 229, 0.6);
    animation: comet-fall 2s linear infinite;
}

/* Vague 2 (Plus lentes et floues pour la profondeur) */
body::after {
    top: -20%;
    right: 20%;
    width: 150px;
    box-shadow:
            0 0 10px 1px rgba(79, 70, 229, 0.5),
            400px -250px 0 0 rgba(255, 255, 255, 0.3);
    filter: blur(1px);
    animation: comet-fall 3s linear infinite;
    animation-delay: 0.8s;
}

@keyframes comet-fall {
    0% { transform: translate(300px, -300px) rotate(-45deg); opacity: 0; }
    5% { opacity: 1; }
    40% { transform: translate(-1800px, 1800px) rotate(-45deg); opacity: 0; }
    100% { transform: translate(-1800px, 1800px) rotate(-45deg); opacity: 0; }
}

/* --- BOITE DE CONNEXION --- */
.login-container {
    position: relative;
    z-index: 10; /* S'assure que la boîte est au-dessus des comètes */
    width: 100%;
    display: flex;
    justify-content: center;
    padding: 20px;
}

.login-box {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: 50px 45px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    box-shadow:
            0 20px 50px rgba(0, 0, 0, 0.7),
            inset 0 0 20px rgba(79, 70, 229, 0.05);
    text-align: center;
    width: 100%;
    max-width: 420px;
    animation: bootUp 0.8s cubic-bezier(0.1, 0.8, 0.1, 1) forwards;
    position: relative;
}

/* Décoration haut de box (Ligne Indigo) */
.header-decoration {
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 4px;
    background: linear-gradient(90deg, transparent, var(--primary), transparent);
    box-shadow: 0 0 15px var(--primary);
    border-radius: var(--radius) var(--radius) 0 0;
}

h2 {
    color: var(--text-white);
    margin: 0 0 5px 0;
    font-size: 38px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 4px;
    text-shadow: 0 0 15px var(--primary-glow);
}

.sub-title {
    color: var(--text-muted);
    font-size: 13px;
    margin-bottom: 40px;
    text-transform: uppercase;
    letter-spacing: 2px;
    font-weight: 600;
}

/* --- CHAMPS DE FORMULAIRE --- */
form {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.input-group {
    position: relative;
}

.input-group i {
    position: absolute;
    left: 20px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    transition: 0.3s;
    font-size: 18px;
    z-index: 2;
}

input {
    width: 100%;
    padding: 18px 20px 18px 55px;
    background: var(--input-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-white);
    font-size: 16px;
    font-family: 'Rajdhani', sans-serif;
    font-weight: 600;
    letter-spacing: 1px;
    transition: all 0.3s ease;
    position: relative;
    z-index: 1;
}

input::placeholder {
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1.5px;
    font-size: 14px;
}

/* Ligne lumineuse sous l'input focus */
.input-highlight {
    position: absolute;
    bottom: 0; left: 0;
    width: 0%; height: 2px;
    background: var(--primary);
    transition: width 0.4s ease;
    z-index: 3;
    border-radius: 0 0 8px 8px;
}

input:focus {
    outline: none;
    border-color: rgba(79, 70, 229, 0.5);
    background: rgba(15, 23, 42, 0.9);
    box-shadow: inset 0 0 10px rgba(79, 70, 229, 0.1);
}

input:focus ~ .input-highlight {
    width: 100%;
}

input:focus ~ i {
    color: var(--primary);
    text-shadow: 0 0 10px var(--primary-glow);
}

/* --- BOUTON DE CONNEXION --- */
button {
    width: 100%;
    padding: 18px;
    margin-top: 10px;
    background: var(--primary-soft);
    color: #fff;
    border: 1px solid var(--primary);
    border-radius: 8px;
    font-weight: 700;
    font-size: 16px;
    letter-spacing: 3px;
    cursor: pointer;
    transition: all 0.3s;
    text-transform: uppercase;
    font-family: 'Rajdhani', sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
    position: relative;
    overflow: hidden;
}

button::before {
    content: '';
    position: absolute;
    top: 0; left: -100%;
    width: 100%; height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s;
}

button:hover {
    background: var(--primary);
    box-shadow: 0 0 20px var(--primary-glow);
    transform: translateY(-2px);
}

button:hover::before {
    left: 100%;
}

button:active {
    transform: scale(0.98);
}

/* --- RETOUR AU HUB --- */
.btn-back {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-top: 35px;
    color: var(--text-muted);
    text-decoration: none;
    font-size: 14px;
    font-weight: 600;
    transition: 0.3s;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.btn-back:hover {
    color: var(--text-white);
    text-shadow: 0 0 8px rgba(255,255,255,0.5);
}

/* --- ALERTES (ERREURS) --- */
.error {
    background: rgba(239, 68, 68, 0.1);
    color: #ef4444; /* Rouge erreur doux */
    font-size: 14px;
    padding: 15px;
    border: 1px solid rgba(239, 68, 68, 0.3);
    border-radius: 8px;
    border-left: 4px solid #ef4444;
    margin-bottom: 25px;
    display: flex;
    align-items: center;
    gap: 12px;
    animation: glitchShake 0.4s ease-in-out;
    font-weight: 600;
    text-align: left;
    letter-spacing: 0.5px;
}

/* --- ANIMATIONS --- */
@keyframes bootUp {
    0% { opacity: 0; transform: scale(0.95) translateY(20px); filter: blur(10px); }
    100% { opacity: 1; transform: scale(1) translateY(0); filter: blur(0); }
}

@keyframes glitchShake {
    0%, 100% { transform: translateX(0); }
    20% { transform: translateX(-4px) skewX(2deg); }
    40% { transform: translateX(4px) skewX(-2deg); }
    60% { transform: translateX(-2px); }
    80% { transform: translateX(2px); }
}