:root { --bg: #0f172a; --card: #1e293b; --text: #ffffff; --accent: #38bdf8; }
        body { font-family: system-ui, sans-serif; background: var --bg; color: var --text; display: flex; justify-content: center; padding: 20px; margin: 0; }
        .container { max-width: 600px; width: 100%; }
        h1 { text-align: center; color: var --accent; }
        textarea { width: 100%; padding: 15px; border-radius: 8px; border: 1px solid var --accent; background: var --card; color: rgb(0, 0, 0); font-size: 18px; box-sizing: border-box; }
        .result-card { background: var --card; padding: 15px; margin-top: 15px; border-radius: 8px; display: flex; justify-content: space-between; align-items: center; }
        .result-text { font-size: 1.2rem; word-break: break-all; }
        button { background: var --accent; border: none; padding: 8px 15px; border-radius: 5px; cursor: pointer; font-weight: bold; }
        footer { margin-top: 40px; font-size: 0.8rem; opacity: 0.6; line-height: 1.6; }
        .seo-content { margin-top: 50px; border-top: 1px solid var(--accent); padding-top: 20px; opacity: 0.9; }
    .seo-content h2 { font-size: 1.5rem; color: var(--accent); margin-bottom: 20px; }
    .faq-item { margin-bottom: 25px; }
    .faq-item h3 { font-size: 1.1rem; color: var(--text); margin-bottom: 8px; }
    .faq-item p { font-size: 0.95rem; line-height: 1.6; color: #cbd5e1; }
    /* Variables para el cambio de tema */
:root { 
    --bg: #0f172a; 
    --card: #1e293b; 
    --text: #f8fafc; 
    --accent: #38bdf8; 
}

/* Esta clase se activa con el botón */
body.light-mode {
    --bg: #f1f5f9;
    --card: #ffffff;
    --text: #1e293b;
    --accent: #0284c7;
}

body { 
    background-color: var(--bg); /* ¡ESTO ES LO MÁS IMPORTANTE! */
    color: var(--text); 
    font-family: system-ui, sans-serif;
    display: flex; 
    justify-content: center; 
    padding: 20px; 
    margin: 0; 
    min-height: 100vh;
    transition: background-color 0.3s, color 0.3s; 
}

.container { max-width: 600px; width: 100%; }

h1 { text-align: center; color: var(--accent); }

textarea { 
    width: 100%; 
    padding: 15px; 
    border-radius: 8px; 
    border: 1px solid var(--accent); 
    background-color: var(--card); 
    color: var(--text); 
    font-size: 18px; 
    box-sizing: border-box; 
}

.result-card { 
    background-color: var(--card); 
    padding: 15px; 
    margin-top: 15px; 
    border-radius: 8px; 
    display: flex; 
    justify-content: space-between; 
    align-items: center;
    border: 1px solid rgba(128, 128, 128, 0.1);
}

.theme-toggle {
    position: absolute;
    top: 20px;
    right: 20px;
    background: var(--card);
    border: 1px solid var(--accent);
    color: var(--text);
    padding: 8px 12px;
    border-radius: 20px;
    cursor: pointer;
    font-size: 1rem;
    z-index: 100;
}

/* Estilos SEO */
.seo-content { margin-top: 30px; }
.faq-item h3 { color: var(--accent); }
/* Notificación Toast */
.toast {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%) translateY(100px); /* Escondido abajo */
    background: var(--accent);
    color: #fff;
    padding: 12px 24px;
    border-radius: 30px;
    font-weight: bold;
    box-shadow: 0 4px 15px rgba(0,0,0,0.3);
    transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    z-index: 1000;
}

.toast.show {
    transform: translateX(-50%) translateY(0); /* Sube a la pantalla */
}
.decorations { margin-top: 30px; text-align: center; }
.symbol-grid { 
    display: grid; 
    grid-template-columns: repeat(5, 1fr); 
    gap: 10px; 
    margin-top: 15px; 
}
.symbol-grid button {
    background: var(--card);
    border: 1px solid var(--accent);
    color: var(--text);
    padding: 10px;
    font-size: 1.2rem;
    border-radius: 8px;
    cursor: pointer;
    transition: 0.2s;
}
.symbol-grid button:hover { background: var(--accent); color: white; }